:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --bg-color: #f3f4f6;
  --card-bg: #ffffff;
  --text-color: #1f2937;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  --error-bg: #fee2e2;
  --error-text: #991b1b;
  --success-bg: #dcfce7;
  --success-text: #166534;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.auth-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.auth-card {
  background: var(--card-bg);
  padding: 32px 24px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.tab-box {
  display: flex;
  background: #f8fafc;
  padding: 4px;
  border-radius: 8px;
  margin-bottom: 24px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--card-bg);
  color: var(--primary-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-form h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.input-group input {
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.input-group input:focus {
  border-color: var(--primary-color);
}

.btn {
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: var(--primary-color);
  color: #ffffff;
  margin-top: 8px;
}

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

.btn-secondary {
  background: #ef4444;
  color: white;
  margin-top: 16px;
}

.btn-secondary:hover {
  background: #dc2626;
}

.divider {
  display: flex;
  align-items: center;
  margin: 20px 0;
  color: var(--text-muted);
  font-size: 12px;
}

.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.divider span {
  padding: 0 10px;
}

.btn-google {
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-color);
}

.btn-google:hover {
  background: #f9fafb;
}

.google-icon {
  width: 18px;
  height: 18px;
}

.alert {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  margin-bottom: 16px;
}

.alert.error {
  background: var(--error-bg);
  color: var(--error-text);
}

.alert.success {
  background: var(--success-bg);
  color: var(--success-text);
}

.user-dashboard {
  text-align: center;
}

.user-dashboard h2 {
  margin-bottom: 8px;
}

.hidden {
  display: none !important;
}