:root {
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --paper: #ffffff;
  --wash: #f8fafc;
  --accent: #0369a1;
  --mark: #38bdf8;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
    --paper: #0b1120;
    --wash: #0f172a;
    --accent: #7dd3fc;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 400 1.0625rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: 56rem; margin: 0 auto; padding: 0 1.5rem; }

header .wrap { display: flex; align-items: center; justify-content: space-between; padding-block: 1.5rem; }

.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.125rem; letter-spacing: -0.01em; }
.brand img { width: 2rem; height: 2rem; border-radius: 0.4rem; }

nav a { color: var(--muted); text-decoration: none; margin-left: 1.5rem; }
nav a:hover { color: var(--ink); }

.hero { padding-block: 5rem 4rem; }
.hero h1 { font-size: clamp(2.25rem, 6vw, 3.5rem); line-height: 1.1; letter-spacing: -0.03em; margin: 0 0 1.25rem; max-width: 18ch; }
.hero p { font-size: 1.25rem; color: var(--muted); margin: 0; max-width: 38rem; }

section { padding-block: 3.5rem; border-top: 1px solid var(--line); }
h2 { font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 1.5rem; }

.project { background: var(--wash); border: 1px solid var(--line); border-radius: 1rem; padding: 2rem; }
.project h3 { font-size: 1.5rem; margin: 0 0 0.25rem; letter-spacing: -0.02em; }
.project .tag { display: inline-block; font-size: 0.8125rem; font-weight: 600; color: var(--accent); margin-bottom: 1rem; }
.project p { margin: 0 0 1.25rem; max-width: 40rem; }
.project p:last-child { margin-bottom: 0; }

.button { display: inline-block; background: var(--ink); color: var(--paper); padding: 0.65rem 1.1rem; border-radius: 0.5rem; text-decoration: none; font-weight: 600; }
.button:hover { opacity: 0.9; }

.columns { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.columns h3 { font-size: 1.0625rem; margin: 0 0 0.4rem; }
.columns p { margin: 0; color: var(--muted); }

footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9375rem; }
footer .wrap { padding-block: 2rem; }

:focus-visible { outline: 3px solid var(--mark); outline-offset: 3px; border-radius: 4px; }