:root {
    --bg: #E0E5EC;
    --text-title: #2D3748;
    --text-main: #4A5568;
    --text-muted: #A0AEC0;
    --primary: #38BDF8;
    --neu-light: rgba(255, 255, 255, 0.7);
    --neu-dark: rgba(163, 177, 198, 0.6);
    --neu-shadow: 9px 9px 16px var(--neu-dark), -9px -9px 16px var(--neu-light);
    --neu-shadow-sm: 5px 5px 10px var(--neu-dark), -5px -5px 10px var(--neu-light);
    --neu-inset: inset 6px 6px 10px 0 var(--neu-dark), inset -6px -6px 10px 0 var(--neu-light);
}

* { 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); color: var(--text-main); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 16px; }

/* 导航 */
.header { background-color: var(--bg); position: sticky; top: 0; z-index: 1000; padding: 15px 0; box-shadow: 0 10px 15px -10px var(--neu-dark); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; }
.logo { font-size: 22px; font-weight: 800; color: var(--text-title); display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 44px; height: 44px; border-radius: 50%; box-shadow: var(--neu-shadow-sm); display: flex; align-items: center; justify-content: center; padding: 8px; }
.nav-links { display: flex; gap: 20px; }
.nav-links a { font-size: 15px; font-weight: 600; padding: 10px 20px; border-radius: 20px; transition: all 0.3s ease; color: var(--text-main); }
.nav-links a:hover, .nav-links a.active { box-shadow: var(--neu-inset); color: var(--primary); }

/* 拟物按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 16px 36px; border-radius: 30px; font-size: 16px; font-weight: 700; cursor: pointer; transition: all 0.2s ease; box-shadow: var(--neu-shadow); color: var(--text-title); border: none; background: var(--bg); outline: none; }
.btn:hover { color: var(--primary); }
.btn:active { box-shadow: var(--neu-inset); transform: scale(0.98); color: var(--primary); }
.btn-primary { color: var(--primary); }
.btn-primary:hover { box-shadow: var(--neu-inset); transform: scale(0.98); }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; }
.sec-title { text-align: center; font-size: 32px; font-weight: 800; color: var(--text-title); margin-bottom: 20px; }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); margin-bottom: 60px; }

/* 拟物卡片 */
.neu-card { background: var(--bg); border-radius: 24px; box-shadow: var(--neu-shadow); padding: 40px; }

/* Hero区 */
.hero { text-align: center; padding: 60px 20px 80px; }
.hero h1 { font-size: 56px; font-weight: 900; color: var(--text-title); margin-bottom: 20px; letter-spacing: -1px; text-shadow: 2px 2px 4px var(--neu-dark), -2px -2px 4px var(--neu-light); }
.hero .subtitle { font-size: 22px; color: var(--primary); font-weight: 600; margin-bottom: 50px; }
.hero-btns { display: flex; justify-content: center; gap: 30px; margin-bottom: 60px; }
.hero-visual { max-width: 900px; margin: 0 auto; padding: 15px; border-radius: 24px; box-shadow: var(--neu-inset); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { text-align: center; padding: 30px 15px; border-radius: 20px; box-shadow: var(--neu-shadow); transition: 0.3s; }
.f-box:hover { box-shadow: var(--neu-inset); }
.f-icon-wrap { width: 70px; height: 70px; margin: 0 auto 20px; border-radius: 50%; box-shadow: var(--neu-shadow-sm); display: flex; align-items: center; justify-content: center; padding: 15px; }
.f-box h3 { font-size: 16px; font-weight: 800; color: var(--text-title); margin-bottom: 10px; }
.f-box p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 60px; margin-bottom: 60px; padding: 50px; border-radius: 30px; box-shadow: var(--neu-shadow); }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: 800; color: var(--text-title); margin-bottom: 20px; }
.d-text p { font-size: 16px; color: var(--text-main); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 12px 24px; border-radius: 15px; box-shadow: var(--neu-inset); font-weight: 700; color: var(--primary); }
.d-visual { flex: 1; padding: 15px; border-radius: 24px; box-shadow: var(--neu-inset); }

/* 浏览器对比 */
.compare-box { padding: 40px; border-radius: 30px; box-shadow: var(--neu-shadow); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px; border-bottom: 2px solid var(--neu-light); }
.compare-table th { font-weight: 700; color: var(--text-muted); }
.compare-table td { font-weight: 600; color: var(--text-main); }
.compare-table .hl { color: var(--primary); font-weight: 800; }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 */
.data-sec { padding: 80px 0; margin: 40px 0; box-shadow: var(--neu-inset); }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; text-align: center; }
.data-item { padding: 30px 50px; border-radius: 20px; box-shadow: var(--neu-shadow-sm); }
.data-item h4 { font-size: 40px; font-weight: 900; color: var(--primary); margin-bottom: 10px; }
.data-item p { font-size: 15px; font-weight: 600; color: var(--text-main); }
.data-center-icon { width: 80px; height: 80px; border-radius: 50%; box-shadow: var(--neu-shadow); padding: 15px; margin-top: 10px; }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.dl-card { padding: 50px 30px; border-radius: 30px; text-align: center; box-shadow: var(--neu-shadow); transition: 0.3s; }
.dl-card:hover { transform: translateY(-5px); }
.dl-card.pro { box-shadow: var(--neu-inset); }
.dl-card h3 { font-size: 24px; font-weight: 800; color: var(--text-title); margin-bottom: 15px; }
.dl-card p { font-size: 14px; color: var(--text-main); margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; }
.faq-item { margin-bottom: 30px; padding: 30px; border-radius: 20px; box-shadow: var(--neu-shadow-sm); }
.faq-item h4 { font-size: 18px; font-weight: 700; color: var(--text-title); margin-bottom: 15px; display: flex; align-items: center; gap: 12px; }
.faq-item h4::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: var(--neu-inset); }
.faq-item p { font-size: 15px; color: var(--text-main); line-height: 1.7; padding-left: 22px; }

/* Footer */
.footer { padding: 40px 20px; text-align: center; color: var(--text-muted); font-size: 14px; box-shadow: 0 -10px 15px -10px var(--neu-dark); margin-top: 40px; }