/* Voltbench — bench instrument chrome over a live 3D viewport.
   Palette: solder-mask teal, copper, silkscreen white, signal amber/red.
   Type: Unbounded (wordmark/headings) + Instrument Sans (UI, tabular figures). */

:root {
  --bg-deep: #0b2226;
  --panel: #123538;
  --panel-inset: #0d292c;
  --panel-edge: rgba(200, 127, 78, 0.30);
  --copper: #c87f4e;
  --copper-bright: #e8a06a;
  --silk: #e6efea;
  --silk-dim: #9db6b0;
  --amber: #ffb454;
  --signal-red: #ff5c49;
  --led-green: #6be39c;
  --shadow: rgba(4, 18, 20, 0.55);
  --font-display: "Unbounded", system-ui, sans-serif;
  --font-ui: "Instrument Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg-deep);
  color: var(--silk);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
}

#app {
  display: grid;
  grid-template-columns: 246px 1fr 272px;
  grid-template-rows: 64px 1fr;
  grid-template-areas:
    "top top top"
    "parts viewport bench";
  height: 100vh;
  gap: 10px;
  padding: 10px;
}

/* ---------- top bar ---------- */

#topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 0 18px;
  background: linear-gradient(180deg, #163e41 0%, #0f2e31 100%);
  border: 1px solid var(--panel-edge);
  border-bottom-color: rgba(200, 127, 78, 0.5);
  border-radius: 12px;
  box-shadow: 0 10px 24px var(--shadow);
}

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

.wordmark-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: 0.01em;
  color: var(--silk);
}

.wordmark-name::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 10px rgba(200, 127, 78, 0.8);
}

.wordmark-sub { font-size: 12.5px; color: var(--silk-dim); }

.voltage-block {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.voltage-block label { color: var(--silk-dim); }

.slider-wrap { position: relative; padding-bottom: 9px; }

#voltage {
  width: 190px;
  margin: 0;
  accent-color: var(--copper-bright);
  cursor: pointer;
}

.slider-ticks {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.slider-ticks i {
  width: 1px;
  height: 5px;
  background: rgba(200, 127, 78, 0.55);
}

#voltage-val {
  min-width: 56px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--amber);
}

.topbar-actions { display: flex; gap: 8px; }

#reset-btn, #menu-btn, .done-actions button, #sel-toolbar button {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  color: var(--silk);
  background: transparent;
  border: 1px solid var(--panel-edge);
  border-radius: 7px;
  padding: 8px 14px;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

#reset-btn:hover, #menu-btn:hover, .done-actions button:hover, #sel-toolbar button:hover {
  border-color: var(--copper);
  background: rgba(200, 127, 78, 0.12);
}

#menu-btn { border-color: rgba(200, 127, 78, 0.5); }

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

#parts-panel, #bench-panel {
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 10px 24px var(--shadow);
}

#parts-panel { grid-area: parts; }
#bench-panel { grid-area: bench; }

h2 {
  margin: 0 0 12px;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--silk);
}

.parts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.part-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
  padding: 10px 6px 9px;
  background: var(--panel-inset);
  border: 1px solid rgba(200, 127, 78, 0.18);
  border-radius: 8px;
  cursor: pointer;
  color: var(--silk);
  font-family: var(--font-ui);
  transition: border-color 120ms ease, transform 120ms ease, background 120ms ease;
}

.chip-thumb {
  width: 64px;
  height: 50px;
  object-fit: contain;
  border-radius: 5px;
  background: radial-gradient(circle at 50% 42%, rgba(200, 127, 78, 0.14), rgba(11, 34, 38, 0.65));
}

.part-chip:hover:not(:disabled) {
  border-color: var(--copper);
  background: #113134;
  transform: translateY(-2px);
}

.part-chip.armed {
  border-color: var(--copper-bright);
  background: rgba(200, 127, 78, 0.16);
  box-shadow: inset 0 0 0 1px rgba(232, 160, 106, 0.55);
}

