:root {
    --bg-white: #FFFFFF;
    --bg-gray: #F5F7FA;
    --brand-blue: #0066CC;
    --brand-blue-hover: #0052A3;
    --brand-orange: #FF6600;
    --brand-orange-hover: #E65C00;
    --text-title: #333333;
    --text-main: #666666;
    --text-muted: #999999;
    --border-color: #EAEAEA;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", "SimSun", Arial, sans-serif; background-color: var(--bg-white); color: var(--text-main); line-height: 1.6; font-size: 14px; }
a { text-decoration: none; color: inherit; transition: 0.2s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* 顶部服务条 */
.top-bar { background: var(--bg-gray); border-bottom: 1px solid var(--border-color); height: 32px; line-height: 32px; font-size: 12px; color: var(--text-muted); }
.top-bar-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; padding: 0 20px; }
.top-bar a { color: var(--text-main); margin-left: 15px; }
.top-bar a:hover { color: var(--brand-blue); }

/* 主导航 */
.header { background: var(--bg-white); box-shadow: 0 2px 4px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
.nav-wrap { max-width: 1200px; margin: 0 auto; height: 80px; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; }
.logo { font-size: 26px; font-weight: bold; color: var(--brand-blue); display: flex; align-items: center; gap: 10px; }
.logo img { width: 40px; height: 40px; }
.logo span { font-size: 14px; color: var(--text-muted); font-weight: normal; border-left: 1px solid var(--border-color); padding-left: 10px; margin-left: 5px; }
.nav-links { display: flex; gap: 10px; }
.nav-links a { font-size: 16px; color: var(--text-title); padding: 0 20px; height: 80px; line-height: 80px; font-weight: bold; }
.nav-links a:hover, .nav-links a.active { color: var(--brand-blue); border-bottom: 3px solid var(--brand-blue); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 40px; border-radius: 2px; font-size: 18px; font-weight: bold; cursor: pointer; transition: 0.2s; }
.btn-primary { background: var(--brand-blue); color: #FFF; box-shadow: 0 4px 10px rgba(0,102,204,0.2); }
.btn-primary:hover { background: var(--brand-blue-hover); }
.btn-orange { background: var(--brand-orange); color: #FFF; box-shadow: 0 4px 10px rgba(255,102,0,0.2); }
.btn-orange:hover { background: var(--brand-orange-hover); }
.btn-outline { background: #FFF; color: var(--brand-blue); border: 1px solid var(--brand-blue); }
.btn-outline:hover { background: var(--bg-gray); }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 60px 20px; }
.sec-title { text-align: center; font-size: 32px; font-weight: bold; color: var(--text-title); margin-bottom: 10px; }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); margin-bottom: 50px; }

/* Hero区 */
.hero { background: url('assets/bg-pattern.png') var(--bg-gray); border-bottom: 1px solid var(--border-color); padding: 80px 20px; text-align: center; }
.hero-content { max-width: 900px; margin: 0 auto; }
.hero h1 { font-size: 54px; font-weight: bold; color: var(--text-title); margin-bottom: 20px; letter-spacing: 2px; }
.hero .subtitle { font-size: 24px; color: var(--text-main); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 50px; }
.hero-visual { max-width: 1000px; margin: 0 auto; background: #FFF; padding: 10px; border: 1px solid var(--border-color); box-shadow: 0 10px 30px rgba(0,0,0,0.1); border-radius: 4px; }

/* 核心卖点 */
.feature-wrap { background: #FFF; padding: 40px 0; border-bottom: 1px solid var(--border-color); }
.feature-grid { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; text-align: center; padding: 0 20px; }
.f-box { flex: 1; padding: 0 15px; border-right: 1px dashed var(--border-color); }
.f-box:last-child { border-right: none; }
.f-box img { width: 50px; height: 50px; margin: 0 auto 15px; }
.f-box h3 { font-size: 18px; font-weight: bold; color: var(--text-title); margin-bottom: 8px; }
.f-box p { font-size: 14px; color: var(--text-muted); }

/* 功能详情 */
.detail-sec { background: var(--bg-white); }
.detail-item { display: flex; align-items: center; gap: 50px; padding: 60px 0; border-bottom: 1px dashed var(--border-color); }
.detail-item:last-child { border-bottom: none; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: bold; color: var(--text-title); margin-bottom: 20px; border-left: 4px solid var(--brand-blue); padding-left: 15px; }
.d-text p { font-size: 16px; line-height: 1.8; margin-bottom: 30px; }
.d-data { background: var(--bg-gray); padding: 15px 20px; font-size: 18px; color: var(--brand-orange); font-weight: bold; border: 1px solid var(--border-color); }
.d-visual { flex: 1.2; text-align: center; }
.d-visual img { border: 1px solid var(--border-color); box-shadow: 0 5px 15px rgba(0,0,0,0.05); }

/* 数据背书 */
.data-sec { background: var(--brand-blue); color: #FFF; padding: 50px 0; text-align: center; }
.data-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-around; }
.data-item h4 { font-size: 46px; font-weight: bold; margin-bottom: 10px; }
.data-item p { font-size: 16px; opacity: 0.9; }

/* 浏览器对比 */
.compare-box { margin-top: 30px; border: 1px solid var(--border-color); }
.compare-table { width: 100%; border-collapse: collapse; text-align: center; }
.compare-table th, .compare-table td { padding: 18px; border: 1px solid var(--border-color); }
.compare-table th { background: var(--bg-gray); font-size: 16px; font-weight: bold; color: var(--text-title); }
.compare-table .hl { background: #F4FAFF; color: var(--brand-blue); font-weight: bold; }

/* 下载版本区 */
.dl-wrap { display: flex; justify-content: space-between; gap: 20px; }
.dl-card { flex: 1; border: 1px solid var(--border-color); padding: 40px 30px; text-align: center; transition: 0.3s; background: #FFF; }
.dl-card:hover { border-color: var(--brand-blue); box-shadow: 0 10px 20px rgba(0,0,0,0.05); transform: translateY(-5px); }
.dl-card.pro { border-top: 4px solid var(--brand-orange); }
.dl-card h3 { font-size: 24px; font-weight: bold; color: var(--text-title); margin-bottom: 15px; }
.dl-card p { font-size: 14px; margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; font-size: 16px; padding: 12px 0; }

/* FAQ */
.faq-wrap { max-width: 1000px; margin: 0 auto; }
.faq-item { border-bottom: 1px dashed var(--border-color); padding: 25px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-item h4 { font-size: 16px; font-weight: bold; color: var(--brand-blue); margin-bottom: 10px; display: flex; gap: 10px; align-items: center; }
.faq-item h4::before { content: "问"; background: var(--brand-orange); color: #FFF; padding: 2px 6px; font-size: 12px; border-radius: 2px; }
.faq-item p { font-size: 14px; line-height: 1.8; padding-left: 32px; }

/* Footer */
.footer { background: #333333; color: #CCCCCC; padding: 40px 20px; text-align: center; }
.footer-links { margin-bottom: 20px; }
.footer-links a { color: #CCCCCC; margin: 0 10px; }
.footer-links a:hover { color: #FFF; }
.footer p { margin-bottom: 10px; font-size: 13px; }