:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-soft: #eef2f7;
  --text: #17202a;
  --muted: #647080;
  --border: #d9e0ea;
  --accent: #0f8b8d;
  --accent-strong: #096568;
  --accent-soft: #d9f1ef;
  --warm: #d95f3d;
  --warning-soft: #ffe9dd;
  --shadow: 0 18px 50px rgba(22, 32, 42, 0.12);
  --reader-bg: #fbfcfd;
  --reader-text: #151a20;
  --reader-link: #0f6f8a;
  --panel-width: 292px;
  --tools-width: 340px;
  --topbar-height: 64px;
  --mobile-bar-height: 68px;
  --content-width: 860px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101114;
  --surface: #1a1d22;
  --surface-soft: #242932;
  --text: #eef2f7;
  --muted: #aab4c0;
  --border: #343b46;
  --accent: #40b8a6;
  --accent-strong: #65d7c7;
  --accent-soft: #163d3b;
  --warm: #ff8a5b;
  --warning-soft: #47291f;
  --shadow: 0 18px 54px rgba(0, 0, 0, 0.36);
  --reader-bg: #14161a;
  --reader-text: #edf1f5;
  --reader-link: #7bd5ff;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  letter-spacing: 0;
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 42%, transparent);
  outline-offset: 2px;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--panel-width) minmax(0, 1fr) var(--tools-width);
  grid-template-rows: var(--topbar-height) minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
}

.app-shell.is-library-collapsed {
  grid-template-columns: 0 minmax(0, 1fr) var(--tools-width);
}

.app-shell.is-tools-collapsed {
  grid-template-columns: var(--panel-width) minmax(0, 1fr) 0;
}

.app-shell.is-library-collapsed.is-tools-collapsed {
  grid-template-columns: 0 minmax(0, 1fr) 0;
}

.topbar {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto minmax(160px, max-content) minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(16px);
  z-index: 20;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-weight: 760;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 850;
}

.book-status {
  min-width: 0;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.top-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.panel {
  min-width: 0;
  min-height: 0;
  background: var(--surface);
  overflow: auto;
}

.library-panel {
  grid-row: 2;
  border-right: 1px solid var(--border);
}

.tools-panel {
  grid-column: 3;
  grid-row: 2;
  border-left: 1px solid var(--border);
}

.app-shell.is-library-collapsed .library-panel,
.app-shell.is-tools-collapsed .tools-panel {
  display: none;
}

.panel-section,
.tool-section {
  padding: 18px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-heading h2,
.section-heading h3,
.settings-group h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.2;
}

.section-heading h2 {
  font-size: 1.08rem;
}

.section-heading.compact {
  margin-bottom: 10px;
}

.section-heading.compact span {
  color: var(--muted);
  font-size: 0.9rem;
}

.icon-btn,
.tool-btn,
.primary-btn,
.mini-btn,
.tab-btn,
.book-action {
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  transition:
    background 0.16s ease,
    border-color 0.16s ease,
    color 0.16s ease,
    transform 0.12s ease;
}

.icon-btn:hover,
.tool-btn:hover,
.primary-btn:hover,
.mini-btn:hover,
.tab-btn:hover,
.book-action:hover {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
  background: var(--surface-soft);
}

.icon-btn:active,
.tool-btn:active,
.primary-btn:active,
.mini-btn:active,
.tab-btn:active,
.book-action:active {
  transform: translateY(1px);
}

.icon-btn:disabled,
.tool-btn:disabled,
.primary-btn:disabled,
.mini-btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
}

.icon-btn svg,
.tool-btn svg,
.primary-btn svg,
.tab-btn svg,
.mobile-bar svg,
.empty-art svg,
.drop-zone svg {
  width: 19px;
  height: 19px;
  stroke-width: 2.2;
}

.fallback-icon {
  display: inline-grid;
  place-items: center;
  width: 19px;
  height: 19px;
  font-style: normal;
  font-weight: 800;
  line-height: 1;
}

.tool-btn,
.primary-btn,
.mini-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 14px;
  font-weight: 650;
}

.primary-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

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

.mini-btn {
  min-height: 34px;
  padding: 0 10px;
  font-size: 0.88rem;
}

.mobile-only,
.mobile-close {
  display: none;
}

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 132px;
  gap: 10px;
  padding: 18px;
  border: 1.5px dashed color-mix(in srgb, var(--accent) 56%, var(--border));
  border-radius: 8px;
  color: var(--muted);
  background: var(--accent-soft);
  text-align: center;
  cursor: pointer;
}

