:root {
  color-scheme: light dark;
  --bg: #f7f7f8;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #d9d9df;
  --accent: #2a5bd7;
  --error: #b3261e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: white;
}

.brand {
  font-weight: 600;
  text-decoration: none;
  color: var(--fg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  color: var(--accent);
  text-decoration: none;
}

.nav-user {
  color: var(--muted);
  font-size: 0.9rem;
}

.inline-form {
  display: inline;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
}

.container {
  max-width: 480px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.form input {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

.form button {
  margin-top: 0.5rem;
  padding: 0.65rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  cursor: pointer;
}

.error {
  color: var(--error);
  background: #fbeceb;
  border: 1px solid #f2c4c1;
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
}