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

:root {
  --bg: #eceff3;
  --bg-elev: #f3f5f8;
  --card-bg: #f7f8fa;
  --card-bg-strong: #f1f3f6;
  --text: #1f2a33;
  --text-light: #5e6974;
  --accent: #2f5a68;
  --accent-dark: #244a56;
  --border: #c8d0d9;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
  --radius: 8px;
  --max-width: 1360px;
  --reading-width: 860px;
  --font-size: 17px;
  --line-height: 1.95;
  --letter-spacing: 0.02em;
  --font-family: "Georgia", "Noto Serif SC", "Source Han Serif CN", serif;
  --primary: var(--accent);
  --bg-secondary: #e2e7ed;
}

[data-theme="dark"] {
  --bg: #1b2127;
  --bg-elev: #222a31;
  --card-bg: #262f38;
  --card-bg-strong: #2b3640;
  --text: #e3e8ee;
  --text-light: #aab4bf;
  --accent: #7fb2c4;
  --accent-dark: #95c7d8;
  --border: #3a4652;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
  --bg-secondary: #323d48;
}

[data-theme="green"] {
  --bg: #dde5df;
  --bg-elev: #e8eee9;
  --card-bg: #eef3ef;
  --card-bg-strong: #e5ebe7;
  --text: #27362d;
  --text-light: #566860;
  --accent: #3f6d52;
  --accent-dark: #345b44;
  --border: #bccac0;
  --shadow: 0 1px 2px rgba(23, 44, 31, 0.1);
  --bg-secondary: #d2ddd5;
}

[data-theme="sepia"] {
  --bg: #e9e1d3;
  --bg-elev: #f0e8da;
  --card-bg: #f4ecdf;
  --card-bg-strong: #ece2d2;
  --text: #4a3f33;
  --text-light: #776553;
  --accent: #8b6848;
  --accent-dark: #735438;
  --border: #cfbea7;
  --shadow: 0 1px 2px rgba(60, 43, 26, 0.1);
  --bg-secondary: #dcccb4;
}

[data-theme="blue"] {
  --bg: #e1e7ed;
  --bg-elev: #ebf0f5;
  --card-bg: #f1f4f8;
  --card-bg-strong: #e8edf3;
  --text: #233140;
  --text-light: #5a6b7d;
  --accent: #355f84;
  --accent-dark: #2a4f6f;
  --border: #c0ccd8;
  --shadow: 0 1px 2px rgba(32, 55, 79, 0.1);
  --bg-secondary: #d6dfe8;
}

body {
  font-family: var(--font-family);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

.icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.navbar {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card-bg-strong);
  border-bottom: 1px solid var(--border);
}

.navbar h1 {
  font-size: 16px;
  font-weight: 650;
  color: var(--text);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  text-decoration: none;
}

.brand-name {
  letter-spacing: 0.01em;
}

.navbar nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 13px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 5px 8px;
}

.navbar nav a:hover {
  color: var(--accent-dark);
  border-color: var(--border);
  background: var(--card-bg);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  padding: 5px 9px;
  font-size: 12px;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.container {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 14px 16px 18px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.book-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 13px 14px;
}

.book-card:hover {
  border-color: var(--accent);
  background: var(--bg-elev);
}

.book-card h3 {
  font-size: 16px;
  margin-bottom: 5px;
  color: var(--text);
}

.book-card .meta {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 6px;
}

.book-card .desc {
  font-size: 13px;
  color: var(--text-light);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-header {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  margin-bottom: 12px;
}

.book-header h2 {
  font-size: 21px;
  margin-bottom: 6px;
}

.book-header .author {
  color: var(--text-light);
  font-size: 13px;
  margin-bottom: 8px;
}

.book-header .desc {
  color: var(--text-light);
  font-size: 14px;
  line-height: 1.65;
}

.chapter-list {
  list-style: none;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.chapter-list li {
  border-bottom: 1px solid var(--border);
}

.chapter-list li:last-child {
  border-bottom: none;
}

.chapter-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 11px 14px;
  color: var(--text);
  text-decoration: none;
}

.chapter-list a:hover {
  background: var(--bg-elev);
}

.chapter-list .chapter-title {
  font-size: 14px;
}

.chapter-list .chapter-meta {
  font-size: 12px;
  color: var(--text-light);
}

.reader {
  max-width: var(--reading-width);
  margin: 12px auto 0;
  padding: 18px 18px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.reader h2 {
  font-size: 21px;
  text-align: center;
  margin-bottom: 20px;
  color: var(--text);
}

