/* Resonance Piano — design tokens (light default) */
:root {
  color-scheme: light;
  --bg: #f6f4ef;
  --bg-elevated: #ffffff;
  --bg-sidebar: #fffdf9;
  --text: #1c1917;
  --text-muted: #78716c;
  --text-inverse: #ffffff;
  --color-primary: #0d9488;
  --accent: var(--color-primary);
  --color-guide-white: #ffffff;
  --color-guide-black: #1c1917;
  --color-key-white: #fefefe;
  --color-key-black: #1c1917;
  --accent-hover: color-mix(in srgb, var(--accent), black 18%);
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --accent-border: color-mix(in srgb, var(--accent) 30%, transparent);
  --warm: #f59e0b;
  --record: #e11d48;
  --record-glow: rgba(225, 29, 72, 0.4);
  --danger-soft: rgba(225, 29, 72, 0.1);
  --border-subtle: rgba(28, 25, 23, 0.06);
  --border: rgba(28, 25, 23, 0.1);
  --border-strong: rgba(28, 25, 23, 0.12);
  --surface-inset: rgba(28, 25, 23, 0.08);
  --body-glow: color-mix(in srgb, var(--accent) 8%, transparent);
  --btn-solid-bg: #1c1917;
  --btn-solid-hover: #292524;
  --white-key: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-key-white), white 6%) 0%,
    color-mix(in srgb, var(--color-key-white), black 8%) 55%,
    color-mix(in srgb, var(--color-key-white), black 14%) 100%
  );
  --white-key-hover: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-key-white), white 10%) 0%,
    color-mix(in srgb, var(--color-key-white), black 4%) 100%
  );
  --white-key-active: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 22%, var(--color-key-white)) 0%,
    color-mix(in srgb, var(--accent) 42%, var(--color-key-white)) 100%
  );
  --black-key: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-key-black), white 18%) 0%,
    var(--color-key-black) 100%
  );
  --black-key-active: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent), black 35%) 0%,
    color-mix(in srgb, var(--accent), black 18%) 100%
  );
  --black-key-shadow: rgba(0, 0, 0, 0.35);
  --black-key-label: rgba(255, 255, 255, 0.55);
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.06);
  --shadow-md: 0 8px 24px rgba(28, 25, 23, 0.08);
  --shadow-key: 0 4px 0 #d6d3d1, 0 6px 12px rgba(28, 25, 23, 0.08);
  --shadow-key-active: 0 1px 0 #d6d3d1,
    inset 0 2px 8px color-mix(in srgb, var(--accent) 25%, transparent);
  --falling-white: linear-gradient(
    180deg,
    var(--color-guide-white) 0%,
    color-mix(in srgb, var(--color-guide-white), black 14%) 100%
  );
  --falling-black: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-guide-black), white 14%) 0%,
    var(--color-guide-black) 100%
  );
  --falling-shadow: rgba(28, 25, 23, 0.15);
  --scrollbar: #d6d3d1;
  --radius: 12px;
  --radius-lg: 20px;
  --font: "DM Sans", system-ui, sans-serif;
  --key-white-h: clamp(120px, 18vw, 180px);
  --key-white-w: clamp(28px, 3.5vw, 46px);
  --transition: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-panel: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-theme: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c0a09;
  --bg-elevated: #1c1917;
  --bg-sidebar: #141210;
  --text: #fafaf9;
  --text-muted: #a8a29e;
  --text-inverse: #1c1917;
  --accent-hover: color-mix(in srgb, var(--accent), white 22%);
  --accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --accent-border: color-mix(in srgb, var(--accent) 35%, transparent);
  --record-glow: rgba(251, 113, 133, 0.45);
  --danger-soft: rgba(251, 113, 133, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.14);
  --surface-inset: rgba(255, 255, 255, 0.08);
  --body-glow: color-mix(in srgb, var(--accent) 7%, transparent);
  --btn-solid-bg: #fafaf9;
  --btn-solid-hover: #e7e5e4;
  --color-guide-white: #fafaf9;
  --color-guide-black: #292524;
  --color-key-white: #f5f5f4;
  --color-key-black: #1c1917;
  --white-key-active: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 55%, var(--color-key-white)) 0%,
    color-mix(in srgb, var(--accent) 72%, var(--color-key-black)) 100%
  );
  --black-key-shadow: rgba(0, 0, 0, 0.55);
  --black-key-label: rgba(255, 255, 255, 0.6);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-key: 0 4px 0 #0c0a09, 0 6px 12px rgba(0, 0, 0, 0.4);
  --shadow-key-active: 0 1px 0 #0c0a09,
    inset 0 2px 8px color-mix(in srgb, var(--accent) 35%, transparent);
  --falling-shadow: rgba(0, 0, 0, 0.4);
  --scrollbar: #44403c;
}

