/* Adam Stankiewicz — AI Quality Engineering
   Production stylesheet. Structure breakpoints: 1024px, 900px, 480px. */

:root {
  --bg: #020617;
  --bg-alt: #030814;
  --bg-alt-2: #040a16;
  --bg-deep: #02050d;
  --surface: #07101d;
  --surface-2: rgba(10, 18, 32, .6);
  --surface-3: rgba(13, 23, 39, .8);
  --surface-inset: #040911;
  --border: #1d2a3d;
  --border-strong: #22304a;
  --hair: #162233;
  --text: #e8edf5;
  --text-soft: #c3ccd9;
  --muted: #9ca8ba;
  --muted-2: #8b98ab;
  --dim: #6f7d92;
  --dim-2: #5b6a80;
  --blue: #60a5fa;
  --blue-light: #93c5fd;
  --blue-ink: #04162e;
  --green: #34d399;
  --red: #fb7185;
  --yellow: #fbbf24;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: 'Geist', ui-sans-serif, system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --maxw: 1240px;
  --gutter: clamp(18px, 4vw, 44px);
  --radius: 12px;
  --grid-lines: linear-gradient(rgba(148, 163, 184, .026) 1px, transparent 1px),
                linear-gradient(90deg, rgba(148, 163, 184, .026) 1px, transparent 1px);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; }
h1, h2, h3, h4, p, dd, dl, figure { margin: 0; }
h1, h2, h3, p { text-wrap: pretty; }
ul, ol { list-style: none; margin: 0; padding: 0; }

a { color: var(--blue-light); text-decoration: none; }
a:hover { color: #dbeafe; }

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: var(--blue); color: var(--blue-ink); }

summary { list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
summary::marker { content: ''; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--blue);
  color: var(--blue-ink);
  padding: 12px 18px;
  border-radius: 0 0 8px 0;
  font: 700 13px/1 var(--mono);
}
.skip-link:focus { left: 0; color: var(--blue-ink); }

/* ---------- layout primitives ---------- */

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section {
  padding: clamp(64px, 8vw, 116px) 0;
  border-bottom: 1px solid var(--hair);
}
.section--tight { padding: clamp(56px, 7vw, 96px) 0; }
.section--last { border-bottom: 0; }
.section--alt { background: var(--bg-alt); }
.section--alt2 { background: var(--bg-alt-2); }
.section--grid { background-image: var(--grid-lines); background-size: 34px 34px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 56px); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stack-8 > * + * { margin-top: 8px; }

/* ---------- typography ---------- */

.eyebrow {
  font: 500 11px/1.4 var(--mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.eyebrow--blue { color: var(--blue); }
.eyebrow--hero {
  font-size: 11.5px;
  letter-spacing: .19em;
  color: var(--blue);
  margin-bottom: 24px;
}

.h1 {
  font-size: clamp(36px, 5.1vw, 68px);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -.042em;
  max-width: 15ch;
}
.h2 {
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -.038em;
}
.h2--sm { font-size: clamp(25px, 3vw, 38px); line-height: 1.1; letter-spacing: -.032em; }
.h3 { font-size: clamp(22px, 2vw, 28px); font-weight: 700; letter-spacing: -.025em; }

.lead {
  font-size: clamp(16px, 1.2vw, 19px);
  line-height: 1.6;
  color: var(--muted);
}
.lead--wide { max-width: 68ch; }
.body { font-size: 15.5px; line-height: 1.6; color: var(--muted); }
.body--soft { color: var(--text-soft); }
.note { font-size: 13.5px; line-height: 1.6; color: var(--muted-2); }

