/* ============================================================
   Technical Binder — stylesheet
   Edit design tokens in :root. Everything else derives from them.

   Shared brand system — same four hues as Pit Scout
   (../crispy-doodle/style.css), each tuned for its own theme rather
   than copy-pasted, since a hue that reads well on a dark surface
   often can't pass text contrast on a light one:
     navy   structural anchor. Pit Scout (dark): backgrounds. Here
            (light): body ink — the same hue anchors both ends of the
            light/dark spectrum, just inverted.
     teal   primary interactive accent in both — "this is active /
            selected / yours". Pit Scout also uses it for the
            highlight-team color; here it's nav state, pills, links.
     gold   Pit Scout's primary accent (reads fine on dark surfaces);
            here it's decorative-only (text selection, a hover glow) —
            gold text fails contrast against a light background.
     orange secondary/metadata accent in both — status tags there,
            auxiliary labels (carousel/iteration tags) here. Never
            used for warnings — see --warn below.
   Errors get a dedicated red in both apps, deliberately outside the
   brand hues, so a real error never reads as just another accent.
   ============================================================ */

/* ---- 1. Tokens ------------------------------------------- */

:root {
  --paper:    #fafaf8;          /* near-white, just a hair off pure white */
  --panel:    #ffffff;
  --ink:      #20222f;          /* navy-black, tinted from the logo's navy */
  --ink-2:    #4a4e63;
  --ink-3:    #5f6278;
  --rule:     #e6e6e2;
  --rule-2:   #eeeeeb;
  --accent:   #0a7770;          /* team teal — overridden at runtime by team.accent */
  --accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --accent-2: #204a72;          /* team navy — secondary accent, used sparingly */
  --accent-3: #b8420e;          /* team orange — metadata/tag labels only */
  --pop:      #f0b90b;          /* team gold — decorative fills/highlights only, not text */
  --pop-ink:  #3a2c05;          /* dark text color for use on --pop fills */
  --warn:     #b73528;          /* error/warning red — deliberately not a brand hue */

  --font-display: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --font-body:    "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 68ch;
  --gutter: clamp(20px, 5vw, 72px);
  --nav-h: 58px;

  color-scheme: light;
}

/* ---- 2. Reset -------------------------------------------- */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.05; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

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

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--paper); padding: 10px 16px;
  font-family: var(--font-mono); font-size: 12px;
}
.skip:focus { left: 8px; top: 8px; }

.wrap { max-width: 1240px; margin: 0 auto; padding-inline: var(--gutter); }

/* Shared type helpers */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.muted { color: var(--ink-2); }
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--rule-2);
  padding: 0.1em 0.36em;
  border-radius: 3px;
}

/* ---- 3. Navigation --------------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--rule);
}
.nav-in { height: 100%; display: flex; align-items: center; gap: 24px; }

.wordmark {
  display: flex; align-items: baseline; gap: 10px;
  text-decoration: none; flex: none;
}
.wordmark-mark { width: 26px; height: 26px; align-self: center; flex: none; }
.wordmark-a { font-family: var(--font-display); font-weight: 400; font-size: 17px; letter-spacing: 0.06em; }
.wordmark-b { font-family: var(--font-display); font-weight: 800; font-size: 17px; letter-spacing: 0.02em; }
.wordmark-tag {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-3);
  padding-left: 10px; border-left: 1px solid var(--rule);
}
.wordmark-tag b { color: var(--accent-2); font-weight: 500; }

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  font-size: 13px; text-decoration: none; color: var(--ink-2);
  padding: 6px 11px; border-radius: 4px;
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: var(--rule-2); }
.nav-links a.is-active { color: var(--ink); }
.nav-links a.is-active::after {
  content: ""; display: block; height: 1.5px; background: var(--accent);
  margin-top: 3px; border-radius: 2px;
}

.nav-tools { display: flex; align-items: center; gap: 6px; flex: none; }
.icon-btn {
  width: 32px; height: 32px; display: grid; place-items: center;
  background: none; border: 1px solid transparent; border-radius: 5px;
  cursor: pointer; color: var(--ink-2);
}
.icon-btn:hover { border-color: var(--rule); color: var(--ink); }
.icon-btn svg { width: 15px; height: 15px; }

