:root {
  color-scheme: light;
  --bg: #d8d1c2;
  --desk: #c8c0b0;
  --paper: #f4eedf;
  --paper-soft: #ece4d2;
  --panel: #e8dfce;
  --panel-soft: #f7f1e4;
  --text: #24211c;
  --muted: #746d61;
  --line: #c8bdab;
  --accent: #4d463d;
  --accent-strong: #211f1b;
  --accent-2: #726857;
  --accent-3: #9a907e;
  --danger: #9d3f34;
  --shadow: 0 22px 50px rgba(61, 51, 38, 0.18);
  --paper-shadow: 0 18px 60px rgba(70, 58, 42, 0.16), inset 0 0 0 1px rgba(255, 255, 255, 0.42);
}

body:not(.light) {
  color-scheme: dark;
  --bg: #1b1a18;
  --desk: #11100f;
  --paper: #24231f;
  --paper-soft: #302e28;
  --panel: #1e1d1a;
  --panel-soft: #2a2925;
  --text: #e9e0cf;
  --muted: #aaa08f;
  --line: #494337;
  --accent: #d8c9aa;
  --accent-strong: #fff3d7;
  --accent-2: #b7aa94;
  --accent-3: #8d826f;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
  --paper-shadow: 0 18px 60px rgba(0, 0, 0, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.18), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.04)),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 5px),
    var(--desk);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body.light {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.2), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.04)),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.09) 0 1px, transparent 1px 5px),
    var(--desk);
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
.import-label {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  color: var(--text);
  padding: 0 14px;
  cursor: pointer;
  box-shadow: none;
}

button:hover,
.import-label:hover {
  border-color: var(--accent-2);
}

.primary,
button.active {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--paper);
  font-weight: 800;
  box-shadow: none;
}

.danger {
  background: rgba(216, 92, 92, 0.12);
  border-color: var(--danger);
  color: var(--danger);
}

.app-shell {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  transition: grid-template-columns 180ms ease;
}

body.sidebar-collapsed .app-shell {
  grid-template-columns: 76px minmax(0, 1fr);
}

.sidebar {
  display: grid;
  min-width: 0;
  grid-template-rows: auto auto auto auto auto auto minmax(0, 1fr);
  gap: 14px;
  height: 100vh;
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 18px;
}

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

.brand > div {
  min-width: 0;
}

.sidebar-collapse-btn {
  margin-left: auto;
  min-width: 42px;
  width: 42px;
  font-size: 1.5rem;
}

.brand-logo {
  width: 58px;
  height: 58px;
  object-fit: contain;
  border-radius: 10px;
  background: var(--paper-soft);
  filter: grayscale(0.75) sepia(0.22) contrast(0.92);
  opacity: 0.9;
}

body.sidebar-collapsed .sidebar {
  padding: 12px 9px;
}

body.sidebar-collapsed .brand {
  flex-direction: column;
  gap: 10px;
}

body.sidebar-collapsed .brand-logo {
  width: 44px;
  height: 44px;
}

body.sidebar-collapsed .brand > div,
body.sidebar-collapsed .search-box,
body.sidebar-collapsed .sidebar-actions,
body.sidebar-collapsed .quick-select,
body.sidebar-collapsed .playlist-panel,
body.sidebar-collapsed .sidebar-status,
body.sidebar-collapsed .song-list {
  display: none;
}

body.sidebar-collapsed .sidebar-collapse-btn {
  margin-left: 0;
  transform: rotate(180deg);
}

.brand strong {
  font-size: 1.12rem;
  letter-spacing: 0;
}

.brand span,
.song-row span,
.song-heading p,
.transpose-panel span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.search-box input,
.quick-select,
.playlist-panel select,
.editor input,
.editor textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 12px;
}

.sidebar-status {
  min-height: 20px;
  margin: -4px 0 0;
  color: var(--accent);
  font-size: 0.86rem;
  line-height: 1.35;
}

