:root {
    --bg-light: #F4FAF6; /* 极浅绿背景 */
    --bg-white: #FFFFFF;
    --primary-color: #00D26A; /* 科技绿 */
    --primary-hover: #00B35A;
    --text-title: #2D3748;
    --text-body: #4A5568;
    --text-light: #A0AEC0;
    --line-color: #E2E8F0;
    --border-radius: 4px; /* 较小的圆角，体现硬朗轻科技感 */
    --shadow-soft: 0 4px 6px rgba(0, 210, 106, 0.05), 0 1px 3px rgba(0,0,0,0.02);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif; background-color: var(--bg-light); color: var(--text-body); line-height: 1.6; font-weight: 400; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: var(--border-radius); }
ul { list-style: none; }

/* 细线网格背景纹理 */
.grid-bg { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; background-image: linear-gradient(var(--line-color) 1px, transparent 1px), linear-gradient(90deg, var(--line-color) 1px, transparent 1px); background-size: 50px 50px; opacity: 0.3; }

/* 导航 - 极简白线 */
.header { background: rgba(255, 255, 255, 0.9); border-bottom: 1px solid var(--line-color); position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(8px); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 70px; padding: 0 20px; }
.logo { font-size: 20px; font-weight: 300; color: var(--text-title); display: flex; align-items: center; gap: 12px; letter-spacing: 1px; }
.logo img { width: 28px; height: 28px; }
.logo span { font-weight: 700; }
.nav-links { display: flex; gap: 40px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-body); letter-spacing: 1px; position: relative; padding-bottom: 4px; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1px; background: var(--primary-color); transition: 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-color); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.container { max-width: 1200px; margin: 0 auto; padding: 100px 20px; position: relative; z-index: 2; }

/* 线框按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: var(--border-radius); font-size: 14px; font-weight: 600; letter-spacing: 1px; cursor: pointer; transition: 0.3s; text-transform: uppercase; }
.btn-primary { background: var(--primary-color); color: #FFF; border: 1px solid var(--primary-color); }
.btn-primary:hover { background: var(--bg-white); color: var(--primary-color); box-shadow: var(--shadow-soft); }
.btn-outline { background: transparent; color: var(--text-title); border: 1px solid var(--line-color); }
.btn-outline:hover { border-color: var(--primary-color); color: var(--primary-color); }

/* 首屏 Hero */
.hero { display: flex; align-items: center; gap: 60px; padding: 80px 20px 100px; max-width: 1200px; margin: 0 auto; position: relative; z-index: 2; }
.hero-content { flex: 1; }
.hero-content h1 { font-size: 48px; font-weight: 200; color: var(--text-title); margin-bottom: 16px; line-height: 1.2; letter-spacing: -1px; }
.hero-content h1 span { font-weight: 700; color: var(--primary-color); }
.hero-content .subtitle { font-size: 20px; color: var(--text-light); font-weight: 300; margin-bottom: 30px; letter-spacing: 2px; }
.hero-content .desc { font-size: 15px; color: var(--text-body); margin-bottom: 40px; line-height: 1.8; max-width: 480px; padding-left: 16px; border-left: 2px solid var(--primary-color); }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1.2; position: relative; }
.hero-visual::before { content: ''; position: absolute; top: -20px; left: -20px; right: 20px; bottom: 20px; border: 1px solid var(--primary-color); z-index: -1; opacity: 0.3; }
.hero-visual img { border: 1px solid var(--line-color); box-shadow: var(--shadow-soft); }