/* Contents button: opens the full section list (menu-panel). Shown at every
   width — on wide screens it sits alongside the category links, on narrow
   ones it's the only way to jump to a section since nav-links hides. */
.nav-menu-btn {
  width: auto; padding: 0 12px 0 9px; gap: 7px;
  display: flex; align-items: center;
}
.nav-menu-btn svg { flex: none; }
.nav-menu-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: inherit;
}
@media (max-width: 500px) { .nav-menu-label { display: none; } .nav-menu-btn { width: 32px; padding: 0; } }

@media (max-width: 940px) {
  .nav-links { display: none; }
  .wordmark-tag { display: none; }
}

/* Slide-down section menu (mobile) */
.menu-panel {
  position: fixed; inset: var(--nav-h) 0 auto 0; z-index: 99;
  background: var(--panel); border-bottom: 1px solid var(--rule);
  max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  padding: 12px var(--gutter) 24px;
}
.menu-panel[hidden] { display: none !important; }
.menu-group { font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); margin: 16px 0 6px; }
.menu-panel a { display: flex; gap: 12px; padding: 9px 0; text-decoration: none; border-bottom: 1px solid var(--rule-2); font-size: 15px; }
.menu-panel a span:first-child { font-family: var(--font-mono); color: var(--accent); font-size: 12px; padding-top: 3px; }

/* ---- 4. Hero --------------------------------------------- */

.hero { padding: clamp(40px, 7vw, 88px) 0 clamp(24px, 4vw, 56px); }
.hero-meta { text-align: center; }
.hero-title {
  font-size: clamp(2.4rem, 8.5vw, 6.75rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  /* letter-spacing above tightens every character gap, including the one
     around the space — word-spacing adds it back just at word breaks. */
  word-spacing: 0.3em;
  line-height: 0.86;
  margin: 14px 0 0;
  font-style: italic;
}
.hero-sub {
  max-width: 46ch; margin: 22px auto 0;
  color: var(--ink-2); font-size: clamp(15px, 1.6vw, 18px);
}

.hero .wrap { max-width: 1460px; }
.hero-meta { max-width: 1240px; margin-inline: auto; }

.hero-stage {
  position: relative;
  margin-top: clamp(28px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(0, 2.7fr) minmax(160px, 1fr);
  gap: clamp(12px, 2.5vw, 40px);
  align-items: center;
}
.hero-figure { grid-column: 2; position: relative; aspect-ratio: var(--ar, 4 / 3); }
.hero-frame {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: contain; opacity: 0; transition: opacity .28s ease;
  pointer-events: none; /* only the visible frame below should catch clicks */
}
.hero-frame.is-on { opacity: 1; pointer-events: auto; cursor: zoom-in; }
@media (prefers-reduced-motion: reduce) { .hero-frame { transition: none; } }

.hero-lines {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; overflow: visible; z-index: 1;
}
.hero-lines path { fill: none; stroke: var(--ink-3); stroke-width: 1; opacity: .5; }

.hero-dot {
  position: absolute; width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px;
  border-radius: 50%; background: var(--paper);
  border: 1.5px solid var(--accent); z-index: 3; pointer-events: none;
  transition: transform .2s, box-shadow .2s;
}
.hero-dot.is-lit {
  transform: scale(1.45);
  border-color: var(--pop);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--pop) 22%, transparent);
}

.hero-rail { display: flex; flex-direction: column; gap: clamp(14px, 3vw, 30px); z-index: 2; }
.hero-rail-l { grid-column: 1; text-align: right; align-items: flex-end; }
.hero-rail-r { grid-column: 3; text-align: left; align-items: flex-start; }

.callout { text-decoration: none; display: block; max-width: 230px; }
.callout-name {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink);
  display: block; margin-bottom: 4px;
  transition: color .15s;
}
.callout-blurb { font-size: 12.5px; line-height: 1.45; color: var(--ink-3); }
.callout:hover .callout-name { color: var(--accent); }

@media (max-width: 900px) {
  /* Just the image — no leader lines (nothing for them to point at) and no
     label rail. Highlighting a system is a hover behavior on the rail
     labels, so it isn't reachable here; visitors just get the full robot. */
  .hero-stage { display: flex; flex-direction: column; }
  .hero-lines, .hero-dot, .hero-rail { display: none; }
  /* Every .hero-frame is position:absolute (for the crossfade), so
     .hero-figure has no in-flow content to size itself from — it needs an
     explicit width here, since this flex column doesn't stretch its items
     to fill the cross axis (.hero-stage sets align-items: center above).
     Without this the figure collapses to 0×0 and the image vanishes. */
  .hero-figure { width: 100%; }
}

