/* roulang page: index */
:root {
  --color-ink-900: #0F2A43;
  --color-ink-700: #1B3A5C;
  --color-coral-500: #E5784F;
  --color-coral-700: #C95B34;
  --color-paper: #F8F7F2;
  --color-line: #E8E5DC;
}
@layer base {
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
  }
  body {
    font-family: 'PingFang SC', 'HarmonyOS Sans', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
    background-color: var(--color-paper);
    color: var(--color-ink-900);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }
  a {
    color: inherit;
    text-decoration: none;
    transition: color .25s ease;
  }
  button {
    font-family: inherit;
  }
  .container-lg {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 24px;
    padding-right: 24px;
  }
  @media (min-width: 768px) {
    .container-lg {
      padding-left: 48px;
      padding-right: 48px;
    }
  }
  .card-base {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(15,42,67,.04);
    transition: box-shadow .3s cubic-bezier(.4,0,.2,1), transform .3s cubic-bezier(.4,0,.2,1), border-color .3s ease;
  }
  .card-base:hover {
    box-shadow: 0 16px 32px rgba(15,42,67,.10);
    transform: translateY(-2px);
    border-color: rgba(229,120,79,.4);
  }
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-coral-500);
    color: #fff;
    font-weight: 700;
    padding: 14px 28px;
    border-radius: 10px;
    transition: all .3s cubic-bezier(.4,0,.2,1);
    cursor: pointer;
    border: none;
    line-height: 1.2;
  }
  .btn-primary:hover {
    background: var(--color-coral-700);
    box-shadow: 0 8px 24px rgba(229,120,79,.35);
    transform: translateY(-2px);
  }
  .btn-primary:active {
    transform: scale(.98);
  }
  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: transparent;
    color: var(--color-ink-900);
    font-weight: 700;
    padding: 14px 28px;
    border-radius: 10px;
    border: 1px solid var(--color-ink-900);
    transition: all .3s cubic-bezier(.4,0,.2,1);
    cursor: pointer;
    line-height: 1.2;
  }
  .btn-secondary:hover {
    background: var(--color-ink-900);
    color: #fff;
    border-color: var(--color-ink-900);
  }
  .btn-secondary:active {
    transform: scale(.98);
  }
  .btn-lg {
    padding: 18px 42px;
    font-size: 17px;
    border-radius: 12px;
  }
  .badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-coral-700);
    background: rgba(229,120,79,.10);
    border-radius: 999px;
    line-height: 1.4;
  }
  .hover-shadow-lift {
    transition: box-shadow .3s cubic-bezier(.4,0,.2,1), transform .3s cubic-bezier(.4,0,.2,1), border-color .3s ease;
  }
  .hover-shadow-lift:hover {
    box-shadow: 0 16px 32px rgba(15,42,67,.10);
    transform: translateY(-2px);
    border-color: rgba(229,120,79,.4);
  }
  .nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    color: rgba(255,255,255,.60);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    transition: all .25s ease;
  }
  .nav-item:hover {
    color: #fff;
    background: rgba(255,255,255,.05);
  }
  .nav-item.active {
    color: #fff;
    background: rgba(255,255,255,.05);
  }
  .nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--color-coral-500);
    border-radius: 0 3px 3px 0;
  }
  .hero-backdrop {
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
  }
  .carousel-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #fff;
    color: var(--color-ink-900);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(15,42,67,.08);
    transition: all .3s ease;
    border: none;
    cursor: pointer;
  }
  .carousel-btn:hover {
    background: var(--color-coral-500);
    color: #fff;
  }
  .carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(15,42,67,.40);
    transition: all .3s ease;
    border: none;
    cursor: pointer;
    padding: 0;
  }
  .carousel-dot.active {
    background: rgba(15,42,67,1);
    width: 24px;
    border-radius: 999px;
  }
  .carousel-slide {
    min-width: 100%;
  }
  .testimonial-card {
    break-inside: avoid;
    margin-bottom: 24px;
  }
  .line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  section[id] {
    scroll-margin-top: 70px;
  }
}

