/* roulang page: index */
:root {
      --color-brand: #1478BC;
      --color-brand-dark: #0D5A94;
      --color-brand-light: #EDF6FB;
      --color-brand-border: #D6E5EF;
      --color-coral: #F06440;
      --color-coral-light: #FDEFEB;
      --color-success: #2F9B6A;
      --color-success-light: #EAF6F0;
      --color-warning: #C8871A;
      --color-deep: #0F2B43;
      --color-body: #F7FAFE;
      --color-card: #FFFFFF;
      --color-text: #1C3B52;
      --color-text-secondary: #4B647A;
      --color-text-muted: #7C92A5;
      --color-border: #E6EDF3;
      --radius-card: 16px;
      --radius-btn: 9px;
      --shadow-card: 0 2px 10px rgba(18,57,90,0.06);
      --shadow-hover: 0 14px 28px rgba(18,57,90,0.12);
      --spacing-section: 96px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
      font-family: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",-apple-system,sans-serif;
      font-size: 16px;
      line-height: 1.8;
      color: var(--color-text);
      background-color: var(--color-body);
      -webkit-font-smoothing: antialiased;
  }
  a { text-decoration: none; color: inherit; }
  img { max-width: 100%; display: block; }
  input, button, textarea, select { font-family: inherit; font-size: 100%; outline: none; }
  ul, ol { list-style: none; }

  body.no-scroll { overflow: hidden; }
  .container-site {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
  }
  @media (min-width: 640px) {
      .container-site { padding-left: 32px; padding-right: 32px; }
  }

  .site-nav {
      height: 76px;
      background: rgba(255,255,255,0.96);
      box-shadow: 0 1px 0 rgba(221,233,242,0.9);
      position: sticky;
      top: 0;
      z-index: 100;
  }
  .site-nav .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      gap: 16px;
  }
  .logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
  }
  .logo-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: var(--color-brand);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      letter-spacing: 0;
      flex-shrink: 0;
  }
  .logo-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--color-text);
      letter-spacing: .5px;
      line-height: 1.2;
      white-space: nowrap;
  }
  .logo-text span { color: var(--color-brand); }
  .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: auto;
  }
  .nav-links a.nav-item {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: #566f85;
      border-radius: 8px;
      transition: color .2s, background .2s;
      position: relative;
      white-space: nowrap;
  }
  .nav-links a.nav-item:hover {
      color: var(--color-brand);
      background: rgba(20,120,188,.06);
  }
  .nav-links a.nav-item.active {
      color: var(--color-brand);
      font-weight: 700;
      background: rgba(20,120,188,.08);
  }
  .nav-links a.nav-item.active::after {
      content: "";
      position: absolute;
      left: 14px;
      right: 14px;
      bottom: 4px;
      height: 3px;
      border-radius: 4px 4px 0 0;
      background: var(--color-brand);
  }
  .nav-divider {
      width: 1px;
      height: 24px;
      background: #dbe5ed;
      margin: 0 12px;
  }
  .nav-login-btn {
      display: inline-flex;
      align-items: center;
      height: 40px;
      padding: 0 18px;
      background: var(--color-brand);
      color: #fff;
      font-weight: 600;
      font-size: 14px;
      border-radius: 9px;
      transition: all .2s;
      box-shadow: 0 2px 8px rgba(20,120,188,.18);
      border: none;
      cursor: pointer;
      white-space: nowrap;
  }
  .nav-login-btn:hover {
      background: var(--color-brand-dark);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(20,120,188,.22);
  }
  .nav-login-btn:active { transform: translateY(0);
      box-shadow: 0 2px 8px rgba(20,120,188,.18); }
  .mobile-menu-btn {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid #d6e5ef;
      border-radius: 10px;
      background: #fff;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      flex-shrink: 0;
  }
  .mobile-menu-btn svg { width: 22px;
      height: 22px;
      stroke: var(--color-text); }

  .mobile-nav {
      display: none;
      position: fixed;
      z-index: 99;
      top: 0;
      left: 0;
      right: 0;
      background: #fff;
      padding: 90px 24px 32px;
      box-shadow: 0 18px 40px rgba(12,40,70,.16);
      border-bottom: 1px solid #eee;
      max-height: 100vh;
      overflow-y: auto;
  }
  .mobile-nav.open { display: block; }
  .mobile-nav a {
      display: block;
      padding: 16px 0;
      font-size: 17px;
      font-weight: 600;
      color: var(--color-text);
      border-bottom: 1px solid #eef3f6;
  }
  .mobile-nav a:last-child { border-bottom: none; }
  .mobile-nav a.active { color: var(--color-brand); }

  .section-space { padding: var(--spacing-section) 0; }
  .section-sm { padding: 56px 0; }
  .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--color-brand-light);
      color: var(--color-brand);
      font-size: 13px;
      font-weight: 600;
      padding: 5px 14px;
      border-radius: 40px;
      letter-spacing: .4px;
  }
  .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--color-text);
      line-height: 1.35;
      letter-spacing: -.3px;
  }
  .section-subtitle {
      font-size: 17px;
      color: var(--color-text-secondary);
      line-height: 1.8;
      margin-top: 12px;
  }
  .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      height: 48px;
      padding: 0 26px;
      background: var(--color-brand);
      color: #fff;
      font-weight: 600;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all .22s;
      box-shadow: 0 2px 10px rgba(20,120,188,.16);
      font-size: 15px;
  }
  .btn-main:hover {
      background: var(--color-brand-dark);
      transform: translateY(-2px);
      box-shadow: 0 9px 18px rgba(20,120,188,.2);
  }
  .btn-main:active { transform: translateY(0);
      box-shadow: 0 2px 8px rgba(20,120,188,.18); }
  .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      height: 48px;
      padding: 0 26px;
      background: transparent;
      color: var(--color-brand);
      border: 1.5px solid var(--color-brand);
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all .2s;
      cursor: pointer;
      font-size: 15px;
  }
  .btn-outline:hover {
      background: var(--color-brand-light);
      border-color: var(--color-brand-dark);
      color: var(--color-brand-dark);
  }
  .btn-white-solid {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      height: 48px;
      padding: 0 28px;
      background: #fff;
      color: var(--color-brand);
      font-weight: 700;
      border-radius: var(--radius-btn);
      transition: all .22s;
      cursor: pointer;
      border: none;
      font-size: 15px;
  }
  .btn-white-solid:hover {
      transform: translateY(-2px);
      background: var(--color-brand-light);
  }
  .btn:focus-visible, a:focus-visible, input:focus-visible {
      outline: 3px solid rgba(20,120,188,.35);
      outline-offset: 2px;
  }

  .card-standard {
      background: var(--color-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid rgba(230,237,243,.8);
      transition: all .25s;
  }
  .card-standard:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
  }
  .text-gradient { background: linear-gradient(135deg,#0d5a94,#3f9fd8); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
  .badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 12px;
      font-weight: 600;
      padding: 3px 10px;
      border-radius: 20px;
      background: var(--color-brand-light);
      color: var(--color-brand);
  }
  .badge-coral { background: var(--color-coral-light); color: var(--color-coral); }
  .badge-green { background: var(--color-success-light); color: var(--color-success); }

  .hero-section {
      position: relative;
      background: var(--color-body);
      overflow: hidden;
      padding: 78px 0 96px;
  }
  .hero-section::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      background-repeat: no-repeat;
      opacity: .2;
      z-index: 0;
  }
  .hero-section::after {
      content: "";
      position: absolute;
      top: -60px;
      right: -100px;
      width: 460px;
      height: 460px;
      border-radius: 50%;
      background: rgba(20,120,188,.08);
      z-index: 0;
  }
  .hero-inner { position: relative; z-index: 1; }
  .hero-title {
      font-size: clamp(32px,4.4vw,46px);
      font-weight: 800;
      line-height: 1.35;
      letter-spacing: -1px;
      color: var(--color-text);
  }
  .hero-subtitle {
      font-size: 17px;
      line-height: 2;
      color: var(--color-text-secondary);
      margin-top: 20px;
      max-width: 520px;
  }
  .login-card {
      background: #fff;
      border-radius: 20px;
      box-shadow: 0 18px 45px rgba(28,59,82,.14);
      padding: 30px;
      border-top: 4px solid var(--color-brand);
      width: 100%;
      max-width: 400px;
  }
  .form-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--color-text);
      display: block;
      margin-bottom: 6px;
  }
  .form-input {
      width: 100%;
      height: 46px;
      background: #FAFCFF;
      border: 1px solid #c9d9e6;
      border-radius: 9px;
      padding: 0 15px;
      font-size: 15px;
      color: var(--color-text);
      transition: all .2s;
  }
  .form-input:focus {
      border-color: var(--color-brand);
      box-shadow: 0 0 0 3px rgba(20,120,188,.15);
      background: #fff;
  }
  .form-input::placeholder { color: #A8BCCD; }
  .security-tip {
      display: flex;
      align-items: center;
      gap: 8px;
      background: var(--color-brand-light);
      border-radius: 10px;
      padding: 10px 12px;
      font-size: 12px;
      color: var(--color-brand);
      margin-top: 16px;
  }
  .stat-item .stat-number {
      font-size: clamp(32px,4vw,42px);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -.5px;
      color: var(--color-brand);
  }
  .stat-item .stat-label { color: var(--color-text-secondary); font-size: 14px; margin-top: 6px; }

  .cmp-table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      border-radius: 18px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      background: #fff;
      border: 1px solid #e7edf3;
  }
  .cmp-table th, .cmp-table td {
      padding: 16px 18px;
      text-align: center;
      font-size: 14px;
      border-bottom: 1px solid #edf2f6;
  }
  .cmp-table th { background: #f4f9fd; font-weight: 700; }
  .cmp-table td:first-child { text-align: left; font-weight: 600; }
  .cmp-table .hot-col { background: #eef6fd; border-left: 1px solid #dcebf5; border-right: 1px solid #dcebf5; }
  .cmp-table .thead-hot { background: var(--color-brand); color: #fff; }
  .cmp-table .thead-hot small { display: block; font-size: 12px; opacity: .85; font-weight: 400; margin-top: 4px; }
  .cmp-table tr:last-child td { border-bottom: none; }
  .cmp-table .icon-true { color: var(--color-success); font-weight: 800; }
  .cmp-table .icon-false { color: #a9bdce; font-weight: 800; }
  .cmp-table .icon-limit { color: var(--color-warning); font-size: 13px; font-weight: 600; }
  .cmp-table .highlight-row { background: #f7fcff; }

  .benefit-item {
      display: grid;
      grid-template-columns: 1fr;
      gap: 24px;
      align-items: center;
  }
  @media (min-width: 1024px) {
      .benefit-item { grid-template-columns: 1fr 1fr; }
      .benefit-item.alternate .benefit-media { order: 2; }
      .benefit-item.alternate .benefit-content { order: 1; }
  }
  .benefit-media {
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 12px 30px rgba(18,57,90,.12);
  }
  .benefit-media img {
      width: 100%;
      height: 100%;
      min-height: 240px;
      object-fit: cover;
  }
  .level-tag {
      display: inline-flex;
      align-items: center;
      background: var(--color-brand);
      color: #fff;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 800;
      padding: 4px 12px;
      letter-spacing: .6px;
  }
  .level-tag.coral { background: var(--color-coral); }
  .level-tag.deep { background: var(--color-deep); }

