/* ═══════════════════════════════════════════════════════════════════════
   BASE-1 product page — its own look.
   Not the /dk product template: a dark launch page with its own rhythm,
   loaded only on this route and scoped to .b1 so nothing leaks. It still
   reads the design system's tokens, so the brand colour stays consistent.
   ═══════════════════════════════════════════════════════════════════════ */
.b1 {
  /* Every one of these was a fixed near-black or pale green, so the board
     pages stayed dark while the rest of the site went light - the same site
     in two different skins, one scroll apart. They are the site's own tokens
     now, so these pages follow the theme like every other page. */
  --ink:   var(--bg);
  --panel: var(--bg2);
  --panel2:var(--bg3);
  --line:  var(--border);
  --line2: color-mix(in srgb, var(--primary) 45%, var(--border));
  --mut:   var(--fg2);
  --soft:  var(--fg);
  --mono:  'JetBrains Mono', ui-monospace, monospace;
  background: var(--ink);
  color: var(--fg);
  /* Legibility: the page ran at the browser default with 15px body copy.
     Everything below is sized off this. */
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.b1 ::selection { background: var(--primary); color: var(--primary-fg); }
.b1-wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.b1 b { color: var(--fg); font-weight: 700; }

/* ── Shared bits ── */
.b1-eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--primary); margin-bottom: 12px; }
.b1-h2 { font-family: var(--mono); font-size: clamp(24px, 3.4vw, 38px); font-weight: 700; color: var(--fg); margin: 0 0 14px; line-height: 1.15; letter-spacing: -.01em; }
.b1-sub { color: var(--mut); font-size: 15px; line-height: 1.75; max-width: 62ch; }
.b1-sec { padding: 76px 0; border-top: 1px solid var(--line); }
.b1-note-line { font-family: var(--mono); font-size: 12.5px; color: var(--mut); line-height: 1.8; margin-top: 20px; }

.b1-btn {
  display: inline-block; box-sizing: border-box; text-align: center; cursor: pointer; text-decoration: none;
  font-family: var(--mono); font-size: 13px; padding: 13px 20px;
  background: var(--primary); color: var(--primary-fg); border: 1px solid var(--primary);
}
.b1-btn:hover { filter: brightness(1.08); }
.b1-btn--ghost { background: none; color: var(--fg); border-color: var(--line2); }
.b1-btn--ghost:hover { border-color: var(--primary); color: var(--primary); filter: none; }
.b1-btn--sm { padding: 11px 16px; font-size: 12px; }

.b1-preview {
  border: 1px solid color-mix(in srgb, #e0b13e 45%, transparent);
  background: color-mix(in srgb, #e0b13e 10%, transparent);
  color: color-mix(in srgb, #c08a1e 62%, var(--fg)); font-family: var(--mono); font-size: 12.5px; line-height: 1.75;
  padding: 14px 16px; margin-bottom: 30px;
}

/* ── Hero ── */
.b1-hero { position: relative; padding: 64px 0 60px; overflow: hidden; }
.b1-hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(58% 46% at 18% 0%, color-mix(in srgb, var(--primary) 18%, transparent), transparent 72%),
    linear-gradient(to right, var(--line) 1px, transparent 1px) 0 0 / 72px 72px,
    linear-gradient(to bottom, var(--line) 1px, transparent 1px) 0 0 / 72px 72px;
  opacity: .55; pointer-events: none;
}
.b1-hero > * { position: relative; }
.b1-crumb { font-family: var(--mono); font-size: 11.5px; color: var(--mut); margin-bottom: 20px; }
.b1-crumb a { color: var(--mut); text-decoration: none; }
.b1-crumb a:hover { color: var(--primary); }
.b1-crumb span { color: var(--line2); margin: 0 4px; }

.b1-tag {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--primary); border: 1px solid var(--line2); padding: 6px 12px;
}
.b1-tag i { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); display: block; }

