/* ==========================================================================
   Code — Omni Code for vibe coders (owner: studio-code agent)
   Hero "Split lab" · error ticker · the wall · paste-an-error band · learn while it fixes · the whole stack · FAQ
   Every selector is scoped with .code-… ; logical properties only (RTL-safe).
   Loops animate transform/opacity only and pause offscreen (.is-playing, toggled by js/pages/code.js).
   ========================================================================== */

.page-code {
  /* Raw error messages: the only non-brand hue on the page (foundation's semantic --danger). */
  --code-err: var(--danger);
  --code-err-soft: color-mix(in srgb, var(--code-err) 70%, var(--text));
  /* One gap between sections instead of two paddings added together (≈200px at 1440). */
  --code-pad-top: calc(var(--section-y) * 0.62);
  --code-pad-bottom: calc(var(--section-y) * 0.55);
  --steps-gap: clamp(18px, 2.2vw, 32px);
}

/* Serif italic descenders (p, y, g) in split headings: room for the gradient box and its clip mask. */
.page-code :is(h1, h2) .accent { padding-block-end: 0.16em; }
.page-code .is-split .accent span:has(> .split-word) { padding-block-end: 0.3em; margin-block-end: -0.3em; }
.page-code .is-split .accent .split-word { padding-block-end: 0.26em; margin-block-end: -0.26em; }

/* ---------------------------------------------------------------- Hero (split lab) */
.code-hero {
  position: relative;
  isolation: isolate;
  overflow-x: clip;
  overflow-y: visible; /* the gold glow fades into the ticker instead of ending on a hard edge */
  padding-block: calc(var(--header-h) + clamp(40px, 6vw, 96px)) clamp(56px, 6vw, 88px);
}
.code-hero__grid {
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 72% 40%, #000 5%, transparent 72%);
  mask-image: radial-gradient(ellipse 70% 60% at 72% 40%, #000 5%, transparent 72%);
  opacity: 0.6;
}
.code-hero__orb--a { width: min(720px, 90vw); aspect-ratio: 1; inset-block-start: -120px; inset-inline-end: -160px; opacity: 0.55; }
.code-hero__orb--b { width: min(380px, 64vw); aspect-ratio: 1; inset-block-end: -40px; inset-inline-start: 26%; opacity: 0.22; }

.code-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: clamp(36px, 5vw, 84px);
  align-items: center;
}
.code-hero__copy { display: flex; flex-direction: column; align-items: flex-start; gap: clamp(18px, 2vw, 26px); }
.code-hero__title { font-size: clamp(42px, 5.5vw, 84px); }
.code-hero__lead { max-width: 44ch; }
.code-hero__actions { --cluster-gap: 12px; }

/* Three promises as a spec row: icon over label, hairline-separated columns. */
ul.code-proof {
  align-self: stretch;
  list-style: none;
  margin: 6px 0 0;
  padding: 22px 0 0;
  display: flex;
  border-block-start: 1px solid var(--line);
}
.code-proof li {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding-inline: clamp(14px, 1.6vw, 22px);
  border-inline-start: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-2);
}
.code-proof li:first-child { padding-inline-start: 0; border-inline-start: 0; }
.code-proof .icon { width: 18px; height: 18px; color: var(--gold-2); }

/* Lab frame around the terminal demo */
.code-hero__lab { position: relative; min-width: 0; }
.code-lab {
  position: relative;
  padding: clamp(8px, 1vw, 12px);
  border-radius: calc(var(--radius-l) + 6px);
  border: 1px solid var(--glass-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--ice) 6%, transparent), color-mix(in srgb, var(--ice) 1.5%, transparent)),
    var(--glass);
  box-shadow: var(--shadow-2), 0 0 140px -40px color-mix(in srgb, var(--blue) 70%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}
.code-lab::before,
.code-lab::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border-color: color-mix(in srgb, var(--gold-2) 55%, transparent);
  border-style: solid;
  border-width: 0;
  pointer-events: none;
}
.code-lab::before { inset-block-start: -12px; inset-inline-start: -12px; border-block-start-width: 1px; border-inline-start-width: 1px; }
.code-lab::after { inset-block-end: -12px; inset-inline-end: -12px; border-block-end-width: 1px; border-inline-end-width: 1px; }
.code-lab__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 6px 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
}
[dir="rtl"] .code-lab__head { letter-spacing: 0.02em; }
.code-lab__label { display: inline-flex; align-items: center; gap: 9px; color: var(--gold-2); }
.code-lab__rec { width: 7px; height: 7px; border-radius: 50%; background: var(--gold-2); box-shadow: 0 0 10px var(--gold-2); }
.code-lab__stage { position: relative; display: grid; min-height: clamp(320px, 36vw, 500px); }
.code-lab__stage > * { min-width: 0; }

