/* AMPierre: a purple circuit board around the work. Indigo solder-mask
 * shell with white silkscreen type, gold pads for whatever is active, copper
 * for traces, and calm lavender-grey work areas. Indigo and gold are the logo's
 * colours; everything else is tinted from the indigo. Square corners. */

:root {
  --indigo: #2f3061;      /* solder mask, logo ground */
  --indigo-deep: #23244a; /* mask in shadow: hover, pressed */
  --indigo-raised: #3d3e78; /* mask catching light: hover on the shell */
  --gold: #ffe66d;        /* ENIG pads, logo glyph: active and selected */
  --gold-soft: #fff4bf;   /* a pad's glow: selected rows on light ground */
  --copper: #b87333;      /* traces and rules (non-text) */
  --copper-deep: #8a5420; /* a pad that's been soldered: done steps */
  --silk: #ffffff;        /* silkscreen: type on the mask */
  --silk-muted: #c9cae6;  /* secondary silkscreen, 7.8:1 on indigo */

  --bg: #f3f3f8;          /* work ground, faintly lavender */
  --ink: #1f2033;
  --body-ink: #3a3c55;
  --muted: #565873;       /* 6.9:1 on white, 6.2:1 on --bg */
  --line: #dcdce8;
  --line-strong: #b9bacf;
  --control-line: #8b8ca6; /* form-control edges: 3.3:1 on white (WCAG 1.4.11) */
  --focus: var(--indigo);
  --card: #ffffff;
  --panel: #f0f0f7;
  --hover-soft: #e8e8f3;
  --accent: var(--indigo);
  --accent-hover: var(--indigo-deep);
  --accent-ink: var(--silk);
  --accent-soft: var(--gold-soft);
  --warn: #6e5a00;
  --warn-bg: var(--gold-soft);
  --warn-line: var(--gold);
  --error: #b3261e;

  /* The schematic canvas and the breadboard keep their own colours. */
  --area-accent: #a8601f;
  --area-ink: #1f1d1a;
  --area-muted: #6c675e;
  --area-line: #c6bfb1;
  --board-backdrop: #dedfeb; /* lavender-grey: the white board reads clearly on it */
}

* { box-sizing: border-box; border-radius: 0 !important; }
::selection { background: var(--gold); color: var(--indigo); }
input, textarea { caret-color: var(--indigo); }
html { scrollbar-color: var(--line-strong) var(--bg); }

html, body { height: 100%; }

body {
  margin: 0;
  padding-bottom: 76px; /* clear of the fixed tab bar */
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* header ----------------------------------------------------------------- */
.top {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 26px;
  padding: 18px 32px;
  background: var(--indigo);
  color: var(--silk);
  border-bottom: 3px solid var(--copper);
}
.brand { display: flex; align-items: center; gap: 12px; }
.mark {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  background: var(--accent); color: var(--gold);
  font: 700 23px/1 ui-sans-serif, system-ui, sans-serif;
}
h1, h2, h3, h4 { text-wrap: balance; }
h1 { font-size: 23px; margin: 0; letter-spacing: -0.015em; }
.tagline { margin: 1px 0 0; font-size: 13px; color: var(--silk-muted); }
.top > a.ghost { justify-self: end; }
.top a.ghost { background: transparent; color: var(--silk); border-color: rgba(255, 255, 255, 0.4); }
.top a.ghost:hover { background: var(--indigo-raised); border-color: var(--gold); }
.top :focus-visible { outline-color: var(--gold); }

main { max-width: 1480px; margin: 0 auto; padding: 18px 32px 40px; }
/* An element with a `display` rule of its own beats the browser's default
 * [hidden] rule, so anything hidden from JS has to say so explicitly. */
[hidden] { display: none !important; }
.pane[hidden] { display: none; }

/* cards ------------------------------------------------------------------ */
.card {
  background: var(--card);
  border: 1px solid var(--line-strong);
  padding: 20px 22px;
  margin: 0 0 18px;
}
.card h2 { font-size: 16px; margin: 0 0 10px; display: flex; align-items: center; gap: 9px; }
.step {
  display: grid; place-items: center;
  width: 20px; height: 20px;
  background: var(--accent); color: var(--gold); font-size: 11px; font-weight: 700;
}
h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin: 0 0 8px; }
.hint { color: var(--muted); font-size: 13px; }
.error { color: var(--error); font-size: 13px; }
.empty { color: var(--muted); font-size: 14px; padding: 40px 0; text-align: center; }

