/* Tool-page-only clean dashboard skin. Landing page styles are intentionally untouched. */
:root {
  --clean-canvas: #eef1f8;
  --clean-surface: #ffffff;
  --clean-surface-soft: #f7f8fc;
  --clean-surface-tint: #f1efff;
  --clean-ink: #171923;
  --clean-muted: #73798a;
  --clean-border: rgba(39, 45, 67, 0.1);
  --clean-border-strong: rgba(39, 45, 67, 0.18);
  --clean-accent: #7157e8;
  --clean-accent-hover: #6248dd;
  --clean-accent-soft: #eeeaff;
  --clean-shadow: 0 10px 28px rgba(62, 68, 96, 0.07);
  --clean-shadow-raised: 0 12px 34px rgba(74, 64, 130, 0.12);
}

body.dark {
  --clean-canvas: #0d0f14;
  --clean-surface: #151820;
  --clean-surface-soft: #1b1f29;
  --clean-surface-tint: #25213b;
  --clean-ink: #f5f6fb;
  --clean-muted: #9ba1b2;
  --clean-border: rgba(255, 255, 255, 0.09);
  --clean-border-strong: rgba(255, 255, 255, 0.16);
  --clean-accent: #9382ff;
  --clean-accent-hover: #aa9cff;
  --clean-accent-soft: rgba(113, 87, 232, 0.18);
  --clean-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
  --clean-shadow-raised: 0 16px 40px rgba(0, 0, 0, 0.32);
}

html {
  background: var(--clean-canvas);
}

body {
  color: var(--clean-ink);
  background: var(--clean-canvas);
  font-family: Inter, "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, sans-serif;
  letter-spacing: 0;
}

body:not(.dark) {
  color: var(--clean-ink);
  background: var(--clean-canvas);
}

.ambient {
  display: none;
}

.glass,
.sidebar,
.topbar,
.detail-strip,
.instrument-panel,
.progression,
.transport,
.right-rail .rail-card,
.fret-memory-page,
.scale-page,
.training-page {
  background: var(--clean-surface);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  box-shadow: var(--clean-shadow);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

body:not(.dark) .glass {
  background: var(--clean-surface);
  border-color: var(--clean-border);
  box-shadow: var(--clean-shadow);
}

.app-shell,
body.instrument-expanded .app-shell {
  gap: 12px;
  padding: 12px;
}

body.instrument-expanded .app-shell {
  grid-template-columns: minmax(220px, 232px) minmax(0, 1fr) minmax(238px, 252px);
}

body.instrument-expanded .workspace {
  gap: 12px;
  grid-template-rows: auto auto auto minmax(404px, auto) !important;
}

body.instrument-expanded .sidebar,
body.instrument-expanded .right-rail {
  top: 12px;
  height: calc(100vh - 24px);
  min-height: 540px;
  max-height: calc(100vh - 24px);
}

body.instrument-expanded .sidebar {
  padding: 15px;
}

body.instrument-expanded .right-rail {
  padding-right: 2px;
}

.sidebar {
  border-color: rgba(255, 255, 255, 0.8);
}

.brand {
  gap: 10px;
  margin-bottom: 16px;
  padding: 0 2px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  background: var(--clean-surface-soft);
  box-shadow: none;
}

.brand p,
.eyebrow,
.section-label,
.filter-group-title small,
.select-pill > span {
  color: var(--clean-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
}

.brand h1 {
  color: var(--clean-ink);
  font-size: 20px;
  font-weight: 650;
  line-height: 1.15;
}

.app-tabs,
.library-tabs {
  gap: 6px;
  padding: 0;
  background: transparent;
  border: 0;
}

.app-tabs {
  margin-bottom: 14px;
}

.app-tab,
.nav-tab {
  min-height: 38px;
  padding: 7px 10px;
  color: #656b7b;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  box-shadow: none;
  font-size: 13px;
  font-weight: 550;
  line-height: 1.25;
  text-shadow: none;
}

body.dark .app-tab,
body.dark .nav-tab {
  color: #b5bac7;
}

.app-tab:hover,
.nav-tab:hover {
  color: var(--clean-ink);
  background: var(--clean-surface-soft);
  border-color: var(--clean-border);
}

