/* ==========================================================================
   DIY KIT — Kit Simulator (dk theme)
   /simulator/demo and /kits/{slug}/simulator.

   Uses the dk tokens (--bg, --bg2, --bg3, --fg, --fg2, --fg3, --primary,
   --border, --radius) so it follows the light/dark toggle like every other
   page. The bench (the SVG canvas) stays dark in both themes on purpose: the
   board and parts are drawn in the engine with fixed colours, and a dark
   bench is what every circuit simulator's viewport looks like.
   ========================================================================== */

.dk-sim { padding: 28px 0 56px; }
.dk-sim__crumbs { display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
  font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--fg3); margin-bottom: 18px; }
.dk-sim__crumbs a { color: var(--fg3); text-decoration: none; }
.dk-sim__crumbs a:hover { color: var(--primary); }

.dk-sim__head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 28px; align-items: end; margin-bottom: 18px; }
.dk-sim__title { margin: 6px 0 8px; font-size: clamp(24px, 3vw, 34px); line-height: 1.1; letter-spacing: -.02em; color: var(--fg); }
.dk-sim__lead { margin: 0; max-width: 62ch; font-size: 14.5px; line-height: 1.6; color: var(--fg2); }
.dk-sim__badges { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.dk-sim__badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border: 1px solid var(--border);
  border-radius: 999px; background: var(--bg2); color: var(--fg2); font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .04em; }
.dk-sim__badge b { color: var(--fg); font-weight: 600; }
.dk-sim__badge--demo { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); color: var(--primary); }

/* ---- Project tabs ---- */
.dk-sim__projects { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; padding: 12px 0 16px; border-top: 1px solid var(--border2); }
.dk-sim__projects-label { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg3); margin-right: 4px; }
.dk-sim__proj { font-family: 'JetBrains Mono', monospace; font-size: 11.5px; font-weight: 600; letter-spacing: .02em; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg2); color: var(--fg2); cursor: pointer; transition: all .15s; }
.dk-sim__proj:hover { color: var(--fg); border-color: var(--fg3); }
.dk-sim__proj.is-active { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.dk-sim__proj .n { opacity: .6; margin-right: 6px; }
.dk-sim__proj-main, .dk-sim__proj-nocode { display: inline-block; margin-left: 6px; padding: 1px 6px; border-radius: 999px; font-size: 9.5px; letter-spacing: .06em; text-transform: uppercase; vertical-align: 1px; }
.dk-sim__proj-main { background: color-mix(in srgb, var(--primary) 18%, transparent); color: var(--primary); }
.dk-sim__proj.is-active .dk-sim__proj-main { background: color-mix(in srgb, var(--primary-fg) 22%, transparent); color: var(--primary-fg); }
.dk-sim__proj-nocode { background: color-mix(in srgb, var(--fg3) 18%, transparent); color: var(--fg3); }
.dk-sim__proj.is-active .dk-sim__proj-nocode { color: var(--primary-fg); background: color-mix(in srgb, var(--primary-fg) 22%, transparent); }

/* ---- Workspace grid ---- */
.dk-sim__grid { display: grid; grid-template-columns: 220px minmax(0, 1fr) minmax(320px, 34%); gap: 14px; align-items: start; }
.dk-sim__pane { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.dk-sim__pane-head { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border2);
  font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg3); }
.dk-sim__pane-head .pill { margin-left: auto; padding: 3px 8px; border: 1px solid var(--border); border-radius: 999px; color: var(--fg2); text-transform: none; letter-spacing: 0; font-size: 10.5px; }