.b1-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 48px; align-items: center; }
.b1-hero-grid > * { min-width: 0; }
.b1-title {
  font-family: var(--mono); font-weight: 800; line-height: .9; letter-spacing: -.03em;
  margin: 0 0 20px; display: grid; max-width: 100%; overflow-wrap: break-word;
}
.b1-title__a { font-size: clamp(34px, 5.4vw, 68px); color: var(--fg); }
.b1-title__b { font-size: clamp(34px, 5.4vw, 68px); color: var(--primary); }
.b1-title__b em { font-style: normal; font-size: 1.3em; line-height: .8; display: inline-block; transform: translateY(.05em); margin-right: .04em; }
.b1-lede { font-size: 16px; line-height: 1.7; color: var(--soft); max-width: 46ch; }
.b1-hero-cta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }

.b1-shot { margin: 0; border: 1px solid var(--line2); background: var(--panel); padding: 14px; min-width: 0; }
.b1-shot img { width: 100%; height: auto; display: block; background: #fff; }
.b1-shot figcaption { font-family: var(--mono); font-size: 11px; color: var(--mut); padding: 12px 2px 0; line-height: 1.6; }

.b1-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); margin-top: 44px; border: 1px solid var(--line); }
.b1-stat { background: var(--ink); padding: 20px 18px; }
.b1-stat b { display: block; font-family: var(--mono); font-size: 26px; color: var(--primary); line-height: 1; }
.b1-stat span { display: block; font-size: 12.5px; color: var(--mut); margin-top: 8px; line-height: 1.45; }

/* ── Annotated board ── */
.b1-board { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 28px; align-items: start; margin-top: 32px; }
.b1-board__figure { border: 1px solid var(--line2); background: var(--panel); padding: 14px; position: sticky; top: 96px; }
.b1-board__inner { position: relative; line-height: 0; }
.b1-board__inner img { width: 100%; height: auto; display: block; background: #fff; transition: filter .25s; }
.b1-board.has-sel .b1-board__inner img { filter: saturate(.55) brightness(.82); }

.b1-dot {
  position: absolute; transform: translate(-50%, -50%);
  width: 26px; height: 26px; padding: 0; cursor: pointer;
  border-radius: 50%; border: 2px solid var(--primary);
  /* This dot sits ON the board photo, not on the page ground, so it needs a
     dark disc in both themes - --primary-fg is white on the light theme and
     would vanish against the photo's white plate. */
  background: color-mix(in srgb, #04140d 72%, transparent);
  display: grid; place-items: center;
  transition: transform .18s, box-shadow .18s, background .18s;
}
.b1-dot::after {
  content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--primary);
  transition: opacity .18s;
}
.b1-dot__ref {
  position: absolute; left: 50%; top: -8px; transform: translate(-50%, -100%);
  font-family: var(--mono); font-size: 10px; letter-spacing: .08em; white-space: nowrap;
  color: var(--primary-fg); background: var(--primary); padding: 3px 7px;
  opacity: 0; pointer-events: none; transition: opacity .18s;
}
.b1-dot:hover, .b1-dot:focus-visible, .b1-dot.is-on {
  background: var(--primary); transform: translate(-50%, -50%) scale(1.18);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--primary) 26%, transparent);
  outline: none;
}
.b1-dot:hover::after, .b1-dot.is-on::after { opacity: 0; }
.b1-dot:hover .b1-dot__ref, .b1-dot:focus-visible .b1-dot__ref, .b1-dot.is-on .b1-dot__ref { opacity: 1; }