/* input ------------------------------------------------------------------ */
.field { display: block; margin: 14px 0 6px; }
.field span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
input[type="text"], input[type="number"], textarea, select {
  width: 100%; padding: 9px 11px; font: inherit; font-size: 14px;
  border: 1px solid var(--control-line); background: #fff; color: inherit;
}
input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }

/* One focus ring for everything else you can Tab to: indigo, outside the
 * element, so it reads on white, the lavender ground and the indigo buttons.
 * On the indigo shell it turns gold. */
:where(button, a, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}
.tab:focus-visible { outline-offset: -4px; outline-color: var(--gold); }
.seg-btn:focus-visible { outline-offset: -4px; outline-color: var(--gold); }
.seg-btn:not(.active):focus-visible { outline-color: var(--focus); }
textarea { font-family: ui-monospace, Menlo, monospace; font-size: 13px; margin-top: 8px; }
.alt { margin: 10px 0; }
.alt summary { cursor: pointer; font-size: 13px; color: var(--muted); }

.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.row.tight { margin-top: 0; }

button {
  font: inherit; font-size: 14px; cursor: pointer;
  padding: 8px 14px; border: 1px solid var(--line-strong); background: #fff; color: inherit;
}
button:hover { border-color: var(--indigo); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button:disabled { opacity: 0.45; cursor: default; }
button.link { border: 0; background: none; padding: 0; color: var(--accent); text-decoration: underline; font-size: 13px; }
button.chip { padding: 5px 10px; font-size: 13px; }
a.ghost { font-size: 13px; color: var(--muted); text-decoration: none; border: 1px solid var(--line-strong); padding: 6px 10px; background: #fff; }

/* part picker ------------------------------------------------------------ */
.question { border: 1px solid var(--line-strong); padding: 14px; margin: 12px 0; }
.question header { display: flex; align-items: baseline; gap: 10px; margin-bottom: 10px; }
.question .ref { font-weight: 700; }
.question .kind { color: var(--muted); font-size: 13px; }

/* choices on the left, the pinout of the chosen part on the right */
.q-body { display: grid; grid-template-columns: minmax(300px, 1fr) 340px; gap: 20px; align-items: start; }
.options { display: flex; flex-direction: column; gap: 7px; }
.option {
  display: flex; gap: 9px; align-items: flex-start;
  border: 1px solid var(--line); padding: 9px 11px; cursor: pointer; background: #fff;
}
.option:hover { border-color: var(--indigo); }
.option.sel { border-color: var(--accent); background: var(--accent-soft); }
.option input { margin-top: 3px; }
.option .label { font-size: 13.5px; font-weight: 600; display: block; }
.option .meta { font-size: 12px; color: var(--muted); display: block; margin-top: 2px; }

.filter { margin-bottom: 10px; }
.option.custom { display: block; }
.option.custom > label { display: flex; gap: 9px; align-items: flex-start; cursor: pointer; }
.custom-form { margin-top: 10px; border-top: 1px solid var(--line); padding-top: 10px; }
.cf-row { display: flex; gap: 10px; flex-wrap: wrap; }
.cf-row label { font-size: 12px; color: var(--muted); display: block; flex: 1 1 140px; }
.cf-row label.narrow { flex: 0 0 80px; }
.cf-row input, .cf-row select { margin-top: 4px; padding: 6px 8px; font-size: 13px; }
.cf-pins { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.cf-pin { display: flex; align-items: center; gap: 6px; font-size: 12.5px; }
.cf-pin span { font-family: ui-monospace, Menlo, monospace; }
.cf-pin input { width: 72px; padding: 5px 7px; font-size: 13px; }

.pinout-col { position: sticky; top: 14px; }
.pinout-col svg.pinout { display: block; width: 100%; height: auto; background: #fff; border: 1px solid var(--line-strong); padding: 6px; }
.pin-warn {
  font-size: 12.5px; color: var(--warn); background: var(--warn-bg);
  border: 1px solid var(--warn-line); padding: 8px 10px; margin: 10px 0 0;
}