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

html {
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--body-glow), transparent),
    var(--bg);
  transition:
    background-color var(--transition-theme),
    color var(--transition-theme);
}

.piano-section,
.sidebar,
.toolbar__group,
.recording-item,
.song-chrome,
.btn--record,
.btn--secondary {
  transition:
    background-color var(--transition-theme),
    color var(--transition-theme),
    border-color var(--transition-theme),
    box-shadow var(--transition-theme);
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 2rem;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Header */
.header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.brand__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--radius);
}

.brand__title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand__tagline {
  margin: 0.15rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.toolbar__group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-subtle);
}

.toolbar__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 4.5rem;
  text-align: center;
}

.toolbar__toggles {
  gap: 0.35rem;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  border-radius: 8px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  color: var(--text);
}

.btn--icon:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.btn--toggle {
  padding: 0.45rem 0.75rem;
  background: transparent;
  color: var(--text-muted);
}

.btn--toggle[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}

.btn--record {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--btn-solid-bg);
  color: var(--text-inverse);
}

.btn--record:hover {
  background: var(--btn-solid-hover);
}

.btn--record[aria-pressed="true"] {
  background: var(--record);
  animation: pulse-record 1.5s ease-in-out infinite;
}

@keyframes pulse-record {
  0%, 100% { box-shadow: 0 0 0 0 var(--record-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}

.record-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.btn--record[aria-pressed="true"] .record-dot {
  background: var(--text-inverse);
}

.btn--secondary {
  padding: 0.5rem 0.875rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn--secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Range */
.control--range {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.control--range input[type="range"] {
  width: 100px;
  height: 6px;
  accent-color: var(--accent);
  cursor: pointer;
}

.control--color {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control--color input[type="color"] {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

.control--color input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.control--color input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

.control--color input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 4px;
}

.color-settings {
  position: relative;
}

.color-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 50;
  width: min(17.5rem, calc(100vw - 2rem));
  padding: 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.color-panel__title {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.color-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.color-panel__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.color-panel__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  min-width: 0;
}

.color-panel__row input[type="color"] {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  padding: 0;
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

.color-panel__row input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.color-panel__row input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

.color-panel__row input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 4px;
}

.color-panel__reset {
  width: 100%;
  margin-top: 0.65rem;
  padding: 0.45rem 0.75rem;
  font-size: 0.75rem;
}

/* Main layout */
.main {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 280px);
  gap: 1.5rem;
  flex: 1;
  align-items: start;
}

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }
}

/* Piano */
.piano-section {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
}

.piano-section.has-active-guide {
  display: flex;
  flex-direction: column;
  min-height: min(84dvh, calc(100dvh - 9.5rem));
}

.piano-section.has-guide-open {
  display: flex;
  flex-direction: column;
  min-height: min(72dvh, calc(100dvh - 11rem));
}

.piano-section.has-active-guide .piano-wrap,
.piano-section.has-guide-open .piano-wrap {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.piano-section.has-active-guide .piano-scroll,
.piano-section.has-guide-open .piano-scroll {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* Song controls + timeline — fixed above scroll area */
.song-chrome {
  padding: 0.75rem 1rem 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
  max-height: 13rem;
  opacity: 1;
  transition:
    max-height var(--transition-panel),
    opacity var(--transition-panel),
    padding var(--transition-panel),
    border-color var(--transition-panel);
}

.song-chrome.is-collapsed:not(.is-hiding) {
  max-height: 2.85rem;
}

.song-chrome.is-hiding {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-bottom-color: transparent;
  pointer-events: none;
}