.tlabel {
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.tlabel--dim { color: var(--dim); letter-spacing: .12em; }
.mono { font-family: var(--mono); }
.micro {
  font: 500 11.5px/1.6 var(--mono);
  letter-spacing: .05em;
  color: var(--dim);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  padding: 17px 26px;
  border-radius: 8px;
  font-size: 15.5px;
  font-weight: 600;
  min-height: 50px;
  border: 1px solid transparent;
  transition: background-color .2s ease, border-color .2s ease, color .2s ease;
}
.btn--primary { background: var(--blue); color: var(--blue-ink); font-weight: 700; }
.btn--primary:hover { background: var(--blue-light); color: var(--blue-ink); }
.btn--secondary { border-color: var(--border-strong); background: rgba(13, 23, 39, .6); color: var(--text); }
.btn--secondary:hover { border-color: rgba(96, 165, 250, .5); color: var(--blue-light); }
.btn--outline {
  border-color: rgba(96, 165, 250, .4);
  background: rgba(96, 165, 250, .06);
  color: var(--blue-light);
}
.btn--outline:hover { background: rgba(96, 165, 250, .12); color: var(--blue-light); }
.btn--lg { padding: 19px 24px; font-size: 16px; min-height: 52px; }
.btn--sm { padding: 13px 18px; font-size: 14.5px; min-height: 46px; }
.btn--block { width: 100%; }
.btn .tag {
  font: 500 10.5px/1 var(--mono);
  letter-spacing: .08em;
  color: var(--muted-2);
}
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  background: rgba(2, 6, 23, .88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hair);
}
.site-header__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: flex; align-items: center; gap: 11px; color: inherit; flex-shrink: 0; }
.brand:hover { color: inherit; }
.brand__mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 7px;
  border: 1px solid rgba(96, 165, 250, .35);
  background: rgba(96, 165, 250, .09);
  display: grid;
  place-items: center;
  font: 600 12px/1 var(--mono);
  color: var(--blue);
}
.brand__name { display: block; font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.brand__sub {
  display: block;
  margin-top: 3px;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.site-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: clamp(16px, 2vw, 26px);
  font: 500 12px/1 var(--mono);
  letter-spacing: .06em;
}
.site-nav a { color: var(--muted); white-space: nowrap; }
.site-nav a:hover { color: var(--text); }
.header__right { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.lang {
  display: flex;
  align-items: center;
  gap: 6px;
  font: 500 11px/1 var(--mono);
  letter-spacing: .1em;
}
.lang a { color: var(--dim); }
.lang a:hover { color: var(--text); }
.lang [aria-current] { color: var(--text-soft); }
.lang__sep { color: var(--dim-2); }
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue);
  color: var(--blue-ink);
  padding: 12px 15px;
  border-radius: 7px;
  font: 700 11.5px/1 var(--mono);
  letter-spacing: .04em;
  min-height: 44px;
  flex-shrink: 0;
  transition: background-color .2s ease;
}
.header-cta:hover { background: var(--blue-light); color: var(--blue-ink); }
.header-cta .short { display: none; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  padding: clamp(112px, 12vw, 168px) 0 clamp(52px, 7vw, 84px);
  border-bottom: 1px solid var(--hair);
  background-image: var(--grid-lines);
  background-size: 34px 34px;
}
.hero__glow {
  position: absolute;
  top: -170px;
  left: -140px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: rgba(59, 130, 246, .08);
  filter: blur(120px);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 5vw, 72px);
  align-items: center;
}
.hero__copy p.lead { margin-top: 24px; max-width: 54ch; font-size: clamp(17px, 1.35vw, 20px); line-height: 1.58; }
.hero__actions { margin-top: 30px; }

/* ---------- test panel ---------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .4);
}
.panel__head {
  padding: 15px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-3);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.panel__case { margin-top: 6px; font: 500 13px/1.3 var(--mono); color: var(--text); }
.panel__meta { display: flex; align-items: flex-end; gap: 20px; }
.panel__meta dt { font: 500 10px/1.4 var(--mono); letter-spacing: .16em; color: var(--muted-2); }
.panel__meta dd {
  margin: 6px 0 0;
  display: flex;
  align-items: center;
  gap: 7px;
  font: 600 12.5px/1 var(--mono);
  letter-spacing: .06em;
}
#status-value { color: var(--blue); }
#status-value.is-fail { color: var(--red); }
#step-value { color: var(--muted); font-weight: 500; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); }
#status-value.is-fail .dot { background: var(--red); }
.panel__progress { height: 3px; background: #111c2e; }
.panel__progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: var(--blue);
  transition: transform .55s ease, background-color .4s ease;
}
.panel__progress span.is-fail { background: var(--red); }
.panel__body { padding: clamp(16px, 2vw, 20px); display: grid; gap: 9px; }

.trow {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  background: rgba(10, 18, 32, .75);
  opacity: .78;
  transition: opacity .45s ease, border-color .45s ease;
}
.trow.is-on { opacity: 1; }
.trow.is-focus { border-color: rgba(96, 165, 250, .6); }
.trow.is-focus-fail { border-color: rgba(251, 113, 133, .6); }
.trow__line { display: flex; gap: 14px; }
.trow__who {
  font: 500 10.5px/1.75 var(--mono);
  letter-spacing: .1em;
  color: var(--muted-2);
  width: 62px;
  flex-shrink: 0;
}
.trow__who--bot { color: var(--blue); }
.trow__text { font-size: 14.5px; line-height: 1.55; }
.trow__kv {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 7px 14px;
  font: 500 12.5px/1.5 var(--mono);
}
.trow__kv dt {
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--muted-2);
  line-height: 1.75;
}
.trow__kv dd { margin: 0; }
.trow__split {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.qbadge {
  margin-top: 11px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid rgba(52, 211, 153, .3);
  background: rgba(52, 211, 153, .06);
  font: 600 10.5px/1 var(--mono);
  letter-spacing: .08em;
  color: var(--green);
  opacity: 0;
  transition: opacity .4s ease;
}
.qbadge.is-on { opacity: 1; }
.qbadge__hint { color: var(--muted); letter-spacing: .06em; }

.status-fail { color: var(--red); }
.status-pass { color: var(--green); }
.fail-inline {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 600 12px/1 var(--mono);
  letter-spacing: .08em;
  color: var(--red);
}

.verdict {
  margin-top: 6px;
  border: 1px solid rgba(251, 113, 133, .38);
  background: rgba(251, 113, 133, .055);
  border-radius: 10px;
  padding: 18px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .5s ease, transform .5s ease;
}
.verdict.is-on { opacity: 1; transform: none; }
.verdict__label {
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--red);
}
.verdict__value { margin-top: 8px; font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.verdict__note { margin-top: 10px; font-size: 13.5px; line-height: 1.55; color: var(--muted); max-width: 46ch; }