  .lock-card {
      position: relative;
      background: #fff;
      border-radius: 18px;
      overflow: hidden;
      transition: all .25s;
      box-shadow: 0 2px 10px rgba(18,57,90,.06);
      border: 1px solid #edf2f7;
      height: 100%;
      display: flex;
      flex-direction: column;
  }
  .lock-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 14px 28px rgba(18,57,90,.12);
  }
  .lock-card .cover-ratio {
      aspect-ratio: 16 / 9;
      overflow: hidden;
      position: relative;
  }
  .lock-card .cover-ratio img { width: 100%; height: 100%; object-fit: cover; }
  .lock-mask {
      position: absolute;
      inset: 0;
      background: rgba(28,59,82,.36);
      display: flex;
      align-items: center;
      justify-content: center;
      backdrop-filter: none;
  }
  .lock-icon {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: rgba(255,255,255,.92);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: var(--color-brand-dark);
      box-shadow: 0 4px 12px rgba(0,0,0,.12);
  }
  .content-card-body { padding: 16px 18px 18px; display: flex;
      flex-direction: column;
      gap: 10px;
      flex: 1; }
  .lock-tag {
      display: inline-block;
      background: #f2f7fb;
      color: #4b647a;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 14px;
  }
  .unlock-line {
      border-top: 1px dashed #dfe9f0;
      padding-top: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-top: auto;
      font-size: 13px;
      color: var(--color-brand);
      font-weight: 600;
  }
  .premium-slider::-webkit-scrollbar { display: none; }

  .news-feature {
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(18,57,90,.08);
      background: #fff;
      height: 100%;
      border: 1px solid #eef2f7;
      transition: all .3s;
  }
  .news-feature:hover { box-shadow: 0 14px 28px rgba(18,57,90,.12); }
  .news-list-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      background: #fff;
      border-radius: 14px;
      padding: 15px 20px;
      box-shadow: 0 1px 4px rgba(18,57,90,.04);
      border: 1px solid #eef2f7;
      transition: all .22s;
  }
  .news-list-item:hover {
      border-color: #d6e5ef;
      box-shadow: 0 8px 18px rgba(18,57,90,.08);
      transform: translateX(4px);
  }
  .news-list-item .news-title {
      font-size: 15px;
      font-weight: 600;
      color: var(--color-text);
      line-height: 1.6;
      transition: color .2s;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
  }
  .news-list-item:hover .news-title { color: var(--color-brand); }
  .news-date { color: var(--color-text-muted); font-size: 13px; flex-shrink: 0; }

  .faq-item {
      background: #fff;
      border: 1px solid #e8eef4;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 1px 4px rgba(18,57,90,.03);
      transition: all .2s;
  }
  .faq-item + .faq-item { margin-top: 14px; }
  .faq-q {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 20px 22px;
      cursor: pointer;
      min-height: 60px;
      user-select: none;
  }
  .faq-q .faq-num {
      font-size: 13px;
      font-weight: 800;
      color: var(--color-brand);
      background: var(--color-brand-light);
      padding: 3px 10px;
      border-radius: 6px;
      flex-shrink: 0;
  }
  .faq-q .faq-question {
      flex: 1;
      font-size: 16px;
      font-weight: 700;
      line-height: 1.5;
  }
  .faq-q .faq-toggle {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      border: 1.5px solid #d0dfea;
      color: var(--color-brand);
      font-size: 17px;
      font-weight: 400;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all .2s;
      flex-shrink: 0;
      background: #fff;
  }
  .faq-item.active .faq-toggle {
      background: var(--color-brand);
      border-color: var(--color-brand);
      color: #fff;
      transform: rotate(45deg);
  }
  .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height .2s ease;
      color: var(--color-text-secondary);
      font-size: 15px;
      line-height: 1.9;
      padding: 0 22px;
  }
  .faq-item.active .faq-a {
      max-height: 500px;
      padding: 0 22px 20px;
  }

  .cta-block {
      background: var(--color-deep);
      border-radius: 24px;
      padding: 44px 38px;
      position: relative;
      overflow: hidden;
  }
  .cta-block::after {
      content: "";
      position: absolute;
      right: -40px;
      top: -40px;
      width: 200px;
      height: 200px;
      border-radius: 50%;
      background: rgba(20,120,188,.22);
  }
  .cta-title {
      font-size: 26px;
      font-weight: 800;
      color: #fff;
      line-height: 1.4;
  }
  .cta-desc {
      color: rgba(255,255,255,.72);
      font-size: 15px;
      margin-top: 8px;
      max-width: 500px;
      line-height: 1.8;
  }

  .footer-area {
      background: var(--color-deep);
      color: #9fb4c7;
      padding: 50px 0 0;
  }
  .footer-cols {
      display: grid;
      grid-template-columns: 1fr;
      gap: 40px;
  }
  @media (min-width: 640px) {
      .footer-cols { grid-template-columns: 1fr 1fr; }
  }
  @media (min-width: 992px) {
      .footer-cols { grid-template-columns: 2.2fr 1fr 1fr 1.5fr; }
  }
  .footer-title {
      font-size: 14px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 18px;
      letter-spacing: .4px;
  }
  .footer-links a {
      display: block;
      padding: 5px 0;
      color: #9fb4c7;
      font-size: 14px;
      transition: color .2s;
  }
  .footer-links a:hover { color: #7cc5f0; }
  .footer-bottom {
      margin-top: 40px;
      border-top: 1px solid rgba(255,255,255,.12);
      padding: 20px 0;
      font-size: 13px;
      text-align: center;
  }

  .form-cta-light input { background: #fff; border-color: transparent; }

  @media (max-width: 1024px) {
      .nav-links { display: none; }
      .nav-login-btn.mobile-hide { display: none; }
      .nav-divider { display: none; }
      .mobile-menu-btn { display: flex; }
      .section-space { --spacing-section: 72px; }
  }
  @media (max-width: 768px) {
      body { font-size: 15px; }
      .section-space { --spacing-section: 56px; }
      .section-title { font-size: 25px; }
      .hero-title { font-size: 30px; line-height: 1.45; }
      .hero-subtitle { font-size: 15px; line-height: 1.9; }
      .benefit-item { grid-template-columns: 1fr; }
      .benefit-item.alternate .benefit-media { order: initial; }
      .cmp-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; box-shadow: inset -12px 0 12px -12px rgba(0,0,0,.05); }
      .cmp-table-wrap table { min-width: 760px; }
      .cta-block { padding: 36px 24px; }
      .news-list-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  }
  @media (max-width: 520px) {
      .container-site { padding-left: 18px; padding-right: 18px; }
      .mobile-nav { padding-left: 18px; padding-right: 18px; }
      .login-card { padding: 24px 20px; }
      .nav-login-btn { padding: 0 12px; font-size: 13px; }
      .btn-main, .btn-outline { padding: 0 18px; }
  }

/* roulang page: category1 */
:root {
        --brand: #1478BC;
        --brand-hover: #0D5A94;
        --brand-bg: #EDF6FB;
        --brand-border: #D6E5EF;
        --orange: #F06440;
        --orange-bg: #FDEFEB;
        --green: #2F9B6A;
        --green-bg: #EAF6F0;
        --amber: #C8871A;
        --page: #F7FAFE;
        --card: #FFFFFF;
        --text: #1C3B52;
        --text2: #4B647A;
        --muted: #7C92A5;
        --line: #E6EDF3;
        --dark: #0F2B43;
        --radius-btn: 10px;
        --radius-card: 16px;
        --shadow-sm: 0 2px 10px rgba(18,57,90,.06);
        --shadow-hover: 0 14px 28px rgba(18,57,90,.12);
    }

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, sans-serif;
        background: var(--page);
        color: var(--text);
        line-height: 1.75;
        -webkit-font-smoothing: antialiased;
    }
    a {
        color: inherit;
        text-decoration: none;
    }
    img {
        display: block;
        max-width: 100%;
    }
    button {
        font-family: inherit;
        border: none;
        background: none;
        cursor: pointer;
    }

    .container-site {
        max-width: 1240px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 24px;
        padding-right: 24px;
    }

    .site-header {
        position: sticky;
        top: 0;
        z-index: 50;
        background: rgba(255,255,255,.98);
        border-bottom: 1px solid var(--line);
        box-shadow: 0 1px 0 rgba(18,57,90,.03);
    }
    .header-inner {
        min-height: 78px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 28px;
    }
    .logo-wrap {
        display: flex;
        align-items: center;
        gap: 12px;
        flex-shrink: 0;
    }
    .logo-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        border-radius: 12px;
        background: var(--brand);
        color: #fff;
        font-size: 21px;
        font-weight: 700;
        box-shadow: 0 6px 16px rgba(20,120,188,.18);
    }
    .logo-text {
        font-size: 20px;
        font-weight: 700;
        line-height: 1.3;
        color: var(--text);
        letter-spacing: .5px;
    }
    .logo-text .accent {
        color: var(--brand);
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 30px;
    }
    .nav-item {
        position: relative;
        display: inline-flex;
        align-items: center;
        font-size: 15px;
        font-weight: 500;
        color: #566F85;
        padding: 27px 0 21px;
        transition: color .2s ease;
    }
    .nav-item:hover {
        color: var(--brand);
    }
    .nav-item.active {
        color: var(--brand);
    }
    .nav-item.active::after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        bottom: 12px;
        height: 3px;
        border-radius: 99px;
        background: var(--brand);
    }
    .header-login-btn {
        flex-shrink: 0;
        margin-left: 6px;
    }
    .nav-toggle {
        display: none;
        width: 44px;
        height: 44px;
        border-radius: 10px;
        border: 1px solid var(--line);
        background: #fff;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
    }
    .nav-toggle span {
        display: block;
        width: 20px;
        height: 2px;
        border-radius: 2px;
        background: var(--text);
        transition: transform .2s ease, opacity .2s ease;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-size: 15px;
        font-weight: 600;
        line-height: 1;
        padding: 14px 24px;
        border-radius: var(--radius-btn);
        transition: all .18s ease;
        outline: none;
        min-height: 46px;
    }
    .btn:focus-visible {
        box-shadow: 0 0 0 4px rgba(20,120,188,.22);
    }
    .btn-primary {
        background: var(--brand);
        color: #fff;
        box-shadow: 0 8px 18px rgba(20,120,188,.18);
    }
    .btn-primary:hover {
        background: var(--brand-hover);
        transform: translateY(-2px);
        box-shadow: 0 14px 24px rgba(20,120,188,.22);
    }
    .btn-primary:active {
        transform: translateY(0);
        box-shadow: none;
    }
    .btn-outline {
        background: #fff;
        color: var(--brand);
        border: 1px solid var(--brand-border);
    }
    .btn-outline:hover {
        background: var(--brand-bg);
        border-color: var(--brand);
    }
    .btn-white {
        background: #fff;
        color: var(--dark);
    }
    .btn-white:hover {
        background: #DFEEF6;
        transform: translateY(-2px);
    }
    .btn-outline-white {
        background: transparent;
        color: #fff;
        border: 1px solid rgba(255,255,255,.45);
    }
    .btn-outline-white:hover {
        background: rgba(255,255,255,.1);
        border-color: rgba(255,255,255,.8);
        transform: translateY(-2px);
    }

    .section-block {
        padding: 96px 0;
    }
    .section-bg-white {
        background: #fff;
    }
    .section-head {
        max-width: 860px;
        margin-bottom: 48px;
    }
    .section-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        font-weight: 600;
        color: var(--brand);
        letter-spacing: 1px;
        margin-bottom: 12px;
    }
    .section-title {
        font-size: 31px;
        line-height: 1.35;
        color: var(--text);
        font-weight: 700;
        letter-spacing: .2px;
    }
    .section-desc {
        margin-top: 16px;
        font-size: 16px;
        color: var(--text2);
        max-width: 800px;
    }

    .page-hero {
        padding: 62px 0 82px;
        background: linear-gradient(120deg, #EDF6FB 0%, #F6FBFE 55%, #FFFFFF 100%);
        border-bottom: 1px solid var(--line);
        overflow: hidden;
    }
    .hero-grid {
        display: grid;
        grid-template-columns: 1.08fr .92fr;
        gap: 58px;
        align-items: center;
    }
    .hero-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        font-weight: 600;
        color: var(--brand);
        background: rgba(255,255,255,.75);
        border: 1px solid #D5E7F3;
        border-radius: 999px;
        padding: 8px 16px;
        margin-bottom: 22px;
    }
    .hero-eyebrow-dot {
        width: 7px;
        height: 7px;
        border-radius: 50%;
        background: var(--orange);
    }
    .hero-h1 {
        font-size: 44px;
        line-height: 1.28;
        color: var(--text);
        font-weight: 700;
        letter-spacing: 1px;
    }
    .hero-lead {
        margin-top: 22px;
        font-size: 17px;
        line-height: 1.9;
        color: var(--text2);
        max-width: 560px;
    }
    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 14px;
        margin-top: 32px;
    }
    .hero-media {
        position: relative;
    }
    .hero-media-card {
        background: rgba(255,255,255,.88);
        border: 1px solid var(--line);
        border-radius: 20px;
        padding: 14px;
        box-shadow: var(--shadow-hover);
    }
    .hero-media-card img {
        width: 100%;
        height: 300px;
        object-fit: cover;
        border-radius: 14px;
    }
    .hero-media-tip {
        display: flex;
        align-items: flex-start;
        gap: 10px;
        margin-top: 12px;
        padding: 12px 14px;
        background: var(--brand-bg);
        border-radius: 12px;
        font-size: 13px;
        color: var(--text2);
    }
    .hero-media-tip strong {
        color: var(--text);
    }

