:root {
  /* Dark mode (default) */
  --bg: #0a0a0a;
  --panel: #111111;
  --card: #1a1a1a;
  --text: #ffffff;
  --muted: #a0a0a0;
  --brand: #6366f1;
  --brand-2: #8b5cf6;
  --accent: #06b6d4;
  --border: rgba(255,255,255,0.1);
  --shadow: 0 10px 30px rgba(0,0,0,0.4), 0 6px 12px rgba(0,0,0,0.3);
  --shadow-hover: 0 20px 40px rgba(0,0,0,0.5), 0 12px 24px rgba(0,0,0,0.4);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --panel: #ffffff;
    --card: #ffffff;
    --text: #0f0f0f;
    --muted: #6b7280;
    --brand: #6366f1;
    --brand-2: #8b5cf6;
    --accent: #06b6d4;
    --border: rgba(0,0,0,0.1);
    --shadow: 0 8px 24px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.08);
    --shadow-hover: 0 16px 32px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.12);
  }
}

/* Theme override via data-theme */
[data-theme="light"] {
  --bg: #fafafa;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #0f0f0f;
  --muted: #6b7280;
  --brand: #6366f1;
  --brand-2: #8b5cf6;
  --accent: #06b6d4;
  --border: rgba(0,0,0,0.1);
  --shadow: 0 8px 24px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 16px 32px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, rgba(99,102,241,0.08), transparent 40%),
              radial-gradient(1000px 500px at 110% 20%, rgba(139,92,246,0.08), transparent 40%),
              var(--bg);
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.bg { position: fixed; inset: 0; pointer-events: none; z-index: -1; }
.bg-blob { position: absolute; filter: blur(60px); opacity: .25; }
.bg-blob.one { width: 420px; height: 420px; left: -80px; top: -60px; background: radial-gradient(circle, #6366f1, transparent 60%); animation: drift-left 18s ease-in-out infinite alternate; }
.bg-blob.two { width: 520px; height: 520px; right: -120px; top: 120px; background: radial-gradient(circle, #8b5cf6, transparent 60%); animation: drift-right 22s ease-in-out infinite alternate; }
.bg-grid { position: absolute; inset: 0; background-image: linear-gradient(transparent 23px, var(--border) 24px), linear-gradient(90deg, transparent 23px, var(--border) 24px); background-size: 24px 24px; mask-image: radial-gradient(60% 50% at 50% 40%, #000 40%, transparent 70%); opacity: .4; }

@keyframes drift-left { 0% { transform: translate(0,0) scale(1); } 100% { transform: translate(40px, 20px) scale(1.06); } }
@keyframes drift-right { 0% { transform: translate(0,0) scale(1); } 100% { transform: translate(-30px, -10px) scale(1.05); } }

.container { width: min(1100px, 92%); margin: 0 auto; }

.site-header { 
  position: sticky; 
  top: 0; 
  z-index: 50; 
  backdrop-filter: saturate(1.2) blur(12px); 
  background: color-mix(in oklab, var(--bg) 85%, transparent); 
  border-bottom: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.brand { 
  font-weight: 800; 
  letter-spacing: 0.5px; 
  color: var(--text); 
  text-decoration: none; 
  background: linear-gradient(90deg, var(--brand), var(--brand-2)); 
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent; 
  font-size: 22px;
  transition: transform 0.2s ease;
}
.brand:hover { transform: scale(1.05); }
.nav { display: flex; gap: 24px; align-items: center; }
.nav a { 
  color: var(--muted); 
  text-decoration: none; 
  font-weight: 500; 
  transition: all 0.2s ease;
  padding: 6px 12px;
  border-radius: 8px;
}
.nav a:hover { 
  color: var(--text); 
  background: color-mix(in oklab, var(--panel) 60%, transparent);
  transform: translateY(-1px);
}
.nav .cta { 
  color: var(--text); 
  padding: 8px 16px; 
  border-radius: 12px; 
  border: 1px solid var(--border); 
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: var(--shadow);
  transition: all 0.2s ease;
  font-weight: 600;
}
.nav .cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}
.icon-btn { 
  border: 1px solid var(--border); 
  background: color-mix(in oklab, var(--panel) 90%, transparent); 
  color: var(--text); 
  padding: 8px; 
  border-radius: 12px; 
  display: inline-grid; 
  place-items: center; 
  cursor: pointer; 
  transition: all 0.3s ease;
  min-width: 40px;
  min-height: 40px;
  backdrop-filter: blur(8px);
}

.icon-btn:hover {
  background: color-mix(in oklab, var(--panel) 95%, transparent);
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.icon-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow);
}
.icon { display: block; }
.moon-icon, .sun-icon { 
  transition: opacity 0.2s ease; 
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Ensure icons are visible in both themes */
.icon-btn .icon {
  color: var(--text);
}

