:root {
    --primary: #06b6d4; /* 极速青光 */
    --primary-hover: #0891b2;
    --accent: #3b82f6; /* 电光蓝 */
    --bg-dark: #020617; /* 极夜黑 */
    --bg-card: rgba(15, 23, 42, 0.8);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(6, 182, 212, 0.3);
}

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

/* 速度线条 & 光束背景 */
.speed-bg {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -2;
    background: var(--bg-dark);
}
.speed-lines {
    position: absolute; top: 0; left: -50%; width: 200%; height: 100%;
    background: repeating-linear-gradient(90deg, transparent, transparent 100px, rgba(6,182,212,0.05) 100px, rgba(6,182,212,0.05) 102px);
    transform: skewX(-25deg);
    animation: moveSpeed 1s linear infinite;
}
@keyframes moveSpeed { from { transform: skewX(-25deg) translateX(0); } to { transform: skewX(-25deg) translateX(-102px); } }
.light-beam {
    position: absolute; top: -20%; left: 30%; width: 300px; height: 140%;
    background: linear-gradient(90deg, transparent, rgba(6,182,212,0.15), transparent);
    transform: rotate(25deg); filter: blur(30px); pointer-events: none;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 10; }

/* 导航 */
header { 
    background: rgba(2, 6, 23, 0.85); backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: sticky; top: 0; z-index: 100;
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 72px; }
.logo-area { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 26px; font-weight: 900; color: #fff; font-style: italic; letter-spacing: 1px; }
.logo span { color: var(--primary); }
.pc-badge { border: 1px solid var(--primary); color: var(--primary); padding: 2px 8px; border-radius: 4px; font-size: 12px; font-style: normal; font-weight: bold; box-shadow: 0 0 10px rgba(6,182,212,0.3); }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 600; text-transform: uppercase; color: var(--text-muted); font-style: italic; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); text-shadow: 0 0 8px var(--primary); }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 14px 36px; border-radius: 4px; font-weight: 800; font-size: 16px;
    font-style: italic; letter-spacing: 1px; cursor: pointer; transition: 0.3s;
    position: relative; overflow: hidden; border: none;
}
.btn::after {
    content: ''; position: absolute; top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: skewX(-25deg); transition: 0s;
}
.btn:hover::after { animation: flash 0.5s forwards; }
@keyframes flash { 100% { left: 200%; } }
.btn-primary { background: linear-gradient(90deg, var(--accent), var(--primary)); color: #fff; box-shadow: 0 0 20px rgba(6,182,212,0.4); }
.btn-primary:hover { box-shadow: 0 0 30px rgba(6,182,212,0.8); transform: translateY(-2px); }
.btn-outline { background: rgba(255,255,255,0.05); color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: rgba(6,182,212,0.1); }

/* Hero */
.hero { padding: 120px 0 80px; text-align: center; }
.hero h1 { font-size: 68px; font-weight: 900; font-style: italic; line-height: 1.1; margin-bottom: 20px; text-shadow: 0 10px 20px rgba(0,0,0,0.8); }
.hero h1 span { color: var(--primary); text-shadow: 0 0 30px rgba(6,182,212,0.5); }
.hero p { font-size: 22px; color: var(--text-muted); margin-bottom: 50px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-img-wrap {
    max-width: 900px; margin: 0 auto; border: 2px solid var(--border-color); border-radius: 12px;
    box-shadow: 0 0 50px rgba(6,182,212,0.2), inset 0 0 20px rgba(6,182,212,0.1);
    transform: perspective(1000px) rotateX(5deg) scale(0.95); transition: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.hero-img-wrap:hover { transform: perspective(1000px) rotateX(0) scale(1); box-shadow: 0 0 80px rgba(6,182,212,0.4); }

