/* Eduard Portfolio — OLED + Liquid Glass + motion (CSS/IO, no CDN anim libs) */
:root {
  --bg: #05060a;
  --bg-2: #0a0d14;
  --card: rgba(16, 22, 36, 0.55);
  --card-solid: #101624;
  --fg: #f4f7fb;
  --muted: #8b9bb4;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.14);
  --accent: #22c55e;
  --accent-2: #4ade80;
  --blue: #60a5fa;
  --violet: #a78bfa;
  --cyan: #22d3ee;
  --font-h: "Space Grotesk", system-ui, sans-serif;
  --font-b: "DM Sans", system-ui, sans-serif;
  --r: 22px;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header: 68px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; filter: none !important; transition: none !important; }
  .bg-orb { animation: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-b);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

.bg-grid {
  position: fixed; inset: 0; pointer-events: none; z-index: -2;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 20%, transparent 75%);
}
.bg-orb {
  position: fixed; border-radius: 50%; pointer-events: none; z-index: -1;
  filter: blur(80px); opacity: 0.45;
  animation: drift 18s var(--ease) infinite alternate;
}
.bg-orb-a {
  width: 520px; height: 520px; top: -120px; left: -80px;
  background: radial-gradient(circle, rgba(34,197,94,0.35), transparent 65%);
}
.bg-orb-b {
  width: 480px; height: 480px; top: 20%; right: -120px;
  background: radial-gradient(circle, rgba(96,165,250,0.28), transparent 65%);
  animation-delay: -6s;
}
.bg-orb-c {
  width: 360px; height: 360px; bottom: 5%; left: 35%;
  background: radial-gradient(circle, rgba(167,139,250,0.22), transparent 70%);
  animation-delay: -11s; opacity: 0.35;
}
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(40px, 30px) scale(1.08); }
}

#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -3;
  pointer-events: none;
  opacity: 0.85;
}

.site-header {
  position: sticky; top: 0; z-index: 40;
  height: var(--header);
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0 clamp(1rem, 4vw, 2rem);
  background: rgba(5, 6, 10, 0.72);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .25s;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(5, 6, 10, 0.88);
}
.logo {
  font-family: var(--font-h); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.03em;
}
.logo .logodot { color: var(--accent); margin-left: .1rem; }
.logofull { font-size: 1.15rem; }
.logodot { font-size: 1.25rem; }
@media (max-width: 560px) {
  .logofull { display: inline-block; } /* full always on mobile for clarity */
}
.nav { display: none; gap: 1.25rem; color: var(--muted); font-size: 0.95rem; }
.nav a { transition: color .2s; }
.nav a:hover { color: var(--fg); }
@media (min-width: 720px) { .nav { display: flex; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .4rem; border-radius: 999px; padding: .75rem 1.2rem;
  border: 1px solid var(--line-2); font-weight: 600; font-size: .95rem;
  transition: transform .2s var(--ease), background .2s, border-color .2s, box-shadow .2s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: .5rem .9rem; font-size: .85rem; }
.btn-accent {
  background: linear-gradient(135deg, #16a34a, #22c55e 50%, #4ade80);
  color: #04120a; border-color: transparent;
  box-shadow: 0 10px 30px rgba(34, 197, 94, 0.25);
}
.btn-accent:hover { box-shadow: 0 14px 36px rgba(34, 197, 94, 0.35); }
.btn-ghost {
  background: rgba(255,255,255,0.03);
  color: var(--fg);
}
.btn-ghost:hover { border-color: rgba(96,165,250,.45); background: rgba(96,165,250,.08); }

.hero {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2.5rem, 8vw, 5.5rem) 0 3rem;
}
.hero-badge {
  display: inline-flex; padding: .35rem .75rem; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255,255,255,0.03);
  color: var(--muted); font-size: .85rem; margin-bottom: 1.25rem;
}
.hero h1 {
  font-family: var(--font-h);
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.08; letter-spacing: -0.035em;
  margin: 0 0 1rem; font-weight: 700;
}
.grad {
  background: linear-gradient(105deg, var(--accent-2), var(--cyan) 45%, var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead {
  max-width: 36rem; color: var(--muted); font-size: 1.08rem; margin: 0 0 1.5rem;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1rem; }

.section {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3.5rem;
}
.section-head { margin-bottom: 1.5rem; max-width: 40rem; }
.section-head h2, .about h2, .contact h2 {
  font-family: var(--font-h); letter-spacing: -0.03em;
  font-size: clamp(1.6rem, 3vw, 2.2rem); margin: .25rem 0 .5rem;
}
.section-head p, .about p { color: var(--muted); margin: 0; }
.kicker {
  text-transform: uppercase; letter-spacing: .12em; font-size: .75rem;
  color: var(--accent-2); font-weight: 600; margin: 0 0 .35rem;
}

