/* ═══════════════════════════════════════════════════════
   SLINGA — Live Beat Looper  |  css/style.css
   Dark neon aesthetic inspired by electronic music gear
═══════════════════════════════════════════════════════ */

/* ── Tokens ──────────────────────────────────────── */
:root {
  --bg:          #0a0a14;
  --bg2:         #111122;
  --bg3:         #1a1a30;
  --border:      #2a2a45;
  --text:        #c8c8e8;
  --text-dim:    #5a5a88;
  --text-bright: #e8e8ff;

  /* Pad zone colors */
  --c-drum:      #ff3300;
  --c-drum-bg:   #2d0800;
  --c-perc:      #ff6600;
  --c-perc-bg:   #2d1200;
  --c-note:      #00e5ff;
  --c-note-bg:   #002030;
  --c-root:      #ffffff;
  --c-chord:     #aa44ff;
  --c-chord-bg:  #180828;
  --c-loop:      #ffdd00;
  --c-loop-bg:   #201a00;
  --c-loop-rec:  #ff0066;
  --c-loop-play: #00ff88;
  --c-transport: #44aaff;
  --c-transport-bg: #001428;
  --c-side:      #ff88cc;
  --c-side-bg:   #200018;

  --glow-drum:   0 0 12px #ff330088, 0 0 28px #ff330044;
  --glow-note:   0 0 12px #00e5ff88, 0 0 28px #00e5ff44;
  --glow-root:   0 0 14px #ffffffaa, 0 0 32px #ffffff66;
  --glow-chord:  0 0 12px #aa44ff88, 0 0 28px #aa44ff44;
  --glow-loop:   0 0 12px #ffdd0088, 0 0 28px #ffdd0044;
  --glow-rec:    0 0 14px #ff006699, 0 0 32px #ff006655;
  --glow-play:   0 0 12px #00ff8888, 0 0 28px #00ff8844;
  --glow-side:   0 0 12px #ff88cc88, 0 0 28px #ff88cc44;

  --rad-pad:     6px;
  --pad-size:    52px;
  --pad-gap:     5px;
  --font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', 'Courier New', monospace;
}

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

html { font-size: 14px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ── Header ──────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  gap: 12px;
  flex-shrink: 0;
  z-index: 10;
}

.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-name {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: #fff;
  text-shadow: 0 0 18px #00e5ff99, 0 0 40px #00e5ff44;
}
.brand-tagline { font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.2em; text-transform: uppercase; }

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

.bpm-group { display: flex; align-items: center; gap: 6px; }
.bpm-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 14px;
  cursor: pointer;
  transition: border-color 0.15s;
  min-width: 70px;
}
.bpm-display:hover { border-color: var(--c-transport); }
#bpm-value { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; color: var(--c-transport); line-height: 1; }
.bpm-label { font-size: 0.6rem; color: var(--text-dim); letter-spacing: 0.2em; }

.btn-icon {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  width: 28px; height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.12s, color 0.12s;
}
.btn-icon:hover { background: var(--border); color: #fff; }

.btn-tap {
  background: var(--bg3);
  border: 1px solid var(--c-transport);
  color: var(--c-transport);
  padding: 5px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.12s, box-shadow 0.12s;
}
.btn-tap:hover, .btn-tap:active { background: #071428; box-shadow: 0 0 10px #44aaff66; }
.btn-tap.flash { background: var(--c-transport); color: #000; }

.btn-metronome {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 34px; height: 34px;
  border-radius: 6px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.12s;
}
.btn-metronome:hover { border-color: var(--text); color: var(--text); }
.btn-metronome.active { border-color: var(--c-transport); color: var(--c-transport); box-shadow: 0 0 8px #44aaff55; }
.btn-metronome.beat { background: var(--c-transport); color: #000; }

.header-right { display: flex; align-items: center; gap: 10px; }

.midi-status { display: flex; align-items: center; gap: 6px; font-size: 0.75rem; color: var(--text-dim); }
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.3s, box-shadow 0.3s;
}
.status-dot.connected { background: var(--c-loop-play); box-shadow: 0 0 6px var(--c-loop-play); }
.status-dot.partial { background: var(--c-loop); box-shadow: 0 0 6px var(--c-loop); }
.status-dot.error { background: var(--c-loop-rec); box-shadow: 0 0 6px var(--c-loop-rec); }

