/* ============================================================
   智达恒通 · 首页旗舰设计系统 (Agnes-level dark)
   深空背景 / 极光渐变 / 玻璃拟态 / Inter + Noto Sans SC
   仅用于 index.html
   ============================================================ */

:root{
  --bg:#020a15;
  --bg-elevated:#0a0f1a;
  --bg-soft:#0d1320;
  --surface:rgba(255,255,255,.04);
  --surface-2:rgba(255,255,255,.08);
  --surface-3:rgba(255,255,255,.12);
  --ink:#ffffff;
  --ink-2:#e8edf5;
  --muted:#8b939c;
  --muted-2:#586068;
  --border:rgba(255,255,255,.10);
  --border-strong:rgba(255,255,255,.16);
  --accent:#3b6cff;
  --accent-2:#7c5cff;
  --accent-glow:rgba(59,108,255,.35);
  --grad:linear-gradient(135deg,#3b6cff 0%,#7c5cff 100%);
  --grad-text:linear-gradient(120deg,#9db4ff 0%,#d9c6ff 100%);
  --grad-aurora:radial-gradient(circle at 20% 30%,rgba(59,108,255,.28),transparent 45%),
                radial-gradient(circle at 80% 20%,rgba(124,92,255,.25),transparent 45%),
                radial-gradient(circle at 60% 80%,rgba(59,108,255,.18),transparent 40%);
  --radius:16px;
  --radius-lg:24px;
  --radius-sm:12px;
  --shadow:0 20px 50px -20px rgba(0,0,0,.55);
  --shadow-lg:0 40px 90px -30px rgba(0,0,0,.65);
  --maxw:1200px;
  --header-h:72px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,'Courier New',monospace;
  --ease:cubic-bezier(.4,.0,.2,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul{list-style:none}
h1,h2,h3,h4{line-height:1.15;font-weight:700;letter-spacing:-.03em;color:var(--ink)}
::selection{background:rgba(59,108,255,.30)}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:120px 0}
.section-sm{padding:80px 0}
.center{text-align:center}
.lead{color:var(--muted);font-size:18px;line-height:1.75}
.muted{color:var(--muted)}
.maxw-2xl{max-width:760px;margin-left:auto;margin-right:auto}
.maxw-xl{max-width:620px;margin-left:auto;margin-right:auto}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(2,10,21,.65);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(255,255,255,.08);
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.site-header.scrolled{background:rgba(2,10,21,.88);border-bottom-color:rgba(255,255,255,.14)}
.nav{display:flex;align-items:center;justify-content:space-between;width:100%}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:17px;color:#fff}
.brand .logo{
  width:40px;height:40px;border-radius:12px;background:var(--grad);
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;
  box-shadow:0 0 30px rgba(59,108,255,.45),0 8px 20px -8px rgba(59,108,255,.6);
}
.brand .sub{display:block;font-size:10.5px;color:var(--muted);font-weight:500;letter-spacing:.05em;margin-top:-3px}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  padding:10px 16px;border-radius:10px;font-size:14.5px;font-weight:500;color:var(--muted);
  transition:color .2s,background .2s;
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav-links a.active{color:#fff;background:rgba(255,255,255,.10)}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;padding:9px;border-radius:10px;color:#fff;background:rgba(255,255,255,.06)}
.nav-toggle:hover{background:rgba(255,255,255,.12)}

.mobile-menu{
  position:fixed;top:var(--header-h);left:0;right:0;z-index:99;
  background:rgba(2,10,21,.96);border-bottom:1px solid var(--border);
  padding:16px 20px 24px;display:none;flex-direction:column;gap:6px;
  backdrop-filter:blur(20px);
}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 14px;border-radius:10px;color:#fff;font-weight:500}
.mobile-menu a:hover{background:rgba(255,255,255,.08)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s,color .2s,border-color .2s;
  white-space:nowrap;border:1px solid transparent;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 0 28px rgba(59,108,255,.35),0 10px 26px -10px rgba(59,108,255,.6)}
.btn-primary:hover{box-shadow:0 0 38px rgba(59,108,255,.50),0 16px 34px -10px rgba(59,108,255,.7);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.22)}
.btn-ghost:hover{border-color:rgba(255,255,255,.45);background:rgba(255,255,255,.08);transform:translateY(-2px)}
.btn-soft{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.12)}
.btn-soft:hover{background:rgba(255,255,255,.14)}
.btn-lg{padding:15px 30px;font-size:16px;border-radius:14px}
.btn-block{width:100%}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}

