/* Buttons, sidebar sections, fields, tooltips, banners, modals, bench list. */

:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------- buttons */

.btn {
  font: inherit;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 120ms ease, border-color 120ms ease;
}

.btn:hover { background: var(--panel-3); }
.btn:active { transform: translateY(1px); }

.btn[disabled] { opacity: 0.45; cursor: not-allowed; }
.btn[disabled]:active { transform: none; }

/* One primary call to action per panel section. */
.btn--primary {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-ink);
  width: 100%;
}

.btn--primary:hover { filter: brightness(1.08); background: var(--accent-strong); }

.btn--ghost { background: transparent; border-color: transparent; color: var(--text-dim); }
.btn--ghost:hover { background: var(--panel-2); }

/*
 * An icon button: a disc with one glyph or one drawing in it.
 *
 * For controls whose meaning is carried by the title and the accessible name
 * rather than a word on the face. Sized from the same minimum as the other
 * header buttons so the row stays on one baseline.
 */
.btn--icon {
  width: 32px;
  min-width: 32px;
  height: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  text-decoration: none;
}

.btn--icon .btn__glyph {
  font-size: 15px;
  line-height: 1;
  /* The glyphs are the theme discs; they must not inherit the letter-spacing
     the button text uses. */
  letter-spacing: 0;
}

.btn--icon svg { display: block; }

.btn--small { padding: 3px 8px; font-size: 12px; }

/* ------------------------------------------------------- segmented tabs */

.segmented {
  display: flex;
  flex: 0 0 auto;
  gap: 2px;
  padding: 3px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.segmented__btn {
  font: inherit;
  font-weight: 500;
  flex: 1 1 0;
  min-height: 34px;
  line-height: 1.4;
  padding: 7px 10px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
}

.segmented__btn:hover { color: var(--text); background: var(--panel-3); }

.tab-label--short { display: none; }

/* Below this width the full names no longer fit on one row. */
@media (max-width: 620px) {
  .tab-label--long { display: none; }
  .tab-label--short { display: inline; }
  .segmented__btn { padding: 7px 6px; }
}

.segmented__btn[aria-selected="true"] {
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  padding: 6px 9px;
}

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

.readout {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-5);
  padding: var(--space-4);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.readout__value {
  font-size: 32px;
  font-weight: 650;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.readout__value--error { font-size: 18px; font-weight: 550; color: var(--danger); }

.readout__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  color: var(--text-dim);
  font-size: 13px;
}

.readout__fact b {
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.readout__cta { margin-left: auto; }

/* -------------------------------------------------------------- banners */

.banners { display: flex; flex-direction: column; gap: var(--space-2); }

.banner {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid;
  border-left-width: 4px;
  border-radius: var(--radius);
  font-size: 13px;
}

.banner__icon { flex: 0 0 auto; font-weight: 700; line-height: 1.3; }
.banner__body { flex: 1 1 auto; min-width: 0; }
.banner__action { flex: 0 0 auto; align-self: center; }

.banner--info { background: var(--accent-soft); border-color: var(--accent); color: var(--text); }
.banner--warn { background: var(--warn-soft); border-color: var(--warn); color: var(--text); }
.banner--error { background: var(--danger-soft); border-color: var(--danger); color: var(--text); }

/* ------------------------------------------------------ sidebar sections */

.section { border-bottom: 1px solid var(--border); }

.section__head {
  font: inherit;
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  text-align: left;
}

.section__head:hover { background: var(--panel-2); color: var(--text); }

.section__title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.section__summary {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.section__chevron { transition: transform 150ms ease; flex: 0 0 auto; color: var(--text-faint); }
.section[data-open="true"] .section__chevron { transform: rotate(90deg); }

.section__body { padding: 0 var(--space-4) var(--space-4); }
.section[data-open="false"] .section__body { display: none; }

/* --------------------------------------------------------------- fields */

.field { margin-bottom: var(--space-3); }
.field:last-child { margin-bottom: 0; }

.field__label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
}

.field__hint { font-size: 12px; color: var(--text-faint); margin-top: var(--space-1); }

.input, .select {
  font: inherit;
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--panel-2);
  color: var(--text);
}

.input:focus, .select:focus { border-color: var(--accent-strong); }
.input[aria-invalid="true"] { border-color: var(--danger); }

.input--mono { font-family: var(--font-mono); letter-spacing: 0.06em; }

.row { display: flex; gap: var(--space-2); }
.row > * { flex: 1 1 0; min-width: 0; }
.row--tight { gap: var(--space-1); }