/* The terminal demo (demos agent) sized for this frame: shorter screens on narrow viewports, and a capped,
   scrollable finished session when it does not animate (reduced motion / no JS). */
@media (max-width: 900px) {
  .code-lab .demo-terminal { --term-h: clamp(320px, 58vw, 440px); }
}
@media (max-width: 640px) {
  .code-lab .demo-terminal { --term-h: clamp(290px, 84vw, 360px); }
  .code-lab__stage { min-height: 0; }
}
.no-js .code-lab .demo-terminal__screen {
  max-height: min(64vh, 520px);
  overflow-y: auto;
  padding-block-end: 40px;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
  -webkit-mask-image: linear-gradient(180deg, #000 calc(100% - 36px), transparent);
  mask-image: linear-gradient(180deg, #000 calc(100% - 36px), transparent);
}
@media (prefers-reduced-motion: reduce) {
  .code-lab .demo-terminal__screen {
    max-height: min(64vh, 520px);
    overflow-y: auto;
    padding-block-end: 40px;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
    -webkit-mask-image: linear-gradient(180deg, #000 calc(100% - 36px), transparent);
    mask-image: linear-gradient(180deg, #000 calc(100% - 36px), transparent);
  }
}
@media (max-width: 640px) {
  .no-js .code-lab .demo-terminal__screen { max-height: min(50vh, 400px); }
}
@media (max-width: 640px) and (prefers-reduced-motion: reduce) {
  .code-lab .demo-terminal__screen { max-height: min(50vh, 400px); }
}

/* Static session (shown only when the terminal demo is unavailable) */
.code-session { display: flex; flex-direction: column; }
.code-session__body { flex: 1; display: flex; flex-direction: column; gap: 14px; padding: clamp(16px, 1.8vw, 22px); font-size: 13.5px; }
.code-session__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-3); }
.code-session__error {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--code-err) 32%, transparent);
  background: color-mix(in srgb, var(--code-err) 7%, transparent);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--code-err-soft);
}
.code-session__error > p:first-child { display: flex; align-items: flex-start; gap: 10px; }
.code-session__error .icon { width: 16px; height: 16px; margin-block-start: 1px; color: var(--code-err); }
.code-session__trace { margin-block-start: 4px; padding-inline-start: 26px; color: var(--text-3); }
ol.code-session__log { list-style: none; margin: 0; padding: 0; display: grid; }
.code-session__log li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  padding-block: 10px;
  border-block-end: 1px dashed var(--line);
}
.code-session__agent { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ice); padding-block-start: 2px; }
.code-session__log li:nth-child(2) .code-session__agent { color: var(--gold-2); }
.code-session__text { color: var(--text-2); }
.code-session__log li:nth-child(2) .code-session__text { color: var(--text); }
.code-session__done {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-block-start: auto;
  padding-block: 7px;
  padding-inline: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--gold-2) 35%, transparent);
  background: color-mix(in srgb, var(--gold) 10%, transparent);
  font-size: 13px;
  color: var(--gold-3);
}
.code-session__done .icon { width: 15px; height: 15px; color: var(--gold-2); stroke-width: 2; }

