/* ========== 全局变量 ========== */
:root {
  --color-primary: #8B6F47;
  --color-primary-light: #A88860;
  --color-primary-dark: #6B5638;
  --color-bg: #FAF7F2;
  --color-card: #FFFFFF;
  --color-border: #E8E0D5;
  --color-text: #3D3327;
  --color-text-secondary: #8C7B6B;
  --color-text-light: #B8A99A;
  --color-accent: #D4A574;
  --color-success: #52A675;
  --color-info: #4A90D9;
  --color-warning: #E8A838;
  --color-danger: #E06C5A;
  --color-shadow: rgba(139, 111, 71, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all 0.25s ease;
}

/* ========== Reset ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ========== 头部 ========== */
.header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 32px;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 3px var(--color-shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left { flex-shrink: 0; }
.header-center { flex: 1; max-width: 500px; }
.header-right { display: flex; gap: 10px; flex-shrink: 0; }

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 14px;
  transition: var(--transition);
}

.search-box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 111, 71, 0.1);
}

.search-icon { color: var(--color-text-light); flex-shrink: 0; }

.search-box input {
  border: none;
  background: none;
  outline: none;
  width: 100%;
  font-size: 14px;
  color: var(--color-text);
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 111, 71, 0.25);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: #F0EBE3;
  border-color: var(--color-primary-light);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background: #D45A48;
}

/* ========== 统计栏 ========== */
.stats-bar {
  display: flex;
  gap: 0;
  padding: 0 32px;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 24px;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
  min-width: 90px;
}

.stat-item:hover {
  background: var(--color-bg);
  border-bottom-color: var(--color-accent);
}

.stat-item.highlight {
  background: #FFF8F0;
}

.stat-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* ========== 积灰提醒 ========== */
.reminder-banner {
  margin: 16px 32px;
  background: linear-gradient(135deg, #FFF8E8, #FFF3D9);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius);
  overflow: hidden;
  animation: slideDown 0.3s ease;
}

/* ========== 书架积灰指数 ========== */
.dust-index-banner {
  margin: 0 32px 40px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.dust-index-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.dust-index-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dust-index-emoji {
  font-size: 28px;
  line-height: 1;
}

.dust-index-label {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

.dust-index-rating {
  display: block;
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.dust-index-score-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 200px;
}

.dust-index-score-bar {
  flex: 1;
  height: 8px;
  background: var(--color-bg);
  border-radius: 4px;
  overflow: hidden;
}

.dust-index-score-fill {
  height: 100%;
  background: linear-gradient(90deg, #52A675, #E8A838, #E06C5A, #8B5CB6);
  border-radius: 4px;
  transition: width 0.6s ease;
}

.dust-index-score-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  min-width: 30px;
  text-align: right;
}

.dust-levels {
  display: flex;
  gap: 0;
  padding: 0;
}

.dust-level-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 8px;
  border-right: 1px solid var(--color-border);
  transition: var(--transition);
  cursor: default;
}

.dust-level-item:last-child {
  border-right: none;
}

.dust-level-item:hover {
  background: var(--color-bg);
}

.dust-level-item.has-books {
  cursor: pointer;
}

.dust-level-item.has-books:hover {
  background: #FFF8F0;
}

.dust-level-emoji {
  font-size: 20px;
  line-height: 1;
  margin-bottom: 4px;
}

.dust-level-count {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.dust-level-count.zero {
  color: var(--color-text-light);
}

.dust-level-name {
  font-size: 11px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.dust-level-range {
  font-size: 10px;
  color: var(--color-text-light);
  margin-top: 1px;
}

.dust-top-book {
  padding: 14px 20px;
  background: linear-gradient(135deg, #FFF8E8, #FFF3D9);
  border-top: 1px solid var(--color-border);
}

.dust-top-book-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.dust-top-book-message {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.8;
  white-space: pre-line;
}

/* ========== 书架随机选书 ========== */
.pick-book-banner {
  margin: 0 32px 40px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

.pick-book-header {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.pick-book-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pick-book-emoji {
  font-size: 22px;
  line-height: 1;
}

.pick-book-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.pick-book-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
}

.pick-mode-select {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 13px;
  color: var(--color-text);
  background: var(--color-bg);
  outline: none;
}

.pick-book-btn {
  white-space: nowrap;
}

.pick-book-result {
  padding: 16px 20px;
  background: linear-gradient(135deg, #F0F7FF, #E8F2FD);
  border-top: 1px solid var(--color-border);
  animation: slideUp 0.3s ease;
}

.pick-book-book {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.pick-book-message {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  white-space: pre-line;
  margin-bottom: 12px;
}

.pick-book-buttons {
  display: flex;
  gap: 10px;
}

.pick-book-empty {
  padding: 16px 20px;
  background: #FFF8E8;
  border-top: 1px solid var(--color-border);
}