    .quick-stats {
        background: #fff;
        border-bottom: 1px solid var(--line);
    }
    .stat-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
    }
    .stat-item {
        padding: 34px 34px;
        text-align: center;
    }
    .stat-item + .stat-item {
        border-left: 1px solid var(--line);
    }
    .stat-num {
        font-size: 34px;
        line-height: 1.2;
        font-weight: 700;
        color: var(--text);
        letter-spacing: -1px;
        font-variant-numeric: tabular-nums;
    }
    .stat-num span {
        color: var(--brand);
    }
    .stat-label {
        margin-top: 6px;
        font-size: 14px;
        color: var(--muted);
    }

    .feature-layout {
        display: grid;
        grid-template-columns: .88fr 1.42fr;
        gap: 60px;
        align-items: start;
    }
    .feature-copy p {
        color: var(--text2);
        line-height: 1.85;
        margin-top: 20px;
    }
    .feature-copy .btn {
        margin-top: 28px;
    }
    .feature-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    .feature-card {
        background: #fff;
        border: 1px solid var(--line);
        border-radius: var(--radius-card);
        padding: 28px 24px;
        box-shadow: var(--shadow-sm);
        transition: box-shadow .2s ease, transform .2s ease, border-color .2s ease;
    }
    .feature-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
        border-color: #C4D9E9;
    }
    .feature-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        border-radius: 12px;
        font-size: 15px;
        font-weight: 700;
        color: var(--brand);
        background: var(--brand-bg);
    }
    .feature-title {
        font-size: 18px;
        font-weight: 600;
        margin-top: 18px;
        margin-bottom: 8px;
        color: var(--text);
    }
    .feature-text {
        font-size: 14px;
        color: var(--text2);
        line-height: 1.75;
    }

    .step-wrap {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 28px;
        counter-reset: step;
    }
    .step-item {
        position: relative;
        background: #fff;
        border: 1px solid var(--line);
        border-radius: var(--radius-card);
        padding: 30px 24px 28px;
        box-shadow: var(--shadow-sm);
        transition: box-shadow .2s ease, transform .2s ease;
    }
    .step-item:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }
    .step-num {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        border-radius: 50%;
        background: var(--brand-bg);
        color: var(--brand);
        font-size: 17px;
        font-weight: 700;
        margin-bottom: 16px;
    }
    .step-title {
        font-size: 17px;
        font-weight: 600;
        margin-bottom: 8px;
        color: var(--text);
    }
    .step-text {
        font-size: 14px;
        color: var(--text2);
        line-height: 1.7;
    }

    .scene-layout {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 56px;
        align-items: center;
    }
    .scene-media {
        border-radius: 18px;
        overflow: hidden;
        box-shadow: var(--shadow-hover);
    }
    .scene-media img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        min-height: 360px;
    }
    .scene-item {
        display: flex;
        align-items: flex-start;
        gap: 18px;
        padding: 18px 0;
        border-bottom: 1px solid var(--line);
    }
    .scene-marker {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        width: 42px;
        height: 42px;
        border-radius: 12px;
        background: var(--brand-bg);
        color: var(--brand);
        font-size: 14px;
        font-weight: 700;
        margin-top: 2px;
    }
    .scene-title {
        font-size: 17px;
        font-weight: 600;
        color: var(--text);
        margin-bottom: 4px;
    }
    .scene-text {
        font-size: 14px;
        color: var(--text2);
        line-height: 1.7;
    }

    .topic-list {
        border-top: 1px solid var(--line);
    }
    .topic-row {
        display: flex;
        align-items: flex-start;
        gap: 28px;
        justify-content: space-between;
        padding: 28px 4px;
        border-bottom: 1px solid var(--line);
        transition: background-color .2s ease;
    }
    .topic-row:hover {
        background: rgba(20,120,188,.035);
    }
    .topic-no {
        font-size: 16px;
        font-weight: 700;
        color: #B7C9D8;
        min-width: 42px;
        letter-spacing: 1px;
        font-variant-numeric: tabular-nums;
    }
    .topic-main {
        flex: 1;
        max-width: 760px;
    }
    .topic-name {
        font-size: 19px;
        font-weight: 600;
        color: var(--text);
        margin-bottom: 4px;
    }
    .topic-desc {
        font-size: 14px;
        color: var(--text2);
        line-height: 1.7;
    }
    .topic-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--brand);
        font-size: 14px;
        font-weight: 600;
        transition: gap .2s ease;
    }
    .topic-row:hover .topic-link {
        gap: 12px;
    }

    .faq-block {
        max-width: 920px;
        margin-left: auto;
        margin-right: auto;
    }
    .faq-item {
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 14px;
        margin-bottom: 14px;
        padding: 0;
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        transition: box-shadow .2s ease, border-color .2s ease;
    }
    .faq-item.open {
        border-color: #C6DBEA;
        box-shadow: var(--shadow-hover);
    }
    .faq-title {
        margin: 0;
    }
    .faq-toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        width: 100%;
        padding: 22px 24px;
        text-align: left;
        min-height: 64px;
        color: var(--text);
    }
    .faq-q-text {
        display: flex;
        align-items: center;
        gap: 16px;
        font-size: 16px;
        font-weight: 600;
    }
    .faq-q-num {
        color: var(--brand);
        font-size: 13px;
        letter-spacing: 1px;
        font-weight: 700;
    }
    .faq-icon {
        flex-shrink: 0;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 30px;
        height: 30px;
        border-radius: 9px;
        background: var(--brand-bg);
        color: var(--brand);
        font-size: 20px;
        font-weight: 400;
        transition: transform .2s ease, background-color .2s ease;
    }
    .faq-item.open .faq-icon {
        transform: rotate(45deg);
        background: var(--brand);
        color: #fff;
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height .25s ease;
    }
    .faq-item.open .faq-answer {
        max-height: 420px;
    }
    .faq-answer-inner {
        padding: 0 24px 24px;
        border-top: 1px solid var(--line);
        padding-top: 18px;
        color: var(--text2);
        font-size: 15px;
        line-height: 1.85;
    }

    .cta-block {
        background: var(--dark);
        color: #fff;
        border-top: 1px solid rgba(255,255,255,.08);
    }
    .cta-layout {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 36px;
        padding-top: 70px;
        padding-bottom: 70px;
    }
    .cta-title {
        font-size: 28px;
        line-height: 1.4;
        font-weight: 700;
        margin-bottom: 10px;
    }
    .cta-desc {
        color: rgba(255,255,255,.72);
        font-size: 15px;
        max-width: 560px;
    }
    .cta-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 14px;
        flex-shrink: 0;
    }

    .footer-area {
        background: var(--dark);
        color: rgba(255,255,255,.8);
        font-size: 14px;
        line-height: 1.8;
    }
    .footer-cols {
        display: grid;
        grid-template-columns: 1.35fr .9fr 1fr 1.15fr;
        gap: 48px;
        padding: 56px 0 40px;
    }
    .footer-logo {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-bottom: 16px;
    }
    .footer-logo-icon {
        width: 38px;
        height: 38px;
        border-radius: 10px;
        background: #fff;
        color: var(--brand);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 19px;
        font-weight: 700;
    }
    .footer-logo-text {
        font-size: 18px;
        font-weight: 700;
        color: #fff;
    }
    .footer-logo-text span {
        color: #7CC5F0;
    }
    .footer-title {
        color: #fff;
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 16px;
    }
    .footer-links {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .footer-links a {
        color: rgba(255,255,255,.72);
        transition: color .2s ease;
    }
    .footer-links a:hover {
        color: #7CC5F0;
    }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,.1);
        padding: 22px 0;
        color: rgba(255,255,255,.56);
        text-align: center;
        font-size: 13px;
    }

    @media (max-width: 1080px) {
        .hero-grid {
            grid-template-columns: 1fr 1fr;
            gap: 38px;
        }
        .section-block {
            padding: 78px 0;
        }
        .feature-layout {
            grid-template-columns: 1fr;
            gap: 38px;
        }
        .footer-cols {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 860px) {
        .nav-links {
            display: none;
            position: absolute;
            top: calc(100% + 8px);
            left: 16px;
            right: 16px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 16px;
            box-shadow: 0 18px 40px rgba(12,40,70,.16);
            padding: 16px;
            flex-direction: column;
            align-items: stretch;
            gap: 4px;
        }
        .nav-links.nav-open {
            display: flex;
        }
        .nav-item {
            padding: 14px 12px;
            border-radius: 10px;
            font-size: 16px;
        }
        .nav-item.active {
            background: var(--brand-bg);
        }
        .nav-item.active::after {
            display: none;
        }
        .header-login-btn {
            margin: 10px 0 0;
            justify-content: center;
        }
        .nav-toggle {
            display: flex;
        }
        .hero-grid {
            grid-template-columns: 1fr;
        }
        .hero-media {
            order: 2;
        }
        .hero-h1 {
            font-size: 34px;
        }
        .stat-grid {
            grid-template-columns: 1fr 1fr;
        }
        .stat-item {
            padding: 24px 18px;
        }
        .stat-item:nth-child(3) {
            border-left: none;
        }
        .stat-item:nth-child(2),
        .stat-item:nth-child(4) {
            border-left: 1px solid var(--line);
        }
        .stat-item:nth-child(n+3) {
            border-top: 1px solid var(--line);
        }
        .feature-grid {
            grid-template-columns: 1fr 1fr;
        }
        .step-wrap {
            grid-template-columns: 1fr 1fr;
        }
        .scene-layout {
            grid-template-columns: 1fr;
            gap: 34px;
        }
        .scene-media img {
            min-height: 300px;
        }
        .cta-layout {
            flex-direction: column;
            align-items: flex-start;
        }
    }

    @media (max-width: 560px) {
        .container-site {
            padding-left: 18px;
            padding-right: 18px;
        }
        .section-block {
            padding: 56px 0;
        }
        .section-title {
            font-size: 25px;
        }
        .page-hero {
            padding: 44px 0 56px;
        }
        .hero-h1 {
            font-size: 31px;
        }
        .hero-lead {
            font-size: 16px;
        }
        .hero-actions .btn {
            width: 100%;
        }
        .stat-grid {
            grid-template-columns: 1fr 1fr;
        }
        .stat-num {
            font-size: 28px;
        }
        .feature-grid {
            grid-template-columns: 1fr;
        }
        .step-wrap {
            grid-template-columns: 1fr;
        }
        .topic-row {
            flex-direction: column;
            gap: 8px;
        }
        .topic-link {
            margin-top: 8px;
        }
        .cta-buttons .btn {
            width: 100%;
        }
        .footer-cols {
            grid-template-columns: 1fr;
            gap: 30px;
            padding-top: 42px;
        }
    }

