/* roulang page: index */
:root {
    --bg: #f6f8fc;
    --dark: #0c1420;
    --brand: #2563eb;
    --brand-dark: #1d49c9;
    --accent: #14b8a6;
    --border: #e2e8f0;
    --text: #1e293b;
    --muted: #64748b;
    --radius-lg: 1.25rem;
    --radius-md: 0.875rem;
  }
  html {
    scroll-behavior: smooth;
  }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
  }
  ::selection {
    background: rgba(37, 99, 235, .14);
    color: #172554;
  }
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-track {
    background: transparent;
  }
  ::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: content-box;
  }
  ::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
    background-clip: content-box;
  }
  .wrap {
    max-width: 80rem;
    margin-inline: auto;
    padding-inline: 1rem;
  }
  @media (min-width: 640px) {
    .wrap { padding-inline: 1.25rem; }
  }
  @media (min-width: 1024px) {
    .wrap { padding-inline: 2rem; }
  }
  a:focus-visible,
  button:focus-visible,
  summary:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 3px;
    border-radius: 10px;
  }
  .badge {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    border-radius: 999px;
    padding: .3rem .8rem;
    font-size: .75rem;
    font-weight: 600;
    background: #eef4ff;
    color: #1d49c9;
    border: 1px solid #dbe6fe;
    letter-spacing: .02em;
  }
  .badge-soft {
    background: rgba(255, 255, 255, .08);
    color: #e0e7ff;
    border-color: rgba(255, 255, 255, .12);
  }
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-weight: 600;
    font-size: .95rem;
    line-height: 1.2;
    padding: .8rem 1.5rem;
    border-radius: 9999px;
    transition: all .25s ease;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none;
  }
  .btn-primary {
    background: var(--brand);
    color: #fff;
    box-shadow: 0 12px 28px -10px rgba(37, 99, 235, .5);
  }
  .btn-primary:hover {
    background: var(--brand-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px -12px rgba(37, 99, 235, .55);
  }
  .btn-white {
    background: #fff;
    color: #0c1420;
    box-shadow: 0 12px 24px -12px rgba(255, 255, 255, .25);
  }
  .btn-white:hover {
    background: #e0e7ff;
    transform: translateY(-2px);
    box-shadow: 0 16px 30px -12px rgba(255, 255, 255, .35);
  }
  .btn-outline {
    background: #fff;
    color: #1e293b;
    border-color: #d8dee8;
    box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
  }
  .btn-outline:hover {
    border-color: #93abfd;
    color: #1d49c9;
    background: #f8faff;
    transform: translateY(-2px);
    box-shadow: 0 14px 28px -14px rgba(37, 99, 235, .22);
  }
  .btn-light {
    background: rgba(255, 255, 255, .1);
    color: #fff;
    border-color: rgba(255, 255, 255, .15);
    backdrop-filter: blur(6px);
  }
  .btn-light:hover {
    background: rgba(255, 255, 255, .18);
    border-color: rgba(255, 255, 255, .28);
    transform: translateY(-2px);
  }
  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .55rem .9rem;
    font-size: .9rem;
    font-weight: 500;
    color: #334155;
    border-radius: .675rem;
    position: relative;
    white-space: nowrap;
    transition: color .2s, background .2s;
  }
  .nav-link:hover {
    color: #1d49c9;
    background: #eef4ff;
  }
  .nav-link.active {
    color: #1d4ed8;
    font-weight: 700;
  }
  .nav-link.active::after {
    content: "";
    position: absolute;
    left: .8rem;
    right: .8rem;
    bottom: -1px;
    height: 2px;
    border-radius: 4px;
    background: #2563eb;
  }
  .icon-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 1rem;
    transition: transform .25s, background .25s;
  }
  .group-card:hover .icon-box {
    transform: scale(1.06);
  }
  details.faq-item {
    border: 1px solid #e8edf4;
    border-radius: 1rem;
    background: #fff;
    padding: 1.1rem 1.25rem;
    transition: box-shadow .2s, border-color .2s;
  }
  details.faq-item:hover {
    border-color: #c7d8ff;
    box-shadow: 0 12px 28px -16px rgba(37, 99, 235, .15);
  }
  details.faq-item[open] {
    border-color: #b9d0ff;
    box-shadow: 0 16px 32px -18px rgba(37, 99, 235, .2);
  }
  details.faq-item summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-weight: 600;
    font-size: 1rem;
    color: #1e293b;
  }
  details.faq-item summary::-webkit-details-marker {
    display: none;
  }
  details.faq-item .faq-icon {
    color: #94a3b8;
    transition: transform .3s, color .3s;
  }
  details.faq-item[open] .faq-icon {
    transform: rotate(45deg);
    color: #2563eb;
  }
  .stat-grid-card {
    background: rgba(255, 255, 255, .04);
    border: 1px solid rgba(255, 255, 255, .09);
    border-radius: 1.25rem;
    padding: 1.6rem 1.4rem;
    transition: background .25s, border-color .25s;
  }
  .stat-grid-card:hover {
    background: rgba(255, 255, 255, .07);
    border-color: rgba(255, 255, 255, .16);
  }
  .card-hover {
    transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
  }
  .card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 22px 40px -18px rgba(15, 23, 42, .16);
  }
  .hero-overlay {
    background:
      radial-gradient(ellipse at 82% 20%, rgba(37, 99, 235, .5), transparent 46%),
      radial-gradient(ellipse at 12% 90%, rgba(20, 184, 166, .22), transparent 44%),
      linear-gradient(135deg, rgba(2, 6, 23, .86), rgba(15, 23, 42, .72));
  }
  @media (max-width: 640px) {
    .nav-link {
      padding: .5rem .65rem;
      font-size: .84rem;
    }
    .btn {
      font-size: .88rem;
      padding: .72rem 1.15rem;
    }
  }

