:root {
  --primary-color: #2c5282;
  --secondary-color: #1a365d;
  --accent-color: #3182ce;
  --light-bg: #f7fafc;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-container {
  max-width: 450px;
  width: 100%;
}

.auth-card {
  background: white;
  border-radius: 15px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

.auth-header {
  background: linear-gradient(
    135deg,
    var(--secondary-color) 0%,
    var(--primary-color) 100%
  );
  color: white;
  padding: 2.5rem 2rem;
  text-align: center;
}

.auth-header h2 {
  margin: 0;
  font-size: 1.8rem;
  font-weight: bold;
}

.auth-header p {
  margin: 0.5rem 0 0 0;
  opacity: 0.9;
  font-size: 0.95rem;
}

.brand-logo {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.auth-body {
  padding: 2.5rem 2rem;
}

.form-label {
  font-weight: 600;
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

.form-control {
  padding: 0.75rem 1rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  transition: all 0.3s;
}

.form-control:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 0.2rem rgba(49, 130, 206, 0.15);
}

.input-group-text {
  background-color: var(--light-bg);
  border: 2px solid #e2e8f0;
  border-right: none;
  border-radius: 8px 0 0 8px;
}

.input-group .form-control {
  border-left: none;
  border-radius: 0 8px 8px 0;
}

.btn-primary-custom {
  background: linear-gradient(
    135deg,
    var(--accent-color) 0%,
    var(--primary-color) 100%
  );
  border: none;
  padding: 0.75rem 2rem;
  font-weight: 600;
  border-radius: 8px;
  transition: transform 0.3s, box-shadow 0.3s;
  width: 100%;
  color: white;
}

.btn-primary-custom:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(49, 130, 206, 0.3);
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--secondary-color) 100%
  );
}

.divider {
  text-align: center;
  margin: 1.5rem 0;
  position: relative;
}

.divider::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  background: #e2e8f0;
}

.divider span {
  background: white;
  padding: 0 1rem;
  position: relative;
  color: #718096;
  font-size: 0.9rem;
}

.social-login {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn-social {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  background: white;
  transition: all 0.3s;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-social:hover {
  border-color: var(--accent-color);
  background: var(--light-bg);
}

.btn-google {
  color: #db4437;
}

.btn-facebook {
  color: #4267b2;
}

.form-check-input:checked {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
}

.text-link {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

.text-link:hover {
  color: var(--primary-color);
}

.toggle-form {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

.alert {
  border-radius: 8px;
  border: none;
}

/* Animation */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

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

.hidden {
  display: none;
}