/* ---- Parts palette ---- */
.dk-sim__parts { position: sticky; top: 84px; }
.dk-sim__board { padding: 10px 12px; border-bottom: 1px solid var(--border2); display: flex; flex-direction: column; gap: 6px; }
.dk-sim__board label { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg3); }
.dk-sim__board select { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--fg);
  font-family: 'JetBrains Mono', monospace; font-size: 12px; }
.dk-sim__board select:disabled { opacity: .7; }
.dk-sim__group { padding: 8px 12px 4px; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--fg3); }
.dk-sim__tiles { display: flex; flex-direction: column; gap: 6px; padding: 4px 10px 12px; max-height: calc(100vh - 260px); overflow: auto; }
.dk-sim__tile { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 8px 10px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--fg); cursor: pointer; transition: all .15s; }
.dk-sim__tile:hover { border-color: var(--primary); transform: translateY(-1px); }
.dk-sim__tile:active { transform: translateY(0); }
.dk-sim__tile .sw { width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0; box-shadow: 0 0 0 2px color-mix(in srgb, var(--fg) 8%, transparent); }
.dk-sim__tile .nm { font-size: 13px; font-weight: 600; line-height: 1.2; }
.dk-sim__tile .pn { display: block; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--fg3); margin-top: 2px; }
.dk-sim__tile .plus { margin-left: auto; font-family: 'JetBrains Mono', monospace; color: var(--fg3); font-size: 14px; }
.dk-sim__tile:hover .plus { color: var(--primary); }
.dk-sim__palette-note { padding: 0 12px 12px; font-size: 11.5px; line-height: 1.5; color: var(--fg3); }

/* ---- Bench ---- */
.dk-sim__toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 10px 12px; border-bottom: 1px solid var(--border2); }
.dk-sim__toolbar .spacer { flex: 1; }
.dk-sim__tb { font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  padding: 8px 14px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--fg2); cursor: pointer; transition: all .15s; display: inline-flex; align-items: center; gap: 6px; }
.dk-sim__tb:hover { color: var(--fg); border-color: var(--fg3); }
.dk-sim__tb[disabled] { opacity: .4; cursor: not-allowed; }
.dk-sim__tb--run { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.dk-sim__tb--run:hover { color: var(--primary-fg); opacity: .92; }
.dk-sim__tb--stop { color: #e11d48; border-color: color-mix(in srgb, #e11d48 40%, var(--border)); }
.dk-sim__tb--stop:hover { color: #fff; background: #e11d48; border-color: #e11d48; }
.dk-sim__tb--wire.active { background: #f59e0b; color: #1a1200; border-color: #f59e0b; }
.dk-sim__status { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--fg3); padding: 4px 10px; border: 1px solid var(--border); border-radius: 999px; }

.ksim-canvas-wrap { position: relative; min-height: min(72vh, 760px); background: radial-gradient(circle at 20% 0%, #14213a 0%, #0b1220 62%); border-radius: 0; }
.ksim-canvas { width: 100%; height: 100%; display: block; touch-action: none; min-height: inherit; }
.ksim-fps { position: absolute; top: 10px; right: 12px; padding: 3px 9px; background: rgba(11,18,32,.75); border: 1px solid #243049; border-radius: 999px;
  font-family: 'JetBrains Mono', monospace; font-size: 10.5px; color: #94a3b8; pointer-events: none; font-variant-numeric: tabular-nums; }
.ksim-handle { cursor: grab; } .ksim-handle:active { cursor: grabbing; }
.ksim-tooltip { position: absolute; pointer-events: none; transform: translate(-50%, -130%); background: #0b1220; border: 1px solid #334155; color: #e5edff;
  padding: 5px 9px; border-radius: 6px; font-family: 'JetBrains Mono', monospace; font-size: 11px; white-space: nowrap; opacity: 0; transition: opacity .12s; z-index: 5; }
.ksim-tooltip.show { opacity: 1; }
.ksim-canvas .wire-on { stroke-dasharray: 8 6; animation: ksimFlow .9s linear infinite; }
@keyframes ksimFlow { to { stroke-dashoffset: -28; } }
.ksim-pin-state { pointer-events: none; font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 700; fill: #22d3ee; }
.ksim-canvas-wrap.wire-mode { cursor: crosshair; }
.ksim-canvas-wrap.wire-mode .ksim-pin-hit { cursor: crosshair; }
.ksim-canvas-wrap.wire-mode circle.ksim-pin { stroke-width: 2.5; }
.ksim-pin-armed { stroke: #facc15 !important; stroke-width: 4 !important; filter: drop-shadow(0 0 6px rgba(250,204,21,.8)); }
.ksim-wire-preview { stroke: #facc15; stroke-width: 2.5; stroke-dasharray: 6 4; opacity: .85; pointer-events: none; }
.ksim-wire-banner { position: absolute; top: 46px; left: 50%; transform: translateX(-50%); z-index: 20; background: rgba(11,18,32,.95); border: 1px solid #facc15;
  border-radius: 6px; padding: 6px 14px; font-size: 12px; color: #fde047; font-weight: 600; pointer-events: none; }
.ksim-particle { pointer-events: none; }