.app-tab.active,
.nav-tab.active {
  color: var(--clean-accent);
  background: var(--clean-accent-soft);
  border-color: rgba(113, 87, 232, 0.18);
  box-shadow: none;
}

.library-tabs {
  margin-bottom: 12px;
}

.search {
  gap: 6px;
  color: var(--clean-muted);
  font-size: 11px;
}

.search-control input,
.compact-input,
.compact-select,
select {
  color: var(--clean-ink);
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
}

.search-control input {
  height: 40px;
  padding: 0 36px 0 12px;
  font-size: 12px;
}

.search-control input:hover {
  border-color: var(--clean-border-strong);
}

.search-control input:focus,
.compact-input:focus,
.compact-select:focus,
select:focus {
  border-color: rgba(113, 87, 232, 0.55);
  outline: 3px solid rgba(113, 87, 232, 0.1);
}

.search-icon {
  color: var(--clean-muted);
}

.filter-board {
  gap: 0;
  margin: 12px 0 8px;
  padding: 0 3px 0 0;
  background: transparent;
  border: 0;
}

.filter-group {
  gap: 8px;
  padding: 12px 0;
  background: transparent !important;
  border: 0 !important;
  border-bottom: 1px solid var(--clean-border) !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}

.filter-group:first-child {
  padding-top: 2px;
}

.filter-group:last-child {
  border-bottom: 0 !important;
}

.filter-group-title {
  color: var(--clean-ink);
  font-size: 12px;
  font-weight: 650;
}

.filter-group-title small {
  color: var(--clean-muted) !important;
}

.filter-chip {
  min-height: 29px;
  padding: 4px 6px;
  color: #555c6d;
  background: var(--clean-surface-soft);
  border: 1px solid transparent;
  border-radius: 6px;
  box-shadow: none;
  font-size: 11px;
}

body.dark .filter-chip {
  color: #c4c8d2;
}

.filter-chip:hover {
  color: var(--clean-ink);
  border-color: var(--clean-border-strong);
  background: var(--clean-surface);
}

.filter-group .filter-chip.active {
  color: #fff;
  background: var(--clean-accent);
  border-color: var(--clean-accent);
  box-shadow: 0 5px 12px rgba(113, 87, 232, 0.18);
}

.library-header {
  padding-top: 10px;
  border-top: 1px solid var(--clean-border);
}

.library-header-actions {
  gap: 6px;
}

button,
input,
select {
  font: inherit;
}

.ghost-btn,
.secondary-btn,
.icon-btn,
.instrument-tab,
.fret-mode,
.piano-key-mode,
.guitar-string-mode,
.bass-string-mode,
.fret-count-mode,
.handedness-mode,
.overlay-mode,
.rail-tab,
.mode-btn,
.play-mode,
.tiny-btn {
  min-height: 34px;
  color: #555c6d;
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
  font-weight: 550;
  text-shadow: none;
}

body.dark :is(.ghost-btn, .secondary-btn, .icon-btn, .instrument-tab, .fret-mode, .piano-key-mode, .guitar-string-mode, .bass-string-mode, .fret-count-mode, .handedness-mode, .overlay-mode, .rail-tab, .mode-btn, .play-mode, .tiny-btn) {
  color: #c4c8d2;
}

.secondary-btn,
.primary-btn,
.save-btn,
.transport .primary-btn {
  color: #fff;
  background: var(--clean-accent);
  border-color: var(--clean-accent);
  box-shadow: 0 7px 16px rgba(113, 87, 232, 0.18);
}

.secondary-btn:hover,
.primary-btn:hover,
.save-btn:hover,
.transport .primary-btn:hover {
  color: #fff;
  background: var(--clean-accent-hover);
  border-color: var(--clean-accent-hover);
}

.topbar {
  min-height: 68px;
  padding: 12px 16px;
}

.chord-title h2 {
  color: var(--clean-ink);
  font-size: 38px;
  font-weight: 650;
  line-height: 1;
}

