:root {
            /* 基础色调 */
            --bg-body: #ffffff;
            --bg-secondary: #f8fafc;
            --text-main: #0f172a;
            --text-muted: #64748b;
            --border-color: #e2e8f0;

            /* 糖果配色系统 */
            --c-blue: #2563eb;
            --c-green: #16a34a;
            --c-orange: #ea580c;
            --c-purple: #9333ea;
            --c-pink: #db2777;
            
            /* 背景色 */
            --bg-blue: #eff6ff;
            --bg-green: #f0fdf4;
            --bg-orange: #fff7ed;
            --bg-purple: #faf5ff;

            --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
            --radius: 16px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Plus Jakarta Sans', sans-serif; }
        
        body { 
            background-color: var(--bg-body); 
            color: var(--text-main); 
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* --- 导航栏 --- */
        header {
            position: fixed; top: 0; left: 0; width: 100%;
            background: rgba(255,255,255,0.9); backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color); z-index: 1000;
        }
        .nav-container {
            max-width: 1280px; margin: 0 auto; padding: 0 24px; height: 70px;
            display: flex; justify-content: space-between; align-items: center;
        }
        .logo { font-size: 1.4rem; font-weight: 800; display: flex; align-items: center; gap: 8px; color: var(--text-main); }
        .logo i { color: var(--c-blue); }
        .nav-links { display: flex; gap: 32px; }
        .nav-links a { text-decoration: none; color: var(--text-muted); font-weight: 600; font-size: 0.95rem; transition: 0.2s; }
        .nav-links a:hover { color: var(--c-blue); }

        /* --- Hero Section (首屏) --- */
        .hero-section {
            padding-top: 140px; padding-bottom: 80px;
            background: radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 90% 80%, rgba(219, 39, 119, 0.05) 0%, transparent 40%);
            overflow: hidden;
        }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        
        .hero-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
        }

        /* 左侧文案 */
        .hero-content h1 {
            font-size: 3.8rem; line-height: 1.1; margin-bottom: 24px; letter-spacing: -1px; font-weight: 800;
        }
        .gradient-text {
            background: linear-gradient(135deg, var(--c-blue), var(--c-purple), var(--c-pink));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        .hero-content p { font-size: 1.25rem; color: var(--text-muted); margin-bottom: 32px; max-width: 90%; }
        
        /* 标签 */
        .feature-pills { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
        .pill { padding: 8px 16px; border-radius: 30px; font-size: 0.9rem; font-weight: 600; display: flex; align-items: center; gap: 6px; }
        .pill-blue { background: var(--bg-blue); color: var(--c-blue); }
        .pill-green { background: var(--bg-green); color: var(--c-green); }

        /* 新增：按钮组 */
        .cta-group { display: flex; gap: 20px; margin-top: 40px; }
        .btn-primary {
            padding: 18px 40px;
            background: linear-gradient(135deg, var(--c-blue) 0%, var(--c-purple) 100%);
            color: white; border-radius: 50px; font-weight: 700; font-size: 1.1rem;
            text-decoration: none; box-shadow: 0 15px 30px -5px rgba(37, 99, 235, 0.3);
            transition: all 0.3s ease; display: inline-flex; align-items: center; gap: 10px;
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 20px 40px -5px rgba(37, 99, 235, 0.4); }
        
        .btn-outline {
            padding: 18px 30px; background: transparent; color: var(--text-main);
            border: 2px solid var(--border-color); border-radius: 50px; font-weight: 700; font-size: 1.1rem;
            text-decoration: none; transition: all 0.3s ease;
        }
        .btn-outline:hover { border-color: var(--text-main); background: white; }

        /* 右侧图片区域 (悬浮效果) */
        .hero-image-wrapper {
            position: relative;
            animation: float 6s ease-in-out infinite;
        }
        .hero-image-wrapper img {
            width: 100%; height: auto;
            border-radius: 24px;
            box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.15);
            border: 1px solid rgba(255,255,255,0.5);
            background: white; /* 防止图片透明背景问题 */
        }
        
