/* 宇天科技 a1 官方品牌站 — 轻量、无外部依赖 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#060b14;
  --bg2:#0c1424;
  --card:rgba(255,255,255,.04);
  --border:rgba(0,212,255,.12);
  --cyan:#00d4ff;
  --blue:#0066ff;
  --text:#e8eef7;
  --muted:#8b9cb8;
  --radius:16px;
  --font:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"Cascadia Code","SF Mono",Consolas,monospace;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  min-height:100vh;
  overflow-x:hidden;
}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{width:min(1120px,92vw);margin-inline:auto}

/* 背景网格 */
.bg-grid{
  position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%,rgba(0,102,255,.18),transparent 60%),
    radial-gradient(ellipse 50% 40% at 100% 50%,rgba(0,212,255,.08),transparent 50%),
    var(--bg);
}
.bg-grid::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(0,212,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse at center,black 20%,transparent 75%);
}

/* 导航 */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  background:rgba(6,11,20,.75);
  border-bottom:1px solid var(--border);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:16px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:1.05rem;color:var(--text)}
.brand img{width:40px;height:40px;border-radius:10px;object-fit:cover;border:1px solid var(--border)}
.nav-links{display:flex;gap:24px;list-style:none;font-size:.9rem}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--cyan);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid var(--border);color:var(--text);padding:8px 12px;border-radius:8px;cursor:pointer}

/* Hero */
.hero{padding:72px 0 56px;text-align:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;
  border:1px solid var(--border);background:var(--card);
  font-size:.78rem;color:var(--cyan);letter-spacing:.06em;text-transform:uppercase;
  margin-bottom:24px;
}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-bottom:16px}
.hero h1 span{background:linear-gradient(135deg,var(--cyan),var(--blue));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{max-width:560px;margin:0 auto 32px;color:var(--muted);font-size:1.05rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 24px;border-radius:12px;font-weight:600;font-size:.95rem;
  border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s;
}
.btn:hover{transform:translateY(-1px);text-decoration:none}
.btn-primary{background:linear-gradient(135deg,var(--blue),#0088cc);color:#fff;box-shadow:0 4px 24px rgba(0,102,255,.35)}
.btn-ghost{border-color:var(--border);color:var(--text);background:var(--card)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* 指标条 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:48px 0 0}
.stat{padding:20px;border-radius:var(--radius);background:var(--card);border:1px solid var(--border);text-align:center}
.stat strong{display:block;font-size:1.6rem;font-weight:800;color:var(--cyan);font-family:var(--mono)}
.stat span{font-size:.78rem;color:var(--muted);margin-top:4px;display:block}

/* Section */
section{padding:64px 0}
.section-head{text-align:center;margin-bottom:40px}
.section-head h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:520px;margin:0 auto;font-size:.95rem}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.card{
  padding:28px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--border);
  transition:border-color .2s,box-shadow .2s;
}
.card:hover{border-color:rgba(0,212,255,.35);box-shadow:0 8px 32px rgba(0,102,255,.12)}
.card-icon{
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(0,102,255,.2),rgba(0,212,255,.15));
  border:1px solid var(--border);margin-bottom:16px;font-size:1.2rem;
}
.card h3{font-size:1.05rem;margin-bottom:8px;font-weight:650}
.card p{font-size:.88rem;color:var(--muted);line-height:1.55}

/* 安全区 */
.security-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.security-list{list-style:none;display:flex;flex-direction:column;gap:14px}
.security-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:14px 16px;border-radius:12px;background:var(--card);border:1px solid var(--border);
  font-size:.9rem;color:var(--muted);
}
.security-list li::before{content:"✓";color:var(--cyan);font-weight:700;flex-shrink:0}
.code-panel{
  padding:24px;border-radius:var(--radius);
  background:#0a101c;border:1px solid var(--border);
  font-family:var(--mono);font-size:.78rem;line-height:1.7;color:#7dd3fc;
  overflow-x:auto;
}
.code-panel .comment{color:var(--muted)}

/* CTA */
.cta{
  margin:32px 0;padding:48px 32px;border-radius:20px;text-align:center;
  background:linear-gradient(135deg,rgba(0,102,255,.15),rgba(0,212,255,.08));
  border:1px solid var(--border);
}
.cta h2{margin-bottom:10px;font-size:1.5rem}
.cta p{color:var(--muted);margin-bottom:20px;font-size:.95rem}

/* Footer */
.footer{padding:32px 0;border-top:1px solid var(--border);text-align:center;font-size:.82rem;color:var(--muted)}
.footer strong{color:var(--text)}

@media(max-width:768px){
  .nav-links{display:none}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:rgba(6,11,20,.95);padding:16px 4vw;border-bottom:1px solid var(--border)}
  .nav-toggle{display:block}
  .stats{grid-template-columns:repeat(2,1fr)}
  .security-grid{grid-template-columns:1fr}
}