:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --text-color: #0f172a;
  --text-muted: #475569;
  --error-color: #ef4444;
  --border-color: #e2e8f0;
  --card-shadow: 0 18px 40px -22px rgba(15, 23, 42, 0.35);
  --transition: all 0.3s ease;
  --radius: 14px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.12), transparent 30%),
              radial-gradient(circle at 80% 0%, rgba(14, 165, 233, 0.16), transparent 28%),
              linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  color: var(--text-color);
}

.auth-container {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  width: 100%;
  max-width: 420px;
  overflow: hidden;
  transition: var(--transition);
  animation: fadeIn 0.6s ease forwards;
  border: 1px solid rgba(226, 232, 240, 0.7);
}

.auth-header {
  background: var(--surface);
  padding: 2.25rem 2rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.auth-header h2 {
  color: var(--text-color);
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

.auth-header p {
  color: var(--text-muted);
  margin-top: 0.45rem;
  font-size: 0.95rem;
}

.auth-header img {
  height: 42px;
  margin-bottom: 1rem;
}

.auth-body {
  padding: 2.25rem;
  background: var(--surface-muted);
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.divider::before {
  margin-right: 0.5rem;
}

.divider::after {
  margin-left: 0.5rem;
}

.google-button {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  width: 100%;
  max-width: 300px;
  margin: 1.6rem auto 1.25rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: -0.01em;
  box-shadow: 0 12px 30px -20px rgba(37, 99, 235, 0.45);
}

.google-button:hover {
  box-shadow: 0 14px 30px -18px rgba(37, 99, 235, 0.35);
  transform: translateY(-2px);
  border-color: rgba(37, 99, 235, 0.35);
}

.google-auth-container {
  text-align: center;
  padding: 1rem 0;
}

.auth-info {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
  font-size: 0.98rem;
  line-height: 1.55;
}

.benefits {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 2rem 0;
  text-align: left;
  padding: 0 1.5rem;
}

.benefit-item {
  color: var(--text-color);
  font-size: 0.9rem;
  font-weight: 600;
}

.privacy-note {
  color: var(--text-muted);
  font-size: 0.86rem;
  margin-top: 1.4rem;
}

.google-button img {
  margin-right: 0.8rem;
  width: 1.2rem;
  height: 1.2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background-color: #ffffff;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.95rem;
  transition: var(--transition);
  color: var(--text-color);
}

.form-control:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.55);
  box-shadow: 0 10px 30px -24px rgba(37, 99, 235, 0.6), 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn {
  display: block;
  width: 100%;
  padding: 0.9rem 1rem;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.97rem;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: -0.01em;
  box-shadow: 0 14px 34px -18px rgba(37, 99, 235, 0.55);
}

.btn:hover {
  background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 100%);
  transform: translateY(-1px);
}

.error-message {
  color: var(--error-color);
  margin-bottom: 1rem;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 0.75rem;
  background-color: rgba(239, 68, 68, 0.08);
  border-radius: 10px;
  display: none;
}

.auth-footer {
  text-align: center;
  padding: 0 2rem 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  background: var(--surface);
}

.auth-footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.auth-footer a:hover {
  text-decoration: underline;
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

.form-check {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

.form-check input {
  margin-right: 0.5rem;
}

.form-check label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 480px) {
  .auth-container {
    max-width: 100%;
  }
  .auth-header {
    padding: 1.6rem 1.1rem 1.2rem;
  }
  .auth-header h2 {
    font-size: 1.6rem;
  }
  .auth-body {
    padding: 1.6rem;
  }
  .auth-footer {
    padding: 0 1.5rem 1.5rem;
  }
  .form-row {
    flex-direction: column;
    gap: 0;
  }
}