.b1-board__list { display: grid; gap: 8px; max-height: 620px; overflow-y: auto; padding-right: 6px; }
.b1-board__list::-webkit-scrollbar { width: 6px; }
.b1-board__list::-webkit-scrollbar-thumb { background: var(--line2); }
.b1-part {
  display: grid; grid-template-columns: 54px 1fr; gap: 12px; align-items: start; text-align: left;
  border: 1px solid var(--line); background: var(--panel); padding: 12px 14px; cursor: pointer;
  transition: border-color .18s, background .18s, transform .18s;
}
.b1-part:hover, .b1-part:focus-visible, .b1-part.is-on {
  border-color: var(--primary); background: color-mix(in srgb, var(--primary) 10%, var(--panel));
  transform: translateX(3px); outline: none;
}
.b1-part__ref {
  font-family: var(--mono); font-size: 12px; font-weight: 700; color: var(--primary);
  border: 1px solid var(--line2); padding: 4px 0; text-align: center;
}
.b1-part.is-on .b1-part__ref { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.b1-part__name { display: block; font-family: var(--mono); font-size: 13.5px; color: var(--fg); margin-bottom: 4px; }
.b1-part__why { display: block; font-size: 13px; color: var(--mut); line-height: 1.6; }

.b1-facts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.b1-fact {
  font-family: var(--mono); font-size: 11.5px; color: var(--mut);
  border: 1px dashed var(--line2); padding: 7px 11px;
}
.b1-fact b { color: var(--primary); font-weight: 700; }

/* ── Power chain ── */
.b1-chain { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; border: 1px solid var(--line2); }
.b1-chain__step {
  position: relative; padding: 20px 16px; border-right: 1px solid var(--line);
  background: var(--panel); display: flex; flex-direction: column; gap: 6px;
}
.b1-chain__step:last-child { border-right: 0; background: color-mix(in srgb, var(--primary) 10%, var(--panel)); }
.b1-chain__step::after {
  content: '→'; position: absolute; right: -9px; top: 50%; transform: translateY(-50%);
  color: var(--primary); font-size: 14px; z-index: 2;
  background: var(--ink); padding: 2px;
}
.b1-chain__step:last-child::after { content: none; }
.b1-chain__n { font-family: var(--mono); font-size: 10px; color: var(--primary); opacity: .8; }
.b1-chain__name { font-family: var(--mono); font-size: 13px; color: var(--fg); line-height: 1.35; }
.b1-chain__what { font-size: 12.5px; color: var(--mut); line-height: 1.5; }
.b1-chain__badge {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--primary); border: 1px solid var(--line2); padding: 3px 7px; align-self: flex-start; margin-top: auto;
}

/* ── Headers ── */
.b1-headers { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin-top: 32px; }
.b1-header { border: 1px solid var(--line); background: var(--panel); padding: 18px; }
.b1-header__top { display: flex; align-items: baseline; gap: 10px; margin-bottom: 14px; }
.b1-header__ref { font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--primary); }
.b1-header__name { font-family: var(--mono); font-size: 12.5px; color: var(--fg); }
.b1-header__pins { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.b1-pin {
  font-family: var(--mono); font-size: 11px; color: var(--soft);
  border: 1px solid var(--line2); background: var(--panel2); padding: 5px 9px;
}
.b1-header__note { font-size: 12.5px; color: var(--mut); line-height: 1.6; margin: 0; }

/* ── Builds ── */
.b1-projects { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 32px; }
.b1-proj {
  border: 1px solid var(--line); background: var(--panel);
  padding: 18px 16px; display: flex; flex-direction: column; gap: 8px;
  transition: transform .18s, border-color .18s;
}
.b1-proj:hover { transform: translateY(-3px); border-color: var(--primary); }
.b1-proj__n { font-family: var(--mono); font-size: 10px; color: var(--primary); opacity: .8; }
.b1-proj__icon { font-size: 22px; color: var(--primary); line-height: 1; }
.b1-proj__name { font-family: var(--mono); font-size: 13px; color: var(--fg); line-height: 1.4; }
.b1-proj__uses { display: flex; flex-wrap: wrap; gap: 4px; }
.b1-proj__uses i {
  font-style: normal; font-family: var(--mono); font-size: 9.5px; letter-spacing: .06em;
  color: var(--mut); border: 1px solid var(--line); padding: 2px 6px;
}
.b1-proj__add { font-family: var(--mono); font-size: 10.5px; color: var(--mut); margin-top: auto; }
.b1-proj__add.none { color: var(--primary); }