.search-box input:focus,
.quick-select:focus,
.playlist-panel select:focus,
.editor input:focus,
.editor textarea:focus,
.transpose-panel input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
  outline: none;
}

.song-list {
  display: flex;
  min-height: 0;
  flex-direction: column;
  gap: 8px;
  overflow: auto;
  padding-bottom: 8px;
}

.song-row {
  display: block;
  width: 100%;
  height: auto;
  min-height: 64px;
  text-align: left;
}

.song-row.active {
  border-color: var(--accent);
  background: var(--paper);
  color: var(--text);
}

.song-row.active strong {
  color: var(--text);
}

.song-row.active span {
  color: var(--muted);
}

.playlist-panel {
  display: grid;
  gap: 8px;
  border: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 82%, var(--paper));
  padding: 10px;
}

.playlist-panel header,
.playlist-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.playlist-panel header strong {
  font-size: 0.95rem;
}

.playlist-panel button {
  min-height: 34px;
  padding-inline: 9px;
  font-size: 0.82rem;
}

.playlist-panel button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.playlist-items {
  display: grid;
  max-height: 188px;
  gap: 6px;
  overflow: auto;
  padding-right: 2px;
}

.playlist-empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

.playlist-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px 32px 32px;
  gap: 5px;
  align-items: stretch;
}

.playlist-item > button {
  min-width: 0;
  min-height: 34px;
  border-radius: 7px;
}

.playlist-pick {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  text-align: left;
}

.playlist-pick span {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.playlist-pick strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.84rem;
}

.playlist-item.active .playlist-pick {
  border-color: var(--accent);
  background: var(--paper);
}

.sidebar-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 2;
  border: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 88%, var(--paper));
  padding: 8px;
  box-shadow: 0 12px 32px rgba(0, 14, 10, 0.16);
}

.sidebar-actions .primary {
  grid-column: 1 / -1;
}

.sidebar-actions button,
.sidebar-actions .import-label {
  width: 100%;
  min-height: 42px;
  padding-inline: 8px;
  font-size: 0.88rem;
}

.import-label {
  display: grid;
  place-items: center;
}

.import-label input {
  display: none;
}

.stage {
  display: grid;
  min-width: 0;
  min-height: 0;
  height: 100vh;
  height: 100dvh;
  grid-template-rows: auto auto auto auto minmax(0, 1fr);
  overflow: hidden;
  background: var(--bg);
}

.topbar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 16px 22px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(10px);
}

.icon-btn {
  width: 46px;
  padding: 0;
  font-size: 1.35rem;
}

.song-heading h1 {
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 1.6rem;
  letter-spacing: 0;
}

.song-heading h1::selection,
.viewer pre::selection {
  background: color-mix(in srgb, var(--accent-3) 35%, transparent);
}

.song-heading p {
  margin: 4px 0 0;
}

.song-reference-link {
  display: inline-flex;
  width: fit-content;
  margin-top: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-soft);
  color: var(--accent-strong);
  padding: 4px 10px;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 750;
}

.song-reference-link[hidden] {
  display: none;
}

.status-strip {
  display: flex;
  gap: 10px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.status-strip span {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
  padding: 7px 10px;
}

.controls,
.transpose-panel,
.view-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 12px 22px;
}

body.reading-controls-collapsed .transpose-panel,
body.reading-controls-collapsed .view-options {
  display: none;
}

body.reading-controls-collapsed .controls {
  padding-block: 8px;
}

.controls button {
  min-width: 118px;
  min-height: 52px;
  font-weight: 800;
}

body.fullscreen-reading .topbar {
  padding: 8px 14px;
  gap: 10px;
}

body.fullscreen-reading .song-heading h1 {
  font-size: 1.18rem;
}

body.fullscreen-reading .song-heading p,
body.fullscreen-reading .song-reference-link {
  display: none;
}

body.fullscreen-reading .status-strip {
  gap: 6px;
}

body.fullscreen-reading .status-strip span {
  padding: 4px 7px;
  font-size: 0.78rem;
}

