/* roulang page: index */
:root {
            --primary-blue: #1D4ED8;
            --primary-hover: #1E40AF;
            --accent-cyan: #0284C7;
            --accent-sky: #38BDF8;
            --tech-green: #10B981;
            --tech-red: #EF4444;
            --bg-main: #FFFFFF;
            --bg-subtle: #F8FAFC;
            --bg-muted: #F1F5F9;
            --border-color: #E2E8F0;
            --border-focus: #93C5FD;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --card-shadow: 0 10px 25px -5px rgba(30, 64, 175, 0.05), 0 8px 10px -6px rgba(30, 64, 175, 0.03);
            --hover-shadow: 0 20px 30px -10px rgba(30, 64, 175, 0.12);
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition-smooth: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-body);
            line-height: 1.65;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-heading);
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

        /* 统一大留白控制 */
        .section-padding {
            padding-top: 85px;
            padding-bottom: 85px;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding-top: 55px;
                padding-bottom: 55px;
            }
        }

        /* 顶部导航与分段标签 */
        .site-navbar {
            background-color: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1040;
            padding: 14px 0;
        }

        .brand-box {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.22rem;
            font-weight: 800;
            color: var(--primary-blue);
        }

        .brand-icon-sq {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            font-size: 1rem;
        }

        .segmented-tabs-wrapper {
            background-color: var(--bg-muted);
            padding: 4px;
            border-radius: 40px;
            display: inline-flex;
            border: 1px solid var(--border-color);
        }

        .segmented-tab {
            padding: 7px 20px;
            font-size: 0.92rem;
            font-weight: 600;
            color: var(--text-muted);
            border-radius: 30px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .segmented-tab.active {
            background-color: #ffffff;
            color: var(--primary-blue);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
        }

        .segmented-tab:hover:not(.active) {
            color: var(--text-heading);
        }

        .btn-brand-primary {
            background-color: var(--primary-blue);
            color: #ffffff;
            font-weight: 600;
            padding: 9px 24px;
            border-radius: 10px;
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-smooth);
        }

        .btn-brand-primary:hover {
            background-color: var(--primary-hover);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(29, 78, 216, 0.28);
            transform: translateY(-1px);
        }

        .btn-brand-outline {
            background-color: #ffffff;
            color: var(--primary-blue);
            font-weight: 600;
            padding: 9px 22px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-smooth);
        }

        .btn-brand-outline:hover {
            background-color: var(--bg-subtle);
            border-color: var(--primary-blue);
            color: var(--primary-hover);
        }

        /* 通用卡片规范 */
        .glass-card {
            background-color: var(--bg-main);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            box-shadow: var(--card-shadow);
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .glass-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--hover-shadow);
            border-color: var(--border-focus);
        }

        /* 状态指示器与脉冲动效 */
        .pulse-indicator {
            width: 8px;
            height: 8px;
            background-color: var(--tech-green);
            border-radius: 50%;
            display: inline-block;
            position: relative;
        }

        .pulse-indicator::after {
            content: '';
            position: absolute;
            top: -3px;
            left: -3px;
            right: -3px;
            bottom: -3px;
            border-radius: 50%;
            border: 2px solid var(--tech-green);
            animation: ping 1.8s cubic-bezier(0, 0, 0.2, 1) infinite;
        }

        @keyframes ping {
            75%, 100% {
                transform: scale(2.2);
                opacity: 0;
            }
        }

        /* Hero Bento 结构 */
        .hero-bento-wrapper {
            display: grid;
            grid-template-columns: 1.65fr 1fr;
            gap: 24px;
        }

        @media (max-width: 991px) {
            .hero-bento-wrapper {
                grid-template-columns: 1fr;
            }
        }

        .hero-main-card {
            padding: 44px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .hero-side-grid {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .badge-subtle-blue {
            background-color: rgba(29, 78, 216, 0.08);
            color: var(--primary-blue);
            font-weight: 600;
            font-size: 0.84rem;
            padding: 6px 14px;
            border-radius: 20px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            width: fit-content;
        }

        .metric-big-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-blue);
            line-height: 1;
        }

        /* 延迟测速对比进度条 */
        .ping-pill {
            background-color: var(--bg-subtle);
            border: 1px solid var(--border-color);
            padding: 8px 14px;
            border-radius: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.88rem;
        }

        /* 标签小组件 */
        .tag-pill {
            font-size: 0.78rem;
            padding: 3px 10px;
            border-radius: 6px;
            background-color: var(--bg-muted);
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 对比表格重塑 */
        .diff-col-good {
            background-color: rgba(2, 132, 199, 0.03);
            border-left: 2px solid var(--primary-blue);
        }

        .diff-col-bad {
            background-color: rgba(239, 68, 68, 0.02);
        }

        /* FAQ 手风琴覆写 */
        .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md) !important;
            margin-bottom: 12px;
            overflow: hidden;
            background-color: #fff;
        }

        .accordion-button {
            font-weight: 600;
            color: var(--text-heading);
            background-color: #fff;
            padding: 18px 20px;
            box-shadow: none !important;
        }

        .accordion-button:not(.collapsed) {
            color: var(--primary-blue);
            background-color: var(--bg-subtle);
        }

        .accordion-button::after {
            background-size: 1rem;
        }

        .accordion-body {
            padding: 18px 20px;
            color: var(--text-body);
            line-height: 1.7;
            font-size: 0.95rem;
            background-color: #fff;
        }

        /* 全局页脚样式 */
        .site-footer {
            background-color: var(--bg-subtle);
            border-top: 1px solid var(--border-color);
            color: var(--text-muted);
            font-size: 0.92rem;
            padding-top: 60px;
            padding-bottom: 40px;
        }

