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

:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f5;
  --bg-panel: #ffffff;
  --text: #0a0a0a;
  --text-muted: #555555;
  --text-hint: #aaaaaa;
  --border: rgba(0,0,0,0.09);
  --border-strong: rgba(0,0,0,0.16);
  --scanner-bg: #f7f7f7;
  --scanner-viewport: rgba(0,0,0,0.12);
  --font: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --radius: 5px;
  --scanner-w: 66px;
  --chart-h: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080808;
    --bg-alt: #111111;
    --bg-panel: #0e0e0e;
    --text: #eeeeee;
    --text-muted: #888888;
    --text-hint: #3a3a3a;
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.16);
    --scanner-bg: #050505;
    --scanner-viewport: rgba(255,255,255,0.13);
  }
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.app { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

/* ── HEADER ── */
header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 46px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  gap: 16px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
  flex-shrink: 0;
  user-select: none;
  cursor: pointer;
  text-decoration: none;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font);
}

.wordmark:hover { opacity: 0.7; }
.wordmark svg { width: 12px; height: 17px; fill: var(--text); flex-shrink: 0; }

.stats-bar { display: flex; align-items: center; gap: 22px; }
.stat { display: flex; flex-direction: column; align-items: flex-end; }
.stat-val { font-size: 13px; font-weight: 500; letter-spacing: -0.02em; line-height: 1.1; }
.stat-label { font-size: 9px; color: var(--text-hint); text-transform: uppercase; letter-spacing: 0.07em; margin-top: 1px; }

/* ── BODY ── */
.body { flex: 1; display: flex; overflow: hidden; position: relative; }

/* ── CHART ── */
.chart-bar {
  flex-shrink: 0;
  height: var(--chart-h);
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

#line-chart { display: block; width: 100%; height: 100%; }

.chart-tag {
  position: absolute;
  font-size: 8px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-hint);
  pointer-events: none;
}

.chart-tag.tl { top: 5px; left: 8px; }
.chart-tag.bl { bottom: 5px; left: 8px; }

.chart-cursor {
  position: absolute;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--text);
  opacity: 0.22;
  pointer-events: none;
  transition: left 0.04s linear;
}

/* ── EDITOR ── */
.editor-wrap { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.editor-inner {
  flex: 1;
  overflow-y: auto;
  padding: 36px 44px 80px;
}

@media (max-width: 640px) {
  .editor-inner { padding: 22px 18px 80px; }
}

#rendered-text {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.95;
  color: var(--text);
  max-width: 660px;
  margin: 0 auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  letter-spacing: -0.005em;
}

/* ── EMPTY STATE ── */
.empty-state {
  max-width: 520px;
  margin: 0 auto;
  padding-top: 30px;
}

.empty-state h2 {
  font-size: 21px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.025em;
  margin-bottom: 9px;
}

.empty-state .sub {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
}

#paste-area {
  width: 100%;
  height: 76px;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
  resize: none;
  outline: none;
  transition: border-color 0.12s;
  display: block;
  letter-spacing: -0.005em;
}

#paste-area:focus { border-color: var(--text); }
#paste-area::placeholder { color: var(--text-hint); }

.scan-btn {
  width: 100%;
  margin-top: 7px;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: var(--radius);
  padding: 9px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.14s;
  letter-spacing: -0.01em;
}

.scan-btn:hover { opacity: 0.76; }

.or-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0;
  color: var(--text-hint);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.book-row { display: flex; gap: 7px; align-items: center; }

.book-select-wrap { position: relative; flex: 1; }

.book-select-wrap select {
  width: 100%;
  appearance: none;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 26px 8px 10px;
  font-family: var(--font);
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  outline: none;
  letter-spacing: -0.01em;
}

.book-select-wrap::after {
  content: '▾';
  position: absolute;
  right: 9px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--text-muted);
  pointer-events: none;
}

.load-btn {
  flex-shrink: 0;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: var(--radius);
  padding: 8px 15px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.14s;
  letter-spacing: -0.01em;
}

.load-btn:hover { opacity: 0.76; }

/* ── LEGEND ── */
.legend {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 6px 44px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  font-size: 10px;
  color: var(--text-hint);
  letter-spacing: 0.01em;
}

@media (max-width: 640px) {
  .legend { padding: 6px 18px; }
}

.legend-item { display: flex; align-items: center; gap: 5px; }
.legend-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.legend-spacer { flex: 1; }

.back-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 10px;
  cursor: pointer;
  letter-spacing: 0;
  padding: 0;
}

.back-btn:hover { color: var(--text); }

/* ── SCANNER ── */
.scanner {
  flex-shrink: 0;
  width: var(--scanner-w);
  background: var(--scanner-bg);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  cursor: ns-resize;
}

.scanner-canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#scanner-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}

.scanner-viewport {
  position: absolute;
  left: 0;
  width: 100%;
  background: var(--scanner-viewport);
  border-top: 1px solid rgba(128,128,128,0.25);
  border-bottom: 1px solid rgba(128,128,128,0.25);
  pointer-events: none;
}

.scanner-label {
  flex-shrink: 0;
  font-family: var(--font);
  font-size: 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-hint);
  text-align: center;
  padding: 4px 0;
  border-top: 1px solid var(--border);
}

/* ── LOADING ── */
.loading-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--bg);
  z-index: 10;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 11px;
}

.loading-overlay.active { display: flex; }

.loading-spinner {
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--border-strong);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.loading-text {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── RESPONSIVE ── */
@media (max-width: 480px) {
  .scanner { display: none; }
}

.editor-inner::-webkit-scrollbar { width: 3px; }
.editor-inner::-webkit-scrollbar-track { background: transparent; }
.editor-inner::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }