/* ========================================================
   DIETER RAMS / BRAUN INDUSTRIAL DESIGN SYSTEM
   TG-07 POLYPHONIC GLIDE INSTRUMENT
   "WENIGER, ABER BESSER" (LESS, BUT BETTER)
   ======================================================== */
:root {
  --chassis-bg: #e6e3db;
  --chassis-panel: #dcd8ce;
  --chassis-well: #cfcbc0;
  --chassis-border: #b8b3a6;
  --chassis-highlight: #f5f3ee;

  --ink-primary: #1f1f1d;
  --ink-secondary: #54524c;
  --ink-muted: #78756d;

  --crt-bg: #141614;
  --crt-surface: #1b1e1b;
  --crt-border: #2c302c;

  --signal-orange: #ea5b0c;
  --signal-orange-dark: #c44704;
  --signal-amber: #f5b73b;
  --signal-green: #4ce05b;
  --key-ivory: #f1efe9;
  --key-charcoal: #2c2c29;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

html, body {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #dedad0;
  color: var(--ink-primary);
  font-family: "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Inter", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-touch-callout: none;
}

.braun-chassis {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: linear-gradient(180deg, #eae7df 0%, #dedad0 100%);
  padding: 10px 16px 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
  position: relative;
}

/* --------------------------------------------------------
   TOP HEADER PLATE: Brand Designation, Grille, Transport
   -------------------------------------------------------- */
.top-plate {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 7px;
  border-bottom: 2px solid var(--chassis-border);
  flex-shrink: 0;
  gap: 12px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 18px;
}

.model-title {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
  line-height: 1.05;
}

.model-title span {
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-secondary);
  margin-left: 7px;
}

.speaker-grille {
  display: grid;
  grid-template-columns: repeat(9, 5px);
  grid-template-rows: repeat(2, 5px);
  gap: 4px;
  padding: 5px 8px;
  background: var(--chassis-well);
  border-radius: 5px;
  border: 1px solid var(--chassis-border);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.18);
}

.speaker-grille span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #2f2e2a;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.85);
}

.transport-cluster {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--chassis-panel);
  border: 1px solid var(--chassis-border);
  border-radius: 4px;
  padding: 5px 9px;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.07);
}

.status-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #77746b;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.45);
  flex-shrink: 0;
}

.status-led.led-on-green {
  background: var(--signal-green);
  box-shadow: 0 0 7px rgba(76, 224, 91, 0.85);
}

.status-label {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
  white-space: nowrap;
}

.rams-help-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 4px;
  border: 1px solid #8a867b;
  background: var(--key-ivory);
  color: var(--ink-primary);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12), inset 0 1px 0 #fff;
  transition: border-color 0.1s ease, background-color 0.1s ease;
}

.rams-help-btn:hover {
  background: #fdfdfc;
  border-color: var(--ink-primary);
}

.rams-help-btn:active {
  transform: translateY(1px);
}

.help-symbol {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 800;
}

.rams-toggle-switch {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border-radius: 4px;
  border: 1px solid #8a867b;
  background: var(--key-ivory);
  color: var(--ink-primary);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15), inset 0 1px 0 #fff;
  transition: all 0.1s ease;
}

.rams-toggle-switch .switch-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #7d7a72;
}

.rams-toggle-switch.active-orange {
  background: var(--signal-orange);
  border-color: var(--signal-orange-dark);
  color: #fff;
  box-shadow: 0 2px 4px rgba(234, 91, 12, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.rams-toggle-switch.active-orange .switch-dot {
  background: #fff;
  box-shadow: 0 0 5px #fff;
}

.rams-stop-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 4px;
  border: 1px solid #1e1e1c;
  background: var(--key-charcoal);
  color: #f1efe9;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22);
}

.rams-stop-btn:hover {
  background: #383834;
}

.rams-stop-btn:active {
  transform: translateY(1px);
}

.stop-square {
  width: 7px;
  height: 7px;
  background: var(--signal-orange);
  display: inline-block;
}

/* --------------------------------------------------------
   TIER 1: FULL-WIDTH CRT DISPLAY & PROGRESSION PRESET BANK
   -------------------------------------------------------- */
.display-module {
  background: var(--chassis-well);
  padding: 6px;
  border-radius: 8px;
  border: 1px solid var(--chassis-border);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.16);
  display: flex;
  flex-direction: column;
  flex: 1 1 30%;
  min-height: 155px;
}

