/* ============================================================
   JC-808 Rhythm Composer
   Visual language: hard-anodised chassis, cream silkscreen,
   step buttons coloured in bars of four.
   ============================================================ */

:root {
  --chassis:      #17171a;
  --panel:        #232327;
  --panel-hi:     #2c2c31;
  --panel-lo:     #131316;
  --edge:         #3a3a41;
  --edge-soft:    #2a2a30;

  --cream:        #ece5d5;
  --cream-dim:    #9d968a;
  --muted:        #6f6a63;

  --red:          #d8382c;
  --orange:       #e8792a;
  --yellow:       #e8bf2c;
  --bone:         #d9d2c2;
  --accent:       #ff5b1f;
  --green:        #3fbf6f;

  --radius:       4px;
  --radius-lg:    10px;
  --gap:          14px;

  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 0 64px;
  background:
    radial-gradient(1200px 600px at 50% -10%, #26262c 0%, transparent 60%),
    var(--chassis);
  color: var(--cream);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

button, input, select { font-family: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.app {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 18px;
}

/* ---------- header ---------- */

.masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 26px 0 18px;
  border-bottom: 1px solid var(--edge-soft);
  margin-bottom: 20px;
}

.brand { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }

.brand h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.brand .model {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--accent);
  text-transform: uppercase;
}

.brand .sub {
  display: block;
  width: 100%;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.masthead nav { display: flex; gap: 18px; font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; }
.masthead nav a { color: var(--cream-dim); text-decoration: none; border-bottom: 1px solid transparent; padding-bottom: 2px; }
.masthead nav a:hover { color: var(--cream); border-bottom-color: var(--accent); }

/* ---------- panels ---------- */

.panel {
  background: linear-gradient(180deg, var(--panel-hi), var(--panel));
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 12px 28px rgba(0,0,0,0.35);
  margin-bottom: var(--gap);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-bottom: 1px solid var(--edge-soft);
}

.panel-title {
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cream-dim);
  margin: 0;
  font-weight: 600;
}

.panel-body { padding: 16px; }

/* ---------- transport ---------- */

.transport {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
  padding: 16px;
}

.transport-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-right: 22px;
  border-right: 1px solid var(--edge-soft);
}
.transport-group:last-child { border-right: 0; padding-right: 0; }

.play-btn {
  width: 62px; height: 62px;
  border-radius: 50%;
  border: 1px solid var(--edge);
  background: linear-gradient(180deg, #34343a, #202024);
  box-shadow: 0 2px 0 rgba(255,255,255,0.05) inset, 0 6px 14px rgba(0,0,0,0.45);
  display: grid; place-items: center;
  transition: transform 0.08s ease, box-shadow 0.15s ease;
}
.play-btn:active { transform: translateY(2px); box-shadow: 0 4px 8px rgba(0,0,0,0.4); }
.play-btn svg { width: 22px; height: 22px; fill: var(--cream); }
.play-btn.playing { background: linear-gradient(180deg, #2f6f47, #1d4a2e); border-color: #47a06b; }
.play-btn.playing svg { fill: #d6ffe6; }

.readout {
  font-family: var(--mono);
  background: var(--panel-lo);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  padding: 8px 12px;
  min-width: 108px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.35) inset;
}
.readout .value { display: block; font-size: 22px; font-weight: 600; color: var(--accent); letter-spacing: 0.04em; }
.readout .label { display: block; font-size: 9px; letter-spacing: 0.22em; color: var(--muted); text-transform: uppercase; }

.btn {
  background: linear-gradient(180deg, #33333a, #232329);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  color: var(--cream-dim);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 9px 13px;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.btn:hover { color: var(--cream); border-color: #4c4c55; }
.btn:active { transform: translateY(1px); }
.btn.on { color: #fff; background: linear-gradient(180deg, #ff6b2c, #d94a15); border-color: #ff8a52; }
.btn.ghost { background: transparent; }
.btn.danger:hover { color: #ff8a7a; border-color: #7a3730; }

.select {
  background: var(--panel-lo);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.field { display: flex; flex-direction: column; gap: 5px; }
.field > span {
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* bank selector */
.banks { display: flex; gap: 6px; }
.bank {
  width: 38px; height: 38px;
  border-radius: var(--radius);
  border: 1px solid var(--edge);
  background: linear-gradient(180deg, #303036, #202025);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--cream-dim);
}
.bank.active { background: linear-gradient(180deg, #ff6b2c, #d94a15); color: #fff; border-color: #ff8a52; }
.bank.queued { border-color: var(--accent); color: var(--accent); }

