/* ========================================
   MODERN FORMS & INPUTS FRAMEWORK
   Beautiful, User-Friendly Form Components
   ======================================== */

/* CSS Custom Properties for Theming */
:root {
  /* Primary Colors */
  --form-primary: #667eea;
  --form-primary-light: #a5b4fc;
  --form-primary-dark: #4f46e5;
  --form-primary-rgb: 102, 126, 234;
  
  /* Secondary Colors */
  --form-secondary: #64748b;
  --form-secondary-light: #94a3b8;
  --form-secondary-dark: #475569;
  
  /* Success Colors */
  --form-success: #10b981;
  --form-success-light: #34d399;
  --form-success-rgb: 16, 185, 129;
  
  /* Warning Colors */
  --form-warning: #f59e0b;
  --form-warning-light: #fbbf24;
  --form-warning-rgb: 245, 158, 11;
  
  /* Error Colors */
  --form-error: #ef4444;
  --form-error-light: #f87171;
  --form-error-rgb: 239, 68, 68;
  
  /* Neutral Colors */
  --form-gray-50: #f8fafc;
  --form-gray-100: #f1f5f9;
  --form-gray-200: #e2e8f0;
  --form-gray-300: #cbd5e1;
  --form-gray-400: #94a3b8;
  --form-gray-500: #64748b;
  --form-gray-600: #475569;
  --form-gray-700: #334155;
  --form-gray-800: #1e293b;
  --form-gray-900: #0f172a;
  
  /* Spacing */
  --form-spacing-xs: 0.25rem;
  --form-spacing-sm: 0.5rem;
  --form-spacing-md: 1rem;
  --form-spacing-lg: 1.5rem;
  --form-spacing-xl: 2rem;
  
  /* Border Radius */
  --form-radius-sm: 0.375rem;
  --form-radius-md: 0.5rem;
  --form-radius-lg: 0.75rem;
  --form-radius-xl: 1rem;
  
  /* Shadows */
  --form-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --form-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --form-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --form-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --form-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --form-transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   FORM SECTIONS & GROUPING
   ======================================== */

.form-section {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--form-radius-lg);
  border: 1px solid var(--form-gray-200);
  transition: var(--form-transition);
}

.form-section:hover {
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--form-shadow-md);
}

.form-section-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--form-gray-200);
}

.form-section-title {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--form-gray-800);
  margin-bottom: 0.5rem;
}

.form-section-title i {
  margin-right: 0.75rem;
  color: var(--form-primary);
  font-size: 1.125rem;
}

.form-section-subtitle {
  color: var(--form-gray-600);
  font-size: 0.875rem;
  margin: 0;
  font-weight: 500;
}

/* Luggage Item Cards */
.luggage-details-section {
  margin-top: 1.5rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.3);
  border-radius: var(--form-radius-md);
  border: 1px solid var(--form-gray-200);
}

.luggage-item-card {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--form-gray-200);
  border-radius: var(--form-radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
  transition: var(--form-transition);
}

.luggage-item-card:hover {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--form-shadow-sm);
  transform: translateY(-1px);
}

.luggage-item-card:last-child {
  margin-bottom: 0;
}

/* ========================================
   FORM CONTAINER & LAYOUT
   ======================================== */

.modern-form-container {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-radius: var(--form-radius-xl);
  padding: var(--form-spacing-xl);
  box-shadow: var(--form-shadow-lg);
  border: 1px solid var(--form-gray-200);
  position: relative;
  overflow: hidden;
}

.modern-form-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--form-primary), var(--form-primary-light));
}

.modern-form-header {
  text-align: center;
  margin-bottom: var(--form-spacing-xl);
  padding-bottom: var(--form-spacing-lg);
  border-bottom: 1px solid var(--form-gray-200);
}

.modern-form-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--form-gray-800);
  margin-bottom: var(--form-spacing-sm);
  background: linear-gradient(135deg, var(--form-primary), var(--form-primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modern-form-subtitle {
  color: var(--form-gray-600);
  font-size: 1rem;
  font-weight: 400;
}

/* ========================================
   FORM GROUPS & FIELDS
   ======================================== */

.modern-form-group {
  margin-bottom: var(--form-spacing-lg);
  position: relative;
}

.modern-form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--form-spacing-lg);
  margin-bottom: var(--form-spacing-lg);
}

.modern-form-row-2 {
  grid-template-columns: repeat(2, 1fr);
}

.modern-form-row-3 {
  grid-template-columns: repeat(3, 1fr);
}

.modern-form-row-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ========================================
   LABELS
   ======================================== */

