/* Scroll-driven homepage concept. Deliberately scoped to .concept-home. */
:root {
  --night: #070b0a;
  --night-raised: #0d1311;
  --night-line: rgba(222, 245, 236, 0.16);
  --night-muted: #91a49e;
  --night-ink: #eef7f3;
  --signal: #76e7c6;
  --signal-strong: #9ff4da;
  --paper: #f2f1eb;
  --paper-raised: #e8e7df;
  --paper-ink: #111714;
  --paper-muted: #56605b;
  --paper-line: #c9cbc4;
  --concept-wide: min(118rem, calc(100vw - 8rem));
  --story-progress: 0;
  --scene-progress: 0;
}

html { scroll-behavior: smooth; }
body.concept-home { overflow-x: clip; background: var(--night); color: var(--night-ink); font-size: 1rem; line-height: 1.55; }
.concept-home main { padding: 0; }
.concept-home a { color: inherit; text-decoration: none; }
.concept-home a:hover { color: inherit; }
.concept-home ::selection { color: var(--night); background: var(--signal); }

.concept-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 5rem;
  padding: 0 4rem;
  border-bottom: 1px solid rgba(222, 245, 236, 0.11);
  background: rgba(7, 11, 10, 0.96);
  box-shadow: 0 1px 0 rgba(222, 245, 236, 0.04);
  color: var(--night-ink);
}
.concept-wordmark { display: inline-flex; align-items: center; gap: .75rem; justify-self: start; font-weight: 600; letter-spacing: -.02em; }
.wordmark-mark { display: grid; width: 1.9rem; height: 1.9rem; place-items: center; border: 1px solid currentColor; font-size: .78rem; font-weight: 700; }
.home-menu-toggle,.home-menu-label,.concept-nav .mobile-review-link { display:none; }
.concept-nav { display: flex; align-items: center; gap: 2rem; font-size: .76rem; letter-spacing: .11em; text-transform: uppercase; }
.concept-nav a, .header-action { position: relative; color: #afc0ba; }
.concept-nav a::after { position: absolute; right: 0; bottom: -.45rem; left: 0; height: 1px; background: var(--signal); content: ''; transform: scaleX(0); transform-origin: right; transition: transform 180ms ease; }
.concept-nav a:hover { color: var(--night-ink); }
.concept-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.header-action { justify-self: end; padding-bottom: .2rem; border-bottom: 1px solid currentColor; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.header-action:hover { color: var(--signal); }

.story { position: relative; min-height: 100svh; background: var(--night); }
.story-sticky { position: relative; min-height: 100svh; overflow: hidden; }
.js .story { height: 560svh; }
.js .story-sticky { position: sticky; top: 0; height: 100svh; }
.story::after { position: absolute; inset: auto 0 0; height: 16rem; pointer-events: none; background: linear-gradient(to bottom, transparent, var(--night)); content: ''; }

