:root {
  --bg-start: #fff8f8;
  --bg-mid: #fbebed;
  --bg-end: #f6d8de;
  --paper: #fff7f8;
  --panel: #fff9fa;
  --panel-soft: #fceff1;
  --panel-hover: #f8e0e5;
  --line: #d8b5be;
  --ink: #44262e;
  --subtle: #7a4c56;
  --scroll-track: #f8e9ec;
  --scroll-thumb: #d39ba8;
  --chapter-border: #ebd2d8;
  --chapter-active-bg: #f8e2e6;
  --chapter-active-border: #dfb8c2;
  --chapter-hover-bg: #fae9ec;
  --reader-progress-bg: #faecef;
  --viewer-bg: #fff8fa;
  --accent: #fbdee0;
  --accent-strong: #f0b8c0;
  --accent-text: #5a2e36;
  --dark-bg-start: #25161a;
  --dark-bg-mid: #1d1114;
  --dark-bg-end: #160c0e;
  --dark-panel: #201316;
  --dark-panel-soft: #2a1a1f;
  --dark-line: #6a424d;
  --dark-ink: #fff7fa;
  --dark-subtle: #f0dbe2;
  --dark-scroll-track: #2a1a1f;
  --dark-scroll-thumb: #8f5f6c;
  --dark-chapter-border: #563741;
  --dark-chapter-active-bg: #3a242b;
  --dark-chapter-active-border: #7c505d;
  --dark-chapter-hover-bg: #322027;
  --dark-reader-progress-bg: #2a1a1f;
  --dark-viewer-bg: #1b1013;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  font-family: "IBM Plex Sans", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 0% 0%, var(--bg-start) 0%, var(--bg-mid) 44%, var(--bg-end) 100%);
}

input,
button {
  font: inherit;
}

button {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--accent-text);
  background: var(--accent);
  cursor: pointer;
}

button:hover {
  background: var(--accent-strong);
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(26, 16, 20, 0.38);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.menu-drawer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: min(380px, 92vw);
  height: 100vh;
  background: var(--paper);
  border-right: 1px solid var(--line);
  box-shadow: 24px 0 50px rgba(0, 0, 0, 0.2);
  transform: translateX(-100%);
  transition: transform 220ms ease;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px;
}

.menu-drawer.open {
  transform: translateX(0);
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.drawer-head h2 {
  margin: 0;
  font-size: 18px;
}

.user-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--subtle);
}

.user-box input,
.upload-form input[type="text"],
.upload-form input[type="file"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 8px;
}

.upload-form input[type="file"]::file-selector-button {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 6px 10px;
  margin-right: 10px;
  color: var(--accent-text);
  background: var(--accent);
  cursor: pointer;
}

.upload-form input[type="file"]::-webkit-file-upload-button {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 6px 10px;
  margin-right: 10px;
  color: var(--accent-text);
  background: var(--accent);
  cursor: pointer;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-soft);
}

.upload-form h3 {
  margin: 0;
  font-size: 14px;
}

.library-tabs {
  min-height: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tab-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--panel-soft);
  color: var(--ink);
  border-color: var(--line);
}

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

.tab-btn.active {
  background: var(--accent);
  color: var(--accent-text);
}

.tab-panel {
  display: none;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  gap: 10px;
}

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

.settings-panel {
  overflow-y: auto;
  padding-right: 2px;
}

.books-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.books-head h3 {
  margin: 0;
  font-size: 14px;
}

.books-head button {
  padding: 6px 10px;
  font-size: 12px;
}

.scroll-list {
  margin: 0;
  padding: 8px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

.scroll-list::-webkit-scrollbar {
  width: 10px;
}

.scroll-list::-webkit-scrollbar-track {
  background: var(--scroll-track);
  border-radius: 999px;
}

.scroll-list::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 999px;
  border: 2px solid var(--scroll-track);
}

.book-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
}

.book-title {
  font-weight: 600;
}

.book-meta {
  color: var(--subtle);
  font-size: 13px;
}

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

.book-actions button {
  font-size: 12px;
  padding: 6px 8px;
}

.book-actions .delete {
  background: #c43a62;
  color: #fff;
  border-color: #a73052;
  font-weight: 600;
}

.book-actions .delete:hover {
  background: #a73052;
  color: #fff;
  border-color: #8f2847;
}

.chapter-item {
  border-bottom: 1px dashed var(--chapter-border);
  padding-bottom: 6px;
}

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

.chapter-item.active .chapter-link {
  background: var(--chapter-active-bg);
  border-color: var(--chapter-active-border);
}

