/* ========================================
   KanaSG Platform - Professional Auth Pages
   Login, Register, Recover Password Styles
   ======================================== */

/* ===== SPLIT LAYOUT CONTAINER ===== */
.split-layout-container {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  font-family: var(--font-family-primary);
  position: relative;
  overflow: hidden;
}

/* ===== LEFT PANEL - BRANDING ===== */
.image-panel {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 50%, var(--primary-900) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  color: white;
  overflow: hidden;
  padding: var(--space-8);
}

.image-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.image-panel-text {
  text-align: center;
  z-index: 2;
  position: relative;
  max-width: 500px;
  width: 100%;
  padding: var(--space-6);
  animation: fadeInUp 0.8s ease-out;
}

.image-panel-text h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-tight);
  color: white;
}

.image-panel-text p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: rgba(255, 255, 255, 0.9);
  font-weight: var(--font-weight-normal);
}

/* ===== RIGHT PANEL - FORM ===== */
.form-panel {
  background: var(--gray-50);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  position: relative;
}

.form-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 30% 70%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

/* ===== LOGIN CARD ===== */
.account-card {
  width: 100%;
  max-width: 420px;
  background: var(--white);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  padding: var(--space-16) var(--space-10) var(--space-10) var(--space-10);
  position: relative;
  z-index: 2;
  animation: slideInRight 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  margin: var(--space-6);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.account-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

.account-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-700) 100%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ===== LOGO & HEADER ===== */
.account-card .text-center img {
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
  transition: transform var(--transition-base);
  margin-bottom: var(--space-2);
}

.account-card .text-center img:hover {
  transform: scale(1.05);
}

.account-card h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
  margin: var(--space-4) 0 var(--space-2) 0;
}

.account-card .text-muted {
  font-size: var(--font-size-base);
  color: var(--gray-600);
  margin-bottom: var(--space-8);
}

/* ===== FORM INPUTS ENHANCEMENT ===== */
.form-floating {
  position: relative;
  margin: var(--space-3) var(--space-6) var(--space-8) var(--space-6);
}

.form-floating .form-control {
  height: calc(3.5rem + 2px);
  line-height: 1.25;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  background-color: var(--gray-50);
  padding: 1rem 0.75rem 0.25rem;
}

.form-floating .form-control:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 0.25rem rgba(99, 102, 241, 0.25);
  background-color: var(--white);
  outline: none;
}

.form-floating label {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  padding: 1rem 0.75rem;
  pointer-events: none;
  border: 1px solid transparent;
  transform-origin: 0 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  color: var(--gray-600);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  z-index: 2;
}

.form-floating .form-control:focus ~ label,
.form-floating .form-control:not(:placeholder-shown) ~ label {
  opacity: 0.65;
  color: var(--primary-600);
  transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

/* ===== VALIDATION STATES ===== */
.form-floating .form-control.validating {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23868e96'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='M6 3v3l2 1'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1rem;
  animation: spin 1s linear infinite;
}

.form-floating .form-control.is-valid-realtime {
  border-color: var(--success);
  padding-right: calc(1.5em + 0.75rem);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' fill='%2310b981'%3e%3cpath d='m2.3 6.73.94-.94 1.93 1.93 3.31-3.31.94.94L4.26 9.67z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right calc(0.375em + 0.1875rem) center;
  background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-floating .form-control.is-valid-realtime:focus {
  border-color: var(--success);
  box-shadow: 0 0 0 0.25rem rgba(16, 185, 129, 0.25);
}

.form-floating .form-control.is-invalid-realtime {
  border-color: var(--error);
  padding-right: calc(1.5em + 0.75rem);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23ef4444'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='m9 3-6 6m0-6 6 6'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right calc(0.375em + 0.1875rem) center;
  background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-floating .form-control.is-invalid-realtime:focus {
  border-color: var(--error);
  box-shadow: 0 0 0 0.25rem rgba(239, 68, 68, 0.25);
}

/* ===== VALIDATION MESSAGES ===== */
.validation-message {
  display: flex;
  align-items: center;
  margin-top: 0.25rem;
  font-size: var(--font-size-sm);
  line-height: 1.25;
  color: var(--error);
  font-weight: var(--font-weight-medium);
  animation: slideInUp 0.3s ease-out;
}

.validation-message.valid-feedback-realtime {
  color: var(--success);
}

.validation-message.invalid-feedback-realtime {
  color: var(--error);
}

.validation-message .feedback-icon {
  margin-right: 0.375rem;
  font-size: 0.75rem;
}

