/* Better case study — pool-depth world.
   One tile module (--u) governs spacing; fields deepen with the chapters. */

:root {
  --green: #7ab850;          /* brand */
  --green-ink: #3a6f22;      /* brand green readable on paper */
  --paper: #f3f7ee;
  --pale: #e2eed7;
  --deep: #1d3d21;
  --abyss: #0d1f10;
  --ink: #10240f;
  --ink-soft: #33502f;
  --on-dark: #e8f2e0;
  --on-dark-soft: #c6dcba;
  --tile-grout: rgba(255,255,255,.14);

  --u: 8px;
  --m: clamp(16px, 3vw, 40px);
  --sec: clamp(120px, 14vw, 216px);

  --f-xl: clamp(64px, 10vw, 156px);   /* display */
  --f-l: clamp(34px, 4.6vw, 72px);    /* section headings */
  --f-m: clamp(21px, 2vw, 32px);      /* statements, quotes */
  --f-b: 18px;                        /* text */
  --f-s: 15px;                        /* notes */

  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--f-b);
  line-height: 1.6;
  hyphens: manual;
  overflow-wrap: break-word;
  font-feature-settings: "ss06";
  -webkit-font-smoothing: antialiased;
}
img, video { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; text-underline-offset: .2em; text-decoration-thickness: .08em; }
::selection { background: var(--green); color: var(--ink); }
:focus-visible { outline: 3px solid var(--green); outline-offset: 3px; }
[data-tone="green"] :focus-visible, .cta:focus-visible { outline-color: var(--ink); }
html { scrollbar-color: var(--green-ink) var(--paper); }

.visually-hidden, .skip:not(:focus) {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.skip:focus { position: fixed; top: 8px; left: 8px; z-index: 50; background: var(--ink); color: var(--paper); padding: 8px 16px; }

/* ---------- fields ---------- */
[data-tone="surface"] { background: var(--paper); color: var(--ink); }
[data-tone="pale"]    { background: var(--pale); color: var(--ink); }
[data-tone="green"]   { background: var(--green); color: var(--ink); }
[data-tone="deep"]    { background: var(--deep); color: var(--on-dark); }
[data-tone="abyss"]   { background: var(--abyss); color: var(--on-dark); }

section, .bleed { padding-inline: var(--m); }

/* ---------- shared type ---------- */
.h-ch, .h-sec, .h-find, .h-insight {
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.08; text-wrap: balance;
}
.h-sec { font-size: var(--f-l); }
.h-find { font-size: clamp(32px, 3.6vw, 56px); }
.h-ch { font-size: var(--f-l); }
.depth-big {
  font-size: var(--f-xl); font-weight: 900; letter-spacing: -0.04em; line-height: .9;
  font-variant-numeric: tabular-nums;
}
.btn {
  display: inline-flex; align-items: center; min-height: 48px; padding: 0 24px;
  background: var(--green); color: var(--ink); font-weight: 700; font-size: 16px;
  text-decoration: none; border-radius: 0;
  transition: background-color .2s var(--ease-out), transform .2s var(--ease-out);
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn:active { transform: translateY(1px); }

.quote p:first-child { font-size: var(--f-m); font-weight: 600; line-height: 1.45; letter-spacing: -0.015em; }
.quote-en { margin-top: calc(var(--u) * 2); font-size: 16px; line-height: 1.55; font-style: italic; }
.quote footer { margin-top: calc(var(--u) * 1.5); font-size: var(--f-s); font-weight: 600; }
[data-tone="deep"] .quote-en, [data-tone="abyss"] .quote-en { color: var(--on-dark-soft); opacity: 1; }

/* ---------- depth gauge ---------- */
.gauge {
  position: fixed; right: var(--m); top: 50%; z-index: 20;
  transform: translateY(-50%);
  font-size: var(--f-s); line-height: 1.4;
  transition: color .4s var(--ease-out), opacity .4s var(--ease-out);
  color: var(--ink);
}
body[data-tone="deep"] .gauge, body[data-tone="abyss"] .gauge { color: var(--on-dark); }
.gauge ol { display: grid; gap: calc(var(--u) * 2); }
.gauge a { display: grid; grid-template-columns: auto; justify-items: end; text-decoration: none; opacity: .74; transition: opacity .3s var(--ease-out), transform .3s var(--ease-out); }
.gauge a:hover { opacity: .9; transform: translateX(-3px); }
.gauge a[aria-current="true"] { opacity: 1; }
.gauge-d { font-weight: 800; font-variant-numeric: tabular-nums; font-size: 16px; }
.gauge-t { font-size: var(--f-s); }
body.at-top .gauge, body.over-pic .gauge { opacity: 0; pointer-events: none; }

