:root {
  --bg-color: #f2f2f2;
  --card-bg: #ffffff;
  --text-main: #1f1f1f;
  --text-sub: #666666;
  --accent: #1d4ed8;
  --border: #e5e7eb;
  --danger: #dc2626;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-color);
  color: var(--text-main);
}

.container {
  width: min(1260px, 94%);
  margin: 0 auto;
}

.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

.header-row {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.site-title {
  margin: 0;
  font-size: 24px;
}

.text-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
}

.text-link:hover {
  text-decoration: underline;
}

.page-content {
  padding: 20px 0 40px;
}

.toolbar {
  margin-bottom: 14px;
}

.field-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-sub);
}

.field-hint {
  margin: 0 0 4px;
  color: var(--text-sub);
  font-size: 13px;
}

.select-input,
.text-input,
.text-area {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 15px;
  background: #fff;
}

.period-title {
  margin: 0 0 16px;
  font-size: 28px;
}

.period-list-hint {
  margin: -8px 0 14px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.5;
}

.period-list {
  display: grid;
  gap: 12px;
}

.pagination-bar {
  margin-top: 20px;
  padding: 12px 0;
}

.pagination-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.pagination-btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.pagination-btn:hover {
  background: #eff6ff;
  text-decoration: none;
}

.pagination-btn--disabled {
  color: var(--text-sub);
  cursor: default;
  opacity: 0.65;
}

.pagination-btn--disabled:hover {
  background: var(--card-bg);
}

.pagination-meta {
  font-size: 14px;
  color: var(--text-sub);
  min-width: 7em;
  text-align: center;
}

.period-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  text-decoration: none;
  color: inherit;
}

.period-row-main {
  min-width: 0;
}

.period-row-title {
  margin: 0;
  font-size: 20px;
}

.period-row-count {
  margin: 6px 0 0;
  color: var(--text-sub);
  font-size: 14px;
}

.period-preview-list {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.period-preview-cover {
  width: 52px;
  height: 70px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #ececec;
  flex-shrink: 0;
}

.period-preview-more {
  color: var(--text-sub);
  font-size: 13px;
}

.period-row-enter {
  color: var(--accent);
  font-size: 14px;
  white-space: nowrap;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 18px;
}

.book-card {
  display: block;
  text-decoration: none;
  color: inherit;
}

.period-book-card {
  position: relative;
}

.book-tag {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.book-tag-recommend {
  background: #e0ecff;
  color: #1d4ed8;
}

.book-tag-warning {
  background: #fee2e2;
  color: #b91c1c;
}

.book-cover-wrap {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
  container-type: inline-size;
  container-name: book-cover;
  background: #ececec;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.cover-watermark {
  position: absolute;
  z-index: 5;
  width: 170%;
  text-align: center;
  padding: 6px 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.2;
  pointer-events: none;
}

.cover-watermark-warning {
  left: -34%;
  bottom: 20%;
  transform: rotate(-36deg);
  background: rgba(220, 38, 38, 0.92);
  color: #ffffff;
}

/* 精品 / 宝藏：外层斜条 + 内层反向旋转，字保持横平且贴近角，避免被圆角裁成不可读小块 */
.cover-watermark-label {
  display: inline-block;
  position: relative;
  z-index: 1;
}

.cover-watermark-premium {
  left: auto;
  right: 0;
  top: 0;
  bottom: auto;
  box-sizing: border-box;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  width: 380%;
  max-width: none;
  padding: 10px 18px 0 0;
  line-height: 1.2;
  transform: rotate(45deg);
  transform-origin: 100% 0;
  white-space: nowrap;
  background: linear-gradient(90deg, #a67c00 0%, #d4af37 38%, #f5e6a8 52%, #d4af37 78%, #a67c00 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.cover-watermark-premium .cover-watermark-label {
  position: relative;
  left: 15px;
  top: -12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: rotate(-45deg);
  transform-origin: 100% 0;
  padding: 4px 4px 2px 10px;
  color: inherit;
  text-shadow: inherit;
}

.cover-watermark-treasure {
  left: auto;
  right: 0;
  top: auto;
  bottom: 0;
  box-sizing: border-box;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  width: 380%;
  max-width: none;
  padding: 0 18px 10px 0;
  line-height: 1.2;
  transform: rotate(-45deg);
  transform-origin: 100% 100%;
  white-space: nowrap;
  background: linear-gradient(90deg, #1e3a5f 0%, #2563eb 32%, #60a5fa 52%, #2563eb 72%, #1e3a5f 100%);
  color: #f0f9ff;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
}

.cover-watermark-treasure .cover-watermark-label {
  position: relative;
  left: 10px;
  top: 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
  padding: 2px 4px 4px 10px;
  color: inherit;
  text-shadow: inherit;
}

@container book-cover (min-width: 170px) {
  .cover-watermark-premium {
    width: 460%;
  }

  .cover-watermark-treasure {
    width: 460%;
  }

  .cover-watermark-premium .cover-watermark-label,
  .cover-watermark-treasure .cover-watermark-label {
    font-size: 14px;
  }
}

/* 全部书籍 / 期内列表：封面更窄且低于 170px 容器阈值，单独加长条带并微移，减轻圆角裁字与「盖不满角」 */
.all-books-card .book-cover-wrap .cover-watermark-premium,
.period-book-card .book-cover-wrap .cover-watermark-premium {
  width: 480%;
  padding: 12px 22px 0 0;
  transform: rotate(45deg) translate(0, 5px);
  transform-origin: 100% 0;
}

.all-books-card .book-cover-wrap .cover-watermark-treasure,
.period-book-card .book-cover-wrap .cover-watermark-treasure {
  width: 480%;
  padding: 0 22px 12px 0;
  transform: rotate(-45deg) translate(0, -6px);
  transform-origin: 100% 100%;
}

.all-books-card .book-cover-wrap .cover-watermark-premium .cover-watermark-label,
.period-book-card .book-cover-wrap .cover-watermark-premium .cover-watermark-label {
  padding: 6px 6px 4px 12px;
}

.all-books-card .book-cover-wrap .cover-watermark-treasure .cover-watermark-label,
.period-book-card .book-cover-wrap .cover-watermark-treasure .cover-watermark-label {
  padding: 4px 6px 10px 12px;
}

.book-card-warning .book-cover-wrap {
  border: 2px solid #dc2626;
  box-shadow: 0 6px 18px rgba(220, 38, 38, 0.2);
}

.book-card-premium .book-cover-wrap {
  border: 2px solid #c9a227;
  box-shadow: 0 6px 20px rgba(201, 162, 39, 0.32);
}

.book-card-warning.book-card-premium .book-cover-wrap {
  border: 2px solid #c9a227;
  box-shadow: inset 0 0 0 2px #dc2626, 0 6px 20px rgba(201, 162, 39, 0.28);
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: relative;
  z-index: 0;
}

.book-name {
  margin: 10px 4px 0;
  line-height: 1.35;
  font-size: 18px;
  font-weight: 700;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.empty-state {
  color: var(--text-sub);
  font-size: 14px;
}

.hidden {
  display: none !important;
}

.detail-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}

.detail-head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.detail-head-info {
  min-width: 0;
}

.detail-cover {
  width: min(220px, 100%);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 14px;
  background: #ececec;
  display: block;
  position: relative;
  z-index: 0;
}

.detail-cover-wrap {
  width: min(220px, 100%);
  flex-shrink: 0;
}

.detail-cover-wrap.is-warning {
  border: 2px solid #dc2626;
  box-shadow: 0 6px 18px rgba(220, 38, 38, 0.2);
}

.detail-cover-wrap.is-premium {
  border: 2px solid #c9a227;
  box-shadow: 0 6px 20px rgba(201, 162, 39, 0.32);
}

.detail-cover-wrap.is-warning.is-premium {
  border: 2px solid #c9a227;
  box-shadow: inset 0 0 0 2px #dc2626, 0 6px 20px rgba(201, 162, 39, 0.28);
}

.detail-title {
  margin: 0;
  font-size: 30px;
}

.detail-meta {
  margin-top: 12px;
  display: grid;
  gap: 6px;
}

.detail-meta-item {
  margin: 0;
  color: var(--text-sub);
  font-size: 15px;
}

.detail-meta-main {
  color: #111111;
  font-size: 16px;
}

.detail-intro-block {
  margin-top: 10px;
}

.detail-intro-clip {
  min-width: 0;
}

.detail-intro-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-sub);
  white-space: pre-wrap;
}

.detail-intro-toggle {
  margin: 6px 0 0;
  padding: 0;
  border: none;
  background: none;
  font: inherit;
  font-size: 12px;
  color: var(--text-sub);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.detail-intro-toggle:hover {
  color: #111111;
}

.meta-gap {
  display: inline-block;
  width: 18px;
}

.detail-rating-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  margin-top: 16px;
  padding: 10px 14px;
  border-radius: 10px;
  background: #e8f0fe;
  border: 1px solid #c7d7f6;
}

.detail-rating-wrap.is-warning {
  background: #fef2f2;
  border-color: #fecaca;
}

.detail-rating-label {
  font-size: 14px;
  color: var(--text-sub);
}

.detail-rating-value {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: #1d4ed8;
}

.detail-rating-wrap.is-warning .detail-rating-value {
  color: #b91c1c;
}

.detail-rating-suffix {
  font-size: 14px;
  color: var(--text-sub);
}

.detail-section {
  margin-top: 18px;
}

.section-title {
  margin: 0 0 8px;
  font-size: 20px;
}

.detail-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.admin-checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0 0 12px;
}

