:root{
  --bg:#f5f5f7;
  --bg-alt:#fbfbfd;
  --card:#ffffff;
  --text:#1d1d1f;
  --muted:#6e6e73;
  --line:#e8e8ed;
  --grad:linear-gradient(135deg,#2997ff,#5e5ce6);
  --radius:20px;
  --shadow-sm:0 1px 2px rgba(0,0,0,.04),0 4px 16px rgba(0,0,0,.05);
  --shadow-lg:0 24px 48px -12px rgba(0,0,0,.16);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body:has(.mobile-cta){padding-bottom:84px}
a{color:inherit;text-decoration:none}
img{display:block}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* 吸顶导航 */
.site-header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  background:rgba(245,245,247,.72);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;letter-spacing:-.01em}
.logo-mark{width:26px;height:26px;border-radius:8px;background:var(--grad)}
.logo-accent{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.main-nav{display:flex;align-items:center;gap:30px;font-size:14px;color:var(--muted)}
.main-nav a{transition:color .2s}
.main-nav a:hover{color:var(--text)}
.nav-cta{
  padding:8px 18px;border-radius:980px;background:var(--grad);
  color:#fff!important;font-weight:600;
}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--text);cursor:pointer}

/* Hero */
.hero{position:relative;overflow:hidden;padding:104px 0 88px}
.hero-glow{position:absolute;border-radius:50%;filter:blur(48px);opacity:.55;pointer-events:none}
.hero-glow-a{width:420px;height:420px;top:-120px;left:-80px;background:radial-gradient(circle,rgba(41,151,255,.55),transparent 70%)}
.hero-glow-b{width:520px;height:520px;top:-60px;right:-120px;background:radial-gradient(circle,rgba(94,92,230,.5),transparent 70%)}
.hero-glow-c{width:360px;height:360px;bottom:-160px;left:38%;background:radial-gradient(circle,rgba(41,151,255,.35),transparent 70%)}
.hero-inner{position:relative;z-index:1;max-width:820px;margin:0 auto;text-align:center}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 18px;border-radius:980px;
  background:var(--card);border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
  font-size:14px;font-weight:600;color:var(--text);
  opacity:0;animation:fadeUp .7s .05s forwards;
}
.eyebrow-dot{width:8px;height:8px;border-radius:50%;background:var(--grad)}
.hero-title{
  margin-top:26px;
  font-size:clamp(44px,8vw,84px);
  line-height:1.05;letter-spacing:-.035em;font-weight:800;
  opacity:0;animation:fadeUp .7s .13s forwards;
}
.hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{
  margin:26px auto 0;max-width:640px;
  font-size:18px;color:var(--muted);
  opacity:0;animation:fadeUp .7s .21s forwards;
}
.hero-actions{
  margin-top:36px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap;
  opacity:0;animation:fadeUp .7s .29s forwards;
}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:15px 30px;border-radius:980px;
  font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 24px -8px rgba(94,92,230,.55)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px -8px rgba(94,92,230,.6)}
.btn-ghost{background:var(--card);border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.trust-chips{
  margin-top:32px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;
  list-style:none;
  opacity:0;animation:fadeUp .7s .37s forwards;
}
.chip{font-size:14px;color:var(--muted);padding:6px 14px;border-radius:980px;background:var(--card);border:1px solid var(--line)}

/* Section */
.section{padding:88px 0}
.section-alt{background:var(--bg-alt)}
.section-head{max-width:660px;margin:0 auto 52px;text-align:center}
.section-eyebrow{
  font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#5e5ce6;
}
.section-title{font-size:clamp(30px,4.5vw,44px);letter-spacing:-.02em;font-weight:800;margin-top:12px}
.section-sub{margin-top:16px;font-size:16px;color:var(--muted)}

/* 功能卡片 */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feature-card{
  background:var(--card);border-radius:var(--radius);padding:30px 26px;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.feature-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:transparent;
  background-image:linear-gradient(var(--card),var(--card)),var(--grad);
  background-origin:border-box;
  background-clip:padding-box,border-box;
}
.feature-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:48px;height:48px;border-radius:14px;
  background:var(--grad);color:#fff;font-weight:700;font-size:16px;letter-spacing:.02em;
}
.feature-title{font-size:20px;font-weight:700;margin-top:20px;letter-spacing:-.01em}
.feature-desc{margin-top:12px;font-size:14px;color:var(--muted)}
.feature-tags{list-style:none;margin-top:18px;display:flex;gap:8px;flex-wrap:wrap}
.feature-tags li{font-size:12px;color:#5e5ce6;background:rgba(94,92,230,.08);padding:4px 12px;border-radius:980px;font-weight:600}

/* 图片展示 */
.image-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.gallery-item{
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);
}
.gallery-item .img-frame{position:relative;aspect-ratio:16/9;overflow:hidden}
.gallery-item img{
  position:absolute;inset:0;width:auto;height:auto;
  object-fit:cover;transition:transform .4s;
}
.gallery-item:hover img{transform:scale(1.04)}
.gallery-item figcaption{padding:16px 18px;font-size:13px;color:var(--muted);font-weight:500}

