:root {
    --brand-green: #00B36B;
    --brand-green-dark: #00995c;
    --brand-blue: #0078D4;
    --brand-orange: #FF8C00;
    --brand-purple: #8A2BE2;
    --bg-main: #f8f9fc;
    --bg-white: #ffffff;
    --text-primary: #1a1f24;
    --text-secondary: #5e6d82;
    --border-light: #e5e9f2;
    --shadow-card: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 24px rgba(0,179,107,0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
    color: var(--text-primary); background: var(--bg-main); line-height: 1.6; 
}
a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航栏 */
.header { background: var(--bg-white); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 70px; padding: 0 20px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 24px; font-weight: 700; color: var(--text-primary); }
.logo img { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 16px; font-weight: 500; color: var(--text-secondary); padding: 5px 0; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--brand-green); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -5px; left: 0; width: 100%; height: 3px; background: var(--brand-green); border-radius: 2px; }

/* 通用组件 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 30px; border-radius: 6px; font-weight: 600; font-size: 16px; cursor: pointer; transition: 0.3s; border: 2px solid transparent; }
.btn-primary { background: var(--brand-green); color: #fff; box-shadow: 0 4px 10px rgba(0,179,107,0.3); }
.btn-primary:hover { background: var(--brand-green-dark); transform: translateY(-2px); box-shadow: 0 6px 15px rgba(0,179,107,0.4); }
.btn-outline { background: var(--bg-white); color: var(--text-primary); border-color: #d1d5db; }
.btn-outline:hover { background: #f3f4f6; border-color: #9ca3af; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.sec-title { font-size: 32px; font-weight: 800; text-align: center; margin-bottom: 15px; color: var(--text-primary); }
.sec-desc { font-size: 16px; text-align: center; color: var(--text-secondary); margin-bottom: 50px; max-width: 700px; margin-inline: auto; }
.section-padding { padding: 80px 0; }

/* Hero区 (聚合枢纽) */
.hero { background: var(--bg-white); padding: 60px 0 80px; border-bottom: 1px solid var(--border-light); }
.hero-content { display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.hero-title { font-size: 50px; font-weight: 800; line-height: 1.2; margin-bottom: 20px; }
.hero-title span { color: var(--brand-green); }
.hero-subtitle { font-size: 22px; font-weight: 600; margin-bottom: 15px; color: var(--brand-blue); }
.hero-desc { font-size: 16px; color: var(--text-secondary); margin-bottom: 35px; }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1; }
.hero-visual img { box-shadow: 0 20px 40px rgba(0,0,0,0.1); border: 1px solid var(--border-light); }

/* 四大核心功能卡片 (聚合布局) */
.agg-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: -40px; position: relative; z-index: 10; }
.agg-card { background: var(--bg-white); border-radius: 12px; padding: 25px 20px; text-align: center; box-shadow: var(--shadow-card); transition: 0.3s; border-top: 4px solid transparent; }
.agg-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.agg-card:nth-child(1) { border-top-color: var(--brand-green); }
.agg-card:nth-child(2) { border-top-color: var(--brand-blue); }
.agg-card:nth-child(3) { border-top-color: var(--brand-orange); }
.agg-card:nth-child(4) { border-top-color: var(--brand-purple); }
.agg-icon { width: 48px; height: 48px; margin: 0 auto 15px; background: #f3f4f6; border-radius: 50%; display: flex; justify-content: center; align-items: center; }
.agg-icon img { width: 28px; height: 28px; }
.agg-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.agg-card p { font-size: 13px; color: var(--text-secondary); }

/* 模块详情展示 */
.detail-modules { display: flex; flex-direction: column; gap: 60px; margin-top: 60px; }
.module-row { display: flex; align-items: center; gap: 50px; background: var(--bg-white); padding: 40px; border-radius: 16px; box-shadow: var(--shadow-card); }
.module-row:nth-child(even) { flex-direction: row-reverse; }
.mod-text { flex: 1; }
.mod-tag { display: inline-block; padding: 5px 12px; border-radius: 20px; font-size: 13px; font-weight: 700; margin-bottom: 15px; }
.tag-browse { background: rgba(0,179,107,0.1); color: var(--brand-green); }
.tag-search { background: rgba(0,120,212,0.1); color: var(--brand-blue); }
.tag-office { background: rgba(255,140,0,0.1); color: var(--brand-orange); }
.tag-security { background: rgba(138,43,226,0.1); color: var(--brand-purple); }
.mod-text h3 { font-size: 28px; font-weight: 700; margin-bottom: 15px; }
.mod-text p { font-size: 15px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.7; }
.mod-data { font-size: 14px; font-weight: 600; color: var(--text-primary); border-left: 3px solid var(--brand-green); padding-left: 10px; }
.mod-img { flex: 1.2; }
.mod-img img { border: 1px solid var(--border-light); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }

/* 对比区 */
.compare-wrap { background: var(--bg-white); border-radius: 16px; padding: 40px; box-shadow: var(--shadow-card); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 18px 20px; border-bottom: 1px solid var(--border-light); }
.compare-table th { font-weight: 600; color: var(--text-secondary); background: #f8fafc; }
.compare-table td { font-size: 15px; }
.compare-table .hl { font-weight: 700; color: var(--brand-green); background: rgba(0,179,107,0.03); }

/* 版本下载 */
.v-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card { background: var(--bg-white); padding: 40px 30px; border-radius: 12px; text-align: center; border: 1px solid var(--border-light); transition: 0.3s; display: flex; flex-direction: column; }
.v-card:hover { box-shadow: var(--shadow-card); border-color: var(--brand-green); }
.v-card.rec { position: relative; border: 2px solid var(--brand-green); box-shadow: 0 10px 25px rgba(0,179,107,0.1); }
.v-card.rec::before { content: '热门推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--brand-green); color: #fff; font-size: 12px; font-weight: 600; padding: 4px 15px; border-radius: 20px; }
.v-card h3 { font-size: 24px; font-weight: 700; margin-bottom: 15px; }
.v-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 25px; flex-grow: 1; }
.v-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { background: var(--text-primary); color: #fff; padding: 60px 0; border-radius: 16px; margin: 60px 0; }
.data-flex { display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 42px; font-weight: 800; margin-bottom: 10px; color: var(--brand-green); }
.data-item p { font-size: 15px; opacity: 0.8; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.faq-item { background: var(--bg-white); padding: 25px; border-radius: 10px; border: 1px solid var(--border-light); }
.faq-item h4 { font-size: 16px; font-weight: 600; margin-bottom: 10px; color: var(--text-primary); }
.faq-item p { font-size: 14px; color: var(--text-secondary); }

footer { text-align: center; padding: 30px 0; color: var(--text-secondary); font-size: 14px; border-top: 1px solid var(--border-light); background: var(--bg-white); }