/* roulang page: index */
:root {
            --primary-dark: #0b0f19;
            --surface-dark: #111827;
            --surface-card: #1e293b;
            --accent-green: #00f298;
            --accent-hover: #00d584;
            --signal-blue: #2e86de;
            --amber-warn: #ff9f43;
            --danger-red: #ee5253;
            --text-light: #f8fafc;
            --text-muted: #94a3b8;
            --border-dark: rgba(255, 255, 255, 0.08);
            --bg-light: #f8fafc;
            --bg-alt: #f1f5f9;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: #334155;
            background-color: #ffffff;
            line-height: 1.75;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        /* 顶部状态与导航 */
        .top-bar {
            background-color: var(--primary-dark);
            color: var(--text-muted);
            font-size: 0.8125rem;
            border-bottom: 1px solid var(--border-dark);
        }
        .status-dot {
            width: 8px;
            height: 8px;
            background-color: var(--accent-green);
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 8px var(--accent-green);
            animation: pulseGreen 2s infinite;
        }
        @keyframes pulseGreen {
            0% { opacity: 1; }
            50% { opacity: 0.4; }
            100% { opacity: 1; }
        }

        .main-nav {
            background: rgba(11, 15, 25, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-dark);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-light) !important;
            letter-spacing: -0.5px;
        }
        .navbar-brand span {
            color: var(--accent-green);
        }
        .nav-link {
            color: #cbd5e1 !important;
            font-size: 0.9375rem;
            font-weight: 500;
            padding: 0.5rem 0.85rem !important;
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: var(--accent-green) !important;
        }
        .btn-accent {
            background-color: var(--accent-green);
            color: #0b0f19;
            font-weight: 600;
            border-radius: 8px;
            border: none;
            padding: 0.6rem 1.3rem;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(0, 242, 152, 0.2);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
            color: #0b0f19;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(0, 242, 152, 0.35);
        }
        .btn-outline-custom {
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--text-light);
            font-weight: 500;
            border-radius: 8px;
            padding: 0.6rem 1.3rem;
            transition: all 0.25s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-outline-custom:hover {
            border-color: var(--accent-green);
            color: var(--accent-green);
            background: rgba(0, 242, 152, 0.05);
        }

        /* Hero 区块定制 */
        .hero-section {
            background: radial-gradient(circle at 80% 20%, #1e293b 0%, #0b0f19 70%);
            color: var(--text-light);
            padding: 90px 0 100px;
            position: relative;
            border-bottom: 1px solid var(--border-dark);
        }
        .hero-badge {
            background: rgba(0, 242, 152, 0.1);
            color: var(--accent-green);
            border: 1px solid rgba(0, 242, 152, 0.3);
            font-size: 0.8125rem;
            padding: 0.35rem 0.85rem;
            border-radius: 30px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            margin-bottom: 1.5rem;
        }
        .hero-title {
            font-size: clamp(2.1rem, 4vw, 3.25rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1.25rem;
            letter-spacing: -0.5px;
        }
        .hero-desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 2rem;
            max-width: 640px;
        }
        .code-mockup {
            background: #06090e;
            border: 1px solid var(--border-dark);
            border-radius: 12px;
            padding: 1.25rem;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            font-size: 0.85rem;
            color: #94a3b8;
            box-shadow: 0 16px 36px rgba(0,0,0,0.4);
        }
        .code-header {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .code-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #475569;
        }
        .code-line {
            line-height: 1.6;
        }
        .code-keyword { color: #ff79c6; }
        .code-func { color: #50fa7b; }
        .code-string { color: #f1fa8c; }
        .code-comment { color: #6272a4; }

        /* 通用板块与排版 */
        .section-padding {
            padding: 85px 0;
        }
        .section-dark {
            background-color: var(--primary-dark);
            color: var(--text-light);
        }
        .section-light {
            background-color: #ffffff;
            color: #334155;
        }
        .section-gray {
            background-color: var(--bg-alt);
            color: #334155;
        }
        .section-title {
            font-size: 2.1rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 0.75rem;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 680px;
            margin: 0 auto;
        }

        /* 基础组件卡片 */
        .custom-card {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            padding: 2rem 1.5rem;
            transition: all 0.25s ease-in-out;
            height: 100%;
            box-shadow: 0 4px 15px rgba(15, 23, 42, 0.03);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            border-color: #cbd5e1;
            box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
        }
        .card-dark {
            background: var(--surface-card);
            border: 1px solid var(--border-dark);
            color: var(--text-light);
        }
        .card-dark:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 242, 152, 0.3);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
        }
        .icon-box {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 1.25rem;
        }
        .icon-danger { background: rgba(238, 82, 83, 0.1); color: var(--danger-red); }
        .icon-warning { background: rgba(255, 159, 67, 0.1); color: var(--amber-warn); }
        .icon-primary { background: rgba(46, 134, 222, 0.1); color: var(--signal-blue); }
        .icon-accent { background: rgba(0, 242, 152, 0.1); color: var(--accent-green); }

        /* 指标数字条 */
        .metric-item {
            text-align: center;
            padding: 1.5rem;
            border-right: 1px solid var(--border-dark);
        }
        .metric-item:last-child {
            border-right: none;
        }
        .metric-val {
            font-size: 2.75rem;
            font-weight: 800;
            color: var(--accent-green);
            line-height: 1.1;
            font-family: ui-monospace, SFMono-Regular, monospace;
        }
        .metric-label {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }

        /* 步骤节点 */
        .step-num {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(0, 242, 152, 0.15);
            color: var(--accent-green);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            border: 1px solid var(--accent-green);
            margin-bottom: 1rem;
        }

        /* 手风琴覆盖 */
        .accordion-item {
            border: 1px solid #e2e8f0;
            border-radius: 10px !important;
            margin-bottom: 0.85rem;
            overflow: hidden;
        }
        .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            padding: 1.15rem 1.25rem;
            color: #1e293b;
            background: #ffffff;
            box-shadow: none !important;
        }
        .accordion-button:not(.collapsed) {
            color: var(--signal-blue);
            background: #f8fafc;
        }
        .accordion-body {
            font-size: 0.9375rem;
            color: #475569;
            line-height: 1.7;
            padding: 1.25rem;
        }

        /* 页脚 */
        footer {
            background: #06090e;
            color: #64748b;
            font-size: 0.875rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 70px 0 30px;
        }
        footer a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }
        footer a:hover {
            color: var(--accent-green);
        }
        footer h5 {
            color: var(--text-light);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 1.25rem;
        }
        .footer-bottom {
            margin-top: 50px;
            padding-top: 25px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        @media (max-width: 991px) {
            .metric-item {
                border-right: none;
                border-bottom: 1px solid var(--border-dark);
            }
            .metric-item:last-child {
                border-bottom: none;
            }
            .hero-section {
                padding: 60px 0 70px;
            }
            .section-padding {
                padding: 60px 0;
            }
        }