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

:root {
  --bg: #f0efe9;
  --card-bg: #ffffff;
  --text: #2c2c2c;
  --text-secondary: #7a7a7a;
  --text-muted: #b0b0b0;
  --border: #e8e6e1;
  --primary: #5B8C85;
  --primary-hover: #4a7a73;
  --primary-light: rgba(91,140,133,0.08);
  --danger: #c0392b;
  --success: #27ae60;
  --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --radius: 8px;
  --radius-lg: 12px;
}

body.dark {
  --bg: #141414;
  --card-bg: #1e1e1e;
  --text: #d8d8d8;
  --text-secondary: #888;
  --text-muted: #555;
  --border: #2a2a2a;
  --primary: #6da8a1;
  --primary-hover: #5B9C95;
  --primary-light: rgba(109,168,161,0.1);
  --shadow: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.35);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* === Header === */
.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 2px;
}

.header-nav {
  display: flex;
  gap: 4px;
}

.header-nav a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--primary);
  background: var(--primary-light);
}

.header-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

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

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

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

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.15s;
}

.btn-icon:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* === Toolbar === */
.toolbar {
  display: flex;
  gap: 10px;
  padding: 16px 24px;
  align-items: center;
}

.search-box {
  flex: 1;
  min-width: 0;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.search-box:focus {
  border-color: var(--primary);
}

.search-box::placeholder {
  color: var(--text-muted);
}

select {
  height: 38px;
  padding: 0 28px 0 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%237a7a7a' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

/* === Book Grid === */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  padding: 0 24px 32px;
}

.book-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.book-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.book-cover {
  aspect-ratio: 3/4;
  overflow: hidden;
  position: relative;
}

.book-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.book-cover-placeholder .cover-title {
  color: rgba(255,255,255,0.9);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  line-height: 1.4;
  word-break: break-all;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.book-info {
  padding: 12px;
}

.book-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.book-author {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-meta {
  display: flex;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
  align-items: center;
}

.book-meta .tag {
  background: var(--primary-light);
  color: var(--primary);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 10px;
}

.btn-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  line-height: 1;
  backdrop-filter: blur(4px);
}

.book-card:hover .btn-delete {
  display: flex;
}

/* === Pagination === */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 8px 24px 32px;
}

.pagination button {
  height: 36px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination button:not(:disabled):hover {
  border-color: var(--primary);
  color: var(--primary);
}

#pageInfo {
  font-size: 13px;
  color: var(--text-secondary);
}

/* === Empty & Loading === */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.empty-state p {
  font-size: 14px;
  margin-top: 8px;
}

.empty-state .icon {
  font-size: 40px;
  color: var(--border);
  margin-bottom: 12px;
}

/* === Modal === */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 90%;
  max-width: 360px;
  box-shadow: var(--shadow-lg);
}

.modal h2 {
  margin-bottom: 20px;
  font-size: 16px;
  font-weight: 600;
}

.modal input[type="password"],
.modal input[type="text"] {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  margin-bottom: 8px;
}

.modal input:focus {
  border-color: var(--primary);
}

.modal-error {
  color: var(--danger);
  font-size: 12px;
  min-height: 18px;
  margin-bottom: 4px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.modal-actions .btn {
  flex: 1;
  height: 38px;
}

/* === Upload Page === */
.page-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 24px;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 24px;
}

.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.15s;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.form-group {
  margin-bottom: 18px;
}

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

.form-input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.form-input:focus {
  border-color: var(--primary);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 16px;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.drop-zone p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 4px;
}

.drop-zone .sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.status-msg {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  margin-top: 12px;
}

.status-msg.success {
  background: rgba(39,174,96,0.08);
  color: var(--success);
}

.status-msg.error {
  background: rgba(192,57,43,0.08);
  color: var(--danger);
}

/* === Gutenberg === */
.gutenberg-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  background: var(--card-bg);
  gap: 12px;
}

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

.gutenberg-info h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.gutenberg-info p {
  font-size: 12px;
  color: var(--text-secondary);
}

.gutenberg-info .meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* === Login === */
.login-box {
  max-width: 340px;
  margin: 100px auto;
  padding: 36px 32px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.login-box h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
}

.login-box .form-input {
  text-align: center;
  margin-bottom: 12px;
}

.login-box .btn {
  width: 100%;
  height: 42px;
}

/* === Reader === */
.reader-topbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.reader-topbar-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 0;
}

.reader-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 12px;
}

.reader-title-row h2 {
  font-size: 15px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.reader-title-row .author {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.reader-toolbar {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.reader-toolbar .sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.reader-toolbar label {
  font-size: 12px;
  color: var(--text-muted);
}

.reader-toolbar .val {
  font-size: 12px;
  color: var(--text-secondary);
  min-width: 22px;
  text-align: center;
}