.song-chrome.is-collapsed .note-guide__head {
  margin-bottom: 0;
}

.song-chrome[hidden] {
  display: none !important;
}

.note-lane-host[hidden] {
  display: none !important;
}

.note-guide__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 28px;
  margin-bottom: 0.35rem;
}

.note-guide__actions {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-shrink: 0;
}

.note-guide-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 28px;
  padding: 0.5rem 1rem 0.35rem;
  border-bottom: 1px solid var(--border-subtle);
}

.note-guide-bar.is-collapsed {
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
  cursor: pointer;
}

.note-guide-bar.is-collapsed:hover {
  background: color-mix(in srgb, var(--accent) 6%, transparent);
}

.note-guide-bar.is-expanded .note-guide-bar__open {
  display: none;
}

.note-guide-bar.is-collapsed .note-guide-bar__close {
  display: none;
}

.note-guide-bar.is-collapsed .note-guide-bar__open {
  display: inline-flex;
}

.note-guide-bar[hidden] {
  display: none !important;
}

/* Song chrome already shows the title — hide the idle "Note guide" row while a song plays */
.piano-section:has(.song-chrome:not([hidden])) .note-guide-bar {
  display: none !important;
}

.note-guide-edge {
  position: relative;
  z-index: 5;
  flex-shrink: 0;
  width: 100%;
  min-width: min-content;
  height: 3px;
  margin: 0;
  background: var(--accent);
  opacity: 0.9;
  pointer-events: none;
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 45%, transparent);
}

.piano-section:not(.has-guide-open):not(.has-active-guide) .note-guide-edge {
  display: none;
}

.piano-section.has-guide-open .note-guide-edge,
.piano-section.has-active-guide .note-guide-edge,
.piano-section:has(.note-lane-host.is-live) .note-guide-edge {
  opacity: 1;
  box-shadow:
    0 0 10px color-mix(in srgb, var(--accent) 55%, transparent),
    0 0 18px color-mix(in srgb, var(--accent) 30%, transparent);
}

.note-guide-bar .note-guide__label {
  flex: 1;
  min-width: 0;
}

.note-guide-bar .btn--icon,
.note-guide__actions .btn--icon {
  color: var(--text-muted);
}

.note-guide-bar .btn--icon:hover,
.note-guide__actions .btn--icon:hover {
  color: var(--text);
  background: var(--surface-inset);
}

.note-lane-host.is-hiding {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
  pointer-events: none;
  overflow: hidden;
  transition:
    max-height var(--transition-panel),
    opacity var(--transition-panel),
    margin-bottom var(--transition-panel);
}

.note-guide__label {
  flex: 1;
  min-width: 0;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-transport {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-shrink: 0;
}

.song-transport .btn--icon {
  color: var(--accent);
}

.song-transport .btn--icon:hover {
  background: var(--accent-soft);
}

.song-tempo {
  margin-bottom: 0.35rem;
  overflow: hidden;
  max-height: 2rem;
  opacity: 1;
  transition:
    max-height var(--transition-panel),
    opacity var(--transition-panel),
    margin-bottom var(--transition-panel);
}

.song-tempo input[type="range"] {
  flex: 1;
  min-width: 5rem;
  max-width: 9rem;
}

.song-tempo__value {
  min-width: 3.25rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.song-chrome.is-collapsed .song-tempo {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
  pointer-events: none;
}

.song-progress {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  overflow: hidden;
  max-height: 2rem;
  opacity: 1;
  transition:
    max-height var(--transition-panel),
    opacity var(--transition-panel),
    margin-bottom var(--transition-panel);
}

.song-chrome.is-collapsed .song-progress {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
  pointer-events: none;
}

.song-progress__time {
  font-size: 0.7rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  min-width: 2.25rem;
}

.song-progress__time:last-child {
  text-align: right;
}

.song-progress__track {
  flex: 1;
  height: 6px;
  background: var(--surface-inset);
  border-radius: 999px;
  overflow: hidden;
  touch-action: none;
}

.song-progress__track.is-seekable {
  cursor: pointer;
}

.song-progress__track.is-seekable:hover .song-progress__fill,
.song-progress__track.is-seekable:active .song-progress__fill {
  filter: brightness(1.08);
}