/* roulang page: article */
:root {
      --brand: #3563ff;
      --accent: #06b6d4;
      --ink: #0b1220;
      --muted: #64748b;
      --bg: #f4f7fb;
      --surface: #ffffff;
      --border: #e2e8f0;
      --radius: 1rem;
      --radius-lg: 1.5rem;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);
      --shadow-md: 0 12px 30px -10px rgba(15, 23, 42, .15);
      --shadow-lg: 0 24px 50px -18px rgba(15, 23, 42, .22);
      --maxw: 80rem;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
      background-color: var(--bg);
      color: #0f172a;
      line-height: 1.6;
    }

    img,
    svg {
      display: block;
      max-width: 100%;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    button,
    input,
    summary {
      font: inherit;
    }

    :focus-visible {
      outline: 3px solid rgba(53, 99, 255, .45);
      outline-offset: 3px;
    }

    .wrap {
      width: 100%;
      max-width: var(--maxw);
      margin-inline: auto;
      padding-inline: 1.25rem;
    }

    @media (min-width: 640px) {
      .wrap {
        padding-inline: 1.75rem;
      }
    }

    @media (min-width: 1024px) {
      .wrap {
        padding-inline: 2rem;
      }
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      padding: .5rem .8rem;
      border-radius: .75rem;
      font-size: .875rem;
      font-weight: 600;
      color: #334155;
      transition: all .2s ease;
      white-space: nowrap;
      flex: 0 0 auto;
    }

    @media (min-width: 1024px) {
      .nav-link {
        padding-inline: 1rem;
      }
    }

    .nav-link:hover {
      color: #0b1220;
      background: #eef2ff;
    }

    .nav-link:active {
      transform: scale(.97);
    }

    .nav-link.active {
      color: #ffffff;
      background: #0b1220;
      box-shadow: 0 6px 14px -6px rgba(11, 18, 32, .4);
    }

    .wrap nav {
      -ms-overflow-style: none;
      scrollbar-width: none;
    }

    .wrap nav::-webkit-scrollbar {
      display: none;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: .4rem;
      border-radius: 999px;
      padding: .35rem .85rem;
      font-size: .75rem;
      font-weight: 600;
      line-height: 1.4;
    }

    .badge-soft {
      color: #cbd5e1;
      background: rgba(255, 255, 255, .06);
      border: 1px solid rgba(255, 255, 255, .1);
    }

