:root {
            --i0sbar-primary: #42a5f5;
            --i0sbar-primary-dark: #1e88e5;
            --i0sbar-bg: #ffffff;
            --i0sbar-text: #2c3e50;
            --i0sbar-text-light: #5d6d7e;
            --i0sbar-accent: #f8f9fa;
            --i0sbar-border: #e9ecef;
            --i0sbar-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --i0sbar-radius: 12px;
            --i0sbar-container: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--i0sbar-text);
            line-height: 1.8;
            background-color: var(--i0sbar-bg);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* 导航系统 */
        .i0sbar-navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--i0sbar-border);
            padding: 0 24px;
        }

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

        .i0sbar-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .i0sbar-logo img {
            height: 32px;
            display: block;
        }

        .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;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

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

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

        .i0sbar-hero::after {
            content: "";
            position: absolute;
            bottom: -50px;
            left: 0;
            width: 100%;
            height: 100px;
            background: var(--i0sbar-bg);
            transform: skewY(-2deg);
        }

        .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;
            font-weight: 800;
            color: #1a1a1a;
            letter-spacing: -0.02em;
        }

        .i0sbar-hero p {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--i0sbar-text-light);
            margin-bottom: 40px;
            word-break: break-word;
        }

        .i0sbar-badge {
            display: inline-block;
            background: var(--i0sbar-primary);
            color: white;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            margin-bottom: 16px;
            font-weight: 600;
        }

        /* 内容容器 */
        .i0sbar-main-container {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            padding: 64px 24px;
        }

        /* 教程区块 - 图文混排 */
        .i0sbar-section {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 96px;
            align-items: center;
        }

        .i0sbar-section-reverse {
            flex-direction: row-reverse;
        }

        .i0sbar-content-box {
            flex: 1;
            min-width: 320px;
        }

        .i0sbar-content-box h2 {
            font-size: 2.2rem;
            margin-bottom: 24px;
            color: #1a1a1a;
            position: relative;
        }

        .i0sbar-content-box h2::before {
            content: "";
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 60px;
            height: 4px;
            background: var(--i0sbar-primary);
            border-radius: 2px;
        }

        .i0sbar-code-preview {
            flex: 1;
            min-width: 320px;
            background: #282c34;
            border-radius: var(--i0sbar-radius);
            padding: 32px;
            color: #abb2bf;
            font-family: "Fira Code", monospace;
            box-shadow: var(--i0sbar-shadow);
            position: relative;
        }

        .i0sbar-code-preview::before {
            content: "MERMAID EDITOR";
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            background: #21252b;
            padding: 4px 12px;
            font-size: 0.7rem;
            border-radius: 0 0 8px 8px;
            color: #5c6370;
        }

        .i0sbar-code-line {
            display: block;
            margin-bottom: 4px;
        }

        .i0sbar-highlight { color: #c678dd; }
        .i0sbar-entity { color: #e06c75; }
        .i0sbar-string { color: #98c379; }

        /* 网格卡片 */
        .i0sbar-chart-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .i0sbar-card {
            background: var(--i0sbar-accent);
            padding: 40px;
            border-radius: var(--i0sbar-radius);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid transparent;
        }

        .i0sbar-card:hover {
            transform: translateY(-8px);
            background: white;
            box-shadow: var(--i0sbar-shadow);
            border-color: var(--i0sbar-border);
        }

        .i0sbar-card h3 {
            margin-bottom: 16px;
            font-size: 1.4rem;
        }

        /* 步骤引导 */
        .i0sbar-steps {
            background: #f8f9fa;
            border-radius: 24px;
            padding: 64px 32px;
            margin-bottom: 96px;
        }

        .i0sbar-step-list {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: space-between;
        }

        .i0sbar-step-item {
            flex: 1;
            min-width: 240px;
            position: relative;
            padding-left: 56px;
        }

        .i0sbar-step-num {
            position: absolute;
            left: 0;
            top: 0;
            width: 40px;
            height: 40px;
            background: var(--i0sbar-primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        /* 底部 CTA */
        .i0sbar-cta {
            background: var(--i0sbar-text);
            color: white;
            padding: 80px 24px;
            border-radius: 24px;
            text-align: center;
            margin-bottom: 64px;
        }

        .i0sbar-cta h2 {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .i0sbar-btn {
            display: inline-block;
            padding: 16px 48px;
            background: var(--i0sbar-primary);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            margin-top: 24px;
        }

        .i0sbar-btn:hover {
            background: var(--i0sbar-primary-dark);
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(66, 165, 245, 0.3);
        }

        /* 页脚 */
        .i0sbar-footer {
            background: #fafafa;
            border-top: 1px solid var(--i0sbar-border);
            padding: 80px 24px 40px;
        }

        .i0sbar-footer-grid {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

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

        .i0sbar-footer-links h5 {
            margin-bottom: 24px;
            font-size: 1rem;
            color: var(--i0sbar-text);
        }

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

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

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

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

        .i0sbar-footer-bottom {
            max-width: var(--i0sbar-container);
            margin: 0 auto;
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid var(--i0sbar-border);
            color: #bdc3c7;
            font-size: 0.85rem;
        }

        /* 响应式断点 */
        @media (max-width: 992px) {
            .i0sbar-nav-container {
                height: auto;
                padding: 16px 0;
            }
            .i0sbar-menu {
                justify-content: center;
                margin-top: 16px;
            }
        }

        @media (max-width: 768px) {
            .i0sbar-section {
                flex-direction: column !important;
            }
            .i0sbar-hero {
                padding: 120px 24px 60px;
            }
            .i0sbar-content-box, .i0sbar-code-preview {
                width: 100%;
                min-width: 0;
            }
        }