.system-visual { position: absolute; inset: 0; opacity: .9; transition: opacity 500ms ease; }
.system-visual::after { position: absolute; z-index: 2; inset: 0; pointer-events: none; background: linear-gradient(90deg, var(--night) 0%, var(--night) 47%, rgba(7,11,10,.88) 56%, transparent 72%); content: ''; }
.visual-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(133, 170, 157, .055) 1px, transparent 1px), linear-gradient(90deg, rgba(133, 170, 157, .055) 1px, transparent 1px); background-size: 5vw 5vw; mask-image: linear-gradient(to right, rgba(0,0,0,.8), transparent 85%); }
.topology { position: absolute; top: 50%; left: 72%; width: min(60vw, 72rem); height: auto; overflow: visible; transform: translate(-50%, -50%) scale(calc(.88 + var(--story-progress) * .1)); transition: transform 400ms cubic-bezier(.2,.8,.2,1); }
.line { fill: none; stroke: rgba(167, 195, 185, .42); stroke-width: 1.5; vector-effect: non-scaling-stroke; transition: stroke 500ms ease, stroke-width 500ms ease; }
.trace { fill: none; stroke: url(#trace-gradient); stroke-width: 2.5; stroke-dasharray: 18 310; stroke-dashoffset: calc(var(--story-progress) * -900px); opacity: 0; filter: url(#soft-glow); transition: opacity 500ms ease; vector-effect: non-scaling-stroke; }
.node circle { fill: var(--night); stroke: rgba(161, 184, 176, .54); stroke-width: 1.5; vector-effect: non-scaling-stroke; transition: fill 500ms ease, stroke 500ms ease, transform 500ms ease; }
.node > text { fill: #a7bbb4; font-family: var(--font-mono); font-size: 15px; text-anchor: middle; letter-spacing: .05em; }
.node .node-label { font-size: 10px; letter-spacing: .18em; opacity: .75; }
.gateway-orbit { fill: none; stroke: rgba(118, 231, 198, .29); stroke-width: 1; stroke-dasharray: 3 8; transform-origin: center; vector-effect: non-scaling-stroke; }
.orbit-a { animation: orbit 22s linear infinite; }
.orbit-b { animation: orbit 15s linear infinite reverse; }
.gateway-core { fill: rgba(118, 231, 198, .04); stroke: var(--signal); stroke-width: 1.5; filter: url(#soft-glow); vector-effect: non-scaling-stroke; }
.gateway-mark { fill: none; stroke: var(--signal); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.gateway-label { fill: var(--signal); font-family: var(--font-mono); font-size: 11px; text-anchor: middle; letter-spacing: .18em; }
@keyframes orbit { to { transform: rotate(360deg); } }

body[data-scene="0"] .provider circle { stroke: #d19772; }
body[data-scene="0"] .destination circle { stroke: #7e8c87; opacity: .5; }
body[data-scene="1"] .line, body[data-scene="2"] .line, body[data-scene="3"] .line, body[data-scene="4"] .line { stroke: rgba(118,231,198,.38); }
body[data-scene="1"] .gateway-core, body[data-scene="2"] .gateway-core, body[data-scene="3"] .gateway-core, body[data-scene="4"] .gateway-core { fill: rgba(118,231,198,.11); }
body[data-scene="2"] .trace-a, body[data-scene="2"] .trace-b, body[data-scene="2"] .trace-c { opacity: 1; }
body[data-scene="3"] .trace-a, body[data-scene="3"] .trace-b, body[data-scene="3"] .trace-c { opacity: .7; stroke-dasharray: 5 24; }
body[data-scene="3"] .destination-c circle { fill: rgba(118,231,198,.15); stroke: var(--signal); }
body[data-scene="4"] .node circle { fill: rgba(118,231,198,.08); stroke: var(--signal); }
body[data-scene="4"] .topology { transform: translate(-50%, -50%) scale(1.04); }

.visual-caption { position: absolute; right: 4rem; bottom: 2.2rem; display: flex; gap: 1.5rem; color: var(--night-muted); font-family: var(--font-mono); font-size: .62rem; letter-spacing: .13em; }
.caption-state { color: var(--signal); }

.story-copy { position: absolute; z-index: 4; top: 0; right: 0; bottom: 0; left: 0; width: var(--concept-wide); margin: 0 auto; pointer-events: none; }
.scene-copy { max-width: 42rem; padding-top: clamp(9rem, 21vh, 15rem); opacity: 1; pointer-events: auto; }
.scene-copy:not(:first-child) { margin-top: 12rem; }
.scene-index { margin: 0 0 1.7rem; color: var(--signal); font-family: var(--font-mono); font-size: .68rem; font-weight: 600; letter-spacing: .18em; }
.scene-copy h1, .scene-copy h2 { max-width: 12ch; margin: 0; color: var(--night-ink); font-size: clamp(3rem, 5.25vw, 6.7rem); font-weight: 520; line-height: .94; letter-spacing: -.055em; text-wrap: balance; }
.scene-copy p:not(.scene-index) { max-width: 35rem; margin: 2rem 0 0; color: var(--night-muted); font-size: clamp(1rem, 1.25vw, 1.3rem); line-height: 1.55; text-wrap: pretty; }
.scene-link { display: inline-flex; gap: 1.5rem; align-items: center; margin-top: 2.5rem; padding-bottom: .35rem; border-bottom: 1px solid var(--night-line); color: var(--night-ink); font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
.concept-primary { margin-top: 2.5rem; padding: .9rem 1.15rem; border: 1px solid var(--signal); background: var(--signal); color: var(--night) !important; font-family: var(--font-mono); font-size: .74rem; letter-spacing: .05em; text-transform: uppercase; }
.concept-primary:hover { border-color: var(--night-ink); background: var(--night-ink); color: var(--night) !important; }