.modern-form-label {
  display: flex;
  align-items: center;
  font-weight: 600;
  color: var(--form-gray-700);
  margin-bottom: var(--form-spacing-sm);
  font-size: 0.875rem;
  line-height: 1.25rem;
  transition: var(--form-transition);
}

.modern-form-label i {
  margin-right: var(--form-spacing-sm);
  color: var(--form-primary);
  font-size: 0.875rem;
  width: 16px;
  text-align: center;
}

.modern-form-label.required::after {
  content: '*';
  color: var(--form-error);
  margin-left: var(--form-spacing-xs);
  font-weight: 700;
}

/* ========================================
   INPUT WRAPPER & CONTAINER
   ======================================== */

.modern-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.modern-input-container {
  position: relative;
  width: 100%;
}

/* ========================================
   TEXT INPUTS
   ======================================== */

.modern-input {
  width: 100%;
  padding: 0.875rem 1rem;
  padding-left: 2.75rem;
  border: 2px solid var(--form-gray-200);
  border-radius: var(--form-radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--form-gray-800);
  background: var(--form-gray-50);
  transition: var(--form-transition);
  outline: none;
  box-shadow: var(--form-shadow-sm);
}

.modern-input:focus {
  border-color: var(--form-primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(var(--form-primary-rgb), 0.1);
  transform: translateY(-1px);
}

.modern-input::placeholder {
  color: var(--form-gray-400);
  font-weight: 400;
}

.modern-input:disabled {
  background: var(--form-gray-100);
  color: var(--form-gray-500);
  cursor: not-allowed;
  opacity: 0.7;
}

/* ========================================
   INPUT ICONS
   ======================================== */

.modern-input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--form-gray-400);
  font-size: 0.875rem;
  z-index: 2;
  transition: var(--form-transition);
  pointer-events: none;
}

.modern-input:focus + .modern-input-icon,
.modern-input-container:focus-within .modern-input-icon {
  color: var(--form-primary);
}

.modern-input-suffix {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--form-gray-400);
  font-size: 0.875rem;
  z-index: 2;
  transition: var(--form-transition);
}

/* ========================================
   SELECT INPUTS
   ======================================== */

.modern-select {
  width: 100%;
  padding: 0.875rem 1rem;
  padding-left: 2.75rem;
  border: 2px solid var(--form-gray-200);
  border-radius: var(--form-radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--form-gray-800);
  background: var(--form-gray-50);
  transition: var(--form-transition);
  outline: none;
  box-shadow: var(--form-shadow-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.25rem;
  padding-right: 2.5rem;
}

.modern-select:focus {
  border-color: var(--form-primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(var(--form-primary-rgb), 0.1);
  transform: translateY(-1px);
}

.modern-select:disabled {
  background: var(--form-gray-100);
  color: var(--form-gray-500);
  cursor: not-allowed;
  opacity: 0.7;
}

/* ========================================
   TEXTAREA
   ======================================== */

.modern-textarea {
  width: 100%;
  min-height: 120px;
  padding: 0.875rem 1rem;
  border: 2px solid var(--form-gray-200);
  border-radius: var(--form-radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--form-gray-800);
  background: var(--form-gray-50);
  transition: var(--form-transition);
  outline: none;
  box-shadow: var(--form-shadow-sm);
  resize: vertical;
  font-family: inherit;
  line-height: 1.5;
}

.modern-textarea:focus {
  border-color: var(--form-primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(var(--form-primary-rgb), 0.1);
  transform: translateY(-1px);
}

.modern-textarea::placeholder {
  color: var(--form-gray-400);
  font-weight: 400;
}

/* ========================================
   CHECKBOX & RADIO
   ======================================== */

.modern-checkbox-wrapper,
.modern-radio-wrapper {
  display: flex;
  align-items: center;
  margin-bottom: var(--form-spacing-sm);
  cursor: pointer;
  transition: var(--form-transition);
}

.modern-checkbox-wrapper:hover,
.modern-radio-wrapper:hover {
  transform: translateX(2px);
}

.modern-checkbox,
.modern-radio {
  width: 1.25rem;
  height: 1.25rem;
  margin-right: var(--form-spacing-sm);
  border: 2px solid var(--form-gray-300);
  border-radius: var(--form-radius-sm);
  background: var(--form-gray-50);
  cursor: pointer;
  transition: var(--form-transition);
  position: relative;
  appearance: none;
  outline: none;
}

