:root {
  color-scheme: light;
  --font-family-base: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-bold: 700;
  --text-ui: 12px;
  --text-section: 18px;
  --control-height: 32px;
  --control-radius: 4px;
  --control-gap: 8px;
  --active-bg: #cce5ff;
  --inactive-bg: #ccc;
  --active-fill: #9cbed9;
  --bg: #fbf7ef;
  --panel: #fffdfa;
  --panel-strong: #f5efe7;
  --text: #1d1a17;
  --muted: #72695f;
  --accent: #2f5d7a;
  --accent-strong: #193b4f;
  --border: #231f1b;
  --pressed: #1d1a17;
  --pressed-border: #fdf7ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  color: var(--text);
  background: linear-gradient(135deg, #f4eadf 0%, var(--bg) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button,
input {
  font: inherit;
}

.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.2rem;
  display: grid;
  gap: 1rem;
}

.app-header,
.controls-panel,
.sequence-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.app-header {
  padding: 1.25rem 1.4rem;
}

.eyebrow {
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.73rem;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
}

.subtext {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.controls-panel {
  padding: 1rem 1.2rem;
  display: grid;
  grid-template-columns: max-content max-content;
  grid-template-areas:
    "transport transport"
    "sound rhythm";
  align-items: start;
  justify-content: start;
  column-gap: 40px;
  row-gap: 24px;
}

.top-bar {
  grid-area: transport;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.top-bar-actions:empty {
  display: none;
}

.control-section,
.fretboard-settings {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.control-section-title {
  margin: 0;
  font-size: var(--text-section);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  letter-spacing: 0;
}

.fretboard-settings {
  justify-content: flex-end;
}

.button-group {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.controller-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.duration-group {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.rhythm-row {
  grid-area: rhythm;
  display: flex;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
}

.note-length-module {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.duration-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--control-height);
  height: var(--control-height);
  border: 0;
  border-radius: var(--control-radius);
  background: var(--inactive-bg);
  color: var(--text);
  cursor: pointer;
  padding: 0.2rem;
}

.duration-btn.is-selected {
  background: var(--active-bg);
  color: var(--text);
}

.modifier-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 32px;
}

.display-mode-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.display-mode-btn {
  width: 28px;
  min-height: 24px;
  border: 0;
  border-radius: var(--control-radius);
  padding: 0;
  background: var(--inactive-bg);
  color: var(--text);
  cursor: pointer;
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.display-mode-btn.is-active {
  background: var(--active-bg);
  color: var(--text);
}

.controls-divider {
  display: block;
  width: 1px;
  height: 32px;
  background: rgba(0, 0, 0, 0.15);
  margin: 0 0.2rem;
}

.modifier-btn,
.rest-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--control-height);
  height: var(--control-height);
  border: 0;
  border-radius: var(--control-radius);
  background: var(--inactive-bg);
  color: var(--text);
  cursor: pointer;
  padding: 0.2rem;
}

.modifier-btn.is-active {
  background: var(--active-bg);
  color: var(--text);
}

.control-btn {
  min-height: var(--control-height);
  border: 0;
  border-radius: var(--control-radius);
  padding: 0 12px;
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.control-btn.primary,
.control-btn.is-active {
  background: var(--active-bg);
  color: var(--text);
}

.control-btn[aria-pressed="true"] {
  background: var(--active-bg);
  color: var(--text);
}

.sound-panel {
  grid-area: sound;
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.sound-module {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.sound-presets-module {
  min-width: 160px;
}

.sound-preset-group {
  display: flex;
  gap: 0.25rem;
}

.sound-preset-btn,
.waveform-btn {
  border: 0;
  border-radius: 4px;
  background: #ccc;
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
}

.sound-preset-btn {
  width: 24px;
  height: 24px;
  padding: 0;
}

.sound-preset-btn.is-selected,
.waveform-btn.is-selected {
  background: #cce5ff;
}

.sound-waveform-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.waveform-btn {
  min-height: 24px;
  padding: 0.25rem 0.45rem;
  font-size: 0.75rem;
}

.sound-envelope-controls {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
}

.sound-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-self: flex-start;
  margin-top: 32px;
}

.sound-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: var(--control-radius);
  background: var(--inactive-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
}

.sound-menu-btn:hover,
.sound-menu-btn[aria-expanded="true"] {
  background: var(--active-bg);
}

.sound-actions-menu {
  position: absolute;
  right: 0;
  bottom: 40px;
  z-index: 2;
  width: 120px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
  border-radius: var(--control-radius);
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.sound-actions-menu[hidden] {
  display: none;
}

.sound-actions-menu button {
  min-height: 32px;
  border: 0;
  border-radius: var(--control-radius);
  background: var(--inactive-bg);
  color: var(--text);
  cursor: pointer;
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.sound-actions-menu button:hover,
.sound-actions-menu button:focus-visible {
  background: var(--active-bg);
}

.envelope-control {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
}

.envelope-control input[type="range"] {
  width: 12px;
  height: 64px;
  margin: 0;
  accent-color: #9cbED9;
  writing-mode: vertical-lr;
  direction: rtl;
  cursor: ns-resize;
}