/* sensor mini-controls floating over the bench */
.ksim-controls { position: absolute; left: 12px; bottom: 12px; right: 12px; display: flex; flex-wrap: wrap; gap: 8px; pointer-events: none; }
.ksim-control { pointer-events: auto; background: rgba(11,18,32,.88); border: 1px solid #334155; border-radius: 8px; padding: 7px 10px;
  display: flex; align-items: center; gap: 8px; font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: #e5edff; }
.ksim-control input[type=range] { width: 130px; accent-color: var(--primary); }
.ksim-control button.btn-tactile { background: #1e293b; color: #fff; border: 1px solid #334155; padding: 5px 12px; border-radius: 6px; font-weight: 700; font-size: 11.5px; cursor: pointer; font-family: inherit; }
.ksim-control button.btn-tactile.pressed { background: var(--primary); color: var(--primary-fg); }
.ksim-spark { width: 80px; height: 18px; display: block; }

/* presets under a sensor slider (12 Oct 2026) */
.ksim-control.has-presets { flex-wrap: wrap; }
.ksim-presets { flex-basis: 100%; display: flex; flex-wrap: wrap; gap: 4px; margin-top: 2px; }
.ksim-preset { background: #0f172a; color: #cbd5e1; border: 1px solid #334155; border-radius: 999px; padding: 2px 9px; font: 600 10.5px/1.5 'JetBrains Mono', monospace; cursor: pointer; }
.ksim-preset:hover { border-color: var(--primary); color: #fff; }
.ksim-preset.is-on { background: var(--primary); border-color: var(--primary); color: var(--primary-fg, #fff); }

/* "What the board sees" - live tiles from the sketch's Serial output (12 Oct 2026) */
.ksim-readings { position: absolute; top: 12px; left: 12px; width: min(46%, 360px); max-height: 52%; overflow: auto;
  background: rgba(11,18,32,.9); border: 1px solid #334155; border-radius: 10px; padding: 9px 10px 10px; z-index: 3;
  font-family: 'JetBrains Mono', monospace; color: #e5edff; box-shadow: 0 10px 30px -16px rgba(0,0,0,.8); }
.ksim-readings__head { font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); display: flex; flex-direction: column; gap: 1px; margin-bottom: 7px; }
.ksim-readings__head span { font-size: 9.5px; letter-spacing: 0; text-transform: none; color: #94a3b8; }
.ksim-readings__banner { font-size: 11.5px; font-weight: 700; padding: 6px 9px; border-radius: 7px; margin-bottom: 7px; border: 1px solid transparent; animation: ksimBannerIn .25s ease; }
.ksim-readings__banner.is-info { background: rgba(14,165,233,.14); border-color: #0ea5e9; color: #7dd3fc; }
.ksim-readings__banner.is-warn { background: rgba(245,158,11,.14); border-color: #f59e0b; color: #fcd34d; }
.ksim-readings__banner.is-bad  { background: rgba(239,68,68,.16);  border-color: #ef4444; color: #fca5a5; }
.ksim-readings__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 6px; }
.ksim-reading { background: #0f172a; border: 1px solid #243049; border-radius: 7px; padding: 6px 8px 7px; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.ksim-reading .k { font-size: 9.5px; color: #94a3b8; letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ksim-reading .v { font-size: 14px; font-weight: 700; color: #fff; line-height: 1.1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ksim-reading .bar { display: block; height: 4px; border-radius: 2px; background: #1e293b; overflow: hidden; margin-top: 2px; }
.ksim-reading .bar i { display: block; height: 100%; background: var(--primary); transition: width .35s ease; }
.ksim-reading.is-good .v { color: #4ade80; }
.ksim-reading.is-warn .v { color: #fcd34d; }
.ksim-reading.is-bad  .v { color: #f87171; }
.ksim-reading.is-good { border-color: rgba(74,222,128,.45); }
.ksim-reading.is-warn { border-color: rgba(252,211,77,.5); }
.ksim-reading.is-bad  { border-color: rgba(248,113,113,.55); background: rgba(127,29,29,.25); }
.ksim-reading.wide { grid-column: 1 / -1; }
.ksim-reading.wide .v { white-space: normal; font-size: 13px; line-height: 1.25; }
.ksim-readings__banner.is-good { background: rgba(74,222,128,.14); border-color: #22c55e; color: #86efac; }
.ksim-reading.flash { animation: ksimFlash .6s ease; }
@keyframes ksimFlash { 0% { box-shadow: inset 0 0 0 1px var(--primary), 0 0 0 2px rgba(16,185,129,.25); } 100% { box-shadow: none; } }
@keyframes ksimBannerIn { from { transform: translateY(-4px); opacity: 0; } to { transform: none; opacity: 1; } }
@media (max-width: 640px) { .ksim-readings { width: calc(100% - 24px); max-height: 45%; } }