.crt-bezel {
  background: var(--crt-bg);
  border-radius: 6px;
  border: 1px solid var(--crt-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.crt-top-bar {
  display: grid;
  grid-template-columns: minmax(160px, 0.9fr) auto minmax(160px, 0.9fr) minmax(380px, 1.85fr);
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  background: var(--crt-surface);
  border-bottom: 1px solid #262a26;
  flex-shrink: 0;
}

.readout-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.readout-tag {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.07em;
  color: #8e948d;
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}

.dot-green {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #8ce071;
  box-shadow: 0 0 5px #8ce071;
  flex-shrink: 0;
}

.dot-amber {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #554829;
  flex-shrink: 0;
}

.dot-amber.led-blink-amber {
  background: var(--signal-amber);
  box-shadow: 0 0 7px var(--signal-amber);
  animation: pulseAmber 0.55s infinite alternate;
}

@keyframes pulseAmber {
  from { opacity: 0.35; }
  to { opacity: 1; }
}

.readout-chord {
  font-size: 21px;
  font-weight: 700;
  color: #f3f1ea;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.1;
}

.readout-chord.cued-text {
  color: var(--signal-amber);
}

.readout-sub {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9.5px;
  color: #9ba199;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.arrow-divider {
  font-size: 16px;
  color: #5e635d;
  font-weight: 700;
}

.clock-strip-box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.clock-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.clock-mono {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9.5px;
  color: #d7d5ce;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.beat-leds {
  display: flex;
  gap: 5px;
}

.beat-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #2f332f;
  border: 1px solid #444844;
}

.beat-led.active {
  background: #8ce071;
  box-shadow: 0 0 6px #8ce071;
}

.beat-led.downbeat.active {
  background: var(--signal-orange);
  box-shadow: 0 0 7px var(--signal-orange);
}

.progress-track {
  width: 100%;
  height: 4px;
  background: #272b27;
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #8ce071 0%, var(--signal-orange) 100%);
}

/* Tactile Progression Sequence Preset Bank (Zero Scroll, Full Visibility) */
.preset-seq-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  width: 100%;
  overflow: hidden;
}

.rams-seq-btn {
  background: #222622;
  color: #c9c7bf;
  border: 1px solid #363b36;
  border-radius: 4px;
  padding: 4px 7px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2px;
  min-width: 0;
  overflow: hidden;
  text-align: left;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 1px 2px rgba(0, 0, 0, 0.25);
  transition: border-color 0.1s ease, background-color 0.1s ease, transform 0.05s ease;
}

.rams-seq-btn:hover {
  background: #2a2f2a;
  border-color: #5c635c;
}

.rams-seq-btn:active {
  transform: translateY(1px);
}

.seq-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 4px;
  width: 100%;
}

.seq-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #e4e2da;
  white-space: nowrap;
}

.seq-led {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #4a4f4a;
  flex-shrink: 0;
}

.seq-title {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #8e948d;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.seq-chords {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  color: #a8aea6;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.rams-seq-btn.is-active-seq {
  background: #2b221b;
  border-color: var(--signal-orange);
  box-shadow: inset 0 0 0 1px rgba(234, 91, 12, 0.35), 0 1px 3px rgba(0, 0, 0, 0.3);
}

.rams-seq-btn.is-active-seq .seq-led {
  background: var(--signal-orange);
  box-shadow: 0 0 6px var(--signal-orange);
}

.rams-seq-btn.is-active-seq .seq-title {
  color: var(--signal-amber);
}

.rams-seq-btn.is-active-seq .seq-chords {
  color: #f3f1ea;
}

.scope-wrapper {
  width: 100%;
  flex: 1;
  min-height: 90px;
  position: relative;
}

#glide-scope {
  width: 100%;
  height: 100%;
  display: block;
}

/* --------------------------------------------------------
   TIER 2: 3-COLUMN MODULAR PARAMETER CONTROL DECK (01, 02, 03)
   -------------------------------------------------------- */
.control-deck {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1.15fr;
  gap: 10px;
  flex-shrink: 0;
}

.deck-panel {
  background: var(--chassis-panel);
  border: 1px solid var(--chassis-border);
  border-radius: 7px;
  padding: 9px 12px;
  box-shadow: inset 0 1px 0 var(--chassis-highlight);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 7px;
  min-width: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--chassis-border);
  padding-bottom: 5px;
}

.panel-num {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9px;
  font-weight: 700;
  background: var(--ink-primary);
  color: var(--chassis-bg);
  padding: 1.5px 4px;
  border-radius: 2px;
}