/* ---------------------------------------------------------------- Error ticker (full-bleed band) */
.code-ticker {
  position: relative;
  padding-block: clamp(14px, 1.6vw, 20px);
  border-block: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent, color-mix(in srgb, var(--code-err) 4%, transparent) 30%, color-mix(in srgb, var(--gold) 4%, transparent) 70%, transparent),
    color-mix(in srgb, var(--bg-1) 72%, transparent);
  overflow: hidden;
}
.code-ticker__marquee { --gap: clamp(22px, 2.4vw, 34px); }
.code-ticker__track { list-style: none; margin: 0; padding: 0; align-items: center; }
.code-ticker__item { display: flex; align-items: center; gap: 14px; white-space: nowrap; }
.code-ticker__err {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--code-err-soft);
}
.code-ticker__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--code-err); box-shadow: 0 0 8px var(--code-err); }
.code-ticker__arrow { width: 16px; height: 16px; color: var(--text-3); }
.code-ticker__plain {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(17px, 1.4vw, 20px);
  letter-spacing: -0.005em;
  color: var(--gold-2);
}
:lang(ar) .code-ticker__plain, :lang(zh-Hans) .code-ticker__plain { font-family: var(--font-sans); font-style: normal; font-size: 15px; }
.code-ticker__star { width: 12px; height: 12px; margin-inline-start: 8px; color: var(--text-3); opacity: 0.7; }

/* ---------------------------------------------------------------- The wall */
.code-wall { padding-block: var(--code-pad-top) var(--code-pad-bottom); }
ul.code-wall__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 1.6vw, 22px);
  align-items: start;
}
.code-wall__grid > li:nth-child(3n + 2) { margin-block-start: clamp(28px, 4vw, 60px); }
.code-err {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-l);
  border: 1px solid var(--glass-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--ice) 5%, transparent), color-mix(in srgb, var(--ice) 1%, transparent)),
    var(--glass);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  isolation: isolate;
  transition: border-color var(--dur) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.code-err:hover { border-color: color-mix(in srgb, var(--gold-2) 30%, transparent); }
.code-err__says {
  padding: 20px 22px 18px;
  border-block-end: 1px solid var(--line);
  background:
    repeating-linear-gradient(180deg, transparent 0 3px, color-mix(in srgb, var(--ice) 2.5%, transparent) 3px 4px),
    color-mix(in srgb, var(--bg-0) 55%, transparent);
}
.code-err__top {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.code-err__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--code-err); box-shadow: 0 0 10px var(--code-err); }
.code-err__tag { color: var(--code-err); }
.code-err__kicker { margin-inline-start: auto; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.code-err__raw {
  margin-block-start: 14px;
  min-height: 4.8em;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--code-err-soft);
  overflow-wrap: anywhere;
  transition: opacity var(--dur) var(--ease-out);
}
.code-err__raw code, .code-how__paste code { padding: 0; background: none; color: inherit; font-size: inherit; }
.code-err__means { display: flex; flex-direction: column; gap: 12px; padding: 20px 22px 24px; flex: 1; }
.code-err__kicker--gold { margin: 0; display: inline-flex; align-items: center; gap: 8px; color: var(--gold-2); }
.code-err__arrow { width: 14px; height: 14px; rotate: 90deg; }
.code-err__plain {
  font-size: clamp(19px, 1.65vw, 23px);
  font-weight: 350;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text);
  text-wrap: balance;
}
.code-err__fix { margin-block-start: 6px; padding-block-start: 14px; border-block-start: 1px dashed var(--line); font-size: 14px; line-height: 1.5; color: var(--text-2); }
.code-err__fix-label { display: block; margin-block-end: 5px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.code-err:hover .code-err__raw { opacity: 0.55; }
[dir="rtl"] .code-err__top, [dir="rtl"] .code-err__kicker, [dir="rtl"] .code-err__fix-label { letter-spacing: 0.02em; }