.js .scene-copy { position: absolute; inset: 0 auto auto 0; margin-top: 0; opacity: 0; transform: translateY(2rem); visibility: hidden; transition: opacity 360ms ease, transform 520ms cubic-bezier(.2,.8,.2,1); }
.js .scene-copy.is-active { opacity: 1; transform: translateY(0); visibility: visible; }

.chapter-rail { position: absolute; z-index: 6; top: 50%; right: 0; display: flex; width: 11rem; flex-direction: column; gap: .2rem; padding: .75rem 1rem .75rem 2rem; border-left: 1px solid rgba(135,154,148,.24); background: linear-gradient(90deg, rgba(7,11,10,.35), rgba(7,11,10,.96) 24%); transform: translateY(-50%); }
.chapter-rail a { display: grid; position: relative; grid-template-columns: 1.7rem 1fr; gap: .45rem; align-items: center; min-height: 2.3rem; color: #879a94; font-family: var(--font-mono); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase; transition: color 180ms ease; }
.chapter-rail a::before { position: absolute; left: -1.25rem; width: .95rem; height: 1px; background: currentColor; content: ''; transform: scaleX(.3); transform-origin: left; transition: transform 250ms ease; }
.chapter-rail b { font-weight: 500; opacity: .52; transform: none; transition: opacity 180ms ease; }
.chapter-rail a:hover b, .chapter-rail a.is-active b { opacity: 1; }
.chapter-rail a.is-active { color: var(--signal); }
.chapter-rail a.is-active::before { transform: scaleX(1); }
.scroll-meter { position: absolute; z-index: 8; right: 0; bottom: 0; left: 0; height: 2px; background: rgba(255,255,255,.05); }
.scroll-meter span { display: block; width: calc(var(--story-progress) * 100%); height: 100%; background: var(--signal); }
.story-steps { position: absolute; inset: 0; display: grid; grid-template-rows: repeat(5, 1fr); pointer-events: none; }
.story-steps span { scroll-margin-top: 0; }

.evidence-section { position: relative; z-index: 10; padding: clamp(6rem, 10vw, 11rem) 0; background: var(--paper); color: var(--paper-ink); }
.evidence-shell { width: min(92rem, calc(100vw - 8rem)); margin: 0 auto; }
.light-kicker { margin: 0 0 1.35rem; color: #236653; font-family: var(--font-mono); font-size: .68rem; font-weight: 650; letter-spacing: .18em; }
.evidence-intro { display: grid; grid-template-columns: 1fr 1.25fr; column-gap: 7vw; align-items: start; }
.evidence-intro .light-kicker { grid-column: 1 / -1; }
.evidence-intro h2 { max-width: 10ch; margin: 0; font-size: clamp(3.2rem, 6vw, 6.6rem); font-weight: 520; line-height: .92; letter-spacing: -.06em; }
.evidence-intro > p:last-child { max-width: 37rem; margin: .5rem 0 0; color: var(--paper-muted); font-size: clamp(1.1rem, 1.65vw, 1.55rem); line-height: 1.5; }