/* 细线标题 */
.sec-title { text-align: center; font-size: 28px; font-weight: 300; color: var(--text-title); margin-bottom: 60px; letter-spacing: 2px; }
.sec-title span { font-weight: 700; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--bg-white); padding: 40px 20px; text-align: center; border: 1px solid var(--line-color); transition: 0.3s; position: relative; }
.f-box::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--primary-color); transition: 0.3s; }
.f-box:hover { transform: translateY(-5px); box-shadow: var(--shadow-soft); }
.f-box:hover::after { width: 100%; }
.f-box img { width: 40px; height: 40px; margin: 0 auto 20px; opacity: 0.8; }
.f-box h3 { font-size: 15px; font-weight: 600; color: var(--text-title); margin-bottom: 10px; }
.f-box p { font-size: 13px; color: var(--text-light); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 80px; margin-bottom: 100px; }
.detail-box:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text .num-tag { font-size: 12px; font-weight: 700; color: var(--primary-color); letter-spacing: 2px; margin-bottom: 16px; display: block; }
.d-text h3 { font-size: 28px; font-weight: 300; color: var(--text-title); margin-bottom: 20px; }
.d-text h3 span { font-weight: 700; }
.d-text p { font-size: 15px; color: var(--text-body); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 8px 16px; border: 1px solid var(--line-color); color: var(--text-title); font-size: 14px; font-weight: 600; }
.d-data strong { color: var(--primary-color); font-size: 18px; margin-right: 5px; }
.d-visual { flex: 1.2; position: relative; }
.d-visual img { border: 1px solid var(--line-color); padding: 10px; background: var(--bg-white); }

/* 浏览器对比 */
.compare-box { background: var(--bg-white); border: 1px solid var(--line-color); padding: 40px; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--line-color); }
.compare-table th { color: var(--text-light); font-size: 13px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }
.compare-table td { font-size: 14px; color: var(--text-body); }
.compare-table .hl { color: var(--primary-color); font-weight: 600; background: rgba(0, 210, 106, 0.02); border-left: 2px solid var(--primary-color); }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { background: var(--bg-white); border: 1px solid var(--line-color); padding: 50px 40px; text-align: center; transition: 0.3s; }
.dl-card:hover { box-shadow: var(--shadow-soft); border-color: var(--primary-color); }
.dl-card.rec { border: 1px solid var(--primary-color); position: relative; }
.dl-card.rec::before { content: 'RECOMMENDED'; position: absolute; top: -1px; right: -1px; background: var(--primary-color); color: #FFF; padding: 4px 12px; font-size: 10px; font-weight: 700; letter-spacing: 1px; }
.dl-card h3 { font-size: 20px; font-weight: 300; color: var(--text-title); margin-bottom: 20px; }
.dl-card h3 strong { font-weight: 700; }
.dl-card p { font-size: 14px; color: var(--text-light); margin-bottom: 40px; height: 42px; line-height: 1.5; }
.dl-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { background: var(--bg-white); border-top: 1px solid var(--line-color); border-bottom: 1px solid var(--line-color); padding: 80px 20px; margin: 80px 0; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; }
.data-item { text-align: center; border-left: 1px solid var(--line-color); padding-left: 40px; }
.data-item:first-child { border-left: none; padding-left: 0; }
.data-item h4 { font-size: 42px; font-weight: 300; color: var(--text-title); margin-bottom: 10px; line-height: 1; }
.data-item h4 span { color: var(--primary-color); font-weight: 700; }
.data-item p { font-size: 13px; font-weight: 600; color: var(--text-light); letter-spacing: 1px; text-transform: uppercase; }

/* FAQ */
.faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 0; border: 1px solid var(--line-color); background: var(--bg-white); }
.faq-box { padding: 30px; border-bottom: 1px solid var(--line-color); }
.faq-box:last-child { border-bottom: none; }
.faq-box h4 { font-size: 15px; font-weight: 600; color: var(--text-title); margin-bottom: 12px; display: flex; align-items: flex-start; gap: 10px; }
.faq-box h4::before { content: 'Q.'; color: var(--primary-color); font-weight: 700; }
.faq-box p { font-size: 14px; color: var(--text-body); line-height: 1.8; padding-left: 24px; }

/* Footer */
.footer { background: var(--bg-white); border-top: 1px solid var(--line-color); text-align: center; padding: 40px; color: var(--text-light); font-size: 13px; letter-spacing: 1px; margin-top: 60px; position: relative; z-index: 2; }