.pick-book-empty p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .pick-book-banner {
    margin: 12px 16px;
  }

  .pick-book-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .pick-book-btn {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .dust-index-banner {
    margin: 12px 16px;
  }

  .dust-index-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .dust-index-score-wrap {
    width: 100%;
  }

  .dust-levels {
    overflow-x: auto;
  }

  .dust-level-item {
    min-width: 70px;
  }
}

@keyframes slideDown {
  from { transform: translateY(-10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.reminder-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(232, 168, 56, 0.2);
}

.reminder-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #8A6D10;
}

.reminder-title svg {
  color: var(--color-warning);
  flex-shrink: 0;
}

.reminder-close {
  background: none;
  border: none;
  font-size: 20px;
  color: #B8A050;
  cursor: pointer;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.reminder-close:hover {
  background: rgba(232, 168, 56, 0.15);
  color: #8A6D10;
}

.reminder-body {
  padding: 8px 0;
  max-height: 320px;
  overflow-y: auto;
}

.reminder-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  transition: var(--transition);
}

.reminder-item:hover {
  background: rgba(232, 168, 56, 0.06);
}

.reminder-cover {
  width: 36px;
  height: 50px;
  border-radius: 4px;
  object-fit: cover;
  flex-shrink: 0;
  background: #F0EBE3;
}

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

.reminder-book-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reminder-meta {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

@media (max-width: 768px) {
  .reminder-banner {
    margin: 12px 16px;
  }
}

/* ========== 筛选标签 ========== */
.filter-tabs {
  display: flex;
  gap: 8px;
  padding: 16px 32px;
  overflow-x: auto;
}

.filter-tab {
  padding: 6px 16px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.filter-tab:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

.filter-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ========== 图书列表 ========== */
.main-content {
  padding: 0 32px 40px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  padding-top: 8px;
}

.book-card {
  background: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--color-border);
  position: relative;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
  border-color: var(--color-accent);
}

.book-cover {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(135deg, #F0EBE3, #E8E0D5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-cover-placeholder {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, #F0EBE3, #E8E0D5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--color-text-light);
}

.book-info {
  padding: 12px;
}

.book-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 4px;
}

.book-author {
  font-size: 12px;
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-badges {
  display: flex;
  gap: 4px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.badge-purchased { background: #E3F0FD; color: #2B7DCB; }
.badge-reading { background: #FFF3E0; color: #D4811A; }
.badge-read { background: #E0F5EC; color: #3D8B5A; }
.badge-wishlist { background: #F3E8FF; color: #8B5CB6; }
.badge-readlist { background: #FFF0E0; color: #B8732E; }
.badge-warning { background: #FFF0F0; color: #C04A3A; }

/* 积灰等级标签 */
.badge-dust-fresh { background: #E0F5EC; color: #3D8B5A; }
.badge-dust-pending { background: #E3F0FD; color: #2B7DCB; }
.badge-dust-light { background: #FFF3E0; color: #D4811A; }
.badge-dust-heavy { background: #FFF0F0; color: #C04A3A; }
.badge-dust-archaeology { background: #F3E8FF; color: #8B5CB6; }

/* 新状态标签 */
.badge-rereading { background: #F3E8FF; color: #8B5CB6; }
.badge-sold { background: #F0EBE3; color: #8C7B6B; text-decoration: line-through; }
.badge-companion { background: #FFF8E8; color: #8A6D10; }

/* 出藏图书样式 */
.book-card-sold { opacity: 0.6; }
.book-sold-flag {
  position: absolute;
  top: 8px;
  right: 8px;
  background: #8C7B6B;
  color: #fff;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

/* 积灰角标 */
.book-dust-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  backdrop-filter: blur(4px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* 详情中的积灰提示 */
.dust-info-card {
  background: linear-gradient(135deg, #FFF8E8, #FFF3D9);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 20px;
}

.dust-info-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #8A6D10;
  margin-bottom: 10px;
}

.dust-info-message {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.8;
  white-space: pre-line;
}

.dust-info-meta {
  display: flex;
  gap: 16px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(232, 168, 56, 0.2);
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* ========== 状态流转按钮 ========== */
.status-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.btn-status {
  flex: 1;
  min-width: 120px;
  justify-content: center;
  padding: 10px 16px;
  font-size: 13px;
}

/* ========== 陪伴时长卡片 ========== */
.companion-card {
  background: linear-gradient(135deg, #F0F4FF, #E8F0FE);
  border: 1px solid #B8D4F0;
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 20px;
}

.companion-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: #2B5D8F;
  margin-bottom: 8px;
}

.companion-emoji {
  font-size: 20px;
  line-height: 1;
}

.companion-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.companion-sold {
  color: #8C7B6B;
  font-weight: 600;
}