.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.25rem; }
.chip {
  border-radius: 999px; border: 1px solid var(--line); background: transparent;
  color: var(--muted); padding: .4rem .85rem; font-size: .85rem;
  transition: .2s var(--ease);
}
.chip:hover { color: var(--fg); border-color: var(--line-2); }
.chip.is-on {
  color: #04120a; background: var(--accent); border-color: transparent; font-weight: 600;
}

.project-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .project-grid { grid-template-columns: 1fr 1fr; }
}

.project-card {
  position: relative; overflow: hidden;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(18px) saturate(1.15);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  padding: 1.35rem 1.35rem 1.25rem;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.35);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
.project-card.is-hidden { display: none; }
.card-glow {
  position: absolute; inset: -40% auto auto -20%; width: 60%; height: 60%;
  background: radial-gradient(circle, rgba(34,197,94,0.18), transparent 70%);
  pointer-events: none; opacity: .7;
}
.project-card:nth-child(2) .card-glow { background: radial-gradient(circle, rgba(96,165,250,0.2), transparent 70%); }
.project-card:nth-child(3) .card-glow { background: radial-gradient(circle, rgba(167,139,250,0.2), transparent 70%); }
.project-card:nth-child(4) .card-glow { background: radial-gradient(circle, rgba(34,211,238,0.18), transparent 70%); }

.card-top {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: .75rem; position: relative;
}
.tag {
  font-size: .78rem; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: .2rem .55rem;
}
.num {
  font-family: var(--font-h); color: rgba(255,255,255,0.18); font-weight: 700; font-size: 1.1rem;
}
.project-card h3 {
  font-family: var(--font-h); font-size: 1.35rem; margin: 0 0 .35rem;
  letter-spacing: -0.02em; position: relative;
}
.card-sub { color: var(--blue); font-size: .95rem; margin: 0 0 .75rem; position: relative; }
.card-body { color: var(--muted); margin: 0 0 1rem; font-size: .95rem; position: relative; }
.feat {
  margin: 0 0 1.15rem; padding: 0; list-style: none; position: relative;
}
.feat li {
  position: relative; padding: .28rem 0 .28rem 1.1rem; color: var(--fg); font-size: .92rem;
}
.feat li::before {
  content: ""; position: absolute; left: 0; top: .7rem;
  width: .45rem; height: .45rem; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px rgba(34,197,94,.5);
}
.card-links { display: flex; flex-wrap: wrap; gap: .5rem; position: relative; }

.about-grid {
  display: grid; gap: 1.25rem;
}
@media (min-width: 800px) {
  .about-grid { grid-template-columns: 1.2fr 1fr; align-items: start; }
}
.about-list {
  margin: 1rem 0 0; padding-left: 1.1rem; color: var(--muted);
}
.about-list li { margin: .4rem 0; }
.glass-panel {
  border-radius: var(--r); border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(34,197,94,0.08), rgba(16,22,36,0.7));
  backdrop-filter: blur(16px);
  padding: 1.35rem 1.4rem;
}
.glass-panel h3 {
  font-family: var(--font-h); font-size: 1rem; margin: 0 0 .35rem;
}
.glass-panel h3:not(:first-child) { margin-top: 1rem; }
.glass-panel p { color: var(--muted); margin: 0; font-size: .95rem; }

.contact-card {
  border-radius: calc(var(--r) + 4px);
  border: 1px solid var(--line-2);
  background:
    radial-gradient(600px 200px at 10% 0%, rgba(34,197,94,0.15), transparent 55%),
    radial-gradient(500px 220px at 90% 100%, rgba(96,165,250,0.12), transparent 50%),
    var(--card);
  backdrop-filter: blur(18px);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  text-align: center;
}
.contact-card p { color: var(--muted); max-width: 32rem; margin: 0 auto 1.25rem; }
.contact-row { display: flex; flex-wrap: wrap; gap: .65rem; justify-content: center; }

.site-footer {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
  display: flex; justify-content: space-between; gap: 1rem;
  color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line);
}
.site-footer a:hover { color: var(--fg); }

/* reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  filter: blur(4px);
  transition: opacity .7s var(--ease), transform .7s var(--ease), filter .7s var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
  filter: none;
}
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* magnetic tilt light */
.project-card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%), rgba(255,255,255,0.07), transparent 40%);
  opacity: 0; transition: opacity .3s;
}
.project-card:hover::after { opacity: 1; }