.reader-content {
  font-size: var(--font-size);
  line-height: var(--line-height);
  color: var(--text);
  white-space: pre-wrap;
  word-wrap: break-word;
  text-indent: 2em;
  letter-spacing: var(--letter-spacing);
  text-align: justify;
}

.reader-toolbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg-strong);
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  z-index: 999;
  transition: width 0.1s;
}

.reader-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.reader-nav a,
.reader-nav span {
  color: var(--accent-dark);
  text-decoration: none;
  font-size: 13px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg-strong);
}

.reader-nav a:hover {
  border-color: var(--accent);
  background: var(--bg-elev);
}

.reader-nav .disabled {
  color: var(--text-light);
  opacity: 0.6;
  pointer-events: none;
}

.breadcrumb {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 11px;
}

.breadcrumb a {
  color: var(--accent-dark);
  text-decoration: none;
}

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

.breadcrumb span {
  margin: 0 5px;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg-strong);
  color: var(--text);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 998;
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.admin-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.section-icon {
  width: 15px;
  height: 15px;
}

#admin-panel {
  display: none;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 12px;
}

#admin-panel.is-visible {
  display: grid;
}

#admin-panel .admin-section {
  grid-column: span 6;
}

#admin-panel .admin-section.span-12 {
  grid-column: span 12;
}

.form-group {
  margin-bottom: 10px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  background: var(--bg-elev);
  color: var(--text);
}

.form-group textarea {
  min-height: 170px;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-danger {
  border-color: #9f3b34;
  background: #b04941;
}

.btn-danger:hover {
  background: #973d36;
  border-color: #973d36;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
}

.msg {
  padding: 9px 10px;
  border-radius: 6px;
  margin-top: 9px;
  font-size: 13px;
}

.msg-success {
  background: #d9e8dc;
  color: #1e4d29;
  border: 1px solid #b8d4bd;
}

.msg-error {
  background: #edd8d9;
  color: #722728;
  border: 1px solid #dfb9bb;
}

[data-theme="dark"] .msg-success {
  background: #23402d;
  color: #a9ddb5;
  border-color: #345d41;
}

[data-theme="dark"] .msg-error {
  background: #4b2a2b;
  color: #f2b7ba;
  border-color: #6b3b3d;
}

.admin-list {
  list-style: none;
}

.admin-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
}

.admin-list li:last-child {
  border-bottom: none;
}

.admin-list .item-info {
  flex: 1;
  min-width: 0;
}

.admin-list .item-title {
  font-size: 14px;
  color: var(--text);
}

.admin-list .item-meta {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 2px;
}

.admin-list .item-actions {
  display: flex;
  gap: 6px;
}

.empty {
  text-align: center;
  padding: 28px 10px;
  color: var(--text-light);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--card-bg-strong);
}

.empty p {
  font-size: 14px;
  margin-bottom: 6px;
}

.loading {
  text-align: center;
  padding: 28px 10px;
  color: var(--text-light);
}

.error-page {
  text-align: center;
  padding: 70px 16px;
}

.error-page h2 {
  font-size: 60px;
  color: var(--accent);
  margin-bottom: 10px;
}

.error-page p {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 15, 20, 0.42);
  z-index: 1000;
  display: none;
  align-items: flex-end;
  justify-content: center;
}

.settings-overlay.active {
  display: flex;
}

.settings-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  width: 100%;
  max-width: 700px;
  padding: 14px 16px 18px;
  max-height: 75vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
}

.settings-panel h3 {
  font-size: 14px;
  margin-bottom: 14px;
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.settings-panel .close-btn {
  position: absolute;
  right: 0;
  top: -2px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elev);
  width: 26px;
  height: 26px;
  color: var(--text-light);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.setting-row {
  margin-bottom: 12px;
}

.setting-label {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 6px;
  display: block;
}

.theme-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.theme-dot {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
}