/* ---- 6. Sections ----------------------------------------- */

.sec { padding: clamp(32px, 5vw, 64px) 0; border-top: 1px solid var(--rule); }
.sec-title {
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  font-weight: 800; letter-spacing: -0.04em;
  margin: 10px 0 0;
}
.sec-thesis { margin-top: 16px; font-size: clamp(16px, 1.8vw, 19px); color: var(--ink-2); max-width: 56ch; }

/* Primary row: title + thesis + Features beside the section's main image
   (or compare view). In the HTML the text comes first — so it still reads
   before the image on narrow screens, and for screen readers regardless of
   width, since they follow DOM order rather than `order` below — and
   `order` is what puts the image on the left once there's room for two
   columns. Falls back to a single column when there's only one child. */
.sec-primary {
  display: grid; grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 32px);
  align-items: start;
}

.sec-primary > .sec-text { order: 1; }
.sec-primary > .media-block { order: 2; }
@media (min-width: 861px) {
  /* Image column is explicitly the big track (1.8fr) and text is
     explicitly the small track (.8fr) — pinned with grid-column so the
     `order` swap below (which moves the image to visually the left)
     can never again flip which element lands in which track. */
  .sec-primary { grid-template-columns: minmax(0, 1.8fr) minmax(0, .8fr); }
  .sec-primary:has(> :only-child) { grid-template-columns: 1fr; }

  .sec-primary > .media-block {
    grid-column: 1; order: 1;
    /* Pins the image (and its pills/caption) while Features scrolls past
       beside it. Only travels as far as the row is tall — on a section
       where the image is taller than the text there's nothing to pin
       against, so it just behaves like a normal static image. */
    position: sticky;
    top: calc(var(--nav-h) + 24px);
  }
  .sec-primary > .sec-text { grid-column: 2; order: 2; }
}

.sec-primary .media-block { margin-top: 0; }
.sec-primary .features { margin-top: clamp(20px, 3vw, 32px); max-width: none; }
.sec-text { min-width: 0; }

.sec-media { margin-top: clamp(26px, 4vw, 44px); display: flex; flex-direction: column; gap: clamp(30px, 4vw, 52px); }
.media-block { min-width: 0; }

figure { margin: 0; }
figcaption {
  margin-top: 10px; font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .06em; color: var(--ink-3);
}
.frame {
  background: none; border: none;
  border-radius: 3px; overflow: hidden;
}
.frame img { width: 100%; cursor: zoom-in; transition: opacity .15s ease; }
.frame img:hover { opacity: .88; }

.video-frame {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  border-radius: 3px; overflow: hidden; background: var(--ink-4, #111);
}
.video-frame iframe {
  position: absolute; inset: 0; width: 100%; height: 100%; border: 0;
}

.features { margin-top: clamp(30px, 4vw, 52px); max-width: var(--measure); }

.block-label {
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase; color: var(--ink-3);
  padding-bottom: 8px; border-bottom: 1px solid var(--rule); margin-bottom: 14px;
}

/* Feature list */
.feat > li {
  padding: 11px 0 11px 22px; position: relative;
  border-bottom: 1px solid var(--rule-2);
  font-size: 15.5px;
}
.feat > li::before {
  content: ""; position: absolute; left: 0; top: 21px;
  width: 9px; height: 1.5px; background: var(--accent);
}
.feat ul { margin: 8px 0 0; }
.feat ul li {
  position: relative; padding: 4px 0 4px 18px;
  font-size: 14px; color: var(--ink-2); line-height: 1.5;
}
.feat ul li::before {
  content: ""; position: absolute; left: 2px; top: 12px;
  width: 4px; height: 4px; border-radius: 50%;
  border: 1px solid var(--ink-3);
}

