@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

/* THEME */
:root {
  --bg: #0b1220;
  --bg-soft: #0f172a;
  --text: #e6edf6;
  --muted: #a7b3c9;
  --accent: #5caaff;
  --accent-2: #a78bfa;
  --card: rgba(255,255,255,0.04);
  --card-bd: rgba(255,255,255,0.08);
  --ring: 0 0 0 3px rgba(92,170,255,0.35);
  --shadow: 0 12px 34px rgba(0,0,0,0.45);
  --radius: 18px;
}
:root[data-theme="light"] {
  --bg: #f7fafc;
  --bg-soft: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --card: rgba(255,255,255,0.86);
  --card-bd: rgba(2,6,23,0.08);
  --shadow: 0 12px 34px rgba(2,6,23,0.08);
}

/* BASE */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.6 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background:
    radial-gradient(700px 350px at 0% 0%, rgba(92,170,255,0.16), transparent 60%),
    radial-gradient(700px 350px at 100% 100%, rgba(167,139,250,0.18), transparent 60%),
    var(--bg);
  color: var(--text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1,h2,h3 { line-height: 1.2; margin: 0 0 .75rem; }
h1 { font-size: clamp(2rem, 1.2rem + 2.8vw, 3.3rem); letter-spacing: .2px; }
h2 { font-size: clamp(1.4rem, 1rem + 1.4vw, 2rem); }
h3 { font-size: clamp(1.05rem, .9rem + .6vw, 1.25rem); }
p { margin: 0 0 1rem; color: var(--muted); }
a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

/* ACCESSIBILITY */
.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus { position: static; padding: .5rem; background: var(--accent); color: #0b122a; border-radius: 8px; }

/* HEADER */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(8px);
  background: color-mix(in oklab, var(--bg-soft), transparent 18%);
  border-bottom: 1px solid var(--card-bd);
}
.navbar {
  max-width: 1100px; margin: 0 auto; padding: 0.9rem 1.2rem;
  display: grid; grid-template-columns: 1fr auto auto; gap: 1rem; align-items: center;
}
.logo { font-weight: 800; font-size: 1.25rem; color: var(--text); letter-spacing: .2px; }
.icon-btn {
  appearance: none; border: 1px solid var(--card-bd); background: var(--card);
  border-radius: 999px; padding: .5rem .7rem; color: var(--text); cursor: pointer;
}
.icon-btn:focus-visible { outline: none; box-shadow: var(--ring); }
.nav-links { list-style: none; display: flex; gap: 1.2rem; padding: 0; margin: 0; }
.nav-links a { color: var(--text); padding: .4rem .6rem; border-radius: 10px; }
.nav-links a:hover, .nav-links a:focus-visible { background: color-mix(in oklab, var(--accent) 18%, transparent); text-decoration: none; }

/* HERO */
.hero {
  position: relative; isolation: isolate;
  max-width: 1100px; margin: 2.6rem auto; padding: 2.2rem 1.2rem;
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 2rem; align-items: center;
}
.lead { font-size: clamp(1rem, .95rem + .4vw, 1.15rem); }
.hero-art { min-height: 300px; filter: drop-shadow(var(--shadow)); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  border: 1px solid var(--card-bd); background: var(--card); color: var(--text);
  padding: .6rem .9rem; border-radius: 12px; text-decoration: none; font-weight: 600;
  transition: transform .15s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-color: transparent; color: #0b1220; }

/* SECTIONS */
.section { max-width: 1100px; margin: 3rem auto; padding: 0 1.2rem; }
.unis { margin-top: 2rem; display: flex; gap: 2rem; align-items: center; flex-wrap: wrap; }
.uni-logo {
  height: 54px; width: auto; background: #fff; border-radius: 10px; padding: 7px 14px;
  box-shadow: 0 2px 12px rgba(23,50,77,0.08);
  filter: grayscale(12%) contrast(1.02) brightness(.98);
  transition: transform .2s ease, filter .2s ease, box-shadow .2s ease;
}
.uni-logo:hover, .uni-logo:focus { filter: none; transform: translateY(-2px) scale(1.03); }

/* PROJECTS */
.filters { display: flex; gap: .5rem; margin: .6rem 0 1.2rem; }
.chip {
  border: 1px solid var(--card-bd); background: var(--card); color: var(--text);
  padding: .35rem .7rem; border-radius: 999px; cursor: pointer; font-weight: 600;
}
.chip.is-active, .chip:hover { background: color-mix(in oklab, var(--accent) 16%, transparent); }

.projects-list {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem;
}
.project-card {
  position: relative; background: var(--card); border: 1px solid var(--card-bd);
  border-radius: 16px; padding: 1.2rem 1.1rem; box-shadow: var(--shadow); outline: none;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.project-card:hover, .project-card:focus-within { transform: translateY(-3px); }
.project-kicker {
  position: absolute; inset: 0 auto auto 0; width: 6px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-top-left-radius: 16px; border-bottom-left-radius: 16px;
}
.project-title { margin-left: .5rem; color: var(--text); }
.project-actions { display: flex; gap: .6rem; margin-top: .7rem; }
.btn.small { padding: .45rem .7rem; font-size: .92rem; border-radius: 10px; }
.btn.outline { background: transparent; }

/* CONTACT + FOOTER */
.section.contact a { font-weight: 600; }
.site-footer {
  border-top: 1px solid var(--card-bd);
  margin-top: 4rem; padding: 1.4rem 1.2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: color-mix(in oklab, var(--bg-soft), transparent 10%);
}

/* REVEAL ANIMATIONS */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
.fade-in { opacity: 0; transform: translateY(18px); animation: fadeUp .8s ease forwards .05s; }
@keyframes fadeUp { to { opacity: 1; transform: none; } }

/* SCROLLBAR */
::-webkit-scrollbar { width: 10px; background: color-mix(in oklab, var(--bg), #fff 6%); }
::-webkit-scrollbar-thumb { background: color-mix(in oklab, var(--accent) 50%, #000 10%); border-radius: 8px; }

/* RESPONSIVE */
@media (max-width: 1000px) {
  .hero { grid-template-columns: 1fr; }
  .projects-list { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .navbar { grid-template-columns: auto auto 1fr; }
  .nav-links { display: none; }
}

/* REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}