.proof-ledger { display: grid; grid-template-columns: repeat(4, 1fr); margin: clamp(5rem, 9vw, 9rem) 0 0; border-top: 1px solid var(--paper-line); border-bottom: 1px solid var(--paper-line); }
.proof-ledger div { min-height: 9rem; padding: 1.5rem; border-right: 1px solid var(--paper-line); }
.proof-ledger div:first-child { padding-left: 0; }
.proof-ledger div:last-child { border-right: 0; }
.proof-ledger dt { font-size: clamp(2.2rem, 4vw, 4rem); line-height: 1; letter-spacing: -.06em; }
.proof-ledger dd { max-width: 14ch; margin: .9rem 0 0; color: var(--paper-muted); font-size: .78rem; letter-spacing: .08em; line-height: 1.45; text-transform: uppercase; }

.decision-paths { margin-top: 7rem; border-top: 1px solid var(--paper-ink); }
.decision-paths > a { display: grid; grid-template-columns: 4rem minmax(0, 1fr) auto; gap: 2rem; align-items: start; padding: 2.4rem 0; border-bottom: 1px solid var(--paper-line); transition: padding 240ms ease, background 240ms ease; }
.decision-paths > a:hover { padding-right: 1.25rem; padding-left: 1.25rem; background: var(--paper-raised); }
.path-number { padding-top: .25rem; color: #236653; font-family: var(--font-mono); font-size: .72rem; }
.path-copy { display: grid; grid-template-columns: minmax(14rem, .75fr) 1fr; gap: 3rem; }
.path-copy strong { font-size: clamp(1.35rem, 2.3vw, 2.35rem); font-weight: 520; line-height: 1.12; letter-spacing: -.035em; }
.path-copy small { max-width: 38rem; color: var(--paper-muted); font-size: 1rem; line-height: 1.6; }
.path-arrow { font-size: 1.3rem; transition: transform 180ms ease; }
.decision-paths a:hover .path-arrow { transform: translate(.2rem, -.2rem); }

.featured-proof { margin-top: clamp(7rem, 11vw, 11rem); }
.proof-heading { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; margin-bottom: 2rem; }
.proof-heading .light-kicker { grid-column: 1 / -1; }
.proof-heading h2 { max-width: 18ch; margin: 0; font-size: clamp(2rem, 3.5vw, 4rem); font-weight: 520; line-height: 1; letter-spacing: -.05em; }
.proof-heading > a { padding-bottom: .4rem; border-bottom: 1px solid var(--paper-ink); font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }
.proof-feature { display: grid; grid-template-columns: 1.35fr .65fr; min-height: 32rem; border: 1px solid var(--paper-line); background: #e5e6de; }
.proof-diagram { display: grid; min-height: 30rem; padding: 2.5rem; place-items: center; border-right: 1px solid var(--paper-line); overflow: hidden; }
.proof-diagram img { width: 100%; max-height: 29rem; object-fit: contain; filter: saturate(.65) contrast(1.03); transition: transform 700ms cubic-bezier(.2,.8,.2,1); }
.proof-feature:hover .proof-diagram img { transform: scale(1.025); }
.proof-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 1.25rem; padding: 2.5rem; }
.proof-copy strong { margin-top: auto; font-size: clamp(1.8rem, 3vw, 3.2rem); font-weight: 520; line-height: 1; letter-spacing: -.05em; }
.proof-copy > span:not(.tag) { color: var(--paper-muted); }
.proof-copy em { padding-bottom: .2rem; border-bottom: 1px solid currentColor; font-family: var(--font-mono); font-size: .7rem; font-style: normal; letter-spacing: .08em; text-transform: uppercase; }
.proof-index { display: grid; grid-template-columns: repeat(3, 1fr); border-right: 1px solid var(--paper-line); border-bottom: 1px solid var(--paper-line); border-left: 1px solid var(--paper-line); }
.proof-index a { display: flex; flex-direction: column; gap: .75rem; min-height: 15rem; padding: 1.6rem; border-right: 1px solid var(--paper-line); }
.proof-index a:last-child { border-right: 0; }
.proof-index a:hover { background: var(--paper-raised); }
.proof-index span { color: #236653; font-family: var(--font-mono); font-size: .64rem; letter-spacing: .1em; }
.proof-index strong { margin-top: auto; font-size: 1.25rem; font-weight: 550; line-height: 1.25; }
.proof-index small { color: var(--paper-muted); font-size: .84rem; line-height: 1.5; }

