: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: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);
  contain-intrinsic-size: 1000px auto;
}

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

/* Header */
/* Enhanced animations */
.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);animation:slideDown 0.6s ease-out}
@keyframes slideDown{0%{transform:translateY(-100%);opacity:0}100%{transform:translateY(0);opacity:1}}

.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800;letter-spacing:.5px;transition:all 300ms ease;animation:fadeInLeft 0.8s ease-out 0.2s both}
.brand:hover{transform:scale(1.05)}
@keyframes fadeInLeft{0%{opacity:0;transform:translateX(-30px)}100%{opacity:1;transform:translateX(0)}}

.controls{display:flex;align-items:center;gap:12px;animation:fadeInRight 0.8s ease-out 0.4s both}
@keyframes fadeInRight{0%{opacity:0;transform:translateX(30px)}100%{opacity:1;transform:translateX(0)}}

.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 300ms ease;animation:pulse 2s ease-in-out infinite}
.theme-toggle:hover{transform:scale(1.1) rotate(5deg);box-shadow:0 8px 25px rgba(0,0,0,0.2)}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(59,130,246,0.4)}50%{box-shadow:0 0 0 10px rgba(59,130,246,0)}}

.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 300ms ease;animation:bounce 1s ease-in-out infinite}
.external-link:hover{transform:scale(1.15) rotate(10deg);background:rgba(255,255,255,0.2);box-shadow:0 8px 25px rgba(0,0,0,0.2)}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}

.link-icon{width:20px;height:20px;border-radius:4px;transition:all 300ms ease}
.link-icon:hover{transform:scale(1.2) rotate(15deg)}

.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand-logo{width:32px;height:32px;border-radius:8px;object-fit:contain;transition:all 300ms ease;animation:rotateIn 1s ease-out 0.6s both}
.brand-logo:hover{transform:scale(1.1) rotate(10deg)}
@keyframes rotateIn{0%{opacity:0;transform:rotate(-180deg) scale(0.5)}100%{opacity:1;transform:rotate(0deg) scale(1)}}

.brand-cn{font-size:20px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:textShine 3s ease-in-out infinite}
@keyframes textShine{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

/* Main */
.hero{display:flex;justify-content:flex-start;align-items:center;height:80vh;padding:0;margin:0;position:relative;overflow:hidden}
.hero-content{max-width:1200px;margin:0 auto;padding:0 24px;width:100%;position:relative;z-index:2}
.slogan-text{font-size:clamp(32px,4.8vw,60px);line-height:1.25;font-weight:700;margin:0;color:var(--text);text-wrap:balance;animation:fadeInOpacity 0.6s ease-out;display:block}
.slogan-text .hi{background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:900;font-size:1.18em}
.hero-logo::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(45deg, rgba(59,130,246,0.1), rgba(139,92,246,0.1));opacity:0;transition:opacity 600ms ease;pointer-events:none}
.hero-logo:hover::before{opacity:1}
/* subtleZoom no longer used for image; keeping for potential reuse */
@keyframes subtleZoom{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}
@keyframes fadeInOpacity{0%{opacity:0}100%{opacity:1}}

.section{padding:48px 24px}
/* tighten projects spacing */
#projects.section{padding-top:16px}
.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;animation:staggerIn 0.8s ease-out 1s both}
@keyframes staggerIn{0%{opacity:0;transform:translateY(50px)}100%{opacity:1;transform:translateY(0)}}

.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:transform 400ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 400ms cubic-bezier(0.4, 0, 0.2, 1), background-color 400ms cubic-bezier(0.4, 0, 0.2, 1), border-color 400ms cubic-bezier(0.4, 0, 0.2, 1);cursor:pointer;position:relative;animation:cardFloat 6s ease-in-out infinite;will-change:transform}
.card:nth-child(1){animation-delay:0s}
.card:nth-child(2){animation-delay:1s}
.card:nth-child(3){animation-delay:2s}
.card:nth-child(4){animation-delay:3s}
.card:nth-child(5){animation-delay:4s}
.card:nth-child(6){animation-delay:5s}
@keyframes cardFloat{0%,100%{transform:translateY(0) rotate(0deg)}25%{transform:translateY(-5px) rotate(0.5deg)}50%{transform:translateY(-10px) rotate(0deg)}75%{transform:translateY(-5px) rotate(-0.5deg)}}
.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 4px 12px rgba(0,0,0,0.6)) drop-shadow(0 2px 4px rgba(0,0,0,0.4));background:rgba(255,255,255,0.9);padding:4px;border:2px solid rgba(255,255,255,0.8)}
.card:hover .card-logo{transform:scale(1.1) rotate(5deg);filter:drop-shadow(0 6px 16px rgba(0,0,0,0.7)) drop-shadow(0 3px 6px rgba(0,0,0,0.5));background:rgba(255,255,255,1)}
@media (max-width:1200px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:800px){.card-grid{grid-template-columns:1fr}}