/* ---------- hero: waterline ---------- */
.hero {
  --fs: clamp(72px, 10.4vw, 168px);
  position: relative; height: 100svh; min-height: 560px; overflow: hidden;
  background: var(--paper);
}
.hero-fields { position: absolute; inset: 0; display: grid; grid-template-rows: 1fr 1fr; }
.hero-fields span:first-child { background: var(--paper); }
.hero-fields span:last-child { background: var(--green); }
.hero-bar {
  position: absolute; z-index: 3; inset: 0 0 auto 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: calc(var(--u) * 3) var(--m);
}
.wordmark { font-weight: 800; font-size: 17px; text-decoration: none; letter-spacing: -0.01em; }
.wordmark span { font-weight: 500; }
.waterline { position: absolute; inset: 0; z-index: 2; }
.hl {
  position: absolute; left: 0; right: 0;
  top: calc(50% - 1.42 * var(--fs));
  text-align: center;
  font-size: var(--fs); font-weight: 900; line-height: .94; letter-spacing: -0.04em;
  margin: 0;
}
.hl .ln { display: block; overflow: hidden; padding-block: .02em; }
.hl .ln > span { display: inline-block; }
.hl-above { color: var(--green-ink); clip-path: inset(0 0 calc(100% - (1.42 * var(--fs))) 0); }
.hl-below { pointer-events: none; color: var(--ink); clip-path: inset(calc(1.42 * var(--fs)) 0 0 0); }
.hero-sub {
  position: absolute; z-index: 3; left: var(--m); right: var(--m); bottom: calc(var(--u) * 5);
  text-align: center; font-size: clamp(17px, 1.5vw, 22px); font-weight: 600; color: var(--ink);
}
.hero-depth {
  position: absolute; z-index: 3; left: var(--m); top: calc(50% + var(--u) * 2);
  font-weight: 800; font-size: 16px; color: var(--ink); font-variant-numeric: tabular-nums;
}

/* ---------- facts ---------- */
.facts {
  display: grid; grid-template-columns: 1fr; gap: calc(var(--u) * 6);
  padding-block: calc(var(--sec) * .7) calc(var(--sec) * .4);
}
.facts-side { display: grid; grid-template-columns: repeat(3, auto); gap: calc(var(--u) * 3) calc(var(--u) * 6); justify-content: start; font-size: var(--f-s); }
.facts-side dt { color: var(--ink-soft); }
.facts-side dd { font-weight: 600; }
.facts-lead { font-size: var(--f-m); font-weight: 600; line-height: 1.45; letter-spacing: -0.015em; max-width: 34ch; }
.role-h { font-size: var(--f-b); font-weight: 800; margin-bottom: var(--u); }
.role-list { display: grid; gap: var(--u) calc(var(--u) * 4); }
.role-list li { font-size: var(--f-b); position: relative; padding-left: calc(var(--u) * 3); }
.role-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; background: var(--green); }
@media (min-width: 900px) { .role-list { grid-template-columns: 1fr 1fr; } }
@media (min-width: 900px) {
  .facts { grid-template-columns: 30% 1fr; column-gap: 4%; }
  .facts-side { grid-template-columns: 1fr; align-content: start; }
  .facts-role { grid-column: 2; }
}

/* ---------- chapter openers ---------- */
.chapter-open {
  position: relative; overflow: hidden;
  min-height: 60svh; display: flex; flex-direction: column; justify-content: flex-end;
  padding-block: calc(var(--sec) * .8) calc(var(--u) * 8);
}
.chapter-open .depth-big { font-size: clamp(96px, 16vw, 260px); }
.ch-row { position: relative; display: grid; gap: calc(var(--u) * 3); margin-top: calc(var(--u) * 2); }
.ch-lead { font-size: var(--f-m); font-weight: 500; line-height: 1.45; max-width: 30ch; letter-spacing: -0.015em; }
@media (min-width: 900px) { .ch-row { grid-template-columns: 1fr 1fr; column-gap: 6%; align-items: end; } }
.chapter-open .depth-big { position: relative; color: var(--green-ink); }
[data-tone="deep"].chapter-open .depth-big, [data-tone="abyss"].chapter-open .depth-big { color: var(--green); }
.ch-video {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .38;
}
#research.chapter-open { min-height: 92svh; }