    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      border-radius: 999px;
      padding: .45rem 1rem;
      background: #eff6ff;
      color: #1e3a8a;
      border: 1px solid #dbeafe;
      font-size: .8rem;
      font-weight: 600;
    }

    .badge-pill i {
      color: #2563eb;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      border-radius: 999px;
      padding: .4rem .9rem;
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #e2e8f0;
      font-size: .75rem;
      font-weight: 600;
      transition: all .2s ease;
    }

    .badge-tag:hover {
      background: #e0e7ff;
      color: #1e3a8a;
      border-color: #c7d2fe;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: .55rem;
      border-radius: .9rem;
      padding: .8rem 1.35rem;
      font-weight: 600;
      font-size: .9rem;
      line-height: 1.2;
      transition: all .25s ease;
      cursor: pointer;
      border: 0;
      white-space: nowrap;
    }

    .btn-icon {
      width: 2.6rem;
      height: 2.6rem;
      padding: 0;
      border-radius: .85rem;
    }

    .btn-primary {
      background: linear-gradient(135deg, #3563ff 0%, #06b6d4 100%);
      color: #fff;
      box-shadow: 0 12px 26px -10px rgba(53, 99, 255, .55);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 36px -12px rgba(53, 99, 255, .65);
    }

    .btn-primary:active {
      transform: translateY(0);
      box-shadow: 0 8px 18px -8px rgba(53, 99, 255, .5);
    }

    .btn-light {
      background: #fff;
      color: #0b1220;
      box-shadow: 0 12px 30px -14px rgba(0, 0, 0, .3);
    }

    .btn-light:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 36px -12px rgba(0, 0, 0, .35);
    }

    .btn-ghost-light {
      border: 1px solid rgba(255, 255, 255, .25);
      background: rgba(255, 255, 255, .06);
      color: #fff;
    }

    .btn-ghost-light:hover {
      background: rgba(255, 255, 255, .14);
      border-color: rgba(255, 255, 255, .4);
      transform: translateY(-1px);
    }

    .article-hero,
    .cta-panel {
      background:
        radial-gradient(circle at 80% 18%, rgba(6, 182, 212, .2), transparent 36%),
        radial-gradient(circle at 12% 82%, rgba(53, 99, 255, .18), transparent 38%),
        linear-gradient(135deg, #060d1d 0%, #0f1d3a 54%, #102c40 100%);
    }

    .meta-divider {
      width: 1px;
      height: 1rem;
      background: rgba(255, 255, 255, .2);
    }

    .article-card {
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(226, 232, 240, .86);
      background: #fff;
      border-radius: 1.5rem;
    }

    .article-body {
      color: #1e293b;
      font-size: 1.05rem;
      line-height: 1.95;
      word-break: break-word;
    }

    .article-body > * + * {
      margin-top: 1.15rem;
    }

    .article-body p {
      margin: 1.15em 0;
    }

    .article-body h1,
    .article-body h2,
    .article-body h3,
    .article-body h4 {
      color: #0b1220;
      font-weight: 700;
      line-height: 1.4;
      margin: 1.8em 0 .7em;
    }

    .article-body h2 {
      font-size: 1.55rem;
    }

    .article-body h3 {
      font-size: 1.25rem;
    }

    .article-body ul,
    .article-body ol {
      margin: 1.2em 0;
      padding-left: 1.4rem;
    }

    .article-body ul {
      list-style: disc;
    }

    .article-body ol {
      list-style: decimal;
    }

    .article-body li {
      margin: .45em 0;
    }

    .article-body img {
      max-width: 100%;
      height: auto;
      border-radius: 1rem;
      margin: 1.6rem auto;
      box-shadow: var(--shadow-md);
    }

    .article-body a {
      color: #2563eb;
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .article-body a:hover {
      color: #1e3a8a;
    }

    .article-body blockquote {
      margin: 1.6rem 0;
      padding: 1rem 1.3rem;
      border-left: 4px solid #2563eb;
      background: #f8fafc;
      border-radius: 0 .75rem .75rem 0;
      color: #334155;
    }