/* ---------------------------------------------------------------- Paste an error → 5 steps (full-bleed band) */
.code-how {
  position: relative;
  isolation: isolate;
  overflow: clip;
  padding-block: calc(var(--section-y) * 0.72);
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-1), color-mix(in srgb, var(--bg-1) 80%, var(--bg-2)) 50%, var(--bg-1));
}
.code-how::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(circle, color-mix(in srgb, var(--ice) 11%, transparent) 1px, transparent 1.6px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 55%, #000 10%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 55%, #000 10%, transparent 75%);
  opacity: 0.55;
  pointer-events: none;
}
.code-how__glow {
  position: absolute;
  inset-block-start: -35%;
  inset-inline: 15%;
  height: 75%;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--blue) 24%, transparent), transparent);
  pointer-events: none;
}
.code-how__head {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: end;
  margin-block-end: clamp(56px, 7vw, 96px);
}
.code-how__head .section-head { margin-block-end: 0; }
.code-how__in {
  padding: 18px 20px;
  border-radius: var(--radius-m);
  border: 1px solid color-mix(in srgb, var(--code-err) 28%, transparent);
  background: color-mix(in srgb, var(--code-err) 5%, var(--bg-0));
  box-shadow: var(--shadow-1);
}
.code-how__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
}
[dir="rtl"] .code-how__label { letter-spacing: 0.02em; }
.code-how__label .icon { width: 15px; height: 15px; }
.code-how__label--gold { color: var(--gold-2); }
.code-how__label--gold .icon { fill: currentColor; stroke-width: 1; }
.code-how__paste { margin-block-start: 10px; font-family: var(--font-mono); font-size: 13.5px; line-height: 1.55; color: var(--code-err-soft); overflow-wrap: anywhere; }
.code-how__caret { display: inline-block; width: 8px; height: 1.1em; margin-inline-start: 4px; vertical-align: -0.2em; border-radius: 1px; background: var(--gold-2); }

ol.code-steps {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--steps-gap);
}
/* Rail: a hairline flows in from the band's edge and ends on the last node; the lit rail joins 01 → 05. */
.code-steps::before,
.code-steps::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset-block-start: 22px;
  inset-inline-end: calc((100% - 4 * var(--steps-gap)) / 5 - 22px);
  height: 1px;
}
.code-steps::before {
  inset-inline-start: calc(50% - 50vw);
  background: linear-gradient(90deg, transparent, var(--line-strong) 18%);
}
[dir="rtl"] .code-steps::before { background: linear-gradient(270deg, transparent, var(--line-strong) 18%); }
.code-steps::after {
  inset-inline-start: 22px;
  height: 2px;
  margin-block-start: -0.5px;
  background: linear-gradient(90deg, var(--blue-2), var(--ice) 45%, var(--gold-2));
  box-shadow: 0 0 12px color-mix(in srgb, var(--gold-2) 50%, transparent);
  transform-origin: 0 50%;
  transition: transform 2.6s var(--ease-in-out) 0.2s;
}
[dir="rtl"] .code-steps::after { transform-origin: 100% 50%; background: linear-gradient(270deg, var(--blue-2), var(--ice) 45%, var(--gold-2)); }
.js .code-steps:not(.is-in)::after { transform: scaleX(0); }
.code-step { position: relative; z-index: 1; display: flex; flex-direction: column; gap: 10px; }
.code-step__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-block-end: 14px;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--gold-2) 45%, transparent);
  background: var(--bg-2);
  box-shadow: 0 0 0 7px var(--bg-1);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold-2);
}
.code-step:last-child .code-step__node { border-color: transparent; background: var(--grad-gold); color: var(--bg-0); box-shadow: 0 0 0 7px var(--bg-1), var(--glow-gold); }
.code-step__owner { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ice); }
[dir="rtl"] .code-step__owner { letter-spacing: 0.02em; }
.code-step__title { font-size: clamp(22px, 2vw, 28px); font-weight: 300; line-height: 1.1; letter-spacing: -0.025em; color: var(--text); }
.code-step__text { font-size: 15px; line-height: 1.55; color: var(--text-2); text-wrap: pretty; }

.code-how__out {
  max-width: 580px;
  margin-block-start: clamp(48px, 6vw, 80px);
  margin-inline-start: auto;
  padding: 20px 24px;
  border-radius: var(--radius-m);
  border: 1px solid color-mix(in srgb, var(--gold-2) 32%, transparent);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--gold) 12%, transparent), transparent 60%),
    var(--glass);
  box-shadow: var(--shadow-1), 0 30px 80px -40px color-mix(in srgb, var(--gold) 55%, transparent);
}
.code-how__result { margin-block-start: 8px; font-size: 18px; line-height: 1.45; color: var(--text); }