/* ===== ALERT ENHANCEMENT ===== */
.alert-danger {
  background: var(--error-light);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-lg);
  color: var(--error);
  font-weight: var(--font-weight-medium);
  padding: var(--space-5);
  margin: var(--space-3) var(--space-6) var(--space-6) var(--space-6);
}

/* ===== BUTTON ENHANCEMENT ===== */
.btn-primary.btn-lg {
  height: 56px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  min-width: 200px;
  max-width: 280px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

.btn-primary.btn-lg::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary.btn-lg:hover::before {
  left: 100%;
}

.btn-primary.btn-lg:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

.btn-primary.btn-lg:active {
  transform: translateY(0);
  transition: transform 0.1s;
}

.btn-primary.btn-lg:focus {
  box-shadow: 0 0 0 0.25rem rgba(99, 102, 241, 0.25);
  outline: none;
}

.btn-primary.btn-lg:disabled {
  background: var(--gray-400);
  transform: none;
  box-shadow: none;
  opacity: 0.65;
}

.btn-primary.btn-lg:disabled::before {
  display: none;
}

/* ===== LINKS ENHANCEMENT ===== */
.account-card a {
  color: var(--primary-600);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  position: relative;
}

.account-card a:hover {
  color: var(--primary-700);
}

.account-card a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-500);
  transition: width var(--transition-base);
}

.account-card a:hover::after {
  width: 100%;
}

/* ===== DIVIDER ENHANCEMENT ===== */
.account-card hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-200), transparent);
  margin: var(--space-6) 0;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .split-layout-container {
    grid-template-columns: 1fr;
  }
  
  .image-panel {
    display: none;
  }
  
  .form-panel {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--gray-50) 100%);
    padding: var(--space-6);
  }
}

@media (max-width: 768px) {
  .form-panel {
    padding: var(--space-5);
  }
  
  .account-card {
    margin: var(--space-5);
    padding: var(--space-12) var(--space-8) var(--space-8) var(--space-8);
    transform: none;
  }
  
  .account-card:hover {
    transform: none;
  }
  
  .form-floating {
    margin: var(--space-2) var(--space-5) var(--space-6) var(--space-5);
  }
}

@media (max-width: 640px) {
  .form-panel {
    padding: var(--space-4);
  }
  
  .account-card {
    padding: var(--space-10) var(--space-6) var(--space-6) var(--space-6);
    margin: var(--space-4);
    max-width: none;
    transform: none;
  }
  
  .account-card:hover {
    transform: none;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  }
  
  .form-floating {
    margin: var(--space-2) var(--space-4) var(--space-5) var(--space-4);
  }
  
  .account-card h3 {
    font-size: var(--font-size-2xl);
  }
  
  .image-panel-text h2 {
    font-size: var(--font-size-3xl);
  }
  
  .form-floating .form-control {
    height: calc(3.25rem + 2px);
  }
  
  .btn-primary.btn-lg {
    height: 52px;
    min-width: 180px;
  }
  
  .btn-primary.btn-lg:hover {
    transform: translateY(-1px);
  }
}

@media (max-width: 480px) {
  .form-panel {
    padding: var(--space-3);
  }
  
  .account-card {
    margin: var(--space-3);
    padding: var(--space-8) var(--space-5) var(--space-5) var(--space-5);
  }
  
  .form-floating {
    margin: var(--space-1) var(--space-3) var(--space-4) var(--space-3);
  }
  
  .account-card h3 {
    font-size: var(--font-size-xl);
  }
}

@media (max-width: 360px) {
  .form-panel {
    padding: var(--space-2);
  }
  
  .account-card {
    margin: var(--space-2);
    padding: var(--space-5) var(--space-3) var(--space-3) var(--space-3);
  }
  
  .account-card h3 {
    font-size: var(--font-size-lg);
  }
  
  .form-floating .form-control {
    height: 48px;
  }
  
  .btn-primary.btn-lg {
    height: 46px;
  }
}

/* ===== LOADING SPINNER ENHANCEMENT ===== */
.spinner-border-sm {
  color: rgba(255, 255, 255, 0.8);
}

/* ===== ANIMATIONS ===== */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0, 0, 0);
  }
  40%, 43% {
    transform: translate3d(0, -6px, 0);
  }
  70% {
    transform: translate3d(0, -3px, 0);
  }
  90% {
    transform: translate3d(0, -1px, 0);
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  .animate-fade-in-up,
  .animate-slide-in-right,
  .account-card,
  .image-panel-text {
    animation: none;
  }
  
  .btn-primary.btn-lg:hover {
    transform: none;
  }
}

/* ===== FOCUS VISIBLE FOR ACCESSIBILITY ===== */
.form-control:focus-visible,
.btn:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}