.theme-dot.active {
  border: 2px solid var(--accent);
}

.theme-dot[data-theme="light"] {
  background: #eceff3;
}

.theme-dot[data-theme="dark"] {
  background: #222a31;
}

.theme-dot[data-theme="green"] {
  background: #dde5df;
}

.theme-dot[data-theme="sepia"] {
  background: #e9e1d3;
}

.theme-dot[data-theme="blue"] {
  background: #e1e7ed;
}

.font-options {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.font-option {
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text);
  background: var(--bg-elev);
}

.font-option:hover {
  border-color: var(--accent);
}

.font-option.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 9px;
}

.slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}

.slider-row .slider-val {
  font-size: 12px;
  color: var(--text-light);
  min-width: 42px;
  text-align: right;
}

.reader-bottom-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 100%);
  width: min(100%, 760px);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: var(--card-bg-strong);
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 6px 8px;
  z-index: 999;
}

.reader-bottom-bar.visible {
  transform: translate(-50%, 0);
}

.bar-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-light);
  font-size: 11px;
  padding: 4px 12px;
}

.bar-btn:hover,
.bar-btn:active {
  color: var(--accent-dark);
}

.bar-btn .bar-icon {
  width: 16px;
  height: 16px;
  display: inline-flex;
}

.bar-btn .bar-icon .icon {
  width: 16px;
  height: 16px;
}

.continue-reading {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 10px;
  background: var(--card-bg-strong);
  text-decoration: none;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}

.continue-reading:hover {
  border-color: var(--accent);
}

.continue-info {
  flex: 1;
}

.continue-info .continue-label {
  font-size: 11px;
  color: var(--text-light);
  margin-bottom: 2px;
}

.continue-info .continue-title {
  font-size: 14px;
  font-weight: 600;
}

.continue-info .continue-chapter {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 1px;
}

.continue-arrow {
  color: var(--accent-dark);
  width: 18px;
  height: 18px;
  display: inline-flex;
}

.search-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.search-bar input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  background: var(--card-bg);
  color: var(--text);
}

.search-bar input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-bar button {
  padding: 8px 12px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-size: 13px;
}

.search-bar button:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.search-results {
  margin-bottom: 10px;
}

.search-results .result-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 11px;
  margin-bottom: 6px;
  text-decoration: none;
  display: block;
  color: var(--text);
}

.search-results .result-item:hover {
  border-color: var(--accent);
}

.search-results .result-book {
  font-size: 12px;
  color: var(--text-light);
}

.search-results .result-title {
  font-size: 14px;
  margin: 3px 0;
}

.search-results .result-snippet {
  font-size: 12px;
  color: var(--text-light);
}

.search-results .result-snippet mark {
  background: rgba(47, 90, 104, 0.18);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

.toc-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 15, 20, 0.42);
  z-index: 1001;
  display: none;
  align-items: center;
  justify-content: center;
}

.toc-overlay.active {
  display: flex;
}

.toc-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: min(92%, 460px);
  max-height: 74vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.toc-panel h3 {
  padding: 11px 14px;
  margin: 0;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.toc-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  padding: 0;
  margin: 0;
}

.toc-list li a {
  display: block;
  padding: 8px 14px;
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

.toc-list li a:hover {
  background: var(--bg-elev);
}

.toc-list li a.current {
  color: var(--accent-dark);
  font-weight: 600;
}

@media (max-width: 1100px) {
  #admin-panel .admin-section {
    grid-column: span 12;
  }
}

@media (max-width: 720px) {
  .navbar {
    padding: 9px 10px;
  }

  .navbar h1 {
    font-size: 15px;
  }

  .navbar nav {
    gap: 6px;
  }

  .navbar nav a,
  .theme-toggle {
    padding: 4px 6px;
    font-size: 12px;
  }

  .container {
    padding: 10px;
  }

  .book-grid {
    grid-template-columns: 1fr;
  }

  .reader {
    margin-top: 8px;
    padding: 14px 10px 16px;
  }

  .reader-content {
    font-size: calc(var(--font-size) - 1px);
  }

  .reader-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .reader-nav a,
  .reader-nav span {
    text-align: center;
    width: 100%;
  }

  .admin-list li {
    flex-direction: column;
    align-items: flex-start;
  }

  .admin-list .item-actions {
    width: 100%;
  }

  .back-to-top {
    right: 12px;
    width: 34px;
    height: 34px;
  }

  .settings-panel {
    padding: 12px 10px 14px;
  }
}

.back-to-top.has-bar {
  bottom: 72px;
}