/**
 * Empty State Component Styles
 * @description ベストプラクティスに準拠したEmptyステートのスタイル定義
 * @version 1.0.0
 */

/* ================================================================
   Empty State Base Layout
   ================================================================ */

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  width: 100%;
  padding: 60px 20px;
  box-sizing: border-box;
}

.empty-state__content {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.empty-state__content > * + * {
  margin-top: 16px;
}

/* ================================================================
   Empty State Icons
   ================================================================ */

.empty-state__content i {
  font-size: 64px;
  color: var(--gray-medium, #9ca3af);
  display: block;
  margin-bottom: 24px;
  line-height: 1;
}

.empty-state--loading i {
  color: var(--primary-blue, #4a90e2);
}

.empty-state--error i {
  color: var(--error-color, #ef4444);
}

/* ================================================================
   Empty State Typography
   ================================================================ */

.empty-state__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--navy-dark, #1e293b);
  margin: 0;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.empty-state__message {
  font-size: 16px;
  font-weight: 500;
  color: var(--gray-medium, #64748b);
  margin: 0;
  line-height: 1.6;
  /* 日本語最適化 */
  word-break: auto-phrase;
  overflow-wrap: break-word;
}

/* ================================================================
   Empty State Actions
   ================================================================ */

.empty-state-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--primary-blue, #4a90e2);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 24px;
  min-height: 44px; /* タッチターゲット */
}

.empty-state-action:hover {
  background: var(--primary-blue-hover, #3182ce);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74, 144, 226, 0.25);
}

.empty-state-action:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(74, 144, 226, 0.25);
}

.empty-state-action:focus {
  outline: 2px solid var(--primary-blue, #4a90e2);
  outline-offset: 2px;
}

/* ================================================================
   Empty State Variants
   ================================================================ */

/* Loading State */
.empty-state--loading {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border-radius: 12px;
}

.empty-state--loading .empty-state__title {
  color: var(--primary-blue, #4a90e2);
}

/* Error State */
.empty-state--error {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border-radius: 12px;
  border: 1px solid rgba(239, 68, 68, 0.1);
}

.empty-state--error .empty-state__title {
  color: var(--error-color, #dc2626);
}

.empty-state--error .empty-state-action {
  background: var(--error-color, #ef4444);
}

.empty-state--error .empty-state-action:hover {
  background: var(--error-color-hover, #dc2626);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

/* No Results State */
.empty-state--no-results {
  background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
  border-radius: 12px;
  border: 1px solid var(--gray-light, #e5e7eb);
}

/* No Data State */
.empty-state--no-data {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border-radius: 12px;
}

/* ================================================================
   Responsive Design
   ================================================================ */

/* タブレット (768px以下) */
@media (max-width: 768px) {
  .empty-state {
    padding: 40px 16px;
    min-height: 240px;
  }

  .empty-state__content i {
    font-size: 48px;
    margin-bottom: 20px;
  }

  .empty-state__title {
    font-size: 20px;
  }

  .empty-state__message {
    font-size: 14px;
  }

  .empty-state-action {
    padding: 10px 20px;
    font-size: 14px;
    margin-top: 20px;
  }
}

/* モバイル (480px以下) */
@media (max-width: 480px) {
  .empty-state {
    padding: 32px 12px;
    min-height: 200px;
  }

  .empty-state__content i {
    font-size: 40px;
    margin-bottom: 16px;
  }

  .empty-state__title {
    font-size: 18px;
  }

  .empty-state__message {
    font-size: 13px;
    line-height: 1.5;
  }

  .empty-state-action {
    padding: 12px 16px;
    font-size: 13px;
    width: 100%;
    max-width: 240px;
  }
}

/* ================================================================
   Accessibility & Animation
   ================================================================ */

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .empty-state-action {
    transition: none;
  }

  .empty-state-action:hover {
    transform: none;
  }

  .empty-state--loading i {
    animation: none;
  }
}

/* High Contrast Support */
@media (prefers-contrast: high) {
  .empty-state {
    border: 2px solid currentColor;
  }

  .empty-state__content i {
    font-weight: 900;
  }

  .empty-state-action {
    border: 2px solid currentColor;
  }
}

/* Focus Management */
.empty-state:focus-within {
  outline: 2px solid var(--primary-blue, #4a90e2);
  outline-offset: 4px;
  border-radius: 12px;
}