:root {
  color-scheme: light dark;
  --bg: #0b1220;
  --card: #101a2f;
  --text: #e8eefc;
  --muted: rgba(232, 238, 252, 0.75);
  --border: rgba(232, 238, 252, 0.14);
  --accent: #7aa2ff;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8ff;
    --card: #ffffff;
    --text: #0b1220;
    --muted: rgba(11, 18, 32, 0.7);
    --border: rgba(11, 18, 32, 0.12);
    --accent: #2f5cff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 0%, rgba(122, 162, 255, 0.18), transparent 55%),
              radial-gradient(1000px 500px at 80% 20%, rgba(122, 162, 255, 0.10), transparent 60%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 18px;
}

.header h1 {
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0 0 26px;
  color: var(--muted);
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 16px;
  padding: 18px 18px 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.20);
}

.card h2 { margin: 0 0 10px; }

ul { margin: 0 0 14px; padding-left: 18px; }
li { margin: 6px 0; color: var(--muted); }
.label { color: var(--text); }

.btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
}
.btn:hover { border-color: rgba(122, 162, 255, 0.45); }

.msg {
  margin: 10px 0 0;
  color: var(--muted);
  min-height: 1.2em;
}

.footer {
  margin-top: 18px;
  color: var(--muted);
}