:root {
    --brand-green: #00A75A;
    --brand-green-hover: #008D4B;
    --brand-dark: #1E2022;
    --text-main: #333333;
    --text-muted: #757575;
    --bg-page: #F7F8FA;
    --bg-card: #FFFFFF;
    --border-color: #EBEDF0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif; color: var(--text-main); background: var(--bg-page); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 - 规范大厂风格 */
.header { background: var(--bg-card); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow-sm); }
.nav-wrap { max-width: 1240px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 72px; padding: 0 24px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 600; color: var(--brand-dark); }
.logo img { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 40px; }
.nav-links a { font-size: 16px; color: var(--text-main); position: relative; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--brand-green); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -25px; left: 0; width: 100%; height: 3px; background: var(--brand-green); border-radius: 3px 3px 0 0; }

.container { max-width: 1240px; margin: 0 auto; padding: 80px 24px; }

/* 按钮规范 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0 32px; height: 48px; border-radius: 6px; font-size: 16px; font-weight: 600; cursor: pointer; transition: all 0.3s; }
.btn-primary { background: var(--brand-green); color: #fff; border: 1px solid var(--brand-green); box-shadow: 0 4px 12px rgba(0, 167, 90, 0.2); }
.btn-primary:hover { background: var(--brand-green-hover); box-shadow: 0 6px 16px rgba(0, 167, 90, 0.3); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--text-main); border: 1px solid #DCDFE6; }
.btn-outline:hover { color: var(--brand-green); border-color: var(--brand-green); background: #F2FCF7; }

/* 首屏区 */
.hero { display: flex; align-items: center; gap: 60px; padding: 120px 24px; max-width: 1240px; margin: 0 auto; }
.hero-content { flex: 1; }
.hero-content h1 { font-size: 56px; font-weight: 700; color: var(--brand-dark); margin-bottom: 24px; line-height: 1.1; letter-spacing: -0.5px; }
.hero-content .subtitle { font-size: 24px; color: var(--brand-green); margin-bottom: 24px; font-weight: 500; }
.hero-content .desc { font-size: 18px; color: var(--text-muted); margin-bottom: 48px; max-width: 500px; }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1.2; position: relative; }
.hero-visual img { box-shadow: var(--shadow-md); border: 1px solid var(--border-color); }

/* 统一区块标题 */
.section-title { text-align: center; font-size: 36px; font-weight: 600; color: var(--brand-dark); margin-bottom: 60px; letter-spacing: -0.5px; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.feat-item { background: var(--bg-card); padding: 40px 24px; border-radius: 12px; text-align: center; border: 1px solid var(--border-color); transition: transform 0.3s, box-shadow 0.3s; }
.feat-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feat-item img { width: 56px; height: 56px; margin: 0 auto 24px; }
.feat-item h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--brand-dark); }
.feat-item p { font-size: 14px; color: var(--text-muted); }

/* 功能详情区 (交织排版) */
.detail-block { display: flex; align-items: center; gap: 80px; margin-bottom: 80px; background: var(--bg-card); border-radius: 16px; padding: 60px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); }
.detail-block:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-tag { display: inline-block; padding: 4px 12px; background: #F2FCF7; color: var(--brand-green); border-radius: 4px; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.d-text h3 { font-size: 32px; font-weight: 600; margin-bottom: 24px; color: var(--brand-dark); }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 32px; line-height: 1.8; }
.d-data { font-size: 18px; font-weight: 600; color: var(--brand-dark); border-left: 4px solid var(--brand-green); padding-left: 16px; }
.d-visual { flex: 1.2; }
.d-visual img { width: 100%; border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); }

/* 浏览器对比 */
.compare-container { background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color); overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 24px 32px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background: #FAFAFA; font-size: 15px; color: var(--text-muted); font-weight: 500; }
.compare-table td { font-size: 16px; color: var(--text-main); }
.compare-table .highlight { background: #F9FDFB; color: var(--brand-green); font-weight: 600; border-left: 1px solid #E6F6ED; border-right: 1px solid #E6F6ED; }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 */
.version-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.v-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 48px 32px; text-align: center; transition: 0.3s; display: flex; flex-direction: column; }
.v-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.v-card.main-v { border-color: var(--brand-green); position: relative; }
.v-card.main-v::before { content: '官方推荐'; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--brand-green); color: #fff; padding: 4px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; }
.v-card h3 { font-size: 24px; font-weight: 600; color: var(--brand-dark); margin-bottom: 16px; }
.v-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 32px; flex: 1; }
.v-card .btn { width: 100%; }

/* 数据背书 */
.data-overview { display: flex; justify-content: center; gap: 120px; background: var(--brand-dark); border-radius: 16px; padding: 80px 40px; color: #fff; margin: 80px auto; max-width: 1240px; }
.data-item { text-align: center; }
.data-item h4 { font-size: 56px; font-weight: 700; color: var(--brand-green); margin-bottom: 16px; line-height: 1; }
.data-item p { font-size: 16px; color: rgba(255,255,255,0.7); }

/* FAQ */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-box { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 16px; padding: 24px 32px; }
.faq-box h4 { font-size: 18px; font-weight: 600; color: var(--brand-dark); margin-bottom: 12px; }
.faq-box p { font-size: 15px; color: var(--text-muted); line-height: 1.6; }

/* Footer */
.footer { background: #FFFFFF; border-top: 1px solid var(--border-color); padding: 40px 24px; text-align: center; color: var(--text-muted); font-size: 14px; }