.hero { 
  display: grid; 
  grid-template-columns: 1fr; 
  gap: 40px; 
  padding: 80px 0 40px; 
  align-items: center; 
}
.hero .greet { 
  display: block; 
  color: var(--muted); 
  font-weight: 600; 
  letter-spacing: .4px;
  font-size: 18px;
}
.hero .name { 
  font-size: clamp(42px, 7vw, 64px); 
  font-weight: 800; 
  letter-spacing: -0.02em; 
  background: linear-gradient(135deg, var(--brand), var(--brand-2), var(--accent)); 
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
  margin: 8px 0;
}
.subtitle { 
  color: var(--muted); 
  font-size: 20px; 
  margin-top: 16px;
  line-height: 1.6;
}
.hero-actions { display: flex; gap: 16px; margin-top: 32px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.btn { 
  display: inline-flex; 
  align-items: center; 
  gap: 12px; 
  padding: 14px 20px; 
  border-radius: 14px; 
  text-decoration: none; 
  border: 1px solid var(--border); 
  font-weight: 600; 
  color: var(--text); 
  background: color-mix(in oklab, var(--panel) 90%, transparent); 
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  font-size: 16px;
}
.btn.primary { 
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); 
  border: 1px solid var(--brand);
  box-shadow: var(--shadow);
}
.btn.primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-2);
}
.btn.ghost { 
  background: transparent;
  border-color: var(--border);
}
.btn.ghost:hover {
  background: color-mix(in oklab, var(--panel) 60%, transparent);
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.stat { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 12px; text-align: center; }
.stat .kpi { font-size: 22px; font-weight: 800; }
.stat .label { color: var(--muted); font-size: 12px; }

.section { padding: 44px 0 14px; }
.section h2 { font-size: 26px; margin-bottom: 14px; }

.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.skill-card { 
  background: var(--card); 
  border: 1px solid var(--border); 
  border-radius: 16px; 
  padding: 20px; 
  box-shadow: var(--shadow); 
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}
.skill-card:hover { 
  transform: translateY(-4px); 
  border-color: var(--brand); 
  box-shadow: var(--shadow-hover);
  background: color-mix(in oklab, var(--card) 95%, transparent);
}
.skill-card h3 { margin: 0 0 8px; font-size: 16px; }
.skill-list { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { 
  border: 1px solid var(--border); 
  background: color-mix(in oklab, var(--panel) 90%, transparent); 
  color: var(--text); 
  padding: 8px 12px; 
  border-radius: 999px; 
  font-size: 13px; 
  text-decoration: none; 
  display: inline-flex; 
  align-items: center;
  transition: all 0.2s ease;
  font-weight: 500;
}
.chip:hover {
  background: color-mix(in oklab, var(--panel) 95%, transparent);
  border-color: var(--brand);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.timeline { 
  position: relative; 
  margin-left: 10px; 
  padding-left: 18px; 
  display: grid; 
  gap: 20px; 
}
.timeline:before { 
  content: ""; 
  position: absolute; 
  left: 0; 
  top: 0; 
  bottom: 0; 
  width: 3px; 
  background: linear-gradient(var(--brand), var(--brand-2), var(--accent)); 
  opacity: 0.8; 
  border-radius: 3px; 
}
.item { 
  position: relative; 
  background: linear-gradient(180deg, color-mix(in oklab, var(--panel) 90%, transparent), color-mix(in oklab, var(--panel) 96%, transparent)); 
  border: 1px solid var(--border); 
  border-radius: 18px; 
  padding: 20px; 
  box-shadow: var(--shadow); 
  overflow: hidden; 
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}
.item:before { 
  content: ""; 
  position: absolute; 
  left: -22px; 
  top: 24px; 
  width: 14px; 
  height: 14px; 
  border-radius: 50%; 
  background: var(--card); 
  border: 3px solid var(--brand); 
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--brand) 20%, transparent); 
  animation: pulse 2.4s ease-in-out infinite; 
}
.item .top { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
.item .role { font-weight: 800; letter-spacing: .2px; font-size: 18px; }
.item .org { color: var(--muted); font-weight: 600; }
.item .date { color: var(--muted); font-size: 13px; }
.item ul { margin: 12px 0 0 20px; color: var(--muted); line-height: 1.6; }
.item .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.item:hover { 
  transform: translateY(-4px); 
  border-color: var(--brand); 
  box-shadow: var(--shadow-hover);
  background: color-mix(in oklab, var(--panel) 95%, transparent);
}

@keyframes pulse { 0% { box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand) 16%, transparent); } 50% { box-shadow: 0 0 0 6px color-mix(in oklab, var(--brand) 6%, transparent); } 100% { box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand) 16%, transparent); } }

