:root {
    --primary: #1E3A8A; /* 深邃商务蓝 */
    --primary-light: #3B82F6; /* 现代科技蓝 */
    --accent: #2563EB;
    --text-dark: #0F172A;
    --text-gray: #475569;
    --text-muted: #94A3B8;
    --bg-body: #F8FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E2E8F0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-body); color: var(--text-dark); line-height: 1.7; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: all 0.2s ease-in-out; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 */
.header { background: var(--bg-white); box-shadow: 0 1px 3px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--border-color); }
.nav-wrap { max-width: 1280px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; }
.logo { font-size: 22px; font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: 12px; letter-spacing: 0.5px; }
.logo img { width: 32px; height: 32px; border-radius: 6px; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-gray); }
.nav-links a:hover, .nav-links a.active { color: var(--primary-light); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: 6px; font-size: 15px; font-weight: 600; cursor: pointer; transition: 0.2s; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.btn-primary { background: var(--primary-light); color: #FFF; border: 1px solid transparent; }
.btn-primary:hover { background: var(--accent); box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2); transform: translateY(-1px); }
.btn-outline { background: var(--bg-white); color: var(--text-dark); border: 1px solid var(--border-color); }
.btn-outline:hover { background: var(--bg-body); border-color: #CBD5E1; }

/* 容器与标题 */
.container { max-width: 1280px; margin: 0 auto; padding: 80px 24px; }
.sec-title { text-align: center; font-size: 32px; font-weight: 700; color: var(--text-dark); margin-bottom: 16px; letter-spacing: -0.5px; }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-gray); margin-bottom: 56px; max-width: 700px; margin-left: auto; margin-right: auto; }

/* Hero区：现代办公场景 */
.hero { display: flex; align-items: center; padding: 100px 24px 80px; max-width: 1280px; margin: 0 auto; gap: 60px; }
.hero-content { flex: 1; }
.hero h1 { font-size: 52px; font-weight: 800; margin-bottom: 24px; color: var(--text-dark); line-height: 1.1; letter-spacing: -1px; }
.hero h1 span { color: var(--primary-light); }
.hero .subtitle { font-size: 20px; color: var(--text-gray); margin-bottom: 40px; font-weight: 400; }
.hero-btns { display: flex; gap: 16px; margin-bottom: 40px; }
.hero-visual { flex: 1.2; position: relative; }
.hero-visual img { border-radius: 12px; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15); border: 1px solid var(--border-color); }
.hero-visual::after { content: ''; position: absolute; bottom: -20px; right: -20px; width: 100%; height: 100%; background: radial-gradient(circle, #E0E7FF 10%, transparent 11%); background-size: 20px 20px; z-index: -1; opacity: 0.5; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--bg-white); padding: 32px 24px; border-radius: 8px; border: 1px solid var(--border-color); transition: 0.2s; text-align: left; }
.f-box:hover { border-color: var(--primary-light); box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05); }
.f-icon { width: 48px; height: 48px; margin-bottom: 20px; background: #EFF6FF; padding: 10px; border-radius: 8px; }
.f-box h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--text-dark); }
.f-box p { font-size: 14px; color: var(--text-gray); line-height: 1.5; }

/* 功能详情 - 左右图文 */
.detail-item { display: flex; align-items: center; gap: 80px; margin-bottom: 100px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; color: var(--text-dark); }
.d-text p { font-size: 16px; color: var(--text-gray); margin-bottom: 24px; }
.d-data { display: inline-flex; align-items: center; padding: 8px 16px; background: #F1F5F9; color: var(--primary); border-radius: 4px; font-weight: 600; font-size: 14px; border-left: 3px solid var(--primary-light); }
.d-visual { flex: 1.2; padding: 24px; background: var(--bg-white); border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05); }

/* 数据背书 */
.data-sec { background: var(--primary); padding: 72px 0; color: #FFF; margin: 40px 0; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; text-align: center; }
.data-item h4 { font-size: 40px; font-weight: 700; margin-bottom: 8px; font-family: "Segoe UI", sans-serif; }
.data-item p { font-size: 15px; color: #BFDBFE; font-weight: 500; }

/* 浏览器对比 */
.compare-box { background: var(--bg-white); border-radius: 8px; 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: 20px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { font-weight: 600; color: var(--text-muted); font-size: 14px; text-transform: uppercase; background: #F8FAFC; }
.compare-table td { font-size: 15px; color: var(--text-dark); }
.compare-table .hl { color: var(--primary-light); font-weight: 600; background: #EFF6FF; }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.dl-card { background: var(--bg-white); padding: 40px; border-radius: 8px; border: 1px solid var(--border-color); display: flex; flex-direction: column; }
.dl-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: var(--text-dark); }
.dl-card p { font-size: 14px; color: var(--text-gray); margin-bottom: 32px; flex: 1; }
.dl-card .btn { width: 100%; }
.dl-card.pro { border: 2px solid var(--primary-light); position: relative; box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05); }
.dl-card.pro::top { content: '企业推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary-light); color: #fff; font-size: 12px; padding: 2px 12px; border-radius: 12px; font-weight: 600; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { padding: 24px 0; border-bottom: 1px solid var(--border-color); }
.faq-item h4 { font-size: 16px; font-weight: 600; color: var(--text-dark); margin-bottom: 12px; }
.faq-item p { font-size: 15px; color: var(--text-gray); }

/* Footer */
.footer { border-top: 1px solid var(--border-color); background: var(--bg-white); padding: 48px 24px 32px; text-align: center; color: var(--text-muted); font-size: 14px; }