/* roulang page: article */
:root {
            --brand: #1478BC;
            --brand-deep: #0D5A94;
            --brand-soft: #EDF6FB;
            --brand-border: #D6E5EF;
            --accent: #F06440;
            --accent-soft: #FDEFEB;
            --success: #2F9B6A;
            --success-soft: #EAF6F0;
            --warn: #C8871A;
            --dark: #0F2B43;
            --bg: #F7FAFE;
            --card: #FFFFFF;
            --text: #1C3B52;
            --text-2: #4B647A;
            --text-3: #7C92A5;
            --line: #E6EDF3;
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 10px rgba(18, 57, 90, 0.06);
            --shadow-md: 0 14px 28px rgba(18, 57, 90, 0.1);
            --shadow-lg: 0 18px 40px rgba(12, 40, 70, 0.14);
            --transition: all .2s ease;
            --container: 1240px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        a {
            color: var(--brand);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--brand-deep);
        }
        button,
        input,
        textarea {
            font-family: inherit;
        }
        .container-site {
            width: min(var(--container), calc(100% - 48px));
            margin: 0 auto;
        }
        .container-narrow {
            width: min(880px, calc(100% - 48px));
            margin: 0 auto;
        }
        .container-wide {
            width: min(1280px, calc(100% - 40px));
            margin: 0 auto;
        }
        .section-space {
            padding: 96px 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            line-height: 1;
            min-height: 46px;
            padding: 0 24px;
            border: 1px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(20, 120, 188, .28);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 8px 18px rgba(20, 120, 188, .18);
        }
        .btn-primary:hover {
            background: var(--brand-deep);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 4px 10px rgba(20, 120, 188, .14);
        }
        .btn-outline {
            background: #fff;
            color: var(--brand);
            border-color: var(--brand-border);
        }
        .btn-outline:hover {
            background: var(--brand-soft);
            color: var(--brand-deep);
            border-color: var(--brand);
        }
        .btn-ghost {
            background: transparent;
            color: var(--brand);
            border-color: rgba(20, 120, 188, .25);
        }
        .btn-ghost:hover {
            background: var(--brand-soft);
            color: var(--brand-deep);
        }
        .btn-sm {
            min-height: 40px;
            padding: 0 18px;
            font-size: 14px;
        }
        .btn-full {
            width: 100%;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            background: var(--brand-soft);
            border: 1px solid rgba(20, 120, 188, .1);
            padding: 4px 12px;
            border-radius: 999px;
            line-height: 1.5;
        }
        .badge-orange {
            color: var(--accent);
            background: var(--accent-soft);
        }
        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 24px;
            margin-bottom: 36px;
        }
        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text);
            margin: 6px 0 0;
            line-height: 1.35;
        }
        .section-eyebrow {
            display: inline-flex;
            gap: 10px;
            align-items: center;
            color: var(--brand);
            font-weight: 600;
            font-size: 14px;
        }
        .section-eyebrow::before {
            content: "";
            width: 24px;
            height: 3px;
            border-radius: 99px;
            background: var(--accent);
        }

        /* ========== header =========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .96);
            border-bottom: 1px solid rgba(230, 237, 243, .9);
            transition: var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 10px 30px rgba(16, 50, 80, .06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 20px;
        }
        .logo-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-mark {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--brand);
            color: #fff;
            border-radius: 10px;
            font-size: 21px;
            font-weight: 700;
            letter-spacing: 0;
        }
        .logo-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.2;
            letter-spacing: .5px;
        }
        .logo-light {
            color: var(--brand);
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-item {
            position: relative;
            display: inline-flex;
            align-items: center;
            min-height: 44px;
            padding: 0 15px;
            color: #566F85;
            font-size: 15px;
            font-weight: 500;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-item:hover {
            color: var(--brand);
            background: rgba(20, 120, 188, .05);
        }
        .nav-item.active {
            color: var(--brand);
            font-weight: 600;
        }
        .nav-item.active::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 3px;
            border-radius: 99px;
            background: var(--brand);
        }
        .nav-divider {
            width: 1px;
            height: 24px;
            background: var(--line);
            display: block;
        }
        .nav-toggle {
            display: none;
            width: 46px;
            height: 46px;
            background: var(--brand-soft);
            border: none;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            gap: 4px;
            flex-direction: column;
            cursor: pointer;
        }
        .nav-toggle span {
            width: 18px;
            height: 2px;
            background: var(--text);
            border-radius: 99px;
            display: block;
            transition: var(--transition);
        }
        body.nav-open .nav-toggle span:nth-child(1) {
            transform: translateY(6px) rotate(45deg);
        }
        body.nav-open .nav-toggle span:nth-child(2) {
            opacity: 0;
        }
        body.nav-open .nav-toggle span:nth-child(3) {
            transform: translateY(-6px) rotate(-45deg);
        }

        /* ========== article hero ========== */
        .article-banner {
            position: relative;
            background-color: var(--brand-soft);
            background-size: cover;
            background-position: center;
            padding: 70px 0 60px;
            overflow: hidden;
        }
        .article-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(247, 250, 254, .94) 42%, rgba(237, 246, 251, .74) 100%);
        }
        .article-banner .container-site {
            position: relative;
            z-index: 2;
            max-width: 920px;
            margin: 0 auto;
        }
        .crumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 14px;
            color: var(--text-3);
            margin-bottom: 22px;
        }
        .crumb a {
            color: var(--text-3);
        }
        .crumb a:hover {
            color: var(--brand);
        }
        .crumb-sep {
            color: var(--line);
            font-style: normal;
        }
        .crumb-current {
            color: var(--text-2);
            max-width: 60%;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .article-hero-title {
            font-size: clamp(30px, 5vw, 42px);
            font-weight: 700;
            line-height: 1.35;
            color: var(--text);
            letter-spacing: .5px;
            margin: 0 0 20px;
        }
        .article-hero-desc {
            font-size: 17px;
            color: var(--text-2);
            max-width: 700px;
            margin: 0;
        }
        .article-hero-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px 24px;
            color: var(--text-2);
            font-size: 14px;
            padding-top: 20px;
            border-top: 1px solid rgba(214, 229, 239, .7);
            margin-top: 18px;
        }
        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }
        .meta-dot {
            width: 5px;
            height: 5px;
            border-radius: 99px;
            background: #B6CDDD;
            display: inline-block;
        }

        /* =========== article layout =========== */
        .article-section {
            padding: 64px 0 90px;
        }
        .article-grid {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 300px;
            gap: 48px;
            align-items: start;
        }
        .article-main-col {
            min-width: 0;
        }
        .article-panel {
            background: var(--card);
            border: 1px solid rgba(230, 237, 243, .8);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: clamp(28px, 5vw, 56px);
            margin-bottom: 34px;
        }
        .typo {
            font-size: 16px;
            line-height: 2;
            color: var(--text);
            word-break: break-word;
        }
        .typo h2,
        .typo h3 {
            position: relative;
            color: var(--text);
            margin: 0 0 18px;
            line-height: 1.45;
            scroll-margin-top: 120px;
        }
        .typo h2 {
            font-size: 26px;
            font-weight: 700;
            margin-top: 54px;
            padding-left: 16px;
        }
        .typo h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: .28em;
            bottom: .28em;
            width: 5px;
            background: var(--brand);
            border-radius: 99px;
        }
        .typo h3 {
            font-size: 21px;
            font-weight: 600;
            margin-top: 40px;
            color: var(--brand-deep);
        }
        .typo p {
            margin: 0 0 22px;
        }
        .typo a {
            color: var(--brand);
            text-decoration: underline;
            text-decoration-color: rgba(20, 120, 188, .25);
            text-underline-offset: 4px;
        }
        .typo ul,
        .typo ol {
            margin: 0 0 24px;
            padding-left: 28px;
        }
        .typo li {
            margin-bottom: 8px;
            padding-left: 6px;
        }
        .typo ul li::marker {
            color: var(--brand);
        }
        .typo img {
            border-radius: 14px;
            box-shadow: var(--shadow-sm);
            margin: 30px auto;
        }
        .typo figure {
            margin: 36px 0;
        }
        .typo figure img {
            margin: 0 0 10px;
        }
        .typo figcaption {
            font-size: 13px;
            color: var(--text-3);
            text-align: center;
            line-height: 1.6;
        }
        .typo blockquote {
            margin: 30px 0;
            padding: 20px 24px;
            background: var(--brand-soft);
            border-left: 4px solid var(--brand);
            border-radius: 0 12px 12px 0;
            color: var(--text-2);
            font-size: 16px;
        }
        .typo blockquote p {
            margin-bottom: 0;
        }
        .typo table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            font-size: 14px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            overflow: hidden;
        }
        .typo th,
        .typo td {
            border-bottom: 1px solid var(--line);
            padding: 12px 14px;
            text-align: left;
        }
        .typo th {
            background: var(--brand-soft);
            color: var(--text);
            font-weight: 600;
        }
        .typo code {
            background: var(--brand-soft);
            border: 1px solid var(--brand-border);
            padding: 2px 7px;
            border-radius: 6px;
            font-size: 14px;
        }
        .article-source {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            border-top: 1px solid var(--line);
            margin-top: 42px;
            padding-top: 26px;
        }
        .tag {
            display: inline-flex;
            align-items: center;
            padding: 5px 14px;
            border-radius: 99px;
            background: var(--brand-soft);
            color: var(--brand);
            font-size: 13px;
            font-weight: 500;
        }

        /* post prev next */
        .post-nav {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            gap: 20px;
            margin-top: 38px;
            border-top: 1px solid var(--line);
            padding-top: 34px;
        }
        .post-nav-box {
            background: #F9FCFE;
            border-radius: var(--radius-md);
            border: 1px solid var(--line);
            padding: 16px 18px;
            min-height: 84px;
        }
        .post-nav-label {
            font-size: 13px;
            color: var(--text-3);
            display: block;
            margin-bottom: 6px;
        }
        .post-nav-text {
            margin: 0;
            color: var(--text-2);
            font-size: 15px;
            font-weight: 500;
        }
        .post-nav-box.next {
            text-align: right;
        }
        .post-nav-box.next .post-nav-label {
            text-align: right;
        }

        .article-aside {
            position: sticky;
            top: 104px;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .aside-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }
        .aside-title {
            font-size: 17px;
            font-weight: 700;
            margin: 0 0 18px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
            line-height: 1.4;
        }
        .aside-title::before {
            content: "";
            width: 4px;
            height: 18px;
            background: var(--accent);
            border-radius: 99px;
        }
        .toc-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            border-left: 1px solid var(--line);
        }
        .toc-nav a {
            color: var(--text-2);
            padding: 8px 14px;
            font-size: 14px;
            line-height: 1.5;
            border-left: 2px solid transparent;
            margin-left: -1px;
            transition: var(--transition);
        }
        .toc-nav a:hover,
        .toc-nav a:focus {
            color: var(--brand);
            border-left-color: var(--brand);
            background: var(--brand-soft);
        }
        .toc-nav a.sub {
            padding-left: 26px;
            color: var(--text-3);
            font-size: 13.5px;
        }
        .toc-empty {
            color: var(--text-3);
            font-size: 14px;
            padding: 4px 0;
        }
        .aside-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 10px 0 8px;
            color: var(--text);
            line-height: 1.5;
        }
        .aside-card p {
            color: var(--text-2);
            font-size: 14px;
            line-height: 1.8;
            margin: 0 0 18px;
        }
        .aside-badge {
            display: inline-flex;
            align-items: center;
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 99px;
        }

        /* ============ related ============ */
        .related-wrap {
            padding: 78px 0 20px;
            background: var(--bg);
        }
        .related-title {
            font-size: 28px;
            font-weight: 700;
            margin: 0;
            color: var(--text);
            line-height: 1.4;
        }
        .rel-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 38px;
        }
        .rel-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .rel-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .rel-cover {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--brand-soft);
        }
        .rel-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease;
        }
        .rel-card:hover .rel-cover img {
            transform: scale(1.03);
        }
        .rel-body {
            padding: 22px 22px 26px;
        }
        .rel-body h3 {
            font-size: 18px;
            line-height: 1.55;
            margin: 12px 0 10px;
            color: var(--text);
            font-weight: 600;
        }
        .rel-body h3 a {
            color: inherit;
        }
        .rel-body h3 a:hover {
            color: var(--brand);
        }
        .rel-body p {
            color: var(--text-2);
            font-size: 14px;
            line-height: 1.8;
            margin: 0;
        }
        .rel-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 18px;
        }
        .more-text {
            color: var(--brand);
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .more-text::after {
            content: "→";
            transition: transform .2s;
        }
        .more-text:hover::after {
            transform: translateX(4px);
        }

