/* ============ 主题变量 ============ */
:root,
[data-theme="purple-light"]{
  --purple-1:#7b5cff;
  --purple-2:#a06bff;
  --purple-3:#5b2bd6;
  --bg-1:#efeaff;
  --bg-2:#f7f0ff;
  --bg-3:#e3d6ff;
  --text:#241a3a;
  --muted:#5b5276;
  --glass:rgba(255,255,255,.55);
  --glass-strong:rgba(255,255,255,.72);
  --glass-soft:rgba(255,255,255,.38);
  --border:rgba(123,92,255,.28);
  --shadow:0 18px 50px rgba(91,43,214,.18);
  --blob-1:rgba(160,107,255,.55);
  --blob-2:rgba(255,138,217,.45);
  --blob-3:rgba(95,158,255,.45);
  --blob-4:rgba(196,140,255,.50);
}

[data-theme="purple-dark"]{
  --purple-1:#8a6bff;
  --purple-2:#b98bff;
  --purple-3:#3a1d8a;
  --bg-1:#1a0f33;
  --bg-2:#241046;
  --bg-3:#120a24;
  --text:#f2ecff;
  --muted:#b9a9e6;
  --glass:rgba(46,28,92,.45);
  --glass-strong:rgba(54,34,104,.62);
  --glass-soft:rgba(40,24,80,.35);
  --border:rgba(170,130,255,.30);
  --shadow:0 22px 60px rgba(10,4,30,.55);
  --blob-1:rgba(138,107,255,.55);
  --blob-2:rgba(255,122,209,.40);
  --blob-3:rgba(86,140,255,.42);
  --blob-4:rgba(190,130,255,.48);
}

/* ============ 基础 ============ */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 800px at 15% -10%, var(--bg-2), transparent 60%),
    radial-gradient(1000px 700px at 110% 10%, var(--bg-1), transparent 55%),
    linear-gradient(160deg,var(--bg-3),var(--bg-1));
  min-height:100vh;
  overflow-x:hidden;
  transition:background .4s ease,color .4s ease;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ============ 液态玻璃背景 ============ */
.liquid{position:fixed;inset:0;z-index:-1;overflow:hidden;filter:saturate(115%)}
.blob{
  position:absolute;border-radius:50%;filter:blur(70px);opacity:.9;
  mix-blend-mode:screen;animation:float 18s ease-in-out infinite;
}
[data-theme="purple-light"] .blob{mix-blend-mode:multiply;opacity:.75}
.b1{width:42vw;height:42vw;left:-8vw;top:-6vw;background:var(--blob-1);animation-delay:0s}
.b2{width:38vw;height:38vw;right:-6vw;top:8vw;background:var(--blob-2);animation-delay:-4s}
.b3{width:46vw;height:46vw;left:18vw;bottom:-14vw;background:var(--blob-3);animation-delay:-8s}
.b4{width:30vw;height:30vw;right:12vw;bottom:2vw;background:var(--blob-4);animation-delay:-12s}
@keyframes float{
  0%{transform:translate3d(0,0,0) scale(1)}
  33%{transform:translate3d(4vw,3vw,0) scale(1.08)}
  66%{transform:translate3d(-3vw,5vw,0) scale(.96)}
  100%{transform:translate3d(0,0,0) scale(1)}
}
.grain{
  position:absolute;inset:0;opacity:.05;background-image:
  radial-gradient(rgba(255,255,255,.8) 1px,transparent 1px);
  background-size:3px 3px;mix-blend-mode:overlay;
}

/* ============ 玻璃通用 ============ */
.glass{
  background:var(--glass);
  backdrop-filter:blur(22px) saturate(140%);
  -webkit-backdrop-filter:blur(22px) saturate(140%);
  border:1px solid var(--border);
  border-radius:24px;
  box-shadow:var(--shadow);
}
.glass-soft{
  background:var(--glass-soft);
  backdrop-filter:blur(14px) saturate(130%);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  border:1px solid var(--border);
  border-radius:18px;
}