/* roulang page: article */
* { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: 'PingFang SC', 'HarmonyOS Sans', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    background-color: #F8F7F2;
    color: #0F2A43;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }
  img { max-width: 100%; height: auto; display: block; }
  a { color: inherit; text-decoration: none; transition: color .25s cubic-bezier(.4,0,.2,1); }
  button { cursor: pointer; font-family: inherit; }

  .container-lg {
    max-width: 1280px;
    margin: 0 auto;
    padding-left: 48px;
    padding-right: 48px;
  }

  .card-base {
    border-radius: 16px;
    border: 1px solid #E8E5DC;
    background: #fff;
    box-shadow: 0 2px 8px rgba(15,42,67,.04);
    transition: box-shadow .25s cubic-bezier(.4,0,.2,1), transform .25s cubic-bezier(.4,0,.2,1);
  }
  .card-base:hover {
    box-shadow: 0 16px 32px rgba(15,42,67,.10);
    transform: translateY(-2px);
  }

  .btn-primary {
    background-color: #E5784F;
    color: #fff;
    border-radius: 10px;
    padding: 14px 28px;
    font-weight: 700;
    font-size: 16px;
    display: inline-block;
    text-align: center;
    border: 0;
    transition: background-color .25s cubic-bezier(.4,0,.2,1), box-shadow .25s cubic-bezier(.4,0,.2,1), transform .25s cubic-bezier(.4,0,.2,1);
    cursor: pointer;
  }
  .btn-primary:hover { background-color: #C95B34; box-shadow: 0 8px 24px rgba(229,120,79,.30); }
  .btn-primary:active { transform: scale(.98); }

  .btn-secondary {
    background: transparent;
    border: 1px solid #0F2A43;
    color: #0F2A43;
    border-radius: 10px;
    padding: 14px 28px;
    font-weight: 700;
    font-size: 16px;
    display: inline-block;
    text-align: center;
    transition: background-color .25s cubic-bezier(.4,0,.2,1), color .25s cubic-bezier(.4,0,.2,1), transform .25s cubic-bezier(.4,0,.2,1);
    cursor: pointer;
  }
  .btn-secondary:hover { background: #0F2A43; color: #fff; }
  .btn-secondary:active { transform: scale(.98); }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 10px;
    color: rgba(255,255,255,.6);
    transition: all .25s cubic-bezier(.4,0,.2,1);
    border-left: 3px solid transparent;
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
  }
  .nav-item:hover { color: #fff; background: rgba(255,255,255,.05); }
  .nav-item.active { color: #fff; background: rgba(255,255,255,.05); border-left-color: #E5784F; }

  .badge {
    display: inline-block;
    background: rgba(229,120,79,.10);
    color: #C95B34;
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
  }

  .article-body { font-size: 17px; line-height: 1.9; color: #374151; word-break: break-word; }
  .article-body h2 {
    font-size: 24px; font-weight: 700; color: #0F2A43;
    margin-top: 40px; margin-bottom: 16px; line-height: 1.4;
  }
  .article-body h3 {
    font-size: 19px; font-weight: 600; color: #0F2A43;
    margin-top: 28px; margin-bottom: 12px;
  }
  .article-body p { margin-bottom: 20px; }
  .article-body img {
    max-width: 100%; border-radius: 12px; margin: 24px auto;
    border: 1px solid #E8E5DC;
  }
  .article-body blockquote {
    border-left: 4px solid #E5784F; background: #F8F7F2;
    padding: 16px 24px; border-radius: 0 12px 12px 0; margin: 24px 0;
  }
  .article-body ul, .article-body ol { margin: 20px 0; padding-left: 24px; }
  .article-body li { margin-bottom: 8px; }
  .article-body a { color: #E5784F; text-decoration: underline; }
  .article-body table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
  .article-body th, .article-body td { border: 1px solid #E8E5DC; padding: 10px 14px; text-align: left; }
  .article-body th { background: #F8F7F2; font-weight: 600; color: #0F2A43; }
  .article-body code {
    background: #F0EEE8; padding: 2px 6px; border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, monospace; font-size: 14px;
  }

