:root {
            --i5tw1i-primary: #FF6C37;
            --i5tw1i-primary-dark: #e05a2b;
            --i5tw1i-secondary: #212121;
            --i5tw1i-text: #24292e;
            --i5tw1i-text-light: #6a737d;
            --i5tw1i-bg-light: #ffffff;
            --i5tw1i-bg-gray: #f6f8fa;
            --i5tw1i-border: #e1e4e8;
            --i5tw1i-shadow: 0 8px 24px rgba(149, 157, 165, 0.2);
            --i5tw1i-radius: 12px;
            --i5tw1i-max-width: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--i5tw1i-text);
            background-color: var(--i5tw1i-bg-light);
            word-break: break-word;
            overflow-x: hidden;
        }

        /* 导航栏设计 */
        .i5tw1i-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--i5tw1i-border);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .i5tw1i-nav-container {
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            width: 100%;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .i5tw1i-logo {
            flex-shrink: 0;
            margin-right: 32px;
        }

        .i5tw1i-logo img {
            height: 32px;
            display: block;
        }

        .i5tw1i-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .i5tw1i-nav-item {
            min-width: 0;
        }

        .i5tw1i-nav-link {
            text-decoration: none;
            color: var(--i5tw1i-text);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 4px;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .i5tw1i-nav-link:hover {
            color: var(--i5tw1i-primary);
        }

        .i5tw1i-nav-link.i5tw1i-active {
            color: var(--i5tw1i-primary);
            border-bottom: 2px solid var(--i5tw1i-primary);
        }

        /* Hero 区域 - 独特非对称布局 */
        .i5tw1i-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at top right, #fff5f2, #ffffff);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .i5tw1i-hero-content {
            max-width: var(--i5tw1i-max-width);
            width: 100%;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 48px;
            align-items: center;
        }

        .i5tw1i-hero-text {
            min-width: 0;
        }

        .i5tw1i-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            color: var(--i5tw1i-secondary);
            margin-bottom: 24px;
            font-weight: 800;
            word-break: keep-all;
        }

        .i5tw1i-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--i5tw1i-text-light);
            margin-bottom: 32px;
            max-width: 600px;
        }

        .i5tw1i-hero-visual {
            position: relative;
            background: var(--i5tw1i-primary);
            border-radius: var(--i5tw1i-radius);
            padding: 40px;
            color: white;
            box-shadow: 20px 20px 60px rgba(255, 108, 55, 0.2);
            transform: rotate(2deg);
            transition: transform 0.4s ease;
        }

        .i5tw1i-hero-visual:hover {
            transform: rotate(0deg);
        }

        /* 教程核心卡片展示 */
        .i5tw1i-section {
            padding: 80px 24px;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
        }

        .i5tw1i-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .i5tw1i-section-title {
            font-size: 2.5rem;
            margin-bottom: 16px;
            color: var(--i5tw1i-secondary);
        }

        .i5tw1i-layers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .i5tw1i-layer-card {
            background: var(--i5tw1i-bg-gray);
            border: 1px solid var(--i5tw1i-border);
            border-radius: var(--i5tw1i-radius);
            padding: 32px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .i5tw1i-layer-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--i5tw1i-shadow);
            border-color: var(--i5tw1i-primary);
        }

        .i5tw1i-layer-id {
            font-family: monospace;
            color: var(--i5tw1i-primary);
            font-weight: bold;
            margin-bottom: 16px;
            display: block;
        }

        .i5tw1i-layer-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--i5tw1i-secondary);
        }

        .i5tw1i-layer-logic {
            font-size: 0.95rem;
            color: var(--i5tw1i-text-light);
            margin-bottom: 24px;
        }

        .i5tw1i-capability-list {
            list-style: none;
            margin-top: auto;
        }

        .i5tw1i-capability-item {
            font-size: 0.85rem;
            padding: 6px 0;
            border-top: 1px solid var(--i5tw1i-border);
            display: flex;
            align-items: center;
        }

        .i5tw1i-capability-item::before {
            content: "•";
            color: var(--i5tw1i-primary);
            margin-right: 8px;
            font-weight: bold;
        }

        /* 教程步骤展示区 */
        .i5tw1i-tutorial-steps {
            background-color: var(--i5tw1i-secondary);
            color: white;
            border-radius: 24px;
            padding: 64px;
            margin-top: 48px;
        }

        .i5tw1i-step-item {
            display: flex;
            flex-wrap: wrap;
            margin-bottom: 48px;
            gap: 24px;
        }

        .i5tw1i-step-number {
            font-size: 3rem;
            font-weight: 900;
            color: rgba(255, 255, 255, 0.1);
            line-height: 1;
            flex: 0 0 100px;
        }

        .i5tw1i-step-body {
            flex: 1;
            min-width: 280px;
        }

        .i5tw1i-step-title {
            font-size: 1.5rem;
            margin-bottom: 12px;
            color: var(--i5tw1i-primary);
        }

        /* 动态资讯区块 */
        .i5tw1i-dynamic-section {
            background: var(--i5tw1i-bg-gray);
            padding: 80px 0;
        }

        .i5tw1i-article-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .i5tw1i-article-card {
            background: white;
            padding: 24px;
            border-radius: var(--i5tw1i-radius);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }

        /* 页脚设计 */
        .i5tw1i-footer {
            background: var(--i5tw1i-secondary);
            color: #8b949e;
            padding: 64px 24px;
            text-align: center;
        }

        .i5tw1i-footer-brand {
            font-size: 1.5rem;
            color: white;
            font-weight: bold;
            margin-bottom: 16px;
        }

        .i5tw1i-footer-nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 24px;
            margin-bottom: 32px;
        }

        .i5tw1i-footer-link {
            color: #8b949e;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .i5tw1i-footer-link:hover {
            color: white;
        }

        .i5tw1i-footer-copy {
            font-size: 13px;
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 32px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i5tw1i-navbar {
                height: auto;
                padding: 12px 0;
            }
            .i5tw1i-nav-container {
                flex-direction: column;
                gap: 12px;
            }
            .i5tw1i-nav-menu {
                justify-content: center;
            }
            .i5tw1i-hero {
                padding-top: 140px;
            }
            .i5tw1i-tutorial-steps {
                padding: 32px;
            }
            .i5tw1i-step-number {
                flex: 0 0 100%;
                margin-bottom: 8px;
            }
        }