:root {
  color-scheme: light;
  --bg: #f7f7f6;
  --surface: #ffffff;
  --surface-strong: #f1f1f0;
  --text: #111111;
  --muted: #575757;
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.1);
  --border: rgba(17, 24, 39, 0.08);
  --shadow: 0 18px 60px rgba(15, 23, 42, 0.08);
}

html.dark {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #111827;
  --surface-strong: #1f2937;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #7c3aed;
  --accent-soft: rgba(124, 58, 237, 0.16);
  --border: rgba(148, 163, 184, 0.18);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, rgba(79, 70, 229, 0.08), transparent 40%), var(--bg);
  color: var(--text);
}

button,
input {
  font: inherit;
}

.app-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px;
  padding-bottom: 120px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
}

.brand {
  display: grid;
  gap: 6px;
}

.brand strong {
  font-size: 1.3rem;
}

.brand span {
  color: var(--muted);
  font-size: 0.95rem;
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.pill {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.pill:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.pill-secondary {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.pill-secondary:hover {
  background: rgba(79, 70, 229, 0.18);
}

.panel.controls {
  display: grid;
  gap: 18px;
  padding: 20px;
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.file-controls {
  display: grid;
  gap: 14px;
}

.file-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.drop-zone {
  min-height: 110px;
  border: 2px dashed var(--border);
  border-radius: 18px;
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--surface-strong);
  color: var(--muted);
  transition: border-color 0.2s ease, background 0.2s ease;
  cursor: pointer;
  touch-action: manipulation;
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(79, 70, 229, 0.05);
}

.file-info {
  color: var(--muted);
  font-size: 0.95rem;
}

.sliders {
  display: grid;
  gap: 10px;
}

#ghostSlider {
  width: 100%;
}

.actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.hint {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
  padding-top: 4px;
}

.reader {
  min-height: 420px;
  padding: 30px;
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow-anchor: none;
  touch-action: pan-y;
}

.reader-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.92);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(10px);
  z-index: 10;
}

html.dark .reader-footer {
  background: rgba(17, 24, 39, 0.96);
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.reader-footer.hidden {
  display: none;
}

.footer-label {
  color: var(--muted);
  font-size: 0.95rem;
  white-space: nowrap;
}

.footer-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

@media (max-width: 720px) {
  .reader-footer {
    padding: 10px 12px;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
  }
  .footer-label {
    font-size: 0.85rem;
    flex-shrink: 0;
  }
  .footer-actions {
    display: flex;
    gap: 6px;
    flex: 0 1 auto;
    min-width: 0;
  }
  .footer-actions .pill {
    font-size: 0.85rem;
    padding: 8px 12px;
    flex: 1;
    min-width: 60px;
  }
}

.empty-state {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.reader h1,
.reader h2,
.reader h3,
.reader h4,
.reader h5 {
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  line-height: 1.2;
}

.reader p,
.reader li {
  line-height: 1.8;
  margin: 0.8rem 0;
}

.reader li {
  padding-left: 0.5rem;
}

.reader ol,
.reader ul {
  padding-left: 1.2rem;
}

.block {
  position: relative;
  transition: background-color 0.2s ease;
  padding: 8px 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  touch-action: none;
}

.block.current {
  background: var(--accent-soft);
}

.ghost-word {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2ch;
  padding: 0 0.15em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  white-space: nowrap;
  transition: background 0.2s ease, transform 0.2s ease;
}

.ghost-word.revealed {
  background: rgba(79, 70, 229, 0.14);
  color: var(--text);
  width: auto !important;
  min-width: 0;
  display: inline;
}

.actions .pill:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.reader {
  min-height: 420px;
  padding: 30px;
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow-anchor: none;
  touch-action: pan-y;
}

.tooltip {
  pointer-events: none;
  position: fixed;
  z-index: 20;
  padding: 16px 24px;
  border-radius: 20px;
  background: var(--surface-strong);
  color: var(--text);
  border: 2px solid var(--border);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.2);
  opacity: 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
  font-size: 1.1rem;
  font-weight: 500;
  max-width: 85vw;
  top: 18%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

.tooltip.visible {
  opacity: 1;
  transform: translateY(-6px);
}

@media (max-width: 720px) {
  .app-shell {
    padding: 16px;
  }
  .topbar,
  .panel.controls {
    gap: 14px;
  }
}