/* ==========================================
   이북 뷰어 모달 스타일
   ========================================== */

/* 모달 배경 */
.ebook-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.ebook-modal.active {
  opacity: 1;
  visibility: visible;
}

/* 모달 콘텐츠 */
.ebook-modal-content {
  background: var(--bg-surface);
  width: 95%;
  max-width: 1200px;
  height: 90%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.ebook-modal.active .ebook-modal-content {
  transform: scale(1) translateY(0);
}

/* 전체화면 모드 */
.ebook-modal.fullscreen {
  background: var(--bg-surface);
}

.ebook-modal.fullscreen .ebook-modal-content {
  width: 100%;
  height: 100%;
  max-width: none;
  border-radius: 0;
}

/* 이북 헤더 */
.ebook-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-primary);
}

.ebook-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ebook-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.ebook-close:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

/* 이북 뷰어 */
.ebook-viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 로딩 상태 */
.ebook-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-4);
  color: var(--text-secondary);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 에러 상태 */
.ebook-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-4);
  color: var(--text-secondary);
  text-align: center;
}

.error-icon {
  font-size: 3rem;
}

.retry-btn {
  background: var(--primary-500);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.retry-btn:hover {
  background: var(--primary-600);
}

/* 이북 콘텐츠 */
.ebook-content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* 툴바 */
.ebook-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.toolbar-left,
.toolbar-right {
  display: flex;
  gap: var(--space-2);
}

.toolbar-center {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.tool-btn {
  background: var(--hover-bg);
  border: none;
  color: var(--text-secondary);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-btn:hover {
  background: var(--primary-100);
  color: var(--primary-600);
}

[data-theme="dark"] .tool-btn:hover {
  background: rgba(6, 182, 212, 0.2);
  color: var(--primary-400);
}

.page-info {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* 이북 리더 */
.ebook-reader {
  flex: 1;
  overflow-y: auto;
  background: var(--bg-surface);
  position: relative;
}

.ebook-pages {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-8);
}

.ebook-page {
  display: none;
  min-height: calc(100vh - 200px);
}

.ebook-page.active {
  display: block;
}

.page-content {
  line-height: 1.8;
  font-size: 16px;
  color: var(--text-primary);
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  color: var(--text-primary);
  margin: var(--space-8) 0 var(--space-4) 0;
  font-weight: 700;
}

.page-content h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-content h2 {
  font-size: 2rem;
  color: var(--primary-600);
}

.page-content h3 {
  font-size: 1.5rem;
}

.page-content p {
  margin: var(--space-4) 0;
}

.page-content code {
  background: var(--gray-100);
  color: var(--gray-800);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
}

[data-theme="dark"] .page-content code {
  background: var(--dark-surface);
  color: var(--gray-300);
}

.page-content pre {
  background: var(--gray-100);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  overflow-x: auto;
  margin: var(--space-6) 0;
}

[data-theme="dark"] .page-content pre {
  background: var(--dark-surface);
}

.page-content blockquote {
  border-left: 4px solid var(--primary-500);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
}

.page-content th,
.page-content td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.page-content th {
  background: var(--gray-100);
  font-weight: 600;
}

[data-theme="dark"] .page-content th {
  background: var(--dark-surface);
}

/* 이북 네비게이션 */
.ebook-navigation {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--primary-500);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-btn:hover:not(:disabled) {
  background: var(--primary-600);
  transform: translateY(-1px);
}

.nav-btn:disabled {
  background: var(--gray-300);
  cursor: not-allowed;
  transform: none;
}

[data-theme="dark"] .nav-btn:disabled {
  background: var(--gray-700);
}

.page-slider {
  flex: 1;
  padding: 0 var(--space-4);
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--gray-200);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

[data-theme="dark"] .slider {
  background: var(--gray-700);
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-500);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  background: var(--primary-600);
  transform: scale(1.1);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-500);
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.slider::-moz-range-thumb:hover {
  background: var(--primary-600);
  transform: scale(1.1);
}

/* 첨부파일 섹션 */
.attachments-section {
  margin: var(--space-6) 0;
  padding: var(--space-6);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.attachments-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-4) 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.attachments-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.attachment-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--hover-bg);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.attachment-item:hover {
  background: var(--primary-50);
  transform: translateX(4px);
}