.panel__foot {
  padding: 13px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  background: rgba(13, 23, 39, .5);
}
.replay {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--blue-light);
  padding: 10px 14px;
  border-radius: 6px;
  font: 600 11px/1 var(--mono);
  letter-spacing: .08em;
  cursor: pointer;
  min-height: 40px;
  transition: border-color .2s ease, background-color .2s ease;
}
.replay:hover { border-color: rgba(96, 165, 250, .55); background: rgba(96, 165, 250, .07); }

/* ---------- trust strip ---------- */

.trust { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust li {
  padding: 22px;
  border-left: 1px solid var(--hair);
  font: 500 12px/1.5 var(--mono);
  color: var(--text-soft);
}
.trust li:first-child { padding-left: 0; border-left: 0; }
.trust li:last-child { padding-right: 0; }

/* ---------- cards ---------- */

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 24px;
  transition: border-color .25s ease;
}
.card:hover { border-color: rgba(96, 165, 250, .36); }
.card__q { margin-top: 18px; font: 500 10.5px/1 var(--mono); letter-spacing: .12em; color: var(--dim); }
.card__quote { margin-top: 8px; font-size: 15.5px; font-weight: 600; line-height: 1.45; }
.evidence {
  margin-top: 16px;
  font: 500 12px/1.6 var(--mono);
  background: var(--surface-inset);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 11px 13px;
}
.evidence dt { font-size: 10.5px; letter-spacing: .1em; color: var(--dim); }
.evidence dd { margin: 0; color: var(--red); }
.card__verdict {
  margin-top: 14px;
  font: 600 11.5px/1 var(--mono);
  letter-spacing: .06em;
  color: var(--red);
}

/* ---------- pipeline ---------- */

.pipeline {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(7, 16, 29, .7);
  padding: 20px 22px;
}
.pipeline ol {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px 10px;
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .07em;
  color: var(--text-soft);
}
.pipeline li { border: 1px solid var(--border-strong); border-radius: 6px; padding: 10px 12px; text-align: center; }
.pipeline li.arrow { border: 0; padding: 0; color: var(--dim-2); }
.pipeline li.is-outcome {
  border-color: rgba(96, 165, 250, .45);
  background: rgba(96, 165, 250, .08);
  color: var(--blue-light);
}

/* ---------- layers ---------- */

.layers {
  margin-top: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(10, 18, 32, .45);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  overflow: hidden;
}
.layer { padding: 22px 20px; border-right: 1px solid var(--border); }
.layer:last-child { border-right: 0; background: rgba(96, 165, 250, .05); }
.layer summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  pointer-events: none;
}
.layer__title {
  font: 600 11.5px/1.3 var(--mono);
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--blue-light);
}
.layer__ind {
  display: none;
  font: 400 17px/1 var(--mono);
  color: var(--blue);
  transition: transform .25s ease;
}
.layer ul {
  margin-top: 14px;
  display: grid;
  gap: 7px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--muted);
}
.layer:last-child ul { color: var(--text-soft); }

/* ---------- audiences / services ---------- */

.audiences { margin-top: clamp(30px, 3.6vw, 44px); display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.audience {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
  padding: clamp(24px, 3vw, 38px);
  display: flex;
  flex-direction: column;
  transition: border-color .25s ease;
}
.audience:hover { border-color: rgba(96, 165, 250, .4); }
.audience--primary { border-color: rgba(96, 165, 250, .4); background: rgba(96, 165, 250, .045); }
.audience--primary:hover { border-color: rgba(96, 165, 250, .62); }
.audience__accent { position: absolute; top: 0; left: 22px; right: 22px; height: 2px; background: var(--blue); }
.audience__label {
  font: 600 11.5px/1.4 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--blue);
}
.audience__head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.badge {
  border: 1px solid rgba(96, 165, 250, .45);
  background: rgba(96, 165, 250, .1);
  border-radius: 5px;
  padding: 5px 8px;
  font: 600 10px/1 var(--mono);
  letter-spacing: .1em;
  color: var(--blue-light);
}
.audience h3 { margin-top: 16px; }
.audience p { margin-top: 14px; }
.audience__flowwrap { margin-top: auto; padding-top: 24px; }
.deliverables { margin-top: 14px; font: 500 11px/1.7 var(--mono); letter-spacing: .05em; color: var(--muted-2); }

.flow {
  background: var(--surface-inset);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  display: grid;
  gap: 9px;
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .08em;
}
.flow > * { text-align: center; }
.flow .node { border: 1px solid var(--border-strong); border-radius: 6px; padding: 11px; color: var(--text-soft); }
.flow .node--blue {
  border-color: rgba(96, 165, 250, .4);
  background: rgba(96, 165, 250, .07);
  color: var(--blue-light);
}
.flow .node--pass { border-color: rgba(52, 211, 153, .28); color: var(--green); }
.flow .node--fail { border-color: rgba(251, 113, 133, .32); color: var(--red); }
.flow .node--gate {
  border-color: rgba(251, 113, 133, .42);
  background: rgba(251, 113, 133, .06);
  color: var(--red);
}
.flow .node--final { color: var(--text); }
.flow .arrow { color: var(--dim-2); }
.flow .split { display: flex; gap: 9px; flex-wrap: wrap; }
.flow .split > * { flex: 1 1 110px; }

