/* ============================================================
   EE Toolbox — Deep-Space Theme
   Matches Beckify.com's nebula-violet design system
   ============================================================ */

/* Webfonts are loaded from index.html, not with an @import.
   An @import is discovered only after this file has been fetched and parsed,
   it blocks rendering, and — because a pending stylesheet also blocks the
   classic <script> tags behind it — a slow or unreachable fonts.googleapis.com
   stalls the whole toolbox rather than just its typography. The <link> in
   index.html loads the same stylesheet without blocking, so an offline or
   blocked load simply falls back to the local monospace stack. */

/* ── Design tokens ── */
:root {
  --violet:       #8b7bff;
  --violet-soft:  rgba(139,123,255,0.14);
  --violet-ring:  rgba(139,123,255,0.35);
  --violet-dim:   #6b5bdf;
  --blue:         #4f8bff;
  --blue-soft:    rgba(79,139,255,0.12);

  --fg:           #eef0fa;
  --fg-muted:     #9497b8;
  --fg-dim:       #5a5c76;

  --bg:           #05060f;
  --bg-card:      rgba(255,255,255,0.032);
  --bg-input:     rgba(255,255,255,0.04);
  --bg-sidebar:   #03040a;
  --bg-header:    rgba(3,4,10,0.92);
  --bg-active:    rgba(139,123,255,0.08);

  --border:       rgba(255,255,255,0.08);
  --border-hover: rgba(139,123,255,0.45);

  --red:          #ef4444;
  --red-dim:      rgba(239,68,68,0.15);
  --green-ok:     #4ade80;
  --yellow:       #f5c451;

  --radius:       10px;
  --sidebar-w:    248px;

  --shadow-card:  0 1px 2px rgba(0,0,0,0.4), 0 8px 28px -8px rgba(0,0,0,0.6);
  --shadow-hover: 0 4px 20px rgba(0,0,0,0.45), 0 0 0 1px rgba(139,123,255,0.25), 0 24px 56px -12px rgba(139,123,255,0.2);

  --font-main: 'IBM Plex Mono', 'ui-monospace', 'Cascadia Code', monospace;
  --font-display: 'Exo 2', 'Sora', system-ui, sans-serif;
  --font-ui: 'Sora', system-ui, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size-adjust: from-font;
  text-rendering: optimizeLegibility;
  letter-spacing: 0.01em;
  line-height: 1.55;
}

/* Aperiodic Penrose P3 tiling, shared with the main site (see
 * scripts/generate-penrose.mjs). Masked and held at low opacity so it reads as
 * paper texture rather than a graphic. */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.075;
  background-image: url('/penrose.svg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 38%, #000 0%, transparent 76%);
  mask-image: radial-gradient(ellipse 85% 75% at 50% 38%, #000 0%, transparent 76%);
}

/* Subtle nebula glow fixed in background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 15% 20%, rgba(139,123,255,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 75%, rgba(79,139,255,0.05) 0%, transparent 70%);
}

/* ── Header ── */
header {
  background: var(--bg-header);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--fg);
  display: flex;
  align-items: stretch;
  position: sticky;
  top: 0;
  z-index: 200;
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  width: 100%;
}

header h1 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--fg);
  line-height: 1;
}

header .subtitle {
  font-size: 0.72rem;
  color: var(--fg-muted);
  font-family: var(--font-main);
  margin-top: 2px;
  letter-spacing: 0.03em;
}

.header-status {
  margin-left: auto;
  font-family: var(--font-main);
  font-size: 0.68rem;
  color: var(--fg-dim);
  text-align: right;
  flex-shrink: 0;
  letter-spacing: 0.03em;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}
.header-readout { text-align: right; }
.header-status .status-ok { color: var(--green-ok); }
.header-actions { display: flex; gap: 8px; justify-content: flex-end; }

.header-btn {
  padding: 6px 14px;
  background: var(--bg-card);
  color: var(--fg-muted);
  border: 1px solid var(--border);
  font-family: var(--font-main);
  font-size: 0.78rem;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.15s ease;
  letter-spacing: 0.04em;
}
.header-btn:hover {
  background: var(--violet-soft);
  color: var(--violet);
  border-color: var(--violet-ring);
}

.header-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.15s ease;
  margin-right: auto;
}
.header-logo:hover {
  background: var(--violet-soft);
  color: var(--violet);
  border-color: var(--violet-ring);
}

/* ── Layout ── */
.layout {
  display: flex;
  min-height: calc(100vh - 58px);
  position: relative;
  z-index: 1;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  color: var(--fg-muted);
  position: sticky;
  top: 58px;
  height: calc(100vh - 58px);
  overflow-y: auto;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  scrollbar-width: thin;
  scrollbar-color: rgba(139,123,255,0.2) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb {
  background: rgba(139,123,255,0.25);
  border-radius: 4px;
}

.sidebar-search {
  padding: 12px 12px 10px;
  border-bottom: 1px solid var(--border);
}
.sidebar-search label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
  margin-bottom: 6px;
  display: block;
}

.sidebar-section { padding: 10px 0 4px; }
.sidebar-section-title {
  font-family: var(--font-main);
  font-size: 0.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-dim);
  padding: 6px 14px 4px;
  margin-bottom: 2px;
}

.nav-btn {
  display: block;
  width: 100%;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  text-align: left;
  padding: 7px 14px 7px 12px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--fg-muted);
  transition: all 0.12s ease;
  line-height: 1.3;
}
.nav-btn:hover {
  background: rgba(255,255,255,0.03);
  color: var(--fg);
  border-left-color: rgba(139,123,255,0.3);
}
.nav-btn.active {
  background: var(--bg-active);
  color: var(--violet);
  border-left-color: var(--violet);
  font-weight: 500;
}
a.nav-ext {
  display: block;
  width: 100%;
  box-sizing: border-box;
  border-left: 2px solid transparent;
  text-align: left;
  padding: 7px 14px 7px 12px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--fg-muted);
  text-decoration: none;
  line-height: 1.3;
}
a.nav-ext:hover {
  background: rgba(255,255,255,0.03);
  color: var(--fg);
  border-left-color: rgba(139,123,255,0.3);
}

.family-tabs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin: 0 0 1.1rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(139, 123, 255, 0.28);
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(139, 123, 255, 0.08), rgba(79, 139, 255, 0.04));
}
.family-tabs-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.family-tab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.family-tab {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: var(--fg-muted);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}
.family-tab:hover { color: var(--fg); border-color: rgba(139, 123, 255, 0.4); }
.family-tab.active {
  background: var(--violet-soft);
  color: var(--violet);
  border-color: var(--violet-ring);
  font-weight: 600;
}

/* ── Main content ── */
.main {
  flex: 1;
  padding: 24px 28px 56px;
  min-width: 0;
}

/* ── Sections ── */
.section { display: none; }
.section.active { display: block; }
/* The header is sticky and overlays the content, so a hash jump would otherwise
   park a tool's title underneath it. scroll-margin-top offsets the landing
   point for both in-app navigation and direct deep links. */
.section { scroll-margin-top: calc(var(--header-h, 58px) + 10px); }

.section-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
  margin-bottom: 24px;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-header p {
  color: var(--fg-muted);
  font-size: 0.82rem;
  margin-top: 5px;
  letter-spacing: 0.01em;
}
.section-header a,
.note a {
  color: var(--violet);
}

/* ── Card grid ── */
/* min() keeps the track from ever being wider than the container, so a narrow
   viewport collapses to one column instead of overflowing horizontally. The
   mobile media query below resets .card-grid, but a more specific modifier
   like .two-col would otherwise win and reintroduce the overflow. */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: 16px;
}
.card-grid.wide { grid-template-columns: 1fr; }
.card-grid.two-col { grid-template-columns: repeat(auto-fill, minmax(min(420px, 100%), 1fr)); }

/* ── Card ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover {
  box-shadow: var(--shadow-hover);
  border-color: rgba(139,123,255,0.2);
}