        /* ============ CTA ============ */
        .cta-section {
            background: var(--dark);
            margin-top: 84px;
            padding: 72px 0;
        }
        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 36px;
            flex-wrap: wrap;
        }
        .cta-inner h2 {
            color: #fff;
            font-size: 28px;
            font-weight: 700;
            margin: 0 0 8px;
            letter-spacing: .5px;
        }
        .cta-inner p {
            color: rgba(255, 255, 255, .7);
            font-size: 16px;
            margin: 0;
        }
        .btn-white {
            background: #fff;
            color: var(--brand-deep);
            box-shadow: 0 8px 20px rgba(0, 0, 0, .12);
        }
        .btn-white:hover {
            background: var(--brand-soft);
            color: var(--brand-deep);
            transform: translateY(-2px);
        }
        .btn-outline-light {
            border-color: rgba(255, 255, 255, .42);
            color: #fff;
            background: transparent;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, .1);
            color: #fff;
            border-color: #fff;
        }

        /* ========== empty state ========== */
        .notfound-section {
            padding: 86px 0 110px;
            min-height: 420px;
        }
        .empty-card {
            max-width: 620px;
            margin: 0 auto;
            text-align: center;
            background: #fff;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            border-radius: var(--radius-lg);
            padding: 52px 40px;
        }
        .empty-code {
            font-size: 72px;
            font-weight: 700;
            color: var(--brand-soft);
            line-height: 1;
            letter-spacing: 2px;
            margin-bottom: 12px;
        }
        .empty-card h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 10px;
        }
        .empty-card p {
            color: var(--text-2);
            margin: 0 0 26px;
        }

        /* ========== footer ========== */
        .footer-area {
            background: var(--dark);
            color: rgba(255, 255, 255, .82);
            padding: 74px 0 30px;
        }
        .footer-cols {
            display: grid;
            grid-template-columns: 1.4fr 0.9fr 0.9fr 1.2fr;
            gap: 50px;
            padding-bottom: 46px;
            border-bottom: 1px solid rgba(255, 255, 255, .1);
        }
        .logo-name-white {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
        }
        .footer-title {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, .7);
            font-size: 15px;
        }
        .footer-links a:hover {
            color: #7CC5F0;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 26px;
            color: rgba(255, 255, 255, .5);
            font-size: 13px;
            line-height: 1.8;
        }

        /* ============ media ============ */
        @media (max-width: 1180px) {
            .article-grid {
                grid-template-columns: minmax(0, 1fr) 260px;
                gap: 32px;
            }
            .rel-grid {
                gap: 20px;
            }
        }
        @media (max-width: 1024px) {
            .section-space {
                padding: 72px 0;
            }
            .header-inner {
                height: 70px;
            }
            .nav-divider,
            .header-right>a.btn {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-links {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                border-top: 1px solid var(--line);
                box-shadow: 0 20px 36px rgba(16, 50, 80, .12);
                display: none;
                flex-direction: column;
                align-items: stretch;
                padding: 14px;
                gap: 4px;
            }
            body.nav-open .nav-links {
                display: flex;
            }
            .nav-item {
                border-radius: 10px;
                font-size: 16px;
                padding: 0 16px;
            }
            .nav-item.active::after {
                display: none;
            }
            .nav-item.active {
                background: var(--brand-soft);
            }
            .footer-cols {
                grid-template-columns: 1fr 1fr;
                gap: 36px 24px;
            }
        }
        @media (max-width: 920px) {
            .article-grid {
                grid-template-columns: 1fr;
            }
            .article-aside {
                position: static;
                display: grid;
                grid-template-columns: 1fr;
            }
            .aside-card:first-child {
                display: none;
            }
            .container-site {
                width: min(100% - 40px, 1240px);
            }
        }
        @media (max-width: 768px) {
            .article-section {
                padding: 30px 0 60px;
            }
            .rel-grid {
                grid-template-columns: 1fr;
            }
            .section-head {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 560px) {
            .article-hero-title {
                font-size: 27px;
            }
            .article-panel {
                padding: 24px 18px;
                border-radius: 14px;
            }
            .cta-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .post-nav {
                grid-template-columns: 1fr;
            }
            .post-nav-box.next {
                text-align: left;
            }
            .post-nav-box.next .post-nav-label {
                text-align: left;
            }
            .footer-cols {
                grid-template-columns: 1fr;
                padding-bottom: 28px;
            }
            .footer-area {
                padding: 50px 0 24px;
            }
            .notfound-section {
                padding: 50px 0 70px;
            }
            .empty-card {
                padding: 40px 22px;
            }
        }

/* roulang page: category3 */
:root {
            --brand: #1478BC;
            --brand-hover: #0D5A94;
            --brand-light: #EDF6FB;
            --brand-border: #D6E5EF;
            --accent: #F06440;
            --accent-light: #FDEFEB;
            --success: #2F9B6A;
            --success-light: #EAF6F0;
            --warning: #C8871A;
            --bg: #F7FAFE;
            --card: #FFFFFF;
            --text-main: #1C3B52;
            --text-sub: #4B647A;
            --text-muted: #7C92A5;
            --line: #E6EDF3;
            --deep: #0F2B43;
            --deep-line: rgba(255, 255, 255, .12);
            --radius-xl: 18px;
            --radius-lg: 14px;
            --radius-btn: 9px;
            --shadow-card: 0 2px 10px rgba(18, 57, 90, .06);
            --shadow-hover: 0 14px 28px rgba(18, 57, 90, .10);
            --shadow-pop: 0 18px 40px rgba(12, 40, 70, .16);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            min-width: 360px;
            background: var(--bg);
            color: var(--text-main);
            font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
            font-size: 16px;
            line-height: 1.8;
        }
        ul,
        ol {
            list-style: none;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input {
            font-family: inherit;
        }

        .container-site {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: rgba(255, 255, 255, .96);
            border-bottom: 1px solid var(--line);
        }
        .header-inner {
            height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .logo-wrap {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--brand);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 21px;
            font-weight: 800;
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            letter-spacing: .5px;
            color: var(--text-main);
            white-space: nowrap;
        }
        .logo-text span {
            color: var(--brand);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-item {
            position: relative;
            display: inline-flex;
            align-items: center;
            min-height: 44px;
            padding: 6px 13px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-sub);
            transition: background .2s ease, color .2s ease;
        }
        .nav-item:hover {
            color: var(--brand);
            background: var(--brand-light);
        }
        .nav-item.active {
            color: var(--brand);
            font-weight: 600;
        }
        .nav-item.active::after {
            content: "";
            position: absolute;
            left: 15px;
            right: 15px;
            bottom: 0;
            height: 3px;
            border-radius: 999px;
            background: var(--brand);
        }
        .nav-cta {
            margin-left: 12px;
        }

        .mobile-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border: 0;
            background: transparent;
            border-radius: 8px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            cursor: pointer;
        }
        .mobile-toggle span {
            width: 22px;
            height: 2px;
            border-radius: 999px;
            background: var(--text-main);
            transition: transform .2s ease;
            display: block;
        }
        .mobile-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .mobile-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0 24px;
            border: 1px solid transparent;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            cursor: pointer;
            transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--brand-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(20, 120, 188, .18);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 10px rgba(20, 120, 188, .14);
        }
        .btn-outline {
            background: #fff;
            border-color: var(--brand-border);
            color: var(--brand);
        }
        .btn-outline:hover {
            background: var(--brand-light);
            border-color: var(--brand);
            transform: translateY(-2px);
        }
        .btn-outline-white {
            background: transparent;
            border-color: rgba(255, 255, 255, .8);
            color: #fff;
        }
        .btn-outline-white:hover {
            background: rgba(255, 255, 255, .12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn:focus-visible {
            outline: 3px solid rgba(20, 120, 188, .28);
            outline-offset: 2px;
        }
        .btn-primary:focus-visible {
            outline-color: #9CC6E6;
        }

        /* section */
        .section {
            padding: 84px 0;
        }
        .section-white {
            background: #fff;
        }
        .section-soft {
            background: #F3F8FC;
        }
        .section-title {
            font-size: clamp(28px, 3vw, 34px);
            line-height: 1.35;
            font-weight: 700;
            color: var(--text-main);
        }
        .section-sub {
            color: var(--text-sub);
            font-size: 16px;
            max-width: 720px;
            margin-top: 12px;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .2px;
            background: var(--brand-light);
            color: var(--brand);
        }

        /* hero */
        .category-hero {
            background: #fff;
            border-bottom: 1px solid var(--line);
            position: relative;
            overflow: hidden;
            padding: 56px 0 68px;
        }
        .category-hero::before {
            content: "";
            position: absolute;
            top: -140px;
            right: -100px;
            width: 440px;
            height: 440px;
            border-radius: 50%;
            background: rgba(237, 246, 251, .8);
            filter: blur(20px);
            z-index: 0;
            pointer-events: none;
        }
        .category-hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
            gap: 56px;
            align-items: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--brand-light);
            color: var(--brand);
            padding: 5px 13px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .hero-title {
            font-size: clamp(32px, 4vw, 42px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 14px;
        }
        .hero-description {
            max-width: 56ch;
            font-size: 16px;
            color: var(--text-sub);
            line-height: 1.9;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-top: 30px;
        }
        .hero-note {
            margin-top: 18px;
            font-size: 13px;
            color: var(--text-muted);
            border-left: 3px solid var(--brand-border);
            padding-left: 14px;
            line-height: 1.8;
        }
        .category-hero-media {
            position: relative;
            z-index: 2;
        }
        .category-hero-media img {
            width: 100%;
            border-radius: 22px;
            object-fit: cover;
            box-shadow: 0 18px 40px rgba(12, 40, 70, .14);
            max-height: 390px;
        }
        .hero-media-card {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 20px;
            background: #fff;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            border-radius: var(--radius-lg);
            padding: 14px 18px;
        }
        .hero-media-card strong {
            color: var(--brand);
            font-size: 18px;
        }
        .hero-media-card span {
            font-size: 13px;
            color: var(--text-sub);
        }

        /* content intro */
        .intro-strip {
            padding: 44px 0 20px;
        }
        .intro-strip p {
            max-width: 1000px;
            margin: 0 auto;
            font-size: 17px;
            color: var(--text-sub);
            line-height: 2;
            text-align: center;
        }

        /* feature rows */
        .feature-block {
            padding: 78px 0 10px;
        }
        .feature-row {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
            gap: 64px;
            align-items: center;
            padding-bottom: 76px;
        }
        .feature-row + .feature-row {
            border-top: 1px solid var(--line);
            padding-top: 76px;
        }
        .feature-media {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .feature-media img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
        }
        .feature-copy h2 {
            font-size: clamp(24px, 2.6vw, 30px);
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-main);
            margin: 14px 0 16px;
        }
        .feature-copy p {
            color: var(--text-sub);
            margin-bottom: 18px;
        }
        .feature-list li {
            position: relative;
            padding-left: 22px;
            color: var(--text-sub);
            margin-top: 10px;
        }
        .feature-list li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 12px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
        }
        .feature-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 18px;
            color: var(--brand);
            font-weight: 600;
        }
        .feature-link:hover {
            color: var(--brand-hover);
        }

        /* process */
        .process-block {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            padding: 84px 0;
        }
        .process-head {
            max-width: 700px;
            margin-bottom: 42px;
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .process-item {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 28px 26px;
            transition: transform .2s ease, box-shadow .2s ease;
        }
        .process-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .process-num {
            font-size: 13px;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 1px;
        }
        .process-item h3 {
            font-size: 19px;
            font-weight: 600;
            margin: 12px 0 10px;
        }
        .process-item p {
            color: var(--text-sub);
            font-size: 15px;
        }

