:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #262a36;
  --accent: #5b8cff;
  --text: #e6e8ee;
  --muted: #8b90a0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font: 16px/1.65 system-ui, -apple-system, sans-serif;
  background: var(--bg); color: var(--text);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* hero */
.hero {
  padding: 1.5rem clamp(1.25rem, 6vw, 6rem) 4rem;
  background: radial-gradient(1200px 400px at 70% -10%, rgba(91,140,255,.15), transparent);
}
nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: .5rem 0 3.5rem;
}
.brand {
  font-weight: 700; letter-spacing: .05em;
  border: 1px solid var(--border); border-radius: 8px; padding: .35rem .6rem;
}
.nav-links a { color: var(--muted); margin-left: 1.5rem; font-size: .9rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.hero-body { max-width: 720px; }
h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); line-height: 1.1; }
.tagline { color: var(--accent); font-size: 1.15rem; margin: .5rem 0 1.25rem; font-weight: 600; }
.intro { color: var(--muted); font-size: 1.05rem; max-width: 620px; }
.intro strong { color: var(--text); font-weight: 600; }
.hero-cta { margin-top: 2rem; display: flex; gap: .75rem; flex-wrap: wrap; }
.btn {
  padding: .7rem 1.25rem; border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); font-weight: 600; font-size: .95rem;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

/* sections */
main { max-width: 860px; margin: 0 auto; padding: 1rem clamp(1.25rem, 5vw, 2rem) 2rem; }
section { padding: 3rem 0; border-top: 1px solid var(--border); }
h2 { font-size: 1.5rem; margin-bottom: 1.5rem; }

/* project cards */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.5rem; margin-bottom: 1.25rem;
}
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.card h3 { font-size: 1.2rem; }
.card .links a { font-size: .85rem; margin-left: 1rem; white-space: nowrap; }
.card p { color: var(--muted); margin: .75rem 0 1rem; }
.card code { background: #0f1117; padding: .1rem .35rem; border-radius: 5px; font-size: .85em; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tags span {
  font-size: .72rem; color: var(--muted); background: #0f1117;
  border: 1px solid var(--border); border-radius: 6px; padding: .25rem .5rem;
}

/* skills */
.skill-groups { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.skill-groups h4 { color: var(--accent); font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: .4rem; }
.skill-groups p { color: var(--muted); font-size: .95rem; }

/* contact */
.contact-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.contact-links a { font-size: 1.05rem; font-weight: 600; }

footer { text-align: center; color: var(--muted); font-size: .82rem; padding: 2.5rem 1rem; border-top: 1px solid var(--border); }