.check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: 13px;
  cursor: pointer;
  margin-bottom: var(--space-2);
}

.check input { margin-top: 3px; flex: 0 0 auto; }

.chipset { display: flex; flex-wrap: wrap; gap: var(--space-1); }

.chip {
  font: inherit;
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--text-dim);
  cursor: pointer;
}

.chip:hover { background: var(--panel-3); color: var(--text); }

.chip[aria-pressed="true"] {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-ink);
  font-weight: 600;
}

/* --------------------------------------------------------------- tooltip */

.info {
  font: inherit;
  font-size: 10px;
  font-weight: 700;
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: var(--panel-2);
  color: var(--text-faint);
  cursor: help;
  position: relative;
  padding: 0;
}

.info:hover, .info:focus-visible { border-color: var(--accent-strong); color: var(--accent-strong); }

.info__bubble {
  position: fixed;
  z-index: 300;
  width: max-content;
  max-width: min(280px, calc(100vw - 24px));
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.45;
  text-align: left;
  letter-spacing: 0;
  text-transform: none;
  white-space: normal;
  display: none;
  pointer-events: none;
}

/* ------------------------------------------------------------ band table */

.bandgrid { display: flex; flex-direction: column; gap: var(--space-2); }

.bandrow { display: flex; align-items: center; gap: var(--space-2); }

.bandrow__role {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-faint);
  width: 66px;
  flex: 0 0 auto;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.bandrow__swatch {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  border-radius: 4px;
  border: 1px solid var(--border-strong);
}

/* ------------------------------------------------------ power architecture */

.archdiagram {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  margin: 0 0 var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  color: var(--text-dim);
  overflow-x: auto;
  white-space: pre;
}

/* --------------------------------------------------------------- LED list */

.ledlist { display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-2); }

.ledrow { display: flex; flex-direction: column; gap: var(--space-1); }

.ledrow__head { display: flex; align-items: center; gap: var(--space-2); }

.ledrow__name {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.ledrow__swatch {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}

/* ------------------------------------------------------------ bench list */

.bench { display: flex; flex-direction: column; gap: var(--space-1); margin-bottom: var(--space-3); }

.bench__empty { font-size: 13px; color: var(--text-faint); margin-bottom: var(--space-3); }

.bench__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  font-size: 13px;
}

.bench__swatches { display: flex; gap: 2px; flex: 0 0 auto; }

.bench__swatch { width: 6px; height: 18px; border-radius: 1px; border: 1px solid rgb(0 0 0 / 20%); }

.bench__label { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bench__label b { font-variant-numeric: tabular-nums; }
.bench__note { display: block; font-size: 11px; color: var(--text-faint); }

/* ---------------------------------------------------------- combinations */

.complist { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-3); }

.complist__row { display: flex; align-items: center; gap: var(--space-2); }
.complist__row .input { flex: 1 1 auto; }
.complist__row .select { flex: 0 0 84px; }

.results { display: flex; flex-direction: column; gap: var(--space-1); }

.result {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.result__pair { font-family: var(--font-mono); font-size: 12px; }
.result__err { margin-left: auto; color: var(--text-faint); font-size: 12px; }
.result__err--exact { color: var(--ok); font-weight: 600; }

/* --------------------------------------------------------- explain panel */

.explain {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.explain__toggle {
  font: inherit;
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.explain__toggle:hover { background: var(--panel-2); }

.explain__chevron {
  font-size: 15px;
  line-height: 1;
  color: var(--text-faint);
  transition: transform 150ms ease;
  align-self: center;
}

.explain[data-open="true"] .explain__chevron { transform: rotate(90deg); }

.explain__title { font-weight: 650; }
.explain__hint { font-size: 12px; color: var(--text-faint); margin-left: auto; }

.explain__body-wrap {
  padding: 0 var(--space-4) var(--space-5);
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.6;
}

.explain[data-open="false"] .explain__body-wrap { display: none; }

.explain__intro {
  margin: 0 0 var(--space-4);
  color: var(--text);
  font-size: 15px;
}

.explain__block { margin-bottom: var(--space-4); }
.explain__block:last-of-type { margin-bottom: var(--space-3); }

.explain__heading {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 var(--space-2);
}

.explain__body { margin: 0 0 var(--space-2); color: var(--text-dim); }

.explain__formula {
  margin: var(--space-2) 0;
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--panel-2);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  overflow-x: auto;
}

