:root {
  --bg: #13112a;
  --surface: #1d1a3c;
  --surface-2: #26224d;
  --border: #353066;
  --text: #ecebff;
  --muted: #9d99cc;
  --accent: #8f86ff;
  --accent-strong: #a9a2ff;
  --accent-ink: #12102a;
  --ok: #7fdc6a;
  --warn: #ffc95c;
  --danger: #ff7a7a;
  --radius: 12px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --display: "Chakra Petch", "Inter", system-ui, sans-serif;

  /* C64 palette (Pepto) for the header groups */
  --c64-blue: #40318d;
  --c64-lblue: #7869c4;
  --c-sys: #9f9f9f;   /* light grey: global */
  --c-mod: #bfce72;   /* yellow: performance & modulation */
  --c-osc: #b86962;   /* light red: oscillator */
  --c-flt: #94e089;   /* light green: filter */
  --c-amp: #67b6bd;   /* cyan: amplitude */
  --c-title: #883932; /* red */
  --on-ink: #14121f;  /* text on a pressed group-colored button */
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f2fb;
    --surface: #ffffff;
    --surface-2: #eceaf9;
    --border: #d9d6ef;
    --text: #1c1938;
    --muted: #625e8a;
    --accent: #5a4fd6;
    --accent-strong: #4a40c2;
    --accent-ink: #ffffff;
    --ok: #2e9b3a;
    --warn: #b77900;
    --danger: #cf3a3a;
    --c-sys: #6d6d6d;
    --c-mod: #8a9a2c;
    --c-osc: #b0544c;
    --c-flt: #3f9a33;
    --c-amp: #2f8f98;
    --on-ink: #ffffff;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 "Inter", system-ui, sans-serif;
}
a { color: var(--accent-strong); }
[hidden] { display: none !important; }

/* ---------- top ---------- */
.top {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 16px 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: flex-end;
  justify-content: space-between;
}
.top h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 32px);
  letter-spacing: 0.02em;
  margin: 0;
}
.top h1::before {
  content: "";
  display: inline-block;
  width: 0.55em; height: 0.85em;
  background: var(--accent);
  margin-right: 0.35em;
  vertical-align: -0.08em;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .top h1::before { animation: none; } }
.sub { margin: 2px 0 0; color: var(--muted); }

.conn { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.conn .field { min-width: 150px; }
.conn .field.narrow { min-width: 80px; }

main { max-width: 1180px; margin: 0 auto; padding: 8px 16px 48px; }

/* ---------- basics ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
  min-width: 0;
}
.card h2 {
  font-family: var(--display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.card-head h2 { margin: 0; }
.head-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field > span { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.field em { font-style: normal; opacity: 0.8; }
select, input[type="text"], input:not([type]) {
  font: inherit;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  min-height: 38px;
  width: 100%;
}
select:disabled { opacity: 0.55; }
input:focus-visible, select:focus-visible, button:focus-visible, .slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn {
  font: 600 14px/1 "Inter", system-ui, sans-serif;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 14px;
  min-height: 38px;
  cursor: pointer;
  white-space: nowrap;
  touch-action: manipulation;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: var(--accent-strong); }
.btn.ghost { background: transparent; }
.btn.small { min-height: 32px; padding: 0 10px; font-size: 13px; }
.btn.danger-ghost { background: transparent; color: var(--danger); border-color: color-mix(in srgb, var(--danger) 45%, transparent); }
.btn:disabled { opacity: 0.5; cursor: default; }
.count { font-weight: 500; opacity: 0.7; }

.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.dot.on { background: var(--ok); box-shadow: 0 0 6px var(--ok); }
.dot.err { background: var(--danger); }

.banner { border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; border: 1px solid; }
.banner.danger { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }
.banner.warn { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, transparent); }
.hint { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
.mono { font-family: var(--mono); }

.switch { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); cursor: pointer; user-select: none; }
.switch input { appearance: none; width: 34px; height: 20px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--border); position: relative; margin: 0; cursor: pointer; }
.switch input::after { content: ""; position: absolute; top: 2px; left: 2px; width: 14px; height: 14px; border-radius: 50%; background: var(--muted); transition: transform .15s; }
.switch input:checked { background: var(--accent); border-color: var(--accent); }
.switch input:checked::after { transform: translateX(14px); background: var(--accent-ink); }