/* live signal chart */
.ksim-chart { display: none; background: #0b1220; border-top: 1px solid #243049; padding: 6px 12px 8px; }
.ksim-chart.show { display: block; }
.ksim-chart .head { display: flex; align-items: center; gap: 10px; font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: #94a3b8; margin-bottom: 4px; }
.ksim-chart .legend { display: flex; gap: 10px; flex-wrap: wrap; text-transform: none; letter-spacing: 0; }
.ksim-chart .legend .swatch { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 4px; vertical-align: middle; }
.ksim-chart .clear-btn { margin-left: auto; background: transparent; border: 1px solid #334155; color: #94a3b8; border-radius: 4px; padding: 2px 8px; font-size: 10px; cursor: pointer; font-family: inherit; }
.ksim-chart svg { width: 100%; height: 64px; display: block; }

/* circuit info card (what the loaded project does) */
.ksim-circuit-info { display: none; gap: 14px; align-items: flex-start; padding: 14px 16px; border-top: 1px solid var(--border2); background: var(--bg2); color: var(--fg); line-height: 1.55; }
.ksim-circuit-info.show { display: flex; }
.ksim-circuit-info .ic { width: 34px; height: 34px; border-radius: 8px; flex-shrink: 0; background: var(--primary); color: var(--primary-fg);
  display: flex; align-items: center; justify-content: center; font-family: 'JetBrains Mono', monospace; font-weight: 700; }
.ksim-circuit-info .body { flex: 1; min-width: 0; }
.ksim-circuit-info .body h3 { margin: 0 0 4px; font-size: 16px; color: var(--fg); }
.ksim-circuit-info .body p { margin: 0; color: var(--fg2); font-size: 13.5px; }
.ksim-circuit-info .body .real-world { margin-top: 8px; padding: 8px 10px; border-left: 2px solid var(--primary); background: color-mix(in srgb, var(--primary) 8%, transparent); color: var(--fg2); font-size: 12.5px; border-radius: 0 4px 4px 0; }
.ksim-circuit-info .body .meta { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.ksim-circuit-info .body .meta .pill { padding: 2px 9px; border-radius: 999px; border: 1px solid var(--border); color: var(--fg3); font-family: 'JetBrains Mono', monospace; font-size: 10.5px; }
.ksim-circuit-info .body .meta .pill.lang { color: var(--primary); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.ksim-circuit-info .x { background: transparent; border: 0; color: var(--fg3); cursor: pointer; font-size: 20px; line-height: 1; padding: 0 4px; }
.ksim-circuit-info .x:hover { color: var(--fg); }