/* ============ 导航（毛玻璃） ============ */
.nav{
  position:sticky;top:0;z-index:200;
  background:var(--glass-strong);
  backdrop-filter:blur(18px) saturate(150%);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1180px;margin:0 auto;padding:12px 18px;
  display:flex;align-items:center;gap:14px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:.5px;font-size:18px}
.logo-dot{width:14px;height:14px;border-radius:50%;
  background:linear-gradient(135deg,var(--purple-1),var(--purple-2));
  box-shadow:0 0 18px var(--purple-1)}
.menu{display:flex;gap:8px;margin-left:10px}
.menu a{
  padding:9px 14px;border-radius:999px;font-size:14px;color:var(--muted);
  transition:.25s;
}
.menu a:hover{color:var(--text);background:var(--glass-soft)}
.theme-btn{
  margin-left:auto;min-height:42px;padding:0 16px;border-radius:999px;cursor:pointer;
  border:1px solid var(--border);background:var(--glass-soft);color:var(--text);
  font-size:14px;transition:.25s;
}
.theme-btn:hover{background:var(--glass)}
.nav-toggle{display:none;margin-left:auto;width:44px;height:40px;border:0;background:transparent;cursor:pointer;flex-direction:column;gap:5px;justify-content:center;align-items:center}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px}

/* ============ 布局 ============ */
main{max-width:1180px;margin:0 auto;padding:0 18px}
.section{padding:64px 0}
.sec-head{text-align:center;margin-bottom:28px}
.sec-head h2{font-size:clamp(24px,3vw,34px);margin:0 0 8px}
.sec-sub{color:var(--muted);margin:0}

/* Hero */
.hero{padding:90px 0 40px}
.hero-card{padding:46px 40px;text-align:center}
.kicker{letter-spacing:2px;text-transform:uppercase;color:var(--purple-2);font-size:13px;margin:0 0 14px}
.hero h1{
  font-size:clamp(30px,5vw,56px);line-height:1.1;margin:0 0 16px;
  background:linear-gradient(120deg,var(--text),var(--purple-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{color:var(--muted);font-size:clamp(15px,1.6vw,18px);max-width:760px;margin:0 auto 26px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{min-height:46px;padding:0 26px;border-radius:999px;display:inline-flex;align-items:center;font-weight:700;cursor:pointer;border:1px solid transparent;transition:.25s}
.btn.primary{background:linear-gradient(135deg,var(--purple-1),var(--purple-2));color:#fff;box-shadow:0 12px 30px rgba(123,92,255,.45)}
.btn.primary:hover{transform:translateY(-2px)}
.btn.ghost{background:var(--glass-soft);border-color:var(--border);color:var(--text)}
.btn.ghost:hover{background:var(--glass)}
.ver{margin-top:18px;font-size:12px;color:var(--muted)}

/* ============ 轮播 ============ */
.carousel{position:relative;padding:18px;border-radius:28px;overflow:hidden}
.slides{position:relative;width:100%;aspect-ratio:16/9;border-radius:18px;overflow:hidden;background:rgba(0,0,0,.15)}
.slide{position:absolute;inset:0;opacity:0;transform:scale(1.02);transition:opacity .8s ease,transform .8s ease}
.slide.active{opacity:1;transform:scale(1)}
.slide img{width:100%;height:100%;object-fit:cover}
.car-btn{
  position:absolute;top:50%;transform:translateY(-50%);z-index:5;
  width:52px;height:52px;border-radius:50%;font-size:26px;line-height:1;cursor:pointer;
  border:1px solid var(--border);background:var(--glass-strong);color:var(--text);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:.25s;
}
.car-btn:hover{background:var(--glass)}
.car-btn.prev{left:18px}
.car-btn.next{right:18px}
.car-caption{
  position:absolute;left:18px;bottom:64px;z-index:5;padding:10px 16px;max-width:70%;
  font-size:14px;color:var(--text);
}
.car-dots{position:absolute;left:0;right:0;bottom:30px;z-index:5;display:flex;gap:8px;justify-content:center}
.car-dots button{width:10px;height:10px;border-radius:50%;border:0;cursor:pointer;background:var(--border);transition:.25s}
.car-dots button.active{width:26px;border-radius:999px;background:linear-gradient(135deg,var(--purple-1),var(--purple-2))}
.car-bar{position:absolute;right:18px;bottom:24px;z-index:6;display:flex;align-items:center;gap:10px;padding:8px 12px}
.car-play{min-height:36px;padding:0 14px;border-radius:999px;cursor:pointer;border:1px solid var(--border);background:var(--glass-soft);color:var(--text)}
.car-status{font-size:12px;color:var(--muted)}