.panel-header h2 {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.09em;
  color: var(--ink-primary);
  white-space: nowrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.group-label {
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-secondary);
}

.segmented-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 4px;
  background: var(--chassis-well);
  padding: 2.5px;
  border-radius: 4px;
  border: 1px solid var(--chassis-border);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.08);
}

/* Unified Dieter Rams Segmented Mechanical Switches */
.rams-seg-btn {
  background: var(--key-ivory);
  border: 1px solid #b5b0a3;
  border-radius: 3px;
  padding: 5px 4px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-secondary);
  cursor: pointer;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.08), inset 0 1px 0 #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.08s ease;
}

.rams-seg-btn:hover {
  color: var(--ink-primary);
  border-color: #8f8a7d;
}

.rams-seg-btn.active {
  background: var(--ink-primary);
  color: #f5f3ee;
  border-color: #111;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.4);
}

.curve-row {
  display: grid;
  grid-template-columns: 1fr 94px;
  gap: 8px;
  align-items: stretch;
}

.curve-controls {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 6px;
  min-width: 0;
}

.curve-mini-screen {
  background: var(--crt-bg);
  border: 1px solid var(--crt-border);
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 3px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

#curve-preview {
  width: 100%;
  height: 54px;
  display: block;
}

.curve-screen-caption {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 7.5px;
  text-align: center;
  color: #8e948d;
  letter-spacing: 0.05em;
}

.dial-grid {
  display: grid;
  gap: 6px;
}

.dial-grid.two-cols {
  grid-template-columns: 1fr 1fr;
}

.dial-grid.four-cols {
  grid-template-columns: repeat(4, 1fr);
}

.dial-unit {
  background: var(--chassis-bg);
  border: 1px solid var(--chassis-border);
  border-radius: 4px;
  padding: 5px 7px;
  min-width: 0;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.dial-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-secondary);
  margin-bottom: 4px;
  white-space: nowrap;
  gap: 4px;
}

.dial-head strong {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  color: var(--ink-primary);
}

/* Precision Braun Rectangular Linear Fader */
.rams-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: #bcb6a8;
  border-radius: 2px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.28);
  outline: none;
  margin: 3px 0;
}

.rams-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 10px;
  height: 15px;
  border-radius: 2px;
  background: linear-gradient(90deg, #272724 0%, #272724 40%, #f5f3ee 40%, #f5f3ee 60%, #272724 60%, #272724 100%);
  border: 1px solid #141412;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  cursor: ew-resize;
}

.rams-slider::-moz-range-thumb {
  width: 10px;
  height: 15px;
  border-radius: 2px;
  background: linear-gradient(90deg, #272724 0%, #272724 40%, #f5f3ee 40%, #f5f3ee 60%, #272724 60%, #272724 100%);
  border: 1px solid #141412;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  cursor: ew-resize;
}

.select-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.select-field {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.select-field label {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
  white-space: nowrap;
}

.rams-select {
  -webkit-appearance: none;
  appearance: none;
  background-color: var(--key-ivory);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2354524c' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 7px center;
  border: 1px solid var(--chassis-border);
  border-radius: 3px;
  padding: 4px 20px 4px 7px;
  font-size: 9.5px;
  font-weight: 600;
  color: var(--ink-primary);
  outline: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
  box-sizing: border-box;
  cursor: pointer;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.06), inset 0 1px 0 #fff;
}

.rams-select:focus {
  border-color: var(--ink-primary);
}

/* --------------------------------------------------------
   TIER 3: MECHANICAL KEYBOARD MATRIX (04 ROOT + 05 VOICINGS)
   -------------------------------------------------------- */
.keyboard-deck {
  background: var(--chassis-panel);
  border: 1px solid var(--chassis-border);
  border-radius: 8px;
  padding: 9px 12px 11px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
  touch-action: manipulation;
  box-shadow: inset 0 1px 0 var(--chassis-highlight);
}

.root-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.chord-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.section-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-secondary);
  line-height: 1.2;
}

.hint-text {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  font-weight: 600;
  color: var(--ink-muted);
}

.root-button-row {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 5px;
}

.chord-button-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(2, 58px);
  gap: 5px;
}

