:root {
  --bg: #0A0E1A;
  --bg-card: #11172A;
  --border: #1F2937;
  --text: #E4E4E7;
  --muted: #71717A;
  --accent: #22D3EE;
  --grid: #1A2030;
  --gradient: linear-gradient(135deg, #22D3EE 0%, #6366F1 100%);

  --mx: 50%;
  --my: 50%;
  --parallax-hero: 0px;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* === Top nav === */
.topnav {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 32px;
  z-index: 10;
  background: linear-gradient(180deg, rgba(10,14,26,0.8) 0%, rgba(10,14,26,0) 100%);
  backdrop-filter: blur(6px);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px; font-weight: 500;
}
.brand-logo {
  width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--gradient);
  color: #0A0E1A;
  display: flex; align-items: center; justify-content: center;
  font-weight: 500;
}
.brand-id { color: var(--muted); }
.topnav-links { display: flex; gap: 24px; font-family: var(--font-mono); font-size: 13px; }
.topnav-links a {
  position: relative;
  color: var(--text);
  transition: color .2s ease;
}
.topnav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -4px;
  width: 0; height: 1px; background: var(--accent);
  transition: width .25s ease;
}
.topnav-links a:hover { color: var(--accent); }
.topnav-links a:hover::after { width: 100%; }

/* === Sections common === */
main { display: block; }
.section {
  min-height: 100vh;
  padding: 120px 32px 80px;
  max-width: 1120px;
  margin: 0 auto;
}
.section-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 24px;
}

/* === Hero === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 32px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(600px circle at var(--mx) var(--my), rgba(34,211,238,0.15), transparent 60%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100% 100%, 32px 32px, 32px 32px;
  background-position: 0 0, 0 0, 0 0;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  width: 100%;
  transform: translateY(var(--parallax-hero));
}
.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 88px);
  font-weight: 500;
  line-height: 1.1;
  margin: 0;
  letter-spacing: -0.03em;
}
.hero-rule {
  width: 80px; height: 2px;
  background: var(--gradient);
  margin: 32px 0 24px;
}
.hero-sub {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.15em;
  margin: 0;
}
.scroll-hint {
  position: absolute;
  bottom: 32px;
  right: 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.2em;
  animation: bob 2s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translateY(0); opacity: .6; }
  50%      { transform: translateY(6px); opacity: 1; }
}

/* === About === */
.about-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}
.about-logo {
  width: 200px; height: 200px;
  border-radius: 16px;
  background: var(--gradient);
  color: #0A0E1A;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 120px;
  display: flex; align-items: center; justify-content: center;
}
.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  margin: 0 0 16px;
}

/* === Stack === */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.stack-card {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 16px;
  text-align: center;
  position: relative;
  will-change: transform;
  transform-style: preserve-3d;
  transition: border-color .25s ease;
}

/* === Contact === */
.contact-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 0 0 48px;
}
.contact-list li {
  display: flex; align-items: center; gap: 16px;
  font-family: var(--font-mono);
  font-size: 16px;
}
.contact-list .lbl {
  width: 80px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.contact-list .arrow {
  color: var(--accent);
  transition: transform .25s ease;
}
.contact-list a {
  color: var(--text);
  transition: color .2s ease;
}
.contact-list li:hover .arrow { transform: translateX(8px); }
.contact-list li:hover a { color: var(--accent); }

.contact-rule {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 0 0 24px;
}
.site-footer {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.site-footer a:hover { color: var(--accent); }

/* === Reveal on scroll === */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Type-on for section titles */
.section-title { clip-path: inset(0 100% 0 0); }
.section-title.is-visible {
  animation: typeon 600ms steps(8, end) forwards;
}
@keyframes typeon {
  from { clip-path: inset(0 100% 0 0); }
  to   { clip-path: inset(0 0 0 0); }
}

/* === Stack card 3D tilt === */
.stack-grid {
  perspective: 800px;
}
.stack-card {
  transition: transform .15s ease, border-color .25s ease, box-shadow .25s ease;
}
.stack-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 12px;
  padding: 1px;
  background: var(--gradient);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity .25s ease;
  pointer-events: none;
}
.stack-card:hover::before { opacity: 1; }
.stack-card:hover {
  box-shadow: 0 12px 32px rgba(34,211,238,0.12);
}

/* === Responsive (< 768px) === */
@media (max-width: 768px) {
  .topnav { padding: 16px 20px; }
  .topnav-links { display: none; }

  .section { padding: 96px 20px 64px; }

  .hero { padding: 0 20px; }
  .hero-title { font-size: clamp(32px, 8vw, 56px); }
  .scroll-hint { right: 20px; bottom: 24px; font-size: 11px; }

  .about-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .about-logo {
    width: 120px; height: 120px;
    font-size: 72px;
    margin: 0 auto;
  }

  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .stack-card { padding: 22px 12px; font-size: 14px; }

  .contact-list .lbl { width: 60px; font-size: 11px; }
  .contact-list li { font-size: 14px; flex-wrap: wrap; }
}

/* === Reduced motion === */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal.is-visible { transition: none; transform: none; opacity: 1; }
  .section-title { clip-path: none; animation: none; }
  .scroll-hint { animation: none; }
  .stack-card, .stack-card:hover { transform: none !important; }
}