        /* direction */
        .direction-block {
            padding: 84px 0;
        }
        .direction-head {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 34px;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 52px;
        }
        .tag-chip {
            display: inline-flex;
            align-items: center;
            min-height: 40px;
            padding: 4px 18px;
            border-radius: 999px;
            background: #fff;
            border: 1px solid var(--brand-border);
            color: var(--text-sub);
            font-size: 14px;
            font-weight: 500;
            transition: background .2s, color .2s, border-color .2s;
        }
        .tag-chip:hover {
            background: var(--brand-light);
            border-color: var(--brand);
            color: var(--brand);
        }
        .tag-chip.hot {
            background: var(--accent-light);
            border-color: #F6C8B8;
            color: var(--accent);
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .scenario-item {
            display: flex;
            gap: 18px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 22px 24px;
            box-shadow: var(--shadow-card);
            transition: box-shadow .2s ease, transform .2s ease;
        }
        .scenario-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .scenario-no {
            font-size: 14px;
            font-weight: 700;
            color: var(--brand);
            background: var(--brand-light);
            width: 42px;
            height: 42px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex: 0 0 42px;
        }
        .scenario-item h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-main);
        }
        .scenario-item p {
            color: var(--text-sub);
            font-size: 14px;
            line-height: 1.85;
        }

        /* faq */
        .faq-block {
            background: #F7FAFE;
            padding: 84px 0;
        }
        .faq-wrap {
            max-width: 860px;
            margin: 46px auto 0;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            margin-top: 14px;
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: box-shadow .2s ease;
        }
        .faq-item[open] {
            box-shadow: var(--shadow-hover);
        }
        .faq-item summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            min-height: 62px;
            padding: 14px 24px;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-main);
            font-size: 16px;
            position: relative;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: "＋";
            color: var(--brand);
            font-size: 20px;
            font-weight: 400;
            flex: 0 0 20px;
            text-align: center;
            transition: transform .2s ease;
        }
        .faq-item[open] summary::after {
            content: "×";
            transform: rotate(0deg);
        }
        .faq-no {
            color: var(--brand);
            font-size: 13px;
            margin-right: 12px;
        }
        .faq-answer {
            padding: 0 24px 22px;
            color: var(--text-sub);
            line-height: 2;
        }

        /* cta strip */
        .cta-strip {
            background: var(--deep);
            color: #fff;
            border-bottom: 1px solid var(--deep-line);
        }
        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            padding: 50px 0 56px;
            flex-wrap: wrap;
        }
        .cta-inner .cta-copy {
            max-width: 720px;
        }
        .cta-inner h2 {
            font-size: clamp(24px, 3vw, 32px);
            line-height: 1.4;
            font-weight: 700;
        }
        .cta-inner p {
            color: rgba(255, 255, 255, .72);
            margin-top: 12px;
            line-height: 1.9;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* footer */
        .footer-area {
            background: var(--deep);
            color: #AFC6DA;
        }
        .footer-cols {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.35fr;
            gap: 40px;
            padding: 52px 0 28px;
        }
        .footer-title {
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            margin-bottom: 14px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            color: #AFC6DA;
            font-size: 14px;
            line-height: 1.6;
            transition: color .2s ease;
        }
        .footer-links a:hover {
            color: #7CC5F0;
        }
        .footer-bottom {
            border-top: 1px solid var(--deep-line);
            padding: 18px 0 22px;
            margin-top: 16px;
        }
        .footer-bottom p {
            color: rgba(255, 255, 255, .66);
            font-size: 13px;
            line-height: 1.8;
        }

        /* responsive */
        @media (max-width: 1024px) {
            .category-hero-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .category-hero-media {
                max-width: 680px;
            }
            .feature-row {
                gap: 36px;
            }
            .footer-cols {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .process-grid {
                gap: 16px;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--line);
                box-shadow: var(--shadow-pop);
                flex-direction: column;
                align-items: stretch;
                padding: 14px 24px 22px;
                gap: 6px;
            }
            .nav-links.menu-open {
                display: flex;
            }
            .nav-item {
                min-height: 46px;
                border-bottom: 1px solid var(--line);
                border-radius: 0;
                color: var(--text-sub);
            }
            .nav-item.active::after {
                left: 4px;
                right: auto;
                width: 3px;
                height: 22px;
                top: 12px;
                bottom: auto;
                border-radius: 999px;
            }
            .nav-cta {
                width: 100%;
                margin-top: 12px;
            }
            .mobile-toggle {
                display: flex;
            }
            .direction-head {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 768px) {
            body {
                line-height: 1.75;
            }
            .section {
                padding: 56px 0;
            }
            .category-hero {
                padding: 36px 0 44px;
            }
            .category-hero-media img {
                max-height: 260px;
            }
            .hero-actions .btn {
                width: calc(50% - 7px);
            }
            .feature-row,
            .feature-row+.feature-row {
                grid-template-columns: 1fr;
                gap: 22px;
                padding: 48px 0;
                border-top: 0;
            }
            .feature-row+.feature-row {
                margin-top: 48px;
                padding-top: 0;
            }
            .feature-copy h2 {
                margin-top: 6px;
            }
            .process-block {
                padding: 56px 0;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .cta-inner {
                flex-direction: column;
                align-items: flex-start;
                padding: 44px 0 48px;
            }
            .cta-actions .btn {
                width: calc(50% - 6px);
            }
            .footer-cols {
                grid-template-columns: 1fr;
                gap: 28px;
                padding-top: 38px;
            }
            .faq-wrap {
                margin-top: 28px;
            }
            .faq-item summary {
                align-items: flex-start;
                padding: 14px 20px;
            }
            .faq-answer {
                padding-left: 20px;
                padding-right: 20px;
            }
        }

        @media (max-width: 520px) {
            .container-site {
                padding-left: 18px;
                padding-right: 18px;
            }
            .header-inner {
                height: 68px;
            }
            .logo-text {
                font-size: 17px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 17px;
            }
            .nav-links {
                top: 68px;
                padding-left: 18px;
                padding-right: 18px;
            }
            .hero-title {
                font-size: 30px;
            }
            .hero-description {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .tag-cloud {
                gap: 8px;
            }
            .tag-chip {
                padding: 2px 14px;
                font-size: 13px;
                min-height: 36px;
            }
            .scenario-item {
                flex-direction: column;
                gap: 12px;
            }
            .cta-actions {
                flex-direction: column;
            }
            .cta-actions .btn {
                width: 100%;
            }
            .process-item {
                padding: 22px 18px;
            }
            .section-title {
                font-size: 26px;
            }
        }

/* roulang page: category2 */
:root{
    --brand:#1478BC;
    --brand-dark:#0D5A94;
    --brand-soft:#EDF6FB;
    --brand-line:#D6E5EF;
    --accent:#F06440;
    --accent-soft:#FDEFEB;
    --success:#2F9B6A;
    --success-soft:#EAF6F0;
    --page-bg:#F7FAFE;
    --card-bg:#FFFFFF;
    --text-main:#1C3B52;
    --text-sub:#4B647A;
    --text-weak:#7C92A5;
    --line:#E6EDF3;
    --dark:#0F2B43;
    --radius-card:17px;
    --radius-control:9px;
    --shadow-card:0 2px 10px rgba(18,57,90,.06);
    --shadow-hover:0 14px 28px rgba(18,57,90,.12);
    --section-space:96px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{
    background:var(--page-bg);
    color:var(--text-main);
    font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,sans-serif;
    font-size:16px;
    line-height:1.8;
    -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input{font-family:inherit;font-size:inherit}
.container-site{max-width:1260px;margin:0 auto;padding:0 24px}
.section{padding:var(--section-space) 0}
.section-light{background:#fff}
.section-soft{background:#EFF6FB}
.section [id]{scroll-margin-top:112px}

.site-header{
    position:sticky;top:0;z-index:80;
    height:82px;
    background:rgba(255,255,255,.97);
    border-bottom:1px solid var(--line);
    box-shadow:0 4px 16px rgba(18,57,90,.05);
}
.header-inner{
    height:82px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:18px;
}
.logo-wrap{display:inline-flex;align-items:center;gap:11px;flex-shrink:0}
.logo-icon{
    width:44px;height:44px;
    display:inline-flex;align-items:center;justify-content:center;
    background:var(--brand);
    color:#fff;
    font-size:22px;font-weight:800;
    border-radius:12px;
    box-shadow:0 6px 14px rgba(20,120,188,.22);
}
.logo-text{font-size:21px;font-weight:800;letter-spacing:.2px;color:var(--text-main);white-space:nowrap}
.logo-text em{color:var(--brand);font-style:normal}
.site-header .nav-links.flex{
    display:flex;
    align-items:center;
    gap:2px;
    margin-left:auto;
}
.nav-item{
    position:relative;
    display:inline-flex;
    align-items:center;
    min-height:46px;
    padding:0 13px;
    font-size:15px;
    font-weight:600;
    color:var(--text-sub);
    border-radius:8px;
    transition:color .18s ease, background .18s ease;
    white-space:nowrap;
}
.nav-item:hover{color:var(--brand);background:rgba(237,246,251,.72)}
a.nav-item.active{color:var(--brand)}
a.nav-item.active::after{
    content:"";
    position:absolute;
    left:13px;right:13px;bottom:2px;
    height:3px;
    border-radius:99px;
    background:var(--brand);
}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:10px;flex-shrink:0}
.header-login-btn{min-height:42px;padding:0 18px}
.nav-toggle{
    width:44px;height:44px;
    border:1px solid var(--line);
    background:#fff;
    border-radius:10px;
    display:none;
    align-items:center;
    justify-content:center;
    flex-direction:column;
    gap:5px;
    cursor:pointer;
}
.nav-toggle span{
    display:block;width:20px;height:2px;background:var(--text-main);border-radius:2px;transition:.2s;
}
.site-header.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.site-header.nav-open .nav-toggle span:nth-child(2){opacity:0}
.site-header.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-login-btn{display:none}

.btn{
    display:inline-flex;align-items:center;justify-content:center;
    min-height:47px;
    padding:0 22px;
    border-radius:var(--radius-control);
    border:1px solid transparent;
    font-weight:600;
    font-size:15px;
    line-height:1.2;
    cursor:pointer;
    transition:transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}
.btn:focus-visible{outline:3px solid rgba(20,120,188,.32);outline-offset:2px}
.btn-primary{
    background:var(--brand);
    color:#fff;
    box-shadow:0 8px 18px rgba(20,120,188,.18);
}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 12px 22px rgba(20,120,188,.24)}
.btn-primary:active{transform:translateY(1px);box-shadow:0 4px 10px rgba(20,120,188,.16)}
.btn-secondary{
    background:#fff;color:var(--brand);
    border-color:#C5D7E4;
    box-shadow:0 3px 8px rgba(18,57,90,.04);
}
.btn-secondary:hover{background:var(--brand-soft);border-color:var(--brand);transform:translateY(-2px)}
.btn-secondary:active{transform:translateY(1px)}
.btn-sm{min-height:42px;padding:0 17px;font-size:14px}
.btn-block{width:100%}

.page-hero{
    position:relative;
    padding:74px 0 78px;
    overflow:hidden;
    background:
        linear-gradient(90deg,rgba(247,250,254,.96),rgba(255,255,255,.93)),
        url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero-grid{
    display:grid;
    grid-template-columns:1.06fr .94fr;
    gap:64px;
    align-items:center;
}
.hero-copy{position:relative;z-index:1}
.hero-tag{
    display:inline-flex;align-items:center;
    gap:8px;
    padding:6px 14px;
    border-radius:999px;
    background:var(--brand-soft);
    border:1px solid var(--brand-line);
    color:var(--brand);
    font-weight:600;
    font-size:14px;
}
.hero-title{
    font-size:44px;
    line-height:1.22;
    font-weight:800;
    color:var(--text-main);
    margin:20px 0 14px;
    letter-spacing:-.3px;
}
.hero-lead{
    font-size:17px;
    color:var(--text-sub);
    max-width:570px;
    margin-bottom:27px;
    line-height:2;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:24px}
.hero-note{
    display:flex;align-items:center;gap:9px;
    font-size:13px;color:var(--text-weak);
}
.dot-green{width:8px;height:8px;border-radius:50%;background:var(--success);display:inline-block;box-shadow:0 0 0 4px rgba(47,155,106,.13)}
.hero-panel{
    position:relative;z-index:1;
    background:#fff;
    border-radius:20px;
    padding:26px;
    box-shadow:0 22px 48px rgba(18,57,90,.11);
    border:1px solid #EAF1F7;
}
.panel-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.panel-label{
    font-weight:800;font-size:18px;
}
.panel-badge{
    display:inline-flex;align-items:center;gap:6px;
    font-size:12px;font-weight:600;color:var(--success);
    background:var(--success-soft);
    padding:4px 11px;
    border-radius:999px;
}
.hero-panel h3{
    font-size:20px;
    margin-bottom:16px;
    color:var(--text-main);
    font-weight:700;
}
.hero-list{
    list-style:none;
    padding:0;
    margin:0 0 22px;
    border-top:1px solid var(--line);
}
.hero-list li{
    display:flex;align-items:flex-start;
    padding:12px 0;
    border-bottom:1px solid var(--line);
    font-size:14px;
    color:var(--text-sub);
    gap:10px;
}
.hero-list li::before{
    content:"✓";
    flex:none;
    width:20px;height:20px;
    border-radius:50%;
    background:var(--success-soft);
    color:var(--success);
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-size:11px;
    margin-top:3px;
    font-weight:800;
}
.panel-muted{font-size:12px;color:var(--text-weak);text-align:center;margin-top:14px}

