:root {
    --bg-dark: #0A0F1A;
    --bg-panel: #111827;
    --primary-cyan: #00F0FF;
    --primary-blue: #2563EB;
    --shield-green: #10B981;
    --text-white: #F8FAFC;
    --text-muted: #94A3B8;
    --border-tech: rgba(0, 240, 255, 0.2);
    --grid-bg: linear-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 240, 255, 0.05) 1px, transparent 1px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--bg-dark); color: var(--text-muted); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; }

/* 科技网格背景 */
.grid-bg { background-image: var(--grid-bg); background-size: 40px 40px; position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: -1; pointer-events: none; }
.grid-bg::after { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(circle at center, transparent 0%, var(--bg-dark) 80%); }

/* 导航 */
.header { background: rgba(10, 15, 26, 0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--border-tech); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 80px; padding: 0 20px; }
.logo { font-size: 24px; font-weight: bold; color: var(--text-white); display: flex; align-items: center; gap: 12px; text-shadow: 0 0 10px rgba(0,240,255,0.5); }
.logo img { width: 36px; height: 36px; filter: drop-shadow(0 0 5px var(--primary-cyan)); }
.nav-links { display: flex; gap: 30px; }
.nav-links a { color: var(--text-white); font-size: 15px; font-weight: 500; text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-cyan); text-shadow: 0 0 8px var(--primary-cyan); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 16px 36px; border-radius: 4px; font-size: 16px; font-weight: bold; cursor: pointer; transition: 0.3s; text-transform: uppercase; letter-spacing: 2px; }
.btn-primary { background: transparent; color: var(--primary-cyan); border: 2px solid var(--primary-cyan); box-shadow: 0 0 15px rgba(0,240,255,0.2) inset, 0 0 15px rgba(0,240,255,0.2); position: relative; overflow: hidden; }
.btn-primary::before { content: ""; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(0,240,255,0.4), transparent); transition: 0.5s; }
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover { background: rgba(0,240,255,0.1); box-shadow: 0 0 20px rgba(0,240,255,0.4) inset, 0 0 20px rgba(0,240,255,0.4); }
.btn-outline { background: var(--bg-panel); color: var(--text-white); border: 1px solid var(--text-muted); }
.btn-outline:hover { border-color: var(--text-white); }

/* 容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 100px 20px; position: relative; z-index: 10; }
.sec-title { text-align: center; font-size: 36px; font-weight: bold; color: var(--text-white); margin-bottom: 60px; text-shadow: 0 0 15px rgba(255,255,255,0.2); }
.sec-title::before { content: "[ "; color: var(--primary-cyan); }
.sec-title::after { content: " ]"; color: var(--primary-cyan); }

/* Hero */
.hero { text-align: center; padding: 120px 20px; position: relative; z-index: 10; border-bottom: 1px solid rgba(255,255,255,0.05); }
.shield-icon { font-size: 60px; color: var(--shield-green); text-shadow: 0 0 30px rgba(16,185,129,0.6); margin-bottom: 20px; display: block; animation: float 3s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
.hero h1 { font-size: 60px; font-weight: 900; color: var(--text-white); margin-bottom: 20px; letter-spacing: 2px; }
.hero .subtitle { font-size: 24px; color: var(--primary-cyan); margin-bottom: 50px; font-weight: 300; }
.hero-btns { display: flex; justify-content: center; gap: 30px; margin-bottom: 60px; }
.hero-visual { max-width: 1000px; margin: 0 auto; border: 1px solid var(--border-tech); border-radius: 8px; overflow: hidden; box-shadow: 0 0 40px rgba(0,240,255,0.15); position: relative; }
.hero-visual::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--primary-cyan); box-shadow: 0 0 10px var(--primary-cyan); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--bg-panel); border: 1px solid rgba(255,255,255,0.05); padding: 40px 20px; text-align: center; transition: 0.3s; position: relative; overflow: hidden; }
.f-box::after { content: ""; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--primary-cyan); transform: scaleX(0); transition: 0.3s; }
.f-box:hover::after { transform: scaleX(1); }
.f-box:hover { background: rgba(255,255,255,0.02); transform: translateY(-5px); }
.f-box img { width: 50px; height: 50px; margin: 0 auto 20px; filter: brightness(0) invert(1) drop-shadow(0 0 5px var(--primary-cyan)); }
.f-box h3 { font-size: 18px; color: var(--text-white); margin-bottom: 10px; }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; background: var(--bg-panel); padding: 50px; border-radius: 8px; border-left: 4px solid var(--primary-blue); box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.detail-box:nth-child(even) { border-left: none; border-right: 4px solid var(--shield-green); flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 30px; color: var(--text-white); margin-bottom: 20px; display: flex; align-items: center; gap: 15px; }
.d-text h3 i { font-size: 24px; color: var(--primary-cyan); }
.d-text p { font-size: 16px; margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 10px 20px; background: rgba(0, 240, 255, 0.1); border: 1px solid var(--primary-cyan); color: var(--primary-cyan); font-family: monospace; font-size: 18px; }
.d-visual { flex: 1; border: 1px solid rgba(255,255,255,0.1); padding: 10px; background: rgba(0,0,0,0.3); border-radius: 4px; }
.d-visual img { border-radius: 4px; opacity: 0.9; transition: 0.3s; }
.d-visual:hover img { opacity: 1; }

