/* ==========================================================================
   ContextClosest — design system
   Concept: a precision search instrument. Cool "lab paper" neutrals, ink,
   one cobalt accent for retrieval, saffron for live/new signals, moss for
   cache hits. Light and dark themes share the same token names.
   Type: Bricolage Grotesque (display) · IBM Plex Sans (text) · IBM Plex Mono (data).
   ========================================================================== */

:root {
  --paper:        #ECEEE8;
  --paper-2:      #E3E6DF;
  --sheet:        #F8F9F5;
  --photo:        #FFFFFF;
  --ink:          #141A17;
  --ink-2:        #4B5650;
  --ink-3:        #7C8780;
  --rule:         #D2D7CE;
  --rule-strong:  #B9C0B6;
  --cobalt:       #2340D9;
  --cobalt-ink:   #FFFFFF;
  --cobalt-soft:  #DCE2FA;
  --saffron:      #E89A10;
  --saffron-soft: #FBEAC5;
  --saffron-ink:  #6B4300;
  --moss:         #2D7A55;
  --moss-soft:    #D5EBDF;
  --danger:       #B3261E;
  --dot-grid:     rgba(20, 26, 23, 0.09);
  --shadow:       0 1px 2px rgba(20, 26, 23, 0.06), 0 8px 24px -12px rgba(20, 26, 23, 0.18);
  --tech-redis-bg:  #FBE0DD; --tech-redis-ink:  #A1251B;
  --tech-ml-bg:     #DCE7FB; --tech-ml-ink:     #1D4F9E;
  --tech-qdrant-bg: #ECE3FB; --tech-qdrant-ink: #5A2DB0;
  --tech-spark-bg:  #FDE6D8; --tech-spark-ink:  #A9420E;
  --tech-kafka-bg:  #E4E5EA; --tech-kafka-ink:  #23252B;

  --font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --font-text:    "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "Cascadia Code", Consolas, monospace;

  --radius:    12px;
  --radius-lg: 18px;
  --page:      1200px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:        #0E1311;
    --paper-2:      #121815;
    --sheet:        #161D1A;
    --photo:        #F3F4F1;
    --ink:          #E8EBE5;
    --ink-2:        #A3ADA6;
    --ink-3:        #6F7A73;
    --rule:         #26302B;
    --rule-strong:  #36423C;
    --cobalt:       #7088FF;
    --cobalt-ink:   #0B1030;
    --cobalt-soft:  #1A2448;
    --saffron:      #F3B53C;
    --saffron-soft: #3A2D10;
    --saffron-ink:  #FBD58A;
    --moss:         #5BC28F;
    --moss-soft:    #143325;
    --danger:       #F2867D;
    --dot-grid:     rgba(232, 235, 229, 0.07);
    --shadow:       0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px -14px rgba(0, 0, 0, 0.7);
    --tech-redis-bg:  #3A1915; --tech-redis-ink:  #F4A097;
    --tech-ml-bg:     #172848; --tech-ml-ink:     #9DBCF5;
    --tech-qdrant-bg: #261A44; --tech-qdrant-ink: #C2A8F5;
    --tech-spark-bg:  #3A2112; --tech-spark-ink:  #F5AE83;
    --tech-kafka-bg:  #252A28; --tech-kafka-ink:  #D3D8D4;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper:        #0E1311;
  --paper-2:      #121815;
  --sheet:        #161D1A;
  --photo:        #F3F4F1;
  --ink:          #E8EBE5;
  --ink-2:        #A3ADA6;
  --ink-3:        #6F7A73;
  --rule:         #26302B;
  --rule-strong:  #36423C;
  --cobalt:       #7088FF;
  --cobalt-ink:   #0B1030;
  --cobalt-soft:  #1A2448;
  --saffron:      #F3B53C;
  --saffron-soft: #3A2D10;
  --saffron-ink:  #FBD58A;
  --moss:         #5BC28F;
  --moss-soft:    #143325;
  --danger:       #F2867D;
  --dot-grid:     rgba(232, 235, 229, 0.07);
  --shadow:       0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px -14px rgba(0, 0, 0, 0.7);
  --tech-redis-bg:  #3A1915; --tech-redis-ink:  #F4A097;
  --tech-ml-bg:     #172848; --tech-ml-ink:     #9DBCF5;
  --tech-qdrant-bg: #261A44; --tech-qdrant-ink: #C2A8F5;
  --tech-spark-bg:  #3A2112; --tech-spark-ink:  #F5AE83;
  --tech-kafka-bg:  #252A28; --tech-kafka-ink:  #D3D8D4;
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
a { color: inherit; }

