/* ── CSS Custom Properties ────────────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg:         #080808;
  --bg-rack:    #090909;
  --s0:         #0c0c0c;   /* seq canvas, deep wells */
  --s1:         #0e0e0e;   /* app-header, fx-rows */
  --s2:         #111111;   /* modules, drum machine, inputs */
  --s3:         #161616;   /* mod-headers, drum-header, btn bg */
  --s4:         #1a1a1a;   /* active/hover surfaces */

  /* Borders */
  --b0: #131313;
  --b1: #1a1a1a;
  --b2: #1e1e1e;
  --b3: #252525;
  --b4: #444444;

  /* Text — all bumped for readability */
  --t1: #cccccc;   /* primary body text */
  --t2: #999999;   /* secondary */
  --t3: #777777;   /* subdued (was #555) */
  --t4: #606060;   /* dim labels (was #3a3a3a / #444) */
  --t5: #4a4a4a;   /* ghost / section labels (was #252525) */

  /* Knob canvas */
  --kn-track: #1c1c1c;
  --kn-hi:    #525252;
  --kn-mid:   #2c2c2c;
  --kn-lo:    #0e0e0e;
  --kn-rim:   #3a3a3a;

  /* Sequencer grid canvas */
  --grid-off:        #141414;
  --grid-off-act:    #1e2a2a;
  --grid-lbl:        #686868;

  /* VU meter off-segments */
  --vu-r:  #200000;
  --vu-y:  #1a1000;
  --vu-g:  #001a08;

  /* Interactive */
  --input-bg:       #111111;
  --input-bdr:      #222222;
  --accent-cyan:    #00e5ff;
  --btn-play-hover: #001a1f;
  --btn-add-hover:  #0d0019;
  --scrollbar-bg:   #090909;
  --scrollbar-thumb:#252525;
}

:root.light-mode {
  --bg:         #dedede;
  --bg-rack:    #d2d2d2;
  --s0:         #eeeeee;
  --s1:         #c6c6c6;
  --s2:         #e4e4e4;
  --s3:         #d0d0d0;
  --s4:         #dadada;

  --b0: #c0c0c0;
  --b1: #b6b6b6;
  --b2: #aaaaaa;
  --b3: #989898;
  --b4: #686868;

  --t1: #1a1a1a;
  --t2: #3a3a3a;
  --t3: #555555;
  --t4: #686868;
  --t5: #888888;

  --kn-track: #aaaaaa;
  --kn-hi:    #888888;
  --kn-mid:   #666666;
  --kn-lo:    #444444;
  --kn-rim:   #888888;

  --grid-off:        #c8c8c8;
  --grid-off-act:    #b6ccd0;
  --grid-lbl:        #909090;

  --vu-r:  #f0d0d0;
  --vu-y:  #f0ead0;
  --vu-g:  #d0f0e0;

  --input-bg:       #e6e6e6;
  --input-bdr:      #b0b0b0;
  --accent-cyan:    #0088aa;
  --btn-play-hover: #d0f4ff;
  --btn-add-hover:  #ece0ff;
  --scrollbar-bg:   #d2d2d2;
  --scrollbar-thumb:#b0b0b0;
}

/* ── Reset / base ────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--t1);
  font-family: 'Courier New', Courier, monospace;
  font-size: 12px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── App header ──────────────────────────────────────────────────────────────── */
.app-header {
  background: var(--s1);
  border-bottom: 1px solid var(--b2);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.app-logo {
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0,229,255,0.4);
  user-select: none;
  flex-shrink: 0;
}

.transport {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.bpm-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--t3);
  font-size: 11px;
  letter-spacing: 1px;
}

.bpm-input {
  width: 52px;
  background: var(--input-bg);
  color: var(--accent-cyan);
  border: 1px solid var(--input-bdr);
  border-radius: 3px;
  padding: 3px 6px;
  font-family: inherit;
  font-size: 13px;
  text-align: center;
  outline: none;
}
.bpm-input:focus { border-color: var(--accent-cyan); }

.btn {
  background: var(--s3);
  color: var(--t2);
  border: 1px solid var(--b3);
  border-radius: 4px;
  padding: 5px 14px;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.btn:hover { background: var(--s4); color: var(--t1); border-color: var(--b4); }