.card-media{background-size:cover;background-position:center;height:240px;aspect-ratio:16/9;transition:transform 400ms ease, filter 400ms ease;transform:scale(1);animation:imagePulse 4s ease-in-out infinite;will-change:transform,filter;content-visibility:auto}
.card:hover .card-media{transform:scale(1.05);filter:brightness(1.1) contrast(1.1)}
@keyframes imagePulse{0%,100%{filter:brightness(1) contrast(1)}50%{filter:brightness(1.05) contrast(1.05)}}

.card-body{padding:24px;animation:slideUp 0.6s ease-out 1.2s both}
@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}100%{opacity:1;transform:translateY(0)}}

.card-title{margin:6px 0 12px;font-size:18px;transition:transform 300ms ease, color 300ms ease;transform:translateY(0);animation:textGlow 3s ease-in-out infinite}
.card:hover .card-title{transform:translateY(-2px);color:var(--brand)}
@keyframes textGlow{0%,100%{text-shadow:0 0 5px rgba(59,130,246,0.3)}50%{text-shadow:0 0 15px rgba(59,130,246,0.6)}}

.card-desc{margin:0 0 18px;color:var(--muted);line-height:1.5;transition:transform 300ms ease, color 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:transform 300ms ease, box-shadow 300ms ease, filter 300ms ease, background 300ms ease;box-shadow:0 4px 15px rgba(59,130,246,0.3);transform:translateY(0) scale(1);animation:buttonPulse 2s ease-in-out infinite;will-change:transform}
.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)}
@keyframes buttonPulse{0%,100%{box-shadow:0 4px 15px rgba(59,130,246,0.3)}50%{box-shadow:0 4px 25px rgba(59,130,246,0.5)}}

/* Footer */
.site-footer{border-top:1px solid var(--card-border);padding:22px 0;color:var(--muted);animation:fadeInUp 0.8s ease-out 1.5s both}
@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}100%{opacity:1;transform:translateY(0)}}

/* 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:1}
.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%);will-change:transform}
.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}

/* Light mode orb colors */
html[data-theme="light"] .orbs span{opacity:.12}
html[data-theme="light"] .orbs span:nth-child(1){background:radial-gradient(circle at 30% 30%, #fbbf24, transparent 60%)}
html[data-theme="light"] .orbs span:nth-child(2){background:radial-gradient(circle at 40% 40%, #3b82f6, transparent 60%)}
html[data-theme="light"] .orbs span:nth-child(3){background:radial-gradient(circle at 40% 40%, #10b981, transparent 60%)}
html[data-theme="light"] .orbs span:nth-child(4){background:radial-gradient(circle at 40% 40%, #ec4899, transparent 60%)}
html[data-theme="light"] .orbs span:nth-child(5){background:radial-gradient(circle at 40% 40%, #8b5cf6, transparent 60%)}
html[data-theme="light"] .orbs span:nth-child(6){background:radial-gradient(circle at 40% 40%, #f59e0b, transparent 60%)}

@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:240px;height:240px;border-radius:40px;object-fit:contain;filter:drop-shadow(0 0 30px rgba(59,130,246,0.6)) drop-shadow(0 0 60px rgba(139,92,246,0.4)) drop-shadow(0 0 90px rgba(59,130,246,0.3));animation:glow 2s ease-in-out infinite alternate}
@keyframes glow{0%{filter:drop-shadow(0 0 20px rgba(59,130,246,0.4)) drop-shadow(0 0 40px rgba(139,92,246,0.3)) drop-shadow(0 0 60px rgba(59,130,246,0.2))}100%{filter:drop-shadow(0 0 30px rgba(59,130,246,0.8)) drop-shadow(0 0 60px rgba(139,92,246,0.6)) drop-shadow(0 0 90px rgba(59,130,246,0.4))}}

/* Scroll hint */
.scroll-hint{position:fixed;left:0;right:0;bottom:22px;display:flex;gap:8px;align-items:center;justify-content:center;pointer-events:none;z-index:9;opacity:0.85;transform:translateY(12px);transition:opacity 400ms var(--transition), transform 400ms var(--transition)}
.scroll-hint.show{opacity:.9;transform:translateY(0)}
.scroll-hint .arrow{font-size:20px;animation:hintFloat 1.6s ease-in-out infinite}
.scroll-hint .hint-text{color:var(--muted);font-size:14px;background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.18);backdrop-filter:blur(8px);border-radius:999px;padding:6px 10px}
@keyframes hintFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}

/* hero container positioning retained for safety */
.hero{position:relative}

/* Mobile adaptations */
@media (max-width:600px){
  .hero{height:68vh}
  .hero-content{padding:0 16px}
  .slogan-text{font-size:clamp(24px,7vw,40px);line-height:1.3}
  .slogan-text .hi{font-size:1.12em}
  .card-grid{gap:14px}
  .card-media{height:180px}
  .card-body{padding:18px}
  .scroll-hint{bottom:14px}
  .scroll-hint .arrow{font-size:18px}
  .scroll-hint .hint-text{font-size:12px;padding:5px 9px}
}