:root {
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --text-dark: #0F172A;
    --text-gray: #475569;
    --text-light: #94A3B8;
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --secondary: #EFF6FF;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --radius-md: 12px;
    --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-gray);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; transition: all 0.2s ease; }
img { max-width: 100%; display: block; border-radius: var(--radius-md); }

/* 导航 - SaaS风格清晰分隔 */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 1000;
}
.nav-wrap {
    max-width: 1280px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 16px 24px;
}
.logo { font-size: 20px; font-weight: 700; color: var(--text-dark); display: flex; align-items: center; gap: 12px; letter-spacing: -0.5px; }
.logo-icon { width: 36px; height: 36px; border-radius: 8px; box-shadow: var(--shadow-sm); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-gray); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 按钮规范 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px;
    border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; transition: 0.2s;
    border: 1px solid transparent; letter-spacing: -0.2px;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: var(--bg-white); color: var(--text-dark); border-color: var(--border); box-shadow: var(--shadow-sm); }
.btn-outline:hover { background: var(--bg-light); border-color: #CBD5E1; transform: translateY(-1px); }

/* 容器与排版 */
.container { max-width: 1280px; margin: 0 auto; padding: 80px 24px; }
.sec-title { text-align: center; font-size: 36px; font-weight: 800; color: var(--text-dark); margin-bottom: 16px; letter-spacing: -1px; }
.sec-subtitle { text-align: center; font-size: 18px; color: var(--text-gray); margin-bottom: 64px; max-width: 700px; margin-left: auto; margin-right: auto; }

/* 模块化卡片 */
.saas-card {
    background: var(--bg-white); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.saas-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* Hero区 (左文右图 SaaS经典布局) */
.hero { display: flex; align-items: center; gap: 60px; padding: 60px 24px 100px; max-width: 1280px; margin: 0 auto; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 56px; font-weight: 800; color: var(--text-dark); line-height: 1.1; margin-bottom: 24px; letter-spacing: -1.5px; }
.hero-text .subtitle { font-size: 20px; color: var(--text-gray); margin-bottom: 40px; }
.hero-btns { display: flex; gap: 16px; }
.hero-visual { flex: 1; position: relative; }
.hero-visual img { border: 1px solid var(--border); box-shadow: var(--shadow-lg); border-radius: var(--radius-lg); }

/* 核心卖点网格 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { text-align: left; padding: 24px; }
.f-icon { width: 48px; height: 48px; background: var(--secondary); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--primary); }
.f-icon img { width: 28px; height: 28px; }
.f-box h3 { font-size: 16px; font-weight: 700; color: var(--text-dark); margin-bottom: 8px; }
.f-box p { font-size: 14px; color: var(--text-gray); line-height: 1.5; }

/* 功能详情 SaaS特色拆解 */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 100px; }
.detail-grid:nth-child(even) { direction: rtl; }
.detail-grid:nth-child(even) > * { direction: ltr; }
.d-text { padding: 20px 0; }
.d-label { font-size: 13px; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; display: block; }
.d-text h3 { font-size: 32px; font-weight: 800; color: var(--text-dark); margin-bottom: 20px; letter-spacing: -0.5px; }
.d-text p { font-size: 18px; color: var(--text-gray); margin-bottom: 32px; }
.d-data { display: inline-flex; align-items: center; gap: 8px; background: var(--bg-light); border: 1px solid var(--border); padding: 8px 16px; border-radius: 8px; font-weight: 600; color: var(--text-dark); }
.d-visual { background: var(--bg-white); border: 1px solid var(--border); padding: 16px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }

/* 浏览器对比 Pricing Table风格 */
.compare-box { background: var(--bg-white); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border); }
.compare-table th { background: var(--bg-light); font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-light); font-weight: 600; }
.compare-table td { font-size: 15px; color: var(--text-dark); }
.compare-table .hl { font-weight: 600; color: var(--primary); background: var(--secondary); }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 Metric 模块 */
.data-sec { background: var(--text-dark); color: #fff; padding: 80px 0; margin: 40px 0; }
.data-inner { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; text-align: center; gap: 40px; }
.data-item h4 { font-size: 48px; font-weight: 800; margin-bottom: 8px; letter-spacing: -1px; }
.data-item p { font-size: 16px; color: #94A3B8; }
.data-icon { width: 64px; height: 64px; border-radius: 16px; background: rgba(255,255,255,0.1); padding: 12px; }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.dl-card { display: flex; flex-direction: column; }
.dl-card .price-tag { font-size: 13px; font-weight: 700; color: var(--primary); background: var(--secondary); padding: 4px 12px; border-radius: 20px; display: inline-block; margin-bottom: 20px; align-self: flex-start; }
.dl-card h3 { font-size: 24px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.dl-card p { font-size: 15px; color: var(--text-gray); margin-bottom: 32px; flex: 1; }
.dl-card .btn { width: 100%; justify-content: center; }
.dl-card.pro { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary), var(--shadow-md); }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.faq-item { padding: 24px; background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius-md); }
.faq-item h4 { font-size: 16px; font-weight: 600; color: var(--text-dark); margin-bottom: 12px; }
.faq-item p { font-size: 14px; color: var(--text-gray); }

/* Footer */
.footer { background: var(--bg-white); border-top: 1px solid var(--border); padding: 48px 24px; text-align: center; margin-top: 80px; }
.footer p { color: var(--text-light); font-size: 14px; margin-bottom: 8px; }