.quality-badge {
  color: var(--clean-accent);
  background: var(--clean-accent-soft);
  border: 1px solid rgba(113, 87, 232, 0.12);
  border-radius: 999px;
  box-shadow: none;
}

.star-btn {
  color: #9297a5;
  background: transparent;
}

.top-actions {
  gap: 7px;
}

.select-pill select,
.icon-btn {
  height: 38px;
}

.icon-btn {
  padding: 0 12px;
}

.detail-strip {
  min-height: 128px !important;
  padding: 16px;
  gap: 0;
}

body.instrument-expanded .detail-strip {
  min-height: 128px;
  grid-template-columns: minmax(140px, 1fr) minmax(135px, 0.9fr) minmax(110px, 0.7fr) minmax(210px, 1.35fr);
}

.detail-strip > div {
  min-width: 0;
  padding: 0 14px;
  border-right: 1px solid var(--clean-border);
}

.detail-strip > div:first-child {
  padding-left: 0;
}

.detail-strip > div:last-child {
  padding-right: 0;
  border-right: 0;
}

.note-row,
.degree-row {
  gap: 7px;
}

.note-btn,
.degree-row span {
  color: var(--clean-ink);
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 7px;
  box-shadow: none;
}

.note-btn:hover,
.note-btn.active {
  color: var(--clean-accent);
  background: var(--clean-accent-soft);
  border-color: rgba(113, 87, 232, 0.25);
}

.formula-text {
  color: var(--clean-ink);
  font-size: 23px;
  font-weight: 650;
  white-space: nowrap;
}

.color-copy p:last-child {
  color: #3f4555;
  font-size: 13px;
  line-height: 1.55;
}

body.dark .color-copy p:last-child {
  color: #d7dae3;
}

.progression,
.instrument-panel {
  padding: 14px 16px;
}

body.instrument-expanded .progression {
  min-height: 58px;
}

body.instrument-expanded:not(.progression-collapsed) .progression {
  min-height: 190px;
}

.panel-title {
  gap: 12px;
}

.panel-title h3,
.right-rail h3 {
  color: var(--clean-ink);
  font-size: 18px;
  font-weight: 650;
}

.mini-actions {
  gap: 6px;
}

.timeline {
  background: var(--clean-surface-soft);
  border: 0;
  border-radius: 8px;
}

.bar-ruler {
  color: var(--clean-muted);
  border-color: var(--clean-border);
}

.progression-chip {
  background: var(--clean-surface);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
}

.progression-chip.active,
.progression-chip:hover {
  border-color: rgba(113, 87, 232, 0.42);
  box-shadow: 0 8px 18px rgba(113, 87, 232, 0.1);
}

body.instrument-expanded .instrument-panel {
  min-height: 404px;
  padding: 14px 16px;
}

.instrument-tools {
  gap: 7px;
  padding: 10px 0 12px;
  border-bottom: 1px solid var(--clean-border);
}

.segmented {
  gap: 3px;
  padding: 3px;
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
}

.segmented > button,
.instrument-tabs > button {
  min-height: 32px;
  background: transparent;
  border-color: transparent;
  border-radius: 6px;
}

:is(.instrument-tab, .fret-mode, .piano-key-mode, .guitar-string-mode, .bass-string-mode, .fret-count-mode, .handedness-mode, .overlay-mode).active {
  color: var(--clean-accent);
  background: var(--clean-surface);
  border-color: var(--clean-border);
  box-shadow: 0 3px 10px rgba(62, 68, 96, 0.08);
}

#instrumentHint {
  color: var(--clean-muted);
}

.instrument-view {
  margin-top: 12px;
  border-radius: 8px;
}

.arpeggio-panel {
  margin-top: 10px;
  background: var(--clean-surface-soft);
  border-color: var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
}

.right-rail {
  gap: 12px;
}

.right-rail .rail-card {
  margin: 0;
  padding: 14px;
}

.right-rail .rail-tabs {
  gap: 4px;
  padding: 3px;
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
}

.right-rail .rail-tab {
  border-color: transparent;
  background: transparent;
}