/* ---------- Pills ---------- */
.pill{
  display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:100px;
  font-size:13px;font-weight:600;background:rgba(255,255,255,.08);color:#cdd6ff;
  border:1px solid rgba(255,255,255,.14);
}
.pill .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent)}
.pill.accent{background:var(--grad);color:#fff;border-color:transparent}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  padding:calc(var(--header-h) + 80px) 0 100px;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:var(--grad-aurora);
  animation:aurora 18s ease-in-out infinite alternate;
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 50% 0%,transparent 20%,var(--bg) 80%);
  pointer-events:none;
}
@keyframes aurora{
  0%{transform:translate(0,0) scale(1);opacity:.9}
  50%{transform:translate(-2%,2%) scale(1.05);opacity:1}
  100%{transform:translate(2%,-1%) scale(1);opacity:.9}
}
.hero-grid{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;
}
.hero-badge{margin-bottom:24px}
.hero h1{color:#fff;font-size:clamp(42px,5.5vw,68px);line-height:1.08;letter-spacing:-.035em;margin-bottom:24px}
.hero h1 .grad{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:rgba(255,255,255,.72);font-size:19px;max-width:560px;margin-bottom:36px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px}
.hero-trust{display:flex;flex-wrap:wrap;gap:18px;color:rgba(255,255,255,.55);font-size:13.5px}
.hero-trust span{display:inline-flex;align-items:center;gap:8px}
.hero-trust i{width:14px;height:14px;border-radius:3px;background:var(--grad);display:grid;place-items:center}
.hero-trust i::after{content:"";width:6px;height:6px;background:#fff;border-radius:1px}

/* Hero visual mockup */
.hero-visual{position:relative;perspective:1200px}
.hero-visual::before{
  content:"";position:absolute;inset:-60px -40px;
  background:radial-gradient(circle at 50% 50%,rgba(124,92,255,.25),transparent 60%);
  pointer-events:none;
}
.mock-frame{
  position:relative;z-index:2;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-lg);padding:20px;backdrop-filter:blur(20px);
  box-shadow:var(--shadow-lg);transform:rotateY(-8deg) rotateX(4deg);
  transition:transform .6s var(--ease);
}
.mock-frame:hover{transform:rotateY(-4deg) rotateX(2deg) translateY(-4px)}
.mock-bar{display:flex;gap:8px;margin-bottom:18px}
.mock-bar i{width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,.18)}
.mock-bar i:first-child{background:#ff5f57}
.mock-bar i:nth-child(2){background:#febc2e}
.mock-bar i:nth-child(3){background:#28c840}
.mock-msg{display:flex;gap:12px;margin-bottom:14px;align-items:flex-start}
.mock-msg .ava{width:34px;height:34px;border-radius:10px;background:var(--grad);flex:0 0 auto;display:grid;place-items:center;font-size:12px;font-weight:700;color:#fff}
.mock-msg .bubble{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.10);border-radius:14px;padding:12px 15px;font-size:14px;color:rgba(255,255,255,.9);line-height:1.6}
.mock-msg.bot .bubble{border-bottom-left-radius:4px}
.mock-msg.me{flex-direction:row-reverse}
.mock-msg.me .ava{background:var(--surface-2);color:var(--ink-2)}
.mock-msg.me .bubble{background:rgba(124,92,255,.22);border-color:rgba(124,92,255,.25);color:#fff;border-bottom-right-radius:4px}
.mock-input{
  margin-top:18px;display:flex;gap:10px;align-items:center;
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.10);border-radius:14px;padding:12px 14px;
}
.mock-input span{flex:1;color:var(--muted);font-size:14px}
.mock-input i{width:32px;height:32px;border-radius:10px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:18px}

.floating-cards{position:absolute;inset:0;pointer-events:none;z-index:3}
.float-card{
  position:absolute;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius);padding:14px 18px;backdrop-filter:blur(12px);
  box-shadow:0 20px 40px -15px rgba(0,0,0,.4);
  display:flex;align-items:center;gap:12px;font-size:13px;font-weight:600;
  animation:float 6s ease-in-out infinite;
}
.float-card .ic{width:32px;height:32px;border-radius:10px;background:var(--grad);display:grid;place-items:center;color:#fff}
.float-card.fc1{top:-20px;right:-30px;animation-delay:0s}
.float-card.fc2{bottom:60px;left:-50px;animation-delay:1.5s}
.float-card.fc3{top:40%;right:-60px;animation-delay:3s}
@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-12px)}
}