/* ---------------------------------------------------------------- Learn while it fixes */
.code-learn { padding-block: var(--code-pad-top) var(--code-pad-bottom); overflow-x: clip; }
.code-learn__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
}
.code-learn__copy .section-head { margin-block-end: clamp(28px, 3.6vw, 44px); }
ul.code-points { list-style: none; margin: 0; padding: 0; border-block-start: 1px solid var(--line); }
.code-point { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 18px; padding-block: 20px; border-block-end: 1px solid var(--line); }
.code-point__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  color: var(--gold-2);
  border: 1px solid color-mix(in srgb, var(--gold-2) 24%, transparent);
  background: linear-gradient(180deg, color-mix(in srgb, var(--gold) 15%, transparent), color-mix(in srgb, var(--gold) 3%, transparent));
}
.code-point__icon .icon { width: 21px; height: 21px; }
.code-point__title { font-size: 18px; font-weight: 450; line-height: 1.3; letter-spacing: -0.01em; color: var(--text); }
.code-point__text { margin-block-start: 4px; font-size: 15px; color: var(--text-2); }

.code-learn__visual { position: relative; }
.code-learn__visual::before {
  content: "";
  position: absolute;
  inset-block: 10% -8%;
  inset-inline: 12% 0;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--blue) 45%, transparent), transparent);
  filter: blur(40px);
  pointer-events: none;
}
.code-explain { font-size: 14px; }
.code-explain__diff { padding-block: 14px; border-block-end: 1px solid var(--line); font-family: var(--font-mono); font-size: 13px; overflow: hidden; }
.code-explain__ln { display: grid; grid-template-columns: 40px 20px max-content; line-height: 2.2; white-space: pre; color: var(--text-2); }
.code-explain__ln em { font-style: normal; text-align: end; padding-inline-end: 12px; color: var(--text-3); opacity: 0.6; }
.code-explain__ln i { font-style: normal; }
.code-explain__ln b { font-weight: inherit; }
.code-explain__ln .k { color: var(--blue-2); }
.code-explain__ln .n { color: var(--gold-2); }
.code-explain__ln--del { background: color-mix(in srgb, var(--code-err) 7%, transparent); }
.code-explain__ln--del i { color: var(--code-err); }
.code-explain__ln--del > span { color: var(--text-3); text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--code-err) 60%, transparent); }
.code-explain__ln--add { background: color-mix(in srgb, var(--gold) 10%, transparent); box-shadow: inset 2px 0 0 var(--gold-2); }
.code-explain__ln--add i { color: var(--gold-2); }
.code-explain__ln--add > span { color: var(--text); }
.code-explain__why { padding: 20px 22px 8px; }
.code-explain__row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.code-explain__label { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gold-2); }
[dir="rtl"] .code-explain__label { letter-spacing: 0.02em; }
.code-explain__label .icon { width: 14px; height: 14px; fill: currentColor; stroke-width: 1; }
.code-explain__levels:not([hidden]) {
  display: inline-flex;
  padding: 3px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--bg-0) 55%, transparent);
}
.code-explain__level {
  min-height: 32px;
  padding-inline: 12px;
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  color: var(--text-3);
  transition: background-color var(--dur) var(--ease-out), color var(--dur);
}
.code-explain__level:hover { color: var(--text); }
.code-explain__level[aria-checked="true"] { color: var(--text); background: color-mix(in srgb, var(--ice) 12%, transparent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ice) 18%, transparent); }
.code-explain__level:focus-visible { outline-offset: 1px; border-radius: var(--radius-pill); }
.code-explain__texts { margin-block-start: 14px; min-height: 6.6em; }
.code-explain__text { font-size: 16px; line-height: 1.6; color: var(--text); text-wrap: pretty; }
.code-explain__text.is-entering { animation: code-fade-in 480ms var(--ease-out); }
/* Illustrative footer (decorative, aria-hidden): reads as the choices you get, not as buttons. */
.code-explain__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 6px 22px 0;
  padding-block: 14px 18px;
  border-block-start: 1px dashed var(--line);
  font-size: 13px;
  color: var(--text-3);
}
.code-explain__await { margin-inline-end: 4px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; }
[dir="rtl"] .code-explain__await { letter-spacing: 0.02em; }
.code-explain__act { display: inline-flex; align-items: center; gap: 6px; }
.code-explain__act + .code-explain__act::before { content: ""; width: 3px; height: 3px; margin-inline-end: 8px; border-radius: 50%; background: var(--line-strong); }
.code-explain__act .icon { width: 14px; height: 14px; stroke-width: 2; }
.code-explain__act--main { color: var(--gold-2); }