.quick-grid{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:22px;
    margin-top:56px;
    position:relative;z-index:1;
}
.quick-card{
    background:#fff;
    border:1px solid #EAF1F7;
    border-radius:16px;
    padding:22px 22px 20px;
    box-shadow:var(--shadow-card);
    transition:.2s ease;
}
.quick-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--brand-line)}
.quick-card .q-icon{
    width:42px;height:42px;
    border-radius:13px;
    display:inline-flex;align-items:center;justify-content:center;
    background:var(--brand-soft);
    color:var(--brand);
    font-size:18px;
    font-weight:800;
    margin-bottom:14px;
}
.quick-card h3{font-size:16px;font-weight:700;color:var(--text-main);margin-bottom:6px}
.quick-card p{font-size:13px;color:var(--text-weak);line-height:1.75}

.section-head{max-width:760px;margin-bottom:46px}
.eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-size:13px;
    font-weight:700;
    color:var(--brand);
    letter-spacing:.3px;
    padding:5px 13px;
    background:var(--brand-soft);
    border-radius:999px;
}
.title-h2{
    font-size:32px;
    font-weight:800;
    color:var(--text-main);
    margin:17px 0 10px;
    line-height:1.35;
}
.sec-desc{font-size:16px;color:var(--text-sub)}
.split-grid{
    display:grid;
    grid-template-columns:1fr 1.08fr;
    gap:72px;
    align-items:center;
}
.media-frame{
    border-radius:20px;
    overflow:hidden;
    box-shadow:0 20px 44px rgba(18,57,90,.12);
    border:1px solid #EAF1F7;
    background:#fff;
}
.feature-img{width:100%;height:100%;min-height:320px;object-fit:cover;transition:transform .5s ease}
.media-frame:hover .feature-img{transform:scale(1.03)}
.content-two h2{margin-top:0}
.content-lead{margin:6px 0 24px}
.tick-list{
    list-style:none;
    padding:0;
    margin:0 0 28px;
}
.tick-list li{
    position:relative;
    padding:10px 0 10px 44px;
    font-size:15px;
    color:var(--text-sub);
    line-height:1.85;
    border-bottom:1px dashed #E2EBF2;
}
.tick-list li:last-child{border-bottom:none}
.tick-list li::before{
    content:"✓";
    position:absolute;
    left:0;top:12px;
    width:28px;height:28px;
    border-radius:50%;
    background:var(--success-soft);
    color:var(--success);
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-size:13px;
    font-weight:800;
}
.tag-inline{
    display:inline-flex;
    margin-right:10px;
    background:#fff;
    border:1px solid var(--line);
    color:var(--text-sub);
    font-size:13px;
    padding:4px 12px;
    border-radius:99px;
    margin-top:8px;
}

.process-section{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.process-grid{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:22px;
}
.process-card{
    background:var(--page-bg);
    border:1px solid var(--line);
    border-radius:18px;
    padding:25px 23px;
    transition:.2s ease;
    position:relative;
}
.process-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);background:#fff}
.process-num{
    font-size:42px;
    font-weight:900;
    line-height:1;
    color:rgba(20,120,188,.18);
    margin-bottom:20px;
    letter-spacing:-1px;
}
.process-card h3{font-size:18px;font-weight:700;color:var(--text-main);margin-bottom:9px}
.process-card p{font-size:14px;color:var(--text-sub);line-height:1.85}

.direction-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:18px;
}
.direction-item{
    display:flex;
    gap:16px;
    background:#fff;
    border:1px solid #E9F0F6;
    border-radius:16px;
    padding:22px 20px;
    box-shadow:var(--shadow-card);
    transition:.2s ease;
}
.direction-item:hover{border-color:var(--brand-line);box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.dir-symbol{
    flex:none;
    width:46px;height:46px;
    border-radius:14px;
    background:linear-gradient(135deg,rgba(20,120,188,.1),rgba(20,120,188,.03));
    border:1px solid rgba(20,120,188,.12);
    display:inline-flex;
    align-items:center;
    justify-content:center;
    color:var(--brand);
    font-weight:800;
    font-size:18px;
}
.direction-item h3{font-size:16px;font-weight:700;margin-bottom:4px}
.direction-item p{font-size:13px;color:var(--text-weak);line-height:1.8}

.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{
    background:#fff;
    border:1px solid var(--line);
    border-radius:17px;
    margin-bottom:14px;
    box-shadow:var(--shadow-card);
    overflow:hidden;
    transition:.18s ease;
}
.faq-item.open{box-shadow:0 12px 26px rgba(18,57,90,.09);border-color:#CDE0EC}
.faq-button{
    width:100%;
    min-height:62px;
    display:flex;
    align-items:center;
    gap:15px;
    background:none;
    border:none;
    padding:10px 22px;
    text-align:left;
    cursor:pointer;
    color:var(--text-main);
    font-weight:700;
    font-size:16px;
}
.faq-button:focus-visible{outline:3px solid rgba(20,120,188,.3);outline-offset:-2px;border-radius:17px}
.faq-index{
    color:var(--brand);
    font-weight:800;
    font-size:13px;
    letter-spacing:.2px;
}
.faq-icon{
    width:28px;height:28px;
    margin-left:auto;
    border-radius:50%;
    background:var(--brand-soft);
    display:inline-flex;
    align-items:center;
    justify-content:center;
    color:var(--brand);
    font-size:16px;
    flex:none;
    transition:transform .18s ease;
}
.faq-item.open .faq-icon{background:var(--brand);color:#fff;transform:rotate(45deg)}
.faq-answer-box{max-height:0;overflow:hidden;transition:max-height .18s ease}
.faq-item.open .faq-answer-box{max-height:500px}
.faq-answer-box p{padding:0 24px 22px 66px;color:var(--text-sub);line-height:2;font-size:15px}

.cta-band{background:var(--dark);color:#fff}
.cta-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:32px;
    padding:52px 0;
}
.cta-band h2{color:#fff;font-size:28px;font-weight:800;line-height:1.4}
.cta-band p{color:rgba(255,255,255,.72);font-size:15px;margin-top:8px;line-height:1.9}
.cta-actions{flex-shrink:0}
.cta-actions .btn-primary{background:#fff;color:var(--brand);box-shadow:none}
.cta-actions .btn-primary:hover{background:#E3F0F9;color:var(--brand-dark);box-shadow:0 12px 30px rgba(0,0,0,.18)}
.cta-actions .btn-primary:active{background:#D7EAF5}

.footer-area{background:var(--dark);color:rgba(255,255,255,.74);border-top:1px solid rgba(255,255,255,.08);padding-top:64px}
.footer-cols{
    display:grid;
    grid-template-columns:1.5fr .9fr .9fr 1.1fr;
    gap:46px;
    padding-bottom:40px;
}
.footer-title{
    color:#fff;
    font-weight:700;
    font-size:17px;
    margin-bottom:16px;
}
.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-links a,.footer-link-anchor{color:rgba(255,255,255,.7);font-size:14px;transition:.18s}
.footer-links a:hover,.footer-link-anchor:hover{color:#7cc5f0}
.footer-bottom{
    border-top:1px solid rgba(255,255,255,.12);
    padding:19px 0;
    text-align:center;
    font-size:13px;
    color:rgba(255,255,255,.48);
}
.footer-bottom p{margin:0}

@media(max-width:1024px){
    .site-header{height:auto;min-height:74px}
    .header-inner{height:74px;flex-wrap:nowrap}
    .site-header .nav-links.flex{
        display:none;
        position:absolute;
        top:100%;left:16px;right:16px;
        flex-direction:column;
        gap:2px;
        margin:0;
        background:#fff;
        border:1px solid var(--line);
        border-radius:18px;
        box-shadow:0 20px 48px rgba(18,57,90,.17);
        padding:10px;
    }
    .site-header.nav-open .nav-links.flex{display:flex}
    .nav-item{width:100%;min-height:48px;padding:0 14px;justify-content:flex-start}
    a.nav-item.active::after{display:none}
    a.nav-item.active{background:var(--brand-soft);color:var(--brand)}
    .nav-toggle{display:inline-flex}
    .header-login-btn{display:none}
    .mobile-login-btn{display:flex;width:100%;margin-top:8px}
    .hero-grid{grid-template-columns:1fr;gap:44px}
    .hero-panel{max-width:620px}
    .split-grid{grid-template-columns:1fr;gap:38px}
    .process-grid{grid-template-columns:repeat(2,1fr)}
    .direction-grid{grid-template-columns:repeat(2,1fr)}
    .cta-inner{flex-direction:column;align-items:flex-start;padding:42px 0}
    .footer-cols{grid-template-columns:1fr 1fr;gap:38px}
}
@media(max-width:767px){
    .section{padding:72px 0}
    .container-site{padding:0 18px}
    .logo-text{font-size:18px}
    .logo-icon{width:40px;height:40px;font-size:20px}
    .page-hero{padding:52px 0 58px}
    .hero-title{font-size:32px}
    .hero-lead{font-size:15px}
    .quick-grid{grid-template-columns:repeat(2,1fr);margin-top:38px}
    .quick-card{padding:18px}
    .title-h2{font-size:26px}
    .faq-answer-box p{padding-left:22px;padding-right:20px}
    .direction-grid{grid-template-columns:1fr}
    .process-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
    .footer-cols{grid-template-columns:1fr;gap:28px}
    .footer-links{flex-direction:row;flex-wrap:wrap;gap:8px 18px}
    .site-header .nav-links.flex{width:auto}
    .nav-item{font-size:16px}
    .hero-title{font-size:29px}
    .hero-actions{flex-direction:column;align-items:stretch}
    .hero-actions .btn{width:100%}
}

