/**
 * Loading & 404 Styles
 * Стили для компонентов загрузки и страницы ошибки
 */

/* ============================================
   404 ERROR PAGE
   ============================================ */

.screen-404 {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.error-container {
  max-width: 600px;
  width: 100%;
  text-align: center;
}

.error-animation {
  margin-bottom: 32px;
  animation: floatAnimation 3s ease-in-out infinite;
}

@keyframes floatAnimation {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.error-icon {
  font-size: 80px;
  margin-bottom: 16px;
  animation: rotateIcon 4s ease-in-out infinite;
}

@keyframes rotateIcon {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-10deg);
  }
  75% {
    transform: rotate(10deg);
  }
}

.error-code {
  font-size: 120px;
  font-weight: 800;
  color: white;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  line-height: 1;
  letter-spacing: -4px;
}

.error-content {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 40px 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.error-description {
  font-size: 16px;
  color: #666;
  line-height: 1.6;
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.error-actions .btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.error-actions .btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.error-actions .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.error-actions .btn-secondary {
  background: white;
  color: #667eea;
  border: 2px solid #667eea;
}

.error-actions .btn-secondary:hover {
  background: #667eea;
  color: white;
  transform: translateY(-2px);
}

.error-suggestions {
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  padding-top: 32px;
}

.suggestions-title {
  font-size: 14px;
  color: #666;
  margin-bottom: 16px;
  font-weight: 500;
}

.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.suggestion-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background: white;
  border: 2px solid #f0f0f0;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.suggestion-card:hover {
  border-color: #667eea;
  background: rgba(102, 126, 234, 0.05);
  transform: translateY(-2px);
}

.suggestion-icon {
  font-size: 32px;
}

.suggestion-label {
  font-size: 14px;
  font-weight: 600;
  color: #333;
}

/* ============================================
   RESPONSIVE 404
   ============================================ */

@media (max-width: 480px) {
  .error-code {
    font-size: 80px;
  }

  .error-title {
    font-size: 24px;
  }

  .error-content {
    padding: 32px 24px;
  }

  .error-actions {
    flex-direction: column;
  }

  .error-actions .btn {
    width: 100%;
  }

  .suggestions-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .suggestion-card {
    padding: 12px;
  }

  .suggestion-icon {
    font-size: 28px;
  }

  .suggestion-label {
    font-size: 12px;
  }
}

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

/* Skeleton loading для карточек */
.skeleton {
  background: linear-gradient(
    90deg,
    #f0f0f0 25%,
    #e0e0e0 50%,
    #f0f0f0 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

.skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: 12px;
}

.skeleton-card {
  height: 120px;
  margin-bottom: 16px;
}

/* Pulse loading для кнопок */
.btn-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid white;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Inline loading spinner */
.inline-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(102, 126, 234, 0.3);
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Progress bar loading */
.progress-bar-loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(102, 126, 234, 0.2);
  z-index: 9999;
  overflow: hidden;
}

.progress-bar-loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 30%;
  background: linear-gradient(90deg, #667eea, #764ba2);
  animation: progressSlide 1.5s ease-in-out infinite;
}

@keyframes progressSlide {
  0% {
    left: -30%;
  }
  100% {
    left: 100%;
  }
}

/* Dots loading */
.dots-loading {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.dots-loading span {
  width: 8px;
  height: 8px;
  background: #667eea;
  border-radius: 50%;
  animation: dotBounce 1.4s infinite ease-in-out both;
}

.dots-loading span:nth-child(1) {
  animation-delay: -0.32s;
}

.dots-loading span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes dotBounce {
  0%, 80%, 100% {
    transform: scale(0);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 20px;
  font-weight: 600;
  color: #333;
  margin-bottom: 8px;
}

.empty-state-description {
  font-size: 14px;
  color: #666;
  margin-bottom: 24px;
  max-width: 400px;
}

.empty-state-action {
  padding: 12px 24px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.empty-state-action:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

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

@media (prefers-reduced-motion: reduce) {
  .error-animation,
  .error-icon,
  .skeleton,
  .navigation-spinner,
  .inline-spinner,
  .dots-loading span {
    animation: none;
  }
}