.rams-btn {
  position: relative;
  border-radius: 5px;
  border: 1px solid #9e998d;
  padding: 5px 7px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  box-shadow:
    0 2px 0 #999488,
    0 2px 4px rgba(0, 0, 0, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.82);
  transition: transform 0.05s ease, box-shadow 0.05s ease, border-color 0.08s ease;
  min-width: 0;
  box-sizing: border-box;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.rams-btn:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 #999488, inset 0 1px 2px rgba(0, 0, 0, 0.18);
}

/* Root Pitch Keys: Sleek, proportional single-row switches */
.root-key {
  height: 48px;
}

.root-natural {
  background: var(--key-ivory);
  color: var(--ink-primary);
}

.root-accidental {
  background: var(--key-charcoal);
  color: #f1efe9;
  border-color: #181816;
  box-shadow:
    0 2px 0 #141412,
    0 2px 4px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.root-accidental .btn-key-hint {
  color: rgba(241, 239, 233, 0.62);
}

.root-label-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 3px;
}

.btn-enharmonic {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  font-weight: 500;
  color: rgba(241, 239, 233, 0.52);
}

/* 24 Harmonic Voicing Switches */
.chord-key {
  background: var(--key-ivory);
  color: var(--ink-primary);
  height: 100%;
}

.btn-top-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.btn-led {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #b5b0a3;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.38);
  flex-shrink: 0;
}

.root-accidental .btn-led {
  background: #4a4944;
}

.btn-key-hint {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 8.5px;
  font-weight: 600;
  color: var(--ink-muted);
}

.btn-main-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
  line-height: 1.1;
}

.btn-sub-label {
  font-size: 8px;
  color: var(--ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
  text-align: left;
}

/* Hardware-Authentic Switch States (Preserves Ivory / Charcoal Keycap Identity) */
.rams-btn.is-selected {
  border-color: var(--ink-primary);
  box-shadow:
    0 2px 0 #66635b,
    inset 0 -2px 0 var(--ink-primary),
    inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

.root-accidental.is-selected {
  border-color: #d8d5cc;
  box-shadow:
    0 2px 0 #141412,
    inset 0 -2px 0 #f1efe9,
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.rams-btn.is-active-chord {
  border-color: #2f7a37;
}

.root-natural.is-active-chord,
.chord-key.is-active-chord {
  background: #eaf2e8;
  box-shadow:
    0 2px 0 #6e8c6e,
    inset 0 -2px 0 #35843d,
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.root-accidental.is-active-chord {
  background: #252b25;
  border-color: #4ce05b;
  box-shadow:
    0 2px 0 #141412,
    inset 0 -2px 0 #4ce05b,
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.rams-btn.is-active-chord .btn-led {
  background: var(--signal-green);
  box-shadow: 0 0 7px var(--signal-green);
}

.rams-btn.is-cued-chord {
  border-color: var(--signal-orange);
  box-shadow:
    0 2px 0 #999488,
    inset 0 -2px 0 var(--signal-orange),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.root-accidental.is-cued-chord {
  border-color: var(--signal-amber);
  box-shadow:
    0 2px 0 #141412,
    inset 0 -2px 0 var(--signal-amber),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.rams-btn.is-cued-chord .btn-led {
  background: var(--signal-amber);
  box-shadow: 0 0 7px var(--signal-amber);
  animation: pulseAmber 0.5s infinite alternate;
}

/* --------------------------------------------------------
   SOLID BOTTOM BEZEL / PALM REST (Touch Safety & Hardware Frame)
   -------------------------------------------------------- */
.hardware-palm-rest {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 22px;
  padding: 0 16px max(6px, env(safe-area-inset-bottom));
  background: linear-gradient(180deg, #d3cec4 0%, #c4beb3 100%);
  border-top: 1px solid var(--chassis-border);
  flex-shrink: 0;
  margin-left: -16px;
  margin-right: -16px;
}

.chassis-rivet {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #736f66;
  border: 1px solid #948f85;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.4), 0 1px 1px rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------
   RESPONSIVE ADAPTATION (Compact Laptop Height, Tablet, Mobile)
   -------------------------------------------------------- */
@media (max-height: 820px) and (min-width: 1041px) {
  .braun-chassis {
    padding: 7px 14px 0;
    gap: 6px;
  }
  .top-plate {
    padding-bottom: 5px;
  }
  .deck-panel {
    padding: 7px 10px;
    gap: 5px;
  }
  #curve-preview {
    height: 46px;
  }
  .root-key {
    height: 42px;
  }
  .chord-button-grid {
    grid-template-rows: repeat(2, 50px);
  }
}