.mono { font-family: var(--font-mono); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 10;
  background: var(--ink); color: var(--paper);
  padding: 8px 14px; border-radius: 8px; text-decoration: none;
}
.skip-link:focus { top: 12px; }

:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 2px; }

main, .topbar, .footer {
  width: 100%;
  max-width: var(--page);
  margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

/* ── Top bar ──────────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-mark { width: 32px; height: 32px; flex: none; }
.brand-mark-bg { fill: var(--cobalt); }
.brand-mark-lines line { stroke: var(--cobalt-ink); stroke-width: 1.6; opacity: 0.7; }
.brand-mark-dot { fill: var(--cobalt-ink); }
.brand-mark-query { fill: var(--saffron); }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
}
.brand-name span { color: var(--cobalt); }

.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.topnav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.15s, background 0.15s;
}
.topnav a:hover { color: var(--ink); background: var(--paper-2); }
.topnav-gh svg { width: 15px; height: 15px; fill: currentColor; }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-left: 6px;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  background: var(--sheet);
  cursor: pointer;
  transition: border-color 0.15s;
}
.theme-toggle:hover { border-color: var(--ink-3); }
.theme-toggle svg {
  width: 17px; height: 17px;
  fill: none; stroke: var(--ink); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-moon { display: block; }
}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  align-items: stretch;
  padding-block: 40px 28px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.eyebrow-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--saffron);
  box-shadow: 0 0 0 4px var(--saffron-soft);
}

.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.5rem, 5.4vw, 4.4rem);
  line-height: 1.0;
  letter-spacing: -0.024em;
  text-wrap: balance;
}
.hero-title em {
  font-style: normal;
  color: var(--cobalt);
  text-decoration: underline;
  text-decoration-color: var(--saffron);
  text-decoration-thickness: 0.075em;
  text-underline-offset: 0.1em;
  text-decoration-skip-ink: none;
}

.lede {
  margin: 0;
  max-width: 54ch;
  font-size: 17.5px;
  color: var(--ink-2);
}

/* Search box */
.search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 64px;
  padding: 8px 8px 8px 18px;
  background: var(--sheet);
  border: 1.5px solid var(--rule-strong);
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search:focus-within {
  border-color: var(--cobalt);
  box-shadow: 0 0 0 4px var(--cobalt-soft), var(--shadow);
}
.search-icon {
  width: 21px; height: 21px; flex: none;
  fill: none; stroke: var(--ink-3); stroke-width: 2; stroke-linecap: round;
}
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: 500 17px/1.3 var(--font-text);
}
.search input::placeholder { color: var(--ink-3); font-weight: 400; }
.search input::-webkit-search-cancel-button { cursor: pointer; }

.kbd {
  flex: none;
  min-width: 26px;
  padding: 2px 7px;
  border: 1px solid var(--rule-strong);
  border-bottom-width: 2px;
  border-radius: 6px;
  font: 500 12.5px/1.4 var(--font-mono);
  color: var(--ink-3);
  text-align: center;
}
.search:focus-within .kbd { display: none; }

.search-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 11px;
  background: var(--cobalt);
  color: var(--cobalt-ink);
  font-weight: 600;
  font-size: 15.5px;
  cursor: pointer;
  transition: transform 0.12s, filter 0.15s;
}
.search-btn:hover { filter: brightness(1.08); }
.search-btn:active { transform: translateY(1px); }
.search-btn:disabled { cursor: progress; filter: saturate(0.6); }
.btn-arrow {
  width: 17px; height: 17px;
  fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round;
  transition: transform 0.15s;
}
.search-btn:hover .btn-arrow { transform: translateX(2px); }
.search-btn.loading .btn-arrow { animation: nudge 0.9s ease-in-out infinite; }

/* Example + trending rows */
.examples, .trending {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.trending[hidden] { display: none; }
.trending-pills { display: flex; flex-wrap: wrap; gap: 8px; }

