:root {
            --fti6a-primary: #ff6b00;
            --fti6a-primary-hover: #e56000;
            --fti6a-bg: #fdfdfd;
            --fti6a-text-dark: #222222;
            --fti6a-text-light: #666666;
            --fti6a-white: #ffffff;
            --fti6a-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --fti6a-radius: 16px;
            --fti6a-container: 1000px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--fti6a-bg);
            color: var(--fti6a-text-dark);
            line-height: 1.8;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 */
        .fti6a-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 rgba(0,0,0,0.05);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .fti6a-nav-container {
            width: 95%;
            max-width: var(--fti6a-container);
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .fti6a-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .fti6a-logo img {
            height: 36px;
            display: block;
        }

        .fti6a-nav-links {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            min-width: 0;
        }

        .fti6a-nav-links a {
            text-decoration: none;
            color: var(--fti6a-text-dark);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s;
        }

        .fti6a-nav-links a:hover {
            color: var(--fti6a-primary);
        }

        /* Hero 区 - 对角线视觉设计 */
        .fti6a-hero {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #fff 50%, #fff5ee 50%);
            position: relative;
            overflow: hidden;
        }

        .fti6a-hero-inner {
            width: 90%;
            max-width: var(--fti6a-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .fti6a-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .fti6a-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--fti6a-text-dark);
            word-break: keep-all;
        }

        .fti6a-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--fti6a-text-light);
            margin-bottom: 32px;
            max-width: 500px;
        }

        /* 教程主体 */
        .fti6a-section {
            padding: 80px 0;
        }

        .fti6a-section-title {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 48px;
            position: relative;
        }

        .fti6a-section-title::after {
            content: '';
            display: block;
            width: 40px;
            height: 4px;
            background: var(--fti6a-primary);
            margin: 12px auto 0;
            border-radius: 2px;
        }

        .fti6a-tutorial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
            width: 90%;
            max-width: var(--fti6a-container);
            margin: 0 auto;
        }

        .fti6a-card {
            background: var(--fti6a-white);
            border-radius: var(--fti6a-radius);
            padding: 32px;
            box-shadow: var(--fti6a-shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
        }

        .fti6a-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }

        .fti6a-card-num {
            font-size: 3rem;
            font-weight: 900;
            color: rgba(255, 107, 0, 0.1);
            margin-bottom: -20px;
        }

        .fti6a-card h3 {
            margin-bottom: 16px;
            color: var(--fti6a-primary);
        }

        /* 特色列表 */
        .fti6a-feature-section {
            background: #1a1a1a;
            color: #fff;
            padding: 96px 0;
        }

        .fti6a-feature-box {
            width: 90%;
            max-width: var(--fti6a-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            align-items: center;
        }

        .fti6a-feature-text {
            flex: 1;
            min-width: 300px;
        }

        .fti6a-feature-text h2 {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .fti6a-feature-list {
            list-style: none;
        }

        .fti6a-feature-item {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .fti6a-dot {
            width: 8px;
            height: 8px;
            background: var(--fti6a-primary);
            border-radius: 50%;
            flex-shrink: 0;
        }

        /* 动态内容区 */
        .fti6a-faq-section {
            background: #fff;
        }

        .fti6a-faq-container {
            width: 90%;
            max-width: 800px;
            margin: 0 auto;
        }

        .fti6a-faq-item {
            border-bottom: 1px solid #eee;
            padding: 24px 0;
        }

        .fti6a-faq-q {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 8px;
            display: block;
        }

        /* 页脚 */
        .fti6a-footer {
            background: #f4f4f4;
            padding: 64px 0 32px;
            border-top: 1px solid #e0e0e0;
        }

        .fti6a-footer-inner {
            width: 90%;
            max-width: var(--fti6a-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

        .fti6a-footer-brand {
            flex: 1;
            min-width: 250px;
        }

        .fti6a-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--fti6a-primary);
        }

        .fti6a-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            min-width: 0;
        }

        .fti6a-link-group h4 {
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .fti6a-link-group ul {
            list-style: none;
        }

        .fti6a-link-group li {
            margin-bottom: 12px;
        }

        .fti6a-link-group a {
            color: var(--fti6a-text-light);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        .fti6a-link-group a:hover {
            color: var(--fti6a-primary);
        }

        .fti6a-copyright {
            width: 100%;
            text-align: center;
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid #ddd;
            font-size: 0.85rem;
            color: #999;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .fti6a-nav-links {
                display: none; /* 简化移动端 */
            }
            .fti6a-hero {
                padding: 120px 0 60px;
                text-align: center;
            }
            .fti6a-hero-inner {
                justify-content: center;
            }
            .fti6a-hero-subtitle {
                margin: 0 auto 32px;
            }
            .fti6a-feature-box {
                flex-direction: column;
                text-align: center;
            }
            .fti6a-feature-item {
                justify-content: center;
            }
        }