/* ---------- machine / step grid ---------- */

.machine-scroll { overflow-x: auto; padding: 4px 16px 16px; }

.machine { min-width: 860px; }

.ruler {
  display: grid;
  grid-template-columns: var(--label-col, 208px) repeat(16, 1fr);
  gap: 6px;
  padding-bottom: 6px;
  align-items: end;
}
.ruler span:first-child { font-size: 9px; letter-spacing: 0.2em; color: var(--muted); text-transform: uppercase; }
.ruler b {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--muted);
  text-align: center;
}
.ruler b.beat { color: var(--cream-dim); }

.track {
  display: grid;
  grid-template-columns: var(--label-col, 208px) repeat(16, 1fr);
  gap: 6px;
  align-items: center;
  padding: 3px 0;
}
.track.selected .track-name { color: var(--cream); }
.track.dimmed .step { opacity: 0.32; }

.track-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-right: 10px;
}

.track-trigger {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 0;
  padding: 4px 0;
  text-align: left;
}
.track-trigger:active .swatch { transform: scale(0.85); }

.swatch {
  width: 9px; height: 9px;
  border-radius: 2px;
  background: var(--tcolor, var(--cream-dim));
  flex: none;
  transition: transform 0.08s ease, box-shadow 0.2s ease;
}
.track-trigger.lit .swatch { box-shadow: 0 0 10px 2px var(--tcolor); }

.track-abbr {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cream);
  width: 24px;
  flex: none;
}
.track-name {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--cream-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mini {
  width: 20px; height: 20px;
  flex: none;
  border-radius: 3px;
  border: 1px solid var(--edge);
  background: var(--panel-lo);
  font-size: 9px;
  font-weight: 700;
  color: var(--muted);
  line-height: 1;
  display: grid;
  place-items: center;
}
.mini.on[data-role="mute"] { background: #6d2a24; border-color: #a5473c; color: #ffd9d3; }
.mini.on[data-role="solo"] { background: #6b5a18; border-color: #b39628; color: #fff0bd; }

/* step buttons */
.step {
  position: relative;
  height: 40px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.55);
  background: linear-gradient(180deg, #3a3a41, #26262b);
  box-shadow: 0 1px 0 rgba(255,255,255,0.07) inset, 0 2px 4px rgba(0,0,0,0.4);
  padding: 0;
  transition: transform 0.06s ease, filter 0.1s ease;
}
.step:hover { filter: brightness(1.35); }
.step:active { transform: translateY(1px); }

.step[data-group="0"].on { background: linear-gradient(180deg, #ef5347, var(--red)); }
.step[data-group="1"].on { background: linear-gradient(180deg, #f9903c, var(--orange)); }
.step[data-group="2"].on { background: linear-gradient(180deg, #f6d244, var(--yellow)); }
.step[data-group="3"].on { background: linear-gradient(180deg, #ece5d5, var(--bone)); }
.step.on { border-color: rgba(0,0,0,0.7); box-shadow: 0 0 12px -2px currentColor, 0 1px 0 rgba(255,255,255,0.35) inset; }

.step.beat::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 2px;
  background: rgba(255,255,255,0.14);
  border-radius: 0 0 3px 3px;
}

.step.playhead { outline: 2px solid var(--cream); outline-offset: 1px; }
.step.past-length { opacity: 0.22; }

.track.accent .step { height: 24px; }
.track.accent .step.on { background: linear-gradient(180deg, #fff2d2, #ffb545); }

/* voice knob drawer */
.voice-strip {
  grid-column: 1 / -1;
  display: none;
  gap: 26px;
  align-items: center;
  padding: 12px 14px;
  margin: 4px 0 8px;
  background: var(--panel-lo);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
}
.track.expanded .voice-strip { display: flex; flex-wrap: wrap; }

/* ---------- knobs ---------- */

.knob-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 60px;
  flex: none;
}
.knob {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: ns-resize;
  touch-action: none;
  position: relative;
}
.knob svg { width: 100%; height: 100%; display: block; }
.knob .dial { fill: url(#knobGrad); stroke: #45454d; stroke-width: 1; }
.knob .arc-bg { stroke: #16161a; stroke-width: 3.5; fill: none; stroke-linecap: round; }
.knob .arc { stroke: var(--accent); stroke-width: 3.5; fill: none; stroke-linecap: round; }
.knob .pointer { stroke: var(--cream); stroke-width: 2.4; stroke-linecap: round; }
.knob-label {
  font-size: 8px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
}
.knob-value { font-family: var(--mono); font-size: 10px; color: var(--cream-dim); }

/* ---------- synth ---------- */

.synth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  padding: 16px;
}
.module {
  background: var(--panel-lo);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.module h3 {
  margin: 0 0 12px;
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.module-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }

