/* ================================================
   Authentication Pages - Modern Design (Linear-inspired)
   ================================================ */

/* ===== Login/Signup Page Styles ===== */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

/* Background gradient effect */
.auth-container::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(94, 106, 210, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
  animation: rotateGradient 20s linear infinite;
  pointer-events: none;
}

@keyframes rotateGradient {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: rgba(22, 24, 29, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl), 0 0 80px rgba(94, 106, 210, 0.1);
  position: relative;
  z-index: 1;
  animation: slideUpFade 0.6s ease-out;
}

@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Glow effect on top */
.auth-card::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0.8;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.auth-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(94, 106, 210, 0.3);
  animation: pulse 3s ease-in-out infinite;
}

.auth-logo img {
  width: 40px;
  height: 40px;
  filter: brightness(0) invert(1);
}

.auth-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Form styles */
.auth-form {
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--surface-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-base);
  outline: none;
}

.form-input:focus {
  background: var(--surface-lighter);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(94, 106, 210, 0.1);
}

.form-input::placeholder {
  color: var(--text-tertiary);
}

.form-input.error {
  border-color: var(--error);
}

.form-error {
  margin-top: var(--spacing-xs);
  color: var(--error);
  font-size: 0.75rem;
}

/* Remember me checkbox */
.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-checkbox label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
}

/* Submit button */
.btn-primary {
  width: 100%;
  padding: 14px 24px;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(94, 106, 210, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(94, 106, 210, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Ripple effect */
.btn-primary::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-primary:active::after {
  width: 300px;
  height: 300px;
}

/* Divider */
.auth-divider {
  position: relative;
  text-align: center;
  margin: var(--spacing-lg) 0;
}

.auth-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

.auth-divider span {
  position: relative;
  padding: 0 var(--spacing-md);
  background: rgba(22, 24, 29, 0.95);
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Social login buttons */
.social-login {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.btn-social {
  width: 100%;
  padding: 12px 20px;
  background: var(--surface-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.btn-social:hover {
  background: var(--surface-lighter);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-social:active {
  transform: translateY(0);
}

.btn-social-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Specific social button styles */
.btn-google:hover {
  border-color: #4285f4;
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

.btn-kakao:hover {
  border-color: #fee500;
  box-shadow: 0 4px 12px rgba(254, 229, 0, 0.3);
}

.btn-naver:hover {
  border-color: #03c75a;
  box-shadow: 0 4px 12px rgba(3, 199, 90, 0.3);
}

/* Guest login section */
.guest-section {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
  text-align: center;
}

.guest-info {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.guest-count {
  color: var(--primary);
  font-weight: 600;
}

.btn-guest {
  width: 100%;
  padding: 12px 20px;
  background: transparent;
  border: 1px solid var(--primary);
  border-radius: var(--radius-md);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-sm);
}

.btn-guest:hover {
  background: rgba(94, 106, 210, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(94, 106, 210, 0.2);
}

.btn-guest:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Footer links */
.auth-footer {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

.auth-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.auth-link-primary {
  color: var(--primary);
  font-weight: 500;
}

/* Toggle between login/signup */
.auth-toggle {
  margin-top: var(--spacing-md);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.auth-toggle a {
  color: var(--primary);
  font-weight: 500;
  margin-left: 4px;
}

/* User menu dropdown */
.user-menu {
  position: relative;
}

.user-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-btn:hover {
  background: var(--surface-light);
  border-color: var(--primary);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.user-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 10px 16px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.dropdown-item:hover {
  background: var(--surface-light);
  color: var(--text-primary);
}

.dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

/* Messages and notifications */
.message {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-success {
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.3);
  color: var(--success);
}

.message-error {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--error);
}

.message-info {
  background: rgba(96, 165, 250, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  color: var(--info);
}

/* Loading states */
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .auth-card {
    padding: var(--spacing-lg);
  }
  
  .auth-title {
    font-size: 1.5rem;
  }
  
  .btn-primary,
  .btn-social,
  .btn-guest {
    padding: 12px 16px;
  }
}