/* ---------- Logos / trust bar ---------- */
.trust-bar{
  position:relative;z-index:2;
  border-top:1px solid var(--border);border-bottom:1px solid var(--border);
  background:linear-gradient(180deg,rgba(255,255,255,.02),transparent);
}
.trust-bar .container{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.trust-bar p{font-size:13px;color:var(--muted);letter-spacing:.04em;text-transform:uppercase;font-weight:600}
.logos{display:flex;flex-wrap:wrap;gap:32px 56px;align-items:center;opacity:.85}
.logo-item{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink-2)}
.logo-item::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--grad)}

/* ---------- Section headers ---------- */
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
.h2{font-size:clamp(32px,4.5vw,48px);margin-bottom:18px}
.h3{font-size:22px}
.section-head{max-width:720px;margin:0 auto 72px;text-align:center}
.section-head .lead{margin-top:8px}

/* ---------- Cards & grids ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.glass-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:32px;transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s,background .35s;
}
.glass-card:hover{transform:translateY(-6px);border-color:var(--border-strong);background:var(--surface-2);box-shadow:var(--shadow)}
.glass-card .ic{
  width:52px;height:52px;border-radius:14px;display:grid;place-items:center;
  background:var(--grad);color:#fff;font-size:24px;margin-bottom:22px;
  box-shadow:0 12px 28px -12px rgba(59,108,255,.55);
}
.glass-card h3{font-size:20px;margin-bottom:10px}
.glass-card p{color:var(--muted);font-size:15.5px;line-height:1.7}
.glass-card .link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-weight:600;color:var(--accent);font-size:14.5px}
.glass-card .link:hover{gap:10px}

/* ---------- Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:28px;text-align:center;transition:transform .3s,border-color .3s;
}
.stat:hover{transform:translateY(-4px);border-color:var(--border-strong)}
.stat .num{font-size:clamp(32px,4vw,46px);font-weight:800;letter-spacing:-.03em;
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:var(--muted);font-size:14px;margin-top:8px}

/* ---------- Model cards ---------- */
.model-card{
  position:relative;border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:30px;background:var(--surface);overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;
}
.model-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--border-strong)}
.model-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);opacity:.7;
}
.model-card .badge{
  position:absolute;top:22px;right:22px;font-size:11px;font-weight:700;
  background:rgba(255,255,255,.08);color:var(--muted);padding:4px 10px;border-radius:100px;border:1px solid var(--border);
}
.model-card .mname{font-size:21px;font-weight:700;margin-bottom:4px}
.model-card .mtype{font-size:13px;color:var(--accent);font-weight:600;margin-bottom:14px}
.model-card .mdesc{color:var(--muted);font-size:15px;line-height:1.7;min-height:78px}
.model-card .mspecs{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.model-card .spec{font-size:12.5px;color:var(--muted);background:rgba(255,255,255,.06);border:1px solid var(--border);padding:5px 10px;border-radius:8px}

/* ---------- Solutions / big cards ---------- */
.solution-card{
  position:relative;min-height:300px;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--border);background:var(--surface);padding:40px;
  display:flex;flex-direction:column;justify-content:flex-end;transition:transform .35s,border-color .35s;
}
.solution-card:hover{transform:translateY(-6px);border-color:var(--border-strong)}
.solution-card::before{
  content:"";position:absolute;inset:0;background:var(--grad);opacity:.06;pointer-events:none;
}
.solution-card h3{font-size:24px;margin-bottom:10px;position:relative;z-index:2}
.solution-card p{color:var(--muted);font-size:15.5px;line-height:1.7;position:relative;z-index:2;max-width:460px}
.solution-card .tags{display:flex;gap:8px;margin-top:18px;position:relative;z-index:2}
.solution-card .tag{font-size:12px;font-weight:600;background:rgba(255,255,255,.08);border:1px solid var(--border);padding:5px 11px;border-radius:8px;color:var(--ink-2)}

/* ---------- Developer / API ---------- */
.dev-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.code-block{
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.code-block::before{
  content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(59,108,255,.08),transparent 50%);pointer-events:none;
}
.code-block pre{
  color:var(--ink-2);font-family:var(--mono);font-size:13px;line-height:1.8;margin:0;position:relative;z-index:2;overflow:auto;
}
.code-block code{color:#a6c7ff}
.code-block .c{color:var(--muted-2)}
.code-block .k{color:#d9c6ff}
.code-block .s{color:#a6ffb2}