/* ---------- C64 screen ---------- */
.screen-wrap {
  background: var(--c64-lblue);
  border-radius: var(--radius);
  padding: clamp(8px, 2.2vw, 22px);
  margin-bottom: 14px;
  container-type: inline-size;
}
.screen {
  margin: 0;
  background: var(--c64-blue);
  color: #fff;
  font: 700 2.3cqi/1.25 var(--mono);  /* 40 columns fill the width */
  padding: 0.6em 0.8em;
  letter-spacing: 0.02em;
  white-space: pre;
  overflow: hidden;
}
@supports not (font-size: 1cqi) { .screen { font-size: clamp(8px, 2.05vw, 22px); } }
.screen .title { color: #b86962; }
.screen .sys { color: var(--c64-sys, #9f9f9f); }
.screen .mod { color: #bfce72; }
.screen .osc { color: #b86962; }
.screen .flt { color: #94e089; }
.screen .amp { color: #67b6bd; }
.screen .eq { color: #6c6c6c; }
.screen .diff { color: #bfce72; }
.screen .val { color: #fff; }
.screen .dim { color: #8d84d8; }
.screen .rev { background: #fff; color: var(--c64-blue); }
.screen .pulse { animation: flash .35s ease-out; }
@keyframes flash { from { background: rgba(255,255,255,.35); } to { background: transparent; } }

/* ---------- patch bar ---------- */
.patchbar { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.patchbar .grow { flex: 1 1 200px; }
.patchbar .btns { display: flex; gap: 8px; flex-wrap: wrap; }
.patchbar .switch { min-height: 38px; }
.status { flex-basis: 100%; margin: 0; font-size: 13px; color: var(--muted); }
.status:empty { display: none; }
.status.warn { color: var(--warn); }
.status.ok { color: var(--ok); }

.lib-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.lib-list li { display: flex; align-items: center; gap: 6px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 6px 6px 6px 12px; }
.lib-list li.current { border-color: var(--accent); }
.lib-list .lib-name { flex: 1; min-width: 0; text-align: left; background: none; border: 0; color: var(--text); font: 600 14px "Inter", sans-serif; cursor: pointer; padding: 6px 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lib-list .lib-name small { display: block; color: var(--muted); font-weight: 400; font-size: 12px; }
.icon-btn { background: none; border: 0; color: var(--muted); cursor: pointer; min-width: 32px; min-height: 32px; border-radius: 6px; font-size: 15px; }
.icon-btn:hover { color: var(--text); background: var(--surface); }
.icon-btn.del:hover { color: var(--danger); }

/* ---------- control grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-areas: "sys mod flt flt" "amp mod flt flt" "voi voi voi voi";
  grid-template-rows: auto 1fr auto;
  gap: 0 14px;
  align-items: start;
}
.a-sys { grid-area: sys; } .a-mod { grid-area: mod; align-self: stretch; } .a-flt { grid-area: flt; align-self: stretch; } .a-amp { grid-area: amp; }
.grid .voices { grid-area: voi; }
@media (max-width: 1000px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-template-areas: "sys mod" "amp mod" "flt flt" "voi voi"; grid-template-rows: auto; } }
@media (max-width: 620px) { .grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "sys" "mod" "flt" "amp" "voi"; } }

/* filter graph */
.fgraph-wrap { margin: 0 0 14px; }
.fgraph { width: 100%; height: auto; display: block; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.fgraph .grid line { stroke: var(--border); stroke-width: 1; }
.fgraph .grid line.minor { stroke-dasharray: 2 4; opacity: .6; }
.fgraph .grid line.zero { stroke: var(--muted); opacity: .5; }
.fgraph .lbl { fill: var(--muted); font: 11px var(--mono); }
.fgraph .steps line { stroke: var(--c-flt); stroke-width: 1; opacity: .55; }
.fgraph .steps line.jump { stroke: var(--danger); opacity: 1; stroke-width: 1.5; }
.fgraph .band { fill: var(--c-flt); opacity: .12; }
.fgraph .dry { stroke: var(--muted); stroke-width: 1.5; stroke-dasharray: 6 4; }
.fgraph .fill { fill: var(--c-flt); opacity: .18; }
.fgraph .curve { fill: none; stroke: var(--c-flt); stroke-width: 2.5; stroke-linejoin: round; }
.fgraph .marker { stroke: var(--text); stroke-width: 1; stroke-dasharray: 3 3; opacity: .6; }
.fgraph .readout { fill: var(--text); font: 700 13px var(--mono); }
.fgraph .note { fill: var(--warn); font: 12px "Inter", sans-serif; }
.fgraph.unused .curve, .fgraph.unused .fill { opacity: .25; }
.fgraph-wrap .hint { margin-top: 6px; font-size: 12px; }
.a-flt .ctl-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
.a-flt .ctl-list .ctl:last-child { grid-column: 1 / -1; }
@media (max-width: 620px) { .a-flt .ctl-list { grid-template-columns: 1fr; } }

.g-sys { --g: var(--c-sys); }
.g-mod { --g: var(--c-mod); }
.g-flt { --g: var(--c-flt); }
.g-amp { --g: var(--c-amp); }
.g-osc { --g: var(--c-osc); }
.grid > .card { border-top: 3px solid var(--g, var(--border)); }
.grid > .card > h2, .grid > .card > .card-head h2 { color: var(--g, var(--text)); }
.voices { --g: var(--c-osc); }