.right-rail .rail-tab.active {
  color: var(--clean-accent);
  background: var(--clean-surface);
  border-color: var(--clean-border);
  box-shadow: 0 3px 9px rgba(62, 68, 96, 0.08);
}

.custom-detected,
.fret-detect-status,
.midi-connect {
  background: var(--clean-surface-soft);
  border-color: var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
}

.custom-detected strong,
.fret-detect-card strong {
  color: var(--clean-ink);
}

.note-picker button {
  min-height: 36px;
  color: #545b6c;
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 7px;
  box-shadow: none;
}

body.dark .note-picker button {
  color: #c6cad4;
}

.note-picker button:hover,
.note-picker button.active {
  color: var(--clean-accent);
  background: var(--clean-accent-soft);
  border-color: rgba(113, 87, 232, 0.32);
}

.custom-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.custom-actions #customName {
  grid-column: 1 / -1;
  width: 100%;
  min-width: 0;
  height: 38px;
  padding: 0 11px;
  color: var(--clean-ink);
  background: var(--clean-surface-soft);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
}

.custom-actions #saveCustom {
  grid-column: 1 / -1;
}

.custom-actions button,
.reverse-actions button {
  min-width: 0;
  white-space: nowrap;
}

.reverse-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.reverse-actions #clearFretSelection {
  grid-column: 1 / -1;
}

.dashed-btn {
  min-height: 38px;
  color: var(--clean-accent);
  background: var(--clean-surface-soft);
  border: 1px dashed rgba(113, 87, 232, 0.32);
  border-radius: 8px;
  box-shadow: none;
}

.sidebar,
.right-rail,
.filter-board,
.chord-picker-list {
  scrollbar-width: thin;
  scrollbar-color: rgba(113, 87, 232, 0.28) transparent;
}

.right-rail p,
.right-rail small,
.export-status {
  color: var(--clean-muted);
}

.transport {
  min-height: 56px;
  padding: 10px 12px;
}

body.instrument-expanded .transport {
  gap: 8px;
}

.transport-head {
  min-width: 0;
}

.transport-body {
  gap: 8px;
}

.transport .primary-btn {
  min-height: 38px;
  padding: 0 16px;
  border-radius: 8px;
}

.toggle-line,
.volume-line,
.number-stepper {
  color: var(--clean-muted);
}

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

.chord-picker-overlay[hidden] {
  display: none;
}

.chord-picker-backdrop {
  background: rgba(22, 24, 34, 0.28);
  backdrop-filter: blur(3px);
}

.chord-picker-dialog {
  width: min(720px, calc(100vw - 32px));
  max-height: min(720px, calc(100vh - 40px));
  padding: 18px;
  color: var(--clean-ink);
  background: var(--clean-surface);
  border: 1px solid var(--clean-border);
  border-radius: 8px;
  box-shadow: var(--clean-shadow-raised);
}

.chord-picker-titlebar {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--clean-border);
}

.chord-picker-titlebar h2 {
  color: var(--clean-ink);
  font-size: 20px;
}

.chord-picker-list {
  gap: 7px;
  padding-top: 12px;
}

.chord-item {
  color: var(--clean-ink);
  background: var(--clean-surface-soft);
  border: 1px solid transparent;
  border-radius: 7px;
  box-shadow: none;
}

.chord-item:hover,
.chord-item.active {
  background: var(--clean-accent-soft);
  border-color: rgba(113, 87, 232, 0.28);
  box-shadow: none;
}

.fret-memory-page,
.scale-page,
.training-page {
  padding: 18px;
}

.fret-side-card,
.scale-side-card,
.training-side-card,
.training-card,
.scale-card,
.review-card,
.lesson-card {
  background: var(--clean-surface-soft);
  border-color: var(--clean-border);
  border-radius: 8px;
  box-shadow: none;
}

:where(button, input, select, .chord-item, .progression-chip) {
  transition:
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
.chord-item:focus-visible {
  outline: 3px solid rgba(113, 87, 232, 0.16);
  outline-offset: 2px;
}