.garden-portal { display: grid; grid-template-columns: .78fr 1.22fr; gap: 8vw; margin-top: clamp(7rem, 12vw, 12rem); padding-top: 2rem; border-top: 1px solid var(--paper-ink); }
.garden-statement h2 { max-width: 10ch; margin: 0; font-size: clamp(2.5rem, 4.3vw, 4.8rem); font-weight: 520; line-height: .98; letter-spacing: -.055em; }
.garden-statement > p:not(.light-kicker) { max-width: 31rem; margin: 1.5rem 0; color: var(--paper-muted); }
.garden-statement > a { display: inline-block; padding-bottom: .25rem; border-bottom: 1px solid currentColor; font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }
.question-list { border-top: 1px solid var(--paper-line); }
.question-list a { display: grid; grid-template-columns: 2.2rem 1fr auto; gap: 1rem; align-items: center; min-height: 4.7rem; border-bottom: 1px solid var(--paper-line); font-size: 1rem; }
.question-list a:hover { color: #236653; }
.question-list span { color: var(--paper-muted); font-family: var(--font-mono); font-size: .62rem; }
.question-list b { font-weight: 400; transition: transform 180ms ease; }
.question-list a:hover b { transform: translateX(.35rem); }

.closing-scene { position: relative; z-index: 10; display: flex; min-height: 100svh; flex-direction: column; justify-content: space-between; overflow: hidden; padding: 10rem 4rem 2rem; background: #08110e; color: var(--night-ink); }
.closing-network { position: absolute; inset: 0; background-image: radial-gradient(circle at var(--cursor-x, 76%) var(--cursor-y, 38%), rgba(118,231,198,.2), transparent 18%), linear-gradient(rgba(133,170,157,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(133,170,157,.06) 1px, transparent 1px); background-size: auto, 5vw 5vw, 5vw 5vw; opacity: .85; }
.closing-network::before, .closing-network::after { position: absolute; border: 1px solid rgba(118,231,198,.2); border-radius: 50%; content: ''; }
.closing-network::before { top: 15%; right: 13%; width: 27vw; height: 27vw; }
.closing-network::after { top: calc(15% + 5vw); right: calc(13% + 5vw); width: 17vw; height: 17vw; }
.closing-content { position: relative; z-index: 2; width: min(92rem, 100%); margin: auto; }
.closing-content > p { color: var(--signal); font-family: var(--font-mono); font-size: .66rem; letter-spacing: .16em; }
.closing-content h2 { max-width: 11ch; margin: 1.5rem 0 3rem; font-size: clamp(4rem, 8.2vw, 9rem); font-weight: 500; line-height: .88; letter-spacing: -.065em; text-wrap: balance; }
.closing-actions { display: flex; gap: 1rem 2.5rem; align-items: center; flex-wrap: wrap; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.closing-actions > a:not(.closing-primary) { padding-bottom: .25rem; border-bottom: 1px solid var(--night-line); color: var(--night-muted); }
.closing-actions > a:hover { color: var(--signal); }
.closing-primary { padding: 1rem 1.2rem; border: 1px solid var(--signal); background: var(--signal); color: var(--night) !important; }
.closing-primary:hover { background: var(--night-ink); border-color: var(--night-ink); }
.concept-footer { position: relative; z-index: 2; display: flex; justify-content: space-between; gap: 2rem; width: 100%; padding-top: 1.5rem; border-top: 1px solid rgba(238,247,243,.22); color: #a8bab4; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.concept-footer > span:last-child { display: flex; gap: 1.5rem; }
.concept-footer a:hover { color: var(--signal); }