body.fullscreen-reading .controls {
  justify-content: center;
  gap: 6px;
  padding: 5px 10px;
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  opacity: 0.62;
  transition: opacity 160ms ease;
}

body.fullscreen-reading .controls:hover,
body.fullscreen-reading .controls:focus-within {
  opacity: 1;
}

body.fullscreen-reading .controls button {
  min-width: 0;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 7px;
  font-size: 0.78rem;
  font-weight: 750;
}

body.fullscreen-reading #themeBtn,
body.fullscreen-reading #editorBtn {
  display: none;
}

body.fullscreen-reading .viewer {
  margin-top: 8px;
}

.controls button,
.transpose-panel button,
.view-options input,
.sidebar-actions button,
.import-label {
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.04);
}

.transpose-panel div {
  min-width: 92px;
}

.transpose-panel strong {
  font-size: 1.25rem;
  color: var(--accent-strong);
}

.transpose-panel input {
  width: 64px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 8px;
}

.view-options label,
.transpose-panel label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

input[type="range"] {
  accent-color: var(--accent);
}

input[type="checkbox"] {
  accent-color: var(--accent);
}

.viewer {
  position: relative;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  margin: 22px auto;
  width: min(980px, calc(100% - 44px));
  border: 1px solid color-mix(in srgb, var(--line) 74%, transparent);
  border-radius: 4px;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.035), transparent 22px),
    var(--paper);
  box-shadow: var(--paper-shadow);
  padding: 42px 54px 72px;
  scrollbar-color: var(--accent-3) transparent;
  scrollbar-width: thin;
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
}

.autoscroll-hud {
  position: sticky;
  top: 10px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  float: right;
  margin: 0 0 12px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  padding: 8px;
  box-shadow: 0 10px 28px rgba(72, 60, 43, 0.14);
  backdrop-filter: blur(10px);
}

.hud-collapse-btn {
  font-size: 1.45rem;
}

body.autoscroll-hud-collapsed .autoscroll-hud {
  gap: 6px;
  padding: 6px;
  opacity: 0.82;
}

body.autoscroll-hud-collapsed .autoscroll-hud:hover,
body.autoscroll-hud-collapsed .autoscroll-hud:focus-within {
  opacity: 1;
}

body.autoscroll-hud-collapsed #speedDownBtn,
body.autoscroll-hud-collapsed #speedUpBtn {
  display: none;
}

body.autoscroll-hud-collapsed .hud-play {
  min-width: 42px;
  width: 42px;
  padding: 0;
}

body.autoscroll-hud-collapsed #scrollSpeedBadge {
  min-width: 38px;
}

.hud-play {
  min-height: 40px;
  min-width: 136px;
  font-weight: 850;
}

.hud-btn {
  width: 40px;
  min-height: 40px;
  padding: 0;
  font-size: 1.18rem;
  font-weight: 900;
}

#scrollSpeedBadge {
  min-width: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
  color: var(--accent-strong);
  padding: 9px 8px;
  text-align: center;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.viewer pre {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 1100px;
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 22px;
  line-height: 1.55;
  letter-spacing: 0;
  white-space: pre-wrap;
  tab-size: 4;
  text-shadow: none;
}

.sheet-music-frame {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  min-height: 72vh;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
}

.sheet-music-frame[hidden] {
  display: none;
}

.viewer-watermark {
  position: absolute;
  right: 32px;
  bottom: 26px;
  width: min(360px, 42vw);
  max-height: 260px;
  object-fit: contain;
  opacity: 0.035;
  pointer-events: none;
  filter: grayscale(1) sepia(0.35);
}

.editor-dialog {
  width: min(920px, calc(100vw - 28px));
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--text);
  box-shadow: var(--shadow);
}

.editor-dialog::backdrop {
  background: rgba(54, 47, 38, 0.45);
}

.editor header,
.editor footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}