/* 模块通用 */
section { padding: 90px 0; border-bottom: 1px solid rgba(255,255,255,0.02); }
.sec-title { text-align: center; font-size: 40px; font-weight: 900; font-style: italic; margin-bottom: 60px; color: #fff; }
.sec-title span { color: var(--primary); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-card { background: var(--bg-card); border: 1px solid rgba(255,255,255,0.05); padding: 30px 20px; text-align: center; border-radius: 8px; backdrop-filter: blur(10px); transition: 0.3s; transform: skewX(-5deg); }
.f-card:hover { border-color: var(--primary); transform: skewX(-5deg) translateY(-10px); box-shadow: 0 10px 30px rgba(6,182,212,0.2); }
.f-card .f-inner { transform: skewX(5deg); }
.f-card img { width: 50px; height: 50px; margin: 0 auto 15px; filter: drop-shadow(0 0 5px var(--primary)); }
.f-card h3 { font-size: 18px; font-weight: 800; font-style: italic; margin-bottom: 10px; color: #fff; }
.f-card p { font-size: 13px; color: var(--text-muted); }

/* 详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-box:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 32px; font-weight: 900; font-style: italic; margin-bottom: 20px; color: #fff; border-left: 5px solid var(--primary); padding-left: 15px; }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; }
.d-tag { display: inline-block; background: rgba(6,182,212,0.1); color: var(--primary); font-weight: bold; font-style: italic; padding: 6px 15px; border-radius: 4px; border: 1px solid var(--border-color); }
.d-img { flex: 1; border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); border: 1px solid rgba(255,255,255,0.1); position: relative; }
.d-img::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; box-shadow: inset 0 0 20px rgba(6,182,212,0.3); pointer-events: none; }

/* 对比 */
.compare-box { background: var(--bg-card); border-radius: 12px; padding: 40px; border: 1px solid rgba(255,255,255,0.05); }
.compare-tb { width: 100%; border-collapse: collapse; text-align: center; }
.compare-tb th, .compare-tb td { padding: 20px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.compare-tb th { font-size: 16px; font-weight: 800; font-style: italic; color: var(--text-muted); }
.compare-tb .hl { color: var(--primary); font-weight: 900; font-size: 18px; background: rgba(6,182,212,0.05); }

/* 下载版本区 */
.version-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card { background: var(--bg-card); border: 1px solid rgba(255,255,255,0.1); padding: 50px 30px; text-align: center; border-radius: 12px; transition: 0.3s; position: relative; overflow: hidden; }
.v-card:hover { border-color: var(--primary); box-shadow: 0 0 40px rgba(6,182,212,0.15); transform: translateY(-5px); }
.v-card.spotlight { background: linear-gradient(180deg, rgba(6,182,212,0.1) 0%, var(--bg-card) 100%); border-color: var(--primary); box-shadow: 0 0 30px rgba(6,182,212,0.2); }
.v-card.spotlight::before { content: '光速推荐'; position: absolute; top: 15px; right: -30px; background: var(--primary); color: #000; font-weight: 900; font-style: italic; padding: 5px 35px; transform: rotate(45deg); font-size: 12px; box-shadow: 0 0 10px rgba(0,0,0,0.5); }
.v-card h3 { font-size: 28px; font-weight: 900; font-style: italic; margin-bottom: 15px; color: #fff; }
.v-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 42px; }

/* 数据展示 */
.data-sec { background: rgba(0,0,0,0.5); border-top: 1px solid rgba(6,182,212,0.2); border-bottom: 1px solid rgba(6,182,212,0.2); }
.data-flex { display: flex; justify-content: space-around; flex-wrap: wrap; text-align: center; }
.data-item h4 { font-size: 60px; font-weight: 900; font-style: italic; color: var(--text-main); margin-bottom: 5px; text-shadow: 0 0 20px rgba(6,182,212,0.5); }
.data-item h4 span { color: var(--primary); }
.data-item p { font-size: 16px; color: var(--primary); font-weight: bold; letter-spacing: 2px; text-transform: uppercase; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.faq-box { background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05); padding: 25px; border-radius: 8px; border-left: 3px solid var(--primary); transition: 0.3s; }
.faq-box:hover { background: rgba(6,182,212,0.05); }
.faq-box h4 { font-size: 16px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.faq-box p { font-size: 14px; color: var(--text-muted); }

footer { padding: 40px 0; text-align: center; color: var(--text-muted); font-size: 13px; background: #000; }