    .article-body table {
      width: 100%;
      border-collapse: collapse;
      margin: 1.5rem 0;
      display: block;
      overflow-x: auto;
      font-size: .95rem;
    }

    .article-body th,
    .article-body td {
      border: 1px solid #e2e8f0;
      padding: .7rem .9rem;
      text-align: left;
      vertical-align: top;
    }

    .article-body th {
      background: #f1f5f9;
      font-weight: 700;
      color: #0f172a;
    }

    .tip-grid {
      display: grid;
      grid-template-columns: repeat(1, 1fr);
      gap: 1rem;
    }

    @media (min-width: 768px) {
      .tip-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    .tip-card {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 1.25rem;
      padding: 1.5rem;
      transition: all .25s ease;
    }

    .tip-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #c7d2fe;
    }

    .faq-item {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 1.25rem;
      box-shadow: 0 1px 2px rgba(15, 23, 42, .03);
      transition: border-color .25s ease, box-shadow .25s ease;
      overflow: hidden;
    }

    .faq-item[open] {
      border-color: #bfdbfe;
      box-shadow: 0 16px 34px -20px rgba(15, 23, 42, .18);
    }

    .faq-item summary {
      list-style: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 1.15rem 1.35rem;
      font-weight: 700;
      color: #0b1220;
      font-size: .98rem;
      transition: background .2s ease;
      user-select: none;
    }

    .faq-item summary::-webkit-details-marker {
      display: none;
    }

    .faq-item summary::after {
      content: "\f078";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      font-size: .8rem;
      color: #94a3b8;
      transition: transform .3s ease, color .2s ease;
      flex: 0 0 auto;
    }

    .faq-item[open] > summary::after {
      transform: rotate(180deg);
      color: #2563eb;
    }

    .faq-item summary:hover {
      background: #f8fafc;
    }

    .faq-panel {
      padding: .15rem 1.35rem 1.25rem;
      color: #475569;
      font-size: .95rem;
      line-height: 1.85;
      border-top: 1px dashed #e2e8f0;
    }

    .faq-panel p {
      margin: .9rem 0 0;
    }

    .channel-card {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 1.5rem;
      padding: 1.7rem;
      position: relative;
      overflow: hidden;
      transition: all .3s ease;
    }

    .channel-card:hover {
      -webkit-transform: translateY(-5px);
              transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: #c7d2fe;
    }

    .channel-card::before {
      content: "";
      position: absolute;
      inset: 0 0 auto;
      height: 4px;
      background: linear-gradient(90deg, #3563ff, #06b6d4);
      opacity: 0;
      transition: opacity .3s ease;
    }

    .channel-card:hover::before {
      opacity: 1;
    }

    .channel-icon {
      width: 3rem;
      height: 3rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 1rem;
      background: linear-gradient(135deg, rgba(53, 99, 255, .12), rgba(6, 182, 212, .12));
      color: #2563eb;
      font-size: 1.15rem;
      transition: all .3s ease;
    }

    .channel-card:hover .channel-icon {
      background: linear-gradient(135deg, #3563ff, #06b6d4);
      color: #fff;
      box-shadow: 0 10px 22px -8px rgba(53, 99, 255, .55);
    }

    .cover-pop {
      box-shadow: var(--shadow-lg);
      border-radius: 1.5rem;
      overflow: hidden;
      transform: rotate(1.2deg);
      transition: transform .4s ease, box-shadow .4s ease;
    }

    .cover-pop:hover {
      transform: rotate(0deg) scale(1.015);
      box-shadow: 0 32px 70px -20px rgba(15, 23, 42, .35);
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition: none !important;
        transform: none !important;
      }
    }

/* roulang page: category1 */
:root {
    --bg-page: #f6f8fb;
    --ink: #0f172a;
    --muted: #5b6b81;
    --line: #e3e9f2;
    --brand: #2d54e0;
    --accent: #0da5c4;
    --dark: #0b1220;
    --radius: 1.25rem;
  }

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg-page);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  ::selection { background: #dbe7ff; color: #1f2f78; }