.song-progress__fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.1s linear;
}

@media (prefers-reduced-motion: reduce) {
  .song-chrome,
  .song-progress,
  .note-lane-host {
    transition: none;
  }
}

.note-lane-host {
  --note-sink: 3.25rem;
  position: relative;
  z-index: 1;
  width: 100%;
  margin-bottom: calc(0.35rem - var(--note-sink));
  padding-bottom: var(--note-sink);
  overflow: visible;
  max-height: calc(7.5rem + var(--note-sink));
  opacity: 1;
  transition:
    max-height var(--transition-panel),
    opacity var(--transition-panel),
    margin-bottom var(--transition-panel),
    min-height var(--transition-panel);
}

.piano-section.has-guide-open .note-lane::before,
.piano-section.has-active-guide .note-lane::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 6;
  background: var(--accent);
  opacity: 0.9;
  pointer-events: none;
  box-shadow:
    0 0 10px color-mix(in srgb, var(--accent) 50%, transparent),
    0 0 16px color-mix(in srgb, var(--accent) 25%, transparent);
    opacity: 0;
}

.piano-section.has-guide-open .note-lane::after,
.piano-section.has-active-guide .note-lane::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2.5rem;
  z-index: 5;
  pointer-events: none;
  background: linear-gradient(
    to bottom,
    var(--bg-elevated) 0%,
    color-mix(in srgb, var(--bg-elevated) 55%, transparent) 55%,
    transparent 100%
  );
}

.piano-section.has-active-guide .note-lane-host:not(.is-collapsed),
.piano-section.has-guide-open .note-lane-host:not(.is-collapsed) {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  max-height: none;
}

.note-lane-host.is-instant {
  transition: none !important;
}

.note-lane-host.is-instant.is-collapsed {
  max-height: none;
  opacity: 1;
  margin-bottom: calc(0.35rem - var(--note-sink));
  pointer-events: none;
}

.note-lane-host.is-collapsed {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
  pointer-events: none;
}

.note-lane {
  --note-sink: 3.25rem;
  position: relative;
  flex: 1 1 auto;
  width: 100%;
  min-height: 9rem;
  min-width: min-content;
  overflow: hidden;
  pointer-events: none;
}

.piano-section.has-active-guide .note-lane,
.piano-section.has-guide-open .note-lane {
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
}

.note-lane__notes {
  position: absolute;
  inset: 0;
  overflow: visible;
  pointer-events: none;
}

.note-lane__hit-line {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--accent);
  opacity: 0.85;
  z-index: 4;
  pointer-events: none;
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 45%, transparent);
}

@media (min-height: 720px) {
  .piano-section.has-active-guide {
    min-height: min(88dvh, calc(100dvh - 8rem));
  }

  .piano-section.has-guide-open:not(.has-active-guide) {
    min-height: min(78dvh, calc(100dvh - 10rem));
  }

  .piano-section.has-active-guide .note-lane-host:not(.is-collapsed),
  .piano-section.has-guide-open .note-lane-host:not(.is-collapsed) {
    min-height: 0;
  }
}

.falling-note {
  position: absolute;
  z-index: 1;
  border-radius: 4px;
  box-shadow: 0 2px 6px var(--falling-shadow);
  will-change: top, height;
}

.falling-note--white {
  background: var(--falling-white);
  border: 1px solid var(--border-strong);
}

.falling-note--black {
  background: var(--falling-black);
  border: 1px solid var(--black-key-shadow);
  z-index: 2;
}

.note-lane-host.is-live .note-lane__hit-line,
.piano-section.has-guide-open .note-lane__hit-line,
.piano-section.has-active-guide .note-lane__hit-line {
  opacity: 0;
}

.piano-wrap {
  overflow-x: auto;
  padding: 0.35rem 1rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}

.piano-section:has(.note-guide-bar:not([hidden])) .piano-wrap,
.piano-section.has-guide-open .piano-wrap,
.piano-section.has-active-guide .piano-wrap {
  padding-top: 0.35rem;
  padding-bottom: 0;
}

.piano-section:has(.song-chrome:not([hidden])) .piano-wrap {
  padding-top: 0.5rem;
}