/* ---- 7. Compare slider ----------------------------------- */

.compare-stage {
  position: relative; overflow: hidden; user-select: none;
  background: none; border: none; border-radius: 3px;
}
.compare-stage > img { width: 100%; display: block; }
.compare-top {
  position: absolute; inset: 0;
  clip-path: inset(0 calc(100% - var(--pos, 50%)) 0 0);
  background: var(--paper); /* opaque backstop so a transparent "before" image can't reveal the "after" image stacked beneath it */
}
.compare-top img { width: 100%; height: 100%; object-fit: cover; }

.compare-bar {
  position: absolute; top: 0; bottom: 0; left: var(--pos, 50%);
  width: 2px; background: var(--accent-2); pointer-events: none; z-index: 3;
  transform: translateX(-1px);
}
.compare-grip {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--accent-2); color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 13px; line-height: 1;
  box-shadow: 0 2px 12px rgba(0,0,0,.28);
}
.compare-range {
  position: absolute; inset: 0; width: 100%; height: 100%;
  margin: 0; opacity: 0; cursor: ew-resize; z-index: 4;
  -webkit-appearance: none; appearance: none; background: none;
}
.compare-range::-webkit-slider-thumb { -webkit-appearance: none; width: 44px; height: 100%; }

/* On a touch device the hit target is a band that follows the divider
   (touch-action: none only within that band) rather than the full image —
   so a finger landing anywhere else on the image scrolls the page as
   normal, and only a touch that starts near the handle grabs it. A mouse
   or trackpad has no scroll-vs-drag conflict, so it keeps the full-width
   "click anywhere to jump" hit target above. */
@media (pointer: coarse) {
  .compare-range {
    left: calc(var(--pos, 50%) - 32px); width: 64px;
    touch-action: none;
  }
}
.compare-range::-moz-range-thumb { width: 44px; height: 100%; border: 0; opacity: 0; }

.compare-tag {
  position: absolute; bottom: 12px; z-index: 3; pointer-events: none;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(6px);
  border: 1px solid var(--rule);
  padding: 5px 9px; border-radius: 3px;
}
.compare-tag-l { left: 12px; }
.compare-tag-r { right: 12px; }

/* ---- 8. Iteration scrubber ------------------------------- */

.iters-stage {
  position: relative; background: none;
  border: none; border-radius: 3px; overflow: hidden;
}
.iters-stage { aspect-ratio: var(--ar, 4 / 3); }
.iters-stage img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: contain; padding: 3%;
}
.iter-frame { opacity: 0; transition: opacity .18s ease; pointer-events: none; }
.iter-frame.is-on { opacity: 1; pointer-events: auto; cursor: zoom-in; }
.iter-frame.is-on:hover { opacity: .92; }
@media (prefers-reduced-motion: reduce) { .iter-frame { transition: none; } }

.iter-badge {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: .1em; color: #fff; background: var(--accent-3);
  padding: 4px 9px; border-radius: 3px;
}

.iters-ctl { margin-top: 14px; display: flex; align-items: center; gap: 12px; }
.step-btn {
  width: 30px; height: 30px; flex: none; border: 1px solid var(--rule);
  background: var(--panel); border-radius: 4px; cursor: pointer;
  display: grid; place-items: center; color: var(--ink-2);
}
.step-btn:hover:not(:disabled) { border-color: var(--accent-2); color: var(--accent-2); }
.step-btn:disabled { opacity: .35; cursor: default; }

.iter-range {
  flex: 1; -webkit-appearance: none; appearance: none;
  background: none; height: 28px; cursor: pointer; margin: 0;
}
.iter-range::-webkit-slider-runnable-track { height: 2px; background: var(--rule); }
.iter-range::-moz-range-track { height: 2px; background: var(--rule); }
.iter-range::-webkit-slider-thumb {
  -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid var(--paper); margin-top: -6.5px;
  box-shadow: 0 0 0 1px var(--accent-2);
}
.iter-range::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent-2);
}

.iter-note {
  margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--rule-2);
  display: flex; gap: 12px; align-items: baseline;
  font-size: 14.5px; color: var(--ink-2); min-height: 3.2em;
}
.iter-note b {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--accent-3); flex: none; text-transform: uppercase;
}

/* ---- 8b. Figure grids ------------------------------------ */

.figs { display: grid; gap: clamp(12px, 1.8vw, 20px); }
.figs-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.figs-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.figs .wide { grid-column: 1 / -1; }
@media (max-width: 720px) { .figs-2, .figs-3 { grid-template-columns: 1fr; } }