  @media (max-width: 1023px) {
    .container-lg { padding-left: 24px; padding-right: 24px; }
  }
  @media (max-width: 767px) {
    .container-lg { padding-left: 16px; padding-right: 16px; }
    .btn-primary, .btn-secondary { width: 100%; }
  }

/* roulang page: category1 */
:root {
      --color-ink-900: #0F2A43;
      --color-coral-500: #E5784F;
      --color-coral-700: #C95B34;
      --color-paper: #F8F7F2;
      --color-line: #E8E5DC;
      --radius-card: 16px;
      --shadow-card: 0 2px 8px rgba(15, 42, 67, .04);
      --shadow-card-hover: 0 16px 32px rgba(15, 42, 67, .10);
      --ease-standard: cubic-bezier(.4, 0, .2, 1);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background: var(--color-paper);
      color: var(--color-ink-900);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
    }

    a:focus-visible,
    button:focus-visible {
      outline: 3px solid rgba(229, 120, 79, .4);
      outline-offset: 2px;
      border-radius: 8px;
    }

    .container-lg {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 48px;
      padding-right: 48px;
    }

    @media (max-width: 1023px) {
      .container-lg {
        padding-left: 24px;
        padding-right: 24px;
      }
    }

    @media (max-width: 767px) {
      .container-lg {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 14px;
      border-radius: 10px;
      color: rgba(255, 255, 255, .6);
      font-size: 15px;
      transition: background-color .25s var(--ease-standard), color .25s var(--ease-standard), box-shadow .25s var(--ease-standard);
    }

    .nav-item:hover {
      color: #fff;
      background: rgba(255, 255, 255, .06);
    }

    .nav-item.active {
      color: #fff;
      background: rgba(255, 255, 255, .05);
      box-shadow: inset 3px 0 0 var(--color-coral-500);
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--color-coral-500);
      color: #fff;
      font-weight: 700;
      padding: 14px 28px;
      border-radius: 10px;
      border: none;
      box-shadow: 0 8px 20px rgba(229, 120, 79, .25);
      transition: background-color .25s var(--ease-standard), box-shadow .25s var(--ease-standard), transform .15s var(--ease-standard);
    }

    .btn-primary:hover {
      background: var(--color-coral-700);
      box-shadow: 0 12px 28px rgba(201, 91, 52, .30);
    }

    .btn-primary:active {
      transform: scale(.98);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: transparent;
      color: var(--color-ink-900);
      font-weight: 700;
      padding: 14px 28px;
      border-radius: 10px;
      border: 1px solid var(--color-ink-900);
      transition: background-color .25s var(--ease-standard), color .25s var(--ease-standard), border-color .25s var(--ease-standard);
    }

    .btn-secondary:hover {
      background: var(--color-ink-900);
      color: #fff;
      border-color: var(--color-ink-900);
    }

    .btn-secondary:active {
      transform: scale(.98);
    }

    .btn-white-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: rgba(255, 255, 255, .08);
      color: #fff;
      font-weight: 700;
      padding: 14px 28px;
      border-radius: 10px;
      border: 1px solid rgba(255, 255, 255, .5);
      transition: background-color .25s var(--ease-standard), color .25s var(--ease-standard), border-color .25s var(--ease-standard);
    }

    .btn-white-outline:hover {
      background: #fff;
      color: var(--color-ink-900);
      border-color: #fff;
    }

    .card-base {
      background: #fff;
      border: 1px solid var(--color-line);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform .25s var(--ease-standard), box-shadow .25s var(--ease-standard), border-color .25s var(--ease-standard);
    }

    .hover-shadow-lift:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(229, 120, 79, .35);
    }

    .badge-coral {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(229, 120, 79, .10);
      color: var(--color-coral-700);
      border-radius: 999px;
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 600;
    }

    .step-number {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1;
      color: var(--color-coral-500);
      letter-spacing: -0.02em;
    }

