:root {
            --i0sbar-primary: #42a5f5;
            --i0sbar-secondary: #263238;
            --i0sbar-bg: #ffffff;
            --i0sbar-syntax-bg: #f8f9fa;
            --i0sbar-text: #2c3e50;
            --i0sbar-text-light: #607d8b;
            --i0sbar-border: #eceff1;
            --i0sbar-accent-soft: rgba(66, 165, 245, 0.1);
            --i0sbar-radius: 12px;
            --i0sbar-max-width: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--i0sbar-text);
            background-color: var(--i0sbar-bg);
            line-height: 1.7;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏 */
        .i0sbar-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            z-index: 1000;
            border-bottom: 1px solid var(--i0sbar-border);
            padding: 0 24px;
        }

        .i0sbar-nav-container {
            max-width: var(--i0sbar-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: auto;
            min-height: 72px;
        }

        .i0sbar-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .i0sbar-logo img {
            height: 36px;
            width: auto;
        }

        .i0sbar-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .i0sbar-menu li a {
            text-decoration: none;
            color: var(--i0sbar-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 4px;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .i0sbar-menu li a:hover,
        .i0sbar-menu li a.active {
            color: var(--i0sbar-primary);
            border-bottom: 2px solid var(--i0sbar-primary);
        }

        /* Hero 区域 - 独特对角线分割感 */
        .i0sbar-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .i0sbar-hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .i0sbar-hero h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--i0sbar-secondary);
        }

        .i0sbar-hero p {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--i0sbar-text-light);
            margin-bottom: 40px;
        }

        /* 语法概览网格 */
        .i0sbar-main {
            max-width: var(--i0sbar-max-width);
            margin: 0 auto;
            padding: 64px 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .i0sbar-syntax-sidebar {
            flex: 1;
            min-width: 250px;
            position: sticky;
            top: 100px;
            height: fit-content;
        }

        .i0sbar-sidebar-nav {
            background: var(--i0sbar-syntax-bg);
            padding: 24px;
            border-radius: var(--i0sbar-radius);
            border: 1px solid var(--i0sbar-border);
        }

        .i0sbar-sidebar-nav h3 {
            margin-bottom: 16px;
            font-size: 1.1rem;
            color: var(--i0sbar-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .i0sbar-sidebar-nav ul {
            list-style: none;
        }

        .i0sbar-sidebar-nav li {
            margin-bottom: 12px;
        }

        .i0sbar-sidebar-nav a {
            text-decoration: none;
            color: var(--i0sbar-text);
            font-size: 0.95rem;
            transition: transform 0.2s;
            display: inline-block;
        }

        .i0sbar-sidebar-nav a:hover {
            color: var(--i0sbar-primary);
            transform: translateX(5px);
        }

        .i0sbar-syntax-content {
            flex: 3;
            min-width: 0;
        }

        .i0sbar-section-title {
            font-size: 2rem;
            margin-bottom: 32px;
            padding-bottom: 16px;
            border-bottom: 2px solid var(--i0sbar-accent-soft);
        }

        /* 语法演示卡片 */
        .i0sbar-syntax-card {
            background: #fff;
            border: 1px solid var(--i0sbar-border);
            border-radius: var(--i0sbar-radius);
            margin-bottom: 40px;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            transition: transform 0.3s ease;
        }

        .i0sbar-syntax-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        }

        .i0sbar-card-header {
            background: var(--i0sbar-syntax-bg);
            padding: 12px 24px;
            font-weight: 600;
            border-bottom: 1px solid var(--i0sbar-border);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .i0sbar-card-body {
            display: flex;
            flex-wrap: wrap;
        }

        .i0sbar-code-panel, .i0sbar-preview-panel {
            flex: 1;
            min-width: 300px;
            padding: 24px;
        }

        .i0sbar-code-panel {
            background: #2d3436;
            color: #dfe6e9;
            font-family: "Fira Code", monospace;
            font-size: 0.9rem;
            white-space: pre-wrap;
        }

        .i0sbar-preview-panel {
            background: #fff;
            border-left: 1px solid var(--i0sbar-border);
        }

        .i0sbar-preview-panel h2 { margin-top: 0; }
        .i0sbar-preview-panel ul, .i0sbar-preview-panel ol { padding-left: 20px; }
        .i0sbar-preview-panel blockquote {
            border-left: 4px solid var(--i0sbar-primary);
            padding-left: 16px;
            color: var(--i0sbar-text-light);
            font-style: italic;
        }

        /* 列表/表格样式增强 */
        .i0sbar-table-demo {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }
        .i0sbar-table-demo th, .i0sbar-table-demo td {
            border: 1px solid var(--i0sbar-border);
            padding: 8px 12px;
            text-align: left;
        }
        .i0sbar-table-demo th { background: var(--i0sbar-syntax-bg); }

        /* CTA 区块 */
        .i0sbar-cta {
            background: var(--i0sbar-secondary);
            color: #fff;
            padding: 80px 24px;
            text-align: center;
        }

        .i0sbar-btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--i0sbar-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
            margin-top: 24px;
        }

        .i0sbar-btn:hover {
            background: #1e88e5;
            box-shadow: 0 8px 20px rgba(66, 165, 245, 0.4);
            transform: scale(1.05);
        }

        /* 页脚 */
        .i0sbar-footer {
            background: #fcfcfc;
            padding: 64px 24px;
            border-top: 1px solid var(--i0sbar-border);
        }

        .i0sbar-footer-grid {
            max-width: var(--i0sbar-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
        }

        .i0sbar-footer-brand h4 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--i0sbar-secondary);
        }

        .i0sbar-footer-links h5 {
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .i0sbar-footer-links ul {
            list-style: none;
        }

        .i0sbar-footer-links li {
            margin-bottom: 10px;
        }

        .i0sbar-footer-links a {
            text-decoration: none;
            color: var(--i0sbar-text-light);
            transition: color 0.3s;
        }

        .i0sbar-footer-links a:hover {
            color: var(--i0sbar-primary);
        }

        .i0sbar-copyright {
            max-width: var(--i0sbar-max-width);
            margin: 40px auto 0;
            padding-top: 24px;
            border-top: 1px solid var(--i0sbar-border);
            text-align: center;
            color: var(--i0sbar-text-light);
            font-size: 0.9rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0sbar-menu {
                display: none; /* 简化移动端，实际项目中需汉堡菜单 */
            }
            .i0sbar-syntax-sidebar {
                display: none;
            }
            .i0sbar-code-panel, .i0sbar-preview-panel {
                flex: 100%;
                border-left: none;
                border-top: 1px solid var(--i0sbar-border);
            }
            .i0sbar-main {
                padding: 32px 16px;
            }
        }