/* ===============================================
   Technical Documents - Unified Design
   =============================================== */

/* === CSS Variables === */
:root {
  --bg-sidebar: #171717;
  --bg-main: #f5f3ef;
  --bg-card: #ffffff;
  --bg-muted: #f7f8f9;
  
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-green-500: #22c55e;
  --color-blue-500: #3b82f6;
  --color-orange-500: #f97316;
  --color-red-500: #ef4444;
  --color-purple-500: #8b5cf6;
  --color-pink-500: #ec4899;
  
  --text-primary: #111111;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  
  --border-color: #e5e5e5;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.12);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  
  --duration-normal: 200ms;
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

body {
  background: var(--bg-main);
}

/* === Breadcrumb === */
.breadcrumb {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 13px;
  max-width: 1200px;
  margin: 0 auto;
}

.breadcrumb-list a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb-list a:hover {
  text-decoration: underline;
}

.breadcrumb-list .current {
  color: var(--text-secondary);
}

.breadcrumb-sep {
  color: #ccc;
}

/* === Sidebar Filters === */
.sidebar-filters {
  padding: 16px 20px;
  border-top: 1px solid var(--line-border, #333);
  margin-top: 16px;
}

.filter-section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--line-text-secondary, #888);
  margin-bottom: 12px;
}

.filter-group {
  margin-bottom: 12px;
}

.filter-label {
  font-size: 11px;
  color: var(--line-text-tertiary, #666);
  display: block;
  margin-bottom: 4px;
}

.filter-select {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-size: 13px;
  background: var(--bg-card);
  cursor: pointer;
}

.filter-select:focus {
  border-color: var(--color-primary);
  outline: none;
}

.clear-filters-btn {
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  margin-top: 8px;
  transition: all var(--duration-normal);
}

.clear-filters-btn:hover {
  background: var(--bg-muted);
  border-color: var(--text-secondary);
}

/* === Documents Count === */
.documents-count {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* === Grid View === */
.documents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

/* === Document Card === */
.document-card {
  display: block;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-card);
}

.document-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
}

/* Card Header with Flag */
.document-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px 20px 0;
}

.document-flag {
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.document-title-area {
  flex: 1;
  min-width: 0;
}

.document-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px;
  line-height: 1.4;
}

.document-title-ja {
  font-size: 12px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Content */
.document-content {
  padding: 16px 20px;
}

.document-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.document-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.document-meta-item::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 3px;
  background: var(--text-tertiary);
  border-radius: 50%;
}

.document-meta-item:first-child::before {
  display: none;
}

.document-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Footer */
.document-footer {
  padding: 12px 20px;
  background: var(--bg-muted);
  border-top: 1px solid var(--border-color);
}

.document-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.document-tag {
  font-size: 11px;
  padding: 3px 8px;
  background: #fff;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

/* Tag Colors by Type */
.document-tag.type-standard {
  background: #dbeafe;
  color: #1d4ed8;
  border-color: #93c5fd;
}

.document-tag.type-regulation {
  background: #fef3c7;
  color: #b45309;
  border-color: #fcd34d;
}

.document-tag.type-guideline {
  background: #dcfce7;
  color: #166534;
  border-color: #86efac;
}

.document-tag.type-certification {
  background: #e0e7ff;
  color: #4338ca;
  border-color: #a5b4fc;
}

.document-tag.type-report {
  background: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
}

.document-tag.type-registration {
  background: #f3e8ff;
  color: #7c3aed;
  border-color: #c4b5fd;
}

.document-tag.type-case-study {
  background: #cffafe;
  color: #0891b2;
  border-color: #67e8f9;
}

.document-tag.type-article {
  background: #f1f5f9;
  color: #475569;
  border-color: #cbd5e1;
}

.document-tag.type-database {
  background: #fce7f3;
  color: #be185d;
  border-color: #f9a8d4;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
  grid-column: 1 / -1;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

/* === Responsive === */
@media (max-width: 768px) {
  .documents-grid {
    grid-template-columns: 1fr;
  }
  
  .document-header {
    padding: 16px 16px 0;
  }
  
  .document-content {
    padding: 12px 16px;
  }
  
  .document-footer {
    padding: 10px 16px;
  }
}