.admin-checkbox-label {
  font-size: 14px;
  line-height: 1.4;
  cursor: pointer;
}

.admin-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
}

.panel-title {
  margin: 0 0 14px;
  font-size: 20px;
}

.inline-form {
  margin-bottom: 14px;
}

.stack-form {
  display: grid;
  gap: 8px;
}

.button-row {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

.primary-button,
.secondary-button,
.danger-button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
}

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

.secondary-button {
  background: #e5e7eb;
  color: #111827;
}

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

.admin-book-list {
  display: grid;
  gap: 10px;
}

.cover-preview {
  width: 120px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #ececec;
}

.admin-book-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.admin-book-main {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.admin-book-text {
  flex: 1;
  min-width: 0;
}

.admin-book-tags {
  margin: 6px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.admin-book-tag {
  display: inline-block;
  font-size: 12px;
  line-height: 1.3;
  padding: 2px 7px;
  border-radius: 999px;
  background: #eef2ff;
  color: #4338ca;
  border: 1px solid #c7d2fe;
}

.admin-thumb {
  width: 58px;
  height: 78px;
  border-radius: 8px;
  object-fit: cover;
  background: #ececec;
  flex-shrink: 0;
}

.admin-book-title {
  margin: 0;
  font-size: 16px;
}

.admin-actions {
  display: flex;
  gap: 8px;
}

.period-detail-grid {
  margin-top: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.period-detail-grid .period-book-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.period-detail-grid .period-book-card .book-cover-wrap {
  width: 140px;
  flex-shrink: 0;
}

.period-book-left {
  width: 140px;
  flex-shrink: 0;
}

.period-book-content {
  min-width: 0;
  flex: 1;
}

.period-book-name {
  margin: 8px 4px 0;
  font-size: 15px;
  font-weight: 400;
}

.period-book-summary {
  margin: 1.7em 0 0;
  color: #111111;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.7;
  text-indent: 2em;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 5;
  overflow: hidden;
  white-space: pre-wrap;
}

.period-books-section {
  margin-top: 16px;
}

.period-section-title {
  margin: 0;
  font-size: 20px;
}

.warning-title {
  color: #b91c1c;
}

.all-books-intro {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.55;
}

.all-books-toolbar {
  margin: 0 0 16px;
}

.all-books-search-input {
  width: 100%;
  max-width: 420px;
}

.book-keyword-tag {
  display: inline-block;
  font-size: 12px;
  line-height: 1.35;
  padding: 3px 8px;
  border-radius: 999px;
  background: #f3f4f6;
  color: var(--text-sub);
  border: 1px solid var(--border);
}

.all-books-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 6px 4px 0;
}

.detail-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 4px;
}

.all-books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 18px;
}

.all-books-card {
  display: block;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s ease;
}

.all-books-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.all-books-card-warning .book-cover-wrap {
  border: 2px solid #dc2626;
  box-shadow: 0 6px 18px rgba(220, 38, 38, 0.15);
}

.all-books-card-premium .book-cover-wrap {
  border: 2px solid #c9a227;
  box-shadow: 0 6px 20px rgba(201, 162, 39, 0.3);
}

.all-books-card-warning.all-books-card-premium .book-cover-wrap {
  border: 2px solid #c9a227;
  box-shadow: inset 0 0 0 2px #dc2626, 0 6px 20px rgba(201, 162, 39, 0.26);
}

.all-books-card-rating {
  margin: 8px 4px 0;
  font-size: 14px;
  color: var(--text-sub);
}

.all-books-rating-num {
  font-weight: 700;
  color: var(--text-main);
  font-size: 18px;
}

.all-books-rating-suffix {
  font-size: 13px;
  color: var(--text-sub);
}

.all-books-card-meta {
  margin: 6px 4px 0;
  font-size: 13px;
  color: var(--text-sub);
}

.breadcrumb-row {
  margin: 0 0 12px;
}

.book-title-timeline-hint {
  margin: -8px 0 16px;
  font-size: 13px;
  color: var(--text-sub);
}

.book-title-timeline {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.book-mention-card {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
}

.book-mention-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.book-mention-period-title {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.book-mention-summary {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-sub);
}

.book-mention-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
}

@media (max-width: 768px) {
  .site-title {
    font-size: 20px;
  }

  .period-title {
    font-size: 24px;
  }

  .period-row {
    align-items: flex-start;
  }

  .period-row-title {
    font-size: 18px;
  }

  .period-row-enter {
    font-size: 13px;
  }

  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .period-detail-grid {
    grid-template-columns: 1fr;
  }

  .book-name {
    font-size: 16px;
  }

  .detail-title {
    font-size: 24px;
  }

  .detail-head {
    flex-direction: column;
    gap: 12px;
  }

  .detail-meta {
    margin-top: 8px;
  }

  .all-books-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}