.progress-track {
  height: 2px;
  background: var(--border);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s;
}

/* 收缩按钮 - 与顶部栏同级，固定在顶部中央 */
.topbar-toggle-btn {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 22px;
  border: none;
  border-radius: 0 0 10px 10px;
  background: var(--card-bg);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 15;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  transition: color 0.15s, background 0.15s;
  padding: 0;
}

.topbar-toggle-btn:hover {
  color: var(--primary);
}

body.dark .topbar-toggle-btn {
  background: var(--card-bg);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

/* 浮动控制栏 */
.float-controls {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 50;
}

.float-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all 0.15s;
}

.float-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Chapter sidebar */
.reader-layout {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  min-height: calc(100vh - 120px);
}

.chapter-sidebar {
  width: 260px;
  border-right: 1px solid var(--border);
  background: var(--card-bg);
  overflow-y: auto;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
}

.chapter-sidebar-header {
  padding: 14px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--card-bg);
  z-index: 1;
}

.chapter-list {
  padding: 8px 0;
}

.chapter-item {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
  border-left: 2px solid transparent;
}

.chapter-item:hover {
  background: var(--primary-light);
  color: var(--text);
}

.chapter-item.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: var(--primary-light);
  font-weight: 500;
}

.reader-main {
  flex: 1;
  min-width: 0;
}

.reader-content {
  padding: 32px 40px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 17px;
  line-height: 1.9;
  max-width: 780px;
  margin: 0 auto;
  min-height: 60vh;
}

.reader-bottom-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 20px;
  max-width: 780px;
  margin: 0 auto;
}

.reader-bottom-nav .btn {
  min-width: 100px;
  height: 40px;
}

.reader-bottom-nav .page-info {
  font-size: 13px;
  color: var(--text-secondary);
  min-width: 80px;
  text-align: center;
}

/* Theme buttons */
.theme-dots {
  display: flex;
  gap: 6px;
  align-items: center;
}

.theme-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s;
}

.theme-dot:hover,
.theme-dot.active {
  border-color: var(--primary);
}

/* Chapter toggle (mobile) */
.chapter-toggle {
  display: none;
}

/* 目录遮罩层 */
.chapter-backdrop {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 140;
}

.chapter-backdrop.open {
  display: block;
}

/* 目录关闭按钮 */
.chapter-close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  display: none;
  align-items: center;
  justify-content: center;
}

/* 移动端目录浮动按钮 */
.chapter-float-btn {
  display: none;
}

/* === Responsive === */
@media (max-width: 900px) {
  .chapter-sidebar {
    display: none;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 280px;
    z-index: 150;
    box-shadow: var(--shadow-lg);
    border-right: 1px solid var(--border);
  }

  .chapter-sidebar.open {
    display: flex;
    flex-direction: column;
  }

  .chapter-sidebar .chapter-list {
    flex: 1;
    overflow-y: auto;
  }

  .chapter-close-btn {
    display: flex;
  }

  .chapter-toggle {
    display: none;
  }

  .chapter-float-btn {
    display: flex;
  }

  .reader-content {
    padding: 24px 20px;
  }
}

@media (max-width: 640px) {
  .header {
    padding: 0 16px;
  }

  .header-nav {
    display: none;
  }

  .toolbar {
    padding: 12px 16px;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
    padding: 0 16px 24px;
  }

  .book-info {
    padding: 10px;
  }

  .book-title {
    font-size: 12px;
  }

  .page-container {
    padding: 24px 16px;
  }

  .reader-content {
    font-size: 16px;
    padding: 20px 16px;
  }
}

@media (max-width: 380px) {
  .book-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
}

/* === Dark mode 覆盖阅读器和浮动元素 === */
body.dark .reader-topbar {
  background: var(--card-bg);
}

body.dark .reader-content {
  background-color: #1e1e1e;
  color: #c8c8c8;
}

body.dark .chapter-sidebar {
  background: var(--card-bg);
}

body.dark .chapter-sidebar-header {
  background: var(--card-bg);
}

body.dark .chapter-close-btn {
  color: var(--text-secondary);
}

body.dark .reader-bottom-nav {
  background: var(--card-bg);
}

body.dark .float-btn {
  background: var(--card-bg);
  border-color: var(--border);
  color: var(--text-secondary);
}

body.dark .float-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

body.dark select {
  background-color: var(--card-bg);
  color: var(--text);
}

body.dark input,
body.dark .form-input,
body.dark .search-box {
  background-color: var(--card-bg);
  color: var(--text);
}

body.dark .drop-zone {
  background: transparent;
}

body.dark .login-box {
  background: var(--card-bg);
}

body.dark .modal {
  background: var(--card-bg);
}