[data-theme="dark"] .attachment-item:hover {
  background: rgba(6, 182, 212, 0.1);
}

.attachment-icon {
  flex-shrink: 0;
}

.file-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.file-icon.pdf {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
}

.file-icon.doc {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
}

.file-icon.xls {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

.file-icon.img {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: white;
}

.file-icon.file {
  background: linear-gradient(135deg, var(--gray-400), var(--gray-500));
  color: white;
}

.attachment-info {
  flex: 1;
  min-width: 0;
}

.attachment-name {
  display: block;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-name:hover {
  color: var(--primary-600);
  text-decoration: none;
}

.attachment-size {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.download-btn {
  background: var(--primary-100);
  color: var(--primary-600);
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.download-btn:hover {
  background: var(--primary-200);
  color: var(--primary-700);
  text-decoration: none;
}

[data-theme="dark"] .download-btn {
  background: rgba(6, 182, 212, 0.2);
  color: var(--primary-400);
}

[data-theme="dark"] .download-btn:hover {
  background: rgba(6, 182, 212, 0.3);
}

/* 태그 섹션 */
.tags-section {
  margin: var(--space-6) 0;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-color);
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-item {
  background: var(--primary-100);
  color: var(--primary-700);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-lg);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tag-item:hover {
  background: var(--primary-200);
  transform: translateY(-1px);
}

[data-theme="dark"] .tag-item {
  background: rgba(6, 182, 212, 0.2);
  color: var(--primary-400);
}

[data-theme="dark"] .tag-item:hover {
  background: rgba(6, 182, 212, 0.3);
}

/* 게시물 네비게이션 */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin: var(--space-8) 0;
}

.nav-link {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav-link:hover {
  background: var(--hover-bg);
  border-color: var(--primary-300);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--text-primary);
}

.nav-link.prev-link {
  text-align: left;
}

.nav-link.next-link {
  text-align: right;
}

.nav-direction {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-link.next-link .nav-direction {
  justify-content: flex-end;
}

.nav-title {
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 댓글 섹션 */
.comments-section {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 2px solid var(--border-color);
}

.comments-header {
  margin-bottom: var(--space-6);
}

.comments-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

/* 툴팁 */
.modern-tooltip {
  position: absolute;
  background: var(--gray-900);
  color: white;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  z-index: 10000;
  opacity: 0;
  transform: translateY(4px);
  transition: all var(--transition-fast);
  pointer-events: none;
}

.modern-tooltip.show {
  opacity: 1;
  transform: translateY(0);
}

.modern-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--gray-900);
}

[data-theme="dark"] .modern-tooltip {
  background: var(--gray-100);
  color: var(--gray-900);
}

[data-theme="dark"] .modern-tooltip::after {
  border-top-color: var(--gray-100);
}

/* 토스트 메시지 */
.modern-toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--gray-900);
  color: white;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 500;
  z-index: 10000;
  opacity: 0;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.modern-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.modern-toast.info {
  background: var(--primary-500);
}

.modern-toast.success {
  background: var(--success);
}

.modern-toast.warning {
  background: var(--warning);
}

.modern-toast.error {
  background: var(--error);
}

/* ==========================================
   반응형 디자인 (모바일 우선)
   ========================================== */

/* 작은 모바일 (320px - 480px) */
@media (max-width: 480px) {
  .ebook-modal-content {
    width: 100%;
    height: 100%;
    border-radius: 0;
  }
  
  .ebook-header {
    padding: var(--space-4);
  }
  
  .ebook-title {
    font-size: 1.2rem;
  }
  
  .ebook-toolbar {
    padding: var(--space-3);
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  
  .toolbar-left,
  .toolbar-right {
    gap: var(--space-1);
  }
  
  .tool-btn {
    padding: var(--space-1);
  }
  
  .ebook-pages {
    padding: var(--space-4);
  }
  
  .page-content {
    font-size: 14px;
  }
  
  .page-content h1 {
    font-size: 1.8rem;
  }
  
  .page-content h2 {
    font-size: 1.5rem;
  }
  
  .page-content h3 {
    font-size: 1.3rem;
  }
  
  .ebook-navigation {
    padding: var(--space-3);
    flex-wrap: wrap;
  }
  
  .nav-btn {
    padding: var(--space-2) var(--space-3);
    font-size: 0.85rem;
  }
  