.editor label {
  display: grid;
  gap: 6px;
  color: var(--muted);
}

.editor .wide {
  grid-column: 1 / -1;
}

.editor textarea {
  resize: vertical;
}

.dialog-note {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  body.sidebar-collapsed .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 5;
    width: min(88vw, 360px);
    transform: translateX(-105%);
    box-shadow: var(--shadow);
    transition: transform 180ms ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  body.sidebar-collapsed .sidebar {
    padding: 18px;
  }

  body.sidebar-collapsed .brand {
    flex-direction: row;
  }

  body.sidebar-collapsed .brand-logo {
    width: 58px;
    height: 58px;
  }

  body.sidebar-collapsed .brand > div,
  body.sidebar-collapsed .search-box,
  body.sidebar-collapsed .sidebar-actions,
  body.sidebar-collapsed .quick-select,
  body.sidebar-collapsed .playlist-panel,
  body.sidebar-collapsed .sidebar-status,
  body.sidebar-collapsed .song-list {
    display: initial;
  }

  body.sidebar-collapsed .search-box,
  body.sidebar-collapsed .sidebar-actions,
  body.sidebar-collapsed .playlist-panel,
  body.sidebar-collapsed .song-list {
    display: flex;
  }

  body.sidebar-collapsed .sidebar-actions {
    display: grid;
  }

  body.sidebar-collapsed .quick-select {
    display: block;
  }

  body.sidebar-collapsed .playlist-panel {
    display: grid;
  }

  body.sidebar-collapsed .sidebar-status {
    display: block;
  }

  body.sidebar-collapsed .sidebar-collapse-btn {
    display: none;
  }

  .topbar {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 12px;
  }

  .status-strip {
    grid-column: 2;
  }

  .viewer {
    width: min(900px, calc(100% - 28px));
    margin: 14px auto;
    padding: 32px 28px 56px;
  }

  .sheet-music-frame {
    min-height: 62vh;
  }

  .viewer-watermark {
    right: 12px;
    bottom: 16px;
    width: min(260px, 70vw);
  }
}

@media (max-width: 620px) {
  body {
    overflow: hidden;
  }

  .stage {
    height: 100vh;
    height: 100dvh;
    min-height: 0;
  }

  .topbar {
    padding: 10px 14px;
  }

  .song-heading h1 {
    font-size: 1.15rem;
  }

  .song-heading p {
    display: none;
  }

  .song-reference-link {
    margin-top: 3px;
    padding: 3px 8px;
    font-size: 0.76rem;
  }

  .status-strip {
    gap: 6px;
  }

  .status-strip span {
    padding: 5px 7px;
    font-size: 0.86rem;
  }

  .controls,
  .transpose-panel,
  .view-options {
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 8px 12px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  body.reading-controls-collapsed .transpose-panel,
  body.reading-controls-collapsed .view-options {
    display: none;
  }

  .controls::-webkit-scrollbar,
  .transpose-panel::-webkit-scrollbar,
  .view-options::-webkit-scrollbar {
    display: none;
  }

  .controls button {
    flex: 0 0 auto;
    min-width: 0;
    min-height: 42px;
    padding-inline: 12px;
  }

  .transpose-panel button,
  .view-options label,
  .transpose-panel label {
    flex: 0 0 auto;
  }

  .viewer {
    min-height: 240px;
    width: calc(100% - 18px);
    margin: 9px auto;
    padding: 22px 16px 64px;
  }

  .autoscroll-hud {
    top: 8px;
    float: none;
    width: 100%;
    justify-content: space-between;
    margin: 0 0 14px;
  }

  .hud-play {
    flex: 1;
    min-width: 0;
  }

  body.autoscroll-hud-collapsed .autoscroll-hud {
    width: auto;
    float: right;
    margin-left: auto;
  }

  body.autoscroll-hud-collapsed .hud-play {
    flex: 0 0 auto;
  }

  .editor-grid {
    grid-template-columns: 1fr;
  }
}