:root {
  --bg: #0e1116;
  --panel: #171b22;
  --panel-2: #1d222b;
  --line: #2a303a;
  --text: #e6e8ec;
  --dim: #8a929e;
  --accent: #e8532a;
  --teal: #4fb6c4;
  --warn: #f2c14e;
  --mono: 'IBM Plex Mono', Consolas, monospace;
  --c1: #4fc3ff;
  --c2: #ffb347;
  --c3: #c58cff;
  --la: #ff5fa2;
  --lb: #ffd84f;
  --lc: #6be0ff;
  --radius: 4px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 Inter, "Space Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1, h2 { margin: 0; font-weight: 650; }
h2 { font-size: 14px; letter-spacing: .02em; }
.dim { color: var(--dim); }
.small { font-size: 12px; }

/* ---------- header ---------- */
.top {
  display: flex; flex-wrap: wrap; gap: 12px 24px;
  align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: #0f1219;
  position: sticky; top: 0; z-index: 10;
}
.brand h1 { font-size: 22px; letter-spacing: .04em; }
.brand h1 span { color: var(--accent); }
.brand p { margin: 0; color: var(--dim); font-size: 12px; }
.top-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

button, select { font: inherit; color: inherit; }
select {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 7px; padding: 4px 6px;
}
.toggle, .seg button, .wave-btn {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 5px 10px;
  cursor: pointer;
  user-select: none;
}
.toggle:hover, .seg button:hover, .wave-btn:hover { border-color: #3d4760; }
.toggle.on, .seg button.on, .wave-btn.on {
  background: rgba(232, 83, 42, .15); color: var(--accent); border-color: var(--accent); font-weight: 600;
}
.play-btn.on { background: rgba(123, 201, 111, .15); border-color: #7bc96f; color: #7bc96f; }
.seg { display: inline-flex; }
.seg button { border-radius: 0; }
.seg button:first-child { border-radius: 7px 0 0 7px; }
.seg button:last-child { border-radius: 0 7px 7px 0; }

.mini { display: inline-flex; align-items: center; gap: 6px; color: var(--dim); font-size: 12px; }
.mini input[type=range] { width: 110px; }
.mini output { color: var(--text); min-width: 52px; font-variant-numeric: tabular-nums; }
.pill { padding: 3px 8px; border: 1px solid var(--line); border-radius: 999px; font-size: 12px; }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  padding: 16px;
  max-width: 1500px;
  margin: 0 auto;
}
.workspace { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.learn { display: flex; flex-direction: column; gap: 16px; }
.learn .explain { position: sticky; top: 76px; }
body.play-mode .layout { grid-template-columns: minmax(0, 1fr); }
body.play-mode .learn,
body.play-mode .learn-only { display: none; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
}
.panel-head {
  display: flex; flex-wrap: wrap; gap: 8px 16px;
  align-items: center; justify-content: space-between;
  margin-bottom: 10px;
}
.head-controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.sub-controls { margin-bottom: 10px; gap: 8px 18px; }

/* ---------- presets ---------- */
.preset-cats { display: grid; gap: 8px; }
.preset-cat { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.preset-cat .cat-name {
  width: 92px; flex: none; font-size: 12px; color: var(--dim); text-transform: uppercase; letter-spacing: .06em;
}
.preset-btn {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 999px;
  padding: 4px 12px; cursor: pointer; font-size: 13px;
}
.preset-btn:hover { border-color: var(--accent); }
.preset-btn.on { background: var(--accent); border-color: var(--accent); color: #0e1116; font-weight: 600; }
.preset-desc { margin-top: 10px; font-size: 13px; color: var(--dim); }
.preset-desc b { color: var(--text); }