.extras {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  background: rgba(10, 18, 32, .3);
}
.extra { padding: clamp(20px, 2.4vw, 30px); border-right: 1px solid var(--border); }
.extra:last-child { border-right: 0; }
.extra__head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.extra h3 { font-size: 17px; font-weight: 700; letter-spacing: -.015em; }
.extra__kind { font: 500 10.5px/1 var(--mono); letter-spacing: .12em; color: var(--dim); }
.extra p { margin-top: 10px; font-size: 14.5px; line-height: 1.55; color: var(--muted); }

/* ---------- quality check ---------- */

.qc {
  border: 1px solid rgba(96, 165, 250, .34);
  border-radius: 16px;
  background: var(--surface);
  padding: clamp(26px, 3.6vw, 52px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(30px, 4vw, 52px);
  align-items: start;
}
.qc h2 { margin-top: 16px; font-size: clamp(29px, 3.6vw, 46px); line-height: 1.04; letter-spacing: -.04em; }
.qc__lead {
  margin-top: 16px;
  font-size: clamp(17px, 1.3vw, 20px);
  line-height: 1.5;
  color: var(--text-soft);
  max-width: 44ch;
}
.qc-list { margin-top: 28px; display: grid; gap: 8px; }
.qc-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  font: 500 12.5px/1 var(--mono);
  letter-spacing: .06em;
}
.qc-list .num { color: var(--blue); }
.qc-list .what { color: var(--text); }
.qc-list .why { margin-left: auto; font-size: 12px; letter-spacing: .02em; color: var(--dim); }
.qc-compact {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  font: 500 11.5px/1.3 var(--mono);
  letter-spacing: .05em;
}
.qc-compact li { border: 1px solid var(--border); border-radius: 8px; padding: 12px 11px; }
.qc-compact li:last-child { grid-column: span 2; }
.qc-compact .num { color: var(--blue); display: block; }
.qc-compact .what { color: var(--text); }
.qc__side { display: grid; gap: 14px; }

.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.tile {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(10, 18, 32, .8);
  padding: 17px;
}
.tile dt { font: 500 10.5px/1.4 var(--mono); letter-spacing: .14em; color: var(--muted-2); }
.tile dd { margin-top: 9px; font-size: 15.5px; font-weight: 600; }

/* ---------- sample report ---------- */

.sample { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(34px, 4.5vw, 60px); align-items: center; }
.synthetic {
  margin-top: 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(251, 191, 36, .34);
  background: rgba(251, 191, 36, .06);
  border-radius: 7px;
  padding: 11px 13px;
  font: 600 11.5px/1.4 var(--mono);
  letter-spacing: .05em;
  color: var(--yellow);
}
.metrics { margin-top: 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 11px; }
.metric { border: 1px solid var(--border); border-radius: 10px; padding: 15px; }
.metric dt { font: 500 10.5px/1.4 var(--mono); letter-spacing: .12em; color: var(--muted-2); }
.metric dd { margin-top: 9px; font-size: 25px; font-weight: 700; }
.metric--critical { border-color: rgba(251, 113, 133, .3); }
.metric--critical dd { color: var(--red); }
.metric--high { border-color: rgba(251, 191, 36, .28); }
.metric--high dd { color: var(--yellow); }
.metrics-line { margin-top: 18px; font: 500 12.5px/1.6 var(--mono); letter-spacing: .05em; color: var(--text-soft); }

.report {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 26px 80px rgba(0, 0, 0, .42);
  color: inherit;
  transition: transform .5s ease, border-color .3s ease;
}
.report:hover { transform: scale(1.012); border-color: rgba(96, 165, 250, .42); color: inherit; }
.report__head {
  padding: 13px 17px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: .11em;
  color: var(--muted-2);
}
.report__demo { color: var(--yellow); }
.report__body { padding: clamp(22px, 2.6vw, 32px); }
.report__scoreline {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.report__rate { margin-top: 8px; font-size: clamp(36px, 4vw, 50px); font-weight: 700; letter-spacing: -.03em; line-height: 1; }
.report__rate span { font-size: 22px; color: var(--muted-2); }
.report__denom { margin-top: 6px; font: 500 11.5px/1 var(--mono); letter-spacing: .06em; color: var(--dim); }
.report__counts { font: 600 11.5px/1.8 var(--mono); text-align: right; letter-spacing: .06em; }
.report__bar { margin-top: 20px; height: 5px; background: #111c2e; border-radius: 3px; overflow: hidden; }
.report__bar span { display: block; width: 78%; height: 100%; background: var(--blue); }
.report__gate {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font: 600 11px/1 var(--mono);
  letter-spacing: .1em;
  color: var(--red);
}
.finding {
  margin-top: 22px;
  border: 1px solid rgba(251, 113, 133, .3);
  background: rgba(251, 113, 133, .05);
  border-radius: 10px;
  padding: 18px;
}
.finding__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font: 600 10.5px/1.4 var(--mono);
  letter-spacing: .1em;
}
.finding h3 { margin-top: 12px; font-size: 16.5px; font-weight: 700; line-height: 1.35; }
.finding p { margin-top: 11px; font-size: 14px; line-height: 1.6; color: var(--muted); }
.report__caption {
  margin-top: 13px;
  font: 500 11px/1.5 var(--mono);
  letter-spacing: .05em;
  color: var(--dim);
  text-align: center;
}

