/* 迅雷官网落地页样式 */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;color:#1a2332;background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;color:#0b1a36}
p{margin:0}
button{font:inherit;cursor:pointer;border:0;background:none}

:root{
  --primary:#2386EA;
  --primary-dark:#1a6cc0;
  --primary-soft:#e7f1fd;
  --bg:#ffffff;
  --bg-soft:#f6f9fd;
  --text:#1a2332;
  --text-soft:#5b6b85;
  --border:#e3eaf3;
  --radius:14px;
  --shadow-sm:0 2px 8px rgba(35,134,234,.08);
  --shadow-md:0 8px 28px rgba(35,134,234,.14);
}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 12px;z-index:9999;border-radius:8px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:999px;font-weight:600;font-size:14px;line-height:1;transition:all .2s ease;border:1px solid transparent;white-space:nowrap}
.btn-lg{padding:14px 28px;font-size:16px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--primary-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.btn-outline{background:rgba(255,255,255,.92);color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-ghost{color:var(--text);}
.os-icon{width:22px;height:22px;object-fit:contain;flex-shrink:0}
.btn-ghost:hover{color:var(--primary)}

/* 顶部 */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--border)}
.nav-wrap{display:flex;align-items:center;gap:24px;height:64px}
.logo{display:inline-flex;align-items:center}
.primary-nav{flex:1}
.primary-nav ul{display:flex;gap:28px}
.primary-nav a{font-size:15px;color:var(--text);font-weight:500;position:relative;padding:6px 0}
.primary-nav a:hover{color:var(--primary)}
.primary-nav a:hover::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--primary);border-radius:2px}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:36px;height:36px;align-items:center;justify-content:center;border-radius:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:.2s}
.mobile-menu{border-top:1px solid var(--border);background:#fff}
.mobile-menu ul{display:flex;flex-direction:column}
.mobile-menu a{display:block;padding:14px 20px;border-bottom:1px solid var(--border);font-size:15px}

/* Hero */
.hero{position:relative;overflow:hidden;color:#fff;min-height:620px;display:flex;align-items:center}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(11,26,54,.78) 0%,rgba(35,134,234,.55) 100%);z-index:-1}
.hero-inner{padding:80px 20px}
.eyebrow{display:inline-block;padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);font-size:13px;letter-spacing:.5px;margin-bottom:18px}
.hero h1{font-size:clamp(32px,5vw,56px);color:#fff;margin-bottom:18px;letter-spacing:-.5px}
.hero h1 .accent{background:linear-gradient(90deg,#a8d4ff,#fff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-desc{font-size:clamp(15px,1.6vw,18px);color:rgba(255,255,255,.9);margin-bottom:32px;max-width:680px}
.download-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:36px}
.hero-meta{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;max-width:720px}
.hero-meta li{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:14px 16px;backdrop-filter:blur(6px)}
.hero-meta strong{display:block;font-size:20px;color:#fff;font-weight:700}
.hero-meta span{font-size:12px;color:rgba(255,255,255,.78)}

/* Section 通用 */
.section{padding:80px 0}
.section-head{text-align:center;margin-bottom:48px}
.section-head h2{font-size:clamp(26px,3.4vw,38px);margin-bottom:12px}
.section-head p{color:var(--text-soft);font-size:16px}

/* 功能 */
.features{background:var(--bg-soft)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.25s ease;box-shadow:var(--shadow-sm)}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(35,134,234,.35)}
.feature-icon{width:52px;height:52px;border-radius:12px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{color:var(--text-soft);font-size:14.5px}

