:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #1d4ed8;
  --accent-text: #ffffff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --surface: #131a26;
    --text: #e5e9f0;
    --muted: #9aa6b8;
    --border: #243045;
    --accent: #6d9bff;
    --accent-text: #0b0f17;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; z-index: 10; background: var(--bg); padding: 8px 12px; }

.nav {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.nav nav { display: flex; gap: 20px; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav nav a:hover { color: var(--text); }
@media (max-width: 560px) { .nav nav { gap: 14px; } .nav nav a { font-size: 14px; } .brand { font-size: 15px; } }

.hero { padding-top: 88px; padding-bottom: 56px; }
.eyebrow { color: var(--accent); font-weight: 600; margin: 0 0 12px; }
h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 18ch; }
.lede { font-size: 19px; color: var(--muted); max-width: 62ch; margin: 0 0 28px; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px;
  border: 1px solid var(--border); color: var(--text); text-decoration: none; font-weight: 600;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.ghost { border-color: transparent; color: var(--muted); }
.btn.ghost:hover { color: var(--text); }

.facts { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.facts li { border-top: 2px solid var(--border); padding-top: 12px; }
.facts strong { display: block; font-size: 22px; }
.facts span { color: var(--muted); font-size: 15px; }
@media (max-width: 640px) { .facts { grid-template-columns: 1fr; } }

.section { padding-top: 64px; padding-bottom: 24px; }
h2 { font-size: 28px; letter-spacing: -0.01em; margin: 0 0 8px; }
.section-intro { color: var(--muted); margin: 0 0 28px; }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 820px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 24px; display: flex; flex-direction: column;
}
.card h3 { font-size: 22px; margin: 0; }
.tag { font-size: 13px; color: var(--muted); margin: 0 0 6px; text-transform: uppercase; letter-spacing: 0.04em; }
.sub { color: var(--muted); margin: 2px 0 12px; }
.card ul { padding-left: 18px; margin: 4px 0 16px; }
.card li { margin-bottom: 6px; }
.stack { font-size: 14px; color: var(--muted); margin: auto 0 12px; padding-top: 8px; border-top: 1px dashed var(--border); }
.link { font-weight: 600; text-decoration: none; }
.link::after { content: " \2192"; }

.timeline { list-style: none; padding: 0; margin: 24px 0 0; }
.timeline li { display: grid; grid-template-columns: 160px 1fr; gap: 24px; padding: 20px 0; border-top: 1px solid var(--border); }
.timeline h3 { margin: 0; font-size: 19px; }
.timeline p { margin: 0 0 6px; }
.when { color: var(--muted); font-size: 15px; padding-top: 2px; }
@media (max-width: 640px) { .timeline li { grid-template-columns: 1fr; gap: 4px; } }

.skills { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 32px; margin: 24px 0 0; }
.skills dt { font-weight: 700; }
.skills dd { margin: 2px 0 0; color: var(--muted); }
@media (max-width: 640px) { .skills { grid-template-columns: 1fr; } }

.contact p { font-size: 18px; color: var(--muted); max-width: 60ch; }
.footer { padding-top: 48px; padding-bottom: 40px; color: var(--muted); font-size: 14px; }
@media (max-width: 420px) { .nav nav a[href="#skills"] { display: none; } }