.card-title {
  padding: 10px 16px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--fg);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--violet);
  flex-shrink: 0;
  box-shadow: 0 0 6px var(--violet);
}

.card-body { padding: 16px; }

/* ── Formula display ── */
.formula-box {
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-family: var(--font-main);
  font-size: 0.8rem;
  color: var(--fg-muted);
  line-height: 1.9;
}
.formula-box strong { color: var(--fg); }

/* ── Inputs ── */
.input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}
.input-group.single { grid-template-columns: 1fr; }
.input-group.triple { grid-template-columns: 1fr 1fr 1fr; }
.input-group.quad { grid-template-columns: repeat(4, minmax(0, 1fr)); }

label {
  font-family: var(--font-main);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--fg-muted);
  display: block;
  margin-bottom: 5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

input[type="number"],
input[type="text"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.88rem;
  background: var(--bg-input);
  color: var(--fg);
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
  -webkit-appearance: none;
}
input[type="number"]:focus,
input[type="text"]:focus,
input[type="search"]:focus,
select:focus,
textarea:focus {
  border-color: var(--violet);
  outline: none;
  box-shadow: 0 0 0 3px var(--violet-ring);
}
input::placeholder { color: var(--fg-dim); }

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239497b8'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}
select option { background: #0d0e1f; color: var(--fg); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 22px;
  background: var(--violet-soft);
  color: var(--violet);
  border: 1px solid rgba(139,123,255,0.35);
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
  margin-top: 4px;
}
.btn:hover {
  background: rgba(139,123,255,0.25);
  border-color: var(--violet);
  color: #fff;
  box-shadow: 0 0 0 1px var(--violet-ring), 0 4px 16px rgba(139,123,255,0.2);
}
.btn-accent {
  background: var(--blue-soft);
  color: var(--blue);
  border-color: rgba(79,139,255,0.35);
}
.btn-accent:hover {
  background: rgba(79,139,255,0.25);
  border-color: var(--blue);
  color: #fff;
}
.btn-sm { padding: 5px 14px; font-size: 0.8rem; }

/* ── Results ── */
.result {
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet);
  border-radius: 8px;
  padding: 12px 16px;
  margin-top: 14px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  display: none;
}
.result.show { display: block; }
.result .res-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 5px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  gap: 12px;
}
.result .res-row:last-child { border-bottom: none; }
.result .res-label {
  color: var(--fg-muted);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.result .res-val {
  font-family: var(--font-main);
  font-size: 0.88rem;
  color: var(--fg);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-align: right;
}
.result.error {
  border-left-color: var(--red);
  background: var(--red-dim);
  color: var(--red);
}
.result.error::before { content: '⚠ '; }

/* ── Dynamic rows ── */
.dynamic-inputs { margin-bottom: 12px; }
.dynamic-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.dynamic-row input { flex: 1; }
.btn-remove {
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
  transition: all 0.12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-remove:hover {
  background: var(--red-dim);
  color: var(--red);
  border-color: rgba(239,68,68,0.4);
}

/* ── Reference Tables ── */
.ref-table-wrap { overflow-x: auto; margin-top: 10px; }
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-main);
  font-size: 0.76rem;
}
.ref-table th {
  background: rgba(139,123,255,0.1);
  color: var(--violet);
  padding: 8px 12px;
  text-align: center;
  white-space: nowrap;
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  font-weight: 600;
}
.ref-table td {
  padding: 5px 12px;
  border: 1px solid var(--border);
  text-align: center;
  color: var(--fg-muted);
}
.ref-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
.ref-table tr:hover td {
  background: var(--violet-soft);
  color: var(--fg);
}
.ref-table .highlight {
  background: rgba(139,123,255,0.15) !important;
  color: var(--violet) !important;
  font-weight: 600;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.tab-btn {
  padding: 7px 18px;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--fg-muted);
  transition: all 0.15s ease;
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--fg); background: rgba(255,255,255,0.04); }
.tab-btn.active {
  background: var(--bg-card);
  color: var(--violet);
  border-color: var(--border);
  border-bottom-color: var(--bg);
  position: relative;
}
.tab-pane { display: none; }
.tab-pane.active { display: block; }
.feynman-formula { color: var(--violet); font-family: var(--font-display); font-size: 1.12rem; line-height: 1.7; min-height: 2rem; }
.tex-frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; line-height: 1.05; margin: 0 0.12em; }
.tex-frac > span:first-child { border-bottom: 1px solid currentColor; padding: 0 0.18em 0.1em; }
.tex-frac > span:last-child { padding: 0.1em 0.18em 0; }
.tex-text { font-family: var(--font-main); font-size: 0.85em; }
.tex-space { display: inline-block; width: 1.2em; }
.tex-thin-space { display: inline-block; width: 0.25em; }

/* ── Notes ── */
.note {
  font-family: var(--font-main);
  font-size: 0.74rem;
  color: var(--fg-muted);
  background: rgba(79,139,255,0.06);
  border: 1px solid rgba(79,139,255,0.2);
  border-radius: 7px;
  padding: 7px 12px;
  margin-top: 10px;
  letter-spacing: 0.01em;
  line-height: 1.5;
}
.note::before { content: 'ℹ '; color: var(--blue); }

.clr-diagram {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.32);
}
.clr-diag-meter {
  fill: rgba(79, 139, 255, 0.14);
  stroke: rgba(79, 139, 255, 0.85);
  stroke-width: 2;
}
.clr-diag-wire {
  stroke: rgba(74, 222, 128, 0.95);
  stroke-width: 4;
  stroke-linecap: round;
}
.clr-diag-jumper {
  stroke: rgba(251, 146, 60, 0.95);
  stroke-width: 4;
  stroke-linecap: round;
}
.clr-diag-probe {
  fill: rgba(139, 123, 255, 0.85);
}
.clr-diag-label {
  fill: var(--fg);
  font-size: 15px;
  font-weight: 700;
}
.clr-diag-sub,
.clr-diag-tag,
.clr-diag-note {
  fill: var(--fg-muted);
  font-size: 12px;
}
.eb-gear-drive,
.eb-gear-driven {
  fill: rgba(16, 185, 129, 0.12);
  stroke: rgba(16, 185, 129, 0.95);
  stroke-width: 3;
}

/* ── Expandable Info Panels ── */
.section-info {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0,0,0,0.2);
}
.section-info summary {
  font-family: var(--font-main);
  font-size: 0.76rem;
  color: var(--fg-muted);
  padding: 7px 12px;
  cursor: pointer;
  letter-spacing: 0.03em;
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.12s;
}
.section-info summary::-webkit-details-marker { display: none; }
.section-info summary::before {
  content: '▸';
  color: var(--fg-dim);
  font-size: 0.7rem;
  transition: transform 0.15s;
}
.section-info[open] summary::before {
  content: '▾';
  color: var(--violet);
}
.section-info summary:hover { color: var(--fg); }
.section-info-body {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--border);
  font-family: var(--font-main);
  font-size: 0.77rem;
  color: var(--fg-muted);
  line-height: 1.75;
  letter-spacing: 0.01em;
}
.section-info-body strong { color: var(--fg); }
.section-info-body ul { margin: 4px 0 4px 18px; padding: 0; }
.section-info-body li::marker { color: var(--violet); }

/* ── Copy button ── */
.result-copy-row {
  display: flex;
  justify-content: flex-end;
  padding-top: 8px;
  border-top: 1px solid rgba(255,255,255,0.05);
  margin-top: 6px;
}
.btn-copy {
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  font-family: var(--font-main);
  font-size: 0.7rem;
  padding: 3px 10px;
  cursor: pointer;
  border-radius: 5px;
  letter-spacing: 0.05em;
  transition: all 0.12s ease;
}
.btn-copy:hover {
  background: var(--violet-soft);
  color: var(--violet);
  border-color: var(--violet-ring);
}