/* ---- Code + serial ---- */
.dk-sim__code { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 14px; }
.ksim-editor { display: block; width: 100%; min-height: 380px; height: 46vh; resize: vertical; border: 0; outline: 0; padding: 12px 14px;
  background: var(--bg); color: var(--fg); font-family: 'JetBrains Mono', monospace; font-size: 12.5px; line-height: 1.55; tab-size: 2; white-space: pre; overflow: auto; }
.ksim-editor:focus { box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--primary) 50%, transparent); }
.dk-sim__console-head .dk-sim__tb { padding: 6px 10px; }
.ksim-console { height: 200px; overflow: auto; padding: 8px 12px; background: var(--bg); font-family: 'JetBrains Mono', monospace; font-size: 11.5px; line-height: 1.5; color: var(--fg2); }
.ksim-console .line { white-space: pre-wrap; word-break: break-word; }
.ksim-console .line .ts { color: var(--fg3); margin-right: 8px; opacity: .8; }
.ksim-console .line.sys { color: var(--fg3); }
.ksim-console .line.ok { color: var(--primary); }
.ksim-console .line.warn { color: #d97706; }
.ksim-console .line.err { color: #e11d48; }

/* ---- Component hint card (slides in when a part is dropped) ---- */
.ksim-hint { position: fixed; right: 18px; bottom: 18px; z-index: 900; width: min(380px, calc(100vw - 32px)); background: var(--bg2); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 24px 50px -24px var(--shadow); transform: translateY(16px); opacity: 0; pointer-events: none; transition: all .2s; color: var(--fg); }
.ksim-hint.show { transform: none; opacity: 1; pointer-events: auto; }
.ksim-hint .head { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border2); }
.ksim-hint .head .ic { width: 26px; height: 26px; border-radius: 6px; background: var(--primary); color: var(--primary-fg); display: flex; align-items: center; justify-content: center; font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 12px; }
.ksim-hint .head h4 { margin: 0; font-size: 14px; flex: 1; }
.ksim-hint .head .x { background: transparent; border: 0; color: var(--fg3); font-size: 20px; cursor: pointer; line-height: 1; }
.ksim-hint .body { padding: 10px 12px; max-height: 46vh; overflow: auto; }
.ksim-hint .desc { margin: 0 0 8px; font-size: 13px; color: var(--fg2); line-height: 1.5; }
.ksim-hint .warn { margin: 0 0 8px; padding: 8px 10px; border-radius: 6px; background: color-mix(in srgb, #f59e0b 12%, transparent); color: #b45309; font-size: 12px; }
.ksim-hint .ctxhint { margin: 0 0 8px; padding: 8px 10px; border-radius: 6px; background: color-mix(in srgb, var(--primary) 10%, transparent); color: var(--fg2); font-size: 12px; }
.ksim-hint .snippet { margin: 0; padding: 10px; border-radius: 6px; background: var(--bg); color: var(--fg); font-family: 'JetBrains Mono', monospace; font-size: 11.5px; line-height: 1.5; overflow: auto; white-space: pre; }
.ksim-hint .actions { display: flex; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--border2); }
.ksim-hint .actions button { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; padding: 7px 12px;
  border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--fg2); cursor: pointer; }
.ksim-hint .actions button.ok { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }

/* ---- Loading overlay ---- */
.ksim-loading { position: fixed; inset: 0; z-index: 950; background: color-mix(in srgb, var(--bg) 70%, transparent); backdrop-filter: blur(3px);
  display: none; align-items: center; justify-content: center; }
.ksim-loading.open { display: flex; }
.ksim-loading .card { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 22px 26px; min-width: 280px; color: var(--fg); }
.ksim-loading .spinner { width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--border); border-top-color: var(--primary); animation: ksimSpin .8s linear infinite; margin-bottom: 12px; }
@keyframes ksimSpin { to { transform: rotate(360deg); } }
.ksim-loading .title { font-weight: 700; font-size: 15px; }
.ksim-loading .sub { color: var(--fg3); font-size: 12.5px; margin-top: 2px; }
.ksim-loading .steps { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-direction: column; gap: 5px; font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: var(--fg3); }
.ksim-loading .steps li { display: flex; align-items: center; gap: 8px; }
.ksim-loading .steps .dot-ic { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.ksim-loading .steps li.active { color: var(--fg); } .ksim-loading .steps li.active .dot-ic { background: #f59e0b; }
.ksim-loading .steps li.done { color: var(--fg2); } .ksim-loading .steps li.done .dot-ic { background: var(--primary); }