.drop-zone.is-dragover {
  color: var(--accent-strong);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 72%, var(--surface));
}

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

.book-empty,
.toc-empty,
.result-empty {
  color: var(--muted);
  line-height: 1.55;
}

.book-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  align-items: center;
  width: 100%;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  text-align: left;
}

.book-card.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 56%, var(--surface));
}

.book-open {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-width: 0;
  min-height: 72px;
  padding: 4px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.book-open:hover {
  background: color-mix(in srgb, var(--surface-soft) 70%, transparent);
}

.book-cover {
  width: 46px;
  height: 64px;
  overflow: hidden;
  border-radius: 6px;
  background: linear-gradient(145deg, var(--accent), var(--warm));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

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

.book-info {
  min-width: 0;
}

.book-title {
  margin: 0 0 4px;
  font-weight: 720;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.book-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-action {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
}

.book-action svg {
  width: 16px;
  height: 16px;
}

.reader-main {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
  min-height: 0;
  display: grid;
  background: var(--reader-bg);
}

.empty-state {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 14px;
  padding: 36px;
  text-align: center;
}

.empty-state h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  line-height: 1.1;
}

.empty-state p {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.empty-art {
  display: grid;
  place-items: center;
  width: 82px;
  height: 82px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--surface));
  color: var(--accent-strong);
}

.empty-art svg {
  width: 42px;
  height: 42px;
}

.reader-stage {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
}

.is-hidden {
  display: none !important;
}

.reader-frame {
  position: relative;
  width: min(100%, var(--content-width));
  min-width: 0;
  min-height: 0;
  justify-self: center;
  align-self: stretch;
  padding: 0;
  background: var(--reader-bg);
}

.viewer {
  width: 100%;
  height: 100%;
  min-height: 0;
}

.viewer iframe {
  background: var(--reader-bg);
}

.turn-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: min(16vw, 96px);
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  opacity: 0;
}

.turn-prev {
  left: 0;
}

.turn-next {
  right: 0;
}

.reader-footer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 74px;
  padding: 10px 18px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 95%, transparent);
}

.progress-wrap {
  min-width: 0;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.88rem;
}

#chapterLabel {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.panel-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 0 14px 12px;
}

.tab-btn {
  display: grid;
  place-items: center;
  gap: 4px;
  min-width: 0;
  min-height: 58px;
  padding: 7px 4px;
  color: var(--muted);
  font-size: 0.78rem;
}

.tab-btn.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
}

.tool-section {
  display: none;
  padding-top: 0;
}

.tool-section.is-active {
  display: block;
}

.toc-list,
.search-results,
.bookmark-list {
  display: grid;
  gap: 8px;
}

.toc-item,
.result-item,
.bookmark-item {
  display: grid;
  gap: 4px;
  width: 100%;
  padding: 10px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.toc-item {
  grid-template-columns: minmax(0, 1fr);
}

.toc-item[data-depth="1"] {
  padding-left: 22px;
}

.toc-item[data-depth="2"] {
  padding-left: 34px;
}

.toc-item[data-depth="3"] {
  padding-left: 46px;
}

.toc-item:hover,
.result-item:hover,
.bookmark-item:hover {
  background: var(--surface-soft);
  border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
}

.toc-label,
.result-title,
.bookmark-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 650;
}

.result-excerpt,
.bookmark-meta {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.bookmark-item {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.bookmark-delete {
  width: 34px;
  height: 34px;
}

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

.field,
.range-field {
  display: grid;
  gap: 8px;
  margin: 12px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.field select,
.field input[type="search"] {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 11px;
  background: var(--surface);
  color: var(--text);
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.settings-group {
  padding: 14px 0;
  border-top: 1px solid var(--border);
}

.settings-group:first-child {
  border-top: 0;
  padding-top: 0;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-top: 12px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
}

.segmented button {
  min-width: 0;
  min-height: 36px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 650;
}

.segmented button.is-active {
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
}

.range-field span {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

output {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.switch-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.switch-row p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.switch {
  position: relative;
  width: 52px;
  height: 32px;
  display: inline-block;
}

.switch input {
  position: absolute;
  opacity: 0;
}

.switch span {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  cursor: pointer;
}

.switch span::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--surface);
  box-shadow: 0 2px 7px rgba(0, 0, 0, 0.22);
  transition: transform 0.16s ease;
}

.switch input:checked + span {
  border-color: var(--accent);
  background: var(--accent);
}

