/* Base */
:root {
  --bg: #131e38; /* slate-900 */
  --surface: #111827; /* gray-900 */
  --text: #e5e7eb; /* gray-200 */
  --muted: #94a3b8; /* slate-400 */
  --accent: #7c3aed; /* violet-600 */
  --accent-2: #22d3ee; /* cyan-400 */
  --card: #0b1220;
  --border: #1f2937;

  --bg-grad-1: radial-gradient(1200px 800px at 80% -10%, rgba(124,58,237,.25), transparent 60%);
  --bg-grad-2: radial-gradient(1000px 600px at -10% 10%, rgba(34,211,238,.2), transparent 60%);
}

html[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --border: #e2e8f0;

  --bg-grad-1: radial-gradient(1200px 800px at 80% -10%, rgba(124,58,237,.12), transparent 60%);
  --bg-grad-2: radial-gradient(1000px 600px at -10% 10%, rgba(34,211,238,.10), transparent 60%);
}

* { box-sizing: border-box; }
html, body { height: 100%; min-height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg-grad-1),
              var(--bg-grad-2),
              var(--bg);
  background-repeat: no-repeat;
  min-height: 100vh;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

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

/* Header & Nav */
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(8px); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0;
}
.logo { font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; font-weight: 800; letter-spacing: -0.02em; line-height: 0.95; color: var(--text); font-size: 1.25rem; }
.theme-toggle {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.02);
  color: var(--text);
  padding: .25rem .45rem;
  border-radius: .45rem;
  font-size: .8rem;
  line-height: 1;
  height: 32px;
  font-weight: 600;
  position: relative;
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease, border-color .18s ease;
  box-shadow: 0 0 0 rgba(0,0,0,0);
}

html:not([data-theme="light"]) .theme-toggle {
  --toggle-glow: rgba(124,58,237,.80);
  --toggle-glow-soft: rgba(34,211,238,.30);
  box-shadow: 0 0 14px var(--toggle-glow), 0 0 36px var(--toggle-glow-soft);
}

html[data-theme="light"] .theme-toggle {
  --toggle-glow: rgba(64, 25, 255, 0.70);
  --toggle-glow-soft: rgba(59,130,246,.30);
  box-shadow: 0 0 14px var(--toggle-glow), 0 0 36px var(--toggle-glow-soft);
  background: rgba(15,23,42,.04);
}

.theme-toggle:hover {
  background: rgba(255,255,255,.06);
  transform: translateY(-1px);
  box-shadow: 0 0 20px var(--toggle-glow), 0 0 60px var(--toggle-glow-soft);
}

.theme-toggle:active { transform: translateY(0); }
.nav-list { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
.nav-list a { color: var(--muted); font-weight: 600; }
.nav-list a:hover { color: var(--text); }
.nav-list a { position: relative; }
.nav-list a::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -6px; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.nav-list a:hover::after, .nav-list a:focus-visible::after { transform: scaleX(1); }
.nav-toggle { display: none; background: transparent; border: 0px solid var(--border); color: var(--text); padding: .4rem .6rem; border-radius: .5rem; }

@media (max-width: 760px) {
  .nav-toggle { display: inline-block; font-size: 2.5rem; padding: .6rem .6rem; }
  .nav-list { position: absolute; right: 4%; top: 64px; background: rgba(17,24,39,.9); border: 1px solid var(--border); border-radius: .75rem; padding: 1rem; display: none; flex-direction: column; gap: .5rem; }
  .nav-list.open { display: flex; }
}

/* Hero */
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 3rem; align-items: center; padding: 6rem 0 4rem; }
.hero-content h1 { font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; font-weight: 800; letter-spacing: -0.02em; line-height: 0.95; }
.hero-content h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 .5rem; }
.accent { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: 1.125rem; }
.hero-media { height: 300px; border-radius: 1rem; border: 1px solid var(--border); overflow: hidden; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; display: block; }

@keyframes floatY {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}
.hero-media { animation: floatY 7s ease-in-out infinite alternate; }

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
}

/* Sections */
.section { padding: 2.5rem 0; }
.section h2 { font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; font-weight: 800; letter-spacing: -0.02em; line-height: 0.95; }
.section h2 { font-size: 1.75rem; margin: 0 0 1rem; }

#about p { font-family: 'Lexend', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; }