  .wrap {
    width: min(1140px, 100% - 2rem);
    margin-inline: auto;
  }

  a:focus-visible,
  button:focus-visible,
  summary:focus-visible,
  .btn:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 3px;
    border-radius: 6px;
  }

  /* Navigation */
  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    height: 100%;
    padding: 0 .85rem;
    font-size: .9rem;
    font-weight: 600;
    white-space: nowrap;
    color: #3f536c;
    box-shadow: inset 0 -2px 0 transparent;
    transition: color .2s ease, background-color .2s ease, box-shadow .2s ease;
  }

  .nav-link i {
    color: #7b90ae;
    transition: color .2s ease;
  }

  .nav-link:hover {
    color: var(--brand);
    background: rgba(45, 84, 224, .04);
  }

  .nav-link:hover i {
    color: var(--brand);
  }

  .nav-link.active {
    color: var(--brand);
    box-shadow: inset 0 -2px 0 var(--brand);
  }

  .nav-link.active i {
    color: var(--brand);
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    border-radius: 999px;
    padding: .82rem 1.4rem;
    font-size: .94rem;
    font-weight: 700;
    line-height: 1;
    transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease, border-color .2s ease;
    cursor: pointer;
  }

  .btn-primary {
    background: linear-gradient(135deg, #3564e8, #0da5c4);
    color: #fff;
    box-shadow: 0 12px 28px -12px rgba(45, 84, 224, .55);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px -12px rgba(45, 84, 224, .65);
  }

  .btn-ghost-light {
    border: 1px solid rgba(255, 255, 255, .22);
    background: rgba(255, 255, 255, .06);
    color: #fff;
  }

  .btn-ghost-light:hover {
    background: rgba(255, 255, 255, .12);
    transform: translateY(-2px);
  }

  .btn-outline {
    border: 1px solid var(--line);
    background: #fff;
    color: #26399f;
  }

  .btn-outline:hover {
    border-color: rgba(45, 84, 224, .4);
    background: #f3f6fd;
    transform: translateY(-2px);
  }

  /* Cards */
  .card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: 0 8px 24px -20px rgba(15, 23, 42, .35);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    border-color: #cfdbea;
    box-shadow: 0 22px 42px -24px rgba(15, 23, 42, .3);
  }

  .step-card {
    border: 1px solid rgba(255, 255, 255, .1);
    background: rgba(255, 255, 255, .045);
    border-radius: 1.4rem;
    transition: background-color .25s ease, border-color .25s ease, transform .25s ease;
  }

  .step-card:hover {
    background: rgba(255, 255, 255, .08);
    border-color: rgba(13, 165, 196, .4);
    transform: translateY(-3px);
  }

  .badge-soft {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .4rem .8rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, .08);
    color: #cbd5e1;
    font-size: .75rem;
    font-weight: 600;
    line-height: 1.2;
  }

  .glass-metric {
    border: 1px solid rgba(255, 255, 255, .1);
    background: rgba(255, 255, 255, .06);
    border-radius: 1.1rem;
    backdrop-filter: blur(8px);
    transition: background-color .2s ease, border-color .2s ease;
  }

  .glass-metric:hover {
    background: rgba(255, 255, 255, .1);
    border-color: rgba(255, 255, 255, .2);
  }

  .icon-square {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.6rem;
    height: 2.6rem;
    border-radius: .8rem;
    background: linear-gradient(135deg, rgba(45, 84, 224, .12), rgba(13, 165, 196, .12));
    color: var(--brand);
    font-size: 1.1rem;
  }

  .dark .icon-square,
  .text-white .icon-square {
    background: rgba(255, 255, 255, .1);
    color: #fff;
  }

  /* FAQ */
  .faq-item {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 1rem;
    overflow: hidden;
    transition: border-color .2s ease, box-shadow .2s ease;
  }

  .faq-item:hover {
    border-color: #c9d6e8;
  }

  .faq-item[open] {
    border-color: rgba(45, 84, 224, .35);
    box-shadow: 0 12px 30px -24px rgba(15, 23, 42, .3);
  }

  .faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    list-style: none;
    padding: 1.1rem 1.2rem;
    font-weight: 700;
    font-size: .96rem;
    color: var(--ink);
    cursor: pointer;
    transition: color .2s ease;
  }