/* ── REV B ── */
.b1-rev { display: grid; gap: 20px; margin-top: 32px; }
.b1-rev__group { border: 1px solid var(--line2); background: var(--panel); }
.b1-rev__head {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--primary);
}
.b1-rev__head b { color: var(--fg); letter-spacing: 0; text-transform: none; font-size: 14px; }
.b1-rev__item { padding: 16px 18px; border-bottom: 1px solid var(--line); }
.b1-rev__item:last-child { border-bottom: 0; }
.b1-rev__t { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.b1-rev__name { font-family: var(--mono); font-size: 14px; color: var(--fg); }
.b1-rev__d { font-size: 13.5px; color: var(--mut); line-height: 1.7; margin: 0; max-width: 76ch; }
.b1-pill { font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; padding: 3px 8px; border: 1px solid; }
.b1-pill--new { color: var(--primary); border-color: var(--line2); background: color-mix(in srgb, var(--primary) 12%, transparent); }
.b1-pill--better { color: color-mix(in srgb, #2f6fd0 62%, var(--fg)); border-color: color-mix(in srgb, #6aa8ff 50%, transparent); background: color-mix(in srgb, #6aa8ff 10%, transparent); }
.b1-pill--variation { color: var(--mut); border-color: var(--line); }

.b1-count { display: flex; gap: 28px; flex-wrap: wrap; align-items: baseline; border: 1px solid var(--line2); background: var(--panel); padding: 20px; margin-top: 24px; }
.b1-count b { font-family: var(--mono); font-size: 30px; color: var(--primary); line-height: 1; }
.b1-count span { font-size: 13px; color: var(--mut); line-height: 1.6; }
.b1-count > div { max-width: 46ch; }

.b1-limits { border: 1px solid var(--line); padding: 18px; margin-top: 20px; }
.b1-limits__h { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--mut); margin-bottom: 12px; }
.b1-limits__list { display: flex; flex-wrap: wrap; gap: 8px; }
.b1-limits__list span { font-family: var(--mono); font-size: 11.5px; color: var(--mut); border: 1px dashed var(--line2); padding: 6px 10px; }

/* ── Spec, box, buy ── */
.b1-buy { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 40px; align-items: start; }
.b1-spec { border: 1px solid var(--line2); margin-top: 24px; }
.b1-spec__row { display: grid; grid-template-columns: 210px 1fr; gap: 20px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.b1-spec__row:last-child { border-bottom: 0; }
.b1-spec__row:nth-child(odd) { background: color-mix(in srgb, var(--primary) 3%, transparent); }
.b1-spec__k { font-family: var(--mono); font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--mut); }
.b1-spec__v { font-size: 14px; color: var(--fg); line-height: 1.65; }

.b1-box { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 24px; }
.b1-box__item { border: 1px solid var(--line); background: var(--panel); padding: 16px; display: flex; gap: 12px; align-items: flex-start; }
.b1-box__q { font-family: var(--mono); font-size: 12px; color: var(--primary); flex: none; }
.b1-box__t { font-size: 14px; color: var(--fg); line-height: 1.5; }
.b1-box__s { font-size: 12.5px; color: var(--mut); margin-top: 4px; display: block; line-height: 1.5; }

.b1-card { border: 1px solid var(--line2); background: var(--panel); padding: 22px; position: sticky; top: 96px; }
.b1-price { font-family: var(--mono); font-size: 26px; color: var(--primary); font-weight: 700; }
.b1-price small { display: block; font-size: 11px; color: var(--mut); font-weight: 400; margin-top: 6px; letter-spacing: .1em; text-transform: uppercase; }
.b1-card .b1-btn { display: block; width: 100%; margin-top: 14px; }
.b1-card__spec { border-top: 1px solid var(--line); margin-top: 20px; padding-top: 16px; display: grid; gap: 9px; }
.b1-card__spec div { display: flex; justify-content: space-between; gap: 12px; font-family: var(--mono); font-size: 11.5px; }
.b1-card__spec span { color: var(--mut); }
.b1-card__spec b { color: var(--fg); font-weight: 400; text-align: right; }
.b1-note { font-family: var(--mono); font-size: 11px; color: var(--mut); line-height: 1.75; margin-top: 16px; }