/* roulang page: category4 */
:root{
  --brand:#1478BC;
  --brand-dark:#0D5A94;
  --brand-light:#EDF6FB;
  --brand-border:#D6E5EF;
  --accent:#F06440;
  --accent-light:#FDEFEB;
  --ok:#2F9B6A;
  --ok-light:#EAF6F0;
  --warn:#C8871A;
  --page:#F7FAFE;
  --card:#FFFFFF;
  --ink:#1C3B52;
  --ink-2:#4B647A;
  --ink-3:#7C92A5;
  --line:#E6EDF3;
  --dark:#0F2B43;
  --dark-soft:#123A5A;
  --radius:18px;
  --radius-sm:10px;
  --shadow-sm:0 2px 10px rgba(18,57,90,.06);
  --shadow-md:0 14px 28px rgba(18,57,90,.12);
  --shadow-pop:0 18px 40px rgba(12,40,70,.16);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  background:var(--page);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p{margin:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.container-site{width:min(100%,1240px);margin:0 auto;padding:0 24px}
.section-pad{padding:92px 0;position:relative}
.section-light{background:#fff}
.section-tag{display:inline-flex;align-items:center;gap:8px;padding:5px 13px;border-radius:999px;background:var(--brand-light);color:var(--brand);font-size:13px;font-weight:600;letter-spacing:.02em}
.section-title{font-size:31px;line-height:1.3;font-weight:700;color:var(--ink);margin:14px 0 14px}
.section-lead{max-width:760px;color:var(--ink-2);font-size:16px;line-height:1.9}
.section-head{margin-bottom:44px}
.muted{color:var(--ink-3)}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:none}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:76px;position:relative}
.logo-wrap{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--brand),#1A9FD8);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700}
.logo-text{font-size:20px;font-weight:700;color:var(--ink);line-height:1.2;letter-spacing:.01em}
.logo-text .logo-accent{color:var(--brand)}
.site-nav{display:flex;align-items:center;gap:14px}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-item{position:relative;display:inline-flex;align-items:center;padding:25px 12px;font-size:15px;font-weight:500;color:#566F85;line-height:1;transition:color .2s ease}
.nav-item:hover{color:var(--brand)}
.nav-item.active{color:var(--brand);font-weight:600}
.nav-item.active::after{content:"";position:absolute;left:14px;right:14px;bottom:14px;height:3px;border-radius:4px;background:var(--brand)}
.btn-nav{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 18px;border-radius:10px;border:1px solid var(--brand);color:var(--brand);font-size:14px;font-weight:600;transition:all .2s ease;white-space:nowrap}
.btn-nav:hover{background:var(--brand);color:#fff;border-color:var(--brand)}
.site-nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.site-nav-toggle span{display:block;width:18px;height:2px;background:#233F54;border-radius:2px;transition:all .2s ease}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 26px;border-radius:10px;font-size:15px;font-weight:600;transition:all .2s ease;white-space:nowrap}
.btn-primary{background:var(--brand);color:#fff;border:1px solid var(--brand)}
.btn-primary:hover{background:var(--brand-dark);border-color:var(--brand-dark);transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-primary:active{transform:translateY(0) scale(.98)}
.btn-line{background:#fff;color:var(--brand);border:1px solid var(--brand);box-shadow:0 1px 2px rgba(18,57,90,.04)}
.btn-line:hover{background:var(--brand-light);border-color:var(--brand-dark);color:var(--brand-dark)}
.btn-white{background:#fff;color:var(--dark);border:1px solid transparent}
.btn-white:hover{background:#eaf3fb;transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-ghost{background:transparent;color:rgba(255,255,255,.88);border:1px solid rgba(255,255,255,.42)}
.btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08)}
.btn:focus-visible,.nav-item:focus-visible,.site-nav-toggle:focus-visible,.nav-cta:focus-visible,.faq-question:focus-visible{outline:3px solid rgba(20,120,188,.35);outline-offset:2px}

/* category hero */
.cat-banner{position:relative;padding:58px 0 56px;background-color:#eaf4fb;background-image:linear-gradient(96deg,rgba(255,255,255,.96) 0,rgba(255,255,255,.92) 36%,rgba(221,241,251,.72) 84%),url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center;border-bottom:1px solid var(--line)}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-3);margin-bottom:26px;flex-wrap:wrap}
.crumb a{color:var(--brand)}
.crumb span{color:var(--ink-3)}
.cat-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.cat-hero-copy h1{font-size:42px;line-height:1.22;margin-bottom:22px;color:var(--ink);font-weight:800}
.cat-hero-copy .lead{font-size:17px;line-height:1.9;color:var(--ink-2);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-tips{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:28px;padding-top:22px;border-top:1px solid rgba(214,229,239,.7);color:var(--ink-2);font-size:13px}
.hero-tips i{font-style:normal;display:inline-flex;align-items:center;justify-content:center;background:var(--ok-light);color:var(--ok);border-radius:50%;margin-right:6px}
.hero-visual{position:relative;padding-left:12px}
.hero-photo-frame{border-radius:22px;overflow:hidden;box-shadow:var(--shadow-pop)}
.hero-photo-frame img{width:100%;height:330px;object-fit:cover}
.float-chip{position:absolute;background:#fff;border-radius:12px;box-shadow:var(--shadow-md);padding:10px 16px;font-size:13px;color:var(--ink-2);display:flex;align-items:center;gap:8px}
.float-chip b{color:var(--ink);font-weight:600}
.float-chip.c1{top:34px;left:-16px}
.float-chip.c2{bottom:26px;right:-4px}
.float-chip .dot{width:10px;height:10px;border-radius:50%;background:var(--ok);flex:none}

/* sections */
.help-feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 56px}
.help-item{display:flex;gap:18px;padding:30px 0;border-top:1px solid var(--line)}
.help-mark{flex:none;width:52px;height:52px;border-radius:16px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;letter-spacing:.02em}
.help-item h3{font-size:18px;font-weight:600;color:var(--ink);margin-bottom:8px}
.help-item p{color:var(--ink-2);font-size:15px;line-height:1.8}

/* step */
.step-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:72px;align-items:center}
.step-media{border-radius:22px;overflow:hidden;box-shadow:var(--shadow-md);position:relative}
.step-media img{width:100%;height:430px;object-fit:cover}
.step-list{display:flex;flex-direction:column;gap:12px}
.step-row{display:grid;grid-template-columns:72px 1fr;gap:18px;padding:22px 0;border-top:1px solid var(--line)}
.step-row:first-child{border-top:0}
.step-num{width:52px;height:52px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;box-shadow:0 8px 16px rgba(20,120,188,.18)}
.step-row:nth-child(2) .step-num{background:#1A9FD8}
.step-row:nth-child(3) .step-num{background:var(--accent)}
.step-row h3{font-size:18px;font-weight:600;color:var(--ink);margin:6px 0 8px}
.step-row p{color:var(--ink-2);font-size:15px}

/* security */
.security-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:64px;align-items:center}
.security-img{border-radius:22px;overflow:hidden;box-shadow:var(--shadow-md)}
.security-img img{width:100%;height:420px;object-fit:cover}
.security-list{list-style:none;padding:0;margin:26px 0 0}
.security-list li{position:relative;padding:0 0 5px 36px;margin-bottom:16px;color:var(--ink-2);line-height:1.8}
.security-list li::before{content:"✓";position:absolute;left:0;top:2px;width:22px;height:22px;border-radius:7px;background:var(--ok-light);color:var(--ok);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.security-stat{display:flex;gap:36px;margin-top:40px;padding-top:26px;border-top:1px solid var(--line)}
.sec-stat-num{font-size:30px;font-weight:800;color:var(--brand);letter-spacing:-.02em}
.sec-stat-label{font-size:13px;color:var(--ink-3);margin-top:2px}

/* topic */
.topic-zone{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;align-items:stretch}
.topic-main-card,.topic-mini-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease}
.topic-main-card:hover,.topic-mini-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.topic-main-card img{width:100%;height:240px;object-fit:cover}
.topic-main-body{padding:26px 28px 28px}
.topic-main-body h3{font-size:22px;font-weight:700;color:var(--ink);margin:10px 0 10px}
.topic-main-body p{color:var(--ink-2);line-height:1.85}
.link-arrow{display:inline-flex;align-items:center;color:var(--brand);font-weight:600;gap:6px;font-size:14px}
.link-arrow:hover{color:var(--brand-dark)}
.mini-topic-list{display:flex;flex-direction:column;gap:18px}
.topic-mini-card{display:grid;grid-template-columns:122px 1fr;padding:10px;gap:18px}
.topic-mini-card img{width:122px;height:100px;object-fit:cover;border-radius:12px}
.topic-mini-body{display:flex;flex-direction:column;justify-content:center;padding-right:6px}
.mini-tag{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:.03em}
.topic-mini-body h3{font-size:17px;font-weight:600;color:var(--ink);margin:5px 0 6px}
.topic-mini-body p{font-size:13px;color:var(--ink-3);line-height:1.65}

/* faq */
.faq-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:54px;align-items:start}
.faq-side .faq-list{margin-top:0}
.faq-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:0 30px;box-shadow:var(--shadow-sm)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:0}
.faq-question{width:100%;display:grid;grid-template-columns:48px 1fr 28px;gap:14px;align-items:center;padding:22px 0;text-align:left;min-height:68px}
.faq-num{font-size:14px;color:var(--brand);font-weight:700;letter-spacing:.04em}
.faq-q-text{font-size:16px;font-weight:600;color:var(--ink);line-height:1.6}
.faq-icon{font-size:22px;font-weight:300;color:var(--ink-3);transition:transform .2s ease}
.faq-item.is-open .faq-icon{transform:rotate(45deg);color:var(--brand)}
.faq-answer{display:none;padding:2px 0 24px 62px;color:var(--ink-2);font-size:15px;line-height:1.9}

/* cta */
.cta-dark{background:var(--dark);color:#fff;padding:72px 0 64px}
.cta-grid{display:flex;align-items:center;justify-content:space-between;gap:48px;flex-wrap:wrap}
.cta-head-title h2{font-size:28px;line-height:1.4;font-weight:700;color:#fff;margin-bottom:10px}
.cta-head-title p{color:rgba(255,255,255,.72);max-width:560px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* footer */
.footer-area{background:var(--dark);color:rgba(255,255,255,.72);font-size:14px;padding:64px 0 34px}
.footer-cols{display:grid;grid-template-columns:1.35fr .8fr .9fr 1.15fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-title{font-size:16px;font-weight:600;color:rgba(255,255,255,.9);margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{color:rgba(255,255,255,.7);transition:color .2s ease}
.footer-links a:hover{color:#7CC5F0}
.footer-bottom{padding-top:26px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;font-size:13px;color:rgba(255,255,255,.42)}
.footer-bottom p{margin:0}

@media (max-width:1080px){
  .site-nav{display:none}
  .site-nav.is-open{display:flex;flex-direction:column;align-items:stretch;position:absolute;top:calc(100% + 10px);left:0;right:0;background:#fff;border-radius:18px;padding:16px;box-shadow:var(--shadow-pop)}
  .site-nav-toggle{display:inline-flex}
  .nav-links{flex-direction:column;gap:2px;width:100%}
  .nav-item{width:100%;justify-content:flex-start;padding:13px 8px;border-bottom:1px solid #f0f3f7}
  .nav-item.active::after{display:none}
  .nav-item.active{background:var(--brand-light);border-radius:10px}
  .btn-nav{width:100%;justify-content:center;margin-top:12px}
}
@media (max-width:960px){
  .section-pad{padding:72px 0}
  .cat-hero-grid,.topic-zone,.faq-wrap,.security-grid,.step-wrap{grid-template-columns:1fr;gap:36px}
  .cat-banner{padding:42px 0 40px}
  .cat-hero-copy h1{font-size:34px}
  .hero-photo-frame img{height:300px}
  .step-media img,.security-img img{height:360px}
  .help-feature-grid{grid-template-columns:1fr}
  .cta-grid{flex-direction:column;align-items:flex-start}
}
@media (max-width:600px){
  .container-site{padding:0 16px}
  .section-pad{padding:58px 0}
  .cat-hero-copy h1, .section-title{font-size:27px}
  .cat-hero-copy .lead{font-size:15px}
  .header-inner{min-height:68px}
  .logo-text{font-size:17px}
  .logo-icon{width:34px;height:34px;font-size:18px}
  .hero-actions .btn{width:100%}
  .hero-photo-frame img{height:230px}
  .help-item{flex-direction:column;gap:10px;padding:22px 0}
  .step-row{grid-template-columns:52px 1fr;gap:10px;padding:16px 0}
  .step-num{width:44px;height:44px}
  .step-media img,.security-img img{height:260px}
  .security-stat{flex-wrap:wrap;gap:22px}
  .topic-main-card img{height:210px}
  .topic-mini-card{grid-template-columns:104px 1fr;padding:8px}
  .topic-mini-card img{width:104px;height:96px}
  .faq-panel{padding:0 18px}
  .faq-question{grid-template-columns:34px 1fr 24px}
  .faq-answer{padding-left:0}
  .footer-cols{grid-template-columns:1fr;gap:30px;padding-bottom:30px}
}