/* ---------- oscillator panels ---------- */
.osc-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.osc {
  border-top: 3px solid var(--oc);
  background: var(--obg, var(--panel));
  transition: background-color .25s linear;
}
.osc[data-i="0"] { --oc: var(--c1); }
.osc[data-i="1"] { --oc: var(--c2); }
.osc[data-i="2"] { --oc: var(--c3); }
.osc h2 { color: var(--oc); text-shadow: 0 1px 2px #000; }
.osc.silent .scope.wave { opacity: .45; }
.osc .flags { display: flex; gap: 6px; }
.osc .flags .toggle { padding: 2px 8px; font-size: 12px; }
.osc .flags .toggle.mute.on { background: var(--warn); border-color: var(--warn); color: #2a0e00; }
.osc .sliders label, .osc .checks, .osc .cap { color: #b6bdcc; }

.waves { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; margin: 8px 0; }
.wave-btn { padding: 4px 0; font-size: 11px; text-align: center; }

.keyfix { display: flex; margin: 8px 0 6px; }
.keyfix button { flex: 1; font-size: 12px; padding: 4px 6px; }
.osc .row-hz { display: none; }
.osc.fixed .row-hz { display: grid; }
.osc.fixed .row-coarse { display: none; }

.sliders { display: grid; gap: 6px; }
.sliders label {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 74px;
  align-items: center; gap: 8px;
  font-size: 12px; color: var(--dim);
  border-radius: 6px;
}
.sliders label output { order: 3; text-align: right; color: var(--text); font-variant-numeric: tabular-nums; }
.sliders label input { order: 2; }
.checks { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 8px; font-size: 12px; color: var(--dim); }
.checks label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }

input[type=range] { width: 100%; accent-color: var(--accent); cursor: pointer; }
.osc input[type=range] { accent-color: var(--oc); }

/* knob being moved by automation */
.auto-a { animation: glowA 1s ease-in-out infinite alternate; }
.auto-b { animation: glowB 1s ease-in-out infinite alternate; }
.auto-a input[type=range] { accent-color: var(--la) !important; }
.auto-b input[type=range] { accent-color: var(--lb) !important; }
@keyframes glowA { from { box-shadow: 0 0 0 1px var(--la), 0 0 4px rgba(255,95,162,.3); } to { box-shadow: 0 0 0 1px var(--la), 0 0 16px rgba(255,95,162,.7); } }
@keyframes glowB { from { box-shadow: 0 0 0 1px var(--lb), 0 0 4px rgba(255,216,79,.3); } to { box-shadow: 0 0 0 1px var(--lb), 0 0 16px rgba(255,216,79,.7); } }
/* lane C and modulators */
.auto-c { animation: glowC 1s ease-in-out infinite alternate; }
.auto-m { animation: glowM 0.8s ease-in-out infinite alternate; }
.auto-c input[type=range] { accent-color: #6be0ff !important; }
.auto-m input[type=range] { accent-color: #e8532a !important; }
@keyframes glowC { from { box-shadow: 0 0 0 1px #6be0ff, 0 0 4px rgba(107,224,255,.3); } to { box-shadow: 0 0 0 1px #6be0ff, 0 0 16px rgba(107,224,255,.7); } }
@keyframes glowM { from { box-shadow: 0 0 0 1px #e8532a, 0 0 4px rgba(124,243,201,.3); } to { box-shadow: 0 0 0 1px #e8532a, 0 0 16px rgba(124,243,201,.7); } }
@media (prefers-reduced-motion: reduce) {
  .auto-c, .auto-m { animation: none; box-shadow: 0 0 0 1px #e8532a; }
  .auto-a { animation: none; box-shadow: 0 0 0 1px var(--la); }
  .auto-b { animation: none; box-shadow: 0 0 0 1px var(--lb); }
}

.readout {
  margin-top: 8px; padding: 8px; border-radius: 7px; background: rgba(6, 8, 12, .6);
  font: 12px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: #a9b1c2;
}
.readout b { color: var(--text); font-weight: 600; }