@media (hover: hover) {
  :is(.ghost-btn, .secondary-btn, .icon-btn, .instrument-tab, .fret-mode, .piano-key-mode, .guitar-string-mode, .bass-string-mode, .fret-count-mode, .handedness-mode, .overlay-mode, .rail-tab, .mode-btn, .play-mode, .tiny-btn):hover {
    color: var(--clean-ink);
    background: var(--clean-surface);
    border-color: var(--clean-border-strong);
    box-shadow: 0 6px 14px rgba(62, 68, 96, 0.08);
    transform: translateY(-1px);
  }

  :is(.secondary-btn, .primary-btn, .save-btn):hover {
    color: #fff;
    background: var(--clean-accent-hover);
  }
}

button:active:not(:disabled),
.chord-item:active {
  transform: scale(0.98);
}

/* Premium instrument stage: visual-only layers over the existing interactive DOM. */
.instrument-view {
  position: relative;
  isolation: isolate;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background:
    radial-gradient(circle at 50% -30%, rgba(121, 103, 224, 0.16), transparent 48%),
    linear-gradient(180deg, #17191f 0%, #0b0d11 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -24px 46px rgba(0, 0, 0, 0.32),
    0 18px 34px rgba(20, 24, 34, 0.18);
  contain: layout paint;
  overflow: hidden;
}

.instrument-view::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(105deg, transparent 0 36%, rgba(255, 255, 255, 0.035) 44%, transparent 54%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), transparent 22%);
  pointer-events: none;
}

.instrument-view > :is(.piano, .fretboard) {
  position: relative;
  z-index: 1;
  margin: 0;
}

/* Piano: real key textures stay interactive; the shell supplies the 2.5D cabinet. */
.instrument-view > .piano {
  height: 316px;
  padding: 42px 14px 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  background:
    linear-gradient(180deg, #26282d 0 18px, #0a0b0e 18px 42px, transparent 42px),
    linear-gradient(90deg, #111318, #262930 10%, #15171b 50%, #272a30 90%, #0b0d10);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 18px 24px rgba(255, 255, 255, 0.035),
    inset 0 -20px 28px rgba(0, 0, 0, 0.65),
    0 16px 26px rgba(0, 0, 0, 0.34);
}

.instrument-view > .piano.is-scrollable {
  height: 336px;
}

.instrument-view > .piano::before {
  content: "";
  position: absolute;
  top: 16px;
  right: 14px;
  left: 14px;
  z-index: 6;
  height: 25px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  background: linear-gradient(180deg, #30333a, #0c0e12 72%);
  box-shadow: 0 8px 14px rgba(0, 0, 0, 0.46);
  pointer-events: none;
}

.instrument-view > .piano::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 5px;
  left: 10px;
  z-index: 7;
  height: 16px;
  border-radius: 0 0 5px 5px;
  background: linear-gradient(180deg, #191b20, #050608);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 -5px 10px rgba(0, 0, 0, 0.34);
  pointer-events: none;
}

.instrument-view .piano-keybed {
  z-index: 2;
  border-top: 2px solid #050608;
  border-right: 4px solid #08090c;
  border-left: 4px solid #08090c;
  box-shadow:
    0 -8px 16px rgba(0, 0, 0, 0.52),
    0 12px 18px rgba(0, 0, 0, 0.34);
}

.instrument-view .white-key {
  border-color: rgba(26, 28, 33, 0.42);
  border-radius: 0 0 5px 5px;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.13), transparent 12%, transparent 84%, rgba(0, 0, 0, 0.16)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.84), rgba(207, 204, 197, 0.76)),
    url("../assets/piano-ivory-key.png");
  background-size: auto, auto, 100% 100%;
  box-shadow:
    inset 0 -18px 22px rgba(61, 62, 67, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.94),
    1px 2px 3px rgba(0, 0, 0, 0.24);
}

.instrument-view .black-key {
  border-color: rgba(0, 0, 0, 0.88);
  border-radius: 0 0 5px 5px;
  background:
    linear-gradient(105deg, rgba(255, 255, 255, 0.22), transparent 26%, rgba(0, 0, 0, 0.62)),
    url("../assets/piano-ebony-key.png");
  background-size: auto, 100% 100%;
  box-shadow:
    0 10px 12px rgba(0, 0, 0, 0.52),
    inset 0 -12px 16px rgba(255, 255, 255, 0.075),
    inset 1px 0 0 rgba(255, 255, 255, 0.24);
}