.btn-connect {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.12s;
}
.btn-connect:hover { border-color: var(--c-transport); color: var(--c-transport); }

/* ── Main layout ─────────────────────────────────── */
.app-main {
  display: flex;
  flex: 1;
  gap: 16px;
  padding: 16px 18px;
  min-height: 0;
  overflow: auto;
  align-items: flex-start;
}

/* ── Launchpad section ───────────────────────────── */
.lp-section {
  min-width: 0;
  flex: 1;
  width: 100%;
  max-width: calc(9 * var(--pad-size) + 10 * var(--pad-gap) + 26px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.lp-wrapper {
  width: 100%;
  max-width: calc(9 * var(--pad-size) + 10 * var(--pad-gap) + 26px);
  background: #0d0d1e;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: clamp(6px, 1.2vw, 12px);
  box-shadow: 0 0 40px #00000080, inset 0 1px 0 #ffffff0a;
}

/* Top row (LP round buttons 91-98) */
.lp-top-row {
  display: flex;
  gap: var(--pad-gap);
  margin-bottom: var(--pad-gap);
  padding-left: calc(var(--pad-size) + var(--pad-gap)); /* align with main grid */
}

/* Main 8×9 grid */
.lp-grid {
  display: flex;
  flex-direction: column;
  gap: var(--pad-gap);
}

.lp-row {
  display: flex;
  gap: var(--pad-gap);
}

/* ── Pads ─────────────────────────────────────────── */
.lp-pad {
  width: var(--pad-size);
  height: var(--pad-size);
  border-radius: var(--rad-pad);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  font-family: var(--font-mono);
  font-size: clamp(0.44rem, 1.05vw, 0.52rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #ffffff55;
  border: 1px solid #ffffff0a;
  background: #111120;
  position: relative;
  transition: transform 0.06s, box-shadow 0.08s, background 0.08s, color 0.08s;
  -webkit-tap-highlight-color: transparent;
}

.lp-pad:active, .lp-pad.pressed {
  transform: scale(0.91);
}

/* Pad zone types */
.lp-pad[data-zone="drum"] {
  background: var(--c-drum-bg);
  border-color: #3a1200;
  color: #ff880055;
}
.lp-pad[data-zone="drum"].lit {
  background: var(--c-drum);
  color: #fff;
  box-shadow: var(--glow-drum);
  border-color: var(--c-drum);
}

.lp-pad[data-zone="perc"] {
  background: var(--c-perc-bg);
  border-color: #2a1400;
  color: #ff990055;
}
.lp-pad[data-zone="perc"].lit {
  background: var(--c-perc);
  color: #fff;
  box-shadow: 0 0 12px #ff660088, 0 0 28px #ff660044;
  border-color: var(--c-perc);
}

.lp-pad[data-zone="note"] {
  background: var(--c-note-bg);
  border-color: #002438;
  color: #00e5ff33;
}
.lp-pad[data-zone="note"].lit {
  background: var(--c-note);
  color: #000;
  box-shadow: var(--glow-note);
  border-color: var(--c-note);
}

.lp-pad[data-zone="root"] {
  background: #1a1a28;
  border-color: #404050;
  color: #ffffff66;
}
.lp-pad[data-zone="root"].lit {
  background: var(--c-root);
  color: #000;
  box-shadow: var(--glow-root);
  border-color: #fff;
}

.lp-pad[data-zone="chord"] {
  background: var(--c-chord-bg);
  border-color: #200830;
  color: #aa44ff44;
}
.lp-pad[data-zone="chord"].lit {
  background: var(--c-chord);
  color: #fff;
  box-shadow: var(--glow-chord);
  border-color: var(--c-chord);
}

.lp-pad[data-zone="loop"] {
  background: var(--c-loop-bg);
  border-color: #1a1400;
  color: #ffdd0033;
}
.lp-pad[data-zone="loop"].lit-empty {
  background: #1e1a00;
  border-color: #3a3000;
  color: #ffdd0066;
}
.lp-pad[data-zone="loop"].lit-rec {
  background: var(--c-loop-rec);
  color: #fff;
  box-shadow: var(--glow-rec);
  border-color: var(--c-loop-rec);
  animation: pulse-rec 0.5s ease-in-out infinite alternate;
}
.lp-pad[data-zone="loop"].lit-play {
  background: var(--c-loop-play);
  color: #000;
  box-shadow: var(--glow-play);
  border-color: var(--c-loop-play);
}
.lp-pad[data-zone="loop"].lit-paused {
  background: var(--c-loop);
  color: #000;
  box-shadow: var(--glow-loop);
  border-color: var(--c-loop);
}