.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.project { 
  border: 1px solid var(--border); 
  background: var(--card); 
  border-radius: 18px; 
  padding: 20px; 
  position: relative; 
  overflow: hidden; 
  box-shadow: var(--shadow); 
  cursor: pointer; 
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}
.project:hover { 
  transform: translateY(-5px); 
  border-color: var(--brand); 
  box-shadow: var(--shadow-hover);
  background: color-mix(in oklab, var(--card) 95%, transparent);
}
.project::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(600px 60px at var(--mx, 50%) var(--my, 0%), color-mix(in oklab, var(--brand-2) 22%, transparent), transparent 40%); opacity: 0; transition: opacity .25s ease; }
.project:hover::after { opacity: 1; }
.project-header { 
  display: flex; 
  justify-content: space-between; 
  align-items: flex-start; 
  gap: 12px; 
  margin-bottom: 6px; 
}
.project h3 { 
  margin: 0; 
  font-size: 18px; 
  flex: 1; 
  line-height: 1.3; 
}
.github-link { 
  display: inline-flex; 
  align-items: center; 
  gap: 6px; 
  padding: 6px 10px; 
  border: 1px solid var(--border); 
  background: color-mix(in oklab, var(--panel) 90%, transparent); 
  color: var(--text); 
  text-decoration: none; 
  border-radius: 8px; 
  font-size: 13px; 
  font-weight: 500; 
  transition: all 0.2s ease; 
  flex-shrink: 0; 
  white-space: nowrap;
}
.github-link:hover { 
  background: color-mix(in oklab, var(--panel) 95%, transparent); 
  border-color: var(--brand); 
  transform: translateY(-1px); 
  box-shadow: var(--shadow); 
  color: var(--brand);
}
.github-link svg { 
  flex-shrink: 0; 
}
.project p { margin: 0 0 8px; color: var(--muted); }
.project .tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project .details { max-height: 0; overflow: hidden; opacity: 0; transform: translateY(4px); transition: max-height .35s ease, opacity .25s ease, transform .25s ease; }
.project.open .details { max-height: 420px; opacity: 1; transform: translateY(0); margin-top: 8px; }

.contact-card { 
  border: 1px solid var(--border); 
  background: var(--card); 
  border-radius: 18px; 
  padding: 24px; 
  box-shadow: var(--shadow); 
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}
.contact-card:hover { 
  transform: translateY(-3px); 
  border-color: var(--brand);
  box-shadow: var(--shadow-hover);
}
.contact-row { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: 16px; }
.contact-actions { display: flex; gap: 12px; margin-top: 20px; }

.site-footer { margin: 60px 0; }
.site-footer .container { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 14px; }
.site-footer .top { 
  border: 1px solid var(--border); 
  background: color-mix(in oklab, var(--panel) 90%, transparent); 
  color: var(--text); 
  padding: 8px 12px; 
  border-radius: 12px; 
  text-decoration: none;
  transition: all 0.2s ease;
}
.site-footer .top:hover {
  background: var(--panel);
  border-color: var(--brand);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .projects-grid, .skills-grid { grid-template-columns: 1fr; }
  .project-header { 
    flex-direction: column; 
    align-items: flex-start; 
    gap: 8px; 
  }
  .github-link { 
    align-self: flex-start; 
  }
}

/* Initial loading animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Initial animation classes */
.animate-on-load {
  opacity: 0;
  animation-fill-mode: both;
}

.animate-on-load.fade-in-up {
  animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.animate-on-load.fade-in-scale {
  animation: fadeInScale 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.animate-on-load.slide-in-left {
  animation: slideInLeft 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.animate-on-load.slide-in-right {
  animation: slideInRight 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

/* Animation delays for sequential entrance */
.animate-on-load.delay-100 { animation-delay: 0.1s; }
.animate-on-load.delay-200 { animation-delay: 0.2s; }
.animate-on-load.delay-300 { animation-delay: 0.3s; }
.animate-on-load.delay-400 { animation-delay: 0.4s; }
.animate-on-load.delay-500 { animation-delay: 0.5s; }
.animate-on-load.delay-600 { animation-delay: 0.6s; }
.animate-on-load.delay-700 { animation-delay: 0.7s; }
.animate-on-load.delay-800 { animation-delay: 0.8s; }

/* Reveal on scroll */
.reveal { opacity: 0; translate: 0 10px; transition: opacity .5s ease, translate .5s ease; }
.reveal.visible { opacity: 1; translate: 0 0; }

/* Smooth theme transitions */
* {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* Enhanced focus states for accessibility */
.btn:focus, .nav a:focus, .icon-btn:focus {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Improved section spacing */
.section { padding: 60px 0 20px; }
.section h2 { 
  font-size: 28px; 
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}