:root {
            --brand: #ff6b28;
            --ink: #161616;
            --muted: #666;
            --line: #ececec;
            --bg: #f7f8fa;
        }
        * { box-sizing: border-box; }
        body {
            margin: 0;
            font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--ink);
            background: var(--bg);
        }
        .wrap {
            width: min(960px, 92vw);
            margin: 0 auto;
            padding: 36px 0 56px;
        }
        .topbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
        }
        .back-home {
            color: var(--brand);
            text-decoration: none;
            font-weight: 700;
        }
        h1 {
            margin: 8px 0 10px;
            font-size: clamp(1.55rem, 3.2vw, 2.2rem);
            line-height: 1.2;
        }
        .desc {
            margin: 0 0 20px;
            color: var(--muted);
        }
        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 14px;
        }
        .card {
            display: block;
            text-decoration: none;
            color: inherit;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 16px;
            transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
        }
        .card:hover {
            transform: translateY(-2px);
            border-color: #ffd1b9;
            box-shadow: 0 8px 20px rgba(0, 0, 0, .06);
        }
        .card-title {
            margin: 0 0 8px;
            font-size: 1.05rem;
        }
        .card-desc {
            margin: 0;
            color: var(--muted);
            font-size: .94rem;
        }
        .tip {
            margin-top: 18px;
            color: var(--muted);
            font-size: .92rem;
            background: #fff;
            border: 1px dashed #d8d8d8;
            border-radius: 10px;
            padding: 12px 14px;
        }
        .toolbar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 6px 0 14px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 14px;
            border-radius: 10px;
            border: 1px solid #ffd1b9;
            background: #fff4ee;
            color: #a64310;
            text-decoration: none;
            font-weight: 700;
            font-size: .92rem;
            cursor: pointer;
        }
        .btn:hover {
            background: #ffe9dd;
        }
        .preview {
            margin-top: 14px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            overflow: hidden;
        }
        .preview-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            border-bottom: 1px solid var(--line);
            background: #fafafa;
            font-size: .95rem;
        }
        .preview-frame {
            width: 100%;
            height: min(78vh, 980px);
            border: 0;
            display: block;
        }