/* ---------- staircase ---------- */
.stair {
  position: relative; min-height: 100svh;
  display: grid; grid-template-columns: repeat(12, 1fr); column-gap: calc(var(--u) * 2);
  align-content: center; padding-block: var(--sec);
}
.stair-text { grid-column: 1 / 10; font-size: clamp(24px, 2.5vw, 36px); font-weight: 800; line-height: 1.4; letter-spacing: -0.025em; }
.stair-text span { display: block; }
.stair-text .stair-turn { margin-top: calc(var(--u) * 6); font-size: clamp(48px, 7vw, 112px); font-weight: 900; line-height: 1; letter-spacing: -0.04em; color: var(--deep); }
.stair-pics { grid-column: 10 / 13; grid-row: 1 / 3; display: grid; gap: calc(var(--u) * 2); align-content: start; }
.stair-pics img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; filter: saturate(.9); }
figcaption { margin-top: var(--u); font-size: var(--f-s); line-height: 1.45; }
.stair-note { grid-column: 1 / 7; margin-top: calc(var(--u) * 8); font-size: var(--f-b); max-width: 52ch; }

/* ---------- model ---------- */
.model { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 10); }
.model-head { display: grid; gap: calc(var(--u) * 4); }
.model-lead { font-size: var(--f-m); line-height: 1.5; font-weight: 500; max-width: 38ch; letter-spacing: -0.01em; }
.model-levels { display: grid; gap: calc(var(--u) * 5); }
.lvl { display: grid; gap: var(--u); }
.lvl h3.chip { justify-self: start; background: var(--green); color: var(--ink); font-size: var(--f-m); font-weight: 700; letter-spacing: -0.02em; line-height: 1.3; padding: 2px 12px; }
.lvl p { max-width: 34ch; }
@media (min-width: 900px) {
  .model-head { grid-template-columns: 1fr 1fr; align-items: end; column-gap: 6%; }
  .model-levels { grid-template-columns: repeat(3, 1fr); column-gap: calc(var(--u) * 4); padding-left: 34%; }
}

/* ---------- bleed photo ---------- */
.bleed { padding-inline: 0; overflow: hidden; }
.bleed img { width: 100%; height: min(86svh, 62vw); object-fit: cover; }
.bleed figcaption { padding: calc(var(--u) * 2) var(--m) 0; max-width: 64ch; }

/* ---------- poster list ---------- */
.poster { padding-block: var(--sec); }
.poster-intro { font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; margin-bottom: calc(var(--u) * 5); }
.poster-list li {
  font-size: clamp(44px, 7.4vw, 120px); font-weight: 900; line-height: 1.02; letter-spacing: -0.04em;
  transition: color .25s var(--ease-out);
}
.poster-list li:hover { color: var(--green-ink); }
.pd { font-size: var(--f-b); font-weight: 600; letter-spacing: 0; white-space: nowrap; color: var(--ink-soft); }

/* ---------- compare specimens ---------- */
.compare { padding-block: var(--sec) 0; overflow: hidden; }
.compare-head { display: grid; gap: calc(var(--u) * 4); margin-bottom: 18vh; }
.compare-lead { font-size: var(--f-b); max-width: 58ch; }
.compare-lead q { font-weight: 700; }
.spec { display: grid; grid-template-columns: 1fr 1fr; column-gap: calc(var(--u) * 2); }
.spec-box { height: clamp(220px, 26vw, 420px); overflow: hidden; display: grid; grid-template-columns: auto 1fr; column-gap: calc(var(--u) * 3); align-items: start; }
.spec-cap { font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; padding-top: calc(var(--u) * 3); }
.spec-num { font-size: clamp(220px, 36vw, 560px); font-weight: 900; line-height: .78; letter-spacing: -0.04em; }
.spec-box:last-child .spec-num { color: var(--deep); }
@media (min-width: 900px) {
  .compare-head { grid-template-columns: 1fr 1fr; align-items: end; column-gap: 6%; }
}

/* ---------- ledger ---------- */
.ledger {
  padding-block: var(--sec);
  display: grid; gap: calc(var(--u) * 6);
}
.ledger-h { font-size: var(--f-l); font-weight: 800; line-height: 1.08; letter-spacing: -0.035em; }
.ledger-h span { display: block; }
.ledger-h span:first-child { color: var(--ink-soft); }
.ledger-rows { display: grid; gap: calc(var(--u) * 3); }
.lr { display: grid; grid-template-columns: 1fr; align-items: baseline; }
.li { font-size: var(--f-l); font-weight: 800; letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums lining-nums; }
.li { white-space: nowrap; }
@media (min-width: 900px) { .li { text-align: right; } }
.lc { font-size: var(--f-s); line-height: 1.45; grid-column: 1 / -1; padding-top: var(--u); }
.ledger-src { font-size: var(--f-s); color: var(--ink-soft); max-width: 60ch; }
@media (min-width: 900px) {
  .ledger { grid-template-columns: 5fr 7fr; column-gap: 6%; align-items: center; }
  .ledger-h { align-self: center; }
  .ledger-src { grid-column: 2; }
  .lr { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); column-gap: calc(var(--u) * 4); }
  .li { font-size: var(--f-l); }
  .lc { grid-column: auto; padding: 0; font-size: 16px; max-width: 34ch; }
}