@keyframes pulse-rec {
  from { opacity: 0.8; }
  to { opacity: 1; box-shadow: var(--glow-rec), 0 0 40px #ff006666; }
}

.lp-pad[data-zone="transport"] {
  background: var(--c-transport-bg);
  border-color: #001828;
  color: #44aaff44;
}
.lp-pad[data-zone="transport"].lit {
  background: var(--c-transport);
  color: #000;
  box-shadow: 0 0 12px #44aaff88, 0 0 28px #44aaff44;
  border-color: var(--c-transport);
}
.lp-pad[data-zone="transport"].active {
  border-color: var(--c-transport);
  color: var(--c-transport);
}

.lp-pad[data-zone="side"] {
  background: var(--c-side-bg);
  border-color: #22001a;
  color: #ff88cc33;
  width: var(--pad-size);
  border-radius: var(--pad-size);  /* pill shape for side buttons */
}
.lp-pad[data-zone="side"].lit {
  background: var(--c-side);
  color: #000;
  box-shadow: var(--glow-side);
  border-color: var(--c-side);
}
.lp-pad[data-zone="side"].active-inst {
  border-color: var(--c-side);
  color: var(--c-side);
  background: #300028;
  box-shadow: var(--glow-side);
}

/* Top buttons (round) */
.lp-pad[data-zone="top"] {
  background: #141420;
  border-color: #202038;
  border-radius: var(--pad-size);
  color: #44aaff44;
}
.lp-pad[data-zone="top"].lit {
  background: var(--c-transport);
  color: #000;
}
.lp-pad[data-zone="top"].active {
  border-color: var(--c-transport);
  color: var(--c-transport);
}

/* Pad label line 2 (small) */
.pad-sub { font-size: 0.45rem; color: inherit; opacity: 0.7; }

/* ── Legend ──────────────────────────────────────── */
.grid-legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.68rem;
  color: var(--text-dim);
}
.legend-item { display: flex; align-items: center; gap: 4px; }
.legend-dot { width: 8px; height: 8px; border-radius: 2px; flex-shrink: 0; }

/* ── Controls panel ──────────────────────────────── */
.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 240px;
  max-width: 300px;
  width: min(300px, 100%);
}

.options-menu summary {
  list-style: none;
  cursor: pointer;
}
.options-menu summary::-webkit-details-marker {
  display: none;
}
.options-summary::after {
  content: '▾';
  float: right;
  color: var(--text-dim);
  transition: transform 0.12s;
}
.options-menu:not([open]) .options-summary::after {
  transform: rotate(-90deg);
}
.option-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--text-dim);
}
.option-meta {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.control-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-title {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.key-row {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}
.key-display {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 0;
  min-width: 70px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.btn-arrow {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  width: 30px; height: 30px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.1s;
}
.btn-arrow:hover { border-color: var(--text); color: #fff; }

.select-scale {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.12s;
}
.select-scale:hover, .select-scale:focus { border-color: var(--c-note); }

.scale-hint {
  font-size: 0.65rem;
  color: var(--text-dim);
  line-height: 1.4;
  font-style: italic;
}

/* Instrument grid */
.instrument-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}
.btn-inst {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 4px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all 0.12s;
}
.btn-inst:hover { border-color: var(--c-side); color: var(--c-side); }
.btn-inst.active { border-color: var(--c-side); color: var(--c-side); background: var(--c-side-bg); box-shadow: 0 0 8px #ff88cc44; }

.drum-pad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.drum-pad-btn {
  background: #1a0d08;
  border: 1px solid #3a1200;
  color: #ffb088;
  border-radius: 8px;
  padding: 12px 4px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.06s, background 0.1s, box-shadow 0.12s, border-color 0.12s;
}

.drum-pad-btn:hover {
  border-color: var(--c-drum);
}

.drum-pad-btn.hit {
  background: var(--c-drum);
  color: #fff;
  border-color: var(--c-drum);
  box-shadow: var(--glow-drum);
  transform: scale(0.96);
}