.modern-radio {
  border-radius: 50%;
}

.modern-checkbox:checked,
.modern-radio:checked {
  background: var(--form-primary);
  border-color: var(--form-primary);
  box-shadow: 0 0 0 3px rgba(var(--form-primary-rgb), 0.1);
}

.modern-checkbox:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
}

.modern-radio:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0.5rem;
  height: 0.5rem;
  background: white;
  border-radius: 50%;
}

.modern-checkbox-label,
.modern-radio-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--form-gray-700);
  cursor: pointer;
  user-select: none;
}

/* ========================================
   FILE INPUT
   ======================================== */

.modern-file-input {
  position: relative;
  display: inline-block;
  cursor: pointer;
  width: 100%;
}

.modern-file-input input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.modern-file-input-label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  border: 2px dashed var(--form-gray-300);
  border-radius: var(--form-radius-lg);
  background: var(--form-gray-50);
  color: var(--form-gray-600);
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--form-transition);
  text-align: center;
  min-height: 120px;
}

.modern-file-input:hover .modern-file-input-label {
  border-color: var(--form-primary);
  background: rgba(var(--form-primary-rgb), 0.05);
  color: var(--form-primary);
}

.modern-file-input i {
  font-size: 1.5rem;
  margin-bottom: var(--form-spacing-sm);
  display: block;
}

/* ========================================
   BUTTONS
   ======================================== */

.modern-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: var(--form-radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--form-transition);
  position: relative;
  overflow: hidden;
  outline: none;
  box-shadow: var(--form-shadow-sm);
  min-height: 44px;
}

.modern-btn::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 0.5s;
}

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

.modern-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--form-shadow-lg);
}

.modern-btn:active {
  transform: translateY(0);
  box-shadow: var(--form-shadow-sm);
}

.modern-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--form-shadow-sm);
}

.modern-btn i {
  margin-right: var(--form-spacing-sm);
  font-size: 0.875rem;
}

/* Button Variants */
.modern-btn-primary {
  background: linear-gradient(135deg, var(--form-primary), var(--form-primary-dark));
  color: white;
}

.modern-btn-primary:hover {
  background: linear-gradient(135deg, var(--form-primary-dark), var(--form-primary));
}

.modern-btn-secondary {
  background: linear-gradient(135deg, var(--form-secondary), var(--form-secondary-dark));
  color: white;
}

.modern-btn-success {
  background: linear-gradient(135deg, var(--form-success), #059669);
  color: white;
}

.modern-btn-warning {
  background: linear-gradient(135deg, var(--form-warning), #d97706);
  color: white;
}

.modern-btn-error {
  background: linear-gradient(135deg, var(--form-error), #dc2626);
  color: white;
}

.modern-btn-outline {
  background: transparent;
  border: 2px solid var(--form-primary);
  color: var(--form-primary);
}

.modern-btn-outline:hover {
  background: var(--form-primary);
  color: white;
}

.modern-btn-ghost {
  background: transparent;
  color: var(--form-primary);
  box-shadow: none;
}

.modern-btn-ghost:hover {
  background: rgba(var(--form-primary-rgb), 0.1);
  box-shadow: none;
}

/* Button Sizes */
.modern-btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  min-height: 36px;
}

.modern-btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
  min-height: 52px;
}

.modern-btn-xl {
  padding: 1.25rem 2.5rem;
  font-size: 1.125rem;
  min-height: 60px;
}

/* ========================================
   VALIDATION STATES
   ======================================== */

.modern-input.error,
.modern-select.error,
.modern-textarea.error {
  border-color: var(--form-error);
  background: rgba(var(--form-error-rgb), 0.05);
}

.modern-input.error:focus,
.modern-select.error:focus,
.modern-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(var(--form-error-rgb), 0.1);
}

.modern-input.success,
.modern-select.success,
.modern-textarea.success {
  border-color: var(--form-success);
  background: rgba(var(--form-success-rgb), 0.05);
}

.modern-input.success:focus,
.modern-select.success:focus,
.modern-textarea.success:focus {
  box-shadow: 0 0 0 3px rgba(var(--form-success-rgb), 0.1);
}

.modern-input.warning,
.modern-select.warning,
.modern-textarea.warning {
  border-color: var(--form-warning);
  background: rgba(var(--form-warning-rgb), 0.05);
}

.modern-input.warning:focus,
.modern-select.warning:focus,
.modern-textarea.warning:focus {
  box-shadow: 0 0 0 3px rgba(var(--form-warning-rgb), 0.1);
}

