:root {
  color-scheme: dark;
  --bg: #0d0d0d;
  --surface: #181818;
  --surface-2: #222;
  --text: #e8e8e8;
  --muted: #8a8a8a;
  --line: #2c2c2c;
  --orp: #ff3333;
  --ctx: #7ecbff;
  --btn: #2a2a2a;
  --btn-hover: #353535;
  --primary: #c62828;
  --primary-hover: #e53935;
  --radius: 12px;
  --pad: 12px;
  --max: 920px;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
}

body {
  padding: max(10px, env(safe-area-inset-top))
    max(10px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom))
    max(10px, env(safe-area-inset-left));
}

.app {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.back {
  color: var(--accent, #7eb8ff);
  text-decoration: none;
  font-size: 0.85rem;
  flex: none;
}

.back:hover {
  text-decoration: underline;
}

.logo {
  border-radius: 8px;
  flex: none;
}

.brand {
  flex: 1;
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.tag {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.panel,
.reader {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--pad);
}

.disclosure {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  background: none;
  border: 0;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  padding: 2px 0;
  cursor: pointer;
  text-align: left;
}

.disclosure[aria-expanded="false"] .chevron {
  transform: rotate(-90deg);
}

.chevron {
  display: inline-block;
  transition: transform 0.15s ease;
}

.panel-body {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

[hidden] {
  display: none !important;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 7.5rem;
  background: #111;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  font: 1rem/1.4 var(--sans);
}

.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.file-name {
  color: var(--muted);
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.file-btn,
button,
.ghost {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--btn);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  font: 600 0.92rem var(--sans);
  cursor: pointer;
}

.file-btn {
  display: inline-block;
}

.file-btn input {
  display: none;
}

button:hover,
.file-btn:hover,
.ghost:hover {
  background: var(--btn-hover);
}

button.primary {
  background: var(--primary);
  border-color: #8e1d1d;
}

button.primary:hover {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.row.wrap,
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.btn-row button {
  min-height: 40px;
  padding: 8px 14px;
}

.speed-panel .row {
  width: 100%;
}

.slider-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  white-space: nowrap;
}

.slider-label.compact {
  font-size: 0.85rem;
}

.value {
  min-width: 2.4ch;
  font-variant-numeric: tabular-nums;
  color: var(--ctx);
}

input[type="range"] {
  flex: 1;
  min-width: 120px;
  accent-color: var(--orp);
}

.check {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
}

.transport {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 4px 0 10px;
}

.transport-btn {
  min-width: 52px;
  min-height: 48px;
  padding: 8px 12px;
  font-size: 1.15rem;
  line-height: 1;
  letter-spacing: 0.02em;
}

.pos-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.pos-row label {
  font-size: 0.88rem;
  color: var(--muted);
}

.pos-count {
  font-size: 0.82rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  min-width: 7ch;
  text-align: right;
}

.status {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.word-stage {
  background: #1a1a1a;
  border-radius: 10px;
  min-height: 28vw;
  max-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  cursor: pointer;
  padding: 28px 12px;
  -webkit-user-select: none;
  user-select: none;
  touch-action: pan-y;
}

.orp-track {
  display: grid;
  grid-template-columns: repeat(31, 1ch);
  font-family: var(--mono);
  font-size: clamp(28px, 7.2vw, 52px);
  font-variant-ligatures: none;
  line-height: 1;
  color: #e8e8e8;
}

.orp-track .cell {
  text-align: center;
  white-space: pre;
}

.orp-track .orp {
  color: var(--orp);
  font-weight: 700;
}

.hint {
  margin: 10px 0 0;
  color: #666;
  font-size: 0.78rem;
  line-height: 1.35;
}

.phone-only {
  display: none;
}

.ctx-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctx-head .disclosure {
  width: auto;
  flex: 1;
}

.context-text {
  margin-top: 8px;
  background: #222;
  color: #c8c8c8;
  border-radius: 8px;
  padding: 10px 12px;
  min-height: 4.5rem;
  overflow: auto;
  line-height: 1.45;
  font-size: 0.95rem;
}

.context-text mark {
  background: none;
  color: var(--ctx);
  font-weight: 700;
}

.bm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 8.5rem;
  overflow: auto;
  background: #111;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.bm-list:empty::after {
  content: "No bookmarks yet.";
  display: block;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.bm-list li {
  padding: 8px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
}

.bm-list li:last-child {
  border-bottom: 0;
}

.bm-list li.selected,
.bm-list li:hover {
  background: #2a2a2a;
}

.foot {
  color: #888;
  font-size: 0.78rem;
  padding: 4px 2px 8px;
}

dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  height: fit-content;
  max-height: calc(100dvh - 32px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  width: min(520px, calc(100vw - 24px));
  padding: 0;
  z-index: 40;
}

dialog:not([open]) {
  display: none;
}

dialog[open] {
  display: block;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
}

.about,
.mark-form {
  padding: 16px;
}

.about h2,
.mark-form h2 {
  margin: 0 0 4px;
}

.about img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 8px 0;
  background: #000;
  border-radius: 8px;
}

.caption,
.muted {
  color: var(--muted);
  font-size: 0.85rem;
}

.mark-form label {
  display: block;
  margin: 10px 0;
}

.mark-form input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  background: #111;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 720px) {
  body {
    padding: max(6px, env(safe-area-inset-top))
      max(8px, env(safe-area-inset-right))
      max(10px, env(safe-area-inset-bottom))
      max(8px, env(safe-area-inset-left));
  }

  .app {
    gap: 8px;
    min-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 16px);
  }

  .topbar {
    gap: 8px;
  }

  h1 {
    font-size: 1.05rem;
  }

  .tag {
    font-size: 0.7rem;
  }

  .panel,
  .reader {
    padding: 10px;
  }

  .desktop-only {
    display: none;
  }

  .phone-only {
    display: block;
  }

  .reader {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .status {
    font-size: 0.82rem;
    margin-bottom: 6px;
  }

  .transport {
    gap: 6px;
    margin: 0 0 8px;
  }

  .transport-btn {
    flex: 1 1 0;
    min-width: 0;
    min-height: 52px;
    font-size: 1.25rem;
    border-radius: 12px;
  }

  #play-btn {
    flex: 1.35 1 0;
  }

  .word-stage {
    flex: 1 1 auto;
    min-height: 42vh;
    max-height: none;
    padding: 36px 8px;
  }

  .orp-track {
    font-size: clamp(28px, 8vw, 48px);
  }

  .pos-row {
    margin-top: 8px;
  }

  .pos-row input[type="range"] {
    min-width: 0;
  }

  textarea {
    min-height: 4.5rem;
  }

  .file-row .file-btn,
  .file-row #prepare-btn {
    flex: 1 1 auto;
    min-height: 44px;
    text-align: center;
  }

  .foot {
    font-size: 0.7rem;
    padding-bottom: 4px;
  }
}

@media (min-width: 721px) {
  .word-stage {
    min-height: 200px;
  }

  .transport-btn {
    min-width: 64px;
  }
}