.harm-wrap { margin-top: 8px; }
.harm-wrap .cap { font-size: 11px; margin-bottom: 2px; }

/* ---------- canvases ---------- */
.scope {
  display: block; width: 100%; height: 110px;
  background: #0a0c11; border: 1px solid var(--line); border-radius: 7px;
}
.scope.wave { height: 120px; }
.scope.speed { height: 66px; margin-top: 8px; background: rgba(6, 8, 12, .55); }
.scope.tall { height: 200px; }
.scope.short { height: 84px; margin-top: 10px; }
.scope.harm { height: 48px; background: rgba(6, 8, 12, .55); }
.scope.lane { height: 96px; touch-action: none; cursor: crosshair; }
.scope.seq { height: 260px; cursor: pointer; touch-action: manipulation; }
.ring { display: block; width: 260px; height: 260px; flex: none; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
figure { margin: 0; }
figcaption { font-size: 11px; color: var(--dim); margin-top: 4px; }

.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 6px; font-size: 12px; color: var(--dim); }
.lg::before { content: ""; display: inline-block; width: 14px; height: 3px; margin-right: 6px; vertical-align: middle; border-radius: 2px; }
.lg1::before { background: var(--c1); }
.lg2::before { background: var(--c2); }
.lg3::before { background: var(--c3); }
.lgsum::before { background: #fff; height: 4px; }

.analysis {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 8px; margin-top: 10px;
}
.analysis .card { background: #10131b; border-radius: 7px; padding: 8px; font-size: 12px; color: var(--dim); }
.analysis .card b { color: var(--text); }
.analysis .card.hot { outline: 1px solid var(--accent); }

/* ---------- tone (filter + envelope) ---------- */
.tone-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; }

/* ---------- sequencer ---------- */
.seq-grid { display: flex; gap: 16px; align-items: flex-start; }
.seq-grid .seq { flex: 1 1 auto; min-width: 0; }

/* ---------- automation ---------- */
.lanes { display: grid; gap: 12px; }
.lane { border: 1px solid var(--line); border-radius: 8px; padding: 8px; background: #11141c; }
.lane[data-l="0"] { --lc: var(--la); }
.lane[data-l="1"] { --lc: var(--lb); }
.lane[data-l="2"] { --lc: #6be0ff; }
.lane-head { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; margin-bottom: 8px; font-size: 12px; color: var(--dim); }
.lane-head .lane-on.on { background: var(--lc); border-color: var(--lc); color: #1a0710; }
.lane-head .shapes { display: inline-flex; flex-wrap: wrap; gap: 4px; }
.lane-head .shapes button { padding: 3px 7px; font-size: 12px; }
.lane-head .shapes button.on { background: var(--lc); border-color: var(--lc); color: #1a0710; }
.lane-head label { display: inline-flex; gap: 6px; align-items: center; }
.lane-head input[type=range] { width: 80px; accent-color: var(--lc); }
.macros .toggle { font-size: 12px; padding: 4px 9px; }

/* ---------- keyboard ---------- */
.keyboard {
  position: relative; height: 130px; user-select: none; touch-action: none;
  display: flex;
}
.key {
  position: relative; flex: 1 1 0;
  background: linear-gradient(#f4f5f8, #d9dce4);
  border: 1px solid #222; border-radius: 0 0 6px 6px;
  cursor: pointer;
  display: flex; align-items: flex-end; justify-content: center;
  font-size: 10px; color: #555; padding-bottom: 4px;
}
.key.black {
  position: absolute; z-index: 2; height: 62%;
  background: linear-gradient(#2b2f3a, #10121a);
  color: #aaa; border-color: #000;
}
.key.down { background: var(--accent); color: #0e1116; }
.hint { color: var(--dim); font-size: 12px; margin: 8px 0 0; }
kbd {
  font: 11px ui-monospace, monospace; padding: 1px 5px; border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 4px; background: var(--panel-2); color: var(--text);
}