/* ---------------------------------------------------------------- The whole stack */
.code-stack { padding-block: var(--code-pad-top) var(--code-pad-bottom); }
.code-layers-wrap { position: relative; max-width: 1100px; margin-inline: auto; }
ol.code-layers {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  border-block-start: 1px solid var(--line);
}
/* Side rail with a light travelling down it: the light is a gradient band inside a clipped rail,
   moved with transform only. */
.code-layers__rail {
  position: absolute;
  inset-block: 0;
  inset-inline-start: 10.5px;
  width: 3px;
  overflow: hidden;
  pointer-events: none;
}
.code-layers__rail::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 1px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong) 8%, var(--line-strong) 92%, transparent);
}
.code-layers__rail i {
  position: absolute;
  inset: 0;
  border-radius: 3px;
  background: linear-gradient(180deg, transparent, var(--gold-2), transparent) no-repeat 0 0 / 100% 90px;
  transform: translateY(-90px);
  opacity: 0;
}
.code-layer {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: 24px 40px 46px minmax(0, 1fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding-block: clamp(20px, 2.4vw, 30px);
  padding-inline-end: clamp(8px, 1.4vw, 20px);
  border-block-end: 1px solid var(--line);
}
.code-layer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, color-mix(in srgb, var(--gold) 7%, transparent), transparent 55%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease-out);
}
[dir="rtl"] .code-layer::before { background: linear-gradient(270deg, color-mix(in srgb, var(--gold) 7%, transparent), transparent 55%); }
.code-layer:hover::before { opacity: 1; }
.code-layer__node {
  justify-self: center;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--bg-0);
  transition: background-color var(--dur) var(--ease-out), box-shadow var(--dur), border-color var(--dur);
}
.code-layer:hover .code-layer__node { border-color: var(--gold-2); background: var(--gold-2); box-shadow: 0 0 12px var(--gold-2); }
.code-layer__idx { font-size: 12px; letter-spacing: 0.1em; color: var(--text-3); }
.code-layer__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--ice);
  transition: color var(--dur) var(--ease-out), border-color var(--dur);
}
.code-layer__icon .icon { width: 20px; height: 20px; }
.code-layer:hover .code-layer__icon { color: var(--gold-2); border-color: color-mix(in srgb, var(--gold-2) 40%, transparent); }
.code-layer__name { font-size: clamp(26px, 2.8vw, 40px); font-weight: 300; line-height: 1.05; letter-spacing: -0.035em; color: var(--text); }
.code-layer__text { margin-block-start: 6px; font-size: 15px; color: var(--text-2); }
ul.code-layer__chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }

/* ---------------------------------------------------------------- FAQ */
.code-faq { padding-block: var(--code-pad-top) var(--code-pad-bottom); }
.code-faq__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "head list"
    "more list";
  column-gap: clamp(40px, 6vw, 96px);
  row-gap: 28px;
  align-items: start;
}
.code-faq__head { grid-area: head; }
.code-faq__head .section-head { margin-block-end: 0; }
.code-faq__list { grid-area: list; }
.code-faq__more {
  grid-area: more;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding-block-start: 22px;
  border-block-start: 1px solid var(--line);
  color: var(--text-3);
}
.code-faq__list summary > span { flex: 1; }
.code-faq__list .faq__answer p { color: var(--text-2); }

/* Closing band follows the FAQ with one gap, not two. */
.page-code .cta-band { padding-block-start: var(--code-pad-top); }

/* ---------------------------------------------------------------- Motion (never under reduced motion) */
@media (prefers-reduced-motion: no-preference) {
  .code-lab__rec { animation: code-pulse 1.6s ease-in-out infinite; }
  .code-session__log li { animation: code-log 10s var(--ease-out) infinite backwards; animation-delay: calc(0.8s + var(--i) * 1.1s); }
  .code-session__done { animation: code-log 10s var(--ease-out) infinite backwards; animation-delay: 5.4s; }
  .code-how__caret { animation: code-blink 1s steps(2, jump-none) infinite; }
  .code-layers__rail i { animation: code-travel 6s var(--ease-in-out) infinite; }
}
/* Offscreen (or hidden tab): loops hold still. Without JS they simply run. */
.js .code-lab:not(.is-playing) *,
.js .code-lab:not(.is-playing) *::before,
.js .code-lab:not(.is-playing) *::after,
.js .code-how__in:not(.is-playing) *,
.js .code-layers-wrap:not(.is-playing) * { animation-play-state: paused !important; }