/* ---------- founder ---------- */

.founder {
  margin-top: 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(10, 18, 32, .5);
  padding: clamp(22px, 2.8vw, 36px);
  display: flex;
  gap: clamp(20px, 3vw, 36px);
  align-items: flex-start;
  flex-wrap: wrap;
}
.founder__photo { flex-shrink: 0; }
.founder__photo img {
  width: 168px;
  height: 200px;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  object-fit: cover;
  object-position: 50% 18%;
  background: #0a1220;
}
.founder__body { flex: 1 1 320px; min-width: 0; }
.founder__body h2 { font-size: clamp(24px, 2.4vw, 32px); font-weight: 700; letter-spacing: -.03em; }
.founder__role {
  margin-top: 8px;
  font: 500 11.5px/1.4 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.founder__body p { margin-top: 14px; font-size: 15.5px; line-height: 1.62; max-width: 62ch; }
.founder__body p:first-of-type { color: var(--text-soft); margin-top: 18px; }
.founder__body .btn { margin-top: 20px; }

/* ---------- faq ---------- */

.faq { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(24px, 4vw, 60px); align-items: start; }
.faq__list { border-top: 1px solid var(--border); }
.faq__list details { border-bottom: 1px solid var(--border); padding: 20px 0; }
.faq__list summary {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.4;
  min-height: 44px;
  align-items: center;
}
.faq__list summary span:last-child {
  color: var(--blue);
  font: 400 18px/1 var(--mono);
  flex-shrink: 0;
  transition: transform .25s ease;
}
.faq__list details[open] summary span:last-child { transform: rotate(45deg); }
.faq__list p { margin-top: 13px; font-size: 15px; line-height: 1.65; color: var(--muted); max-width: 66ch; }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--hair); background: var(--bg-deep); padding: clamp(36px, 5vw, 60px) 0 30px; }
.site-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 30px; }
.site-footer__brand p:first-child { font-size: 16px; font-weight: 700; }
.site-footer__brand p:last-child {
  margin-top: 9px;
  font: 500 11px/1.6 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.site-footer nav { display: grid; gap: 9px; align-content: start; font-size: 14px; }
.site-footer nav p {
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dim);
}
.site-footer nav a { color: var(--muted); }
.site-footer nav a:hover { color: var(--text); }
.site-footer__bottom {
  max-width: var(--maxw);
  margin: 30px auto 0;
  padding: 22px var(--gutter) 0;
  border-top: 1px solid var(--hair);
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font: 500 11px/1.5 var(--mono);
  letter-spacing: .1em;
  color: var(--dim);
}

/* ---------- simple document page (privacy) ---------- */

.doc { padding: clamp(112px, 12vw, 150px) 0 clamp(56px, 7vw, 90px); }
.doc h1 { font-size: clamp(30px, 4vw, 46px); font-weight: 700; letter-spacing: -.035em; }
.doc h2 { margin-top: 40px; font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.doc p, .doc li { margin-top: 14px; font-size: 15.5px; line-height: 1.65; color: var(--muted); max-width: 74ch; }
.doc ul { margin-top: 6px; }
.doc li { padding-left: 18px; position: relative; }
.doc li::before { content: "·"; position: absolute; left: 4px; color: var(--blue); }
.doc__note {
  margin-top: 26px;
  border: 1px solid rgba(251, 191, 36, .34);
  background: rgba(251, 191, 36, .06);
  border-radius: 8px;
  padding: 16px 18px;
  font: 500 12.5px/1.6 var(--mono);
  letter-spacing: .03em;
  color: var(--yellow);
  max-width: 74ch;
}

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

.only-mobile { display: none; }

/* ---------- breakpoints ---------- */

@media (max-width: 1023px) {
  .hero__inner { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  /* visibility helpers first — component display rules below must be able to win */
  .only-mobile { display: block; }
  .only-desktop { display: none; }

  html { scroll-padding-top: 78px; }

  .site-nav { display: none; }
  .header__right { gap: 12px; }
  .lang__sep, .lang [aria-current] { display: none; }

  .hero { padding: 96px 0 40px; }
  .hero__inner { gap: 22px; }
  .h1 { font-size: 31px; line-height: 1.08; letter-spacing: -.028em; max-width: none; }
  .h2, .qc h2 { font-size: 24px; line-height: 1.14; letter-spacing: -.024em; max-width: none; }
  .h2--sm { font-size: 24px; }
  .lead, .hero__copy p.lead, .qc__lead { font-size: 16px; }
  .btn-row { flex-direction: column; align-items: stretch; }
  .btn-row .btn { width: 100%; }

  .section, .section--tight { padding: 48px 0; }

  .panel__head, .panel__body, .panel__foot { padding-left: 18px; padding-right: 18px; }
  .panel__body { padding-top: 18px; padding-bottom: 18px; }

