/**
 * COMPONENTS.CSS
 * Reusable UI components: buttons, cards, inputs, modals, navigation
 */

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-normal);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-base) var(--easing-ease);
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px; /* WCAG touch target size */
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--text-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--text-lg);
  min-height: 52px;
}

/* Button Variants */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: var(--gradient-primary-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: var(--color-bg-primary);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-success {
  background: var(--color-success);
  color: var(--color-text-inverse);
}

.btn-success:hover:not(:disabled) {
  background: var(--color-success-dark);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-text-inverse);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-error-dark);
}

.btn-info {
  background: var(--color-info);
  color: var(--color-text-inverse);
}

.btn-info:hover:not(:disabled) {
  background: var(--color-info-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-gray-100);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-6);
  transition: box-shadow var(--duration-base) var(--easing-ease);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--spacing-4);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border-light);
}

.card-title {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.card-body {
  color: var(--color-text-secondary);
}

.card-footer {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border-light);
}

/* Glassmorphic Card Variant */
.card-glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  color: var(--color-text-inverse);
}

.card-glass .card-title {
  color: var(--color-text-inverse);
}

.card-glass .card-body {
  color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   FORM INPUTS
   ============================================ */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--text-base);
  font-family: var(--font-family-primary);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-md);
  transition: all var(--duration-base) var(--easing-ease);
  min-height: 44px; /* WCAG touch target */
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background: var(--color-gray-100);
  color: var(--color-text-tertiary);
  cursor: not-allowed;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.form-label.required::after {
  content: " *";
  color: var(--color-error);
}

.form-error {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--spacing-1);
}

.form-help {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--spacing-1);
}

/* ============================================
   NAVIGATION
   ============================================ */
.app-nav {
  position: sticky;
  top: 0;
  height: var(--nav-height);
  background: var(--nav-bg);
  color: var(--nav-text-color);
  box-shadow: var(--shadow-md);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-6);
}

.app-nav-brand {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--nav-text-color);
  text-decoration: none;
}

.app-nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.app-nav-link {
  color: var(--nav-text-color);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-md);
  transition: background var(--duration-base) var(--easing-ease);
}

.app-nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
}

.app-nav-link.active {
  background: rgba(255, 255, 255, 0.2);
}

.app-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--nav-text-color);
  cursor: pointer;
  padding: var(--spacing-2);
  min-height: 44px;
  min-width: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}

.app-nav-toggle span {
  display: block;
  width: 24px;
  height: 3px;
  background-color: var(--nav-text-color);
  border-radius: 2px;
  transition: all var(--duration-base) var(--easing-ease);
}

.app-nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.app-nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.app-nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

@media (max-width: 768px) {
  .app-nav-toggle {
    display: block;
  }
  
  .app-nav-menu {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    height: calc(100vh - var(--nav-height));
    width: 280px;
    background: var(--nav-bg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-4);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--easing-ease);
    box-shadow: var(--shadow-xl);
  }
  
  .app-nav-menu.open {
    transform: translateX(0);
  }
  
  .app-nav-link {
    width: 100%;
    text-align: left;
  }
}

/* ============================================
   MODALS
   ============================================ */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-overlay);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
  animation: fadeIn var(--duration-base) var(--easing-ease);
}

.modal {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: var(--z-modal);
  animation: slideUp var(--duration-slow) var(--easing-ease);
}

.modal-lg {
  max-width: 800px;
}

.modal-xl {
  max-width: 1200px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-border-light);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: var(--text-2xl);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-2);
  min-height: 44px;
  min-width: 44px;
  border-radius: var(--radius-md);
  transition: background var(--duration-base) var(--easing-ease);
}

.modal-close:hover {
  background: var(--color-gray-100);
}

.modal-body {
  padding: var(--spacing-6);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-3);
  padding: var(--spacing-6);
  border-top: 1px solid var(--color-border-light);
}

/* Modal Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

/* ============================================
   BADGES / TAGS
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background: var(--color-primary-lightest);
  color: var(--color-primary-dark);
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success-dark);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-dark);
}

.badge-error {
  background: var(--color-error-bg);
  color: var(--color-error-dark);
}

.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info-dark);
}

/* ============================================
   ALERTS / NOTIFICATIONS
   ============================================ */
.alert {
  padding: var(--spacing-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  border-left: 4px solid;
}

.alert-success {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success-dark);
}

.alert-warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: var(--color-warning-dark);
}

.alert-error {
  background: var(--color-error-bg);
  border-color: var(--color-error);
  color: var(--color-error-dark);
}

.alert-info {
  background: var(--color-info-bg);
  border-color: var(--color-info);
  color: var(--color-info-dark);
}