.part-chip:disabled {
  opacity: 0.32;
  cursor: default;
  transform: none;
  background: var(--panel-inset);
  border-color: rgba(200, 127, 78, 0.12);
}

.chip-name { font-size: 12px; font-weight: 600; }
.chip-spec { font-size: 10.5px; color: var(--silk-dim); font-variant-numeric: tabular-nums; }

.panel-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--silk-dim);
  border-top: 1px solid rgba(200, 127, 78, 0.22);
  padding-top: 12px;
}

/* ---------- level card ---------- */

.level-card {
  background: var(--panel-inset);
  border: 1px solid rgba(200, 127, 78, 0.22);
  border-radius: 4px;
  padding: 12px 14px;
  margin-bottom: 14px;
}

.level-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.level-num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  color: var(--copper-bright);
}

.level-status { font-size: 11.5px; color: var(--silk-dim); }

.level-goal { margin: 0; font-size: 12.5px; color: var(--silk); }

/* ---------- readout ---------- */

.readout {
  background: var(--panel-inset);
  border: 1px solid rgba(200, 127, 78, 0.22);
  border-radius: 4px;
  padding: 14px;
  margin-bottom: 18px;
}

.readout-main {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(200, 127, 78, 0.22);
  margin-bottom: 10px;
}

#current-val {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.readout-unit { color: var(--silk-dim); font-size: 13px; }

.readout-rows { display: grid; gap: 6px; }

.readout-row {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}

.readout-row span:first-child { color: var(--silk-dim); }
.readout-row span:last-child { font-weight: 600; }

/* ---------- experiments ---------- */

.experiments { margin-bottom: 18px; }

#experiments {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

#experiments li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--silk-dim);
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(200, 127, 78, 0.14);
}

#experiments li:last-child { border-bottom: none; padding-bottom: 0; }

.exp-dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #23484b;
  border: 1px solid rgba(200, 127, 78, 0.35);
  transition: background 200ms ease, box-shadow 200ms ease;
}

#experiments li.done { color: var(--silk); }

#experiments li.done .exp-dot {
  background: var(--led-green);
  border-color: var(--led-green);
  box-shadow: 0 0 9px rgba(107, 227, 156, 0.75);
}

/* ---------- help ---------- */

.help-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
  font-size: 12.5px;
  color: var(--silk-dim);
}

.help-list li { display: flex; justify-content: space-between; align-items: center; gap: 8px; }

kbd {
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--silk);
  background: var(--panel-inset);
  border: 1px solid rgba(200, 127, 78, 0.3);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 7px;
}

/* ---------- viewport ---------- */

#viewport {
  grid-area: viewport;
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--panel-edge);
  box-shadow: 0 10px 24px var(--shadow);
  min-height: 320px;
}

#scene {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

#sel-toolbar {
  position: absolute;
  z-index: 12;
  transform: translate(-50%, -100%);
  display: flex;
  gap: 6px;
  padding: 5px;
  background: rgba(13, 41, 44, 0.92);
  border: 1px solid rgba(200, 127, 78, 0.45);
  border-radius: 9px;
  box-shadow: 0 10px 22px var(--shadow);
}

#sel-toolbar[hidden] { display: none; }

#sel-toolbar button {
  padding: 5px 11px;
  font-size: 12px;
  border-radius: 6px;
}

#delete-btn:hover { border-color: var(--signal-red); color: var(--signal-red); background: rgba(255, 92, 73, 0.1); }

#status-hint {
  position: absolute;
  left: 14px;
  bottom: 14px;
  max-width: min(520px, 80%);
  padding: 9px 14px;
  font-size: 12.5px;
  color: var(--silk);
  background: rgba(11, 34, 38, 0.82);
  border-left: 3px solid var(--copper);
  border-radius: 4px;
  pointer-events: none;
}

#toasts {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  gap: 8px;
  width: min(420px, 86%);
  pointer-events: none;
}