.instrument-view .white-key.hit {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--note-glow, #aaa3ff) 76%, white), var(--note-color, #7567dd)),
    url("../assets/piano-ivory-key.png");
  background-size: auto, 100% 100%;
  filter: saturate(0.9);
  box-shadow:
    inset 0 -14px 20px rgba(8, 14, 32, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 0 0 1px color-mix(in srgb, var(--note-color, #7567dd) 70%, white),
    0 0 22px color-mix(in srgb, var(--note-color, #7567dd) 36%, transparent);
}

.instrument-view .black-key.hit {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--note-glow, #aaa3ff) 64%, #17191f), var(--note-color, #7567dd)),
    url("../assets/piano-ebony-key.png");
  background-size: auto, 100% 100%;
  filter: saturate(0.9);
  box-shadow:
    inset 0 -14px 20px rgba(8, 14, 32, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 0 0 1px color-mix(in srgb, var(--note-color, #7567dd) 70%, white),
    0 0 22px color-mix(in srgb, var(--note-color, #7567dd) 36%, transparent);
}

/* Fretboards: bitmap wood below, CSS hardware in the middle, note buttons above. */
.fretboard {
  --fret-metal-dark: rgba(42, 45, 49, 0.88);
  --fret-metal-light: rgba(239, 241, 242, 0.8);
  --string-top: rgba(255, 255, 255, 0.98);
  --string-core: rgba(174, 180, 187, 0.96);
  --string-shadow: rgba(0, 0, 0, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), transparent 14%, rgba(0, 0, 0, 0.42)),
    linear-gradient(90deg, rgba(0, 0, 0, 0.22), transparent 10%, transparent 88%, rgba(0, 0, 0, 0.46)),
    linear-gradient(rgba(8, 10, 14, 0.34), rgba(8, 10, 14, 0.34)),
    url("../assets/bass-ebony-fretboard.png") center / cover no-repeat;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 20px 24px rgba(255, 255, 255, 0.035),
    inset 0 -24px 30px rgba(0, 0, 0, 0.52),
    inset 14px 0 18px rgba(0, 0, 0, 0.32),
    inset -14px 0 18px rgba(0, 0, 0, 0.28),
    0 14px 24px rgba(0, 0, 0, 0.32);
}

.instrument-view > .fretboard {
  height: clamp(286px, 30vw, 354px);
}

.fretboard.is-bass {
  --fret-metal-dark: rgba(62, 48, 37, 0.88);
  --fret-metal-light: rgba(241, 219, 188, 0.78);
  background:
    linear-gradient(180deg, rgba(255, 238, 216, 0.1), transparent 14%, rgba(22, 8, 2, 0.38)),
    linear-gradient(90deg, rgba(25, 8, 2, 0.2), transparent 10%, transparent 88%, rgba(24, 8, 2, 0.42)),
    linear-gradient(rgba(47, 20, 7, 0.18), rgba(47, 20, 7, 0.18)),
    url("../assets/guitar-rosewood-fretboard.png") center / cover no-repeat;
}

.instrument-view > .fretboard.is-bass {
  height: clamp(260px, 27vw, 322px);
}

.fretboard::after {
  z-index: 2;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.13), transparent 10%, transparent 88%, rgba(0, 0, 0, 0.42)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045), transparent 7%, transparent 93%, rgba(0, 0, 0, 0.32));
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.055),
    inset 0 0 34px rgba(0, 0, 0, 0.34);
}

.string-row {
  z-index: 5;
}

.string-row::before {
  z-index: 9;
  height: calc(var(--string-size, 2px) * 1.06);
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px 7px),
    linear-gradient(180deg, #ffffff 0%, var(--string-top) 18%, var(--string-core) 42%, #565d65 49%, #d8dde1 60%, #5d6269 100%);
  box-shadow:
    0 1px 2px var(--string-shadow),
    0 -1px 1px rgba(255, 255, 255, 0.32),
    0 0 calc(var(--string-size, 2px) * 0.9) rgba(255, 255, 255, 0.14);
}