  .faq-item summary::-webkit-details-marker {
    display: none;
  }

  .faq-item summary i {
    color: #8ba0bb;
    transition: transform .3s ease, color .2s ease;
  }

  .faq-item[open] summary {
    color: var(--brand);
  }

  .faq-item[open] summary i {
    transform: rotate(180deg);
    color: var(--brand);
  }

  .faq-answer {
    padding: 0 1.25rem 1.25rem;
    font-size: .93rem;
    line-height: 1.9;
    color: var(--muted);
  }

  /* Backgrounds */
  .hero-grid-bg {
    background-image:
      linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
    background-size: 42px 42px;
  }

  .glow-orb {
    position: absolute;
    width: 380px;
    height: 380px;
    border-radius: 9999px;
    background: radial-gradient(circle, rgba(45, 84, 224, .5), rgba(13, 165, 196, .12) 60%, transparent 72%);
    filter: blur(70px);
    pointer-events: none;
  }

  .section-kicker {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    border-radius: 999px;
    padding: .35rem .85rem;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .04em;
    background: rgba(45, 84, 224, .08);
    color: var(--brand);
  }

  .dark .section-kicker {
    background: rgba(255, 255, 255, .08);
    color: #7ddbe8;
  }

  .section-title {
    font-size: 1.7rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -.02em;
    color: var(--ink);
  }

  .text-white .section-title,
  .dark .section-title {
    color: #fff;
  }

  .section-subtitle {
    margin-top: .9rem;
    font-size: 1rem;
    line-height: 1.9;
    color: var(--muted);
  }

  .text-white .section-subtitle,
  .dark .section-subtitle {
    color: #a6b5cd;
  }

  @media (min-width: 640px) {
    .section-title {
      font-size: 2.05rem;
    }
  }

/* roulang page: category2 */
:root {
            --bg-dark: #0b1220;
            --brand-600: #2563eb;
            --text-main: #0f172a;
            --text-weak: #64748b;
            --border-light: #e2e8f0;
            --radius-xl: 1.25rem;
            --shadow-card: 0 10px 30px rgba(15, 23, 42, .07);
            --shadow-hover: 0 18px 40px rgba(15, 23, 42, .12);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            background: #f8fafc;
            color: var(--text-main);
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        button,
        input,
        textarea {
            font: inherit;
        }
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--brand-600);
            outline-offset: 3px;
            border-radius: 6px;
        }
        .wrap {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: clamp(1rem, 4vw, 2rem);
            padding-right: clamp(1rem, 4vw, 2rem);
        }
        .section {
            padding: 5rem 0;
        }
        .section-head {
            max-width: 760px;
            margin: 0 auto 3rem;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
            padding: .45rem 1rem;
            border-radius: 9999px;
            font-size: .88rem;
            font-weight: 500;
            color: #475569;
            border: 1px solid transparent;
            transition: all .22s ease;
            white-space: nowrap;
        }
        .nav-link i {
            font-size: .8rem;
            color: #64748b;
            transition: color .22s ease;
        }
        .nav-link:hover {
            background: #f1f5f9;
            color: #0f172a;
            transform: translateY(-1px);
        }
        .nav-link:hover i {
            color: #2563eb;
        }
        .nav-link.active {
            background: #eff6ff;
            color: #1d4ed8;
            box-shadow: inset 0 0 0 1px #bfdbfe;
        }
        .nav-link.active i {
            color: #2563eb;
        }
        .badge-soft {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            border-radius: 9999px;
            border: 1px solid rgb(255 255 255 / .12);
            background: rgb(255 255 255 / .06);
            padding: .4rem .8rem;
            font-size: .8rem;
            color: #cbd5e1;
        }
        .badge-blue {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            border-radius: 9999px;
            background: #eff6ff;
            color: #1d4ed8;
            padding: .35rem .8rem;
            font-size: .8rem;
            font-weight: 600;
        }
        .card-grid {
            display: grid;
            gap: 1.6rem;
            grid-template-columns: repeat(3, 1fr);
        }
        .content-card {
            background: #fff;
            border: 1px solid #eef2f7;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            transition: transform .25s ease, box-shadow .25s ease;
            overflow: hidden;
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .card-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.8rem;
            height: 2.8rem;
            border-radius: .9rem;
            background: rgba(37, 99, 235, .1);
            color: #2563eb;
            font-size: 1.05rem;
            flex-shrink: 0;
        }
        .gradient-text {
            background: linear-gradient(92deg, #0b1220, #2563eb 70%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .dark-gradient-text {
            background: linear-gradient(92deg, #ffffff, #7dd3fc);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-bg {
            background-size: cover;
            background-position: center;
        }
        .hero-overlay {
            background: linear-gradient(120deg, rgba(11, 18, 32, .96) 0%, rgba(15, 23, 42, .88) 46%, rgba(15, 23, 42, .66) 100%);
        }
        @media(max-width:1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media(max-width:640px) {
            .section {
                padding: 3.5rem 0;
            }
            .section-head {
                margin-bottom: 2rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category3 */
:root {
    --brand-600: #2563eb;
    --brand-700: #1d4ed8;
    --accent-500: #06b6d4;
    --deep-bg: #0b1220;
    --soft-bg: #f4f7fb;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-body: #475569;
    --text-weak: #94a3b8;
    --border-soft: #e2e8f0;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-card: 0 18px 40px -22px rgba(2, 6, 23, .18);
    --shadow-hover: 0 24px 50px -22px rgba(2, 6, 23, .26);
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
  body {
    margin: 0;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--soft-bg);
    color: var(--text-body);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
  button, input, textarea { font: inherit; }
  :focus-visible { outline: 3px solid rgba(37, 99, 235, .45); outline-offset: 3px; border-radius: 4px; }