/* ---------- Pricing ---------- */
.price-card{
  border:1px solid var(--border);border-radius:var(--radius-lg);padding:36px 32px;background:var(--surface);
  display:flex;flex-direction:column;transition:transform .35s,box-shadow .35s,border-color .35s;
}
.price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--border-strong)}
.price-card.featured{
  border-color:transparent;box-shadow:0 0 0 1px rgba(255,255,255,.14),var(--shadow-lg);
  background:linear-gradient(180deg,rgba(59,108,255,.12),rgba(124,92,255,.08));
  position:relative;
}
.price-card.featured::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius-lg);padding:1px;
  background:var(--grad);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;
  pointer-events:none;
}
.price-card .ribbon{
  position:absolute;top:20px;right:20px;font-size:12px;font-weight:700;
  background:var(--grad);color:#fff;padding:5px 12px;border-radius:100px;
}
.price-card h3{font-size:22px;margin-bottom:6px}
.price-card .pdesc{color:var(--muted);font-size:14.5px;min-height:44px}
.price-card .amount{font-size:46px;font-weight:800;letter-spacing:-.03em;margin:18px 0 4px}
.price-card .amount .per{font-size:15px;font-weight:500;color:var(--muted)}
.price-card .feat{margin:24px 0;display:flex;flex-direction:column;gap:13px;flex:1}
.price-card .feat li{position:relative;padding-left:28px;font-size:15px;color:var(--ink-2)}
.price-card .feat li::before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:800}
.price-card.featured .btn-primary{background:#fff;color:var(--accent);box-shadow:0 10px 26px -10px rgba(255,255,255,.25)}
.price-card.featured .btn-primary:hover{box-shadow:0 16px 34px -10px rgba(255,255,255,.35)}

/* ---------- CTA band ---------- */
.cta-section{position:relative}
.cta-band{
  position:relative;border-radius:var(--radius-lg);padding:72px 56px;text-align:center;overflow:hidden;
  background:linear-gradient(135deg,rgba(59,108,255,.14),rgba(124,92,255,.10));
  border:1px solid var(--border);
}
.cta-band::before{
  content:"";position:absolute;inset:0;background:var(--grad-aurora);opacity:.6;pointer-events:none;
}
.cta-band>*{position:relative;z-index:2}
.cta-band h2{font-size:clamp(28px,4vw,42px);margin-bottom:14px}
.cta-band p{color:var(--muted);max-width:600px;margin:0 auto 28px;font-size:17px}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);padding:80px 0 32px;background:var(--bg-elevated)}
.footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr 1fr;gap:40px}
.footer-grid .brand{margin-bottom:18px}
.footer-grid .fdesc{color:var(--muted);font-size:14.5px;line-height:1.7;max-width:320px}
.footer-col h4{font-size:14px;margin-bottom:18px;color:#fff;letter-spacing:.02em}
.footer-col a{display:block;color:var(--muted);font-size:14.5px;padding:7px 0;transition:color .2s}
.footer-col a:hover{color:var(--ink)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;
  border-top:1px solid var(--border);margin-top:56px;padding-top:24px;color:var(--muted);font-size:13.5px}
.footer-bottom .links{display:flex;gap:22px}
.footer-bottom .links a:hover{color:#fff}

/* ---------- Reveal animations ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.1s}
.reveal.d2{transition-delay:.2s}
.reveal.d3{transition-delay:.3s}
.reveal.d4{transition-delay:.4s}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero-visual{max-width:600px;margin:0 auto}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr 1fr}
  .footer-grid .brand-col{grid-column:1/-1}
  .dev-grid{grid-template-columns:1fr;gap:40px}
  .floating-cards{display:none}
}
@media (max-width:760px){
  .section{padding:72px 0}
  .nav-links,.nav-cta .desktop-only{display:none}
  .nav-toggle{display:inline-flex}
  .grid-2,.grid-3,.grid-4,.stats{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:clamp(34px,10vw,48px)}
  .hero-cta{flex-direction:column;align-items:stretch}
  .btn-lg{width:100%;justify-content:center}
  .cta-band{padding:48px 24px}
  .container{padding:0 18px}
  .mock-frame{transform:none}
  .mock-frame:hover{transform:translateY(-4px)}
}