/* board ------------------------------------------------------------------ */
.board-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; }
.board-head > * { min-width: 0; }
.board-head h2 { font-size: 16px; margin: 0; }
.board-scroll {
  overflow-x: auto; padding: 14px;
  background: var(--board-backdrop); border: 1px solid var(--line-strong);
}
.board-scroll svg { display: block; }
/* Board parts you Tab to get the same ring as everything else. */
#board [data-tip]:focus { outline: none; }
#board [data-tip]:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.legend { margin: 10px 0 0; max-width: 64ch; }
.panel.warn li { max-width: 64ch; }

.panels { display: grid; grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.4fr); gap: 22px; margin-top: 18px; }
.panel { border-top: 1px solid var(--line); padding-top: 14px; }
.panel.warn { background: var(--warn-bg); border: 1px solid var(--warn-line); padding: 12px 14px; margin-top: 16px; }
.panel.warn h3 { color: var(--warn); }
.panel.warn ul { margin: 0; padding-left: 18px; font-size: 13.5px; }
.panel.warn li.note { color: var(--muted); }

#bom { width: 100%; border-collapse: collapse; font-size: 13.5px; }
#bom td { padding: 5px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
#bom tr:hover, #bom tr:focus-visible { background: var(--hover-soft); }
#bom tr:focus-visible { outline-offset: -2px; }
#bom .ref { font-weight: 700; width: 58px; }
#bom .holes { font-family: ui-monospace, Menlo, monospace; color: var(--muted); font-size: 12px; }

#steps { margin: 0; padding-left: 20px; font-size: 13.5px; }
#steps li { margin-bottom: 4px; }
.step-btn {
  display: block; width: 100%; padding: 2px 4px; margin-left: -4px;
  border: 0; background: none; text-align: left; font-size: inherit; color: inherit;
}
.step-btn:hover { background: var(--hover-soft); }
.step-btn .hint { display: block; }

.seg { display: inline-flex; border: 1px solid var(--line-strong); }
.seg-btn { border: 0; border-right: 1px solid var(--line); font-size: 13px; padding: 7px 12px; color: var(--muted); }
.seg-btn:last-child { border-right: 0; }
.seg-btn.active { background: var(--accent); color: var(--accent-ink); font-weight: 600; box-shadow: inset 0 -3px 0 var(--gold); }
.seg-btn:hover:not(.active) { background: var(--hover-soft); color: var(--ink); }

/* timeline: a strip of solder mask under the board. The build is a copper
 * trace; each step is a pad: bare until reached, soldered once done, gold
 * where you are now. ------------------------------------------------------ */
.timeline {
  padding: 12px 14px 10px; margin-top: 14px;
  background: var(--indigo); color: var(--silk); border-top: 3px solid var(--copper);
}
.tl-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; }
.tl-head > * { min-width: 0; }
.tl-controls { display: flex; gap: 6px; flex-wrap: wrap; }
.timeline button {
  padding: 5px 10px; font-size: 13px;
  background: transparent; color: var(--silk); border-color: rgba(255, 255, 255, 0.4);
}
.timeline button:hover { background: var(--indigo-raised); border-color: var(--gold); }
.timeline :focus-visible { outline-color: var(--gold); }
.tl-right { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.tl-mode { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--silk-muted); cursor: pointer; }
.tl-mode input { accent-color: var(--gold); }
.tl-count { font-size: 12.5px; color: var(--silk-muted); font-variant-numeric: tabular-nums; }
#tl-range {
  -webkit-appearance: none; appearance: none; background: transparent;
  width: 100%; height: 20px; margin: 10px 0 4px; cursor: pointer;
}
#tl-range::-webkit-slider-runnable-track { height: 3px; background: var(--copper); }
#tl-range::-moz-range-track { height: 3px; background: var(--copper); }
#tl-range::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 14px; height: 14px; margin-top: -5.5px;
  background: var(--gold); border: 2px solid var(--indigo-deep); box-shadow: 0 0 0 1.5px var(--gold);
}
#tl-range::-moz-range-thumb {
  width: 14px; height: 14px; background: var(--gold); border: 2px solid var(--indigo-deep);
  box-shadow: 0 0 0 1.5px var(--gold);
}
#tl-range:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.ico { width: 14px; height: 14px; vertical-align: -2px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.ico .fill { fill: currentColor; stroke: none; }
.tl-now { min-height: 42px; }
.tl-text { margin: 0; font-size: 14.5px; font-weight: 600; }
.tl-detail { margin: 2px 0 0; font-size: 13px; color: var(--silk-muted); }
.tl-strip {
  position: relative; display: flex; gap: 10px; overflow-x: auto; padding: 10px 2px 6px;
  margin-top: 6px; border-top: 1px solid var(--indigo-raised);
  scrollbar-width: thin; scrollbar-color: var(--copper) transparent;
  /* the trace the pads sit on */
  background: linear-gradient(var(--copper), var(--copper)) 0 calc(50% + 2px) / 100% 2px no-repeat local;
}
.tl-strip .tl-chip {
  flex: 0 0 auto; display: flex; align-items: center; gap: 6px;
  padding: 5px 10px; font-size: 12.5px; white-space: nowrap;
  border: 1.5px solid var(--copper); background: var(--indigo-deep); color: var(--silk-muted);
}
.tl-strip .tl-chip:hover { border-color: var(--gold); color: var(--silk); background: var(--indigo-deep); }
.tl-chip .n { font-variant-numeric: tabular-nums; font-weight: 700; }
.tl-chip.wire .t { font-family: ui-monospace, Menlo, monospace; font-size: 11.5px; }
.tl-chip.lead .t { color: var(--silk); font-weight: 600; }
.tl-chip.lead.active .t, .tl-chip.lead.done .t { color: inherit; }
.tl-strip .tl-chip.done { background: var(--copper-deep); border-color: var(--copper-deep); color: var(--silk); }
.tl-strip .tl-chip.active { background: var(--gold); border-color: var(--gold); color: var(--indigo); font-weight: 600; }