/* ========== 藏书时间线 ========== */
.timeline {
  position: relative;
  padding-left: 8px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 8px 0 8px 0;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  z-index: 1;
  border: 2px solid var(--color-card);
  box-shadow: 0 0 0 1px var(--color-border);
}

.timeline-content {
  flex: 1;
  padding-top: 4px;
}

.timeline-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.timeline-date {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.timeline-note {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 4px;
  padding: 4px 8px;
  background: var(--color-bg);
  border-radius: 4px;
}

.timeline-current .timeline-dot {
  box-shadow: 0 0 0 2px var(--color-accent), 0 2px 8px rgba(212, 165, 116, 0.3);
}

.timeline-current .timeline-label {
  color: var(--color-primary);
}

/* 已读标记 */
.book-readlist-flag {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--color-warning);
  color: #fff;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(232, 168, 56, 0.4);
}

/* ========== 空状态 ========== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
}

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

.empty-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.empty-hint {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

/* ========== 弹窗 ========== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

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

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--color-border);
}

/* ========== 表单 ========== */
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}

.required { color: var(--color-danger); }

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-card);
  outline: none;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 111, 71, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-hint {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 4px;
}

.isbn-section {
  background: #FFF8F0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.isbn-input-row {
  display: flex;
  gap: 10px;
}

.isbn-input-row .form-input { flex: 1; }

.divider {
  text-align: center;
  margin: 20px 0;
  position: relative;
  color: var(--color-text-light);
  font-size: 13px;
}

.divider::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--color-border);
}

.divider span {
  background: var(--color-card);
  padding: 0 16px;
  position: relative;
}

.purchase-section {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 20px;
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

/* ========== 警告横幅 ========== */
.warning-banner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #FFF8E8;
  border: 1px solid var(--color-warning);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-top: 16px;
  color: #8A6D10;
}

.warning-banner svg {
  flex-shrink: 0;
  color: var(--color-warning);
  margin-top: 2px;
}

.warning-banner strong {
  display: block;
  font-size: 14px;
  margin-bottom: 2px;
}

.warning-banner p {
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-line;
}

/* ========== 导入弹窗 ========== */
.import-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.import-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.import-tab {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.import-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.import-panel {
  margin-bottom: 20px;
}

.import-textarea {
  width: 100%;
  height: 200px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 13px;
  font-family: "SF Mono", "Fira Code", monospace;
  resize: vertical;
  outline: none;
  transition: var(--transition);
  margin-bottom: 12px;
}

.import-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 111, 71, 0.1);
}

.file-upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text-light);
}

.file-upload-area:hover {
  border-color: var(--color-primary);
  background: #FFF8F0;
  color: var(--color-primary);
}

.file-upload-area p {
  font-size: 14px;
  margin-top: 8px;
  font-weight: 500;
}

.file-upload-area span {
  font-size: 12px;
}

.demo-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.import-result {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
}

.import-result.success {
  background: #E0F5EC;
  color: #2D7A4F;
}

.import-result.error {
  background: #FFF0F0;
  color: #C04A3A;
}

.import-guide {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 20px;
}

.import-guide h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.import-guide ol {
  padding-left: 20px;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.import-guide a {
  color: var(--color-info);
}

.guide-note {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

/* ========== 详情弹窗 ========== */
.detail-book {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.detail-cover {
  width: 120px;
  height: 170px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  background: linear-gradient(135deg, #F0EBE3, #E8E0D5);
}

.detail-cover-placeholder {
  width: 120px;
  height: 170px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #F0EBE3, #E8E0D5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: var(--color-text-light);
  flex-shrink: 0;
}

.detail-info {
  flex: 1;
}

.detail-info h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.detail-info .detail-author {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.detail-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  font-size: 13px;
}

.detail-meta-item {
  display: flex;
  gap: 6px;
}

.detail-meta-label {
  color: var(--color-text-light);
  flex-shrink: 0;
}

.detail-meta-value {
  color: var(--color-text);
}

.detail-section {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.detail-section h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.detail-summary {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.detail-readlist-info {
  background: #FFF8E8;
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 13px;
  color: #8A6D10;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  z-index: 2000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from { transform: translate(-50%, 20px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }
.toast.warning { background: var(--color-warning); }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .header {
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 12px;
  }

  .header-center {
    order: 3;
    max-width: 100%;
    width: 100%;
  }

  .stats-bar {
    padding: 0 16px;
  }

  .stat-item {
    padding: 12px 16px;
    min-width: 72px;
  }

  .stat-num { font-size: 18px; }

  .filter-tabs, .main-content {
    padding-left: 16px;
    padding-right: 16px;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .detail-book {
    flex-direction: column;
  }

  .modal {
    max-height: 90vh;
  }
}