/* FX sliders */
.fx-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--text-dim);
}
.fx-label input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  background: var(--bg3);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}
.fx-label input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c-transport);
  cursor: pointer;
  box-shadow: 0 0 6px var(--c-transport);
}
.fx-label span { font-family: var(--font-mono); font-size: 0.65rem; width: 30px; text-align: right; color: var(--text); }

.btn-panic {
  background: #1a0008;
  border: 1px solid #550020;
  color: #ff4488;
  padding: 10px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.12s;
  margin-top: auto;
}
.btn-panic:hover { background: #ff0066; color: #fff; box-shadow: 0 0 14px #ff006699; }

/* ── Loop section ────────────────────────────────── */
.loop-section {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 12px 18px;
  flex-shrink: 0;
}

.loop-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
}
.loop-header h3 {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
}
.loop-hint { font-size: 0.65rem; color: var(--text-dim); }

.loop-tracks {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.loop-track {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  min-width: 130px;
  flex: 1;
  max-width: 240px;
  cursor: pointer;
  transition: border-color 0.15s;
}
.loop-track:hover { border-color: var(--c-loop); }
.loop-track.recording { border-color: var(--c-loop-rec); box-shadow: 0 0 8px #ff006644; }
.loop-track.playing { border-color: var(--c-loop-play); box-shadow: 0 0 8px #00ff8844; }
.loop-track.paused { border-color: var(--c-loop); }

.loop-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dim);
  width: 14px;
  flex-shrink: 0;
}

.loop-progress {
  flex: 1;
  height: 6px;
  background: #1a1a2a;
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}
.loop-bar {
  height: 100%;
  border-radius: 3px;
  width: 0%;
  background: var(--c-loop-play);
  transition: width 0.05s linear;
}
.loop-track.recording .loop-bar { background: var(--c-loop-rec); animation: rec-pulse-bar 0.5s ease-in-out infinite alternate; }
.loop-track.paused .loop-bar { background: var(--c-loop); }

@keyframes rec-pulse-bar {
  from { opacity: 0.6; }
  to { opacity: 1; }
}

.loop-state {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-transform: uppercase;
  width: 38px;
  text-align: right;
  flex-shrink: 0;
}
.loop-track.recording .loop-state { color: var(--c-loop-rec); }
.loop-track.playing .loop-state { color: var(--c-loop-play); }
.loop-track.paused .loop-state { color: var(--c-loop); }

/* ── Help bar ─────────────────────────────────────── */
.help-bar {
  display: flex;
  gap: 0;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.help-col {
  flex: 1;
  min-width: 140px;
  padding: 7px 14px;
  font-size: 0.68rem;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
}
.help-col:last-child { border-right: none; }
.help-col strong { color: var(--text); }

/* ── Start overlay ───────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: #0a0a14f0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}
.overlay.hidden { display: none; }

.overlay-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 44px;
  max-width: 520px;
  width: 90%;
  text-align: center;
  box-shadow: 0 0 80px #000000cc;
}

.overlay-title {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: #fff;
  text-shadow: 0 0 30px #00e5ffaa, 0 0 70px #00e5ff44;
  margin-bottom: 8px;
}
.overlay-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 28px;
}

.overlay-tips {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
  text-align: left;
}
.tip {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.78rem;
  color: var(--text);
  line-height: 1.4;
}

.btn-start {
  background: linear-gradient(135deg, #00e5ff22, #aa44ff22);
  border: 1px solid var(--c-note);
  color: var(--c-note);
  padding: 14px 32px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 0 20px #00e5ff33;
}
.btn-start:hover {
  background: linear-gradient(135deg, #00e5ff44, #aa44ff44);
  box-shadow: 0 0 30px #00e5ff66;
  transform: scale(1.03);
}

/* ── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a3a60; }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 1180px) {
  .app-main { flex-direction: column; align-items: center; }
  .controls-panel { max-width: 100%; width: 100%; flex-direction: row; flex-wrap: wrap; }
  .control-card { flex: 1; min-width: 220px; }
}

@media (max-width: 600px) {
  .brand-name { font-size: 1.4rem; }
  .app-header { flex-wrap: wrap; }
  .help-bar { display: none; }
}