/* tab bar ---------------------------------------------------------------- */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: flex; background: var(--indigo); border-top: 3px solid var(--copper);
}
.tab {
  flex: 1 1 0; display: flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 10px; font-size: 15px; font-weight: 600;
  border: 0; border-right: 1px solid var(--indigo-raised); background: var(--indigo); color: var(--silk-muted);
}
.tab:last-child { border-right: 0; }
.tab:hover:not(:disabled) { background: var(--indigo-raised); color: var(--silk); }
.tab.active { color: var(--silk); box-shadow: inset 0 -4px 0 var(--gold); }
.tab:disabled { opacity: 0.55; }
.tab-n {
  display: grid; place-items: center; width: 20px; height: 20px;
  background: transparent; color: var(--silk-muted); font-size: 11px; font-weight: 700;
  border: 1.5px solid var(--copper);
}
.tab.active .tab-n { background: var(--gold); color: var(--indigo); border-color: var(--gold); }
.tab-sub { font-size: 12px; font-weight: 400; color: var(--silk-muted); }

/* tooltip ---------------------------------------------------------------- */
.tooltip {
  position: fixed; z-index: 40; pointer-events: none;
  max-width: 340px; background: var(--indigo-deep); color: var(--silk);
  border-top: 2px solid var(--gold);
  padding: 10px 12px; font-size: 13px; line-height: 1.45;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}
.tooltip .t-title { font-weight: 700; margin-bottom: 2px; }
.tooltip .t-sub { color: var(--silk-muted); font-size: 12.5px; margin-bottom: 6px; }
.tooltip table { border-collapse: collapse; font-size: 12px; }
.tooltip td { padding: 1px 0; }
.tooltip td:first-child { color: var(--silk-muted); padding-right: 12px; white-space: nowrap; }
.tooltip .t-note { margin-top: 6px; color: var(--silk-muted); font-size: 12px; }
.tooltip .t-warn { margin-top: 6px; color: #ffb366; font-size: 12px; } /* amber: a state, not a selection */
.tooltip .t-pinout { margin: 6px 0; background: #fff; padding: 4px; }
.tooltip .t-pinout svg { display: block; width: 300px; height: auto; }

.busy {
  position: fixed; right: 18px; bottom: 90px; background: var(--accent); color: var(--silk);
  padding: 8px 13px; font-size: 13px; display: flex; align-items: center; gap: 8px; z-index: 35;
}
.busy em { font-style: normal; }
.busy span {
  width: 11px; height: 11px; border-radius: 50% !important;
  border: 2px solid rgba(255, 230, 109, 0.35); border-top-color: var(--gold);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .busy span { animation-duration: 2.4s; }
}

