:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --green: #3fb950;
  --red: #f85149;
  --radius: 12px;
  --font: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0;
}

main {
  flex: 1;
}

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

.card h2 {
  font-size: 1.125rem;
  margin: 0 0 1rem 0;
  font-weight: 600;
}

.card.error {
  border-color: rgba(248, 81, 73, 0.3);
  color: var(--red);
}

.hidden {
  display: none !important;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid rgba(139, 148, 158, 0.3);
  margin-top: 1rem;
}

.btn-secondary:hover {
  color: var(--text);
  border-color: var(--muted);
}

.user-info {
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.user-info dl {
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.user-info dt {
  color: var(--muted);
  font-weight: 400;
}

.user-info dd {
  margin: 0;
  word-break: break-all;
}

footer {
  margin-top: auto;
  padding-top: 2rem;
  font-size: 0.75rem;
  color: var(--muted);
}

footer p {
  margin: 0;
}