/* ── Sidebar search input override ── */
#nav-search {
  font-size: 0.8rem;
  padding: 6px 10px;
}

/* ── Sidebar home button ── */
.sidebar-home-btn-wrap {
  padding: 10px 10px 6px;
  border-bottom: 1px solid var(--border);
}
.sidebar-home-btn-wrap .home-btn {
  width: 100%;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(139,123,255,0.07);
  color: var(--violet);
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.sidebar-home-btn-wrap .home-btn:hover,
.sidebar-home-btn-wrap .home-btn.active {
  background: rgba(139,123,255,0.18);
  border-color: var(--violet-ring);
  color: #fff;
}
.sidebar-home-btn-wrap .home-btn:focus-visible {
  outline: 3px solid #f5c451;
  outline-offset: 3px;
}
.sidebar-search label {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
kbd {
  display: inline-block;
  padding: 1px 5px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-main);
  font-size: 0.68rem;
  color: var(--fg-dim);
  line-height: 1.4;
}

/* ════════════════════════════════════════
   HOME DASHBOARD
   ════════════════════════════════════════ */
.home-header {
  margin-bottom: 28px;
}
.home-title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.5vw, 1.9rem);
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: 8px;
  font-size-adjust: from-font;
}
.home-subtitle {
  color: var(--fg-muted);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  line-height: 1.65;
  letter-spacing: 0.01em;
  max-width: 560px;
  font-size-adjust: from-font;
}
.home-subtitle kbd {
  margin: 0 2px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.home-cat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 2px solid var(--cat-color, var(--violet));
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}
.home-cat-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.4), 0 0 0 1px rgba(139,123,255,0.15);
  transform: translateY(-2px);
}

.home-cat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px 10px;
  background: rgba(255,255,255,0.025);
  border-bottom: 1px solid var(--border);
}
.home-cat-icon {
  display: inline-flex;
  width: 1.15rem;
  height: 1.15rem;
  line-height: 1;
  flex-shrink: 0;
}
.beckify-icon { display: inline-flex; width: 1.05em; height: 1.05em; vertical-align: -0.12em; color: currentColor; flex: 0 0 auto; }
.beckify-icon svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.home-cat-icon .beckify-icon { width: 100%; height: 100%; }
.home-cat-name {
  font-family: var(--font-display);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.01em;
}

.home-tool-list {
  list-style: none;
  padding: 8px 0;
  margin: 0;
}
.home-tool-list li {
  padding: 0;
}
.home-tool-link {
  display: block;
  padding: 6px 14px;
  font-family: var(--font-main);
  font-size: 0.8rem;
  color: var(--fg-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.1s ease;
  line-height: 1.3;
}
.home-tool-link:hover {
  color: var(--cat-color, var(--violet));
  background: rgba(255,255,255,0.03);
  border-left-color: var(--cat-color, var(--violet));
}

/* Games card slight visual distinction */
.home-cat-games .home-tool-link:hover {
  color: var(--cat-color, var(--violet));
}

@media (max-width: 900px) {
  .home-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
  }
}
@media (max-width: 600px) {
  .home-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .home-title { font-size: 1.4rem; }
}

/* ── Mobile sidebar toggle ── */
.sidebar-toggle-btn { display: none; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .layout { flex-direction: column; }
  /* The tool list is an overlay drawer on mobile, not an inline block. As an
     inline block it inserted ~1140px above the content, so selecting a tool
     collapsed it again and left the page scrolled past the tool. As a fixed
     overlay the content underneath never moves. */
  .sidebar {
    position: fixed;
    top: var(--header-h, 58px);
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: auto;
    z-index: 180;
    display: none;
    flex-wrap: wrap;
    align-content: flex-start;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 10px;
    gap: 6px;
    background: var(--bg-sidebar);
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  body.sidebar-open .sidebar { display: flex; }
  /* Stop the page behind the drawer from scrolling with it. */
  body.sidebar-open { overflow: hidden; }
  .sidebar-search {
    position: sticky;
    top: 0;
    z-index: 1;
    background: var(--bg-sidebar);
    padding-bottom: 8px;
  }
  /* Comfortable tap targets in the drawer. */
  .nav-btn { min-height: 40px; display: inline-flex; align-items: center; }
  .sidebar-toggle-btn { display: inline-block; }
  .sidebar-section { padding: 0; }
  .sidebar-section-title { display: none; }
  .sidebar-search { width: 100%; padding: 4px; border-bottom: none; }
  .nav-btn {
    width: auto;
    padding: 5px 12px;
    border-left: none;
    border-bottom: 2px solid transparent;
    font-size: 0.8rem;
    border-radius: 6px;
  }
  .nav-btn.active {
    border-bottom-color: var(--violet);
    border-left: none;
    border-radius: 6px;
  }
  .main { padding: 16px; }
  .input-group { grid-template-columns: 1fr; }
  .input-group.triple { grid-template-columns: 1fr; }
  .input-group.quad { grid-template-columns: 1fr 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .header-status { gap: 4px; }
  .header-readout { display: none; }
  .header-actions { justify-content: flex-end; }
  .header-btn { font-size: 0.74rem; padding: 6px 10px; }
}

/* ── Arcade fullscreen ── */
#arcade-fs-wrapper:fullscreen,
#arcade-fs-wrapper:-webkit-full-screen,
#binblaster-fs-wrapper:fullscreen,
#binblaster-fs-wrapper:-webkit-full-screen {
  background: #020610;
  display: flex !important;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  padding: 12px;
  box-sizing: border-box;
  overflow: hidden;
}
#arcade-fs-wrapper:fullscreen canvas,
#arcade-fs-wrapper:-webkit-full-screen canvas,
#binblaster-fs-wrapper:fullscreen canvas,
#binblaster-fs-wrapper:-webkit-full-screen canvas {
  max-width: none !important;
  max-height: none !important;
  flex: 0 1 auto;
}

/* ── Trying To Be Normal game ── */
#tbn-game {
  position: relative;
  min-height: 420px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #060a14;
}

/* ── Canvas for LSI/TCC charts ── */
canvas {
  display: block;
  max-width: 100%;
  border-radius: 8px;
}

/* ── Photometrics / special content wrappers ── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

/* ── Scrollbar global ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(139,123,255,0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(139,123,255,0.4); }

/* ── Tooltip-like status badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.badge-ok {
  background: rgba(74,222,128,0.12);
  color: var(--green-ok);
  border: 1px solid rgba(74,222,128,0.25);
}
.badge-warn {
  background: rgba(251,191,36,0.1);
  color: #fbbf24;
  border: 1px solid rgba(251,191,36,0.25);
}
.badge-err {
  background: var(--red-dim);
  color: var(--red);
  border: 1px solid rgba(239,68,68,0.3);
}

/* ── Blinking cursor (kept for any legacy use) ── */
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}
.cursor {
  display: inline-block;
  color: var(--violet);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

/* ── Conduit-fill conductor rows ─────────────────────────────────────────── */
.cfa-row {
  display: grid;
  grid-template-columns: 4.5rem auto minmax(0, 1fr) minmax(0, 1.3fr) 2rem;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.cfa-row .cfa-x {
  color: var(--fg-muted);
  font-size: 0.8rem;
  text-align: center;
}
.cfa-row input,
.cfa-row select { margin: 0; }
.cfa-del {
  background: rgba(255, 138, 138, 0.12);
  border: 1px solid rgba(255, 138, 138, 0.3);
  color: #ff8a8a;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  line-height: 1;
  padding: 7px 0;
  transition: background 0.15s ease;
}
.cfa-del:hover { background: rgba(255, 138, 138, 0.25); }
.cfa-actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 14px; }
.btn-secondary {
  background: rgba(139, 123, 255, 0.12);
  border: 1px solid rgba(139, 123, 255, 0.35);
  color: var(--violet);
}
.btn-secondary:hover { background: rgba(139, 123, 255, 0.22); }
.cfa-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 0.78rem;
  color: var(--fg-muted);
}
.cfa-check input { width: auto; margin: 0; }