.btn-play {
  color: var(--accent-cyan);
  border-color: rgba(0,229,255,0.3);
  text-shadow: 0 0 6px rgba(0,229,255,0.25);
}
.btn-play:hover  { background: var(--btn-play-hover); border-color: var(--accent-cyan); }
.btn-play.playing {
  background: #1a0000;
  color: #ff4444;
  border-color: rgba(255,68,68,0.5);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(255,68,68,0.15); }
  50%      { box-shadow: 0 0 0 5px rgba(255,68,68,0); }
}

.btn-add { color: #7c4dff; border-color: rgba(124,77,255,0.3); }
.btn-add:hover { background: var(--btn-add-hover); border-color: #7c4dff; }

.btn-theme {
  color: var(--t3);
  border-color: var(--b2);
  margin-left: auto;
  flex-shrink: 0;
}
.btn-theme:hover { color: var(--t1); }

.master-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--t4);
  font-size: 11px;
  letter-spacing: 1px;
}

/* ── Rack ─────────────────────────────────────────────────────────────────────── */
#rack {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 14px;
  padding: 14px;
  overflow-x: auto;
  overflow-y: auto;
  min-height: 120px;
  max-height: 560px;
  background: var(--bg-rack);
  border-bottom: 1px solid var(--s3);
  flex-shrink: 0;
}
#rack::-webkit-scrollbar       { width: 6px; height: 6px; }
#rack::-webkit-scrollbar-track  { background: var(--scrollbar-bg); }
#rack::-webkit-scrollbar-thumb  { background: var(--scrollbar-thumb); border-radius: 3px; }

/* ── Module ───────────────────────────────────────────────────────────────────── */
.module {
  width: 316px;
  flex-shrink: 0;
  background: var(--s2);
  border: 1px solid var(--b2);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}
.module::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent, #00e5ff);
  box-shadow: 0 0 8px var(--accent, #00e5ff);
  z-index: 1;
}

.mod-header {
  background: var(--s3);
  border-bottom: 1px solid var(--b2);
  padding: 5px 7px 5px 12px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.mod-name {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--accent, #00e5ff);
  flex-shrink: 0;
  margin-right: 2px;
}

/* Waveform buttons */
.wave-btns { display: flex; gap: 2px; }

.wave-btn {
  background: var(--s2);
  color: var(--t4);
  border: 1px solid var(--b2);
  border-radius: 2px;
  padding: 2px 5px;
  font-family: inherit;
  font-size: 9px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.1s, background 0.1s;
}
.wave-btn:hover { color: var(--t2); background: var(--s4); }
.wave-btn.active {
  background: var(--s4);
  color: var(--accent, #00e5ff);
  border-color: var(--accent, #00e5ff);
  text-shadow: 0 0 4px var(--accent, #00e5ff);
}

/* Mute button */
.mod-mute { color: var(--t4); }
.mod-mute.muted {
  background: rgba(255,68,68,0.15) !important;
  color: #ff4444 !important;
  border-color: rgba(255,68,68,0.5) !important;
  text-shadow: 0 0 4px #ff4444;
}

.mod-close {
  background: none;
  color: var(--t5);
  border: none;
  font-size: 11px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 2px;
  transition: color 0.1s;
  margin-left: auto;
}
.mod-close:hover { color: #ff4444; }

.mod-body { padding: 8px 10px 10px 14px; }

/* ── Knob rows ────────────────────────────────────────────────────────────────── */
.knob-row {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  margin-bottom: 4px;
}

.knob-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  flex: 1;
  min-width: 0;
}

.knob-val {
  font-size: 9px;
  color: var(--t4);
  text-align: center;
  min-height: 11px;
  letter-spacing: 0.3px;
}

.knob-lbl {
  font-size: 9px;
  color: var(--t4);
  text-align: center;
  letter-spacing: 1px;
}

.vu-meter { align-self: flex-end; border-radius: 2px; margin-left: 2px; }

/* ── Section labels ───────────────────────────────────────────────────────────── */
.section-lbl {
  font-size: 9px;
  color: var(--t5);
  letter-spacing: 2px;
  text-align: center;
  margin: 5px 0 3px;
}

.fx-toggle {
  cursor: pointer;
  color: var(--t4);
  transition: color 0.15s;
}
.fx-toggle:hover { color: var(--t3); }

/* ── Sequencer canvas ─────────────────────────────────────────────────────────── */
.seq-canvas { display: block; border-radius: 2px; background: var(--s0); }

