:root {
  --bg: #0c1222;
  --surface: #151c2e;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --accent: #38bdf8;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  text-align: left;
}

.layout {
  max-width: 560px;
  margin: 0;
  padding: 3rem 1.5rem;
}

.header {
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

#status {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background: var(--accent);
  color: #0c1222;
}

.btn:hover {
  filter: brightness(1.08);
}