/* roulang page: index */
:root {
            --bg-main: #0B0F17;
            --bg-alt: #111827;
            --bg-card: #131B2A;
            --color-primary: #2563EB;
            --color-accent: #38BDF8;
            --color-success: #10B981;
            --text-main: #F9FAFB;
            --text-muted: #94A3B8;
            --border-subtle: rgba(255, 255, 255, 0.08);
        }

        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            letter-spacing: -0.015em;
        }

        .glow-border {
            border: 1px solid var(--border-subtle);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glow-border:hover {
            border-color: rgba(56, 189, 248, 0.35);
            box-shadow: 0 10px 35px -5px rgba(37, 99, 235, 0.2);
            transform: translateY(-4px);
        }

        .pulse-badge {
            animation: badgePulse 2s infinite ease-in-out;
        }
        @keyframes badgePulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.6; transform: scale(1.1); }
        }

        .glass-nav {
            background: rgba(11, 15, 23, 0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-subtle);
        }

        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-content.open {
            max-height: 300px;
            opacity: 1;
        }

/* roulang page: category2 */
:root {
      --bg-main: #0B0F17;
      --bg-alt: #111827;
      --bg-card: #131B2A;
      --color-primary: #2563EB;
      --color-accent: #38BDF8;
      --color-success: #10B981;
      --text-main: #F9FAFB;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      letter-spacing: -0.015em;
    }
    .glow-border {
      border: 1px solid var(--border-subtle);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glow-border:hover {
      border-color: rgba(56, 189, 248, 0.35);
      box-shadow: 0 10px 35px -5px rgba(37, 99, 235, 0.2);
      transform: translateY(-4px);
    }
    .pulse-badge {
      animation: badgePulse 2s infinite ease-in-out;
    }
    @keyframes badgePulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.6; transform: scale(0.96); }
    }
    .glass-nav {
      background: rgba(11, 15, 23, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .faq-content {
      transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .faq-content.open {
      max-height: 350px;
      opacity: 1;
    }
    .code-console {
      background: #070B12;
      border: 1px solid rgba(56, 189, 248, 0.15);
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

/* roulang page: category1 */
:root {
      --bg-main: #0B0F17;
      --bg-alt: #111827;
      --bg-card: #131B2A;
      --color-primary: #2563EB;
      --color-accent: #38BDF8;
      --color-success: #10B981;
      --text-main: #F9FAFB;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      letter-spacing: -0.015em;
    }
    .glow-border {
      border: 1px solid var(--border-subtle);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glow-border:hover {
      border-color: rgba(56, 189, 248, 0.35);
      box-shadow: 0 10px 35px -5px rgba(37, 99, 235, 0.2);
      transform: translateY(-4px);
    }
    .pulse-badge {
      animation: badgePulse 2s infinite ease-in-out;
    }
    @keyframes badgePulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.92); }
    }
    .glass-nav {
      background: rgba(11, 15, 23, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .faq-content {
      transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .faq-content.open {
      max-height: 300px;
      opacity: 1;
    }
    .filter-btn.active {
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.35), rgba(56, 189, 248, 0.2));
      border-color: rgba(56, 189, 248, 0.5);
      color: #38BDF8;
    }

/* roulang page: category4 */
:root {
    --bg-main: #0B0F17;
    --bg-alt: #111827;
    --bg-card: #131B2A;
    --color-primary: #2563EB;
    --color-accent: #38BDF8;
    --color-success: #10B981;
    --text-main: #F9FAFB;
    --text-muted: #94A3B8;
    --border-subtle: rgba(255, 255, 255, 0.08);
  }
  body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    overflow-x: hidden;
    letter-spacing: -0.015em;
  }
  .glow-border {
    border: 1px solid var(--border-subtle);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .glow-border:hover {
    border-color: rgba(56, 189, 248, 0.35);
    box-shadow: 0 10px 35px -5px rgba(37, 99, 235, 0.2);
    transform: translateY(-4px);
  }
  .glass-nav {
    background: rgba(11, 15, 23, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-subtle);
  }
  .faq-content {
    transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
  }
  .faq-content.open {
    max-height: 300px;
    opacity: 1;
  }
  .tab-btn.active {
    background: rgba(56, 189, 248, 0.15);
    border-color: rgba(56, 189, 248, 0.4);
    color: #38BDF8;
  }

/* roulang page: category3 */
:root {
        --bg-main: #0B0F17;
        --bg-alt: #111827;
        --bg-card: #131B2A;
        --color-primary: #2563EB;
        --color-accent: #38BDF8;
        --color-success: #10B981;
        --text-main: #F9FAFB;
        --text-muted: #94A3B8;
        --border-subtle: rgba(255, 255, 255, 0.08);
    }
    body {
        background-color: var(--bg-main);
        color: var(--text-main);
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        overflow-x: hidden;
        letter-spacing: -0.015em;
    }
    .glow-border {
        border: 1px solid var(--border-subtle);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glow-border:hover {
        border-color: rgba(56, 189, 248, 0.35);
        box-shadow: 0 10px 35px -5px rgba(37, 99, 235, 0.2);
        transform: translateY(-4px);
    }
    .pulse-badge {
        animation: badgePulse 2s infinite ease-in-out;
    }
    @keyframes badgePulse {
        0%, 100% { opacity: 1; transform: scale(1); }
        50% { opacity: 0.5; transform: scale(0.92); }
    }
    .glass-nav {
        background: rgba(11, 15, 23, 0.88);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border-subtle);
    }
    .faq-content {
        transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
    }
    .faq-content.open {
        max-height: 320px;
        opacity: 1;
    }
    .code-console {
        background: #0d131f;
        border: 1px solid rgba(56, 189, 248, 0.15);
        box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.6);
    }