        .footer-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 18px;
        }

        .footer-links-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links-list li {
            margin-bottom: 10px;
        }

        .footer-links-list a:hover {
            color: var(--primary-blue);
        }

/* roulang page: category1 */
:root {
      --primary-blue: #1D4ED8;
      --primary-hover: #1E40AF;
      --accent-cyan: #0284C7;
      --accent-sky: #38BDF8;
      --tech-green: #10B981;
      --tech-red: #EF4444;
      --bg-main: #FFFFFF;
      --bg-subtle: #F8FAFC;
      --bg-muted: #F1F5F9;
      --border-color: #E2E8F0;
      --border-focus: #93C5FD;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --card-shadow: 0 10px 25px -5px rgba(30, 64, 175, 0.05), 0 8px 10px -6px rgba(30, 64, 175, 0.03);
      --hover-shadow: 0 20px 30px -10px rgba(30, 64, 175, 0.12);
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition-smooth: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-body);
      line-height: 1.65;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    .section-padding {
      padding-top: 75px;
      padding-bottom: 75px;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 45px;
        padding-bottom: 45px;
      }
    }
    .site-navbar {
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1040;
      padding: 14px 0;
    }
    .brand-box {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 1.22rem;
      font-weight: 800;
      color: var(--primary-blue);
    }
    .brand-icon-sq {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-size: 1rem;
    }
    .segmented-tabs-wrapper {
      background-color: var(--bg-muted);
      padding: 4px;
      border-radius: 40px;
      display: inline-flex;
      border: 1px solid var(--border-color);
    }
    .segmented-tab {
      padding: 7px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-smooth);
    }
    .segmented-tab.active,
    .segmented-tab:hover {
      background-color: #ffffff;
      color: var(--primary-blue);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    }
    .btn-brand-primary {
      background-color: var(--primary-blue);
      color: #ffffff;
      font-weight: 600;
      padding: 9px 24px;
      border-radius: 10px;
      border: 1px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-smooth);
    }
    .btn-brand-primary:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(29, 78, 216, 0.28);
      transform: translateY(-1px);
    }
    .btn-brand-outline {
      background-color: #ffffff;
      color: var(--primary-blue);
      font-weight: 600;
      padding: 9px 22px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-smooth);
    }
    .btn-brand-outline:hover {
      background-color: var(--bg-subtle);
      border-color: var(--primary-blue);
      color: var(--primary-hover);
    }
    .glass-card {
      background-color: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
      border-color: var(--border-focus);
    }
    .badge-subtle-blue {
      background-color: rgba(29, 78, 216, 0.08);
      color: var(--primary-blue);
      font-weight: 600;
      font-size: 0.84rem;
      padding: 6px 14px;
      border-radius: 20px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      width: fit-content;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--tech-green);
      display: inline-block;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }
    .ping-pill {
      background-color: var(--bg-subtle);
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.82rem;
    }
    .tag-pill {
      font-size: 0.78rem;
      padding: 3px 10px;
      border-radius: 6px;
      background-color: var(--bg-muted);
      color: var(--text-muted);
      font-weight: 500;
    }
    .filter-chip-group {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .filter-chip {
      font-size: 0.86rem;
      padding: 6px 16px;
      border-radius: 20px;
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-body);
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .filter-chip:hover, .filter-chip.active {
      background-color: var(--primary-blue);
      color: #ffffff;
      border-color: var(--primary-blue);
    }
    .resource-card-thumb {
      height: 180px;
      background: linear-gradient(145deg, #1E293B, #0F172A);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .resource-card-thumb .watermark-icon {
      font-size: 3.5rem;
      color: rgba(255, 255, 255, 0.15);
      transition: var(--transition-smooth);
    }
    .glass-card:hover .watermark-icon {
      transform: scale(1.15);
      color: rgba(56, 189, 248, 0.4);
    }
    .thumb-badge-top {
      position: absolute;
      top: 12px;
      left: 12px;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 4px;
      background: rgba(15, 23, 42, 0.8);
      color: #fff;
      backdrop-filter: blur(4px);
    }
    .thumb-badge-bitrate {
      position: absolute;
      bottom: 12px;
      right: 12px;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 4px;
      background: rgba(2, 132, 199, 0.85);
      color: #fff;
    }
    .rank-number {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      background-color: var(--bg-muted);
      color: var(--text-muted);
    }
    .rank-number.top1 {
      background-color: #FEF3C7;
      color: #D97706;
    }
    .rank-number.top2 {
      background-color: #F1F5F9;
      color: #475569;
    }
    .rank-number.top3 {
      background-color: #FFEDD5;
      color: #C2410C;
    }
    .compat-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      border-radius: 8px;
      background-color: var(--bg-subtle);
      border: 1px solid var(--border-color);
      font-size: 0.85rem;
      font-weight: 600;
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md) !important;
      margin-bottom: 12px;
      overflow: hidden;
      background-color: #ffffff;
    }
    .accordion-button {
      font-weight: 600;
      color: var(--text-heading);
      background-color: #ffffff;
      box-shadow: none !important;
      padding: 16px 20px;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary-blue);
      background-color: var(--bg-subtle);
    }
    .accordion-body {
      color: var(--text-body);
      font-size: 0.94rem;
      line-height: 1.7;
      padding: 16px 20px 20px;
    }
    .footer-custom {
      background-color: var(--bg-subtle);
      border-top: 1px solid var(--border-color);
      padding: 60px 0 28px;
    }
    .hover-primary:hover {
      color: var(--primary-blue) !important;
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}