:root {
  --bg: #fafaf9;
  --surface: #ffffff;
  --text: #1c1917;
  --muted: #57534e;
  --border: #e7e5e4;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
  --radius: 14px;
  --max: 920px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --surface: #1c1917;
    --text: #f5f5f4;
    --muted: #a8a29e;
    --border: #292524;
    --accent: #2dd4bf;
    --accent-soft: #134e4a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
header.site {
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 16px;
}
.brand { font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
nav a { color: var(--muted); margin-left: 20px; font-size: 15px; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

/* Hero */
.hero { padding: 72px 0 40px; }
.hero h1 {
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1.1; letter-spacing: -0.03em; margin: 0 0 16px;
}
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.tag {
  display: inline-block; font-size: 13px; font-weight: 600;
  background: var(--accent-soft); color: var(--accent);
  padding: 4px 10px; border-radius: 999px; margin-bottom: 18px;
}
.buttons { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px;
  border: 1px solid var(--border); color: var(--text); background: var(--surface);
  font-weight: 600; font-size: 15px;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn:hover { text-decoration: none; opacity: .9; }

/* Sections */
section { padding: 36px 0; }
section h2 { font-size: 22px; letter-spacing: -0.01em; margin: 0 0 18px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.card .links { margin-top: 12px; display: flex; gap: 14px; font-size: 14px; font-weight: 600; }

ul.timeline { list-style: none; padding: 0; margin: 0; }
ul.timeline li { padding: 14px 0; border-bottom: 1px solid var(--border); }
ul.timeline li:last-child { border-bottom: 0; }
ul.timeline strong { display: block; }
ul.timeline span { color: var(--muted); font-size: 15px; }

/* Footer */
footer.site { border-top: 1px solid var(--border); margin-top: 48px; padding: 28px 0; color: var(--muted); font-size: 14px; }
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 560px) {
  nav a { margin-left: 14px; }
  .hero { padding-top: 48px; }
}