:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --primary: #0f172a;
  --primary-hover: #1e293b;
  --error: #b91c1c;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.brand {
  text-align: center;
  margin-bottom: 24px;
}

.brand h1 {
  margin: 0;
  font-size: 1.75rem;
  letter-spacing: -0.01em;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  max-width: 360px;
  width: 100%;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

label {
  display: block;
  margin-bottom: 12px;
  font-size: .9rem;
  color: var(--muted);
}

label span {
  display: block;
  margin-bottom: 6px;
}

input[type=text], input[type=password] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--text);
  background: #fff;
  font-family: inherit;
}

input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

button {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 10px 16px;
  background: var(--primary);
  color: #fff;
  border: 0;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  font-family: inherit;
}

button:disabled { opacity: .6; cursor: progress; }
button:hover:not(:disabled) { background: var(--primary-hover); }

.error {
  color: var(--error);
  font-size: .85rem;
  min-height: 1.2em;
  margin-top: 8px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  margin: 0;
  font-size: 1.1rem;
}

.topbar button {
  width: auto;
  margin: 0;
  padding: 6px 12px;
  font-size: .85rem;
}

main.card {
  margin: 24px auto;
  max-width: 480px;
}

.user-info {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
  margin: 12px 0 0;
}

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

.user-info dd {
  margin: 0;
}