* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            background: #f5f6fa;
            color: #333;
            min-height: 100vh;
        }
        .container {
            max-width: 700px;
            margin: 0 auto;
            padding: 40px 24px;
        }
        h1 {
            font-size: 24px;
            margin-bottom: 6px;
            color: #667eea;
        }
        .sub {
            color: #888;
            font-size: 14px;
            margin-bottom: 32px;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: #e0e0e0;
        }
        .version-block {
            position: relative;
            margin-bottom: 32px;
        }
        .version-dot {
            position: absolute;
            left: -26px;
            top: 4px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: #667eea;
            border: 3px solid #f5f6fa;
            z-index: 1;
        }
        .version-header {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .version-date {
            font-size: 13px;
            color: #999;
            margin-bottom: 12px;
        }
        .change-list {
            list-style: none;
            padding: 0;
        }
        .change-list li {
            padding: 6px 0;
            font-size: 14px;
            color: #555;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .change-list li::before {
            content: '';
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: #667eea;
            margin-top: 7px;
            flex-shrink: 0;
        }
        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            color: #667eea;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 24px;
        }
        .back-link:hover { opacity: 0.7; }