/* ── Design tokens mirroring Kolibri Design System ──────────────────
   In the real plugin these come from:
     $themeTokens (kolibri-design-system)
     $themePalette.grey.v_300 (TopBar, BottomBar backgrounds)
   Chrome UI uses $themeTokens; EPUB reader themes stay hardcoded
   (per the EpubConstants.js comment in the existing plugin).
*/
:root {
  --kds-surface: #ffffff;
  --kds-text: #212121;
  --kds-topbar-bg: #e0e0e0;     /* $themePalette.grey.v_300 */
  --kds-border: #bdbdbd;
  --kds-primary: #1565c0;
  --kds-primary-light: #e3f2fd;
  --sidebar-width: 280px;
  --topbar-height: 44px;
  --bottombar-height: 52px;
}

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

body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  background: var(--kds-surface);
  color: var(--kds-text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Top Bar - mirrors TopBar.vue ─── */
#top-bar {
  height: var(--topbar-height);
  background: var(--kds-topbar-bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  border-bottom: 1px solid var(--kds-border);
  flex-shrink: 0;
  z-index: 10;
}

#top-bar-title {
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 300px;
  color: var(--kds-text);
}

.toolbar-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 6px 8px;
  cursor: pointer;
  color: var(--kds-text);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-btn:hover {
  background: rgba(0,0,0,0.08);
  border-color: var(--kds-border);
}

.toolbar-btn:focus-visible {
  outline: 2px solid var(--kds-primary);
  outline-offset: 1px;
}

.toolbar-btn.active {
  background: var(--kds-primary-light);
  color: var(--kds-primary);
}

.btn-group { display: flex; gap: 4px; align-items: center; }

/* ── Main content area ─── */
#main {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ── TOC Sidebar - mirrors TableOfContentsSideBar.vue ─── */
#toc-sidebar {
  width: var(--sidebar-width);
  background: var(--kds-surface);
  border-right: 1px solid var(--kds-border);
  overflow-y: auto;
  flex-shrink: 0;
  transform: translateX(0);
  transition: width 0.2s ease, transform 0.2s ease;
}

#toc-sidebar.hidden {
  width: 0;
  overflow: hidden;
}

#toc-sidebar h3 {
  padding: 12px 16px 8px;
  font-size: 13px;
  font-weight: 500;
  color: #757575;
  border-bottom: 1px solid var(--kds-border);
}

#toc-list { padding: 8px 0; }

.toc-item {
  display: block;
  padding: 8px 16px;
  text-decoration: none;
  color: var(--kds-text);
  font-size: 13px;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  margin: 1px 8px;
  width: calc(100% - 16px);
}

.toc-item:hover { background: #f5f5f5; }

.toc-item[aria-current="true"] {
  background: var(--kds-primary-light);
  color: var(--kds-primary);
  font-weight: 500;
}

.toc-item.level-1 { padding-left: 28px; font-size: 12px; }
.toc-item.level-2 { padding-left: 40px; font-size: 12px; }

/* ── Settings Sidebar - mirrors SettingsSideBar.vue ─── */
#settings-sidebar {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--sidebar-width);
  height: 100%;
  background: var(--kds-surface);
  border-left: 1px solid var(--kds-border);
  padding: 16px;
  overflow-y: auto;
  z-index: 5;
  display: none;
}

#settings-sidebar.visible { display: block; }

#settings-sidebar h3 {
  font-size: 13px;
  font-weight: 500;
  color: #757575;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--kds-border);
}

.settings-section { margin-bottom: 20px; }

.font-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.font-btn {
  padding: 8px;
  border: 1px solid var(--kds-border);
  border-radius: 4px;
  background: none;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.font-btn:hover { background: #f5f5f5; }
.font-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Reader themes - hardcoded per EpubConstants.js convention */
/* These are intentionally NOT using $themeTokens */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.theme-btn {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 4px;
  border: 2px solid transparent;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 500;
}

.theme-btn.selected { border-color: var(--kds-primary); }

.theme-btn .check {
  display: none;
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 10px;
}

.theme-btn.selected .check { display: block; }

/* ── Viewer area ─── */
#viewer-container {
  flex: 1;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: stretch;
}

/* Nav buttons - mirrors PreviousButton.vue / NextButton.vue */
.nav-btn {
  width: 48px;
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #757575;
  font-size: 20px;
  transition: background 0.15s;
}

.nav-btn:hover { background: rgba(0,0,0,0.04); }
.nav-btn:disabled { opacity: 0.25; cursor: not-allowed; }
.nav-btn:focus-visible { outline: 2px solid var(--kds-primary); }

/* Sandboxed reader host frame */
#sandbox-frame {
  flex: 1;
  min-width: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

/* ── Loading / Error states - mirrors LoadingScreen.vue / LoadingError.vue ─── */
#loading-state, #error-state, #drop-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--kds-surface);
  z-index: 20;
}

#loading-state { display: none; }
#error-state   { display: none; }
#drop-state    { display: flex; }

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #e0e0e0;
  border-top-color: var(--kds-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.state-msg {
  font-size: 14px;
  color: #757575;
}

.error-msg {
  font-size: 14px;
  color: #c62828;
  text-align: center;
  max-width: 320px;
}

.drop-area {
  border: 2px dashed var(--kds-border);
  border-radius: 8px;
  padding: 40px 60px;
  text-align: center;
  cursor: pointer;
}

.drop-area:hover { border-color: var(--kds-primary); background: var(--kds-primary-light); }

.drop-icon { font-size: 48px; margin-bottom: 8px; opacity: 0.5; }

.drop-label { font-size: 16px; font-weight: 500; color: var(--kds-text); margin-bottom: 4px; }

.drop-sub { font-size: 13px; color: #757575; }

.open-url-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  width: 100%;
  max-width: 400px;
}

.open-url-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--kds-border);
  border-radius: 4px;
  font-size: 13px;
}

.btn-primary {
  padding: 8px 16px;
  background: var(--kds-primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}

.btn-primary:hover { background: #0d47a1; }

/* ── Bottom Bar - mirrors BottomBar.vue ─── */
#bottom-bar {
  height: var(--bottombar-height);
  background: var(--kds-topbar-bg);
  border-top: 1px solid var(--kds-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px 48px;
  flex-shrink: 0;
}

#section-title {
  font-size: 11px;
  color: #757575;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
  text-align: center;
  margin-bottom: 4px;
}

#progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

#progress-pct {
  font-size: 11px;
  color: #757575;
  min-width: 36px;
  text-align: right;
}

/* Progress slider - mirrors BottomBar.vue's <input type="range"> */
#progress-slider {
  flex: 1;
  height: 4px;
  cursor: pointer;
  accent-color: var(--kds-primary);
}

/* ── Debug log (proposal evidence panel) ────────────────── */
#event-log {
  position: fixed;
  bottom: var(--bottombar-height);
  right: 0;
  width: 280px;
  max-height: 200px;
  background: rgba(0,0,0,0.85);
  color: #a5d6a7;
  font-family: monospace;
  font-size: 11px;
  overflow-y: auto;
  padding: 8px;
  z-index: 100;
  display: none;
}

#event-log.visible { display: block; }

.log-line { padding: 1px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.log-event { color: #80cbc4; }
.log-val   { color: #fff59d; }

/* Prototype badge */
#prototype-badge {
  position: fixed;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: #1565c0;
  color: white;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 12px;
  z-index: 50;
  pointer-events: none;
}