        /* 装饰性背景元素 */
        .blob {
            position: absolute; width: 300px; height: 300px; border-radius: 50%;
            filter: blur(80px); z-index: -1; opacity: 0.5;
        }
        .blob-1 { background: var(--c-purple); top: -50px; right: -50px; }
        .blob-2 { background: var(--c-blue); bottom: -50px; left: -50px; }

        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-20px); }
            100% { transform: translateY(0px); }
        }

        /* --- 统计条 --- */
        .stats-bar { background: var(--bg-secondary); padding: 40px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
        .stats-grid { display: flex; justify-content: space-around; text-align: center; flex-wrap: wrap; gap: 20px; }
        .stat-item h3 { font-size: 2.5rem; font-weight: 800; color: var(--text-main); margin-bottom: 5px; }
        .stat-item p { color: var(--text-muted); font-weight: 600; }

        /* --- 应用矩阵 --- */
        .apps-section { padding: 100px 0; }
        .section-header { text-align: center; max-width: 700px; margin: 0 auto 60px; }
        .section-header h2 { font-size: 2.5rem; margin-bottom: 16px; }
        .apps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; }
        .app-card { background: white; padding: 32px; border-radius: var(--radius); border: 1px solid var(--border-color); transition: 0.3s; position: relative; }
        .app-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
        
        /* 卡片配色 */
        .card-word .icon { background: var(--bg-blue); color: var(--c-blue); }
        .card-word:hover { border-color: var(--c-blue); }
        .card-excel .icon { background: var(--bg-green); color: var(--c-green); }
        .card-excel:hover { border-color: var(--c-green); }
        .card-ppt .icon { background: var(--bg-orange); color: var(--c-orange); }
        .card-ppt:hover { border-color: var(--c-orange); }
        .card-teams .icon { background: var(--bg-purple); color: var(--c-purple); }
        .card-teams:hover { border-color: var(--c-purple); }

        .app-card .icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 24px; }
        .app-card h3 { margin-bottom: 12px; font-size: 1.25rem; }
        .app-card p { color: var(--text-muted); font-size: 0.95rem; }

        /* --- 开发者深色板块 --- */
        .dev-section { background: #0f172a; color: white; padding: 80px 0; border-radius: 30px; margin-bottom: 80px; }
        .dev-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
        .dev-list { list-style: none; margin-top: 30px; }
        .dev-list li { display: flex; align-items: center; gap: 15px; margin-bottom: 20px; font-size: 1.1rem; }
        .dev-list li i { color: var(--c-green); }

        /* --- 页脚 --- */
        footer { padding: 60px 0 30px; background: white; border-top: 1px solid var(--border-color); }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-col h5 { margin-bottom: 20px; font-size: 1rem; color: var(--text-main); }
        .footer-col a { display: block; color: var(--text-muted); text-decoration: none; margin-bottom: 12px; font-size: 0.9rem; transition:0.2s; }
        .footer-col a:hover { color: var(--c-blue); }
        .copyright { text-align: center; color: var(--text-muted); font-size: 0.85rem; padding-top: 30px; border-top: 1px solid var(--border-color); }

        /* 响应式 */
        @media (max-width: 968px) {
            .hero-grid { grid-template-columns: 1fr; text-align: center; }
            .hero-content { order: 2; }
            .hero-image-wrapper { order: 1; margin-bottom: 30px; }
            .feature-pills { justify-content: center; }
            .cta-group { justify-content: center; }
            .dev-grid { grid-template-columns: 1fr; padding: 0 20px; }
            .hero-content h1 { font-size: 2.8rem; }
        }

        .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
        .faq-item { background: var(--bg-secondary); padding: 30px; border-radius: 16px; }
        .faq-item h4 { margin-bottom: 10px; font-size: 1.1rem; }
        .faq-item p { color: var(--text-muted); font-size: 0.9rem; }