/* ---------- learn pane ---------- */
.explain-title { font-weight: 650; color: var(--accent); margin: 8px 0 4px; }
.explain-body { color: var(--text); }
.explain-body p { margin: 0 0 8px; }
.explain-live {
  margin-top: 8px; padding: 8px; border-radius: 7px; background: #10131b;
  font: 12px/1.55 ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: #cfe;
  white-space: pre-wrap; word-break: break-word;
}
.explain-live:empty { display: none; }

.lesson-list { margin: 8px 0; padding-left: 0; list-style: none; display: grid; gap: 6px; }
.lesson-list button {
  width: 100%; text-align: left; background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 7px; padding: 7px 10px; cursor: pointer;
}
.lesson-list button:hover { border-color: #3d4760; }
.lesson-list button.on { border-color: var(--accent); color: var(--accent); }
.lesson-text { font-size: 13px; }
.lesson-text p { margin: 0 0 8px; }
.lesson-text:empty { display: none; }

[data-info]:hover { outline: 1px dashed rgba(94, 230, 196, .25); outline-offset: 2px; border-radius: 4px; }
body.play-mode [data-info]:hover { outline: none; }

.foot { color: var(--dim); font-size: 12px; text-align: center; padding: 12px 16px 24px; }

/* ---------- links ---------- */
a { color: var(--accent); }
.cdl-link { color: var(--dim); text-decoration: none; border-bottom: 1px dotted var(--dim); }
.cdl-link:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- signal chain ---------- */
.chain {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 10px;
  --lvl: 0;
}
.chain button {
  background: rgba(79,182,196, calc(0.08 + var(--lvl) * 0.35)); border: 1px solid rgba(79,182,196,.45);
  color: var(--text); border-radius: 999px; padding: 3px 10px; font-size: 12px; cursor: pointer;
  box-shadow: 0 0 calc(var(--lvl) * 14px) rgba(79,182,196,.6);
}
.chain button.bypass { background: transparent; border-color: var(--line); color: var(--dim); box-shadow: none; text-decoration: line-through; }
.chain .arrow { color: var(--dim); font-size: 12px; }

/* ---------- effects ---------- */
.fx-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.fx { border-top: 3px solid #e8532a; transition: opacity .2s; }
#gator { border-top-color: #57e389; }
#echo { border-top-color: #ff7eb6; }
#reverb { border-top-color: #8fa8ff; }
.fx.fx-off .fxcanvas { opacity: .55; }
.fx .fx-on { min-width: 52px; }
.scope.fxcanvas { height: 120px; margin-bottom: 8px; }
.scope.gate-canvas { cursor: pointer; touch-action: none; }
.scope.modcanvas { height: 56px; }
.scope.quizcanvas { height: 80px; margin: 6px 0; }
.chip-row { display: flex; flex-wrap: wrap; gap: 4px 6px; align-items: center; margin: 6px 0; }
.chip-row .toggle { padding: 3px 8px; font-size: 12px; }
.chip-row .seg button { padding: 3px 8px; font-size: 12px; }
.chip-row .dim { margin-right: 4px; }
.modrow { border: 1px solid var(--line); border-radius: 8px; padding: 8px; background: #11141c; --lc: #e8532a; }
.modrow .mod-on.on, .modrow .shapes button.on { background: #e8532a; border-color: #e8532a; color: #0e1116; }
.modrow output { color: var(--text); min-width: 50px; font-size: 12px; }
.inspire { background: linear-gradient(90deg, #3b2a6b, #1f4f63); border-color: #6c5bd4; }