@keyframes code-pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.4; transform: scale(0.8); } }
@keyframes code-log {
  0% { opacity: 0; transform: translateY(8px); }
  5%, 88% { opacity: 1; transform: none; }
  96%, 100% { opacity: 0; transform: none; }
}
@keyframes code-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
@keyframes code-travel {
  0% { transform: translateY(-90px); opacity: 0; }
  10%, 85% { opacity: 1; }
  100% { transform: translateY(100%); opacity: 0; }
}
@keyframes code-fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------------------------------------------------------------- Responsive */
@media (max-width: 1180px) {
  .code-layer { grid-template-columns: 24px 40px 46px minmax(0, 1fr) minmax(0, 1fr); }
}

@media (max-width: 1040px) {
  ul.code-wall__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .code-wall__grid > li:nth-child(3n + 2) { margin-block-start: 0; }
  .code-wall__grid > li:nth-child(2n) { margin-block-start: clamp(24px, 4vw, 48px); }

  /* Steps go vertical: each step draws the connector down to the next node, so the rail ends on 05. */
  ol.code-steps { grid-template-columns: minmax(0, 1fr); gap: 0; max-width: 720px; }
  .code-steps::before, .code-steps::after { display: none; }
  .code-step {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: clamp(18px, 3vw, 28px);
    row-gap: 6px;
    padding-block-end: clamp(28px, 4vw, 40px);
  }
  .code-step:not(:last-child)::after {
    content: "";
    position: absolute;
    z-index: 0;
    inset-block: 44px 0;
    inset-inline-start: 21.5px;
    width: 1px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--gold-2) 60%, transparent), var(--line-strong));
  }
  .code-step:last-child { padding-block-end: 0; }
  .code-step__node { grid-row: 1 / span 3; margin: 0; }
  .code-step__owner { padding-block-start: 4px; }
  .code-how__out { margin-inline-start: 0; }

  .code-layer { grid-template-columns: 24px 46px minmax(0, 1fr); row-gap: 14px; }
  .code-layer__idx { display: none; }
  ul.code-layer__chips { grid-column: 3; justify-content: flex-start; }
}

@media (max-width: 900px) {
  .code-hero__inner { grid-template-columns: minmax(0, 1fr); }
  .code-hero__title { font-size: clamp(42px, 9vw, 76px); }
  .code-how__head { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .code-learn__grid { grid-template-columns: minmax(0, 1fr); }
  .code-faq__grid {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: none;
    grid-template-areas: "head" "list" "more";
    row-gap: 32px;
  }
}

@media (max-width: 640px) {
  ul.code-wall__grid { grid-template-columns: minmax(0, 1fr); }
  .code-wall__grid > li:nth-child(2n) { margin-block-start: 0; }
  .code-err__raw { min-height: 0; }
  ul.code-proof { flex-direction: column; gap: 12px; }
  .code-proof li { flex-direction: row; align-items: center; padding-inline: 0; border-inline-start: 0; }
  .code-lab__meta { display: none; }
  .code-lab::before, .code-lab::after { display: none; }
  .code-session__log li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .code-explain__why { padding-inline: 16px; }
  .code-explain__actions { margin-inline: 16px; }
  .code-explain__await { flex-basis: 100%; }
  .code-explain__diff { font-size: 11.5px; }
  .code-explain__ln { grid-template-columns: 30px 16px max-content; }
  .code-explain__levels:not([hidden]) { width: 100%; }
  .code-explain__level { flex: 1; padding-inline: 8px; }
  .code-layer { grid-template-columns: 24px minmax(0, 1fr); }
  .code-layer__icon { display: none; }
  ul.code-layer__chips { grid-column: 2; }
  .code-faq__list summary { padding: 18px; font-size: 16px; }
  .code-faq__list .faq__answer { padding: 0 18px 18px; }
}

@media (max-width: 420px) {
  .code-hero__actions { width: 100%; }
  .code-hero__actions .btn { flex: 1 1 auto; }
}