:root {
  --bg: #0b0f14;
  --surface: #121821;
  --border: #1f2833;
  --text: #e6edf3;
  --muted: #8b98a8;
  --accent: #38e0b0;
  --accent-ink: #04201a;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem clamp(1.25rem, 5vw, 4rem);
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { font-family: var(--mono); font-weight: 700; letter-spacing: -0.02em; }
.brand span { color: var(--accent); }
.nav nav { display: flex; gap: 1.5rem; }
.nav nav a { color: var(--muted); font-size: 0.92rem; transition: color 0.15s; }
.nav nav a:hover { color: var(--text); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #5cf0c4; }
.btn-small { padding: 0.45rem 0.9rem; font-size: 0.85rem; }

/* Layout */
main, .footer { max-width: 1040px; margin: 0 auto; padding: 0 clamp(1.25rem, 5vw, 2rem); }
.section { padding: 4.5rem 0 0; }
h1, h2, h3 { line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 1.8rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.1rem; margin-bottom: 0.6rem; }
.eyebrow {
  margin: 0 0 1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.lead { color: var(--muted); font-size: 1.15rem; max-width: 60ch; }
.lead strong { color: var(--text); }
.cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.75rem; }

/* Hero */
.hero { padding-top: clamp(4rem, 10vw, 7rem); }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.8rem); margin-bottom: 1.25rem; }
.hero em { font-style: normal; color: var(--accent); }
.terminal {
  margin: 3rem 0 0;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.8;
  overflow-x: auto;
}
.terminal .dim { color: var(--accent); }
.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--accent);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* About */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; color: var(--muted); }
.two-col p { margin: 0; }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.grid.skills { grid-template-columns: repeat(6, 1fr); }
.grid.skills .card { grid-column: span 2; }
.grid.skills .card:nth-child(n+4) { grid-column: span 3; }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card {
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.15s;
}
.card:hover { border-color: #2c3a49; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.num { display: block; margin-bottom: 0.8rem; font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }
.tags li {
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

/* Knowledge */
.knowledge-inner {
  padding: clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(600px 240px at 90% 0%, rgba(56, 224, 176, 0.14), transparent 70%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}
.knowledge h2 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
.knowledge .lead { margin: 1rem 0 1.75rem; }

/* Footer */
.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 5rem;
  padding-top: 1.5rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
}
.footer a:hover { color: var(--accent); }

@media (max-width: 720px) {
  .nav nav { display: none; }
  .two-col { grid-template-columns: 1fr; }
  .grid.skills { grid-template-columns: 1fr; }
  .grid.skills .card, .grid.skills .card:nth-child(n+4) { grid-column: auto; }
  .footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
  .btn { transition: none; }
}