  .wrap {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  .no-scrollbar::-webkit-scrollbar { display: none; }
  .no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

  /* 顶部导航 */
  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .6rem 1rem;
    font-size: .875rem;
    font-weight: 500;
    color: #334155;
    border-radius: 12px;
    transition: background .2s ease, color .2s ease, transform .2s ease;
    white-space: nowrap;
  }
  .nav-link i { font-size: .85rem; opacity: .8; }
  .nav-link:hover { background: #f1f5f9; color: #0f172a; }
  .nav-link.active {
    background: linear-gradient(135deg, #2563eb, #0891b2);
    color: #ffffff;
    box-shadow: 0 8px 20px -10px rgba(37, 99, 235, .65);
    font-weight: 600;
  }
  .nav-link.active i { opacity: 1; }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .35rem .75rem;
    font-size: .72rem;
    line-height: 1.4;
    border-radius: 999px;
    border: 1px solid var(--border-soft);
    background: #f8fafc;
    color: #475569;
    white-space: nowrap;
  }
  .badge-soft {
    background: rgba(255, 255, 255, .08);
    border-color: rgba(255, 255, 255, .12);
    color: #cbd5e1;
  }

  /* Hero 区 */
  .tech-hero {
    background:
      linear-gradient(120deg, rgba(11, 18, 32, .97) 8%, rgba(13, 42, 76, .92) 45%, rgba(16, 71, 84, .86) 90%),
      url('/assets/images/backpic/back-2.png') center / cover no-repeat;
    background-color: #0b1220;
  }
  .hero-panel {
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .14);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    box-shadow: 0 30px 70px -28px rgba(0, 0, 0, .72);
  }
  .dot-grid {
    background-image: radial-gradient(rgba(255, 255, 255, .18) 1px, transparent 1px);
    background-size: 16px 16px;
  }
  .status-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .75rem;
    padding: .9rem .95rem;
    border-radius: 14px;
    background: rgba(255, 255, 255, .055);
    border: 1px solid rgba(255, 255, 255, .1);
  }