.concept-home .cookie-consent {
  right: 1.5rem;
  bottom: 1.5rem;
  left: auto;
  width: min(30rem, calc(100vw - 3rem));
  margin: 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(118,231,198,.28);
  border-radius: 0;
  background: #101815;
  box-shadow: 0 1rem 4rem rgba(0,0,0,.38);
  color: var(--night-ink);
}
.concept-home .cookie-consent-copy p { color: #a9bbb5; font-size: .78rem; line-height: 1.45; }
.concept-home .cookie-consent-copy a { color: var(--signal); text-decoration: underline; }
.concept-home .cookie-consent-actions { gap: .45rem; }
.concept-home .cookie-consent-actions .button-link { min-width: 8.5rem; min-height: 2.55rem; flex: 1 1 0; justify-content: center; padding: .55rem .75rem; border: 1px solid var(--signal); border-radius: 0; background: transparent; color: var(--signal) !important; font-family: var(--font-mono); font-size: .64rem; letter-spacing: .05em; text-transform: uppercase; }
.concept-home .cookie-consent-actions .button-link:hover { background: var(--signal); color: var(--night) !important; }
.concept-home .cookie-consent-actions .button-link-secondary { border-color: var(--signal); color: var(--signal) !important; }

@media (max-width: 900px) {
  :root { --concept-wide: calc(100vw - 3rem); }
  .concept-header { grid-template-columns: 1fr auto; min-height: 4.5rem; padding: 0 1.5rem; }
  .home-menu-toggle { display:block; position:absolute; opacity:0; width:1px; height:1px; }
  .home-menu-label { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:5px; width:44px; height:44px; cursor:pointer; touch-action:manipulation; }
  .home-menu-label span { display:block; width:20px; height:2px; background:var(--night-ink); }
  .home-menu-toggle:focus-visible + .home-menu-label { outline:2px solid var(--signal); outline-offset:2px; }
  .home-menu-toggle:checked + .home-menu-label span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
  .home-menu-toggle:checked + .home-menu-label span:nth-child(2) { opacity:0; }
  .home-menu-toggle:checked + .home-menu-label span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }
  .concept-nav { display:none; position:absolute; inset:100% 0 auto; flex-direction:column; align-items:stretch; gap:0; padding:.5rem 1.5rem 1rem; max-height:calc(100svh - 4.5rem); overflow:auto; background:var(--night); border-bottom:1px solid var(--night-line); }
  .home-menu-toggle:checked ~ .concept-nav { display:flex; }
  .concept-nav a { display:flex; align-items:center; min-height:48px; padding:.75rem 0; border-bottom:1px solid var(--night-line); font-size:.85rem; }
  .concept-nav a::after { display:none; }
  .concept-nav .mobile-review-link { display:flex; color:var(--signal); }
  .header-action { display:none; }
  .topology { top: 62%; left: 63%; width: 105vw; opacity: .65; }
  .scene-copy { padding-top: 9rem; }
  .scene-copy h1, .scene-copy h2 { font-size: clamp(3.3rem, 10vw, 5.8rem); }
  .chapter-rail { right: 1.5rem; top: auto; bottom: 2.2rem; width: auto; flex-direction: row; gap: .6rem; padding: .2rem .4rem; border-top: 1px solid rgba(135,154,148,.2); border-bottom: 1px solid rgba(135,154,148,.2); border-left: 0; background: rgba(7,11,10,.62); transform: none; }
  .chapter-rail a { display: block; min-width: 1.7rem; min-height: 2.75rem; padding: .8rem .25rem; text-align: center; }
  .chapter-rail a::before, .chapter-rail b { display: none; }
  .visual-caption { right: auto; bottom: 2rem; left: 1.5rem; }
  .evidence-shell { width: calc(100vw - 3rem); }
  .evidence-intro { grid-template-columns: 1fr; row-gap: 2rem; }
  .evidence-intro .light-kicker { grid-column: auto; }
  .evidence-intro h2 { max-width: 11ch; }
  .proof-ledger { grid-template-columns: repeat(2, 1fr); }
  .proof-ledger div:nth-child(2) { border-right: 0; }
  .proof-ledger div:nth-child(-n + 2) { border-bottom: 1px solid var(--paper-line); }
  .proof-ledger div:nth-child(3) { padding-left: 0; }
  .path-copy { grid-template-columns: 1fr; gap: .75rem; }
  .proof-feature { grid-template-columns: 1fr; }
  .proof-diagram { border-right: 0; border-bottom: 1px solid var(--paper-line); }
  .proof-copy { min-height: 25rem; }
  .garden-portal { grid-template-columns: 1fr; gap: 4rem; }
  .closing-scene { padding: 8rem 1.5rem 1.5rem; }
}