.ctl-list { display: flex; flex-direction: column; gap: 14px; }
.ctl { --g2: var(--g); }
.ctl .lab { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.ctl .lab b { font-weight: 500; }
.ctl .lab output { font: 700 14px var(--mono); color: var(--text); }
.ctl.na { opacity: 0.38; }
.ctl.na .lab b::after { content: " ·  preset"; font-size: 11px; }
.ctl.part .lab b::after { content: " · voice 1"; font-size: 11px; color: var(--warn); }

/* slider: drag anywhere on the track (mouse, pen, touch) */
.slider {
  position: relative;
  height: 34px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  cursor: ew-resize;
  touch-action: none;
  overflow: hidden;
  user-select: none;
}
.slider .fill {
  position: absolute; inset: 0 auto 0 0;
  background: color-mix(in srgb, var(--g2) 55%, transparent);
  border-right: 2px solid var(--g2);
}
.slider .ticks { position: absolute; inset: 0; background-image: linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); pointer-events: none; }
.slider.active { border-color: var(--g2); }

.seg { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface-2); }
.seg button {
  flex: 1 1 0; min-width: 0;
  font: 700 13px var(--mono);
  color: var(--muted);
  background: none; border: 0; border-left: 1px solid var(--border);
  min-height: 34px; padding: 0 2px; cursor: pointer;
  touch-action: manipulation;
}
.seg button:first-child { border-left: 0; }
.seg .short { display: none; }
@media (max-width: 700px) { .seg .long { display: none; } .seg .short { display: inline; } }
.seg button[aria-pressed="true"] { background: var(--g2); color: var(--on-ink); }
.seg button:hover:not([aria-pressed="true"]) { color: var(--text); }

.ctl select { font: 700 14px var(--mono); }

/* ---------- voices ---------- */
.voice-grid {
  display: grid;
  grid-template-columns: 130px repeat(3, minmax(0, 1fr));
  gap: 10px 14px;
  align-items: center;
}
.voice-grid .vh { font: 600 13px var(--display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.voice-grid .rl { font-size: 13px; color: var(--g2); }
.voice-grid .rl small { display: block; color: var(--muted); font-size: 11px; }
.voice-grid .cell .lab { display: none; }
.voice-grid .cell { position: relative; }
.voice-grid .cell output { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); font: 700 13px var(--mono); pointer-events: none; color: var(--text); }
.voice-grid .cell.na, .voice-grid .rl.na { opacity: 0.38; }
.env { height: 44px; width: 100%; display: block; }
.env path { fill: color-mix(in srgb, var(--c-amp) 25%, transparent); stroke: var(--c-amp); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.linked .voice-grid .cell:not(.v0) { opacity: 0.7; }

@media (max-width: 700px) {
  .voice-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px 8px; }
  .voice-grid .rl { grid-column: 1 / -1; margin-top: 6px; }
  .voice-grid .corner { display: none; }
}

/* ---------- keyboard ---------- */
.piano { position: relative; height: 120px; display: flex; touch-action: none; user-select: none; }
.piano .w { flex: 1 1 0; background: #f4f3ff; border: 1px solid #b9b6d9; border-radius: 0 0 6px 6px; margin: 0 1px; position: relative; }
.piano .b { position: absolute; top: 0; height: 62%; background: #1b1838; border-radius: 0 0 4px 4px; z-index: 2; border: 1px solid #000; }
.piano .on { background: var(--accent) !important; }
.piano .w span { position: absolute; bottom: 6px; left: 0; right: 0; text-align: center; font: 600 10px var(--mono); color: #8f8cb0; }

.about summary { cursor: pointer; font-family: var(--display); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 14px; }
.about ul { margin: 12px 0 0; padding-left: 20px; color: var(--muted); }
.about li { margin-bottom: 6px; }
.log { font: 12px/1.5 var(--mono); max-height: 220px; overflow: auto; background: var(--surface-2); border-radius: 8px; padding: 10px; margin: 12px 0 0; white-space: pre-wrap; }
.foot { color: var(--muted); font-size: 13px; text-align: center; margin-top: 24px; }

/* ---------- locks and dice ---------- */
.ctl .lab-l { display: inline-flex; align-items: center; gap: 4px; min-width: 0; }
.lock {
  background: none; border: 0; padding: 0 2px; margin: -6px 0; min-width: 28px; min-height: 28px;
  font-size: 13px; line-height: 1; cursor: pointer; border-radius: 6px;
  opacity: 0.35; filter: grayscale(1); touch-action: manipulation;
}
.lock:hover { opacity: 0.8; }
.lock.on { opacity: 1; filter: none; }
.voice-grid .rl { display: flex; align-items: center; gap: 4px; }
.voice-grid .rl > span { min-width: 0; }
.icon-btn.dice { font-size: 18px; filter: grayscale(0.2); }
.icon-btn.dice:active { transform: rotate(-20deg) scale(0.92); }
.btn.dice-btn { font-size: 20px; padding: 0 12px; }
.btn.dice-btn:active { transform: rotate(-15deg); }
.grid > .card > .card-head { margin-bottom: 12px; }
@media (max-width: 700px) { .voice-grid .rl { justify-content: space-between; } }

