:root{
  --bg:#0b1220;
  --bg-soft:#0f172a;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --brand:#fbbf24;
  --brand-ink:#1f2937;
  --card:#111827;
  --card-border:#1f2937;
  --btn:#2563eb;
  --btn-text:#fff;
  --blur:12px;
  --radius:16px;
  --scale:1.04;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --transition:200ms ease;
}

html[data-theme="light"]{
  --bg:#fafafa;
  --bg-soft:#ffffffcc;
  --text:#111827;
  --muted:#6b7280;
  --brand:#f59e0b;
  --brand-ink:#111827;
  --card:#ffffffcc;
  --card-border:#e5e7eb;
  --btn:#2563eb;
  --btn-text:#fff;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:CustomFont,Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Noto Sans",sans-serif;
  background:var(--bg);
  color:var(--text);
  transition:background-color 300ms var(--transition), color 300ms var(--transition);
}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,0.1);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(255,255,255,0.2);z-index:10;box-shadow:0 8px 32px rgba(0,0,0,0.1)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800;letter-spacing:.5px}
.brand-logo{width:32px;height:32px;border-radius:8px;object-fit:contain}
.brand-cn{font-size:20px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

.main-nav{display:flex;gap:16px}
.nav-link{background:none;border:none;color:var(--text);opacity:.8;font-weight:600;padding:8px 10px;border-radius:8px;cursor:pointer}
.nav-link:hover,.nav-link.active{opacity:1;background:var(--bg-soft)}

.controls{display:flex;align-items:center;gap:12px}
.theme-toggle{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,0.1);color:var(--text);border:1px solid rgba(255,255,255,0.2);border-radius:999px;padding:6px 12px;cursor:pointer;backdrop-filter:blur(10px);transition:all var(--transition)}
.theme-toggle:active{transform:scale(.96)}
.external-link{display:flex;align-items:center;padding:6px;border-radius:999px;background:rgba(255,255,255,0.1);border:1px solid rgba(255,255,255,0.2);backdrop-filter:blur(10px);transition:all var(--transition)}
.external-link:hover{transform:scale(1.05);background:rgba(255,255,255,0.15)}
.link-icon{width:20px;height:20px;border-radius:4px}
.lang-select{background:rgba(255,255,255,0.1);color:var(--text);border:1px solid rgba(255,255,255,0.2);border-radius:999px;padding:6px 12px;backdrop-filter:blur(10px)}

/* Main */
.hero{display:flex;justify-content:center;align-items:center;height:100vh;padding:0;margin:0}
.hero-logo{width:100%;height:100%;object-fit:cover;object-position:center}

.section{padding:48px 24px}
.section-title{margin:10px 0 16px;font-size:22px}
.muted-text{color:var(--muted)}

/* Cards */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media (max-width:1200px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:800px){.card-grid{grid-template-columns:1fr}}
.card{border:1px solid rgba(255,255,255,0.2);background:rgba(255,255,255,0.1);backdrop-filter:blur(20px);border-radius:28px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 8px 32px rgba(0,0,0,0.1);transform:translateY(0) scale(1);transition:all 400ms cubic-bezier(0.4, 0, 0.2, 1);cursor:pointer;position:relative}
.card:hover{transform:translateY(-16px) scale(1.08);box-shadow:0 25px 50px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.3);backdrop-filter:blur(30px);background:rgba(255,255,255,0.2);border-color:rgba(255,255,255,0.4)}
.card:active{transform:translateY(-12px) scale(1.02);transition:all 150ms ease}
.card.clicked{transform:scale(0.92);transition:transform 100ms ease}
.card-logo{position:absolute;top:12px;left:12px;width:36px;height:36px;border-radius:8px;z-index:2;object-fit:contain;transition:all 300ms ease;filter:drop-shadow(0 2px 8px rgba(0,0,0,0.3))}
.card:hover .card-logo{transform:scale(1.1) rotate(5deg);filter:drop-shadow(0 4px 12px rgba(0,0,0,0.4))}
.card-media{background-size:cover;background-position:center;height:200px;transition:all 400ms ease;transform:scale(1)}
.card:hover .card-media{transform:scale(1.05);filter:brightness(1.1) contrast(1.1)}
.card-body{padding:24px}
.card-title{margin:6px 0 12px;font-size:18px;transition:all 300ms ease;transform:translateY(0)}
.card:hover .card-title{transform:translateY(-2px);color:var(--brand)}
.card-desc{margin:0 0 18px;color:var(--muted);line-height:1.5;transition:all 300ms ease;transform:translateY(0)}
.card:hover .card-desc{transform:translateY(-1px);color:var(--text)}
.card-btn{display:inline-block;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:var(--btn-text);text-decoration:none;padding:12px 20px;border-radius:12px;font-weight:600;font-size:16px;backdrop-filter:blur(10px);transition:all 300ms ease;box-shadow:0 4px 15px rgba(59,130,246,0.3);transform:translateY(0) scale(1)}
.card:hover .card-btn{transform:translateY(-4px) scale(1.05);box-shadow:0 12px 30px rgba(59,130,246,0.5);background:linear-gradient(135deg,#2563eb,#7c3aed)}
.card-btn:hover{filter:brightness(1.2);transform:translateY(-4px) scale(1.05);box-shadow:0 12px 30px rgba(59,130,246,0.5)}

/* Footer */
.site-footer{border-top:1px solid var(--card-border);padding:22px 0;color:var(--muted)}

/* Theme fade/flip animation */
html.theme-transition *{transition:background-color 300ms var(--transition), color 300ms var(--transition), border-color 300ms var(--transition), box-shadow 300ms var(--transition)}

/* Floating orbs background */
.orbs{position:fixed;inset:0;overflow:hidden;pointer-events:none;z-index:0}
.orbs span{position:absolute;width:280px;height:280px;border-radius:999px;filter:blur(80px);opacity:.18;background:radial-gradient(circle at 30% 30%, #fbbf24, transparent 60%)}
.orbs span:nth-child(1){top:-60px;left:-60px;animation:float 16s ease-in-out infinite}
.orbs span:nth-child(2){top:20%;right:-80px;background:radial-gradient(circle at 40% 40%, #60a5fa, transparent 60%);animation:float 18s ease-in-out infinite reverse}
.orbs span:nth-child(3){bottom:-80px;left:10%;background:radial-gradient(circle at 40% 40%, #34d399, transparent 60%);animation:float 22s ease-in-out infinite}
.orbs span:nth-child(4){bottom:10%;right:15%;background:radial-gradient(circle at 40% 40%, #f472b6, transparent 60%);animation:float 20s ease-in-out infinite reverse}
.orbs span:nth-child(5){top:35%;left:40%;background:radial-gradient(circle at 40% 40%, #c084fc, transparent 60%);animation:float 26s ease-in-out infinite}
.orbs span:nth-child(6){top:5%;right:40%;background:radial-gradient(circle at 40% 40%, #f59e0b, transparent 60%);animation:float 24s ease-in-out infinite reverse}

@keyframes float{0%{transform:translateY(0) translateX(0)}50%{transform:translateY(-30px) translateX(20px)}100%{transform:translateY(0) translateX(0)}}

/* Reveal on scroll */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity 500ms var(--transition), transform 500ms var(--transition)}
[data-reveal].reveal-in{opacity:1;transform:translateY(0)}

/* Initial overlay */
.initial-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg);display:flex;align-items:center;justify-content:center;z-index:9999;transition:opacity 1s ease}
.initial-overlay.fade-out{opacity:0;pointer-events:none}
.overlay-logo{width:180px;height:180px;border-radius:32px;object-fit:contain}