/* ---- Toast ---- */
.ksim-toast { position: fixed; left: 18px; bottom: 18px; z-index: 1100; background: var(--bg2); color: var(--fg); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 14px; box-shadow: 0 20px 40px -20px var(--shadow); font-size: 13px; max-width: 340px; transform: translateY(16px); opacity: 0; transition: all .22s; pointer-events: none; }
.ksim-toast.show { opacity: 1; transform: none; }
.ksim-toast strong { display: block; margin-bottom: 2px; color: var(--primary); font-size: 12px; font-family: 'JetBrains Mono', monospace; letter-spacing: .04em; }
.ksim-toast.err strong { color: #e11d48; }

/* ---- Explain modal ---- */
.ksim-explain-modal { position: fixed; inset: 0; z-index: 940; background: color-mix(in srgb, var(--bg) 65%, transparent); display: none; align-items: center; justify-content: center; padding: 20px; }
.ksim-explain-modal.open { display: flex; }
.ksim-explain-card { width: min(680px, 100%); max-height: 84vh; overflow: auto; background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; color: var(--fg); }
.ksim-explain-card .head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--border2); }
.ksim-explain-card .head h3 { margin: 0; font-size: 16px; flex: 1; }
.ksim-explain-card .head .x { background: transparent; border: 0; font-size: 22px; color: var(--fg3); cursor: pointer; }
.ksim-explain-card .body { padding: 14px 16px; font-size: 14px; line-height: 1.6; color: var(--fg2); }
.ksim-explain-card .body code { font-family: 'JetBrains Mono', monospace; font-size: 12px; background: var(--bg); padding: 1px 5px; border-radius: 4px; color: var(--fg); }

/* ---- Code-help popup (errors) ---- */
.ksim-codehelp { position: fixed; right: 18px; bottom: 18px; z-index: 960; width: min(420px, calc(100vw - 32px)); background: var(--bg2); border: 1px solid #e11d48; border-radius: 10px;
  box-shadow: 0 24px 50px -24px var(--shadow); display: none; color: var(--fg); }
.ksim-codehelp.show { display: block; }
.ksim-codehelp .ch-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--border2); font-weight: 700; font-size: 14px; }
.ksim-codehelp .ch-head .x { margin-left: auto; background: transparent; border: 0; color: var(--fg3); font-size: 20px; cursor: pointer; }
.ksim-codehelp .ch-err { padding: 8px 12px; font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: #e11d48; word-break: break-word; }
.ksim-codehelp .ch-explain { padding: 0 12px 8px; font-size: 13px; color: var(--fg2); line-height: 1.5; }
.ksim-codehelp .ch-fix-title { padding: 6px 12px 4px; font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg3); }
.ksim-codehelp .ch-fix { margin: 0 12px 10px; padding: 10px; background: var(--bg); border-radius: 6px; font-family: 'JetBrains Mono', monospace; font-size: 11.5px; overflow: auto; white-space: pre; color: var(--fg); }
.ksim-codehelp .ch-actions { display: flex; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--border2); }
.ksim-codehelp .ch-actions button { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; padding: 7px 12px;
  border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--fg2); cursor: pointer; }
.ksim-codehelp .ch-actions button.primary { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }

/* ---- Locked page ---- */
.dk-sim-lock { max-width: 760px; margin: 0 auto; padding: 24px 0 40px; }
.dk-sim-lock__card { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 26px 28px; }
.dk-sim-lock__card h1 { margin: 6px 0 10px; font-size: 26px; letter-spacing: -.02em; }
.dk-sim-lock__card p { margin: 0 0 12px; color: var(--fg2); line-height: 1.6; font-size: 14.5px; }
.dk-sim-lock__btns { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.dk-sim-lock__list { margin: 12px 0 0; padding-left: 18px; color: var(--fg2); font-size: 13.5px; line-height: 1.6; }