/* Narrow screens: let the conductor row wrap instead of squeezing the selects */
@media (max-width: 560px) {
  .cfa-row {
    grid-template-columns: 4rem auto minmax(0, 1fr) 2rem;
  }
  .cfa-row .cfa-insul { grid-column: 1 / -1; }
}

/* ── PDF submittal export ────────────────────────────────────────────────── */
.report-export-btn {
  margin-top: 10px;
  font-size: 0.76rem;
  padding: 7px 14px;
}
.report-modal {
  position: fixed;
  inset: 0;
  z-index: 400;
  background: rgba(3, 4, 10, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
}
.report-modal[hidden] { display: none; }
body.report-open { overflow: hidden; }
.report-panel {
  background: #0a0c18;
  border: 1px solid var(--violet-ring);
  border-radius: var(--radius);
  box-shadow: 0 24px 70px -12px rgba(0, 0, 0, 0.8);
  width: 100%;
  max-width: 440px;
  max-height: calc(100vh - 40px);
  display: flex;
  flex-direction: column;
}
.report-panel-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.report-panel-head h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
  margin: 0;
}
.report-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  line-height: 1;
}
.report-close:hover { background: rgba(255, 255, 255, 0.06); color: var(--fg); }
.report-panel-body { padding: 16px; overflow-y: auto; }
.report-intro {
  font-size: 0.74rem;
  line-height: 1.55;
  color: var(--fg-muted);
  margin-bottom: 14px;
}
.report-field { margin-bottom: 12px; }
.report-preview {
  margin-top: 4px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(139, 123, 255, 0.06);
}
.report-preview-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--fg);
}
.report-preview-sub {
  font-size: 0.7rem;
  color: var(--fg-muted);
  margin-top: 3px;
}
.report-status { font-size: 0.74rem; margin-top: 10px; min-height: 1em; color: var(--fg-muted); }
.report-status.ok { color: var(--green-ok); }
.report-status.warn { color: #f5c451; }
.report-panel-foot {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}
@media (max-width: 560px) {
  .report-modal { padding: 0; align-items: stretch; }
  .report-panel { max-width: none; max-height: 100vh; border-radius: 0; border: none; }
}

/* ── 555 timer waveform ──────────────────────────────────────────────────── */
.wave-host {
  background: #070912;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  overflow-x: auto;
}
.wave-host svg { display: block; min-width: 380px; }

/* Power Wizard: phase-aware teaching plot */
.power-wave-panel {
  margin: 18px 0;
  padding: 14px;
  border: 1px solid rgba(139, 123, 255, 0.28);
  border-radius: 12px;
  background: linear-gradient(145deg, rgba(139, 123, 255, 0.08), rgba(96, 165, 250, 0.04));
}
.power-wave-heading { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-bottom: 8px; color: var(--fg-muted); font-size: 0.78rem; }
.power-wave-heading strong { color: var(--fg); font-family: var(--font-display); font-size: 0.92rem; }
.power-wave-panel svg { display: block; width: 100%; height: auto; min-height: 150px; }
.power-wave-panel .wave-axis { stroke: rgba(255,255,255,0.17); stroke-width: 1; stroke-dasharray: 4 5; }
.power-wave-panel .wave-voltage { fill: none; stroke: #60a5fa; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.power-wave-panel .wave-current { fill: none; stroke: #f5c451; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.power-wave-panel .wave-phase-b { fill: none; stroke: #6ee7b7; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.power-wave-panel .wave-phase-c { fill: none; stroke: #ff8a8a; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.power-wave-panel .wave-label { font: 600 12px var(--font-main), monospace; }
.power-wave-panel .wave-label-voltage { fill: #60a5fa; }
.power-wave-panel .wave-label-current { fill: #f5c451; }
.power-wave-panel .wave-angle { fill: var(--fg); font: 600 12px var(--font-main), monospace; }
.wave-note { margin: 8px 0 0; color: var(--fg-muted); font-size: 0.75rem; line-height: 1.55; }
.wave-note strong { color: var(--fg); }

/* ── Transformer engine: side-by-side compare + proof drawer ─────────────── */
.res-row.xe-compare {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}
.res-row.xe-compare .res-val { text-align: right; }
.res-row.xe-compare .xe-pri { color: #7aa2ff; }
.res-row.xe-compare .xe-sec { color: #6ee7b7; }
.xe-proof {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #070912;
  padding: 12px;
  max-height: 460px;
  overflow-y: auto;
}
.xe-step { padding: 10px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.xe-step:last-child { border-bottom: none; }
.xe-step-head {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--violet);
  margin-bottom: 6px;
}
.xe-step-line {
  font-family: var(--font-main);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
}
.xe-step-ref {
  margin-top: 5px;
  font-size: 0.68rem;
  color: var(--fg-dim);
  font-style: italic;
}
@media (max-width: 620px) {
  .res-row.xe-compare {
    grid-template-columns: 1fr auto;
  }
  .res-row.xe-compare .xe-pri { grid-column: 2; }
  .res-row.xe-compare .xe-sec { grid-column: 2; }
}

/* ── Saved jobs (local-first storage) ────────────────────────────────────── */
.save-run-btn {
  font-size: 0.76rem;
  padding: 7px 14px;
}
/* Holds the export and save buttons for one result. */
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.result-actions .report-export-btn { margin-top: 0; }
.proj-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(139, 123, 255, 0.045);
  padding: 12px 14px;
  margin-bottom: 12px;
}
.proj-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}
.proj-name {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  word-break: break-word;
}
.proj-count {
  font-size: 0.68rem;
  color: var(--violet);
  border: 1px solid var(--violet-ring);
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
}
.proj-meta {
  flex-basis: 100%;
  font-size: 0.68rem;
  color: var(--fg-dim);
}
.proj-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 10px 0 4px;
}
.proj-btn {
  font-size: 0.7rem;
  padding: 5px 11px;
}
.proj-danger { color: #f5a3a3; border-color: rgba(245, 163, 163, 0.35); }
.proj-danger:hover { background: rgba(245, 163, 163, 0.1); }
.proj-run {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.proj-run-info { flex: 1 1 200px; min-width: 0; }
.proj-run-label {
  font-size: 0.78rem;
  color: var(--fg);
  word-break: break-word;
}
.proj-run-date {
  font-size: 0.67rem;
  color: var(--fg-dim);
  margin-top: 2px;
  word-break: break-word;
}
.proj-run-actions {
  display: flex;
  gap: 6px;
  margin-left: auto;
}
.proj-empty {
  font-size: 0.76rem;
  color: var(--fg-muted);
  line-height: 1.6;
  margin: 0;
}
.proj-usage {
  font-size: 0.68rem;
  color: var(--fg-dim);
  margin-top: 10px;
}

/* ── Transformer Wizard ── */
.xw-steps { display: flex; gap: 0; margin-bottom: 16px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.xw-step-tab { flex: 1; padding: 8px 4px; font-size: 0.72rem; text-align: center; background: var(--bg-card); color: var(--fg-muted); cursor: pointer; border: none; font-family: var(--font-main); transition: background 0.2s; }
.xw-step-tab.active { background: var(--violet-soft); color: var(--violet); font-weight: 700; }
.xw-type-card { border: 1.5px solid var(--border); border-radius: 8px; padding: 12px; margin-bottom: 10px; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.xw-type-card:hover { border-color: var(--violet); background: var(--violet-soft); }
.xw-type-card.selected { border-color: #6ee7b7; background: rgba(110,231,183,0.08); }
.xw-type-title { font-weight: 700; color: var(--violet); font-size: 0.9rem; margin-bottom: 4px; }
.xw-type-ctx { font-size: 0.78rem; color: var(--fg-muted); margin-bottom: 6px; line-height: 1.5; }
.xw-pros { font-size: 0.75rem; color: #6ee7b7; padding-left: 0; list-style: none; margin-bottom: 6px; }
.xw-pros li { margin-bottom: 2px; }
.xw-nec-note { font-size: 0.72rem; color: #f5c451; background: rgba(245,196,81,0.06); border-left: 2px solid #f5c451; padding: 4px 8px; border-radius: 0 4px 4px 0; }
.xw-svg-wrap { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }

/* ── Circuit Simulator ── */
.cs-schematic { background: #0d1117; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 12px; }
.cs-bode { background: #0d1117; border: 1px solid var(--border); border-radius: 6px; margin: 8px 0; }
.cs-example-btns { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.cs-example-btn { padding: 6px 12px; font-size: 0.78rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--fg-muted); cursor: pointer; font-family: var(--font-main); transition: border-color 0.2s, color 0.2s; }
.cs-example-btn:hover, .cs-example-btn.active { border-color: var(--violet); color: var(--violet); }
.cs-details-btn { font-size: 0.74rem; color: var(--blue); background: none; border: none; cursor: pointer; padding: 0; font-family: var(--font-main); text-decoration: underline; }
.cs-step-box { background: rgba(79,139,255,0.06); border: 1px solid rgba(79,139,255,0.2); border-radius: 6px; padding: 10px; font-size: 0.78rem; color: var(--fg-muted); line-height: 1.6; margin-top: 8px; }
.tool-doc-card { margin: 14px 0 18px; padding: 16px; border: 1px solid rgba(139,123,255,0.24); border-radius: 12px; background: linear-gradient(180deg, rgba(139,123,255,0.09), rgba(255,255,255,0.02)); }
.tool-doc-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.tool-doc-title { font-size: 0.76rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: #c4b5fd; margin-bottom: 8px; }
.tool-doc-copy { margin: 0; font-size: 0.82rem; line-height: 1.7; color: var(--fg-muted); }
.tool-doc-list { margin: 0; padding-left: 18px; font-size: 0.8rem; line-height: 1.65; color: var(--fg-muted); }
.tool-doc-list li + li { margin-top: 6px; }
.tool-doc-example-list { list-style: disc; }
.tool-doc-btn { margin-top: 12px; min-height: 34px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-card); color: var(--fg); cursor: pointer; font: 700 0.76rem var(--font-main); transition: border-color 0.2s, color 0.2s, transform 0.2s; }
.tool-doc-btn:hover { border-color: var(--violet); color: var(--violet); transform: translateY(-1px); }

/* ── Smith Chart ── */
.sc-canvas-wrap { position: relative; display: inline-block; }
#sc-canvas { cursor: crosshair; border-radius: 8px; display: block; }
.sc-point-list { font-size: 0.78rem; max-height: 200px; overflow-y: auto; }
.sc-point-row { display: flex; gap: 10px; align-items: center; padding: 3px 0; border-bottom: 1px solid var(--border); }
.sc-ex-btns { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.sc-ex-btn { padding: 5px 10px; font-size: 0.76rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 5px; color: var(--fg-muted); cursor: pointer; font-family: var(--font-main); transition: border-color 0.2s; }
.sc-ex-btn:hover { border-color: var(--violet); color: var(--violet); }

/* ── STEM Tools ── */
.stem-tab-group .tab-btn { font-size: 0.72rem; padding: 6px 10px; }
.stem-canvas { border-radius: 8px; display: block; background: #0d1117; }
.stem-svg-wrap { display: flex; justify-content: center; margin: 8px 0; }
.stem-result-tbl { width: 100%; border-collapse: collapse; font-size: 0.8rem; margin: 8px 0; }
.stem-result-tbl th { background: var(--violet-soft); color: var(--violet); padding: 4px 8px; text-align: left; }
.stem-result-tbl td { padding: 4px 8px; border-bottom: 1px solid var(--border); }
.stem-result-tbl tr:hover td { background: var(--bg-card); }
.stem-highlight { color: #6ee7b7; font-weight: 700; }
.stem-formula { font-family: monospace; background: var(--bg-input); border-radius: 4px; padding: 2px 6px; color: #f5c451; }

/* ── Digital logic workbench ── */
.digital-grid-secondary { margin-top: 16px; }
.logic-expression { width: 100%; resize: vertical; min-height: 74px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 7px; color: var(--fg); padding: 9px; font: 0.82rem/1.45 var(--font-main); }
.logic-expression:focus { outline: 2px solid var(--violet-ring); border-color: var(--violet); }
.logic-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.logic-inputs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.logic-inputs label { display: inline-flex; align-items: center; gap: 6px; min-height: 32px; border: 1px solid var(--border); border-radius: 6px; padding: 0 9px; color: var(--fg-muted); cursor: pointer; font-size: 0.78rem; }
.logic-inputs input { accent-color: var(--violet); }
.logic-output { margin-top: 12px; padding: 10px; border-radius: 7px; background: var(--violet-soft); border: 1px solid var(--violet-ring); font: 700 1rem var(--font-main); color: var(--violet); }
.logic-gate-editor { display: grid; gap: 7px; }
.logic-gate-row { display: grid; grid-template-columns: 40px 1fr 1fr 1fr auto; align-items: center; gap: 6px; }
.logic-gate-row select { min-width: 0; }
.logic-gate-name { color: var(--blue); font: 700 0.76rem var(--font-main); }
.logic-remove { padding: 4px 8px; min-height: 30px; }
.logic-diagram { overflow-x: auto; background: #0d1117; border: 1px solid var(--border); border-radius: 8px; min-height: 270px; }
.logic-diagram svg { display: block; min-width: 560px; width: 100%; height: auto; }
.logic-truth-table { overflow-x: auto; }
.logic-truth-table table, .target-pair-result table { width: 100%; border-collapse: collapse; font-size: 0.77rem; }
.logic-truth-table th, .target-pair-result th { text-align: left; color: var(--violet); background: var(--violet-soft); }
.logic-truth-table th, .logic-truth-table td, .target-pair-result th, .target-pair-result td { padding: 6px 8px; border-bottom: 1px solid var(--border); font-family: var(--font-main); white-space: nowrap; }
.logic-on { color: var(--green-ok); font-weight: 700; }
.logic-off { color: var(--fg-dim); }
.target-pair-result { margin-top: 12px; overflow-x: auto; }
.target-pair-result .note { margin: 8px 0 0; }
.tool-note { margin: 8px 0 12px; color: var(--fg-muted); font-size: 0.78rem; line-height: 1.5; }
.manual-price-book { margin: 10px 0 12px; border: 1px solid rgba(139, 123, 255, 0.28); border-radius: 10px; background: rgba(139, 123, 255, 0.05); }
.manual-price-book summary { padding: 10px 12px; color: var(--fg); cursor: pointer; font-weight: 700; }
.manual-price-book > p { margin: 0 12px 10px; color: var(--fg-muted); font-size: 0.78rem; line-height: 1.5; }
.manual-price-rows { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; padding: 0 12px 12px; }
.manual-price-row { display: grid; grid-template-columns: minmax(0, 1fr) 78px; align-items: center; gap: 6px; color: var(--fg-muted); font: 0.76rem var(--font-main); }
.manual-price-row input { min-width: 0; padding: 7px; }
.cost-optimum { border-left: 3px solid var(--green-ok); padding-left: 10px; }
.analog-tabs { margin-bottom: 16px; }
.analog-fields { display: grid; gap: 10px; margin: 12px 0; }
.analog-fields .input-group { margin: 0; }
.analog-response-card { margin-top: 16px; }
.analog-plot { overflow-x: auto; background: #0d1117; border: 1px solid var(--border); border-radius: 8px; min-height: 260px; }
.analog-plot svg { display: block; width: 100%; min-width: 560px; height: auto; }
.analog-plot-label { color: var(--fg-muted); font-size: 0.75rem; font-weight: 400; margin-left: 6px; }
.analog-diagram-grid { margin-top: 16px; }
.analog-schematic { overflow-x: auto; background: #0d1117; border: 1px solid var(--border); border-radius: 8px; padding: 4px; }
.analog-schematic svg { display: block; width: 100%; min-width: 460px; height: auto; }
.emp-diagram { overflow-x: auto; background: #0d1117; border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.emp-diagram svg { display: block; width: 100%; height: auto; }
.card-grid.emp-diagram-grid { grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr)); }
.analog-formula { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.95rem; color: #e2e8f0; background: #0d1117; border: 1px solid var(--border); border-left: 3px solid #8b7bff; border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; overflow-x: auto; }
.analog-formula-sub { border-left-color: #5ed7ff; color: #cbd5f5; font-size: 0.85rem; }
.analog-formula-note { color: var(--fg-muted); font-size: 0.82rem; line-height: 1.55; margin: 0; }
.battery-tabs { margin-bottom: 16px; }
.battery-table { overflow-x: auto; }
.battery-table table { width: 100%; border-collapse: collapse; font-size: 0.78rem; }
.battery-table th, .battery-table td { padding: 7px 9px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
.battery-table th { color: var(--violet); background: var(--violet-soft); }
.battery-layout { min-height: 260px; overflow: auto; background: #0d1117; border: 1px solid var(--border); border-radius: 8px; }
.battery-layout svg { display: block; min-width: 420px; width: 100%; height: auto; }