.toast {
  padding: 10px 14px;
  font-size: 13px;
  background: rgba(13, 41, 44, 0.94);
  border-left: 3px solid var(--copper);
  border-radius: 4px;
  box-shadow: 0 12px 26px var(--shadow);
  animation: toast-in 180ms ease-out;
}

.toast.warn { border-left-color: var(--signal-red); }
.toast.ok { border-left-color: var(--led-green); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- main menu ---------- */

#menu {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow-y: auto;
  background: rgba(9, 30, 33, 0.82);
  backdrop-filter: blur(7px);
}

#menu[hidden] { display: none; }

.menu-inner {
  width: min(680px, 100%);
  animation: menu-in 360ms ease-out;
}

@keyframes menu-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

.menu-title h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--silk);
}

.menu-title h1::after {
  content: "";
  display: inline-block;
  width: 13px;
  height: 13px;
  margin-left: 12px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 16px rgba(200, 127, 78, 0.9);
}

.menu-tagline { margin: 6px 0 0; font-size: 15px; color: var(--copper-bright); }

.menu-blurb {
  margin: 14px 0 26px;
  max-width: 56ch;
  font-size: 14px;
  color: var(--silk-dim);
}

.level-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(200, 127, 78, 0.28);
}

.level-row {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: baseline;
  column-gap: 14px;
  width: 100%;
  padding: 13px 10px;
  text-align: left;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(200, 127, 78, 0.28);
  cursor: pointer;
  color: var(--silk);
  font-family: var(--font-ui);
  transition: background 120ms ease, padding-left 120ms ease;
}

.level-row:hover:not(:disabled) { background: rgba(200, 127, 78, 0.10); padding-left: 16px; }

.level-row:disabled { cursor: default; opacity: 0.42; }

.level-row .lr-num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  color: var(--copper-bright);
}

.level-row .lr-name { font-size: 15px; font-weight: 600; }

.level-row .lr-goal {
  grid-column: 2;
  font-size: 12.5px;
  color: var(--silk-dim);
  margin-top: 2px;
}

.level-row .lr-dot {
  align-self: center;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #23484b;
  border: 1px solid rgba(200, 127, 78, 0.35);
}

.level-row.done .lr-dot {
  background: var(--led-green);
  border-color: var(--led-green);
  box-shadow: 0 0 9px rgba(107, 227, 156, 0.75);
}

.level-row.current .lr-dot {
  background: var(--copper-bright);
  border-color: var(--copper-bright);
  box-shadow: 0 0 9px rgba(232, 160, 106, 0.75);
}

.menu-foot { margin: 20px 0 0; font-size: 12px; color: var(--silk-dim); }

/* ---------- level complete card ---------- */

#level-done {
  position: absolute;
  z-index: 15;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(360px, 86%);
  padding: 22px;
  text-align: center;
  background: rgba(13, 41, 44, 0.96);
  border: 1px solid var(--copper);
  border-radius: 10px;
  box-shadow: 0 18px 44px var(--shadow);
}

#level-done[hidden] { display: none; }

#level-done h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  margin-bottom: 6px;
}

#done-name { margin: 0 0 18px; color: var(--silk-dim); font-size: 13.5px; }

.done-actions { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }

#next-btn { border-color: var(--copper); background: rgba(200, 127, 78, 0.16); }

/* ---------- focus & responsive ---------- */

button:focus-visible, input:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 2px;
}

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

@media (max-width: 980px) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: auto 54vh auto auto;
    grid-template-areas:
      "top"
      "viewport"
      "parts"
      "bench";
    height: auto;
    min-height: 100vh;
  }

  #topbar { flex-wrap: wrap; gap: 12px; padding: 12px 14px; height: auto; }
  .voltage-block { margin-left: 0; width: 100%; }
  .slider-wrap { flex: 1; }
  #voltage { width: 100%; }
  .parts-grid { grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); }
}