:root {
    --tunnel-bg: #050510; /* 深空背景 */
    --tunnel-glow: #00FF88; /* 科幻绿光 */
    --tunnel-blue: #00A3FF; /* 极速蓝轨 */
    --panel-bg: rgba(10, 15, 30, 0.7);
    --text-main: #E0F2FF;
    --text-muted: #8AA4C4;
    --border-glow: 0 0 15px rgba(0, 255, 136, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background-color: var(--tunnel-bg); color: var(--text-main); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 8px; }
ul { list-style: none; }

/* 隧道光轨背景 */
.tunnel-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; background: radial-gradient(circle at 50% 50%, transparent 20%, #050510 80%), repeating-conic-gradient(from 0deg at 50% 50%, rgba(0, 255, 136, 0.05) 0deg 10deg, transparent 10deg 20deg); opacity: 0.8; }
.light-trails { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; overflow: hidden; perspective: 1000px; }
.trail { position: absolute; width: 2px; height: 150px; background: linear-gradient(to bottom, transparent, var(--tunnel-glow)); animation: speed 2s linear infinite; }
.trail:nth-child(1) { left: 20%; animation-delay: 0s; }
.trail:nth-child(2) { left: 80%; animation-delay: 0.5s; background: linear-gradient(to bottom, transparent, var(--tunnel-blue)); }
.trail:nth-child(3) { left: 50%; width: 4px; animation-duration: 1s; }
@keyframes speed { 0% { transform: translateZ(-1000px) translateY(-500px); opacity: 0; } 50% { opacity: 1; } 100% { transform: translateZ(1000px) translateY(1000px); opacity: 0; } }

/* 导航 */
.header { background: rgba(5, 5, 16, 0.8); border-bottom: 1px solid rgba(0, 255, 136, 0.2); position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(10px); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 75px; padding: 0 20px; }
.logo { font-size: 24px; font-weight: 900; color: #FFF; display: flex; align-items: center; gap: 10px; text-transform: uppercase; letter-spacing: 2px; text-shadow: 0 0 10px var(--tunnel-glow); }
.logo img { width: 36px; height: 36px; filter: drop-shadow(0 0 5px var(--tunnel-glow)); }
.nav-links { display: flex; gap: 35px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--tunnel-glow); text-shadow: 0 0 8px var(--tunnel-glow); }

.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; position: relative; z-index: 2; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 15px 40px; border-radius: 4px; font-size: 16px; font-weight: 900; cursor: pointer; transition: 0.3s; text-transform: uppercase; letter-spacing: 2px; position: relative; overflow: hidden; }
.btn-primary { background: linear-gradient(90deg, var(--tunnel-blue), var(--tunnel-glow)); color: #000; border: none; box-shadow: 0 0 20px rgba(0, 255, 136, 0.4); }
.btn-primary::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent); transition: 0.5s; }
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover { box-shadow: 0 0 30px rgba(0, 255, 136, 0.6); transform: scale(1.05); }
.btn-outline { background: rgba(0, 0, 0, 0.5); color: var(--tunnel-glow); border: 1px solid var(--tunnel-glow); box-shadow: inset 0 0 10px rgba(0, 255, 136, 0.2); }
.btn-outline:hover { background: var(--tunnel-glow); color: #000; box-shadow: 0 0 20px var(--tunnel-glow); }

/* 首屏 Hero */
.hero { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 120px 20px 100px; max-width: 1000px; margin: 0 auto; position: relative; z-index: 2; perspective: 1000px; }
.hero-content { margin-bottom: 60px; animation: popIn 1s cubic-bezier(0.1, 1.5, 0.8, 1); }
@keyframes popIn { 0% { opacity: 0; transform: translateZ(-500px); } 100% { opacity: 1; transform: translateZ(0); } }
.hero-content h1 { font-size: 68px; font-weight: 900; color: #FFF; margin-bottom: 10px; line-height: 1.1; text-transform: uppercase; letter-spacing: 4px; text-shadow: 0 0 20px var(--tunnel-blue), 0 0 40px var(--tunnel-glow); }
.hero-content .subtitle { font-size: 28px; color: var(--tunnel-glow); font-weight: 700; margin-bottom: 30px; letter-spacing: 5px; }
.hero-content .desc { font-size: 16px; color: var(--text-muted); margin: 0 auto 40px; max-width: 600px; line-height: 1.8; }
.hero-btns { display: flex; justify-content: center; gap: 30px; }
.hero-visual { width: 100%; position: relative; transform-style: preserve-3d; }
.hero-visual img { width: 100%; border: 2px solid rgba(0, 255, 136, 0.5); box-shadow: 0 0 50px rgba(0, 163, 255, 0.4); transform: rotateX(15deg); transition: 0.5s; }
.hero-visual:hover img { transform: rotateX(0deg) scale(1.02); box-shadow: 0 0 80px rgba(0, 255, 136, 0.6); border-color: var(--tunnel-glow); }