/* ── E-bike battery pack designer ── */
.ebd-tool-wrap { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.ebd-tool-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.ebd-tool-row { display: flex; flex-wrap: wrap; gap: 8px; }
.ebd-tool-btn { margin-top: 0; }
.ebd-tool-btn.active {
  background: rgba(139, 123, 255, 0.28);
  border-color: var(--violet);
  color: #fff;
}
.ebd-status {
  margin: 4px 0 10px;
  color: var(--fg-muted);
  font-size: 0.8rem;
  line-height: 1.5;
}
.ebd-view-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
}
.ebd-view-tabs .tab-btn {
  margin: 0;
}
.ebd-view-tabs .tab-btn.active {
  background: rgba(139, 123, 255, 0.28);
  border-color: var(--violet);
  color: #fff;
}
.input-group.ebd-cell-specs {
  grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
}
.ebd-workspace {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(139, 123, 255, 0.08), transparent 55%),
    #070a12;
  padding: 10px;
  margin-bottom: 12px;
}
.ebd-workspace-3d {
  background:
    radial-gradient(ellipse at 70% 10%, rgba(79, 139, 255, 0.12), transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(139, 123, 255, 0.08), transparent 45%),
    #070a12;
}
.ebd-canvas {
  display: block;
  max-width: 100%;
  height: auto;
  touch-action: none;
  cursor: crosshair;
  border-radius: 6px;
}
.ebd-canvas[data-mode="erase"] { cursor: cell; }
.ebd-canvas-3d { cursor: grab; width: 100%; }
.ebd-canvas-3d:active { cursor: grabbing; }
.ebd-3d-hint {
  margin: 8px 2px 0;
  color: var(--fg-dim);
  font-size: 0.74rem;
}
.ebd-group-bars {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.ebd-group-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, hsl(var(--ebd-hue) 62% 45%) 45%, var(--border));
  background: color-mix(in srgb, hsl(var(--ebd-hue) 62% 38%) 22%, transparent);
  font-size: 0.74rem;
  color: var(--fg-muted);
}
.ebd-group-chip strong { color: var(--fg); font-weight: 700; }
.ebd-group-chip.is-ok {
  border-color: rgba(110, 231, 183, 0.45);
  color: #a7f3d0;
}
.ebd-group-chip.is-ok strong { color: #6ee7b7; }
@media (max-width: 720px) {
  .ebd-tool-row .btn { flex: 1 1 calc(50% - 8px); justify-content: center; }
}
@media (max-width: 620px) { .logic-gate-row { grid-template-columns: 34px 1fr 1fr auto; } .logic-gate-row select:nth-of-type(3) { grid-column: 2 / span 2; } }
@media (max-width: 620px) { .manual-price-rows { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ── Linear programming optimizer ── */
.orlp-presets { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.orlp-presets .btn { margin-top: 0; }
.orlp-formulation {
  margin: 0;
  padding: 12px 14px;
  background: #0d1117;
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet);
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--fg);
  white-space: pre-wrap;
  overflow-x: auto;
}
.orlp-var-host { display: grid; gap: 10px; }
.orlp-var-row {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr 0.8fr;
  gap: 8px;
}
.orlp-var-row[hidden],
.orlp-cons-row[hidden],
.orlp-cons-head [hidden],
.orlp-cons-row [hidden] {
  display: none !important;
}
.orlp-cons-host { overflow-x: auto; }
.orlp-cons-table { min-width: 640px; display: grid; gap: 6px; }
.orlp-cons-row {
  display: grid;
  grid-template-columns: minmax(90px, 1.2fr) repeat(6, minmax(64px, 0.8fr)) 72px minmax(72px, 0.9fr);
  gap: 6px;
  align-items: center;
}
.orlp-cons-head { color: var(--fg-muted); font-size: 0.7rem; letter-spacing: 0.04em; text-transform: uppercase; }
.orlp-visual { margin-top: 14px; }
.orlp-visual svg { display: block; width: 100%; max-width: 640px; height: auto; border-radius: 8px; }
.orlp-visual-caption { color: var(--fg-muted); font-size: 0.78rem; line-height: 1.5; margin-bottom: 10px; }
.orlp-vertex-table { width: 100%; max-width: 640px; border-collapse: collapse; font-size: 0.78rem; margin-top: 10px; }
.orlp-vertex-table th, .orlp-vertex-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: right; font-family: var(--font-main); }
.orlp-vertex-table th { color: var(--violet); text-align: left; }
.orlp-vertex-table td:first-child, .orlp-vertex-table th:first-child { text-align: left; }
.orlp-opt-row { color: var(--green-ok); font-weight: 700; }
.orlp-n-summary { display: grid; gap: 8px; margin-top: 8px; }
.orlp-bar-row { display: grid; grid-template-columns: minmax(80px, 140px) 1fr minmax(80px, auto); gap: 8px; align-items: center; font-size: 0.8rem; }
.orlp-bar-track { height: 10px; background: rgba(255,255,255,0.08); border-radius: 99px; overflow: hidden; }
.orlp-bar-fill { display: block; height: 100%; background: var(--violet); border-radius: 99px; }
.result.orlp-status-infeasible, .result.orlp-status-unbounded { border-left-color: var(--yellow, #f5c451); }

/* ── Number-base converter ── */
.nbc-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.82rem;
  color: var(--fg);
  cursor: pointer;
}
.nbc-check input { width: auto; accent-color: var(--violet); }
.nbc-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.nbc-chip {
  min-width: 72px;
  padding: 8px 10px;
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  justify-items: center;
  gap: 2px;
}
.nbc-chip-zero { opacity: 0.45; }
.nbc-chip-digit { font-size: 1.05rem; font-weight: 700; color: var(--violet); font-family: var(--font-main); }
.nbc-chip-place { font-size: 0.68rem; color: var(--fg-muted); }
.nbc-chip-val { font-size: 0.72rem; color: var(--fg); font-family: var(--font-main); }
.nbc-bits { overflow-x: auto; margin-top: 12px; }
.nbc-bit-row { display: flex; flex-wrap: wrap; gap: 4px; align-items: flex-end; }
.nbc-byte-gap { width: 10px; flex: 0 0 10px; }
.nbc-bit {
  width: 34px;
  padding: 4px 0 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0d1117;
  color: var(--fg-muted);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-family: var(--font-main);
}
.nbc-bit-idx { font-size: 0.58rem; color: var(--fg-dim); }
.nbc-bit-val { font-size: 0.95rem; font-weight: 700; }
.nbc-bit-on { border-color: rgba(139,123,255,0.55); color: var(--fg); background: var(--violet-soft); }
.nbc-bit-changed { box-shadow: 0 0 0 2px var(--yellow, #f5c451); }
@media (max-width: 720px) {
  .orlp-var-row { grid-template-columns: 1fr 1fr; }
  .nbc-bit { width: 28px; }
}