.row-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-right: 4px;
  font: 500 12.5px var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.live-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--saffron);
  animation: pulse 2s ease-in-out infinite;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: transparent;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}
.chip:hover { border-color: var(--cobalt); color: var(--cobalt); background: var(--cobalt-soft); }
.chip-count {
  min-width: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--saffron-soft);
  color: var(--saffron-ink);
  font: 600 12px/18px var(--font-mono);
  text-align: center;
}

/* Embedding-space panel */
.field-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle, var(--dot-grid) 1px, transparent 1.2px) 0 0 / 18px 18px,
    var(--sheet);
  overflow: hidden;
}
.field-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px 0;
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.field-k { color: var(--ink-2); }
#field {
  display: block;
  flex: 1;
  width: 100%;
  min-height: 300px;
}
.field-caption {
  padding: 0 18px 16px;
  font-size: 13.5px;
  color: var(--ink-2);
}
.field-caption strong { color: var(--ink); font-weight: 600; }

/* ── Spec strip ───────────────────────────────────────────────────────── */
.specs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 36px;
}
.spec {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 18px 18px 18px 0;
}
.spec + .spec { padding-left: 18px; border-left: 1px solid var(--rule); }
.spec-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.spec-label { font-size: 13.5px; color: var(--ink-2); }

/* ── Results ──────────────────────────────────────────────────────────── */
.results { min-height: 120px; }

.trace {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: 20px;
  font-size: 15px;
}
.trace[hidden] { display: none; }
.trace-summary strong { font-weight: 600; }
.trace-path {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font: 500 12.5px var(--font-mono);
}
.trace-step {
  padding: 3px 9px;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  color: var(--ink-2);
  background: var(--sheet);
}
.trace-step.hit { border-color: transparent; background: var(--moss-soft); color: var(--moss); font-weight: 600; }
.trace-step.miss { color: var(--ink-3); }
.trace-arrow { color: var(--ink-3); }
.trace-time {
  margin-left: auto;
  font: 600 13px var(--font-mono);
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: 18px;
}

.card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--sheet);
  overflow: hidden;
  animation: rise 0.45s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}
.card:hover {
  border-color: var(--rule-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.card-photo {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--photo);
  border-bottom: 1px solid var(--rule);
}
.card-photo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 18px;
  object-fit: contain;
  mix-blend-mode: multiply;          /* white photo backgrounds melt into the tile */
  transition: transform 0.3s ease;
}
.card:hover .card-photo img { transform: scale(1.04); }
.card-photo-fallback {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  color: #9AA39D;
}
.card-photo-fallback svg { width: 44px; height: 44px; fill: none; stroke: currentColor; stroke-width: 1.4; }

.card-rank {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(20, 26, 23, 0.82);
  color: #F3F4F1;
  font: 600 12px/1.6 var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.card-new {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 2px 9px;
  border-radius: 6px;
  background: var(--saffron);
  color: #241700;
  font: 700 11.5px/1.7 var(--font-mono);
  letter-spacing: 0.06em;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  padding: 14px 15px 15px;
}
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
  font: 500 11.5px var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.card-brand {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--cobalt);
  font-weight: 600;
}
.card-type { flex: none; }
.card-title {
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.38;
}
.card-attrs { display: flex; flex-wrap: wrap; gap: 5px; }
.attr {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--paper-2);
  font-size: 12.5px;
  color: var(--ink-2);
}

.proximity {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 6px;
  font: 500 11.5px var(--font-mono);
  color: var(--ink-3);
}
.proximity-track {
  display: block;
  height: 4px;
  border-radius: 99px;
  background: var(--paper-2);
  overflow: hidden;
}
.proximity-fill {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: var(--cobalt);
  transform-origin: left;
  animation: grow 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.proximity-score { color: var(--ink-2); font-variant-numeric: tabular-nums; }

/* Skeletons */
.skeleton {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--sheet);
  overflow: hidden;
}
.skeleton-photo { aspect-ratio: 1 / 1; }
.skeleton-photo, .skeleton-line {
  background: linear-gradient(90deg, var(--paper-2) 25%, var(--rule) 37%, var(--paper-2) 63%) 0 0 / 400% 100%;
  animation: shimmer 1.3s ease infinite;
}
.skeleton-body { display: grid; gap: 10px; padding: 15px; }
.skeleton-line { height: 11px; border-radius: 6px; }
.skeleton-line.w40 { width: 40%; }
.skeleton-line.w90 { width: 90%; }
.skeleton-line.w70 { width: 70%; }