.fret {
  z-index: 3;
  border-left-width: 2px;
  border-image: linear-gradient(90deg, var(--fret-metal-dark), var(--fret-metal-light) 44%, rgba(116, 121, 128, 0.62) 72%, rgba(20, 22, 25, 0.82)) 1;
  box-shadow:
    inset 1px 0 0 rgba(255, 255, 255, 0.18),
    inset -1px 0 0 rgba(0, 0, 0, 0.3);
}

.fret.marker::before {
  width: 10px;
  height: 10px;
  background: rgba(224, 226, 228, 0.34);
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.46),
    inset 0 1px 1px rgba(255, 255, 255, 0.46);
}

.fret.hit::after,
.fret.scale-overlay-tone::after,
.fret.reverse-selected::after {
  min-width: 38px;
  height: 38px;
  border-width: 1px;
  border-color: rgba(255, 255, 255, 0.84);
  font-weight: 750;
  background:
    radial-gradient(circle at 34% 24%, rgba(255, 255, 255, 0.78), transparent 18%),
    radial-gradient(circle at 36% 28%, var(--note-glow, #aaa3ff), var(--note-color, #7567dd) 72%);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.14),
    0 5px 10px rgba(0, 0, 0, 0.38),
    0 0 18px color-mix(in srgb, var(--note-color, #7567dd) 38%, transparent);
}

.fret.root-tone::after,
.string-name.root-tone {
  outline-width: 2px;
  outline-color: rgba(255, 255, 255, 0.82);
  outline-offset: 3px;
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--note-color, #7567dd) 22%, transparent),
    0 0 25px color-mix(in srgb, var(--note-color, #7567dd) 52%, transparent);
}

.fret-number-row {
  color: rgba(224, 228, 235, 0.62);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.68);
}

@media (hover: hover) {
  .instrument-view .playable-note:hover,
  .fretboard [data-fret-position]:hover {
    filter: brightness(1.08) saturate(1.04);
  }

  .fretboard .fret:hover::after {
    transform: scale(1.07);
  }
}

@media (max-width: 1100px) and (min-width: 761px) {
  body.instrument-expanded .app-shell {
    grid-template-columns: minmax(210px, 220px) minmax(0, 1fr);
  }

  body.instrument-expanded .right-rail {
    gap: 12px;
  }
}

@media (max-width: 760px) {
  .app-shell,
  body.instrument-expanded .app-shell {
    gap: 10px;
    padding: 8px;
  }

  body.instrument-expanded .sidebar {
    padding: 12px;
  }

  body.instrument-expanded #chordSidebarContent {
    min-height: 0;
  }

  .filter-board {
    max-height: 320px !important;
  }

  .topbar,
  .detail-strip,
  .progression,
  .instrument-panel {
    padding: 12px;
  }

  .topbar {
    align-items: flex-start;
  }

  .chord-title h2 {
    font-size: 34px;
  }

  .detail-strip > div {
    padding: 10px 0;
    border-right: 0;
    border-bottom: 1px solid var(--clean-border);
  }

  .detail-strip > div:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  body.instrument-expanded .instrument-panel {
    min-height: 360px;
  }

  .instrument-tools {
    align-items: flex-start;
  }

  .instrument-view {
    padding: 6px;
  }

  .instrument-view > .piano,
  .instrument-view > .piano.is-scrollable {
    height: 276px;
    padding: 36px 8px 16px;
  }

  .instrument-view > .piano::before {
    top: 12px;
    right: 8px;
    left: 8px;
    height: 23px;
  }

  .instrument-view > .fretboard,
  .instrument-view > .fretboard.is-bass {
    height: 252px;
    min-height: 252px;
  }

  .fret.hit::after,
  .fret.scale-overlay-tone::after,
  .fret.reverse-selected::after {
    min-width: 34px;
    height: 34px;
    font-size: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  :where(button, input, select, .chord-item, .progression-chip, .instrument-view .playable-note, .fretboard .fret::after) {
    transition: none !important;
  }
}