  .post-navigation {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  
  .attachments-section {
    padding: var(--space-4);
  }
  
  .attachment-item {
    padding: var(--space-2);
  }
  
  .file-icon {
    width: 32px;
    height: 32px;
    font-size: 0.6rem;
  }
  
  .attachment-name {
    font-size: 0.9rem;
  }
}

/* 모바일 (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  .ebook-modal-content {
    width: 98%;
    height: 95%;
  }
  
  .ebook-pages {
    padding: var(--space-6);
  }
  
  .page-content {
    font-size: 15px;
  }
  
  .page-content h1 {
    font-size: 2rem;
  }
  
  .page-content h2 {
    font-size: 1.7rem;
  }
  
  .ebook-navigation {
    flex-wrap: nowrap;
  }
  
  .post-navigation {
    grid-template-columns: 1fr;
  }
}

/* 태블릿 (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .ebook-modal-content {
    width: 90%;
    height: 90%;
  }
  
  .post-navigation {
    grid-template-columns: 1fr 1fr;
  }
}

/* 큰 화면 (1025px+) */
@media (min-width: 1025px) {
  .ebook-modal-content {
    width: 95%;
    max-width: 1400px;
  }
  
  .ebook-pages {
    max-width: 900px;
    padding: var(--space-12);
  }
  
  .page-content {
    font-size: 17px;
    line-height: 1.9;
  }
  
  .page-content h1 {
    font-size: 3rem;
  }
  
  .page-content h2 {
    font-size: 2.2rem;
  }
  
  .page-content h3 {
    font-size: 1.7rem;
  }
}

/* 랜드스케이프 모드 */
@media (orientation: landscape) and (max-height: 600px) {
  .ebook-modal-content {
    height: 98%;
  }
  
  .ebook-header {
    padding: var(--space-3) var(--space-6);
  }
  
  .ebook-title {
    font-size: 1.2rem;
  }
  
  .ebook-toolbar {
    padding: var(--space-2) var(--space-6);
  }
  
  .ebook-navigation {
    padding: var(--space-2) var(--space-6);
  }
}

/* 고해상도 디스플레이 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .file-icon {
    background-size: cover;
  }
  
  .loading-spinner {
    border-width: 2px;
  }
}

/* 다크모드 특화 스타일 */
[data-theme="dark"] .ebook-modal {
  background: rgba(15, 15, 35, 0.9);
}

[data-theme="dark"] .ebook-modal-content {
  border: 1px solid var(--dark-border);
}

[data-theme="dark"] .ebook-pages {
  background: var(--dark-bg-primary);
}

/* 접근성 개선 */
@media (prefers-reduced-motion: reduce) {
  .ebook-modal,
  .ebook-modal-content,
  .tool-btn,
  .nav-btn,
  .attachment-item,
  .modern-tooltip,
  .modern-toast {
    transition: none;
  }
  
  .loading-spinner {
    animation: none;
  }
}

/* 고대비 모드 */
@media (prefers-contrast: high) {
  .ebook-modal {
    background: rgba(0, 0, 0, 0.95);
  }
  
  .tool-btn,
  .nav-btn {
    border: 2px solid currentColor;
  }
  
  .attachment-item {
    border: 1px solid var(--text-primary);
  }
}

/* 인쇄 스타일 */
@media print {
  .ebook-modal {
    position: static;
    background: none;
    backdrop-filter: none;
  }
  
  .ebook-modal-content {
    width: 100%;
    height: auto;
    box-shadow: none;
    border: none;
  }
  
  .ebook-header,
  .ebook-toolbar,
  .ebook-navigation {
    display: none;
  }
  
  .ebook-pages {
    max-width: none;
    padding: 0;
  }
  
  .page-content {
    color: #000;
    font-size: 12pt;
    line-height: 1.6;
  }
  
  .page-content h1,
  .page-content h2,
  .page-content h3 {
    color: #000;
    page-break-after: avoid;
  }
  
  .attachment-item,
  .tag-item {
    page-break-inside: avoid;
  }
}