:root {
    --bg-base: #0a0a0a;
    --bg-panel: #141414;
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --speed-orange: #FF4B2B;
    --speed-red: #FF416C;
    --glow-orange: rgba(255, 75, 43, 0.6);
    --border-line: rgba(255, 75, 43, 0.2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: "Microsoft YaHei", -apple-system, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* 引擎流光背景 */
.speed-lines {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: 
        linear-gradient(90deg, transparent 0%, rgba(255, 75, 43, 0.05) 50%, transparent 100%);
    background-size: 200% 100%;
    animation: flowLight 3s infinite linear;
    z-index: -2;
    pointer-events: none;
}
@keyframes flowLight {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 */
.header {
    background: rgba(10, 10, 10, 0.9); border-bottom: 1px solid var(--border-line);
    position: sticky; top: 0; z-index: 1000; padding: 15px 0; backdrop-filter: blur(10px);
}
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; }
.logo { font-size: 24px; font-weight: 900; color: #FFF; display: flex; align-items: center; gap: 12px; font-style: italic; }
.logo-icon { width: 40px; height: 40px; box-shadow: 0 0 15px var(--glow-orange); border-radius: 50%; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 16px; font-weight: bold; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--speed-orange); text-shadow: 0 0 8px var(--glow-orange); }

/* 极速倾斜按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 14px 40px;
    font-size: 18px; font-weight: 900; cursor: pointer; transition: 0.3s;
    text-transform: uppercase; letter-spacing: 2px;
    transform: skewX(-15deg); border: 2px solid transparent;
}
.btn span { transform: skewX(15deg); }
.btn-primary {
    background: linear-gradient(90deg, var(--speed-red), var(--speed-orange));
    color: #fff; box-shadow: 0 0 20px var(--glow-orange); border: none;
}
.btn-primary:hover { box-shadow: 0 0 40px var(--glow-orange); filter: brightness(1.2); }
.btn-outline {
    background: transparent; color: var(--speed-orange); border-color: var(--speed-orange);
}
.btn-outline:hover { background: rgba(255, 75, 43, 0.1); box-shadow: 0 0 15px var(--glow-orange); }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; position: relative; z-index: 1; }
.sec-title { text-align: center; font-size: 40px; font-weight: 900; font-style: italic; margin-bottom: 10px; color: #FFF; letter-spacing: 2px; }
.sec-title span { color: var(--speed-orange); }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); margin-bottom: 60px; letter-spacing: 1px; }

/* Hero区 */
.hero { text-align: center; padding: 100px 20px 80px; position: relative; }
.hero::after {
    content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 600px; height: 600px; background: radial-gradient(circle, rgba(255, 75, 43, 0.15) 0%, transparent 70%);
    z-index: -1;
}
.hero h1 { font-size: 72px; font-weight: 900; font-style: italic; margin-bottom: 20px; background: linear-gradient(90deg, #FFF, var(--speed-orange)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -2px; }
.hero .subtitle { font-size: 24px; color: var(--text-muted); margin-bottom: 50px; font-weight: bold; letter-spacing: 4px; }
.hero-btns { display: flex; justify-content: center; gap: 30px; margin-bottom: 60px; }
.hero-visual { max-width: 900px; margin: 0 auto; position: relative; }
.hero-visual img { border: 2px solid var(--border-line); box-shadow: 0 0 50px rgba(255, 75, 43, 0.3); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { text-align: center; padding: 30px 15px; background: var(--bg-panel); border: 1px solid var(--border-line); transform: skewX(-5deg); transition: 0.3s; }
.f-box > div { transform: skewX(5deg); }
.f-box:hover { border-color: var(--speed-orange); box-shadow: 0 0 20px var(--glow-orange); transform: skewX(-5deg) translateY(-10px); }
.f-box img { width: 60px; height: 60px; margin: 0 auto 20px; filter: drop-shadow(0 0 10px var(--speed-orange)); }
.f-box h3 { font-size: 18px; font-weight: bold; margin-bottom: 10px; color: #FFF; }
.f-box p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 50px; margin-bottom: 80px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 36px; font-weight: 900; font-style: italic; margin-bottom: 20px; color: var(--speed-orange); }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 12px 25px; background: rgba(255, 75, 43, 0.1); border-left: 4px solid var(--speed-orange); color: #FFF; font-weight: bold; font-style: italic; font-size: 18px; letter-spacing: 1px; }
.d-visual { flex: 1; position: relative; }
.d-visual img { filter: contrast(1.1); box-shadow: 0 0 30px rgba(0,0,0,0.8); }

/* 浏览器对比 */
.compare-table { width: 100%; border-collapse: separate; border-spacing: 0 10px; text-align: left; }
.compare-table th { padding: 15px 20px; color: var(--text-muted); font-weight: bold; letter-spacing: 1px; }
.compare-table td { padding: 20px; background: var(--bg-panel); border-top: 1px solid var(--border-line); border-bottom: 1px solid var(--border-line); }
.compare-table td:first-child { border-left: 1px solid var(--border-line); }
.compare-table td:last-child { border-right: 1px solid var(--border-line); }
.compare-table .hl { color: var(--speed-orange); font-weight: bold; text-shadow: 0 0 8px var(--glow-orange); border-color: var(--speed-orange); background: rgba(255, 75, 43, 0.05); }

/* 数据背书 */
.data-sec { background: linear-gradient(90deg, #0f0f0f, #1a0805, #0f0f0f); border-top: 2px solid var(--speed-orange); border-bottom: 2px solid var(--speed-orange); padding: 80px 0; margin: 60px 0; box-shadow: 0 0 40px rgba(255, 75, 43, 0.2); }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; align-items: center; text-align: center; }
.data-item h4 { font-size: 56px; font-weight: 900; font-style: italic; color: var(--speed-orange); text-shadow: 0 0 20px var(--glow-orange); }
.data-item p { font-size: 16px; color: #FFF; margin-top: 5px; font-weight: bold; letter-spacing: 2px; }
.data-icon { width: 80px; height: 80px; filter: drop-shadow(0 0 15px var(--speed-orange)); }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { padding: 40px 30px; text-align: center; background: var(--bg-panel); border: 1px solid var(--border-line); transition: 0.3s; position: relative; }
.dl-card:hover { border-color: var(--speed-orange); box-shadow: 0 0 30px var(--glow-orange); transform: translateY(-10px); }
.dl-card h3 { font-size: 26px; font-weight: 900; font-style: italic; margin-bottom: 15px; color: #FFF; }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; }
.dl-card.pro { border-color: var(--speed-orange); background: linear-gradient(180deg, rgba(255, 75, 43, 0.1) 0%, transparent 100%); }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; }
.faq-item { margin-bottom: 20px; padding: 25px; background: var(--bg-panel); border-left: 3px solid var(--speed-orange); }
.faq-item h4 { font-size: 18px; color: #FFF; margin-bottom: 10px; font-weight: bold; }
.faq-item p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }

/* Footer */
.footer { padding: 40px 20px; text-align: center; border-top: 1px solid var(--border-line); color: var(--text-muted); font-size: 14px; background: #050505; margin-top: 50px; letter-spacing: 1px; }