@media (max-width: 600px) {
  .concept-home .cookie-consent { right: 1rem; bottom: 1rem; left: 1rem; width: auto; align-items: stretch; }
  .concept-home .cookie-consent-actions { justify-content: flex-start; flex-wrap: wrap; }
  .concept-home .cookie-consent-actions .button-link { flex: 1 1 9rem; }
  .concept-wordmark > span:last-child { display:inline; }
  .header-action { max-width: 10rem; text-align: right; }
  .story { min-height: auto; }
  .js .story { height: 520svh; }
  .scene-copy { padding-top: 7.6rem; }
  .scene-copy h1, .scene-copy h2 { max-width: 10ch; font-size: clamp(2.85rem, 13.2vw, 4.3rem); line-height: .92; }
  .scene-copy p:not(.scene-index) { max-width: 28rem; margin-top: 1.3rem; font-size: .98rem; }
  .scene-index { margin-bottom: 1rem; }
  .concept-primary { margin-top: 1.5rem; }
  .topology { top: 67%; left: 67%; width: 145vw; }
  .system-visual::after { background: linear-gradient(180deg, var(--night) 0%, var(--night) 47%, rgba(7,11,10,.62) 58%, transparent 76%); }
  .visual-grid { background-size: 12vw 12vw; }
  .visual-caption { bottom: 5.8rem; }
  .evidence-section { padding: 6rem 0; }
  .evidence-intro h2 { font-size: 3.35rem; }
  .proof-ledger { margin-top: 4rem; }
  .proof-ledger div { min-height: 7.5rem; padding: 1rem; }
  .decision-paths { margin-top: 5rem; }
  .decision-paths > a { grid-template-columns: 2rem minmax(0, 1fr) auto; gap: .75rem; padding: 1.7rem 0; }
  .decision-paths > a:hover { padding-right: 0; padding-left: 0; background: transparent; }
  .path-copy strong { font-size: 1.4rem; }
  .path-copy small { font-size: .88rem; }
  .proof-heading { grid-template-columns: 1fr; gap: 1rem; align-items: start; }
  .proof-heading > a { justify-self: start; }
  .proof-feature { min-height: 0; }
  .proof-diagram { min-height: 18rem; padding: 1rem; }
  .proof-copy { min-height: 21rem; padding: 1.5rem; }
  .proof-index { grid-template-columns: 1fr; }
  .proof-index a { min-height: 11rem; border-right: 0; border-bottom: 1px solid var(--paper-line); }
  .proof-index a:last-child { border-bottom: 0; }
  .garden-statement h2 { font-size: 3.2rem; }
  .question-list a { min-height: 4rem; font-size: .9rem; line-height: 1.35; }
  .closing-content h2 { font-size: clamp(3.7rem, 17vw, 5.4rem); }
  .closing-actions { align-items: flex-start; flex-direction: column; }
  .concept-footer { align-items: flex-start; flex-direction: column; }
  .concept-footer > span:last-child { gap: .8rem 1.2rem; flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .topology { transform: translate(-50%, -50%) !important; }
}