:root {
  --bg: #fbfaf7;
  --fg: #1f2a2e;
  --muted: #5d6b70;
  --accent: #2f7d6d;
  --accent-fg: #fff;
  --card: #fff;
  --line: #e4e1da;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14191b;
    --fg: #e8ecec;
    --muted: #9aa8ab;
    --accent: #4fb39f;
    --accent-fg: #0c1514;
    --card: #1c2325;
    --line: #2b3538;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

header.site {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
header.site .container {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px 24px; padding-top: 14px; padding-bottom: 14px;
}
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--accent); }

.hero { padding: 72px 0 56px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.15; margin: 0 0 16px; }
.hero p { font-size: 1.15rem; color: var(--muted); max-width: 40em; }

.btn {
  display: inline-block; padding: 12px 24px; border-radius: 8px;
  background: var(--accent); color: var(--accent-fg);
  text-decoration: none; font-weight: 600;
}
.btn:hover { opacity: .9; }

section { padding: 48px 0; border-top: 1px solid var(--line); }
section h2 { margin: 0 0 20px; font-size: 1.7rem; }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); }

.about { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .about { grid-template-columns: 220px 1fr; } }
.portrait {
  width: 220px; height: 220px; border-radius: 50%;
  object-fit: cover; object-position: 50% 35%;
}

dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 8px 24px; }
dt { font-weight: 600; }
dd { margin: 0; color: var(--muted); }

footer { padding: 32px 0; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); }

.notfound { padding: 120px 20px; text-align: center; }