/* 模块标题 */
.sec-title { text-align: center; font-size: 40px; font-weight: 900; color: #FFF; margin-bottom: 60px; text-transform: uppercase; letter-spacing: 3px; text-shadow: 0 0 15px var(--tunnel-blue); display: flex; align-items: center; justify-content: center; gap: 15px; }
.sec-title::before, .sec-title::after { content: ''; width: 40px; height: 3px; background: var(--tunnel-glow); box-shadow: 0 0 10px var(--tunnel-glow); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--panel-bg); padding: 40px 20px; text-align: center; border-radius: 8px; border: 1px solid rgba(0, 255, 136, 0.1); backdrop-filter: blur(5px); transition: 0.3s; }
.f-box:hover { border-color: var(--tunnel-glow); box-shadow: inset 0 0 20px rgba(0, 255, 136, 0.1), 0 0 20px rgba(0, 255, 136, 0.2); transform: translateY(-10px); }
.f-box img { width: 50px; height: 50px; margin: 0 auto 20px; filter: drop-shadow(0 0 10px var(--tunnel-glow)); }
.f-box h3 { font-size: 16px; font-weight: 800; color: #FFF; margin-bottom: 10px; }
.f-box p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 100px; background: linear-gradient(90deg, rgba(0,0,0,0.8), transparent); padding: 40px; border-left: 4px solid var(--tunnel-glow); }
.detail-box:nth-child(even) { flex-direction: row-reverse; background: linear-gradient(-90deg, rgba(0,0,0,0.8), transparent); border-left: none; border-right: 4px solid var(--tunnel-blue); }
.d-text { flex: 1; }
.d-text h3 { font-size: 32px; font-weight: 900; color: #FFF; margin-bottom: 20px; text-shadow: 0 0 10px rgba(255,255,255,0.5); }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 10px 20px; background: rgba(0, 255, 136, 0.1); border: 1px solid var(--tunnel-glow); color: var(--tunnel-glow); font-size: 20px; font-weight: 900; box-shadow: 0 0 15px rgba(0, 255, 136, 0.2); }
.d-visual { flex: 1.2; position: relative; }
.d-visual img { border: 1px solid rgba(0, 163, 255, 0.5); opacity: 0.8; transition: 0.3s; border-radius: 4px; }
.d-visual:hover img { opacity: 1; box-shadow: 0 0 30px rgba(0, 163, 255, 0.6); transform: scale(1.03); border-color: var(--tunnel-blue); }

/* 浏览器对比 */
.compare-box { background: var(--panel-bg); border: 1px solid rgba(0, 255, 136, 0.2); padding: 40px; border-radius: 8px; backdrop-filter: blur(10px); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 30px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.compare-table th { color: var(--tunnel-blue); font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 2px; }
.compare-table td { font-size: 15px; color: var(--text-main); }
.compare-table .hl { color: var(--tunnel-glow); font-weight: 900; background: rgba(0, 255, 136, 0.05); text-shadow: 0 0 5px rgba(0, 255, 136, 0.5); border-left: 1px solid rgba(0, 255, 136, 0.3); border-right: 1px solid rgba(0, 255, 136, 0.3); }
.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(--panel-bg); border: 1px solid rgba(0, 163, 255, 0.2); padding: 50px 30px; text-align: center; border-radius: 8px; transition: 0.3s; position: relative; overflow: hidden; }
.dl-card::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(0, 163, 255, 0.1) 0%, transparent 60%); opacity: 0; transition: 0.5s; }
.dl-card:hover { border-color: var(--tunnel-blue); box-shadow: 0 0 30px rgba(0, 163, 255, 0.2); transform: translateY(-10px); }
.dl-card:hover::before { opacity: 1; }
.dl-card.rec { border-color: var(--tunnel-glow); box-shadow: inset 0 0 20px rgba(0, 255, 136, 0.1); }
.dl-card.rec:hover { box-shadow: 0 0 40px rgba(0, 255, 136, 0.3); }
.dl-card h3 { font-size: 24px; font-weight: 900; color: #FFF; margin-bottom: 20px; position: relative; z-index: 2; }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 40px; height: 50px; position: relative; z-index: 2; }
.dl-card .btn { width: 100%; position: relative; z-index: 2; }

/* 数据背书 */
.data-sec { background: rgba(0,0,0,0.8); border-top: 1px solid rgba(0, 255, 136, 0.2); border-bottom: 1px solid rgba(0, 255, 136, 0.2); padding: 80px 20px; margin: 100px 0; position: relative; overflow: hidden; }
.data-sec::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(0, 255, 136, 0.05), transparent); animation: sweep 3s linear infinite; pointer-events: none; }
@keyframes sweep { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; position: relative; z-index: 2; }
.data-item { text-align: center; }
.data-item h4 { font-size: 60px; font-weight: 900; color: #FFF; text-shadow: 0 0 20px var(--tunnel-glow); margin-bottom: 10px; line-height: 1; }
.data-item p { font-size: 16px; font-weight: 700; color: var(--tunnel-blue); text-transform: uppercase; letter-spacing: 2px; }

/* FAQ */
.faq-grid { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-box { background: var(--panel-bg); border: 1px solid rgba(255,255,255,0.05); padding: 30px; border-radius: 8px; transition: 0.3s; }
.faq-box:hover { border-color: var(--tunnel-glow); background: rgba(0, 255, 136, 0.05); }
.faq-box h4 { font-size: 18px; font-weight: 800; color: #FFF; margin-bottom: 15px; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: '>>'; color: var(--tunnel-glow); font-weight: 900; }
.faq-box p { font-size: 15px; color: var(--text-muted); line-height: 1.8; }

/* Footer */
.footer { background: #020205; border-top: 1px solid rgba(0, 163, 255, 0.2); text-align: center; padding: 50px; color: var(--text-muted); font-size: 14px; margin-top: 80px; letter-spacing: 1px; }