:root {
  --bg: #eef3ea;
  --paper: #fbfdf9;
  --line: #d4dfd2;
  --ink: #1f3129;
  --subtle: #607167;
  --accent: #117a65;
  --accent-strong: #0f6b59;
}

* {
  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%, #fcfdf9 0%, var(--bg) 44%, #e5efe1 100%);
}

input,
button {
  font: inherit;
}

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

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

.menu-toggle {
  position: static;
  box-shadow: 0 8px 24px rgba(12, 42, 34, 0.18);
  flex-shrink: 0;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(17, 26, 22, 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(20, 43, 36, 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: #fff;
  padding: 8px;
}

.upload-form input[type="file"]::file-selector-button {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 6px 10px;
  margin-right: 10px;
  color: #fff;
  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: #fff;
  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: #f7fbf6;
}

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

.reader-style-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7fbf6;
}

.reader-style-panel h3 {
  margin: 0;
  font-size: 14px;
}

.style-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.style-grid label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--subtle);
}

.style-grid input[type="range"],
.style-grid input[type="color"],
.style-grid select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 6px;
}

.style-grid input[type="color"] {
  height: 36px;
  padding: 4px;
}

.reader-style-panel button {
  margin-top: 2px;
}

.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: #e7f0ea;
  color: var(--ink);
  border-color: var(--line);
}

.tab-btn:hover {
  background: #dce9e1;
}

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

.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: #fdfefc;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: #9eb4a7 #eff5ef;
}

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

.scroll-list::-webkit-scrollbar-track {
  background: #eff5ef;
  border-radius: 999px;
}

.scroll-list::-webkit-scrollbar-thumb {
  background: #9eb4a7;
  border-radius: 999px;
  border: 2px solid #eff5ef;
}

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

.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: #c34747;
}

.book-actions .delete:hover {
  background: #a73939;
}

.chapter-item {
  border-bottom: 1px dashed #d8e4d6;
  padding-bottom: 6px;
}

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

.chapter-item.active .chapter-link {
  background: #dff0e8;
  border-color: #bfdccf;
}

.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: #ebf3ed;
}

.empty-item {
  color: var(--subtle);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fbfdf9;
}

.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;
}

.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:disabled {
  background: #b8c9bf;
  cursor: not-allowed;
}

#viewer {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  overflow: hidden;
  scrollbar-width: thin;
  scrollbar-color: #9eb4a7 #eff5ef;
}

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

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

#viewer::-webkit-scrollbar-track,
#viewer .epub-container::-webkit-scrollbar-track {
  background: #eff5ef;
  border-radius: 999px;
}

#viewer::-webkit-scrollbar-thumb,
#viewer .epub-container::-webkit-scrollbar-thumb {
  background: #9eb4a7;
  border-radius: 999px;
  border: 2px solid #eff5ef;
}

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

@media (max-width: 760px) {
  .menu-toggle {
    padding: 7px 10px;
    font-size: 13px;
  }

  .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;
  }

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

  .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;
  }

  .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: #d4e4dc;
  background: radial-gradient(circle at 0% 0%, #1c2623 0%, #111917 42%, #0b1110 100%);
}

body[data-theme="dark"] .menu-toggle {
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.45);
}

body[data-theme="dark"] .drawer-backdrop {
  background: rgba(4, 8, 7, 0.55);
}

body[data-theme="dark"] .menu-drawer {
  background: #121c19;
  border-right-color: #2b3b35;
  box-shadow: 24px 0 56px rgba(0, 0, 0, 0.45);
}

body[data-theme="dark"] .user-box {
  color: #99b2a7;
}

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: #0e1513;
  color: #d4e4dc;
  border-color: #30423b;
}

body[data-theme="dark"] .upload-form input[type="file"]::file-selector-button {
  background: #2d4e44;
  color: #dff3ea;
  border-color: #3f6358;
}

body[data-theme="dark"] .upload-form input[type="file"]::-webkit-file-upload-button {
  background: #2d4e44;
  color: #dff3ea;
  border-color: #3f6358;
}

body[data-theme="dark"] .upload-form {
  background: #172420;
  border-color: #2f4039;
}

body[data-theme="dark"] .reader-style-panel {
  background: #172420;
  border-color: #2f4039;
}

body[data-theme="dark"] .tab-btn {
  background: #1b2c27;
  color: #c5d8d0;
  border-color: #33463f;
}

body[data-theme="dark"] .tab-btn:hover {
  background: #233831;
}

body[data-theme="dark"] .scroll-list {
  background: #0f1715;
  border-color: #2f4039;
  scrollbar-color: #4d6a60 #172420;
}

body[data-theme="dark"] .scroll-list::-webkit-scrollbar-track {
  background: #172420;
}

body[data-theme="dark"] .scroll-list::-webkit-scrollbar-thumb {
  background: #4d6a60;
  border-color: #172420;
}

body[data-theme="dark"] .style-grid label {
  color: #99b2a7;
}

body[data-theme="dark"] .style-grid input[type="range"],
body[data-theme="dark"] .style-grid input[type="color"],
body[data-theme="dark"] .style-grid select {
  background: #0e1513;
  color: #d4e4dc;
  border-color: #30423b;
}

body[data-theme="dark"] .book-item {
  background: #192622;
  border-color: #31433c;
}

body[data-theme="dark"] .book-meta,
body[data-theme="dark"] .empty-item {
  color: #97afa5;
}

body[data-theme="dark"] .chapter-item {
  border-bottom-color: #2d3f38;
}

body[data-theme="dark"] .chapter-item.active .chapter-link {
  background: #2a4038;
  border-color: #48675d;
}

body[data-theme="dark"] .chapter-link {
  color: #d1e0d9;
}

body[data-theme="dark"] .chapter-link:hover {
  background: #1f312c;
}

body[data-theme="dark"] .empty-item {
  background: #15211d;
  border-color: #33473f;
}

body[data-theme="dark"] .quick-theme-toggle {
  border-color: #3a4e46;
  box-shadow: inset 0 0 0 2px rgba(18, 28, 25, 0.7);
}

body[data-theme="dark"] #viewer {
  background: #0f1715;
  border-color: #2f4039;
  scrollbar-color: #4d6a60 #172420;
}

body[data-theme="dark"] #viewer iframe,
body[data-theme="dark"] #viewer .epub-container,
body[data-theme="dark"] #viewer .epub-view {
  background: #0f1715;
}

body[data-theme="dark"] #viewer::-webkit-scrollbar-track,
body[data-theme="dark"] #viewer .epub-container::-webkit-scrollbar-track {
  background: #172420;
}

body[data-theme="dark"] #viewer::-webkit-scrollbar-thumb,
body[data-theme="dark"] #viewer .epub-container::-webkit-scrollbar-thumb {
  background: #4d6a60;
  border-color: #172420;
}