:root {
            --primary: #2563eb;
            --primary-hover: #1d4ed8;
            --primary-soft: rgba(37, 99, 235, 0.12);
            --text-main: #0f172a;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border: rgba(148, 163, 184, 0.18);
            --surface: rgba(255, 255, 255, 0.86);
            --shadow-sm: 0 10px 24px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 20px 50px rgba(15, 23, 42, 0.1);
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-sm: 999px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            color: var(--text-main);
            background:
                radial-gradient(circle at top left, rgba(37, 99, 235, 0.14), transparent 24%),
                radial-gradient(circle at top right, rgba(96, 165, 250, 0.12), transparent 20%),
                linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
            line-height: 1.7;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .container {
            width: min(1000px, calc(100% - 28px));
            margin: 0 auto;
        }

        .navbar {
            position: sticky;
            top: 0;
            z-index: 20;
            background: rgba(255, 255, 255, 0.72);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.7);
            box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
        }

        .navbar-inner {
            min-height: 76px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .brand-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .brand-mark {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: linear-gradient(135deg, #2563eb, #60a5fa);
            box-shadow: 0 12px 24px rgba(37, 99, 235, 0.16);
            position: relative;
        }

        .brand-mark::before,
        .brand-mark::after {
            content: "";
            position: absolute;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.92);
        }

        .brand-mark::before {
            width: 18px;
            height: 18px;
            left: 10px;
            top: 10px;
        }

        .brand-mark::after {
            width: 10px;
            height: 10px;
            right: 10px;
            bottom: 10px;
        }

        .brand-copy strong {
            display: block;
            font-size: 1.12rem;
            letter-spacing: -0.02em;
            text-align: center;
        }

        .breadcrumb {
            padding: 24px 0 16px;
            font-size: 0.9rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .breadcrumb a {
            color: var(--text-main);
            transition: color 0.2s;
        }
        
        .breadcrumb a:hover {
            color: var(--primary);
        }
        
        .breadcrumb span {
            color: var(--text-light);
        }

        .main-layout {
            display: grid;
            grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
            gap: 28px;
            margin-bottom: 48px;
        }

        .surface-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255, 255, 255, 0.76);
            box-shadow: var(--shadow-md);
            backdrop-filter: blur(16px);
            overflow: hidden;
        }

        .article-card {
            padding: 36px 40px;
        }

        .article-header {
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border);
            text-align: center;
        }

        .article-title {
            font-size: clamp(1.4rem, 3vw, 1.8rem);
            font-weight: 800;
            line-height: 1.4;
            margin-bottom: 16px;
            color: var(--text-main);
            letter-spacing: -0.02em;
        }

        .article-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            background: rgba(148, 163, 184, 0.08);
            padding: 4px 12px;
            border-radius: var(--radius-sm);
        }

        .article-body {
            font-size: 1.08rem;
            color: #334155;
            line-height: 1.8;
        }

        .article-body p {
            margin-bottom: 1.6em;
        }

        .article-body h2, .article-body h3 {
            margin: 1.8em 0 1em;
            color: var(--text-main);
            font-weight: 700;
        }

        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: var(--shadow-sm);
        }

        .action-box {
            margin: 40px 0 20px;
            padding: 32px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.04), rgba(96, 165, 250, 0.08));
            border: 1px solid rgba(37, 99, 235, 0.1);
            border-radius: var(--radius-md);
            text-align: center;
        }

        .action-box h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .action-box p {
            color: var(--text-muted);
            margin-bottom: 24px;
            font-size: 0.95rem;
        }

        .btn-action {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--primary), #60a5fa);
            color: #fff;
            font-weight: 600;
            font-size: 1.05rem;
            border-radius: var(--radius-sm);
            box-shadow: 0 12px 24px rgba(37, 99, 235, 0.25);
            transition: all 0.3s ease;
        }

        .btn-action:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 32px rgba(37, 99, 235, 0.35);
        }

        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .widget {
            padding: 24px;
        }

        .widget-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .widget-title::before {
            content: "";
            display: block;
            width: 4px;
            height: 16px;
            background: var(--primary);
            border-radius: 4px;
        }

        .tags-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tags-list a {
            padding: 6px 14px;
            background: rgba(148, 163, 184, 0.08);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: all 0.2s;
        }

        .tags-list a:hover {
            background: var(--primary);
            color: #fff;
            border-color: transparent;
        }

        .recommend-list {
            list-style: none;
        }

        .recommend-list li {
            padding: 12px 0;
            border-bottom: 1px dashed var(--border);
        }

        .recommend-list li:last-child {
            border-bottom: 0;
            padding-bottom: 0;
        }

        .recommend-list a {
            display: block;
            font-size: 0.95rem;
            color: var(--text-main);
            line-height: 1.5;
            margin-bottom: 4px;
            transition: color 0.2s;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .recommend-list a:hover {
            color: var(--primary);
        }

        .recommend-list .date {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        .footer {
            margin-top: 60px;
            padding: 40px 0;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.9rem;
            background: rgba(255, 255, 255, 0.6);
            backdrop-filter: blur(10px);
            border-top: 1px solid var(--border);
        }

        @media (max-width: 768px) {
            .main-layout {
                grid-template-columns: 1fr;
            }
            .article-card {
                padding: 24px 20px;
            }
            .article-meta span {
                padding: 4px 8px;
                font-size: 0.8rem;
            }
            .action-box {
                padding: 24px 16px;
            }
        }