/* Showcase */
.showcase{background:#fff}
.showcase-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.showcase-text .eyebrow{background:var(--primary-soft);color:var(--primary);border:0;margin-bottom:14px}
.showcase-text h2{font-size:clamp(24px,3vw,34px);margin-bottom:14px}
.showcase-text > p{color:var(--text-soft);margin-bottom:18px}
.check-list{margin-bottom:24px}
.check-list li{position:relative;padding:8px 0 8px 28px;color:var(--text)}
.check-list li::before{content:"";position:absolute;left:0;top:14px;width:18px;height:18px;border-radius:50%;background:var(--primary) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'><path d='m9 16.2-3.5-3.5-1.4 1.4L9 19l11-11-1.4-1.4z'/></svg>") center/12px no-repeat}
.showcase-media img{border-radius:var(--radius);box-shadow:var(--shadow-md)}

/* VIP */
.vip{background:linear-gradient(180deg,var(--bg-soft) 0%,#fff 100%)}
.vip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.vip-card{position:relative;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;text-align:center;transition:.25s ease}
.vip-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.vip-card.featured{border-color:var(--primary);box-shadow:var(--shadow-md)}
.vip-card .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px}
.vip-card h3{font-size:20px;margin-bottom:12px}
.vip-card .price{font-size:42px;color:var(--primary);font-weight:700;margin:14px 0}
.vip-card .price span{font-size:18px;vertical-align:top;margin-right:2px}
.vip-card .price small{font-size:14px;color:var(--text-soft);font-weight:400}
.vip-card ul{margin-bottom:22px;text-align:left}
.vip-card ul li{padding:8px 0 8px 24px;position:relative;color:var(--text-soft);font-size:14.5px;border-bottom:1px dashed var(--border)}
.vip-card ul li:last-child{border-bottom:0}
.vip-card ul li::before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:700}

/* Cloud */
.cloud{background:linear-gradient(135deg,#0b1a36,#1a4a8a);color:#fff}
.cloud .eyebrow{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.2)}
.cloud h2{color:#fff;font-size:clamp(24px,3vw,34px);margin-bottom:14px}
.cloud > .container > div > p{color:rgba(255,255,255,.82);margin-bottom:22px}
.cloud-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.cloud-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.cloud-stats > div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:22px;text-align:center;backdrop-filter:blur(6px)}
.cloud-stats strong{display:block;font-size:30px;font-weight:700}
.cloud-stats span{font-size:13px;color:rgba(255,255,255,.75)}

/* FAQ */
.faq{background:#fff}
.faq-list{max-width:840px;margin:0 auto}
.faq-list details{border:1px solid var(--border);border-radius:12px;padding:18px 22px;margin-bottom:12px;background:#fff;transition:.2s}
.faq-list details[open]{border-color:var(--primary);box-shadow:var(--shadow-sm)}
.faq-list summary{cursor:pointer;font-weight:600;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--text)}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-size:22px;color:var(--primary);transition:.2s}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list details p{margin-top:12px;color:var(--text-soft);font-size:14.5px;line-height:1.75}
.faq-list a{color:var(--primary)}

/* Footer */
.site-footer{background:#0b1a36;color:rgba(255,255,255,.7);padding-top:60px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px}
.footer-brand img{filter:brightness(0) invert(1);margin-bottom:14px}
.footer-brand p{color:rgba(255,255,255,.6);font-size:13.5px;line-height:1.8}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer ul li{padding:6px 0}
.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:18px 0;font-size:13px;color:rgba(255,255,255,.5);text-align:center}

/* 响应式 */
@media (max-width:960px){
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .vip-grid{grid-template-columns:1fr;max-width:440px;margin:0 auto}
  .showcase-grid,.cloud-inner{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .primary-nav,.nav-actions{display:none}
  .nav-toggle{display:flex;margin-left:auto}
  .hero{min-height:auto}
  .hero-inner{padding:60px 20px}
  .hero-meta{grid-template-columns:repeat(2,1fr)}
  .download-cta .btn{flex:1 1 calc(50% - 12px);min-width:0;padding:12px 14px;font-size:14px}
  .section{padding:56px 0}
  .feature-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:20px}
}
@media (max-width:420px){
  .hero h1{font-size:30px}
  .download-cta .btn{flex:1 1 100%}
}

/* 偏好减弱动画 */
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .hero-video{display:none}
}