/* ---------- editing on the screen ---------- */
.screen-wrap { position: relative; }
.screen .edit { cursor: ns-resize; touch-action: none; border-radius: 2px; }
.screen .edit:hover, .screen .edit.open { outline: 1px dashed rgba(255,255,255,.55); outline-offset: 1px; }
.screen.dragging, .screen.dragging .edit { cursor: ns-resize; }
.screen-hint { margin: -6px 0 14px; font-size: 12px; }
.pop {
  position: absolute; z-index: 20; width: min(340px, calc(100% - 16px));
  background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px; box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
.pop-t { font-size: 12px; color: var(--muted); margin: 2px 2px 6px; }
.pop-t:not(:first-child) { margin-top: 10px; }
.pop-opts { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 4px; }
.pop-opts.list { grid-template-columns: 1fr 1fr; max-height: 260px; overflow: auto; }
.pop-opts button {
  font: 700 13px var(--mono); color: var(--text); background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 6px; min-height: 34px; padding: 0 6px; cursor: pointer; touch-action: manipulation; text-align: center;
}
.pop-opts.list button { text-align: left; font-weight: 500; font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pop-opts button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.pop-opts button:disabled { opacity: .4; cursor: default; }
.pop-range { display: flex; align-items: center; gap: 10px; --g2: var(--accent); }
.pop-range .slider-wrap { flex: 1; }
.pop-range output { font: 700 14px var(--mono); min-width: 3ch; text-align: right; }

/* ---------- vibrato / tremolo pictures ---------- */
.modviz { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 16px; }
.viz-box { margin: 0; }
.viz-box figcaption { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.viz-box figcaption b { font-weight: 500; }
.viz-read { font: 700 12px var(--mono); color: var(--text); }
.viz-read.warn { color: var(--warn); }
.viz { width: 100%; height: 56px; display: block; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; }
.viz .mid { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.viz .wave { fill: none; stroke: var(--c-mod); stroke-width: 1.8; vector-effect: non-scaling-stroke; stroke-linejoin: round; }
.viz .cursor { stroke: var(--text); stroke-width: 1; opacity: .35; vector-effect: non-scaling-stroke; }
.viz-box.off .wave { opacity: .35; }
.viz-span { color: var(--muted); font-weight: 400; }
.viz.pw .shape { fill: none; stroke: var(--c-osc); stroke-width: 1.8; vector-effect: non-scaling-stroke; stroke-linejoin: miter; }
.viz.pw .wave { stroke: var(--c-osc); }
.viz.pw .band { fill: var(--c-osc); opacity: .12; }
.viz-box.off .shape { opacity: .45; }
.ctl .desc { margin: 6px 0 0; font-size: 12px; line-height: 1.35; color: var(--muted); }
.rl-note { display: block; font-size: 11px; color: var(--warn); }

/* ---------- setup ---------- */
.grid .setup { grid-column: 1 / -1; }
.setup-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px 16px; }
@media (max-width: 1000px) { .setup-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .setup-grid { grid-template-columns: minmax(0, 1fr); } }
.setup .ctl.na { opacity: 0.38; }
.setup .ctl.na .lab b::after { content: ""; }

/* TEMPORARY: patch tryout (tryout.js) */
.tryout { border-style: dashed; }
.tryout .hint { margin: 0 0 12px; }
.tryout-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 8px; }
.tryout-list li { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; display: flex; flex-direction: column; gap: 8px; }
.tryout-list li.kept { border-color: var(--ok); }
.tryout-top { display: flex; gap: 10px; align-items: flex-start; }
.tryout-keep { display: flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11px; color: var(--muted); cursor: pointer; padding-top: 2px; }
.tryout-keep input { width: 20px; height: 20px; margin: 0; accent-color: var(--ok); cursor: pointer; }
.tryout-name { flex: 1; min-width: 0; }
.tryout-name small { display: block; color: var(--muted); font-size: 12px; line-height: 1.35; margin-top: 2px; }
.tryout-name .badge { margin-left: 6px; font: 600 11px var(--mono); color: var(--warn); }
.tryout-btns { display: flex; flex-direction: column; gap: 4px; }
.tryout-btns .btn { min-height: 28px; }
.tryout-note { font-size: 13px; min-height: 32px; padding: 4px 8px; }
@media (max-width: 420px) { .tryout-list { grid-template-columns: 1fr; } }