    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height .35s var(--ease-standard);
    }

    .faq-item.open .faq-content {
      max-height: 320px;
    }

    .faq-icon {
      transition: transform .3s var(--ease-standard);
    }

    .faq-item.open .faq-icon {
      transform: rotate(180deg);
    }

    .gallery-dot {
      width: 10px;
      height: 10px;
      border-radius: 999px;
      background: rgba(15, 42, 67, .4);
      transition: background-color .25s var(--ease-standard);
    }

    .gallery-dot.active {
      background: var(--color-ink-900);
    }

/* roulang page: category3 */
:root {
            --color-ink-900: #0F2A43;
            --color-ink-800: #16354F;
            --color-coral-500: #E5784F;
            --color-coral-700: #C95B34;
            --color-paper: #F8F7F2;
            --color-line: #E8E5DC;
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'HarmonyOS Sans', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: var(--color-paper);
            color: var(--color-ink-900);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }

        .container-lg {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 48px;
            padding-right: 48px;
        }
        @media (max-width: 1023px) and (min-width: 768px) {
            .container-lg {
                padding-left: 24px;
                padding-right: 24px;
            }
        }
        @media (max-width: 767px) {
            .container-lg {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .card-base {
            background: #fff;
            border: 1px solid var(--color-line);
            border-radius: 16px;
            box-shadow: 0 2px 8px rgba(15, 42, 67, 0.04);
            transition: transform .25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow .25s cubic-bezier(0.4, 0, 0.2, 1), border-color .25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-base:hover {
            box-shadow: 0 16px 32px rgba(15, 42, 67, 0.10);
            transform: translateY(-2px);
            border-color: rgba(229, 120, 79, 0.35);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--color-coral-500);
            color: #fff;
            font-weight: 700;
            border-radius: 10px;
            padding: 14px 28px;
            transition: background .25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow .25s cubic-bezier(0.4, 0, 0.2, 1), transform .15s;
        }
        .btn-primary:hover {
            background: var(--color-coral-700);
            box-shadow: 0 10px 26px rgba(229, 120, 79, 0.38);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: transparent;
            border: 1px solid var(--color-ink-900);
            color: var(--color-ink-900);
            font-weight: 600;
            border-radius: 10px;
            padding: 14px 28px;
            transition: background .25s cubic-bezier(0.4, 0, 0.2, 1), color .25s cubic-bezier(0.4, 0, 0.2, 1), transform .15s;
        }
        .btn-secondary:hover {
            background: var(--color-ink-900);
            color: #fff;
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.625rem 1rem;
            border-radius: 0.5rem;
            color: rgba(255, 255, 255, 0.6);
            transition: all .25s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            font-size: 0.9rem;
            font-weight: 500;
            white-space: nowrap;
        }
        .nav-item:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
        }
        .nav-item.active {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 60%;
            background: var(--color-coral-500);
            border-radius: 0 4px 4px 0;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: 999px;
            background: rgba(229, 120, 79, 0.10);
            color: var(--color-coral-700);
            font-size: 0.8rem;
            font-weight: 600;
        }

        .section-label {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            background: rgba(229, 120, 79, 0.10);
            color: var(--color-coral-700);
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.02em;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--color-line);
            border-radius: 16px;
            overflow: hidden;
            transition: box-shadow .25s cubic-bezier(0.4, 0, 0.2, 1), border-color .25s;
        }
        .faq-item:hover {
            box-shadow: 0 8px 24px rgba(15, 42, 67, 0.06);
            border-color: rgba(229, 120, 79, 0.3);
        }
        .faq-item.open {
            border-color: rgba(229, 120, 79, 0.4);
            box-shadow: 0 8px 28px rgba(15, 42, 67, 0.08);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            background: transparent;
            border: none;
            text-align: left;
            color: var(--color-ink-900);
            font-weight: 600;
            font-size: 1.06rem;
            line-height: 1.5;
            transition: background .2s;
        }
        .faq-question:hover {
            background: rgba(248, 247, 242, 0.6);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-answer-inner {
            padding: 0 24px 22px;
            color: #4a5568;
            font-size: 0.96rem;
            line-height: 1.85;
        }
        .chevron {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            color: var(--color-coral-500);
            transition: transform .3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-item.open .chevron {
            transform: rotate(180deg);
        }

