:root {
  --brand-color: #4285f4;
  --brand-color-hover: #357ae8;
  --text-color: #333;
  --text-color-light: #666;
  --border-color: #ccc;
  --error-color: #c62828;
  --success-color: #2e7d32;
  --bg-color: #f7f7f7;
  --surface-color: #fff;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  background: var(--bg-color);
  display: grid;
  place-content: center;
  min-height: 100vh;
  padding: 1rem;
  box-sizing: border-box;
}

.container {
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  text-align: center;
  background: var(--surface-color);
  padding: 2.5rem 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

h1 {
  margin-top: 0;
  color: var(--text-color);
}

p {
  color: var(--text-color-light);
}

.form-group {
  margin-bottom: 1.25rem;
  text-align: left;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
}

input[type="email"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-sizing: border-box;
  transition: border-color 0.2s;
}

input:focus {
  border-color: var(--brand-color);
  outline: none;
  box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

.btn {
  width: 100%;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.btn:disabled {
  background: #9bbcff;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--brand-color);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--brand-color-hover);
}

.btn-secondary {
  background: var(--surface-color);
  color: var(--text-color);
  border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: #f2f2f2;
}

.separator {
  font-size: 0.8rem;
  color: #999;
  margin: 1.5rem 0;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.separator::before,
.separator::after {
  content: "";
  height: 1px;
  background: #e0e0e0;
  flex-grow: 1;
}

.feedback {
  margin-top: 1rem;
  font-weight: 500;
}

.error {
  color: var(--error-color);
}

.success {
  color: var(--success-color);
}

.subtle-link {
  color: var(--brand-color);
  text-decoration: none;
  cursor: pointer;
  font-size: 0.9rem;
}

.subtle-link:hover {
  text-decoration: underline;
}

.hidden {
  display: none;
}