/* ── FAQ ── */
.b1-faq { border-top: 1px solid var(--line); margin-top: 28px; }
.b1-faq details { border-bottom: 1px solid var(--line); }
.b1-faq summary {
  cursor: pointer; padding: 18px 0; list-style: none;
  font-family: var(--mono); font-size: 14px; color: var(--fg);
  display: flex; justify-content: space-between; gap: 16px;
}
.b1-faq summary::-webkit-details-marker { display: none; }
.b1-faq summary::after { content: '+'; color: var(--primary); flex: none; }
.b1-faq details[open] summary::after { content: '−'; }
.b1-faq p { color: var(--mut); font-size: 14px; line-height: 1.8; margin: 0 0 18px; max-width: 78ch; }

/* ── Responsive ── */
@media (max-width: 1100px) {
  .b1-chain { grid-template-columns: repeat(3, 1fr); }
  .b1-chain__step:nth-child(3n)::after { content: none; }
  .b1-chain__step:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .b1-projects { grid-template-columns: repeat(3, 1fr); }
  .b1-title__a, .b1-title__b { font-size: clamp(32px, 5vw, 52px); }
}
@media (max-width: 980px) {
  .b1-hero-grid, .b1-buy, .b1-board { grid-template-columns: 1fr; gap: 30px; }
  .b1-card, .b1-board__figure { position: static; }
  .b1-board__list { max-height: none; }
  .b1-stats { grid-template-columns: repeat(2, 1fr); }
  .b1-box { grid-template-columns: repeat(2, 1fr); }
  .b1-title__a, .b1-title__b { font-size: clamp(36px, 8vw, 60px); }
}
@media (max-width: 720px) {
  .b1-projects { grid-template-columns: repeat(2, 1fr); }
  .b1-chain { grid-template-columns: repeat(2, 1fr); }
  .b1-chain__step::after { content: none; }
  .b1-chain__step { border-bottom: 1px solid var(--line); }
}
@media (max-width: 560px) {
  .b1-sec { padding: 52px 0; }
  .b1-box { grid-template-columns: 1fr; }
  .b1-spec__row { grid-template-columns: 1fr; gap: 6px; }
  .b1-projects { grid-template-columns: 1fr; }
  .b1-chain { grid-template-columns: 1fr; }
  .b1-part { grid-template-columns: 46px 1fr; }
  .b1-dot { width: 22px; height: 22px; }
}
@media (hover: none) and (pointer: coarse) {
  .b1-dot { width: 30px; height: 30px; }
  .b1-btn { min-height: 46px; }
}
@media (prefers-reduced-motion: reduce) {
  .b1-proj, .b1-part, .b1-dot, .b1-board__inner img { transition: none; }
  .b1-proj:hover, .b1-part:hover { transform: none; }
}