/* ── I/O list generator, signal scaling, and catalog/build-list grids ── */
.iol-table-wrap, .iol-grid-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.iol-table input, .iol-grid input {
  min-width: 4.5rem;
  padding: 5px 8px;
  font-size: 0.78rem;
}
.iol-grid input { min-width: 6.5rem; }
.iol-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 10px;
}
.iol-add-wrap {
  display: flex;
  align-items: flex-end;
}
.iol-add-wrap .btn { margin-top: 0; width: 100%; justify-content: center; }
.iol-station, .cab-numbering {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
  background: rgba(255,255,255,0.02);
}
.iol-station-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.iol-station-head .btn { margin-top: 0; }
.iol-cart {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.iol-cart li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--fg-muted);
}
.iol-cart-empty { border-style: dashed; }
.iol-file {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.iol-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 10px;
  font-size: 0.85rem;
  color: var(--fg-muted);
}
.iol-check input { width: auto; margin: 0; }
.iol-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0 10px;
  font-size: 0.72rem;
}
.iol-legend span {
  padding: 3px 8px;
  border-radius: 999px;
}
.iol-generic { margin-top: 8px; }
.iol-takeoff-sum { margin-top: 8px; }
.iol-table tr.iol-sig-di td, .iol-grid tr.iol-sig-di td, .res-row.iol-sig-di,
.iol-cart li.iol-sig-di, .iol-legend .iol-sig-di { background: rgba(59,130,246,0.28); color: #dbeafe; }
.iol-table tr.iol-sig-do td, .iol-grid tr.iol-sig-do td, .res-row.iol-sig-do,
.iol-cart li.iol-sig-do, .iol-legend .iol-sig-do { background: rgba(237,137,54,0.32); color: #feebc8; }
.iol-table tr.iol-sig-ai td, .iol-grid tr.iol-sig-ai td, .res-row.iol-sig-ai,
.iol-cart li.iol-sig-ai, .iol-legend .iol-sig-ai { background: rgba(72,187,120,0.28); color: #c6f6d5; }
.iol-table tr.iol-sig-ai-v td, .iol-grid tr.iol-sig-ai-v td, .iol-legend .iol-sig-ai-v { background: rgba(56,161,105,0.34); color: #c6f6d5; }
.iol-table tr.iol-sig-ao td, .iol-grid tr.iol-sig-ao td, .res-row.iol-sig-ao,
.iol-cart li.iol-sig-ao, .iol-legend .iol-sig-ao { background: rgba(56,178,172,0.30); color: #b2f5ea; }
.iol-table tr.iol-sig-rtd td, .iol-grid tr.iol-sig-rtd td, .iol-legend .iol-sig-rtd { background: rgba(159,122,234,0.32); color: #e9d8fd; }
.iol-table tr.iol-sig-tc td, .iol-grid tr.iol-sig-tc td, .iol-legend .iol-sig-tc { background: rgba(128,90,213,0.36); color: #e9d8fd; }
.iol-table tr.iol-sig-iolink td, .iol-grid tr.iol-sig-iolink td, .iol-cart li.iol-sig-iolink, .iol-legend .iol-sig-iolink { background: rgba(237,100,166,0.30); color: #fed7e2; }
.iol-table tr.iol-sig-coupler td, .iol-grid tr.iol-sig-coupler td, .res-row.iol-sig-coupler,
.iol-cart li.iol-sig-coupler, .iol-legend .iol-sig-coupler { background: rgba(113,128,150,0.32); color: #e2e8f0; }
.iol-table tr.iol-sig-power td, .iol-grid tr.iol-sig-power td, .res-row.iol-sig-power,
.iol-cart li.iol-sig-power, .iol-legend .iol-sig-power { background: rgba(229,62,62,0.32); color: #fed7d7; }
.iol-table tr.iol-sig-other td, .iol-grid tr.iol-sig-other td { background: rgba(160,174,192,0.18); }
.iol-table.ref-table tr:nth-child(even).iol-sig-di td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-di td { background: rgba(59,130,246,0.28); }
.iol-table.ref-table tr:nth-child(even).iol-sig-do td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-do td { background: rgba(237,137,54,0.32); }
.iol-table.ref-table tr:nth-child(even).iol-sig-ai td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-ai td { background: rgba(72,187,120,0.28); }
.iol-table.ref-table tr:nth-child(even).iol-sig-ao td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-ao td { background: rgba(56,178,172,0.30); }
.iol-table.ref-table tr:nth-child(even).iol-sig-rtd td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-rtd td { background: rgba(159,122,234,0.32); }
.iol-table.ref-table tr:nth-child(even).iol-sig-tc td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-tc td { background: rgba(128,90,213,0.36); }
.iol-table.ref-table tr:nth-child(even).iol-sig-iolink td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-iolink td { background: rgba(237,100,166,0.30); }
.iol-table.ref-table tr:nth-child(even).iol-sig-coupler td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-coupler td { background: rgba(113,128,150,0.32); }
.iol-table.ref-table tr:nth-child(even).iol-sig-power td,
.iol-grid.ref-table tr:nth-child(even).iol-sig-power td { background: rgba(229,62,62,0.32); }
.ebus-neg td { outline: 1px solid #fc8181; }
.ebus-low td { outline: 1px solid #f6e05e; }
.ssc-slider-wrap { margin: 8px 0 12px; }
.ssc-slider-wrap input[type="range"] {
  width: 100%;
  accent-color: var(--violet);
  height: 1.6rem;
}
.ssc-slider-wrap input[type="range"]:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}
.ssc-formula {
  margin: 0;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet);
  background: rgba(0,0,0,0.35);
  color: var(--fg);
  font-family: var(--font-main);
  font-size: 0.8rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-x: auto;
}
.ssc-flag {
  margin: 10px 0 0;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid rgba(239,68,68,0.45);
  background: var(--red-dim);
  color: #fca5a5;
  font-size: 0.8rem;
  line-height: 1.45;
}
.ssc-preset-ul {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.ssc-preset-ul li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.ssc-preset-ul .btn { margin-top: 0; }
.btn:focus-visible, .btn-remove:focus-visible, .tab-btn:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 2px;
}
@media (max-width: 720px) {
  .iol-station-head { flex-wrap: wrap; }
}

/* ── Field lookups: torque, load worksheet, wire colors ── */
.tq-hero { font-size: 1.35rem; font-weight: 700; color: var(--fg); margin: 8px 0; }
.tq-unit { color: var(--fg-muted); font-size: 0.75rem; }
.tq-si { color: var(--fg-muted); font-size: 0.72rem; }
.tq-table td { vertical-align: top; }
.lw-table input, .lw-table select {
  width: 100%;
  min-width: 0;
  font-size: 0.78rem;
}
.lw-table { min-width: 720px; }
.lw-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.wc-system { margin: 0 0 22px; }
.wc-system-title {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 10px;
  color: var(--fg);
}
.wc-swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 10px;
}
.wc-swatch {
  border-radius: var(--radius);
  padding: 16px 14px;
  min-height: 168px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}
.wc-swatch-name { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; }
.wc-swatch-role { font-size: 0.82rem; margin: 6px 0 10px; opacity: 0.92; }
.wc-swatch-cite { font-size: 0.72rem; line-height: 1.45; margin-top: 10px; opacity: 0.88; }
.wc-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(0,0,0,0.28);
}
.wc-badge-code { background: #14532d; color: #bbf7d0; }
.wc-badge-conv { background: rgba(0,0,0,0.35); }
.wc-swatch-safety { outline: 2px solid #facc15; }
.wc-safety {
  margin-top: 10px;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.4;
}
@media print {
  body.tq-printing .sidebar, body.tq-printing header, body.tq-printing .nav-btn { display: none !important; }
  body.tq-printing .section { display: none !important; }
  body.tq-printing #sec-torque-lookup.active,
  body.tq-printing #sec-wire-colors.active { display: block !important; }
  .wc-swatch { break-inside: avoid; }
}

