:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1a1f2b;
  --muted: #5b6474;
  --line: #e2e7f0;
  --accent: #1f5fd6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --card: #181c24;
    --text: #e8ebf1;
    --muted: #9aa3b2;
    --line: #2a303b;
    --accent: #6ea8ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

header img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  flex-shrink: 0;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.2;
}

header p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

nav {
  display: flex;
  gap: 20px;
  margin: 20px 0 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}

nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

a { color: var(--accent); }

h2 {
  margin: 36px 0 10px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

h3 {
  margin: 24px 0 6px;
  font-size: 1.05rem;
}

p { margin: 0 0 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
}

.card p:last-child { margin-bottom: 0; }

.muted { color: var(--muted); }

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}