:root {
  color-scheme: light dark;
  --text: #202124;
  --muted: #555a64;
  --bg: #f7f7f8;
  --surface: #ffffff;
  --border: #dadce0;
  --primary: #f48120;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f4f5f7;
    --muted: #b8bdc7;
    --bg: #0b0c0f;
    --surface: #15171b;
    --border: #343941;
    --primary: #ff922b;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, sans-serif;
}

main {
  max-width: 440px;
  margin: 0 auto;
  padding: 48px 24px;
}

h1 {
  font-size: 28px;
  letter-spacing: -0.4px;
  margin: 0 0 12px;
}

p { margin: 0 0 16px; color: var(--muted); }

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

.mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--primary);
  margin-bottom: 20px;
}