/* ═══════════════════════════════════════════════════════════════════════
   OTHER OWN BOARDS — index cards, GPIO pinout, solder levels
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Index cards ── */
.b1-boards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.b1-bcard {
  display: flex; flex-direction: column; text-decoration: none;
  border: 1px solid var(--line2); background: var(--panel);
  transition: transform .2s, border-color .2s;
}
.b1-bcard:hover { transform: translateY(-4px); border-color: var(--primary); }
.b1-bcard__img { display: block; background: #f4f4f2; padding: 16px; }
.b1-bcard__img img { width: 100%; height: 190px; object-fit: contain; display: block; }
.b1-bcard__body { display: flex; flex-direction: column; gap: 10px; padding: 20px; flex: 1; }
.b1-bcard__top { display: flex; align-items: baseline; gap: 10px; }
.b1-bcard__name { font-family: var(--mono); font-size: 18px; font-weight: 700; color: var(--fg); letter-spacing: .02em; }
.b1-bcard__rev { font-family: var(--mono); font-size: 10px; color: var(--primary); border: 1px solid var(--line2); padding: 2px 6px; }
.b1-bcard__tag { font-family: var(--mono); font-size: 12px; color: var(--primary); }
.b1-bcard__blurb { font-size: 13.5px; color: var(--mut); line-height: 1.65; }
.b1-bcard__chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 2px; }
.b1-bcard__chips i {
  font-style: normal; font-family: var(--mono); font-size: 10px;
  color: var(--mut); border: 1px solid var(--line); padding: 3px 7px;
}
.b1-bcard__go { font-family: var(--mono); font-size: 12px; color: var(--primary); margin-top: auto; padding-top: 6px; }

/* ── GPIO pinout ── */
.b1-legend { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 18px; }
.b1-leg { display: inline-flex; align-items: center; gap: 7px; font-family: var(--mono); font-size: 11.5px; color: var(--mut); }
.b1-leg i { width: 11px; height: 11px; display: block; border: 1px solid color-mix(in srgb, var(--fg) 25%, transparent); }
.b1-leg--v5 i { background: #d4423f; } .b1-leg--v33 i { background: #e08a2e; }
.b1-leg--gnd i { background: #2a2a2a; } .b1-leg--i2c i { background: #2f6fd0; }
.b1-leg--spi i { background: #7a4bd0; } .b1-leg--uart i { background: #1f7f86; }
.b1-leg--pwm i { background: #21883f; }

.b1-pinout { border: 1px solid var(--line2); background: var(--panel); padding: 10px 0; }
.b1-prow {
  display: grid; align-items: center;
  grid-template-columns: 1fr 30px 22px 22px 30px 1fr;
  padding: 3px 14px;
}
.b1-prow:nth-child(odd) { background: color-mix(in srgb, var(--primary) 4%, transparent); }
.b1-prow__n { font-family: var(--mono); font-size: 10.5px; color: var(--mut); text-align: center; }
.b1-prow__hole {
  width: 15px; height: 15px; border-radius: 50%; justify-self: center;
  border: 3px solid #d8b24a; background: var(--panel2); box-sizing: border-box;
}
.b1-prow__label {
  font-family: var(--mono); font-size: 12.5px; color: var(--soft);
  padding: 4px 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.b1-prow__label--l { text-align: right; }
.b1-prow__label--r { text-align: left; }
.b1-g-v5   { color: #ff8b88 !important; } .b1-g-v33  { color: #f0b969 !important; }
.b1-g-gnd  { color: var(--fg2) !important; } .b1-g-i2c  { color: #7fb2ff !important; }
.b1-g-spi  { color: #b795ff !important; } .b1-g-uart { color: #5fc8d0 !important; }
.b1-g-pwm  { color: #5ed17f !important; } .b1-g-rsv  { color: #7b8a84 !important; }
.b1-g-io   { color: var(--soft) !important; }
.b1-prow__hole.b1-g-v5 { border-color: #d4423f; } .b1-prow__hole.b1-g-v33 { border-color: #e08a2e; }
.b1-prow__hole.b1-g-gnd { border-color: #6d7a74; } .b1-prow__hole.b1-g-i2c { border-color: #2f6fd0; }
.b1-prow__hole.b1-g-spi { border-color: #7a4bd0; } .b1-prow__hole.b1-g-uart { border-color: #1f7f86; }
.b1-prow__hole.b1-g-pwm { border-color: #21883f; }