        .faq-cat-link {
            display: flex;
            align-items: center;
            padding: 10px 14px;
            border-radius: 10px;
            font-size: 0.92rem;
            font-weight: 500;
            color: #6b7280;
            transition: all .2s cubic-bezier(0.4, 0, 0.2, 1);
            border-left: 3px solid transparent;
        }
        .faq-cat-link:hover {
            background: rgba(229, 120, 79, 0.06);
            color: var(--color-ink-900);
        }
        .faq-cat-link.active {
            background: rgba(229, 120, 79, 0.10);
            color: var(--color-ink-900);
            border-left-color: var(--color-coral-500);
            font-weight: 600;
        }

        .step-item {
            position: relative;
            padding: 32px 28px;
            background: #fff;
            border: 1px solid var(--color-line);
            border-radius: 16px;
            box-shadow: 0 2px 8px rgba(15, 42, 67, 0.03);
            transition: transform .25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow .25s;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px rgba(15, 42, 67, 0.10);
        }
        .step-num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-coral-500);
            line-height: 1;
            margin-bottom: 16px;
        }

        .stat-card {
            background: #fff;
            border: 1px solid var(--color-line);
            border-radius: 16px;
            padding: 32px 28px;
            box-shadow: 0 2px 8px rgba(15, 42, 67, 0.03);
        }

        .cta-section {
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(15, 42, 67, 0.94) 0%, rgba(15, 42, 67, 0.75) 100%);
        }

        .back-to-top {
            position: fixed;
            right: 24px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--color-ink-900);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 24px rgba(15, 42, 67, 0.25);
            opacity: 0;
            visibility: hidden;
            transition: all .3s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 30;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--color-coral-500);
            transform: translateY(-2px);
        }

        @media (max-width: 767px) {
            .step-num {
                font-size: 1.9rem;
            }
            .faq-question {
                padding: 16px 16px;
                font-size: 0.96rem;
            }
            .faq-answer-inner {
                padding: 0 16px 18px;
                font-size: 0.92rem;
            }
        }

/* roulang page: category2 */
:root {
    --color-ink-900: #0F2A43;
    --color-ink-800: #16385A;
    --color-coral-500: #E5784F;
    --color-coral-700: #C95B34;
    --color-paper: #F8F7F2;
    --color-line: #E8E5DC;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }

  body {
    font-family: 'PingFang SC', 'HarmonyOS Sans', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    background-color: var(--color-paper);
    color: var(--color-ink-900);
    font-size: 16px;
    line-height: 1.8;
  }

  img { max-width: 100%; height: auto; }
  a { color: inherit; text-decoration: none; }
  button { font-family: inherit; }

  /* ===== 容器 ===== */
  .container-lg {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
  }
  @media (min-width: 768px) {
    .container-lg { padding: 0 24px; }
  }
  @media (min-width: 1024px) {
    .container-lg { padding: 0 48px; }
  }

  /* ===== 导航项 ===== */
  .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 10px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    font-weight: 500;
    transition: background-color 200ms cubic-bezier(0.4, 0, 0.2, 1), color 200ms cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    white-space: nowrap;
  }
  .nav-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: #fff;
  }
  .nav-item.active {
    background-color: rgba(255, 255, 255, 0.05);
    color: #fff;
  }
  .nav-item.active::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 18px;
    border-radius: 0 3px 3px 0;
    background-color: var(--color-coral-500);
  }

  /* ===== 按钮 ===== */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--color-coral-500);
    color: #fff;
    font-weight: 700;
    border-radius: 10px;
    padding: 14px 28px;
    cursor: pointer;
    border: none;
    transition: background-color 200ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 200ms, transform 200ms;
  }
  .btn-primary:hover {
    background-color: var(--color-coral-700);
    box-shadow: 0 8px 24px rgba(229, 120, 79, 0.35);
  }
  .btn-primary:active { transform: scale(0.98); }

