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

        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
            color: #333;
            line-height: 1.6;
            min-height: 100vh;
            padding-bottom: 40px;
        }

        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 20px;
        }

        /* ── Header ── */
        .header {
            text-align: center;
            margin-bottom: 50px;
            padding: 40px 20px;
            background: rgba(255,255,255,0.1);
            border-radius: 20px;
            backdrop-filter: blur(10px);
            box-shadow: 0 8px 32px rgba(31,38,135,0.15);
        }

        h1 {
            color: #fff;
            font-size: 3em;
            margin-bottom: 15px;
            text-shadow: 3px 3px 6px rgba(0,0,0,0.3);
            font-weight: 700;
            letter-spacing: 2px;
        }

        .header p {
            color: rgba(255,255,255,0.95);
            font-size: 1.2em;
            margin: 8px 0;
            font-weight: 300;
        }

        .version-badge {
            display: inline-block;
            background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
            color: #fff;
            font-size: 0.85em;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            margin-top: 10px;
            letter-spacing: 1px;
        }

        /* ── Section ── */
        .doc-section {
            margin-bottom: 45px;
        }

        .section-title {
            text-align: center;
            padding: 18px 25px;
            border-radius: 12px;
            margin-bottom: 25px;
            font-size: 1.6em;
            font-weight: bold;
            color: #fff;
            box-shadow: 0 4px 15px rgba(0,0,0,0.25);
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
        }

        .section-title::before {
            content: '';
            position: absolute;
            top: 0; left: -100%;
            width: 100%; height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .section-title:hover::before {
            left: 100%;
        }

        .st-blue   { background: linear-gradient(135deg, #3498db 0%, #2980b9 100%); }
        .st-green  { background: linear-gradient(135deg, #27ae60 0%, #229954 100%); }
        .st-orange { background: linear-gradient(135deg, #e67e22 0%, #d35400 100%); }
        .st-red    { background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%); }
        .st-purple { background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%); }

        /* ── Card Grid ── */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }

        @media (max-width: 1200px) {
            .card-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
        }

        @media (max-width: 768px) {
            .card-grid { grid-template-columns: 1fr; gap: 16px; }
            h1 { font-size: 2em; }
        }

        .card {
            background-color: #fff;
            border-radius: 14px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.12);
            overflow: hidden;
            transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            border: 1px solid rgba(255,255,255,0.8);
            padding: 24px;
        }

        .card::after {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 4px;
            background: linear-gradient(90deg, #3498db, #e74c3c, #27ae60);
            opacity: 0;
            transition: opacity 0.35s;
        }

        .card:hover {
            transform: translateY(-8px) scale(1.02);
            box-shadow: 0 12px 35px rgba(0,0,0,0.2);
        }

        .card:hover::after {
            opacity: 1;
        }

        .card-icon {
            font-size: 2em;
            margin-bottom: 10px;
        }

        .card h3 {
            color: #2c3e50;
            font-size: 1.15em;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .card p {
            color: #666;
            font-size: 0.92em;
            line-height: 1.5;
        }

        .card .card-tag {
            display: inline-block;
            font-size: 0.78em;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 20px;
            margin-top: 10px;
        }

        .tag-blue   { background: linear-gradient(135deg, #eaf6ff, #dceefb); color: #2980b9; }
        .tag-green  { background: linear-gradient(135deg, #e8f8f0, #d5f5e3); color: #229954; }
        .tag-orange { background: linear-gradient(135deg, #fef5e7, #fdebd0); color: #d35400; }
        .tag-red    { background: linear-gradient(135deg, #fdecea, #fbd5d0); color: #c0392b; }
        .tag-purple { background: linear-gradient(135deg, #f4ecf7, #e8daef); color: #8e44ad; }

        /* ── Info Block (env / params) ── */
        .info-block {
            background-color: #fff;
            border-radius: 14px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.12);
            padding: 30px 35px;
            border: 1px solid rgba(255,255,255,0.8);
            overflow: hidden;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95em;
        }

        th {
            text-align: left;
            padding: 12px 14px;
            font-weight: 600;
            color: #2c3e50;
            border-bottom: 2px solid #eee;
        }

        td {
            padding: 12px 14px;
            border-bottom: 1px solid #f5f5f5;
            color: #555;
        }

        tr:last-child td {
            border-bottom: none;
        }

        tr:hover td {
            background: #f8f9ff;
        }

        code {
            background: linear-gradient(135deg, #eaf6ff, #dceefb);
            color: #2980b9;
            padding: 2px 10px;
            border-radius: 6px;
            font-size: 0.9em;
            font-family: 'Cascadia Code', Consolas, monospace;
        }

        /* ── Code Block ── */
        .code-block {
            background: #1e1e2e;
            color: #a6e3a1;
            padding: 20px 24px;
            border-radius: 12px;
            font-family: 'Cascadia Code', Consolas, monospace;
            font-size: 0.88em;
            line-height: 1.9;
            overflow-x: auto;
            white-space: pre;
            box-shadow: 0 5px 25px rgba(0,0,0,0.2);
        }

        .code-label {
            display: inline-block;
            background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
            color: #fff;
            font-size: 0.78em;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 6px 6px 0 0;
            margin-bottom: 0;
            letter-spacing: 0.5px;
        }

        .code-wrapper {
            position: relative;
        }

        .code-wrapper .code-block {
            border-radius: 0 12px 12px 12px;
        }

        /* ── Tree Block ── */
        .tree-block {
            background: #1e1e2e;
            color: #a6e3a1;
            padding: 20px 24px;
            border-radius: 12px;
            font-family: Consolas, monospace;
            font-size: 0.88em;
            line-height: 1.8;
            box-shadow: 0 5px 25px rgba(0,0,0,0.2);
        }

        /* ── Timeline ── */
        .timeline {
            position: relative;
            padding-left: 36px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 14px;
            top: 6px;
            bottom: 6px;
            width: 3px;
            background: linear-gradient(180deg, #3498db, #9b59b6, #e74c3c);
            border-radius: 2px;
        }

        .timeline-item {
            position: relative;
            margin-bottom: 22px;
            padding: 18px 22px;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.08);
            border: 1px solid rgba(255,255,255,0.8);
            transition: all 0.3s ease;
        }

        .timeline-item:hover {
            transform: translateX(4px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.14);
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -29px;
            top: 22px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #3498db;
            border: 3px solid #fff;
            box-shadow: 0 2px 6px rgba(52,152,219,0.4);
        }

        .timeline-item:last-child { margin-bottom: 0; }
        .timeline-item:last-child::before { background: #e74c3c; box-shadow: 0 2px 6px rgba(231,76,60,0.4); }

        .timeline-item h4 {
            color: #2c3e50;
            font-size: 1.05em;
            margin-bottom: 6px;
        }

        .timeline-item p {
            color: #777;
            font-size: 0.9em;
        }

        /* ── Two Col Layout ── */
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 22px;
        }

        @media (max-width: 768px) {
            .two-col { grid-template-columns: 1fr; }
        }

        /* ── Footer ── */
        .footer {
            text-align: center;
            margin-top: 50px;
            padding: 20px;
            color: rgba(255,255,255,0.6);
            font-size: 0.9em;
        }

        /* ── Animation ── */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .doc-section {
            animation: fadeInUp 0.5s ease-out;
        }