.figs figure { display: flex; flex-direction: column; }
.figs .frame { flex: 1; display: grid; place-items: center; padding: 10px; }
.figs .frame img { width: 100%; height: auto; }

/* ---- 8c. Highlight views ---------------------------------- */

.hl-stage {
  position: relative; overflow: hidden;
  background: none; border: none; border-radius: 3px;
  aspect-ratio: var(--ar, 4 / 3);
}
.hl-stage img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: contain; padding: 3%;
  opacity: 0; transition: opacity .28s ease;
  pointer-events: none; /* only the visible frame below should catch clicks */
}
.hl-stage img.is-on { opacity: 1; pointer-events: auto; cursor: zoom-in; }
.hl-stage img.is-on:hover { opacity: .92; }
@media (prefers-reduced-motion: reduce) { .hl-stage img { transition: none; } }

.hl-pills {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 12px;
}
.pill {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 500;
  letter-spacing: .12em; text-transform: uppercase;
  padding: 7px 13px; cursor: pointer;
  background: var(--panel); color: var(--ink-2);
  border: 1px solid var(--rule); border-radius: 100px;
  transition: color .15s, border-color .15s, background .15s;
}
.pill:hover { color: var(--ink); border-color: var(--ink-3); }
.pill[aria-selected="true"] {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

/* ---- 8d. Carousel (Prototyping + Alternate Views) --------- */

/* Multiple items show side by side — as many as fit — and the arrows page
   the strip sideways. Each item's frame is a FIXED height, not matched to
   that image's aspect ratio, so mixed portrait/landscape photos sit flush
   in a row instead of resizing the row around whichever one is showing. */
.carousel { position: relative; }

.carousel-track {
  display: flex; gap: 14px;
  overflow-x: auto; scroll-snap-type: x mandatory;
  scroll-padding-left: 2px;
  scrollbar-width: none;
}
.carousel-track::-webkit-scrollbar { display: none; }
.carousel.is-single .carousel-track { overflow-x: visible; }

.carousel-item {
  flex: 0 0 clamp(200px, 27vw, 300px); scroll-snap-align: start;
  min-width: 0;
}
.carousel.is-single .carousel-item { flex-basis: min(100%, 420px); }

.carousel-frame {
  height: clamp(190px, 20vw, 260px);
  background: none; border: none; border-radius: 3px;
  display: grid; place-items: center; overflow: hidden;
}
.carousel-frame img {
  width: 100%; height: 100%; object-fit: contain; padding: 6%;
  cursor: zoom-in; transition: opacity .15s ease;
}
.carousel-frame img:hover { opacity: .88; }

.carousel-cap { margin-top: 9px; font-size: 13.5px; color: var(--ink-2); line-height: 1.4; }
.carousel-cap b {
  display: block;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: var(--accent-3);
  margin-bottom: 2px;
}

.carousel-nav {
  position: absolute; top: calc(clamp(190px, 20vw, 260px) / 2); z-index: 2;
  transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(4px);
  border: 1px solid var(--rule); color: var(--ink-2);
  display: grid; place-items: center; cursor: pointer;
  transition: color .15s, border-color .15s, opacity .15s;
}
.carousel-nav:hover { color: var(--accent-2); border-color: var(--accent-2); }
.carousel-nav:disabled { opacity: 0; pointer-events: none; }
.carousel-prev { left: -14px; }
.carousel-next { right: -14px; }
@media (max-width: 640px) { .carousel-prev { left: 4px; } .carousel-next { right: 4px; } }

/* ---- 9. Card grid (software tools etc.) ------------------ */

.cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
}
.card {
  background: var(--panel); border: 1px solid var(--rule);
  border-radius: 3px; overflow: hidden; text-decoration: none;
  display: flex; flex-direction: column;
  transition: border-color .15s, transform .15s;
}
a.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card img { width: 100%; background: var(--panel); border-bottom: 1px solid var(--rule); }
.card-body { padding: 15px 16px 18px; }
.card h4 { font-size: 17px; font-weight: 600; }
.card p { margin-top: 6px; font-size: 13.5px; color: var(--ink-3); line-height: 1.5; }
.card-go { margin-top: 10px; font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }

/* ---- 9b. Lightbox ------------------------------------------ */

/* One overlay, reused for every clickable image on the page (see
   wireLightbox in binder.js). Sits above the nav (z-index 100). */
.lightbox {
  position: fixed; inset: 0; z-index: 500;
  display: grid; place-items: center; padding: clamp(20px, 5vw, 64px);
  background: rgba(8, 8, 9, .86); backdrop-filter: blur(3px);
  opacity: 0; transition: opacity .18s ease;
  cursor: zoom-out;
  /* Tied to is-open (not [hidden]) so the fading-out overlay releases
     clicks the instant closing starts, not ~180ms later once the fade
     finishes and JS finally sets [hidden]. */
  pointer-events: none;
}
.lightbox.is-open { opacity: 1; pointer-events: auto; }
.lightbox[hidden] { display: none; }
@media (prefers-reduced-motion: reduce) { .lightbox { transition: none; } }

.lightbox figure {
  margin: 0; max-width: 100%; max-height: 100%;
  display: flex; flex-direction: column; align-items: center;
  transform: scale(.97); transition: transform .18s ease;
}
.lightbox.is-open figure { transform: scale(1); }
@media (prefers-reduced-motion: reduce) { .lightbox figure { transition: none; } }

.lightbox img {
  max-width: 100%; max-height: 78vh; object-fit: contain;
  border-radius: 4px; box-shadow: 0 24px 64px rgba(0, 0, 0, .45);
  cursor: default;
}

.lightbox figcaption {
  margin-top: 16px; max-width: 62ch; text-align: center;
  font-size: 14px; line-height: 1.5; color: #e8e7e3;
}
.lightbox figcaption:empty { display: none; }
.lightbox figcaption b {
  display: block;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: #fff;
  margin-bottom: 4px;
}

.lightbox-close {
  position: fixed; top: clamp(14px, 3vw, 28px); right: clamp(14px, 3vw, 28px);
  z-index: 1;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .2);
  color: #fff; display: grid; place-items: center; cursor: pointer;
  transition: background .15s, border-color .15s;
}
.lightbox-close:hover { background: rgba(255, 255, 255, .16); border-color: rgba(255, 255, 255, .4); }

/* ---- 9b. Sponsors ------------------------------------------ */

.sponsors {
  border-top: 1px solid var(--rule);
  padding: 48px 0 32px;
  text-align: center;
}
.sponsors-label {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3);
  margin-bottom: 28px;
}
.sponsors-row {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 36px 48px;
}
.sponsor-logo {
  height: 44px; max-width: 160px;
  width: auto; object-fit: contain;
  filter: grayscale(1) opacity(.7);
  transition: filter .15s;
}
.sponsor-logo:hover { filter: none; }

.sponsors-hero {
  border-top: none; padding: 32px 0 0; margin-top: 8px;
}
.sponsors-hero .sponsor-logo { height: 32px; max-width: 120px; }

/* ---- 10. Footer ------------------------------------------ */

.foot {
  border-top: 1px solid var(--rule);
  padding: 40px 0 56px;
  display: flex; flex-wrap: wrap; gap: 16px 32px;
  align-items: baseline; justify-content: space-between;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3);
}
.foot a { color: var(--ink-3); }
.foot a:hover { color: var(--accent); }

/* ---- 11. Error banner ------------------------------------ */

.boom {
  margin: 40px auto; max-width: 640px; padding: 20px 24px;
  border: 1px solid var(--warn); border-left-width: 3px;
  background: var(--panel); font-family: var(--font-mono); font-size: 13px;
}
.boom h2 { font-family: var(--font-mono); font-size: 13px; margin-bottom: 8px; color: var(--warn); }

/* ---- 12. Print ------------------------------------------- */

@media print {
  :root { --paper: #fff; --ink: #000; --ink-2: #333; --ink-3: #666; --rule: #bbb; --rule-2: #ddd; }
  .nav, .menu-panel, .iters-ctl, .compare-range, .compare-bar, .skip, .lightbox { display: none !important; }
  body { font-size: 10.5pt; }
  .sec { padding: 18pt 0; break-inside: avoid; break-before: page; }
  .hero { padding: 0 0 18pt; }
  .hero-title { font-size: 42pt; }
  a { text-decoration: none; }
  .iter-frame { opacity: 1 !important; position: static !important; }
}