.explain__example {
  margin: var(--space-2) 0 0;
  padding: var(--space-2) var(--space-3) var(--space-2) calc(var(--space-4) + 8px);
  border-radius: var(--radius);
  background: var(--accent-soft);
  list-style: none;
  counter-reset: step;
}

.explain__example li {
  position: relative;
  margin-bottom: var(--space-1);
  font-size: 13px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.explain__example li::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-strong);
}

.explain__example li:last-child { margin-bottom: 0; }

.explain__footnote {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-faint);
}

/* ---------------------------------------------------------------- modals */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgb(19 28 38 / 62%);
}

.modal {
  width: min(620px, 100%);
  max-height: min(84vh, 720px);
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal__head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
}

.modal__title { font-size: 17px; font-weight: 650; margin: 0; }
.modal__close { margin-left: auto; }

.modal__body { padding: var(--space-4); overflow-y: auto; font-size: 14px; }
.modal__body h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-dim); margin: var(--space-5) 0 var(--space-2); }
.modal__body h3:first-child { margin-top: 0; }
.modal__body p { margin: 0 0 var(--space-3); }
.modal__body ol, .modal__body ul { margin: 0 0 var(--space-3); padding-left: 1.3em; }
.modal__body li { margin-bottom: var(--space-2); }
.modal__body code { font-family: var(--font-mono); font-size: 12px; background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }

.modal__foot {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--panel-2);
}

.modal__foot .btn--primary { width: auto; margin-left: auto; }

/* --------------------------------------------------------------- helpers */

.muted { color: var(--text-faint); }
.stack { display: flex; flex-direction: column; gap: var(--space-3); }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.toast {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  background: var(--text);
  color: var(--panel);
  font-size: 13px;
  box-shadow: var(--shadow-md);
}

/* ------------------------------------------------------------- mode bar */
/* Its own row, under the header and above the tabs it governs. A control that
   governs the whole screen has to sit above the whole screen. */

.modebar-host  { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.modebar       { display: flex; gap: var(--space-1); flex: 0 0 auto; }
.modebar__chip { font-size: 12px; padding: 4px var(--space-3); }

.modebar__hint {
  flex: 1 1 240px;
  min-width: 0;
  font-size: 12px;
  line-height: 1.4;
  color: var(--text-faint);
}

@media (max-width: 640px) {         /* the one place the chips may grow */
  .modebar { flex: 1 1 100%; }
  .modebar__chip { flex: 1 1 0; }
  .modebar__hint { flex: 1 1 100%; }
}

/* ------------------------------------------------------- brand and coffee */

.brand__home {
  display: flex;
  align-items: center;
  border-radius: 6px;
  text-decoration: none;
}

.brand__home:hover { opacity: 0.85; }


/* ------------------------------------------------------------- spec panel */
/* A spec sheet, not a set of controls: one quiet block, no per-row borders
   so nothing in it reads as clickable. */

.specs {
  margin-top: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  font-size: 13px;
}

.specs__row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: 3px 0;
}

.specs__row + .specs__row { border-top: 1px solid var(--border); }

.specs__label { color: var(--text-faint); flex: 1 1 auto; min-width: 0; }

.specs__value {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: right;
  flex: 0 0 auto;
}

.specs__value--accent { color: var(--accent-strong); }

/* ----------------------------------------------------------------- guide */

.guide { display: flex; flex-direction: column; gap: var(--space-4); max-width: 900px; }
.guide__intro { margin: 0; color: var(--text-dim); max-width: 68ch; }
.guide__search { font-size: 15px; padding: 10px 12px; }

.guide__heading {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 var(--space-2);
}

.guide__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3);
  align-items: start;
}

.guide__card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.guide__card--faq { background: var(--panel); }
.guide__cardTitle { margin: 0; font-size: 14px; font-weight: 650; }
.guide__answer { margin: 0; font-size: 13px; color: var(--text-dim); }
.guide__steps { margin: 0; padding-left: 1.2em; font-size: 13px; color: var(--text-dim); }
.guide__steps li { margin-bottom: var(--space-1); }
.guide__card .btn { align-self: flex-start; }
.guide__empty { color: var(--text-dim); }

.guide__footer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

/* The guide is a page of text: let it fill the stage and sit at the top. */
.viewport__stage:has(.guide) { align-items: flex-start; justify-content: flex-start; }
.viewport__stage .guide { max-width: 900px; }