/* 文章 */
.articles-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.article-card{
  background:var(--card);border-radius:var(--radius);padding:30px 28px;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);
  transition:transform .25s,box-shadow .25s;
}
.article-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.article-tag{font-size:12px;font-weight:700;color:#5e5ce6;background:rgba(94,92,230,.08);padding:4px 12px;border-radius:980px}
.article-title{font-size:20px;font-weight:700;margin-top:16px;letter-spacing:-.01em;line-height:1.35}
.article-excerpt{margin-top:12px;font-size:14px;color:var(--muted)}
.article-body{margin-top:12px;font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
.faq-item{
  background:var(--card);border-radius:16px;margin-bottom:14px;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);overflow:hidden;
}
.faq-item summary{
  list-style:none;cursor:pointer;padding:20px 24px;
  font-size:16px;font-weight:600;display:flex;justify-content:space-between;align-items:center;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:#5e5ce6;font-weight:400;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 24px 20px;font-size:15px;color:var(--muted)}

/* 退款 */
.refund-card{
  background:var(--card);border-radius:28px;padding:56px 40px;text-align:center;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);
  background-image:radial-gradient(circle at 50% -20%,rgba(94,92,230,.12),transparent 70%);
}
.refund-badge{
  display:inline-block;padding:8px 20px;border-radius:980px;
  background:var(--grad);color:#fff;font-size:13px;font-weight:700;letter-spacing:.02em;
}
.refund-title{font-size:clamp(26px,4vw,36px);font-weight:800;letter-spacing:-.02em;margin-top:22px}
.refund-desc{max-width:600px;margin:16px auto 30px;font-size:16px;color:var(--muted)}

/* 页脚 */
.footer{border-top:1px solid var(--line);padding:56px 0 40px;text-align:center}
.hot-search{font-size:13px;color:#a1a1a6;max-width:860px;margin:0 auto;line-height:1.8}
.footer-nav{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;margin:26px 0;font-size:14px;color:var(--muted)}
.footer-nav a:hover{color:var(--text)}
.footer-copy{font-size:12px;color:#a1a1a6;margin-top:20px}

/* 移动端悬浮下载栏 */
.mobile-cta{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;
  padding:12px 16px calc(12px + env(safe-area-inset-bottom));
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-top:1px solid var(--line);
}
.mobile-cta a{
  display:block;text-align:center;padding:16px;border-radius:980px;
  background:var(--grad);color:#fff;font-size:16px;font-weight:700;
}

/* 动画 */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}

/* 响应式 */
@media (max-width:960px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .image-gallery{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-toggle{display:block}
  .main-nav{
    position:absolute;top:68px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);
    padding:8px 24px 20px;display:none;
  }
  .main-nav.nav-open{display:flex}
  .main-nav a{padding:14px 0;font-size:16px}
  .nav-cta{text-align:center;margin-top:8px}
  .section{padding:60px 0}
  .hero{padding:72px 0 60px}
  .articles-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .mobile-cta{display:block}
}

/* 下载页 */
.dl-hero{padding:72px 0 44px;text-align:center}
.dl-title{font-size:clamp(32px,5.5vw,48px);font-weight:800;letter-spacing:-.02em;margin-top:12px}
.dl-sub{margin-top:16px;font-size:16px;color:var(--muted)}
.device-section{padding:0 0 80px}
.device-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.device-card{background:var(--card);border-radius:var(--radius);padding:36px 28px;text-align:center;box-shadow:var(--shadow-sm);border:1px solid var(--line);transition:transform .25s,box-shadow .25s}
.device-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.device-num{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:14px;background:var(--grad);color:#fff;font-weight:700;font-size:16px}
.device-name{font-size:24px;font-weight:800;margin-top:18px;letter-spacing:-.01em}
.device-desc{margin-top:12px;font-size:14px;color:var(--muted);min-height:42px}
.device-btn{display:block;margin-top:20px;padding:16px;border-radius:980px;background:var(--grad);color:#fff;font-weight:700;font-size:17px;box-shadow:0 10px 24px -8px rgba(94,92,230,.55);transition:transform .2s,box-shadow .2s}
.device-btn:hover{transform:translateY(-2px);box-shadow:0 16px 32px -8px rgba(94,92,230,.6)}

/* 退款页 */
.refund-form-section{padding:0 0 80px}
.refund-notice{max-width:560px;margin:0 auto 24px;padding:16px 20px;border-radius:14px;background:rgba(94,92,230,.08);color:#5e5ce6;font-weight:600;font-size:15px;text-align:center}
.refund-form{max-width:560px;margin:0 auto}
.form-field{margin-bottom:22px}
.form-field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px;color:var(--text)}
.form-field input,.form-field textarea{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:12px;font-size:16px;font-family:inherit;color:var(--text);background:var(--card);transition:border-color .2s}
.form-field input:focus,.form-field textarea:focus{outline:none;border-color:#5e5ce6}
.form-field textarea{min-height:130px;resize:vertical}
.form-submit{width:100%;padding:16px;border-radius:980px;background:var(--grad);color:#fff;font-size:17px;font-weight:700;border:none;cursor:pointer;box-shadow:0 10px 24px -8px rgba(94,92,230,.55);transition:transform .2s,box-shadow .2s}
.form-submit:hover{transform:translateY(-2px);box-shadow:0 16px 32px -8px rgba(94,92,230,.6)}
.form-note{margin-top:16px;text-align:center;font-size:14px;color:var(--muted)}

@media (max-width:960px){
  .device-cards{grid-template-columns:1fr}
}
@media (max-width:640px){
  .dl-hero{padding:48px 0 32px}
  .dl-sub{margin-top:12px;font-size:15px}
}