  .trust { grid-template-columns: 1fr 1fr; }
  .trust li { border-left: 0; border-top: 1px solid var(--hair); padding: 15px 0; }
  .trust li:first-child { padding-left: 0; }

  .grid-3 { grid-template-columns: 1fr; }
  .card { padding: 20px; }

  .pipeline { padding: 20px; }
  .pipeline ol { flex-direction: column; align-items: stretch; }
  .pipeline li.arrow { transform: rotate(90deg); }

  .layers { display: block; background: none; border: 0; border-radius: 0; }
  .layer {
    padding: 0;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .layer:last-child { background: none; }
  .layer summary { padding: 16px 2px; pointer-events: auto; }
  .layer__ind { display: block; }
  .layer[open] .layer__ind { transform: rotate(45deg); }
  .layer ul { padding: 0 2px 18px; margin-top: 4px; }

  .audiences, .extras, .qc, .sample, .faq, .grid-2 { grid-template-columns: 1fr; }
  .audience, .qc, .founder { padding: 20px; }
  .extra { border-right: 0; border-bottom: 1px solid var(--border); padding: 20px; }
  .extra:last-child { border-bottom: 0; }
  .flow { padding: 18px 16px; }

  .qc-list { display: none; }
  .qc-compact { display: grid; }
  .tiles { gap: 8px; }
  .tile { padding: 13px; }

  .metrics { grid-template-columns: 1fr 1fr; gap: 8px; }
  .metric { padding: 13px; }

  .founder__photo img { width: 80px; height: 96px; border-radius: 8px; }
  .founder { gap: 18px; }
  .founder__body p { font-size: 15px; }

  .report__body { padding: 20px; }

  .site-footer__grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .site-footer__brand { grid-column: span 2; }
}

@media (max-width: 480px) {
  .brand__sub { display: none; }
  .brand__name { font-size: 14px; }
  .brand__mark { width: 30px; height: 30px; }
  .header-cta { padding: 12px 13px; font-size: 11px; }
  .header-cta .long { display: none; }
  .header-cta .short { display: inline; }
  .h1 { font-size: 29px; }
  .trow__who { width: 56px; }
  .trow__kv { grid-template-columns: 56px 1fr; }
  .qc-compact { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}


/* ---------- service landing: AI Regression Testing ---------- */
.service-hero {
  position: relative;
  padding: clamp(138px, 13vw, 190px) 0 clamp(72px, 8vw, 108px);
  overflow: hidden;
  border-bottom: 1px solid var(--hair);
  background-image: var(--grid-lines);
  background-size: 34px 34px;
}
.service-hero::before {
  content: '';
  position: absolute;
  width: 720px;
  height: 520px;
  right: -120px;
  top: -160px;
  background: radial-gradient(circle, rgba(37, 99, 235, .13), transparent 68%);
  pointer-events: none;
}
.service-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(420px, .97fr);
  gap: clamp(36px, 5vw, 76px);
  align-items: center;
}
.service-hero .h1 { max-width: 16ch; }
.service-hero .lead { max-width: 62ch; margin-top: 24px; }
.service-hero .btn-row { margin-top: 30px; }
.service-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 26px;
  font: 500 11px/1.5 var(--mono);
  letter-spacing: .045em;
  color: var(--muted-2);
}
.service-kicker span::before { content: '✓'; color: var(--green); margin-right: 7px; }

.reg-demo {
  position: relative;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: rgba(7, 16, 29, .94);
  overflow: hidden;
  box-shadow: 0 22px 60px rgba(0,0,0,.22);
}
.reg-demo__head {
  padding: 18px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}
.reg-demo__title { margin-top: 5px; font: 600 13px/1.35 var(--mono); color: var(--text); }
.demo-badge {
  display: inline-flex;
  padding: 6px 8px;
  border: 1px solid rgba(96,165,250,.28);
  background: rgba(96,165,250,.07);
  border-radius: 6px;
  color: var(--blue-light);
  font: 600 10px/1 var(--mono);
  letter-spacing: .1em;
}
.reg-demo__body { padding: 18px; display: grid; gap: 10px; }
.version-row {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: rgba(10,18,32,.72);
}
.version-row__label { font: 600 10.5px/1 var(--mono); letter-spacing: .08em; color: var(--muted); }
.version-row__name { font: 600 12px/1.3 var(--mono); color: var(--text-soft); }
.version-row__result { font: 700 10.5px/1 var(--mono); letter-spacing: .08em; }
.version-row__result.pass { color: var(--green); }
.version-row__result.fail { color: var(--red); }
.reg-finding {
  margin-top: 2px;
  padding: 15px 16px;
  border: 1px solid rgba(251,113,133,.36);
  background: rgba(251,113,133,.055);
  border-radius: 9px;
}
.reg-finding__grid {
  margin-top: 11px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.reg-chip {
  border: 1px solid var(--border);
  background: rgba(2,6,23,.48);
  border-radius: 7px;
  padding: 9px 10px;
}
.reg-chip span { display: block; font: 500 9.5px/1.2 var(--mono); letter-spacing: .1em; color: var(--muted-2); }
.reg-chip strong { display: block; margin-top: 5px; font: 650 11.5px/1.35 var(--mono); color: var(--text-soft); }
.reg-chip strong.fail { color: var(--red); }
.reg-gate {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background: #0d0a14;
  border: 1px solid rgba(251,113,133,.45);
  border-radius: 8px;
}
.reg-gate span { font: 500 9.5px/1 var(--mono); letter-spacing: .11em; color: var(--muted); }
.reg-gate strong { font: 700 11px/1 var(--mono); letter-spacing: .08em; color: var(--red); }