/* 数据背书 */
.data-sec { border-top: 1px solid rgba(255,255,255,0.05); border-bottom: 1px solid rgba(255,255,255,0.05); background: rgba(17, 24, 39, 0.8); padding: 80px 0; margin: 60px 0; position: relative; z-index: 10; }
.data-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-around; text-align: center; }
.data-item { position: relative; }
.data-item h4 { font-size: 60px; font-family: monospace; color: var(--primary-cyan); text-shadow: 0 0 20px rgba(0,240,255,0.5); margin-bottom: 10px; }
.data-item p { color: var(--text-white); font-size: 16px; letter-spacing: 1px; text-transform: uppercase; }

/* 浏览器对比 */
.compare-box { background: var(--bg-panel); border: 1px solid rgba(255,255,255,0.1); border-radius: 8px; overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: center; }
.compare-table th, .compare-table td { padding: 25px; border-bottom: 1px solid rgba(255,255,255,0.05); border-right: 1px solid rgba(255,255,255,0.05); }
.compare-table th { background: rgba(0,0,0,0.5); color: var(--text-white); font-weight: bold; letter-spacing: 1px; }
.compare-table td { color: var(--text-muted); }
.compare-table td.hl { color: var(--shield-green); font-weight: bold; text-shadow: 0 0 10px rgba(16,185,129,0.3); background: rgba(16,185,129,0.05); }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载区 */
.dl-wrap { display: flex; gap: 30px; justify-content: center; }
.dl-card { background: var(--bg-panel); border: 1px solid rgba(255,255,255,0.1); padding: 50px 30px; width: 32%; text-align: center; transition: 0.3s; position: relative; }
.dl-card::before { content: ""; position: absolute; top: 0; left: 0; width: 4px; height: 100%; background: var(--text-muted); transition: 0.3s; }
.dl-card:hover { transform: translateY(-10px); background: rgba(255,255,255,0.02); }
.dl-card.pro::before { background: var(--primary-cyan); box-shadow: 0 0 15px var(--primary-cyan); }
.dl-card h3 { font-size: 24px; color: var(--text-white); margin-bottom: 20px; }
.dl-card p { font-size: 14px; margin-bottom: 40px; height: 42px; line-height: 1.5; }
.dl-card .btn { width: 100%; font-size: 14px; padding: 14px 0; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.faq-box { background: rgba(0,0,0,0.3); border: 1px solid rgba(255,255,255,0.05); padding: 30px; border-radius: 4px; }
.faq-box h4 { font-size: 18px; color: var(--text-white); margin-bottom: 15px; display: flex; align-items: flex-start; gap: 10px; }
.faq-box h4::before { content: "►"; color: var(--primary-cyan); }

/* Footer */
.footer { text-align: center; padding: 60px 20px; border-top: 1px solid rgba(255,255,255,0.05); background: #000; position: relative; z-index: 10; font-size: 14px; letter-spacing: 1px; }