/* ========================================
   ERROR & SUCCESS MESSAGES
   ======================================== */

.modern-form-message {
  display: flex;
  align-items: center;
  margin-top: var(--form-spacing-sm);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.25;
}

.modern-form-message.error {
  color: var(--form-error);
}

.modern-form-message.success {
  color: var(--form-success);
}

.modern-form-message.warning {
  color: var(--form-warning);
}

.modern-form-message.info {
  color: var(--form-primary);
}

.modern-form-message i {
  margin-right: var(--form-spacing-xs);
  font-size: 0.875rem;
}

/* ========================================
   FORM ACTIONS
   ======================================== */

.modern-form-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--form-spacing-md);
  margin-top: var(--form-spacing-xl);
  padding-top: var(--form-spacing-lg);
  border-top: 1px solid var(--form-gray-200);
}

.modern-form-actions.center {
  justify-content: center;
}

.modern-form-actions.space-between {
  justify-content: space-between;
}

/* ========================================
   LOADING STATES
   ======================================== */

.modern-btn.loading {
  pointer-events: none;
  opacity: 0.8;
}

.modern-btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: modern-spin 1s linear infinite;
  margin-left: var(--form-spacing-sm);
}

@keyframes modern-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
  .modern-form-container {
    padding: var(--form-spacing-lg);
    margin: var(--form-spacing-sm);
  }
  
  .modern-form-row {
    grid-template-columns: 1fr;
    gap: var(--form-spacing-md);
  }
  
  .modern-form-actions {
    flex-direction: column;
    gap: var(--form-spacing-sm);
  }
  
  .modern-form-actions .modern-btn {
    width: 100%;
  }
  
  .modern-form-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .modern-form-container {
    padding: var(--form-spacing-md);
    margin: var(--form-spacing-xs);
  }
  
  .modern-input,
  .modern-select,
  .modern-textarea {
    padding: 0.75rem 0.875rem;
    padding-left: 2.5rem;
  }
  
  .modern-input-icon {
    left: 0.875rem;
  }
}

/* ========================================
   DARK MODE SUPPORT
   ======================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --form-gray-50: #1e293b;
    --form-gray-100: #334155;
    --form-gray-200: #475569;
    --form-gray-300: #64748b;
    --form-gray-400: #94a3b8;
    --form-gray-500: #cbd5e1;
    --form-gray-600: #e2e8f0;
    --form-gray-700: #f1f5f9;
    --form-gray-800: #f8fafc;
    --form-gray-900: #ffffff;
  }
  
  .modern-form-container {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border-color: var(--form-gray-200);
  }
  
  .modern-input,
  .modern-select,
  .modern-textarea {
    background: var(--form-gray-100);
    color: var(--form-gray-800);
  }
  
  .modern-input:focus,
  .modern-select:focus,
  .modern-textarea:focus {
    background: var(--form-gray-50);
  }
}

/* ========================================
   ANIMATIONS & TRANSITIONS
   ======================================== */

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

@keyframes modern-slide-in {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.modern-form-group {
  animation: modern-fade-in 0.3s ease-out;
}

.modern-form-group:nth-child(even) {
  animation-delay: 0.1s;
}

.modern-form-group:nth-child(odd) {
  animation-delay: 0.2s;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.modern-form-hidden {
  display: none !important;
}

.modern-form-disabled {
  pointer-events: none;
  opacity: 0.6;
}

.modern-form-readonly .modern-input,
.modern-form-readonly .modern-select,
.modern-form-readonly .modern-textarea {
  background: var(--form-gray-100);
  cursor: default;
}

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

.modern-form-compact .modern-input,
.modern-form-compact .modern-select,
.modern-form-compact .modern-textarea {
  padding: 0.75rem 1rem;
  padding-left: 2.5rem;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

.modern-input:focus,
.modern-select:focus,
.modern-textarea:focus,
.modern-btn:focus {
  outline: 2px solid var(--form-primary);
  outline-offset: 2px;
}

.modern-checkbox:focus,
.modern-radio:focus {
  outline: 2px solid var(--form-primary);
  outline-offset: 2px;
}

/* Screen reader only text */
.modern-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  .modern-form-container {
    box-shadow: none;
    border: 1px solid #000;
  }
  
  .modern-btn {
    display: none;
  }
  
  .modern-input,
  .modern-select,
  .modern-textarea {
    border: 1px solid #000;
    background: transparent;
  }
}