/* ── Effects panel ────────────────────────────────────────────────────────────── */
.fx-panel { display: none; margin-top: 4px; }
.fx-panel.open { display: block; }

.fx-adder {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-bottom: 6px;
}

.fx-add-btn {
  background: var(--s0);
  color: var(--t4);
  border: 1px solid var(--b2);
  border-radius: 2px;
  padding: 2px 7px;
  font-family: inherit;
  font-size: 9px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.1s, border-color 0.1s, background 0.1s;
}
.fx-add-btn:hover {
  color: var(--accent-cyan);
  border-color: rgba(0,229,255,0.4);
  background: var(--btn-play-hover);
}

.fx-rows { display: flex; flex-direction: column; gap: 4px; }

.fx-row {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  background: var(--s1);
  border: 1px solid var(--b1);
  border-radius: 3px;
  padding: 4px 6px;
}

.fx-name {
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--t3);
  width: 38px;
  flex-shrink: 0;
  align-self: center;
}

.fx-knobs { display: flex; gap: 2px; flex: 1; }
.fx-knobs .knob-wrap { flex: 1; }

.fx-remove {
  background: none;
  color: var(--t5);
  border: none;
  font-size: 14px;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
  align-self: center;
  transition: color 0.1s;
}
.fx-remove:hover { color: #ff4444; }

/* ── Drum machine ─────────────────────────────────────────────────────────────── */
#drum-section {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  background: var(--bg-rack);
  padding: 12px 16px;
}
#drum-section::-webkit-scrollbar       { width: 6px; height: 6px; }
#drum-section::-webkit-scrollbar-track  { background: var(--scrollbar-bg); }
#drum-section::-webkit-scrollbar-thumb  { background: var(--scrollbar-thumb); border-radius: 3px; }

.drum-machine {
  background: var(--s2);
  border: 1px solid var(--b2);
  border-radius: 6px;
  overflow: hidden;
  max-width: 1200px;
  min-width: 600px;
}

.drum-header {
  background: var(--s3);
  border-bottom: 1px solid var(--b2);
  padding: 7px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.drum-title-text {
  font-size: 11px;
  letter-spacing: 3px;
  color: #ff6b35;
  text-shadow: 0 0 8px rgba(255,107,53,0.4);
  flex-shrink: 0;
}

/* Kit selector */
.kit-btns { display: flex; gap: 3px; }

.kit-btn {
  background: var(--s2);
  color: var(--t4);
  border: 1px solid var(--b2);
  border-radius: 2px;
  padding: 2px 7px;
  font-family: inherit;
  font-size: 9px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.1s, border-color 0.1s, background 0.1s;
}
.kit-btn:hover { color: var(--t2); background: var(--s4); }
.kit-btn.active {
  background: var(--s4);
  color: #ff6b35;
  border-color: rgba(255,107,53,0.6);
  text-shadow: 0 0 4px rgba(255,107,53,0.4);
}

.drum-master-meter { flex: 1; max-width: 120px; border-radius: 2px; }

/* Ruler */
.drum-ruler {
  display: flex;
  align-items: center;
  padding: 3px 10px;
  border-bottom: 1px solid var(--b0);
}
.drum-row-spacer { width: 326px; flex-shrink: 0; }
.drum-ruler-num {
  flex: 1;
  text-align: center;
  font-size: 9px;
  color: var(--t5);
  height: 12px;
  line-height: 12px;
}
.drum-ruler-num.group-start { margin-left: 4px; }
.drum-ruler-num:first-child  { margin-left: 0; }

/* Channel rows */
.drum-row {
  display: flex;
  align-items: center;
  padding: 5px 10px;
  border-bottom: 1px solid var(--b0);
  gap: 8px;
}
.drum-row:last-child { border-bottom: none; }

.drum-ch-label {
  width: 46px;
  font-size: 10px;
  letter-spacing: 1px;
  flex-shrink: 0;
  text-shadow: 0 0 5px currentColor;
}

.drum-vol-knob { width: 28px; flex-shrink: 0; }
.drum-vol-knob .knob-lbl,
.drum-vol-knob .knob-val { display: none; }

/* Drum type select */
.drum-type-select {
  width: 56px;
  flex-shrink: 0;
  background: var(--input-bg);
  color: var(--t3);
  border: 1px solid var(--input-bdr);
  border-radius: 2px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 8px;
  letter-spacing: 0.5px;
  padding: 2px 3px;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.drum-type-select:focus { border-color: var(--b4); }