/* ---------- my sounds + quiz ---------- */
.save-row { display: flex; gap: 6px; margin-top: 8px; }
.save-row input[type=text] {
  flex: 1; min-width: 0; background: #10131b; color: var(--text); border: 1px solid var(--line); border-radius: 7px; padding: 5px 8px; font: inherit;
}
.save-row .toggle { flex: none; }
.rec.rec-on { background: #e5484d; border-color: #e5484d; color: #fff; animation: glowB 1s infinite alternate; }
.dl { display: inline-block; margin-top: 8px; text-decoration: none; color: var(--text); }
.sounds-list { list-style: none; padding: 0; margin: 6px 0 0; display: grid; gap: 4px; }
.sounds-list li { display: flex; gap: 4px; }
.sounds-list li .toggle:first-child { flex: 1; text-align: left; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sounds-list .del { flex: none; }
.quiz .toggle.right { background: #2fbf71; border-color: #2fbf71; color: #04210e; }
.quiz .toggle.wrong { background: #e5484d; border-color: #e5484d; color: #fff; }
#quizFeedback .toggle { margin-left: 6px; }

/* ---------- responsive ---------- */
@media (max-width: 1150px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .learn .explain { position: static; }
}
@media (max-width: 1250px) {
  .fx-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  #reverb { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .osc-row, .fx-row { grid-template-columns: minmax(0, 1fr); }
  #reverb { grid-column: auto; }
  .two, .tone-grid { grid-template-columns: minmax(0, 1fr); }
  .seq-grid { flex-direction: column; align-items: center; }
  .seq-grid .seq { width: 100%; }
}
@media (max-width: 520px) {
  .top { position: static; }
  .layout { padding: 12px 16px; }
  .mini input[type=range] { width: 80px; }
  .keyboard { height: 110px; }
  .preset-cat .cat-name { width: 100%; }
  .ring { width: 220px; height: 220px; }
  .scope.seq { height: 220px; }
}

/* ---------- Circuit Drift Labs identity ---------- */
h1, h2, .pill, output, kbd, .cat-name, .foot, .mini { font-family: var(--mono); }
h2 { font-size: 11px; text-transform: uppercase; letter-spacing: .1em; font-weight: 600; display: flex; align-items: center; gap: 8px; }
h2::before { content: ""; width: 2px; height: 12px; background: var(--accent); flex: none; }
.toggle, .seg button, .wave-btn { border-radius: 4px; font: 500 11px var(--mono); letter-spacing: .04em; transition: border-color .15s, background .15s; }
.seg button:first-child { border-radius: 4px 0 0 4px; }
.seg button:last-child { border-radius: 0 4px 4px 0; }
.toggle:hover, .seg button:hover, .wave-btn:hover { border-color: var(--teal); }
.toggle:disabled, .seg button:disabled { opacity: .35; cursor: default; }
.panel { box-shadow: 0 2px 8px rgba(0, 0, 0, .55); }
.top { background: var(--bg); position: sticky; }
.top::before { content: ""; position: absolute; left: 0; top: 0; width: 2px; height: 18px; background: var(--accent); transform: skew(-45deg); transform-origin: top; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { display: block; flex: none; }
.brand h1 { font: 600 20px var(--mono); letter-spacing: .02em; }
.brand h1 span { color: var(--accent); }
.brand p { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; }
.brand a, .cdl-link, .foot a, .hint a { color: var(--teal); }
input[type=range] { accent-color: var(--accent); }
.help-brand { display: flex; gap: 12px; align-items: center; padding-bottom: 12px; margin-bottom: 12px; border-bottom: 1px solid var(--line); }
.help-brand img { flex: none; }
.help-brand b { display: block; font: 600 13px var(--mono); }
.help-brand span { display: block; font: 400 10px var(--mono); color: var(--dim); letter-spacing: .06em; }
.help-brand a { font: 500 11px var(--mono); color: var(--teal); }
.filebtn { display: inline-block; }
.foot { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: center; justify-content: center; font-size: 11px; color: var(--dim); padding: 24px 16px; border-top: 1px solid var(--line); }
.foot img { vertical-align: middle; }
.foot::after { content: "v1.0"; font-size: 9px; color: var(--dim); }