.problem-grid,
.change-grid,
.output-grid,
.fit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}
.service-card {
  border: 1px solid var(--border);
  background: rgba(7,16,29,.68);
  border-radius: 11px;
  padding: clamp(20px, 2.4vw, 28px);
}
.service-card h3 { margin-top: 9px; font-size: 19px; letter-spacing: -.02em; }
.service-card p { margin-top: 10px; }
.service-card ul { margin-top: 14px; display: grid; gap: 8px; }
.service-card li { position: relative; padding-left: 17px; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.service-card li::before { content: ''; position: absolute; left: 0; top: .68em; width: 6px; height: 1px; background: var(--blue); }

.change-grid { grid-template-columns: repeat(5, 1fr); }
.change-card { min-height: 178px; }
.change-card code { color: var(--blue-light); font: 600 12px/1.4 var(--mono); }
.change-card p { font-size: 14px; }

.method {
  margin-top: 38px;
  border-top: 1px solid var(--border);
}
.method-step {
  display: grid;
  grid-template-columns: 58px minmax(0, .75fr) minmax(0, 1.25fr);
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.method-step__no { font: 600 11px/1.4 var(--mono); color: var(--blue); letter-spacing: .12em; }
.method-step h3 { font-size: 18px; letter-spacing: -.015em; }
.method-step p { color: var(--muted); font-size: 15px; line-height: 1.6; }

.evidence-box {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  border: 1px solid var(--border-strong);
  border-radius: 13px;
  overflow: hidden;
  background: rgba(7,16,29,.74);
}
.evidence-box__copy { padding: clamp(24px, 3vw, 38px); }
.evidence-box__test { padding: clamp(20px, 2.4vw, 30px); background: #040a14; border-left: 1px solid var(--border); }
.trace { display: grid; gap: 8px; }
.trace-row { display: grid; grid-template-columns: 112px 1fr; gap: 12px; padding: 10px 11px; border: 1px solid var(--border); border-radius: 7px; }
.trace-row span { font: 500 9.5px/1.5 var(--mono); color: var(--muted-2); letter-spacing: .09em; }
.trace-row strong { font: 600 11.5px/1.5 var(--mono); color: var(--text-soft); }
.trace-row strong.pass { color: var(--green); }
.trace-row strong.fail { color: var(--red); }

.output-grid { grid-template-columns: repeat(3, 1fr); }
.output-card { min-height: 190px; }
.output-card .tlabel { color: var(--blue); }

.fit-grid { grid-template-columns: 1fr 1fr; }
.fit-card.good { border-color: rgba(52,211,153,.25); }
.fit-card.bad { border-color: rgba(148,163,184,.18); }
.fit-card.good .fit-title { color: var(--green); }
.fit-card.bad .fit-title { color: var(--muted); }
.fit-title { font: 600 10.5px/1 var(--mono); letter-spacing: .1em; }

.author-strip {
  display: grid;
  grid-template-columns: 92px 1fr auto;
  gap: 22px;
  align-items: center;
  padding: 22px;
  border: 1px solid var(--border);
  background: rgba(7,16,29,.7);
  border-radius: 12px;
}
.author-strip img { width: 92px; height: 108px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.author-strip h3 { font-size: 20px; }
.author-strip p { margin-top: 7px; max-width: 66ch; }

.breadcrumbs { margin-bottom: 28px; font: 500 10.5px/1.5 var(--mono); color: var(--muted-2); letter-spacing: .05em; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--blue-light); }
.breadcrumbs span { padding: 0 7px; color: var(--dim); }

.service-faq { max-width: 900px; }
.service-faq details { border-bottom: 1px solid var(--border); }
.service-faq summary { display:flex; justify-content:space-between; gap:16px; padding:20px 0; font-weight:650; }
.service-faq details p { padding: 0 28px 20px 0; color: var(--muted); line-height:1.65; }

@media (max-width: 1024px) {
  .service-hero__grid { grid-template-columns: 1fr; }
  .reg-demo { max-width: 760px; }
  .change-grid { grid-template-columns: repeat(3, 1fr); }
  .output-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .service-hero { padding-top: 116px; }
  .problem-grid, .change-grid, .output-grid, .fit-grid, .evidence-box { grid-template-columns: 1fr; }
  .change-card { min-height: 0; }
  .method-step { grid-template-columns: 42px 1fr; gap: 14px; }
  .method-step p { grid-column: 2; }
  .evidence-box__test { border-left: 0; border-top: 1px solid var(--border); }
  .author-strip { grid-template-columns: 80px 1fr; }
  .author-strip img { width: 80px; height: 94px; }
  .author-strip .btn { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .service-hero__grid { gap: 28px; }
  .service-hero .h1 { font-size: 34px; }
  .service-kicker { display: grid; gap: 7px; }
  .reg-demo__head { padding: 15px; }
  .reg-demo__body { padding: 13px; }
  .version-row { grid-template-columns: 72px 1fr; }
  .version-row__result { grid-column: 2; }
  .reg-finding__grid { grid-template-columns: 1fr; }
  .method-step { grid-template-columns: 32px 1fr; }
  .trace-row { grid-template-columns: 92px 1fr; }
}