.b1-warn {
  font-family: var(--mono); font-size: 13px; color: color-mix(in srgb, #e5646a 68%, var(--fg)); line-height: 1.7;
  border: 1px solid color-mix(in srgb, #e5646a 45%, transparent);
  background: color-mix(in srgb, #e5646a 9%, transparent);
  padding: 13px 16px; margin-top: 22px;
}
.b1-warn b { color: var(--fg); }
.b1-qref { display: grid; gap: 5px; }
.b1-qref span { font-family: var(--mono); font-size: 12px; color: var(--soft); }

/* ── Solder levels ── */
.b1-levels { list-style: none; margin: 32px 0 0; padding: 0; display: grid; gap: 12px; }
.b1-level {
  display: grid; grid-template-columns: 58px 1fr; gap: 18px; align-items: start;
  border: 1px solid var(--line); background: var(--panel); padding: 18px;
}
.b1-level__n {
  font-family: var(--mono); font-size: 26px; font-weight: 800; color: var(--primary);
  border: 1px solid var(--line2); text-align: center; padding: 8px 0; line-height: 1;
}
.b1-level__top { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.b1-level__name { font-family: var(--mono); font-size: 15px; color: var(--fg); }
.b1-level__count { font-family: var(--mono); font-size: 11px; color: var(--primary); border: 1px solid var(--line2); padding: 3px 8px; }
.b1-level__why { font-size: 13.5px; color: var(--mut); line-height: 1.7; margin: 0; max-width: 76ch; }

.b1-pass {
  display: flex; gap: 16px; align-items: center; margin-top: 24px;
  border: 1px solid var(--line2); background: color-mix(in srgb, var(--primary) 8%, var(--panel)); padding: 20px;
}
.b1-pass__icon {
  width: 44px; height: 44px; flex: none; display: grid; place-items: center;
  background: var(--primary); color: var(--primary-fg); font-size: 22px;
}
.b1-pass__t { font-family: var(--mono); font-size: 15px; color: var(--fg); margin-bottom: 4px; }
.b1-pass__d { font-size: 13.5px; color: var(--mut); line-height: 1.65; margin: 0; }

@media (max-width: 980px) {
  .b1-boards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .b1-boards { grid-template-columns: 1fr; }
  .b1-prow { grid-template-columns: 1fr 26px 18px 18px 26px 1fr; padding: 3px 8px; }
  .b1-prow__label { font-size: 11px; padding: 4px 5px; }
  .b1-prow__hole { width: 12px; height: 12px; border-width: 2px; }
}
@media (max-width: 560px) {
  .b1-level { grid-template-columns: 44px 1fr; gap: 12px; padding: 14px; }
  .b1-level__n { font-size: 20px; }
  .b1-pass { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { .b1-bcard { transition: none; } .b1-bcard:hover { transform: none; } }


/* ── REV B change list (plain, not a map) ── */
.b1-changelist { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 10px; margin-top: 28px; }
.b1-changelist .b1-part { cursor: default; }
.b1-changelist .b1-part:hover { background: var(--panel); }
.b1-part--add  .b1-part__ref { color: color-mix(in srgb, #2f6fd0 62%, var(--fg)); }
.b1-part--fix  .b1-part__ref { color: var(--primary); }
.b1-part--safe .b1-part__ref { color: color-mix(in srgb, #e5646a 68%, var(--fg)); }
.b1-part--safe { border-color: color-mix(in srgb, #e5646a 40%, transparent); }

/* ── Two-up: data beside a figure ── */
.b1-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 28px; align-items: start; margin-top: 32px; }
.b1-headers--tight { margin-top: 0; grid-template-columns: 1fr; gap: 10px; }
.b1-fig { margin: 0; border: 1px solid var(--line2); background: var(--panel); padding: 14px; }
.b1-fig img { width: 100%; height: auto; display: block; background: #fff; }
.b1-fig figcaption { font-family: var(--mono); font-size: 11.5px; color: var(--mut); line-height: 1.7; margin-top: 12px; }

@media (max-width: 900px) {
  .b1-split { grid-template-columns: 1fr; }
}