:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #e5e8ed;
  --text: #16202b;
  --muted: #5c6b7a;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --radius: 14px;
  --maxw: 880px;
  --shadow: 0 1px 2px rgba(16, 32, 43, 0.04), 0 8px 24px rgba(16, 32, 43, 0.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #242b34;
    --text: #e8edf2;
    --muted: #9aa7b4;
    --accent: #58a6ff;
    --accent-soft: #15233b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 18px; padding-bottom: 18px;
}
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; text-decoration: none; color: var(--text); }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
nav a:hover { color: var(--text); }

.hero { padding: 72px 0 40px; }
.hero h1 { font-size: 2.4rem; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
.hero p.lead { font-size: 1.2rem; color: var(--muted); margin: 0 0 28px; max-width: 620px; }

section { padding: 36px 0; }
h2 { font-size: 1.4rem; letter-spacing: -0.01em; margin: 0 0 20px; }
h3 { margin: 0 0 6px; font-size: 1.15rem; }
p { margin: 0 0 16px; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } .hero h1 { font-size: 1.9rem; } }

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}
a.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card .tag { display: inline-block; font-size: 0.78rem; color: var(--accent); background: var(--accent-soft); padding: 2px 10px; border-radius: 999px; margin-bottom: 10px; }
.card p { color: var(--muted); margin: 0; }

.btn {
  display: inline-block; background: var(--accent); color: #fff; text-decoration: none;
  padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 0.98rem;
}
.btn:hover { filter: brightness(1.05); }
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border); }

.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
a { color: var(--accent); }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.9rem;
}
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer.site a { color: var(--muted); text-decoration: none; margin-left: 16px; }
footer.site a:hover { color: var(--text); }
footer.site .links { display: flex; flex-wrap: wrap; }

/* article / legal pages */
article.doc h1 { font-size: 1.9rem; margin: 48px 0 8px; }
article.doc { padding-bottom: 20px; }
article.doc h2 { font-size: 1.25rem; margin-top: 32px; }
article.doc ul { padding-left: 20px; }
article.doc li { margin-bottom: 8px; }
.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 24px; }