.seg { display: flex; border: 1px solid var(--edge); border-radius: var(--radius); overflow: hidden; }
.seg button {
  background: #202025;
  border: 0;
  border-right: 1px solid var(--edge);
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 7px 9px;
}
.seg button:last-child { border-right: 0; }
.seg button.on { background: linear-gradient(180deg, #ff6b2c, #d94a15); color: #fff; }

/* keyboard */
.keyboard-wrap { padding: 0 16px 18px; overflow-x: auto; }
.keyboard {
  position: relative;
  display: flex;
  height: 150px;
  min-width: 640px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  background: #101013;
  border: 1px solid var(--edge-soft);
  border-radius: 0 0 8px 8px;
  padding: 6px 6px 0;
}

.wkey, .bkey {
  position: relative;
  border: 0;
  padding: 0;
  border-radius: 0 0 5px 5px;
  cursor: pointer;
  touch-action: none;
}

.wkey {
  flex: 1;
  background: linear-gradient(180deg, #f4efe4 0%, #ded7c7 88%, #c3bcac 100%);
  box-shadow: 0 3px 0 #8e8879, inset -1px 0 0 rgba(0,0,0,0.22);
  margin-right: 2px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 9px;
}
.wkey.down { background: linear-gradient(180deg, #ffb98c 0%, #ff8a4c 100%); box-shadow: 0 1px 0 #8e8879; transform: translateY(2px); }
.wkey.flash { background: linear-gradient(180deg, #fff0dd 0%, #ffcda4 100%); }
.wkey.down.flash { background: linear-gradient(180deg, #ffd0ad 0%, #ff7a33 100%); }

.bkey {
  position: absolute;
  top: 6px;
  width: 30px;
  height: 62%;
  background: linear-gradient(180deg, #3a3a40 0%, #131316 100%);
  box-shadow: 0 3px 0 #000, inset 0 1px 0 rgba(255,255,255,0.12);
  z-index: 3;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 7px;
}
.bkey.down { background: linear-gradient(180deg, #d9601f 0%, #8f3708 100%); box-shadow: 0 1px 0 #000; transform: translateY(2px); }
.bkey.flash { background: linear-gradient(180deg, #7a4a2c 0%, #3d2413 100%); }
.bkey.down.flash { background: linear-gradient(180deg, #ff7a33 0%, #a8410a 100%); }

.key-cap {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  pointer-events: none;
}
.wkey .key-cap { color: #8b8474; }
.bkey .key-cap { color: #6e6a63; }
.wkey.root .key-cap { color: var(--accent); font-weight: 700; }

/* ---------- scope ---------- */
.scope { display: block; width: 100%; height: 74px; background: var(--panel-lo); border-radius: var(--radius); border: 1px solid var(--edge-soft); }

/* ---------- help ---------- */
.help-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  padding: 16px;
  font-size: 12px;
  color: var(--cream-dim);
}
.help-grid h4 { margin: 0 0 8px; font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); }
.help-grid dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; align-items: baseline; }
.help-grid dt { justify-self: start; }
.help-grid dd { margin: 0; color: var(--muted); }

kbd {
  font-family: var(--mono);
  font-size: 10px;
  background: #101013;
  border: 1px solid var(--edge);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 2px 6px;
  color: var(--cream);
  white-space: nowrap;
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 20px);
  background: #101013;
  border: 1px solid var(--edge);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 11px 18px;
  font-size: 12px;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 60;
  max-width: min(90vw, 460px);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* start overlay */
.gate {
  position: fixed;
  inset: 0;
  background: rgba(10,10,12,0.94);
  display: grid;
  place-items: center;
  z-index: 80;
  text-align: center;
  padding: 24px;
}
.gate.hidden { display: none; }
.gate h2 { font-size: 15px; letter-spacing: 0.3em; text-transform: uppercase; margin: 0 0 10px; }
.gate p { color: var(--muted); font-size: 13px; max-width: 380px; margin: 0 auto 22px; }
.gate .power {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 40px;
  padding: 14px 40px;
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  transition: background 0.15s ease, color 0.15s ease;
}
.gate .power:hover { background: var(--accent); color: #12100e; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding-top: 10px;
}
footer a { color: var(--cream-dim); }

/* ---------- responsive ---------- */
@media (max-width: 780px) {
  .machine { --label-col: 150px; }
  .track-name { display: none; }
  .brand h1 { font-size: 20px; }
  .transport { gap: 14px; padding: 14px; }
  .transport-group {
    padding: 0 0 14px;
    border-right: 0;
    border-bottom: 1px solid var(--edge-soft);
    width: 100%;
  }
  .transport-group:last-child { border-bottom: 0; padding-bottom: 0; }
  .readout { min-width: 92px; }
  .app { padding: 0 12px; }
  .masthead nav { gap: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}