.envelope-control span {
  line-height: 1;
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.library-select-wrap {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.library-select {
  min-height: var(--control-height);
  border: 0;
  border-radius: var(--control-radius);
  background: var(--inactive-bg);
  color: var(--text);
  padding: 0 8px;
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.tempo-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
}

.tempo-control input {
  accent-color: var(--active-fill);
}

.compact-range {
  width: 48px;
  min-width: 48px;
}

.status-message {
  min-height: 1.4rem;
  color: var(--accent-strong);
  font-weight: 600;
  margin-bottom: 0.7rem;
}

.fretboard {
  display: grid;
  gap: 0.4rem;
  padding: 0.7rem;
  border-radius: 0.9rem;
  background: linear-gradient(90deg, #d8c8aa 0%, #e7d7b6 30%, #d8c8aa 100%);
  border: 2px solid #8d7757;
  overflow-x: auto;
}

.string-row {
  display: grid;
  grid-template-columns: repeat(22, minmax(34px, 1fr));
  gap: 0.35rem;
}

.fret-cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 2px solid var(--border);
  border-radius: 0.8rem;
  background: #fff;
  color: var(--text);
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  padding: 0.3rem;
  text-align: center;
}

.fret-cell.is-pressed {
  background: var(--pressed);
  border-color: var(--pressed-border);
  color: #fff;
}

.sequence-panel {
  position: relative;
  padding: 1rem 1.2rem;
}

.sequence-header {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.sequence-title-wrap {
  flex: 1;
  display: flex;
  justify-content: center;
}

.sequence-title-input {
  width: min(100%, 320px);
  height: 32px;
  border: 1px solid #d1cdc7;
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 700;
  text-align: center;
}

.sequence-title-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  background: #fff;
}

.sequence-actions {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sequence-fretboard {
  margin-top: 0.25rem;
  padding: 0.5rem 1rem 1.2rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.sequence-fretboard .status-message:empty {
  display: none;
}

.sequence-menu-btn {
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 4px;
  background: #ccc;
  color: var(--text);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
}

.sequence-menu-btn:hover,
.sequence-menu-btn[aria-expanded="true"] {
  background: #cce5ff;
}

.sequence-file-menu {
  position: absolute;
  top: 40px;
  right: 0;
  z-index: 2;
  width: 144px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
  border-radius: 4px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.sequence-file-menu[hidden] {
  display: none;
}

.sequence-file-menu button {
  min-height: 32px;
  border: 0;
  border-radius: 4px;
  background: #ccc;
  color: var(--text);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
}

.sequence-menu-close {
  display: none;
}

.sequence-file-menu button:hover,
.sequence-file-menu button:focus-visible {
  background: #cce5ff;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sequence-display {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.8rem;
}

.sequence-row {
  display: grid;
  grid-template-columns: 56px 1fr 56px 48px;
  gap: var(--control-gap);
  align-items: center;
  min-height: 36px;
  padding: 8px;
  background: var(--panel-strong);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 0.75rem;
  font-size: var(--text-ui);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
}

.sequence-row .note {
  color: var(--accent-strong);
}

.sequence-row.is-rest {
  opacity: 0.65;
  font-style: italic;
}

.sequence-row.is-rest .note {
  color: var(--muted);
}

.empty-state {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 700px) {
  .app-shell {
    padding: 0.75rem;
    width: 100%;
    min-width: 0;
  }

  .app-header,
  .controls-panel,
  .fretboard-panel,
  .sequence-panel,
  .top-bar,
  .control-section {
    min-width: 0;
  }

  .controls-panel {
    padding: 0.9rem;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }

  .top-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .top-bar-actions {
    justify-content: flex-start;
  }

  .controller-row {
    align-items: flex-start;
  }

  .fretboard-settings,
  .sound-panel {
    width: 100%;
  }

  .sound-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .sound-module {
    width: 100%;
  }

  .sound-waveform-group {
    max-width: 100%;
  }

  .envelope-module .sound-envelope-controls {
    justify-content: flex-start;
  }

  .sound-panel > .control-btn {
    align-self: flex-start;
  }

  .duration-group,
  .modifier-group {
    flex-wrap: wrap;
  }

  .tempo-control {
    width: 100%;
  }

  .fretboard {
    padding: 0.45rem;
  }

  .string-row {
    grid-template-columns: repeat(22, minmax(28px, 1fr));
  }

  .fret-cell {
    min-height: 42px;
    font-size: 0.74rem;
  }

  .sequence-row {
    grid-template-columns: 55px 1fr 55px 44px;
    font-size: 0.9rem;
  }

  .sequence-header {
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .sound-panel {
    gap: 1rem;
  }

  .sequence-title-input {
    min-width: 0;
    font-size: 0.95rem;
  }

  .sequence-title-wrap {
    min-width: 0;
  }

  .sequence-actions {
    margin-left: auto;
  }

  .sequence-file-menu {
    position: fixed;
    inset: 0;
    width: 100%;
    min-height: 100dvh;
    align-items: stretch;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    border-radius: 0;
    background: var(--panel);
    box-shadow: none;
  }

  .sequence-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: flex-end;
    width: 32px;
    min-height: 32px;
    margin-bottom: 1rem;
    background: transparent !important;
    font-size: 1.25rem !important;
  }

  .sequence-file-menu button[role="menuitem"] {
    width: 100%;
    min-height: 48px;
    font-size: 1rem;
  }
}