.piano-scroll {
  display: flex;
  flex-direction: column;
  min-width: min-content;
  margin: 0 auto;
  overflow: visible;
}

.piano-section.has-guide-open .piano,
.piano-section.has-active-guide .piano {
  padding-bottom: 0;
}

.piano {
  display: flex;
  position: relative;
  z-index: 4;
  min-width: min-content;
  padding-bottom: 0.5rem;
}

.piano.is-input-locked {
  pointer-events: none;
  user-select: none;
}

.piano.is-input-locked .key {
  cursor: default;
}

.piano__octave {
  display: flex;
  position: relative;
}

/* Keys */
.key {
  position: relative;
  border: none;
  cursor: pointer;
  font-family: inherit;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.key--white {
  width: var(--key-white-w);
  height: var(--key-white-h);
  background: var(--white-key);
  border-radius: 0 0 6px 6px;
  box-shadow: var(--shadow-key);
  margin-right: 2px;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 0.65rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.key--white:last-child {
  margin-right: 0;
}

.key--white:hover {
  background: var(--white-key-hover);
}

.key--white.is-active,
.key--white:active {
  transform: translateY(3px);
  box-shadow: var(--shadow-key-active);
  background: var(--white-key-active);
}

.key--black {
  position: absolute;
  width: calc(var(--key-white-w) * 0.62);
  height: calc(var(--key-white-h) * 0.62);
  background: var(--black-key);
  border-radius: 0 0 4px 4px;
  box-shadow: 0 3px 6px var(--black-key-shadow);
  z-index: 2;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 0.65rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.key--black:hover {
  filter: brightness(1.15);
}

.key--black.is-active,
.key--black:active {
  transform: translateY(2px);
  background: var(--black-key-active);
}

.key__label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

.key--black .key__label {
  color: var(--black-key-label);
  font-size: 0.55rem;
}

.key__binding {
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 0.15rem;
  opacity: 0.85;
}

.piano.hide-labels .key__label,
.piano.hide-labels .key__binding {
  visibility: hidden;
}

/* Black key positions within octave (7 white keys) */
.key--black[data-offset="0"] { left: calc(var(--key-white-w) * 0.72); }
.key--black[data-offset="1"] { left: calc(var(--key-white-w) * 1.74); }
.key--black[data-offset="2"] { left: calc(var(--key-white-w) * 3.78); }
.key--black[data-offset="3"] { left: calc(var(--key-white-w) * 4.8); }
.key--black[data-offset="4"] { left: calc(var(--key-white-w) * 5.82); }

.hint {
  margin: 0;
  padding: 0.5rem 1.25rem 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
}

.piano-section.has-guide-open .hint,
.piano-section.has-active-guide .hint {
  padding-top: 0.35rem;
}

.hint kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  font-size: 0.75rem;
  font-family: inherit;
  background: var(--bg);
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Sidebar */
.sidebar {
  background: var(--bg-sidebar);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem;
  max-height: min(560px, calc(100vh - 12rem));
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  overflow-y: auto;
}

.sidebar__section {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.sidebar__section--divider {
  padding-top: 1rem;
  margin-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.sidebar__section .recording-list {
  max-height: 200px;
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.sidebar__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.sidebar__count {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}

.recording-list {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.recording-list:not(:empty) + .sidebar__empty {
  display: none;
}

.recording-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.75rem;
  background: var(--bg-elevated);
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition);
}

.recording-item:hover {
  border-color: var(--accent-border);
}

.recording-item.is-playing {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.recording-item__info {
  flex: 1;
  min-width: 0;
}

.recording-item__name {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recording-item__meta {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.recording-item__actions {
  display: flex;
  gap: 0.25rem;
}

.recording-item__actions .btn {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-muted);
}

.recording-item__actions .btn:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.recording-item__actions .btn--danger:hover {
  color: var(--record);
  background: var(--danger-soft);
}

.sidebar__empty {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Footer */
.footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer p {
  margin: 0;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.25rem;
  background: var(--btn-solid-bg);
  color: var(--text-inverse);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  z-index: 100;
  transition: opacity 0.3s, transform 0.3s;
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(8px);
  pointer-events: none;
}

.hidden {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}