:root {
            --i0sbar-primary: #4353ff;
            --i0sbar-secondary: #64748b;
            --i0sbar-accent: #f43f5e;
            --i0sbar-bg: #ffffff;
            --i0sbar-surface: #f8fafc;
            --i0sbar-text: #1e293b;
            --i0sbar-text-light: #64748b;
            --i0sbar-border: #e2e8f0;
            --i0sbar-radius: 12px;
            --i0sbar-container: 1100px;
        }

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

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

        /* 导航栏 */
        .i0sbar-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--i0sbar-border);
        }

        .i0sbar-nav-container {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

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

        .i0sbar-logo img {
            height: 32px;
            width: auto;
        }

        .i0sbar-menu {
            display: flex;
            list-style: none;
            gap: 20px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .i0sbar-menu li {
            min-width: 0;
        }

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

        .i0sbar-menu a:hover, .i0sbar-menu a.i0sbar-active {
            color: var(--i0sbar-primary);
        }

        /* Hero 区 - 独特居中公式背景风格 */
        .i0sbar-hero {
            padding: 160px 24px 100px;
            text-align: center;
            background: radial-gradient(circle at 50% 50%, #f0f4ff 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

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

        .i0sbar-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            color: #0f172a;
            letter-spacing: -0.02em;
        }

        .i0sbar-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--i0sbar-text-light);
            max-width: 600px;
            margin: 0 auto 40px;
        }

        /* 数学公式展示卡片 */
        .i0sbar-formula-preview {
            background: #fff;
            padding: 32px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border: 1px solid var(--i0sbar-border);
            display: inline-block;
            margin-top: 24px;
            min-width: 0;
            max-width: 100%;
        }

        .i0sbar-code-display {
            font-family: "Fira Code", monospace;
            background: #f1f5f9;
            padding: 12px 20px;
            border-radius: 8px;
            margin-bottom: 16px;
            color: #475569;
            font-size: 0.9rem;
        }

        .i0sbar-math-render {
            font-size: 1.5rem;
            color: var(--i0sbar-primary);
            font-style: italic;
        }

        /* 内容区块通用样式 */
        .i0sbar-section {
            padding: 80px 24px;
            max-width: var(--i0sbar-container);
            margin: 0 auto;
        }

        .i0sbar-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .i0sbar-card {
            background: var(--i0sbar-surface);
            padding: 40px;
            border-radius: var(--i0sbar-radius);
            border: 1px solid var(--i0sbar-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            min-width: 0;
        }

        .i0sbar-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.06);
        }

        .i0sbar-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(67, 83, 255, 0.1);
            color: var(--i0sbar-primary);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .i0sbar-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: #0f172a;
        }

        /* 教程内容区 */
        .i0sbar-guide-content {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: flex-start;
        }

        .i0sbar-guide-text {
            flex: 1;
            min-width: 300px;
        }

        .i0sbar-guide-visual {
            flex: 1;
            min-width: 300px;
            background: #1e293b;
            color: #f8fafc;
            padding: 32px;
            border-radius: 16px;
            font-family: "Consolas", monospace;
        }

        .i0sbar-instruction-step {
            margin-bottom: 32px;
            border-left: 4px solid var(--i0sbar-primary);
            padding-left: 24px;
        }

        .i0sbar-instruction-step h4 {
            font-size: 1.25rem;
            margin-bottom: 8px;
        }

        /* 动态文章区块 */
        .i0sbar-articles {
            background: #f8fafc;
            width: 100vw;
            margin-left: calc(-50vw + 50%);
            padding: 80px 0;
        }

        .i0sbar-articles-inner {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 页脚 */
        .i0sbar-footer {
            padding: 64px 24px;
            border-top: 1px solid var(--i0sbar-border);
            margin-top: 80px;
            background: #fff;
        }

        .i0sbar-footer-container {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .i0sbar-footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .i0sbar-footer-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: #0f172a;
        }

        .i0sbar-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .i0sbar-footer-group h5 {
            margin-bottom: 20px;
            font-size: 1rem;
            color: #0f172a;
        }

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

        .i0sbar-footer-group li {
            margin-bottom: 12px;
        }

        .i0sbar-footer-group a {
            color: var(--i0sbar-text-light);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

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

        .i0sbar-copyright {
            width: 100%;
            padding-top: 40px;
            margin-top: 40px;
            border-top: 1px solid var(--i0sbar-border);
            text-align: center;
            color: var(--i0sbar-text-light);
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0sbar-nav-container {
                height: auto;
                padding: 16px 24px;
            }
            .i0sbar-menu {
                margin-top: 16px;
                gap: 12px;
            }
            .i0sbar-hero {
                padding-top: 120px;
            }
            .i0sbar-guide-content {
                flex-direction: column;
            }
        }