@media (max-width: 1040px) {
  .q-body { grid-template-columns: 1fr; }
  .pinout-col { position: static; max-width: 340px; }
}
@media (max-width: 900px) {
  .top { grid-template-columns: 1fr auto; gap: 14px; }
  .panels { grid-template-columns: 1fr; }
  main, .top { padding-left: 16px; padding-right: 16px; }
  .tab-sub { display: none; }
}

/* about page -------------------------------------------------------------- */
body.page-about { padding-bottom: 0; }
a.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }

.about { max-width: 1080px; padding-top: 34px; padding-bottom: 60px; }
.about section { margin-bottom: 46px; }
.about h3 { font-size: 19px; margin: 0 0 12px; letter-spacing: -0.01em; text-transform: none; color: var(--ink); }
.about p { max-width: 64ch; }

.about-story p { font-size: 15.5px; }
.about-story h4 { font-size: 16px; margin: 26px 0 8px; }

.learn-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.learn-card { background: #fff; border: 1px solid var(--line-strong); padding: 18px 20px; }
.learn-card h4 { font-size: 15px; margin: 0 0 8px; }
.learn-card p { font-size: 14px; color: var(--body-ink); margin: 0; }
.learn-wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 380px; gap: 26px; align-items: center; }
.learn-wide p { font-size: 14.5px; }

.primer { width: 100%; height: auto; display: block; }
.primer .pr-board { fill: #fdfdfb; stroke: var(--area-line); }
/* on the group, so the <use> copies of a row inherit it too */
.primer .pr-holes { fill: #eceae3; stroke: #c3bfb4; stroke-width: 0.8; }
.primer .pr-rail { stroke-width: 2; }
.primer .pr-rail.pos { stroke: #d2444a; }
.primer .pr-rail.neg { stroke: #3a62c0; }
.primer .pr-channel { fill: #f0efea; stroke: #d8d5cc; }
.primer .pr-hl { fill: rgba(180, 85, 45, 0.16); stroke: var(--area-accent); stroke-width: 2; }
.primer .pr-hl.alt { fill: rgba(31, 29, 26, 0.08); stroke: var(--area-ink); }
.primer .pr-hl-rail { fill: rgba(210, 68, 74, 0.1); stroke: #d2444a; stroke-width: 1.5; stroke-dasharray: 4 3; }
.primer .pr-lead { stroke: var(--area-muted); stroke-width: 1; }
.primer .pr-note { font: 600 11.5px ui-sans-serif, system-ui, sans-serif; fill: var(--area-ink); }

.about-how { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; }
.tips { margin: 0; padding-left: 20px; }
.tips li { margin-bottom: 10px; font-size: 14.5px; }
.about-how p { font-size: 14.5px; }

.credit {
  display: flex; gap: 22px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line-strong);
  padding: 24px 26px;
}
.credit-mark {
  flex: 0 0 auto; width: 58px; height: 58px; display: grid; place-items: center;
  background: var(--accent); color: var(--gold); font: 700 20px/1 ui-sans-serif, system-ui, sans-serif;
}
.credit-body h3 { font-size: 22px; margin: 0 0 8px; }
.credit-body p { margin: 0 0 14px; font-size: 14.5px; color: var(--body-ink); }
a.primary-link {
  display: inline-block; background: var(--accent); color: var(--silk); text-decoration: none;
  font-weight: 600; font-size: 14px; padding: 9px 16px;
}
a.primary-link:hover { background: var(--accent-hover); }

.about-foot { border-top: 1px solid var(--line-strong); padding-top: 16px; font-size: 13px; color: var(--muted); }
.about-foot p { margin: 4px 0; }
.about-foot a { color: var(--muted); }

@media (max-width: 860px) {
  .learn-grid { grid-template-columns: 1fr; }
  .learn-wide { grid-template-columns: 1fr; }
  .about-how { grid-template-columns: 1fr; gap: 10px; }
  .credit { flex-direction: column; }
}