.switch input:checked + span::after {
  transform: translateX(20px);
}

.mobile-bar,
.backdrop {
  display: none;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 80;
  max-width: min(520px, calc(100vw - 32px));
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition:
    opacity 0.18s ease,
    transform 0.18s ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.toast.is-error {
  border-color: color-mix(in srgb, var(--warm) 72%, var(--border));
  background: var(--warning-soft);
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .app-shell.is-library-collapsed {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .app-shell.is-tools-collapsed,
  .app-shell.is-library-collapsed.is-tools-collapsed {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .app-shell.is-library-collapsed.is-tools-collapsed {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .app-shell.is-tools-collapsed .tools-panel {
    display: block;
  }

  .tools-panel {
    position: fixed;
    top: var(--topbar-height);
    right: 0;
    bottom: 0;
    z-index: 50;
    width: min(var(--tools-width), calc(100vw - 32px));
    transform: translateX(100%);
    transition: transform 0.22s ease;
    box-shadow: var(--shadow);
  }

  .tools-panel.is-open {
    transform: translateX(0);
  }

  .mobile-only,
  .mobile-close {
    display: inline-grid;
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 45;
    background: rgba(7, 10, 16, 0.42);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease;
  }

  .backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
  }
}

@media (max-width: 820px) {
  :root {
    --topbar-height: 58px;
  }

  body {
    overflow: hidden;
  }

  .app-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: var(--topbar-height) minmax(0, 1fr) calc(var(--mobile-bar-height) + var(--safe-bottom));
  }

  .app-shell.is-library-collapsed,
  .app-shell.is-tools-collapsed,
  .app-shell.is-library-collapsed.is-tools-collapsed {
    grid-template-columns: minmax(0, 1fr);
  }

  .topbar {
    grid-template-columns: 42px 42px minmax(0, 1fr) auto;
    gap: 6px;
    padding: 8px 8px;
  }

  .brand span:last-child {
    display: none;
  }

  .book-status {
    grid-column: 3;
    text-align: center;
  }

  .top-actions {
    grid-column: 4;
    gap: 6px;
  }

  .tool-btn {
    width: 42px;
    padding: 0;
  }

  .tool-btn span {
    display: none;
  }

  .library-panel,
  .tools-panel {
    position: fixed;
    top: var(--topbar-height);
    bottom: calc(var(--mobile-bar-height) + var(--safe-bottom));
    z-index: 50;
    width: min(340px, calc(100vw - 34px));
    box-shadow: var(--shadow);
    transition: transform 0.22s ease;
  }

  .app-shell.is-library-collapsed .library-panel,
  .app-shell.is-tools-collapsed .tools-panel {
    display: block;
  }

  .library-panel {
    left: 0;
    transform: translateX(-100%);
  }

  .library-panel.is-open {
    transform: translateX(0);
  }

  .tools-panel {
    right: 0;
    transform: translateX(100%);
  }

  .reader-main {
    grid-column: 1;
    grid-row: 2;
  }

  .reader-footer {
    min-height: 62px;
    padding: 8px 8px;
    grid-template-columns: minmax(0, 1fr);
  }

  .reader-footer > .icon-btn {
    display: none;
  }

  .progress-wrap {
    width: 100%;
  }

  .progress-meta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
  }

  .reader-frame {
    width: 100%;
  }

  .turn-zone {
    width: 22vw;
  }

  .empty-state {
    padding: 24px;
  }

  .mobile-bar {
    grid-row: 3;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    padding: 6px 8px calc(6px + var(--safe-bottom));
    border-top: 1px solid var(--border);
    background: var(--surface);
    z-index: 25;
  }

  .mobile-bar button {
    display: grid;
    place-items: center;
    gap: 3px;
    min-width: 0;
    min-height: 54px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 0.74rem;
  }

  .mobile-bar button:active {
    background: var(--surface-soft);
    color: var(--accent-strong);
  }
}

@media (max-width: 430px) {
  .topbar {
    grid-template-columns: 42px 42px minmax(0, 1fr) auto;
  }

  .book-status {
    font-size: 0.82rem;
  }

  .top-actions {
    gap: 4px;
  }

  .top-actions .icon-btn,
  .top-actions .tool-btn,
  .topbar > .icon-btn {
    width: 40px;
    height: 40px;
  }

  .panel-section,
  .tool-section {
    padding-inline: 14px;
  }

  .panel-tabs {
    padding-inline: 10px;
  }

  .tab-btn span {
    font-size: 0.72rem;
  }

  .empty-state h1 {
    font-size: 1.45rem;
  }
}