/* ---------- knowledge hub / expert guides ---------- */
.guide-hero { padding: clamp(118px, 12vw, 160px) 0 54px; border-bottom: 1px solid var(--hair); background-image: var(--grid-lines); background-size: 34px 34px; }
.guide-hero .container { max-width: 1040px; }
.guide-kicker { display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-bottom:18px; }
.guide-meta { margin-top:22px; display:flex; gap:10px 18px; flex-wrap:wrap; font:500 11.5px/1.5 var(--mono); color:var(--muted-2); }
.guide-meta strong { color:var(--text-soft); font-weight:600; }
.guide-layout { max-width:1040px; margin:0 auto; padding:54px var(--gutter) 86px; display:grid; grid-template-columns:minmax(0,1fr) 250px; gap:56px; align-items:start; }
.article { max-width:760px; }
.article h2 { margin:46px 0 16px; font-size:clamp(25px,3vw,34px); line-height:1.15; letter-spacing:-.025em; }
.article h3 { margin:30px 0 12px; font-size:20px; line-height:1.25; }
.article p { margin:0 0 18px; color:var(--text-soft); line-height:1.75; }
.article ul, .article ol { margin:0 0 22px; padding-left:22px; color:var(--text-soft); }
.article ul { list-style:disc; }
.article ol { list-style:decimal; }
.article li { margin:8px 0; line-height:1.65; }
.article strong { color:var(--text); }
.article a { text-decoration:underline; text-decoration-color:rgba(147,197,253,.35); text-underline-offset:3px; }
.article-callout { margin:28px 0; padding:20px 22px; border:1px solid var(--border-strong); border-left:3px solid var(--blue); background:rgba(10,18,32,.7); border-radius:10px; }
.article-callout.fail { border-left-color:var(--red); }
.article-callout p:last-child { margin-bottom:0; }
.test-stack { margin:26px 0; display:grid; gap:8px; }
.test-stack__row { padding:12px 14px; border:1px solid var(--border); border-radius:8px; background:rgba(7,16,29,.8); display:grid; grid-template-columns:150px 1fr; gap:18px; font:500 12.5px/1.55 var(--mono); }
.test-stack__row span:first-child { color:#aeb9c9; letter-spacing:.06em; }
.test-stack__row .pass { color:var(--green); }
.test-stack__row .fail { color:var(--red); }
.toc { position:sticky; top:105px; border:1px solid var(--border); border-radius:10px; padding:18px; background:rgba(7,16,29,.72); }
.toc p { font:600 10.5px/1 var(--mono); letter-spacing:.14em; color:var(--blue); text-transform:uppercase; margin-bottom:13px; }
.toc a { display:block; color:var(--muted); font-size:13.5px; line-height:1.45; padding:6px 0; }
.toc a:hover { color:var(--text); }
.sources { margin-top:48px; padding-top:28px; border-top:1px solid var(--hair); }
.sources h2 { margin-top:0; font-size:23px; }
.source-list { display:grid; gap:10px; }
.source-list a { display:block; padding:12px 14px; border:1px solid var(--border); border-radius:8px; background:rgba(7,16,29,.55); text-decoration:none; }
.source-list small { display:block; color:var(--muted-2); margin-top:4px; }
.related-guides { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-top:22px; }
.guide-card { padding:20px; border:1px solid var(--border); border-radius:10px; background:rgba(7,16,29,.65); color:inherit; }
.guide-card:hover { border-color:rgba(96,165,250,.5); color:inherit; }
.guide-card .eyebrow { margin-bottom:10px; }
.guide-card h3 { font-size:18px; line-height:1.3; margin:0 0 9px; }
.guide-card p { color:var(--muted); font-size:14px; line-height:1.55; }
.knowledge-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-top:32px; }
.knowledge-grid .guide-card { min-height:230px; display:flex; flex-direction:column; }
.knowledge-grid .guide-card .guide-link { margin-top:auto; padding-top:18px; font:600 12px/1 var(--mono); color:var(--blue-light); }
.theory-note { margin-top:18px; color:var(--muted-2); font-size:13px; line-height:1.65; }

/* Accessibility patch for the technical test panel. */
.panel .tlabel, .panel__meta dt, .trow__who, .trow__kv dt { color:#aeb9c9; }
.qbadge__hint { color:#a7b2c2; }

@media (max-width:900px) {
  .guide-layout { grid-template-columns:1fr; padding-top:38px; }
  .toc { position:static; order:-1; }
  .related-guides, .knowledge-grid { grid-template-columns:1fr; }
  .test-stack__row { grid-template-columns:110px 1fr; }
}
@media (max-width:480px) {
  .guide-hero { padding-top:102px; }
  .guide-layout { padding-left:18px; padding-right:18px; }
  .test-stack__row { grid-template-columns:1fr; gap:5px; }
}