/* States */
.state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 36px 20px;
  border: 1.5px dashed var(--rule-strong);
  border-radius: var(--radius-lg);
  text-align: center;
}
.state-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.state-sub { margin: 0; max-width: 52ch; color: var(--ink-2); }
.state-error .state-title { color: var(--danger); }
.state .examples { justify-content: center; margin-top: 6px; }

/* ── How it works ─────────────────────────────────────────────────────── */
.how {
  padding-block: 72px 24px;
}
.section-head { display: grid; gap: 6px; margin-bottom: 24px; }
.eyebrow-plain { color: var(--ink-3); }
.how h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--sheet);
}
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 31px;
  right: -13px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--rule-strong);
  border-right: 2px solid var(--rule-strong);
  transform: rotate(45deg);
}
.step-no {
  font: 600 13px var(--font-mono);
  color: var(--cobalt);
}
.step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
}
.step p { margin: 0; flex: 1; font-size: 14.5px; color: var(--ink-2); }

.tech {
  align-self: flex-start;
  padding: 3px 9px;
  border-radius: 6px;
  font: 600 12px/1.5 var(--font-mono);
}
.tech-redis  { background: var(--tech-redis-bg);  color: var(--tech-redis-ink); }
.tech-ml     { background: var(--tech-ml-bg);     color: var(--tech-ml-ink); }
.tech-qdrant { background: var(--tech-qdrant-bg); color: var(--tech-qdrant-ink); }
.tech-spark  { background: var(--tech-spark-bg);  color: var(--tech-spark-ink); }
.tech-kafka  { background: var(--tech-kafka-bg);  color: var(--tech-kafka-ink); }

.behind {
  margin-top: 28px;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--paper-2);
  border: 1px solid var(--rule);
}
.behind h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
}
.behind-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.behind-item { display: flex; flex-direction: column; gap: 8px; }
.behind-item p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
.arch-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-weight: 600;
  color: var(--cobalt);
  text-decoration: none;
}
.arch-link svg {
  width: 16px; height: 16px;
  fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round;
}
.arch-link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ── Footer ───────────────────────────────────────────────────────────── */
.footer {
  margin-top: 40px;
  font-size: 14px;
  color: var(--ink-2);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 28px 40px;
  border-top: 1px solid var(--rule);
}
.footer p { margin: 0; }
.footer a { color: var(--ink); text-underline-offset: 3px; }
.footer-stack { font-size: 12.5px; color: var(--ink-3); }

/* ── Motion ───────────────────────────────────────────────────────────── */
@keyframes rise   { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes grow   { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: 0 0; } }
@keyframes pulse  { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
@keyframes nudge  { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(4px); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 980px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 28px; padding-top: 24px; }
  #field { min-height: 240px; }
  .specs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .spec:nth-child(4) { padding-left: 0; border-left: 0; }
  .spec:nth-child(n + 4) { border-top: 1px solid var(--rule); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(2)::after { display: none; }
  .behind-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 600px) {
  .topnav a:not(.topnav-gh) { display: none; }
  .hero-title { font-size: 2.45rem; }
  .lede { font-size: 16px; }
  .kbd { display: none; }
  .search { min-height: 58px; padding-left: 14px; }
  .search-btn { height: 44px; padding: 0 14px; }
  .search-btn .btn-text { display: none; }
  .specs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec { padding: 14px 12px 14px 0; }
  .spec + .spec { padding-left: 12px; }
  .spec:nth-child(odd) { padding-left: 0; border-left: 0; }
  .spec:nth-child(even) { padding-left: 12px; border-left: 1px solid var(--rule); }
  .spec:nth-child(n + 3) { border-top: 1px solid var(--rule); }
  .spec:nth-child(5) { grid-column: 1 / -1; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .card-photo img { padding: 10px; }
  .card-body { padding: 11px 11px 12px; }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .step::after { display: none; }
  .trace-time { margin-left: 0; }
}