  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--color-ink-900);
    border: 1px solid var(--color-ink-900);
    font-weight: 600;
    border-radius: 10px;
    padding: 14px 28px;
    cursor: pointer;
    transition: background-color 200ms, color 200ms, transform 200ms;
  }
  .btn-secondary:hover {
    background-color: var(--color-ink-900);
    color: #fff;
  }
  .btn-secondary:active { transform: scale(0.98); }

  .btn-secondary-light {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.4);
    font-weight: 600;
    border-radius: 10px;
    padding: 14px 28px;
    cursor: pointer;
    transition: background-color 200ms, border-color 200ms, transform 200ms;
  }
  .btn-secondary-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: #fff;
  }
  .btn-secondary-light:active { transform: scale(0.98); }

  /* ===== 卡片 ===== */
  .card-base {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(15, 42, 67, 0.04);
    transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 200ms, border-color 200ms;
  }
  .card-base:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(15, 42, 67, 0.10);
    border-color: rgba(229, 120, 79, 0.3);
  }

  /* ===== 标签 ===== */
  .hero-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background-color: var(--color-paper);
    color: var(--color-ink-900);
    border: 1px solid rgba(229, 120, 79, 0.2);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
  }

  /* ===== 步骤 ===== */
  .step-number {
    font-size: 64px;
    line-height: 1;
    font-weight: 800;
    color: var(--color-coral-500);
    letter-spacing: -2px;
    flex-shrink: 0;
  }
  .step-heading {
    position: relative;
    padding-bottom: 12px;
  }
  .step-heading::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    max-width: 480px;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--color-coral-500) 0%, var(--color-coral-500) 40%, rgba(229, 120, 79, 0.1) 100%);
  }

  /* ===== 系统配置 ===== */
  .spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .spec-row:last-child { border-bottom: none; }
  .spec-name { color: rgba(255, 255, 255, 0.5); font-size: 14px; }
  .spec-value { color: #fff; font-size: 15px; font-weight: 600; }

  /* ===== FAQ ===== */
  .faq-item {
    border: 1px solid var(--color-line);
    border-radius: 12px;
    background: #fff;
    overflow: hidden;
    transition: border-color 200ms;
  }
  .faq-item + .faq-item { margin-top: 12px; }
  .faq-item summary {
    cursor: pointer;
    padding: 18px 24px;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 200ms;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-item summary::after {
    content: '+';
    font-size: 22px;
    line-height: 1;
    color: var(--color-coral-500);
    transition: transform 200ms;
  }
  .faq-item[open] summary::after { content: '×'; }
  .faq-item summary:hover { background-color: var(--color-paper); }
  .faq-item .faq-content {
    padding: 16px 24px 20px;
    color: #4a5568;
    font-size: 15px;
    line-height: 1.8;
    background-color: var(--color-paper);
    border-top: 1px solid var(--color-line);
  }

  /* ===== 动画 ===== */
  .scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 500ms cubic-bezier(0.4, 0, 0.2, 1), transform 500ms cubic-bezier(0.4, 0, 0.2, 1);
  }
  .scroll-reveal.animate-in {
    opacity: 1;
    transform: translateY(0);
  }

  /* ===== 区块标题 ===== */
  .section-eyebrow {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-coral-700);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 8px;
  }
  .section-title {
    font-size: 30px;
    line-height: 1.3;
    font-weight: 800;
    color: var(--color-ink-900);
    margin-bottom: 12px;
  }
  @media (min-width: 768px) {
    .section-title { font-size: 36px; }
  }
  .section-desc {
    font-size: 16px;
    color: #64748b;
    max-width: 560px;
  }

  /* ===== 焦点状态 ===== */
  a:focus-visible,
  button:focus-visible,
  summary:focus-visible {
    outline: 3px solid rgba(229, 120, 79, 0.4);
    outline-offset: 2px;
  }