.chapter-link {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  text-align: left;
  padding: 8px 10px;
}

.chapter-link:hover {
  background: var(--chapter-hover-bg);
}

.empty-item {
  color: var(--subtle);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
  background: var(--panel-soft);
}

.reader-shell {
  padding: 14px 16px;
  min-height: 100vh;
}

.reader {
  max-width: 980px;
  height: calc(100vh - 66px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.reader-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  grid-template-areas: "menu title tools actions";
  align-items: center;
  gap: 10px;
}

.reader-head .menu-toggle {
  grid-area: menu;
}

.reader-head h2 {
  grid-area: title;
  margin: 0;
  min-width: 0;
  font-size: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-tools {
  grid-area: tools;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-progress {
  font-size: 12px;
  color: var(--subtle);
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--reader-progress-bg);
  padding: 4px 8px;
  white-space: nowrap;
}

.quick-theme-toggle {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, #ffe4a8 0%, #ffc76d 48%, #425a8f 52%, #28354f 100%);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.5);
}

.quick-theme-toggle:hover {
  filter: brightness(1.05);
  background: linear-gradient(135deg, #ffe4a8 0%, #ffc76d 48%, #425a8f 52%, #28354f 100%);
}

.reader-actions {
  grid-area: actions;
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.reader-actions button {
  background: #c43a62;
  color: #fff;
  border-color: #a73052;
  box-shadow: 0 6px 14px rgba(167, 48, 82, 0.24);
}

.reader-actions button:hover {
  background: #a73052;
  border-color: #8f2847;
}

.reader-actions button:disabled {
  background: #e7c2cb;
  color: #8a5b67;
  border-color: #d9a8b4;
  box-shadow: none;
  cursor: not-allowed;
}

#viewer {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--viewer-bg);
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

#viewer iframe,
#viewer .epub-container,
#viewer .epub-view {
  background: inherit;
}

.txt-reader {
  min-height: 100%;
  padding: 28px clamp(18px, 3vw, 42px) 36px;
  color: inherit;
  font-family: "Iowan Old Style", "PingFang SC", "Noto Serif CJK SC", serif;
  font-size: 18px;
  line-height: 1.95;
  letter-spacing: 0.01em;
}

.txt-section + .txt-section {
  margin-top: 2.6rem;
  padding-top: 2rem;
  border-top: 1px dashed var(--chapter-border);
}

.txt-section-title {
  margin: 0 0 1.2rem;
  font-size: 1.18rem;
  line-height: 1.45;
}

.txt-paragraph {
  margin: 0 0 1.1em;
  white-space: pre-wrap;
  word-break: break-word;
}

#viewer::-webkit-scrollbar,
#viewer .epub-container::-webkit-scrollbar {
  width: 10px;
}

#viewer::-webkit-scrollbar-track,
#viewer .epub-container::-webkit-scrollbar-track {
  background: var(--scroll-track);
  border-radius: 999px;
}

#viewer::-webkit-scrollbar-thumb,
#viewer .epub-container::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 999px;
  border: 2px solid var(--scroll-track);
}

@media (max-width: 980px) {
  .reader {
    height: calc(100vh - 72px);
  }
}

@media (max-width: 760px) {
  .menu-drawer {
    width: 100vw;
    height: 100dvh;
    padding: 12px;
    border-right: none;
  }

  .drawer-head h2 {
    font-size: 16px;
  }

  .tab-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tab-btn {
    width: 100%;
    padding: 7px 6px;
    font-size: 13px;
  }

  .books-head h3 {
    font-size: 13px;
  }

  .reader-shell {
    padding: calc(10px + env(safe-area-inset-top)) 10px calc(74px + env(safe-area-inset-bottom));
  }

  .reader {
    height: calc(100dvh - 66px - env(safe-area-inset-bottom));
    gap: 6px;
  }

  .reader-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas: "menu title tools";
    gap: 8px;
    padding: 0;
  }

  .reader-head h2 {
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
  }

  .reader-tools {
    justify-self: end;
  }

  .reader-progress {
    font-size: 11px;
    padding: 3px 7px;
  }

  .quick-theme-toggle {
    width: 32px;
    height: 32px;
  }

  .reader-actions {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    width: auto;
    z-index: 35;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .reader-actions button {
    width: 100%;
    padding: 8px 6px;
    font-size: 13px;
  }

  #viewer {
    border-radius: 10px;
  }

  .book-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .book-actions button {
    width: 100%;
  }

