:root {
  --bg-primary: #12131a;
  --bg-surface: #1e2230;
  --bg-elevated: #282d40;
  --text-main: #eef0f6;
  --text-muted: #a6adc8;
  --accent-gold: #f5c26b;
  --accent-cyan: #7dcfff;
  --highlight-bg: rgba(245, 194, 107, 0.24);
  --reader-font-size: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-main);
  font-family: "Noto Serif JP", "Yu Mincho", "Noto Serif TC", serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.app-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.toolbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.book-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-gold);
}

.toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-btn,
.file-import-btn,
.toolbar-select,
.mode-btn {
  background: var(--bg-elevated);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  padding: 0.35rem 0.65rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.mode-btn.active {
  background: var(--accent-gold);
  color: #12131a;
  font-weight: 700;
}

.app-workspace {
  flex: 1;
  display: flex;
  min-height: 0;
  position: relative;
}

.toc-drawer {
  width: 260px;
  background: var(--bg-surface);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1rem;
  overflow-y: auto;
}

.toc-drawer.collapsed {
  display: none;
}

.drawer-section h2 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
}

.nav-list li button {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text-main);
  border: none;
  padding: 0.45rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
}

.nav-list li button:hover,
.nav-list li button.active {
  background: var(--bg-elevated);
  color: var(--accent-gold);
}

.reading-viewport {
  flex: 1;
  overflow: auto;
  padding: 2rem;
}

.reading-container {
  font-size: var(--reader-font-size, 18px);
  line-height: 1.9;
  letter-spacing: 0.04em;
  min-height: 100%;
}

.reading-container.writing-vertical-rl {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  height: calc(100vh - 160px);
  overflow-x: auto;
}

.reading-container.writing-horizontal-tb {
  writing-mode: horizontal-tb;
  max-width: 780px;
  margin: 0 auto;
}

.reader-segment {
  margin: 0 0 0.9em 0;
  padding: 0.2em 0.35em;
  border-radius: 6px;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.reading-container.writing-vertical-rl .reader-segment {
  margin: 0 0 0 1.1em;
}

/* 1. Anime Extracted Dialogue: Vibrant Blue / Cyan */
.reader-segment[data-source="anime_extracted"] {
  color: #38bdf8 !important;
  border-inline-start: 3px solid #38bdf8;
  padding-inline-start: 0.5em;
  cursor: pointer;
}
.reader-segment[data-source="anime_extracted"] .segment-primary {
  color: #38bdf8 !important;
  font-weight: 500;
}

/* 2. Unmatched Dialogue (No Anime Audio, Not Synthesized): Distinct Orange / Amber */
.reader-segment[data-type="dialogue"]:not([data-source="anime_extracted"]),
.reader-segment[data-source="tts_fallback"] {
  color: #fb923c !important;
  border-inline-start: 3px solid rgba(251, 146, 60, 0.85);
  padding-inline-start: 0.5em;
  cursor: pointer;
}
.reader-segment[data-type="dialogue"]:not([data-source="anime_extracted"]) .segment-primary,
.reader-segment[data-source="tts_fallback"] .segment-primary {
  color: #fb923c !important;
  font-weight: 500;
}

/* 3. In Mode 2 (tap-dialogue): interactive styling */
.reading-container.mode-tap-dialogue .reader-segment[data-source="anime_extracted"] {
  cursor: pointer;
  border-bottom: 1px dashed rgba(56, 189, 248, 0.6);
}
.reading-container.mode-tap-dialogue .reader-segment[data-source="anime_extracted"]:hover {
  background: rgba(56, 189, 248, 0.12);
}
.reading-container.mode-tap-dialogue .reader-segment[data-type="dialogue"]:not([data-source="anime_extracted"]) {
  cursor: not-allowed;
  opacity: 0.85;
}

.reading-container.mode-read-along .reader-segment {
  cursor: pointer;
}

/* Highlight styles: dialogues preserve their theme color glow when active */
.reader-segment.active-highlight {
  background: var(--highlight-bg);
  box-shadow: 0 0 0 1px var(--accent-gold);
}

.reader-segment[data-source="anime_extracted"].active-highlight {
  background: rgba(56, 189, 248, 0.22);
  box-shadow: 0 0 0 2px #38bdf8;
}

.reader-segment[data-type="dialogue"]:not([data-source="anime_extracted"]).active-highlight,
.reader-segment[data-source="tts_fallback"].active-highlight {
  background: rgba(251, 146, 60, 0.22);
  box-shadow: 0 0 0 2px #fb923c;
}

/* Legend Indicators in Toolbar */
.legend-indicators {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
}

.legend-badge {
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  user-select: none;
}

.legend-anime {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.45);
}

.legend-unmatched {
  background: rgba(251, 146, 60, 0.15);
  color: #fb923c;
  border: 1px solid rgba(251, 146, 60, 0.45);
}

.segment-zh {
  display: block;
  color: var(--text-muted);
  font-size: 0.92em;
  margin-top: 0.2em;
}

.audio-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--bg-surface);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.audio-bar audio {
  flex: 1;
  height: 36px;
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(18, 19, 26, 0.85);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.loading-box {
  background: var(--bg-surface);
  border: 1px solid var(--accent-gold);
  border-radius: 8px;
  padding: 2rem;
  max-width: 420px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.loading-spinner {
  width: 44px;
  height: 44px;
  margin: 0 auto 1.2rem;
  border: 4px solid rgba(245, 194, 107, 0.2);
  border-top-color: var(--accent-gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
  white-space: pre-line;
  margin: 0;
}