:root {
  --bg: #f4f7fb;
  --text: #1d2939;
  --card: #ffffff;
  --accent: #2563eb;
  --border: #d1d5db;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #e0efff 0%, var(--bg) 45%);
  color: var(--text);
}

.page-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px;
}

h1 {
  font-size: clamp(2rem, 3vw, 3rem);
  margin-bottom: 0.5rem;
}

p {
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

button {
  appearance: none;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

button:hover,
button:focus-visible {
  transform: translateY(-1px);
  background: #1d4ed8;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
}

.card h2 {
  margin-top: 0;
}

.dark {
  --bg: #0f172a;
  --text: #e2e8f0;
  --card: #111827;
  --accent: #60a5fa;
  --border: #334155;
}

.dark body {
  background: radial-gradient(circle at top, #171f3d 0%, #0b1122 45%);
}