:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --bg-white: #ffffff;
    --bg-gray: #f1f5f9;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; 
    color: var(--text-main); 
    background: var(--bg-white); 
    line-height: 1.6; 
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 导航栏 */
header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo { font-size: 24px; font-weight: 700; color: var(--primary); letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-weight: 500; font-size: 15px; color: var(--text-muted); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 32px; border-radius: 6px; font-weight: 600; font-size: 16px;
    transition: all 0.2s; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4); }
.btn-outline { background: var(--bg-white); color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--secondary); }

/* Hero 区 */
.hero {
    padding: 80px 0 100px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    text-align: center;
}
.hero h1 { font-size: 52px; font-weight: 800; color: #0f172a; margin-bottom: 20px; letter-spacing: -1px; }
.hero p { font-size: 20px; color: var(--text-muted); max-width: 680px; margin: 0 auto 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-image {
    max-width: 1000px; margin: 0 auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    background: #fff;
    padding-top: 10px;
}
.hero-image img { border-radius: 0 0 12px 12px; }

/* 通用模块 */
section { padding: 90px 0; }
.section-title { text-align: center; font-size: 36px; font-weight: 700; color: #0f172a; margin-bottom: 60px; }

/* 核心卖点 */
.features-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.feature-card {
    text-align: center; padding: 32px 20px;
    background: var(--bg-white); border-radius: 12px;
    border: 1px solid var(--border); transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--primary); }
.feature-card img { width: 56px; height: 56px; margin: 0 auto 20px; }
.feature-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: #0f172a; }
.feature-card p { font-size: 14px; color: var(--text-muted); }

/* 功能详情 */
.detail-row { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-row:nth-child(even) { flex-direction: row-reverse; }
.detail-content { flex: 1; }
.detail-content h3 { font-size: 30px; font-weight: 700; margin-bottom: 20px; color: #0f172a; }
.detail-content p { font-size: 16px; color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; }
.detail-image { flex: 1; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--border); }

/* 浏览器对比 */
.compare-section { background: var(--bg-gray); padding: 80px 0; }
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.compare-table th, .compare-table td { padding: 20px; text-align: center; border-bottom: 1px solid var(--border); }
.compare-table th { background: #f8fafc; font-weight: 600; color: #0f172a; }
.compare-table .highlight { background: #eff6ff; color: var(--primary); font-weight: 600; }

/* 下载版本 */
.version-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.version-box {
    background: #fff; padding: 48px 32px; border-radius: 12px;
    border: 1px solid var(--border); text-align: center; transition: all 0.3s;
}
.version-box:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); }
.version-box.recommended { border-top: 4px solid var(--primary); }
.version-box h3 { font-size: 24px; font-weight: 700; margin-bottom: 16px; color: #0f172a; }
.version-box p { color: var(--text-muted); margin-bottom: 32px; height: 48px; }

/* 数据背书 */
.stats-section { background: #0f172a; color: #fff; padding: 60px 0; text-align: center; }
.stats-container { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 40px; }
.stat-box h4 { font-size: 48px; font-weight: 700; color: #3b82f6; margin-bottom: 8px; }
.stat-box p { font-size: 16px; color: #94a3b8; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 1000px; margin: 0 auto; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border); padding: 24px; border-radius: 8px; }
.faq-box h4 { font-size: 16px; font-weight: 600; color: #0f172a; margin-bottom: 12px; }
.faq-box p { font-size: 14px; color: var(--text-muted); }

/* 页脚 */
footer { background: #f8fafc; border-top: 1px solid var(--border); padding: 32px 0; text-align: center; color: var(--text-muted); font-size: 14px; }