/* ============ 网格卡片 ============ */
.grid{display:grid;gap:22px;grid-template-columns:repeat(3,1fr)}
.card{padding:0;overflow:hidden}
.card-media{width:100%;aspect-ratio:var(--ar,16/10);border-top-left-radius:24px;border-top-right-radius:24px}
.card h3{margin:18px 20px 6px;font-size:18px}
.card p{margin:0 20px 22px;color:var(--muted);font-size:14px;line-height:1.7}

/* 关于 */
.about{padding:40px}
.about h2{margin:0 0 12px}
.about p{color:var(--muted);line-height:1.9;margin:0 0 22px}
.stats{display:flex;flex-wrap:wrap;gap:26px;list-style:none;padding:0;margin:0}
.stats li{display:flex;flex-direction:column}
.stats strong{font-size:26px;background:linear-gradient(120deg,var(--purple-1),var(--purple-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{font-size:13px;color:var(--muted)}

/* 联络 */
.contact{padding:34px}
.pill-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:20px}
.pill{padding:11px 22px;border-radius:999px;background:var(--glass-soft);border:1px solid var(--border);font-weight:700;transition:.25s}
.pill:hover{background:var(--glass);transform:translateY(-2px)}
.copy-row{display:flex;gap:10px;flex-wrap:wrap}
.copy-row input{flex:1;min-width:220px;min-height:44px;padding:0 14px;border-radius:12px;border:1px solid var(--border);background:var(--glass-soft);color:var(--text)}
.copy-row button{min-height:44px;padding:0 18px;border-radius:12px;cursor:pointer;border:0;color:#fff;background:linear-gradient(135deg,var(--purple-1),var(--purple-2))}
.hint{color:var(--muted);font-size:13px;margin-top:14px}
.hint code{background:var(--glass-soft);padding:2px 6px;border-radius:6px}

/* 页脚 */
.foot{max-width:1180px;margin:40px auto;padding:22px 18px;text-align:center;color:var(--muted);font-size:13px;border-radius:18px}

/* 回到顶部 */
.back-top{
  position:fixed;right:18px;bottom:18px;z-index:300;width:48px;height:48px;border-radius:50%;cursor:pointer;
  border:1px solid var(--border);background:var(--glass-strong);color:var(--text);font-size:20px;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);opacity:0;pointer-events:none;transition:.3s;
}
.back-top.show{opacity:1;pointer-events:auto}

/* 滚动揭示 */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:980px){
  .grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .nav-toggle{display:flex}
  .menu{
    position:absolute;top:64px;left:0;right:0;flex-direction:column;gap:6px;
    padding:14px 18px;background:var(--glass-strong);
    backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
    border-bottom:1px solid var(--border);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.25s;
  }
  .menu.open{transform:none;opacity:1;pointer-events:auto}
  .theme-btn{margin-left:auto}
  .hero{padding:60px 0 30px}
  .hero-card{padding:32px 20px}
  .grid{grid-template-columns:1fr}
  .slides{aspect-ratio:4/3}
  .car-caption{bottom:58px;max-width:84%}
  .car-btn{width:44px;height:44px;font-size:22px}
  .about,.contact{padding:26px}
}
@media (min-width:761px) and (max-width:1024px){
  .slides{aspect-ratio:16/10}
}
@media (prefers-reduced-motion:reduce){
  .blob{animation:none}
  .reveal{transition:none;opacity:1;transform:none}
  html{scroll-behavior:auto}
}