/* featured builds --------------------------------------------------------- */
.chip.featured { border-color: var(--copper); color: var(--ink); font-weight: 600; }
.ex-badge {
  display: inline-block; margin-right: 7px; padding: 1px 6px;
  background: transparent; color: var(--copper-deep); box-shadow: inset 0 0 0 1px var(--copper);
  font: 700 11px/1.5 ui-sans-serif, system-ui, sans-serif; letter-spacing: 0.02em;
  text-transform: uppercase; vertical-align: 1px;
}
.project-card {
  display: flex; gap: 18px; align-items: flex-start;
  margin: 0 0 14px; padding: 16px 18px;
  background: var(--panel); border-top: 2px solid var(--copper);
}
.project-card .credit-mark { flex: 0 0 auto; }
.project-body h3 {
  margin: 0 0 6px; font-size: 18px; letter-spacing: -0.01em;
  text-transform: none; color: var(--ink);
}
.project-body p { margin: 0 0 10px; font-size: 14px; color: var(--body-ink); max-width: 60ch; }
.project-facts { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 10px; padding: 0; }
.project-facts li {
  padding: 2px 9px; font-size: 12.5px; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line);
}
@media (max-width: 720px) {
  .project-card { flex-direction: column; gap: 10px; }
}

.featured { border-top: 3px solid var(--copper); padding-top: 26px; }
.featured h3 { font-size: 24px; }
.featured .project-facts { margin: 4px 0 16px; }
.featured-board {
  display: block; margin: 0 0 16px; padding: 10px;
  background: #fff; border: 1px solid var(--line-strong); overflow: hidden;
}
.featured-board svg { display: block; width: 100%; height: auto; }
.featured-board:hover { border-color: var(--indigo); }

/* schematic editor --------------------------------------------------------- */
.input-bar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 0 0 14px; }
#input-error { margin: -4px 0 14px; }
.input-mode { background: #fff; }
.examples-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
#examples { display: inline-flex; gap: 6px; flex-wrap: wrap; }
#spice { min-height: 220px; }
.input-mode .seg-btn { font-size: 14px; padding: 9px 16px; }

.sch-head { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin: 6px 0 10px; }
.sch-title { max-width: 340px; font-weight: 600; }
.sch-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.sch-actions button { padding: 6px 11px; font-size: 13px; }

.sch-body { display: grid; grid-template-columns: 190px minmax(0, 1fr) 240px; gap: 10px; align-items: stretch; }
.sch-tools {
  display: flex; flex-direction: column; gap: 2px; max-height: 600px; overflow-y: auto;
  border: 1px solid var(--line-strong); background: var(--panel); padding: 4px;
}
.sch-tool {
  display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 8px;
  padding: 4px 7px; font-size: 12.5px; text-align: left; border: 1px solid transparent; background: none;
}
.sch-tool:hover { background: var(--hover-soft); border-color: var(--line); }
.sch-tool.active { background: var(--accent-soft); border-color: var(--accent); }
.sch-tool svg { width: 22px; height: 22px; fill: none; stroke: var(--ink); stroke-width: 1.3; vector-effect: non-scaling-stroke; }
.sch-tool svg * { vector-effect: non-scaling-stroke; }
.sch-tool svg .fill { fill: var(--ink); }
.sch-tool svg text { fill: var(--ink); stroke: none; font-family: ui-sans-serif, system-ui, sans-serif; }
.sch-tool kbd {
  font: 600 10.5px ui-monospace, Menlo, monospace; color: var(--muted);
  border: 1px solid var(--line); padding: 0 4px; background: #fff;
}
.sch-sep { border-top: 1px solid var(--line); margin: 3px 2px; }

