/* ========================================
   Page Header Component
   ページヘッダー共通スタイル
   ======================================== */

/* ========== Base Page Header ========== */
.page-header {
  margin-bottom: 1.5rem;
  position: relative;
}

/* レスポンシブ調整 */
@media (max-width: 768px) {
  .page-header {
    margin-bottom: 1.25rem;
  }
}

@media (max-width: 576px) {
  .page-header {
    margin-bottom: 1rem;
    text-align: center;
  }
}

/* ========== Page Title ========== */
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  line-height: 1.3;
}

/* タイトルアイコン */
.page-title i {
  color: var(--primary-color);
  font-size: 1.25em;
  flex-shrink: 0;
}

/* タイトルテキスト */
.page-title-text {
  flex: 1;
  word-break: break-word;
}

/* レスポンシブ調整 */
@media (max-width: 768px) {
  .page-title {
    font-size: 1.25rem;
  }
  
  .page-title i {
    font-size: 1.2em;
  }
}

@media (max-width: 576px) {
  .page-header {
    flex-direction: column;
    align-items: center;
  }
  
  .page-title {
    font-size: 1.125rem;
    justify-content: center;
    text-align: center;
  }
  
  .page-title i {
    font-size: 1.1em;
  }
}

/* ========== Page Subtitle ========== */
.page-subtitle,
.subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0;
  line-height: 1.5;
  max-width: 1200px;
}

@media (max-width: 768px) {
  .page-subtitle,
  .subtitle {
    font-size: 0.875rem;
  }
}

@media (max-width: 576px) {
  .page-subtitle,
  .subtitle {
    font-size: 0.8125rem;
    text-align: center;
  }
}

/* ========== Page Header with Actions ========== */
.page-header-with-actions {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.page-header-content {
  flex: 1;
  min-width: 0;
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .page-header-with-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .page-header-actions {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .page-header-actions {
    flex-direction: column;
  }
  
  .page-header-actions .btn {
    width: 100%;
  }
}

/* ========== Page Header Breadcrumb ========== */
.page-header-breadcrumb {
  margin-bottom: 0.75rem;
}

.page-header-breadcrumb .breadcrumb {
  background-color: transparent;
  padding: 0;
  margin-bottom: 0;
  font-size: 0.875rem;
}

.page-header-breadcrumb .breadcrumb-item {
  color: var(--text-secondary);
}

.page-header-breadcrumb .breadcrumb-item.active {
  color: var(--text-primary);
}

.page-header-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
  color: var(--text-tertiary);
}

@media (max-width: 576px) {
  .page-header-breadcrumb {
    display: none;
  }
}

/* ========== Page Header Badge ========== */
.page-header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  margin-left: 0.5rem;
}

.page-header-badge.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

.page-header-badge.badge-success {
  background-color: var(--success-light);
  color: var(--success-color);
}

.page-header-badge.badge-warning {
  background-color: var(--warning-light);
  color: var(--warning-color);
}

.page-header-badge.badge-danger {
  background-color: var(--danger-light);
  color: var(--danger-color);
}

.page-header-badge.badge-info {
  background-color: var(--info-light);
  color: var(--info-color);
}

@media (max-width: 576px) {
  .page-header-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
  }
}

/* ========== Page Header Meta Info ========== */
.page-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.page-header-meta-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.page-header-meta-item i {
  color: var(--text-tertiary);
}

@media (max-width: 768px) {
  .page-header-meta {
    font-size: 0.8125rem;
    gap: 0.75rem;
  }
}

@media (max-width: 576px) {
  .page-header-meta {
    justify-content: center;
    font-size: 0.75rem;
  }
}

/* ========== Section Header ========== */
.section-header {
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-primary);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title i {
  color: var(--primary-color);
  font-size: 1.1em;
}

.section-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .section-header {
    margin-bottom: 1rem;
  }
  
  .section-title {
    font-size: 1.125rem;
  }
  
  .section-subtitle {
    font-size: 0.8125rem;
  }
}

@media (max-width: 576px) {
  .section-title {
    font-size: 1.05rem;
  }
}

/* ========== Decorative Headers ========== */
.page-header-gradient {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.page-header-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transform: translate(30px, -30px);
}

.page-header-gradient .page-title,
.page-header-gradient .page-subtitle {
  color: white;
}

.page-header-gradient .page-title i {
  color: rgba(255, 255, 255, 0.9);
}

@media (max-width: 768px) {
  .page-header-gradient {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
  }
}

@media (max-width: 576px) {
  .page-header-gradient {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
  }
}

/* ========== Stats Header ========== */
.page-header-stats {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
}

.page-header-stats .stats-row {
  display: flex;
  justify-content: space-around;
  gap: 1rem;
  margin-top: 1rem;
}

.page-header-stats .stat-item {
  text-align: center;
  flex: 1;
}

.page-header-stats .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.page-header-stats .stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .page-header-stats {
    padding: 1.25rem 1rem;
  }
  
  .page-header-stats .stats-row {
    gap: 0.5rem;
  }
  
  .page-header-stats .stat-value {
    font-size: 1.5rem;
  }
  
  .page-header-stats .stat-label {
    font-size: 0.75rem;
  }
}

@media (max-width: 576px) {
  .page-header-stats .stats-row {
    flex-wrap: wrap;
  }
  
  .page-header-stats .stat-item {
    flex: 0 0 calc(50% - 0.25rem);
  }
}

/* ========== Print Styles ========== */
@media print {
  .page-header {
    margin-bottom: 1rem;
  }
  
  .page-title {
    font-size: 1.5rem;
    color: #000;
  }
  
  .page-title i {
    display: none;
  }
  
  .page-header-gradient,
  .page-header-stats {
    background: white !important;
    color: #000 !important;
    border: 1px solid #ccc;
    box-shadow: none !important;
  }
  
  .page-header-actions {
    display: none;
  }
}

/* ========== Accessibility ========== */
@media (prefers-contrast: high) {
  .page-title {
    color: #000;
  }
  
  .page-title i {
    color: #000;
  }
  
  .page-header-gradient,
  .page-header-stats {
    border: 2px solid #000;
  }
}

/* ========== Usage Examples (Comment) ========== */
/*
基本的な使用例:

1. シンプルなヘッダー:
<div class="page-header">
  <h1 class="page-title">
    <i class="bi bi-journal-text"></i>
    <span>ページタイトル</span>
  </h1>
  <p class="page-subtitle">ページの説明文</p>
</div>

2. アクション付きヘッダー:
<div class="page-header page-header-with-actions">
  <div class="page-header-content">
    <h1 class="page-title">
      <i class="bi bi-journal-text"></i>
      <span>ページタイトル</span>
    </h1>
    <p class="page-subtitle">ページの説明文</p>
  </div>
  <div class="page-header-actions">
    <button class="btn btn-primary">アクション</button>
  </div>
</div>

3. バッジ付きヘッダー:
<h1 class="page-title">
  <i class="bi bi-journal-text"></i>
  <span>ページタイトル</span>
  <span class="page-header-badge badge-primary">NEW</span>
</h1>

4. セクションヘッダー:
<div class="section-header">
  <h2 class="section-title">
    <i class="bi bi-list"></i>
    <span>セクションタイトル</span>
  </h2>
  <p class="section-subtitle">セクションの説明</p>
</div>
*/