}

body[data-theme="dark"] {
  color: var(--dark-ink);
  background: radial-gradient(circle at 0% 0%, var(--dark-bg-start) 0%, var(--dark-bg-mid) 42%, var(--dark-bg-end) 100%);
}

body[data-theme="dark"] .drawer-backdrop {
  background: rgba(6, 4, 5, 0.55);
}

body[data-theme="dark"] .menu-drawer {
  background: var(--dark-panel);
  border-right-color: var(--dark-line);
  box-shadow: 24px 0 56px rgba(0, 0, 0, 0.45);
}

body[data-theme="dark"] .user-box {
  color: var(--dark-subtle);
}

body[data-theme="dark"] .user-box input,
body[data-theme="dark"] .upload-form input[type="text"],
body[data-theme="dark"] .upload-form input[type="file"] {
  background: var(--dark-panel-soft);
  color: var(--dark-ink);
  border-color: var(--dark-line);
}

body[data-theme="dark"] .upload-form input[type="file"]::file-selector-button {
  background: var(--accent);
  color: var(--accent-text);
  border-color: transparent;
}

body[data-theme="dark"] .upload-form input[type="file"]::-webkit-file-upload-button {
  background: var(--accent);
  color: var(--accent-text);
  border-color: transparent;
}

body[data-theme="dark"] .upload-form {
  background: var(--dark-panel-soft);
  border-color: var(--dark-line);
}

body[data-theme="dark"] .tab-btn {
  background: var(--dark-panel-soft);
  color: var(--dark-ink);
  border-color: var(--dark-line);
}

body[data-theme="dark"] .tab-btn:hover {
  background: var(--dark-chapter-hover-bg);
}

body[data-theme="dark"] .scroll-list {
  background: var(--dark-viewer-bg);
  border-color: var(--dark-line);
  scrollbar-color: var(--dark-scroll-thumb) var(--dark-scroll-track);
}

body[data-theme="dark"] .scroll-list::-webkit-scrollbar-track {
  background: var(--dark-scroll-track);
}

body[data-theme="dark"] .scroll-list::-webkit-scrollbar-thumb {
  background: var(--dark-scroll-thumb);
  border-color: var(--dark-scroll-track);
}

body[data-theme="dark"] .book-item {
  background: var(--dark-panel);
  border-color: var(--dark-line);
}

body[data-theme="dark"] .book-meta,
body[data-theme="dark"] .empty-item {
  color: var(--dark-subtle);
}

body[data-theme="dark"] .chapter-item {
  border-bottom-color: var(--dark-chapter-border);
}

body[data-theme="dark"] .chapter-item.active .chapter-link {
  background: var(--dark-chapter-active-bg);
  border-color: var(--dark-chapter-active-border);
}

body[data-theme="dark"] .chapter-link {
  color: var(--dark-ink);
}

body[data-theme="dark"] .chapter-link:hover {
  background: var(--dark-chapter-hover-bg);
}

body[data-theme="dark"] .empty-item {
  background: var(--dark-panel-soft);
  border-color: var(--dark-line);
}

body[data-theme="dark"] .quick-theme-toggle {
  border-color: var(--dark-line);
  box-shadow: inset 0 0 0 2px rgba(32, 19, 22, 0.7);
}

body[data-theme="dark"] .reader-progress {
  color: var(--dark-subtle);
  border-color: var(--dark-line);
  background: var(--dark-reader-progress-bg);
}

body[data-theme="dark"] .reader-actions button:disabled {
  background: #5a3340;
  color: #caa6b0;
  border-color: #7a4b5a;
}

body[data-theme="dark"] #viewer {
  background: var(--dark-viewer-bg);
  border-color: var(--dark-line);
  scrollbar-color: var(--dark-scroll-thumb) var(--dark-scroll-track);
}

body[data-theme="dark"] #viewer iframe,
body[data-theme="dark"] #viewer .epub-container,
body[data-theme="dark"] #viewer .epub-view {
  background: var(--dark-viewer-bg);
}

body[data-theme="dark"] .txt-section + .txt-section {
  border-top-color: var(--dark-chapter-border);
}

body[data-theme="dark"] #viewer::-webkit-scrollbar-track,
body[data-theme="dark"] #viewer .epub-container::-webkit-scrollbar-track {
  background: var(--dark-scroll-track);
}

body[data-theme="dark"] #viewer::-webkit-scrollbar-thumb,
body[data-theme="dark"] #viewer .epub-container::-webkit-scrollbar-thumb {
  background: var(--dark-scroll-thumb);
  border-color: var(--dark-scroll-track);
}