  /* 页面卡片 */
  .soft-card {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  }
  .soft-card:hover {
    transform: translateY(-4px);
    border-color: #c7d7fe;
    box-shadow: var(--shadow-hover);
  }
  .portal-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    color: #ffffff;
    font-size: 1.15rem;
    background: linear-gradient(145deg, #2563eb, #06b6d4);
    box-shadow: 0 12px 24px -12px rgba(37, 99, 235, .7);
  }
  .cover-card .cover-img {
    height: 0;
    padding-top: 62%;
    position: relative;
    overflow: hidden;
    border-radius: 14px 14px 0 0;
  }
  .cover-card .cover-img img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  /* 按钮 */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    background: linear-gradient(135deg, #2563eb, #0891b2);
    color: #fff;
    font-weight: 600;
    border-radius: 12px;
    padding: .85rem 1.6rem;
    border: none;
    box-shadow: 0 16px 30px -18px rgba(37, 99, 235, .85);
    transition: transform .2s ease, box-shadow .2s ease, filter .2s ease;
    cursor: pointer;
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 22px 38px -18px rgba(37, 99, 235, .95); filter: brightness(1.06); }
  .btn-primary:active { transform: translateY(0); }

  .btn-outline-light {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .25);
    color: #e2e8f0;
    font-weight: 500;
    border-radius: 12px;
    padding: .85rem 1.6rem;
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
    backdrop-filter: blur(8px);
    cursor: pointer;
  }
  .btn-outline-light:hover { background: rgba(255, 255, 255, .16); border-color: rgba(255, 255, 255, .45); transform: translateY(-2px); }
  .btn-outline-light:active { transform: translateY(0); }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    background: transparent;
    border: 1px solid #bcd0f2;
    color: #1e3a8a;
    font-weight: 600;
    border-radius: 12px;
    padding: .8rem 1.5rem;
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
    cursor: pointer;
  }
  .btn-outline:hover { background: #eff6ff; border-color: #93b4f5; transform: translateY(-2px); }

  /* 分区标签 */
  .section-label {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .12em;
    padding: .4rem .9rem;
    border-radius: 999px;
    background: #ecf2ff;
    color: #1d4ed8;
    border: 1px solid #d8e5ff;
  }
  .section-label-dark {
    background: rgba(255, 255, 255, .1);
    color: #bae6fd;
    border-color: rgba(255, 255, 255, .16);
  }

  /* FAQ */
  .faq-item {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 20px -18px rgba(2, 6, 23, .1);
    transition: box-shadow .25s ease, border-color .25s ease;
  }
  .faq-item:hover { box-shadow: var(--shadow-card); border-color: #c9d9fe; }
  .faq-item summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 1.35rem;
    font-weight: 600;
    color: #0f172a;
    transition: background .2s ease;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-item summary:hover { background: #f8fbff; }
  .faq-item[open] summary { border-bottom: 1px solid #eef2f7; }
  .faq-item .faq-icon {
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #eff6ff;
    color: #2563eb;
    transition: transform .25s ease, background .25s ease;
  }
  .faq-item[open] .faq-icon { transform: rotate(45deg); background: #1e3a8a; color: #fff; }
  .faq-item .faq-body { padding: 1rem 1.35rem 1.4rem; color: #475569; font-size: .95rem; }

  /* 时间线步骤 */
  .step-list { counter-reset: step; }
  .step-list .step-item {
    position: relative;
    display: flex;
    gap: 1rem;
    padding: 0 0 1.7rem;
    counter-increment: step;
  }
  .step-list .step-item:before {
    content: counter(step, decimal-leading-zero);
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    font-weight: 800;
    font-size: .85rem;
    background: rgba(37, 99, 235, .14);
    border: 1px solid rgba(37, 99, 235, .3);
    color: #bae6fd;
  }
  .step-list .step-item:not(:last-child)::after {
    content: "";
    position: absolute;
    left: 23px;
    top: 54px;
    bottom: 6px;
    width: 1px;
    background: rgba(255, 255, 255, .18);
  }

  /* 分割装饰 */
  .divider-light { height: 1px; border: none; background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .18), transparent); }

  main { flex: 1; }

  @media (max-width: 767px) {
    .wrap { padding-left: 1rem; padding-right: 1rem; }
    .step-list .step-item { padding-bottom: 1.25rem; }
    .step-list .step-item:before { width: 40px; height: 40px; font-size: .78rem; }
    .step-list .step-item:not(:last-child)::after { left: 20px; }
  }