@media (max-width: 1120px) {
  .crt-top-bar {
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
  }
  .clock-strip-box {
    grid-column: 1 / -1;
    border-top: 1px solid #262a26;
    padding-top: 6px;
  }
}

@media (max-width: 1024px) {
  html, body {
    overflow-y: auto;
    height: auto;
  }
  .braun-chassis {
    height: auto;
    min-height: 100dvh;
  }
  .control-deck {
    grid-template-columns: 1fr 1fr;
  }
  .control-deck .deck-panel:nth-child(3) {
    grid-column: span 2;
  }
  .root-button-row {
    grid-template-columns: repeat(6, 1fr);
  }
  .chord-button-grid {
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(4, 54px);
  }
}

@media (max-width: 768px) {
  .braun-chassis {
    padding: 8px 10px 0;
  }
  .crt-top-bar {
    grid-template-columns: 1fr;
  }
  .arrow-divider {
    display: none;
  }
  .preset-seq-row {
    grid-template-columns: 1fr;
  }
  .control-deck {
    grid-template-columns: 1fr;
  }
  .control-deck .deck-panel:nth-child(3) {
    grid-column: span 1;
  }
  .root-button-row {
    grid-template-columns: repeat(4, 1fr);
  }
  .chord-button-grid {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(6, 54px);
  }
  .dial-grid.four-cols {
    grid-template-columns: 1fr 1fr;
  }
}

/* --------------------------------------------------------
   OPERATING MANUAL & SHORTCUTS POPOVER
   -------------------------------------------------------- */
.manual-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 18, 16, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 999;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.manual-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.manual-card {
  background: #f1efe9;
  color: var(--ink-primary);
  width: 100%;
  max-width: 760px;
  max-height: 86vh;
  border-radius: 10px;
  border: 1px solid #b3aea0;
  box-shadow: 0 24px 55px rgba(0, 0, 0, 0.58), inset 0 1px 0 #ffffff;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.manual-header {
  background: #dedad0;
  border-bottom: 2px solid #b8b3a6;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.manual-header h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-primary);
}

.manual-close-btn {
  background: #2b2b28;
  color: #f1efe9;
  border: none;
  border-radius: 5px;
  width: 28px;
  height: 28px;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.manual-close-btn:hover {
  background: var(--signal-orange);
}

.manual-content {
  padding: 18px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 12.5px;
  line-height: 1.5;
  color: #353430;
}

.manual-sec {
  border-bottom: 1px solid #d4d0c5;
  padding-bottom: 14px;
}

.manual-sec:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.manual-sec-title {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.11em;
  color: var(--ink-primary);
  margin-bottom: 6px;
}

.manual-highlight {
  background: #fdecd8;
  color: var(--signal-orange-dark);
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-weight: 700;
  font-size: 11px;
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid #f2c7a2;
}

.manual-table-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 6px;
}

.table-col h4 {
  font-size: 10px;
  font-weight: 700;
  color: var(--ink-secondary);
  margin-bottom: 6px;
  border-bottom: 1px solid #cbc6b9;
  padding-bottom: 3px;
}

.shortcut-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.shortcut-list li {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11.5px;
}

kbd {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 10px;
  font-weight: 700;
  background: #ffffff;
  color: #1a1a18;
  border: 1px solid #b8b3a6;
  border-bottom: 2px solid #8e8a7e;
  border-radius: 3px;
  padding: 1px 5px;
  min-width: 18px;
  text-align: center;
}

.chord-keymap-box {
  background: #e6e3da;
  border: 1px solid #cbc6b9;
  border-radius: 5px;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 5px;
}

.keymap-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.row-label {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9px;
  font-weight: 700;
  color: var(--ink-secondary);
  min-width: 82px;
}

.keymap-row code {
  font-family: "JetBrains Mono", "SF Mono", monospace;
  font-size: 9.5px;
  background: #fdfdfc;
  border: 1px solid #b8b3a6;
  border-radius: 3px;
  padding: 1px 4px;
}

.feature-bullets {
  list-style: square;
  padding-left: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.manual-footer {
  background: #dedad0;
  border-top: 1px solid #b8b3a6;
  padding: 10px 20px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}

.manual-confirm-btn {
  background: var(--signal-orange);
  color: #ffffff;
  border: 1px solid var(--signal-orange-dark);
  border-radius: 5px;
  padding: 6px 14px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
}

.manual-confirm-btn:hover {
  background: #d85006;
}