/* Drum tune / tone / nudge / dist / sat knobs */
.drum-tune-knob,
.drum-tone-knob,
.drum-nudge-knob,
.drum-dist-knob,
.drum-sat-knob { width: 28px; flex-shrink: 0; }

/* Octave selector */
.oct-btns {
  display: flex;
  gap: 2px;
  flex: 1;
  justify-content: flex-start;
}

.oct-btn {
  background: var(--s2);
  color: var(--t4);
  border: 1px solid var(--b2);
  border-radius: 2px;
  padding: 2px 0;
  width: 26px;
  font-family: inherit;
  font-size: 9px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.1s, background 0.1s;
}
.oct-btn:hover { color: var(--t2); background: var(--s4); }
.oct-btn.active {
  background: var(--s4);
  color: var(--accent, #00e5ff);
  border-color: var(--accent, #00e5ff);
  text-shadow: 0 0 4px var(--accent, #00e5ff);
}

.drum-steps { display: flex; gap: 2px; flex: 1; }

/* Step button */
.drum-step {
  flex: 1;
  height: 22px;
  background: var(--b0);
  border: 1px solid var(--b1);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.05s, box-shadow 0.05s;
  padding: 0;
}
.drum-step.group-start { margin-left: 4px; }
.drum-step:first-child  { margin-left: 0; }
.drum-step:hover { background: var(--s4); }
.drum-step.active {
  background: var(--col, #ff6b35);
  border-color: var(--col, #ff6b35);
  box-shadow: 0 0 5px var(--col, #ff6b35);
}
.drum-step.playing {
  outline: 1px solid rgba(255,255,255,0.2);
  outline-offset: -1px;
}
.drum-step.active.playing {
  background: #ffffff;
  border-color: #ffffff;
  box-shadow: 0 0 10px #fff, 0 0 20px var(--col, #ff6b35);
}

/* ── Light mode adjustments ───────────────────────────────────────────────────── */
:root.light-mode .app-logo { text-shadow: none; }
:root.light-mode .btn-play { text-shadow: none; }
:root.light-mode .drum-title-text { text-shadow: none; }
:root.light-mode .module::before { box-shadow: none; }

/* Accent-colored text needs darkening on light backgrounds */
:root.light-mode .mod-name,
:root.light-mode .wave-btn.active,
:root.light-mode .oct-btn.active {
  color: color-mix(in srgb, var(--accent, #00e5ff), #000000 55%);
  text-shadow: none;
}

:root.light-mode .kit-btn.active {
  color: color-mix(in srgb, #ff6b35, #000000 45%);
  text-shadow: none;
}

:root.light-mode .drum-step.playing {
  outline-color: rgba(0,0,0,0.25);
}
:root.light-mode .drum-step.active.playing {
  background: var(--col, #ff6b35);
  border-color: #ffffff;
  box-shadow: 0 0 6px rgba(0,0,0,0.3), 0 0 12px var(--col, #ff6b35);
}

:root.light-mode .drum-ch-label { text-shadow: none; }

/* ── Touch / Mobile ──────────────────────────────────────────────────────────── */

/* Remove 300ms tap delay on interactive elements */
button, .drum-step { touch-action: manipulation; }

/* Momentum scrolling on iOS */
#rack, #drum-section { -webkit-overflow-scrolling: touch; }

/* Prevent text selection / callout on long-press */
button, canvas { -webkit-user-select: none; user-select: none; }

/* Kit buttons may wrap on narrow screens */
.kit-btns { flex-wrap: wrap; }

/* Touch-friendly targets on coarse-pointer (touch) devices */
@media (hover: none) and (pointer: coarse) {
  .drum-step { height: 30px; }

  .wave-btn,
  .kit-btn,
  .oct-btn,
  .fx-add-btn { padding: 5px 8px; min-height: 30px; }

  .drum-type-select { height: 30px; }

  /* BPM and play button bigger for fat fingers */
  .bpm-input  { font-size: 15px; padding: 5px 8px; width: 60px; }
  .btn        { padding: 8px 16px; }
}

/* ── Responsive header ────────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .btn-theme { margin-left: 0; }
  .master-wrap { margin-left: 0; }
}