/* Buttons */
.btn { display: inline-block; padding: .7rem 1rem; border-radius: .6rem; border: 1px solid var(--border); color: var(--text); background: rgba(255,255,255,.02); font-weight: 600; }
.btn:hover { background: rgba(255,255,255,.06); transform: translateY(-1px); box-shadow: 0 10px 20px rgba(124,58,237,.12), 0 6px 12px rgba(34,211,238,.08); }
.btn.primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); border: none; color: #0b1020; }

.cta { display: flex; gap: .75rem; margin-top: 1rem; flex-wrap: wrap; }

/* Grid & Cards */
.grid { display: grid; gap: 1rem; }
.projects-grid { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
@media (max-width: 960px) { .projects-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .projects-grid { grid-template-columns: 1fr; } }

.projects-grid > .card { height: 100%; }

.projects-grid .extra-project { display: none; }
.projects-grid.is-expanded .extra-project { display: flex; }

.projects-footer { display: flex; justify-content: center; margin-top: 1rem; }
.projects-footer #projects-toggle { font-size: 1.05rem; padding: .85rem 1.25rem; }

.card { background: var(--card); border: 1px solid var(--border); padding: 1rem; border-radius: .9rem; transition: transform .5s cubic-bezier(.2,.8,.2,1), box-shadow .15s cubic-bezier(.2,.8,.2,1), border-color .15s ease; display: flex; flex-direction: column; will-change: transform; position: relative; z-index: 0; }
.card.is-open { z-index: 20; }
.card.is-placeholder { opacity: 0; pointer-events: none; }
.card.card-overlay { opacity: 1; pointer-events: auto; }
.card h3 { margin: 0 0 .25rem; }
.card p { font-family: 'Lexend', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; color: var(--muted); margin: 0 0 .75rem; }
.card-actions { display: flex; gap: .75rem; margin-top: auto; margin-bottom: .85rem; }
.card-actions a { font-family: 'Lexend', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; }
.link { color: var(--accent-2); }
.link:hover { text-decoration: underline; }

html[data-theme="light"] .card-actions .link { color: #1e40af; }
html[data-theme="light"] .card-actions .link:hover { color: #1d4ed8; }
.project-details { margin: 0 0 .75rem; }
.project-summary { font-family: 'Lexend', 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; cursor: pointer; color: var(--muted); font-weight: 400; list-style: none; }
.project-summary:hover { text-decoration: underline; }
.project-details summary { display: inline; }
.project-details > summary.project-summary .project-faded { opacity: .35; transition: opacity .2s ease; }
.project-details[open] > summary.project-summary .project-faded { opacity: 1; }
.project-details > summary.project-summary .project-rest { display: none; }
.project-details[open] > summary.project-summary .project-rest { display: inline; }
.project-details > p { display: none; }
.card.is-placeholder .project-details[open] > p { display: none; }
.project-details summary::marker { content: ""; }
.project-details summary::-webkit-details-marker { display: none; }
.project-media { margin-top: 0; border-radius: .75rem; border: 1px solid var(--border); background: rgba(255,255,255,.03); height: 180px; overflow: hidden; }
.project-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; border-radius: inherit; }

/* Reveal on scroll */
[data-animate] { opacity: 0; transform: translateY(14px); filter: saturate(.9); transition: opacity .6s ease, transform .6s ease, filter .6s ease; will-change: opacity, transform; }
[data-animate].visible { opacity: 1; transform: none; filter: saturate(1); transition-delay: var(--stagger, 0ms); }

.card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(12,19,31,.35); border-color: rgba(124,58,237,.45); }
.card.freeze-hover { transform: none; box-shadow: 0 16px 40px rgba(12,19,31,.35); border-color: rgba(124,58,237,.45); }
.card.freeze-hover:hover { transform: none; }
.card.is-open:hover,
.card.card-overlay:hover { transform: none; }

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto; }
  [data-animate] { opacity: 1 !important; transform: none !important; }
}

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2.5rem; margin-top: 1.5rem; }
.skills-group h3 { margin: 0 0 .85rem; font-size: 1.05rem; }
.skills-group ul { margin: 0; padding: 0; list-style: none; }
.skills-group li { color: var(--muted); margin: .35rem 0; }

@media (max-width: 960px) {
  .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
}

@media (max-width: 600px) {
  .skills-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 2rem; }
.foot { padding: 1.25rem 0; color: var(--muted); text-align: center; }

.resume-note { color: var(--muted); font-size: .95rem; margin-top: 1rem; }