/* ---- Responsive ---- */
@media (max-width: 1100px) {
  .dk-sim__grid { grid-template-columns: 200px minmax(0, 1fr); }
  .dk-sim__code { grid-column: 1 / -1; position: static; }
}
@media (max-width: 760px) {
  .dk-sim__head { grid-template-columns: 1fr; }
  .dk-sim__badges { justify-content: flex-start; }
  .dk-sim__grid { grid-template-columns: 1fr; }
  .dk-sim__parts { position: static; }
  .dk-sim__tiles { flex-direction: row; flex-wrap: wrap; max-height: none; }
  .dk-sim__tile { width: auto; flex: 1 1 140px; }
  .ksim-canvas-wrap { min-height: 60vw; }
  .ksim-editor { height: 40vh; min-height: 260px; }
}


/* ---- Learn pane ---- */
.dk-sim__learn-body { padding: 12px 14px 14px; }
.dk-sim__learn-title { margin: 0 0 4px; font-size: 16px; line-height: 1.25; letter-spacing: -.01em; color: var(--fg); }
.dk-sim__learn-goal { margin: 0 0 10px; font-size: 13px; line-height: 1.55; color: var(--fg2); }
.dk-sim__learn-sec { padding: 10px 0 2px; border-top: 1px solid var(--border2); }
.dk-sim__learn-label { font-family: 'JetBrains Mono', monospace; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg3); margin-bottom: 6px; }
.dk-sim__learn-hint { text-transform: none; letter-spacing: 0; font-family: inherit; font-size: 11px; color: var(--fg3); margin-left: 6px; }
.dk-sim__learn-list { margin: 0; padding-left: 18px; font-size: 12.5px; line-height: 1.5; color: var(--fg2); }
.dk-sim__learn-list li { margin: 0 0 4px; }
.dk-sim__learn-list li::marker { color: var(--primary); }
.dk-sim__learn-nums { display: flex; flex-wrap: wrap; gap: 6px; }
.dk-sim__num { display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 999px; background: var(--bg);
  color: var(--fg2); font-family: 'JetBrains Mono', monospace; font-size: 11px; cursor: pointer; transition: all .15s; }
.dk-sim__num:hover { border-color: var(--primary); color: var(--fg); }
.dk-sim__num .eq { color: var(--fg3); }
.dk-sim__num .v { color: var(--primary); font-weight: 700; }
.dk-sim__learn-checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 5px; }
.dk-sim__learn-checks li { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--fg2); line-height: 1.4; }
.dk-sim__learn-checks .box { width: 14px; height: 14px; border-radius: 4px; border: 1.5px solid var(--fg3); flex: 0 0 14px; transition: all .2s; position: relative; }
.dk-sim__learn-checks li.done { color: var(--fg); }
.dk-sim__learn-checks li.done .box { background: var(--primary); border-color: var(--primary); }
.dk-sim__learn-checks li.done .box::after { content: ''; position: absolute; left: 4px; top: 1px; width: 4px; height: 8px; border: solid var(--primary-fg); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.dk-sim__learn.is-complete .dk-sim__pane-head .pill { border-color: var(--primary); color: var(--primary); }
.dk-sim__learn-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 12px; }
.dk-sim__learn-nav .dk-sim__tb:disabled { opacity: .45; cursor: default; }

/* ---- Serial input ---- */
.dk-sim__serial-in { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-top: 1px solid var(--border2); background: var(--bg2); }
.dk-sim__serial-in .mono { color: var(--primary); font-size: 13px; }
.dk-sim__serial-in input { flex: 1; min-width: 0; padding: 7px 10px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--fg);
  font-family: 'JetBrains Mono', monospace; font-size: 12px; }
.dk-sim__serial-in input:focus { outline: none; border-color: var(--primary); }
.dk-sim__serial-hint { margin: 0; padding: 0 12px 10px; font-size: 11.5px; color: var(--fg3); background: var(--bg2); }
.dk-sim__serial-hint code { font-family: 'JetBrains Mono', monospace; color: var(--primary); }
.ksim-console .line.in { color: var(--primary, #22c55e); font-weight: 600; }