/* ── Phone-sensor field tools (lux, pitch/hum, spectrum, sound level) ── */
.note-warn {
  background: rgba(245, 196, 81, 0.08);
  border-color: rgba(245, 196, 81, 0.38);
  color: var(--fg);
}
.note-warn::before { content: '⚠ '; color: var(--yellow); }
.note-privacy {
  background: rgba(74, 222, 128, 0.06);
  border-color: rgba(74, 222, 128, 0.28);
}
.note-privacy::before { content: '🔒 '; color: var(--green-ok); }
.note-prominent {
  font-size: 0.82rem;
  padding: 12px 14px;
  margin: 0 0 16px;
  line-height: 1.55;
}
.sensor-gate {
  display: grid;
  gap: 10px;
  padding: 12px 14px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
}
.sensor-gate p { margin: 0; color: var(--fg-muted); font-size: 0.8rem; line-height: 1.55; }
.sensor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.sensor-actions .btn { margin-top: 0; }
.sensor-status {
  font-size: 0.78rem;
  color: var(--fg-muted);
  line-height: 1.45;
}
.sensor-status.is-live { color: var(--green-ok); }
.sensor-status.is-error { color: var(--red); }
.sensor-status.is-busy { color: var(--yellow); }
.sensor-readout {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--fg);
}
.sensor-readout-unit {
  display: block;
  margin-top: 4px;
  font-family: var(--font-main);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.sensor-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(140px, 100%), 1fr));
  gap: 10px;
  margin: 12px 0;
}
.sensor-stat {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.28);
}
.sensor-stat-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 4px;
}
.sensor-stat-val {
  font-family: var(--font-main);
  font-size: 1.05rem;
  color: var(--fg);
}
.sensor-canvas {
  display: block;
  width: 100%;
  height: 220px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0d1117;
}
.sensor-preview {
  position: relative;
  width: 100%;
  max-height: 280px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #0d1117;
}
.sensor-preview video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  background: #000;
}
.sensor-preview-reticle {
  position: absolute;
  inset: 22%;
  border: 2px dashed rgba(139, 123, 255, 0.7);
  border-radius: 50%;
  pointer-events: none;
}
.sensor-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 10px 0;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.82rem;
  color: var(--fg);
  cursor: pointer;
}
.sensor-check input {
  width: auto;
  accent-color: var(--violet);
}
.sensor-level {
  height: 10px;
  margin: 10px 0 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 99px;
  overflow: hidden;
}
.sensor-level span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--violet);
  border-radius: 99px;
}
.btn.is-on {
  background: rgba(139, 123, 255, 0.28);
  border-color: var(--violet);
  color: #fff;
}
.sensor-hidden-canvas { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }

/* ── Photo safety + on-device OCR ── */
.photo-safety {
  border: 1px solid rgba(245, 196, 81, 0.45);
  background: rgba(245, 196, 81, 0.08);
  color: var(--fg);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 14px;
  font-size: 0.82rem;
  line-height: 1.55;
}
.photo-safety strong { color: var(--yellow); }
.photo-privacy {
  border: 1px solid rgba(74, 222, 128, 0.35);
  background: rgba(74, 222, 128, 0.08);
  color: var(--fg);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 14px;
  font-size: 0.82rem;
  line-height: 1.55;
}
.ocr-drop {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 140px;
  padding: 16px;
  text-align: center;
  border: 2px dashed rgba(139, 123, 255, 0.45);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}
.ocr-drop.is-dragover {
  background: rgba(251, 191, 36, 0.08);
  border-color: rgba(251, 191, 36, 0.8);
}
.ocr-preview {
  display: block;
  max-width: 100%;
  max-height: 280px;
  margin: 10px auto 0;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.review-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 12px 0;
  font-size: 0.85rem;
  text-transform: none;
  letter-spacing: 0;
  cursor: pointer;
  color: var(--fg);
}
.review-check input { width: auto; margin-top: 3px; accent-color: var(--violet); }
.vlm-settings {
  border: 1px solid rgba(139, 123, 255, 0.35);
  background: rgba(139, 123, 255, 0.06);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 0 0 14px;
}
.vlm-settings .note { margin-top: 0; }
.photo-privacy.is-upload {
  border-color: rgba(248, 113, 113, 0.45);
  background: rgba(248, 113, 113, 0.08);
}
.ocr-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 0 0;
}
.ocr-progress-bar {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.ocr-progress-fill {
  width: 0;
  height: 100%;
  background: var(--violet, #8b7bff);
}
.ocr-source {
  margin: 8px 0 0;
  font-size: 0.78rem;
  color: var(--fg-muted, #b8b4c8);
}
.ocr-low-conf {
  outline: 2px solid #e6b800;
  background: rgba(230, 184, 0, 0.12);
}
.ocr-why {
  margin: 8px 0 0;
  padding-left: 1.2em;
  font-size: 0.78rem;
  color: var(--fg-muted, #b8b4c8);
}
.ocr-why[hidden] { display: none; }
.ocr-dual {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
  font-size: 0.8rem;
}
.ocr-chip {
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--fg);
  font: inherit;
  cursor: pointer;
}

/* ── NEMA wiring field reference ── */
.nema-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.nema-chip {
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--fg);
  font-family: var(--font-main);
  font-size: 0.82rem;
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.nema-chip span { font-size: 0.68rem; color: var(--fg-muted); }
.nema-chip.is-active, .nema-chip[aria-current="true"] {
  border-color: var(--violet);
  background: var(--violet-soft);
  color: var(--fg);
}
.nema-diagram-wrap {
  max-width: 360px;
  margin: 0 auto;
}
.nema-diagram-wrap svg { width: 100%; height: auto; display: block; }
.nema-face {
  display: grid;
  gap: 12px;
}
@media print {
  .sidebar, header, .sidebar-toggle-btn, .nema-chip:not(.is-active) { display: none !important; }
  .section { display: block !important; }
  body { background: #fff; color: #111; }
}

@media (max-width: 720px) {
  .nema-chip { flex: 1 1 calc(50% - 8px); }
}
.nema-colors { display: grid; gap: 14px; }
.photo-caution {
  border: 1px solid rgba(248, 113, 113, 0.55);
  background: rgba(248, 113, 113, 0.1);
  color: var(--fg);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 10px 0 14px;
  font-size: 0.82rem;
  line-height: 1.55;
}
.photo-caution[hidden] { display: none; }
.flag-ask {
  margin: 10px 0 0;
  padding-left: 1.1rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--fg-muted);
}
.review-gate {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--yellow);
}


/* ── Calculation visual export ── */
.calculation-visual {
  position: relative;
  margin: 12px 0 8px;
}
.calculation-visual-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 6px;
}
.calculation-visual-export {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--fg-muted);
  font: 600 11px/1 var(--font-display);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}
.calculation-visual-export:hover {
  color: var(--fg);
  border-color: var(--border-hover);
  background: var(--violet-soft);
}

/* ── Solar design wizard ── */
.solar-sensor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(160px, 220px);
  gap: 16px;
  align-items: center;
}
@media (max-width: 720px) {
  .solar-sensor-layout { grid-template-columns: 1fr; }
}
.solar-sensor-value {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.02em;
  min-height: 1.6em;
}
.solar-orient-gauge {
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
  color: var(--fg-muted);
}
.solar-check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-main);
  font-size: 0.92rem;
  color: var(--fg);
  cursor: pointer;
}
.solar-check input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--violet);
}
.solar-match-ok { color: #34d399 !important; }
.solar-match-off { color: var(--fg-muted); }