.sch-canvas-wrap { position: relative; min-width: 0; }
.sch-canvas {
  display: block; width: 100%; height: 600px; background: var(--card);
  border: 1px solid var(--line-strong); cursor: default; user-select: none;
  touch-action: none; /* drags draw and move parts instead of scrolling the page */
}
.sch-canvas:focus { outline: none; }
.sch-canvas:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }
.sch-canvas[data-tool="wire"], .sch-canvas[data-tool="place"] { cursor: crosshair; }
.sch-canvas[data-tool="delete"] { cursor: not-allowed; }
.sch-status {
  position: absolute; left: 1px; right: 1px; bottom: 1px; padding: 5px 10px;
  font-size: 12.5px; color: var(--muted); background: rgba(255, 255, 255, 0.92);
  border-top: 1px solid var(--line); pointer-events: none;
}
.sch-griddot { fill: #c3c4d8; }
.sch-part path, .sch-part circle { fill: none; stroke: #1f3c88; stroke-width: 1.6; vector-effect: non-scaling-stroke; stroke-linejoin: round; stroke-linecap: round; }
.sch-part path.fill { fill: #1f3c88; }
.sch-part .hit { fill: transparent; stroke: none; }
.sch-part:hover .hit { fill: rgba(180, 85, 45, 0.06); }
.sch-part.sel path, .sch-part.sel circle { stroke: var(--area-accent); }
.sch-part.sel path.fill { fill: var(--area-accent); }
.sch-part.sel .hit { fill: rgba(180, 85, 45, 0.1); }
.sch-part.ghost { opacity: 0.45; pointer-events: none; }
.sch-ref { font: 700 12px ui-sans-serif, system-ui, sans-serif; fill: var(--area-ink); }
.sch-val { font: 12px ui-sans-serif, system-ui, sans-serif; fill: var(--area-muted); }
.sch-net { font: 700 12.5px ui-monospace, Menlo, monospace; fill: #8a2a5a; }
.sch-wire { stroke: #2e7d32; stroke-width: 2; stroke-linecap: round; fill: none; }
.sch-wire.sel { stroke: var(--area-accent); stroke-width: 3; }
.sch-wire.ghost { stroke-dasharray: 5 4; opacity: 0.8; pointer-events: none; }
.sch-dot { fill: #2e7d32; }
.sch-loose { fill: #fff; stroke: #c62828; stroke-width: 1.4; }
.sch-cross { stroke: var(--area-accent); stroke-width: 1; pointer-events: none; }

.sch-props { border: 1px solid var(--line-strong); padding: 12px; background: var(--panel); font-size: 13px; overflow-y: auto; max-height: 600px; }
.sch-props h3 { margin-bottom: 10px; }
.sch-field { display: block; font-size: 12px; color: var(--muted); margin-bottom: 9px; }
.sch-field input { margin-top: 3px; padding: 6px 8px; font-size: 13.5px; }
.sch-check { display: flex; gap: 7px; align-items: flex-start; font-size: 12.5px; margin-bottom: 10px; }
.sch-check input { accent-color: var(--accent); margin-top: 3px; }
.sch-pbtns { display: flex; gap: 5px; flex-wrap: wrap; margin: 4px 0 12px; }
.sch-pbtns button { padding: 4px 9px; font-size: 12.5px; }
.sch-pins-h { margin-top: 6px; }
.sch-pins { border-collapse: collapse; font-size: 12.5px; width: 100%; }
.sch-pins td { padding: 2px 4px; border-bottom: 1px solid var(--line); font-family: ui-monospace, Menlo, monospace; }
.sch-pins td:first-child { color: var(--muted); width: 44px; }
.sch-keys { display: grid; grid-template-columns: auto 1fr; gap: 3px 10px; margin: 0 0 12px; font-size: 12.5px; }
.sch-keys dt { font: 600 11.5px ui-monospace, Menlo, monospace; white-space: nowrap; }
.sch-keys dd { margin: 0; color: var(--muted); }

.sch-foot { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; margin-top: 10px; flex-wrap: wrap; }
.sch-problems { margin: 0; padding-left: 18px; font-size: 13px; color: var(--warn); flex: 1 1 300px; }
.sch-problems:focus { outline: none; }
.sch-problems li.note { color: var(--muted); list-style: none; margin-left: -18px; }
.sch-problems li.bad { color: var(--error); font-weight: 600; }
#sch-error { margin: 0 0 8px; }
.sch-foot .row { margin-left: auto; }

@media (max-width: 1100px) {
  .sch-body { grid-template-columns: 170px minmax(0, 1fr); }
  .sch-props { grid-column: 1 / -1; max-height: none; }
}
@media (max-width: 700px) {
  .sch-body { grid-template-columns: 1fr; }
  .sch-tools { flex-direction: row; flex-wrap: wrap; max-height: none; }
  .sch-tool { grid-template-columns: 22px auto; }
  .sch-tool span, .sch-tool kbd { display: none; }
  .sch-canvas { height: 420px; }
}