/* ---------- pool ---------- */
.pool { padding: 0; display: grid; }
.pool-pic { overflow: hidden; }
.pool-pic img { width: 100%; height: 70svh; object-fit: cover; }
.pool-text { padding: calc(var(--sec) * .7) var(--m) var(--sec); display: grid; gap: calc(var(--u) * 6); }
.pool-body { max-width: 46ch; font-size: var(--f-b); }
@media (min-width: 900px) {
  .pool { grid-template-columns: 1fr 1fr; min-height: 100svh; }
  .pool-pic img { height: 100%; position: sticky; top: 0; max-height: 100svh; }
  .pool-text { align-content: center; padding: var(--sec) var(--m) var(--sec) 6%; }
}

/* ---------- research steps ---------- */
.steps { padding-block: calc(var(--sec) * .6) var(--sec); }
.step-list { display: grid; grid-template-columns: repeat(12, 1fr); row-gap: calc(var(--u) * 7); }
.step-list li { grid-column: 1 / -1; }
.step-line { font-size: clamp(32px, 4.6vw, 72px); font-weight: 800; line-height: 1.04; letter-spacing: -0.035em; }
.step-note { margin-top: calc(var(--u) * 1.5); max-width: 40ch; font-size: var(--f-b); }
.step-list li:last-child .step-line { color: var(--green); }
.steps-close { margin-top: calc(var(--u) * 12); font-size: var(--f-m); font-weight: 600; max-width: 30ch; line-height: 1.45; }
@media (min-width: 900px) {
  .step-list li:nth-child(1) { grid-column: 1 / -1; }
  .step-list li:nth-child(2) { grid-column: 3 / -1; }
  .step-list li:nth-child(3) { grid-column: 5 / -1; }
  .step-list li:nth-child(4) { grid-column: 6 / -1; }
  .steps-close { margin-left: calc(100% / 12 * 5); }
}

/* ---------- people tiles ---------- */
.people { padding-block: 0 var(--sec); }
.people-head { display: grid; gap: calc(var(--u) * 3); margin-bottom: calc(var(--u) * 6); }
.people-lead { max-width: 40ch; }
.tiles { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; background: var(--tile-grout); padding: 6px; }
.tiles li {
  aspect-ratio: 1; display: flex; flex-direction: column; justify-content: flex-end;
  padding: calc(var(--u) * 1.5); font-size: var(--f-s); font-weight: 700; line-height: 1.4; hyphens: auto; overflow-wrap: anywhere;
  transition: transform .25s var(--ease-out);
}
.tiles li span { display: block; font-weight: 500; }
.tiles li:hover { transform: translateY(-3px); }
.t-user { background: var(--green); color: var(--ink); }
.t-staff { background: var(--paper); color: var(--ink); }
.tiles-key { margin-top: calc(var(--u) * 2); font-size: var(--f-s); color: var(--on-dark-soft); display: flex; flex-wrap: wrap; align-items: center; gap: var(--u); }
.key { display: inline-block; width: 14px; height: 14px; }
.key-user { background: var(--green); }
.key-staff { background: var(--paper); margin-left: var(--u); }
@media (max-width: 899px) { .tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 900px) {
  .people-head { grid-template-columns: 1fr 1fr; align-items: end; column-gap: 6%; }
}

/* ---------- findings ---------- */
.finding { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 6); }
.f-quotes { display: grid; gap: calc(var(--u) * 6); }
.f-body { max-width: 46ch; font-size: var(--f-b); }
.quote-xl p:first-child { font-size: clamp(24px, 2.6vw, 36px); max-width: 26ch; }
@media (min-width: 900px) {
  .f-split { grid-template-columns: 5fr 7fr; column-gap: 6%; align-items: start; }
  .f-quotes { padding-top: calc(var(--u) * 2); }
  .f-big { grid-template-columns: 5fr 7fr; column-gap: 6%; }
  .f-big .f-body { grid-column: 1; }
  .f-big .quote-xl { grid-column: 2; grid-row: 1 / 3; align-self: end; }
}
.f-duo .duo { display: grid; gap: calc(var(--u) * 6); }
.duo-pic img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
@media (min-width: 900px) {
  .f-duo .duo { grid-template-columns: 1fr 1fr; column-gap: 6%; }
  .duo-pic { width: 66%; margin-left: auto; }
}
.frict { display: grid; gap: calc(var(--u) * 7); }
.fr h4 { font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; line-height: 1.35; color: var(--green); }
.fr p { margin-top: var(--u); max-width: 40ch; }
.fr .quote-en { margin-top: calc(var(--u) * 2); }
.fr .quote-en span { display: block; margin-top: 4px; }
@media (min-width: 900px) {
  .f-rows { grid-template-columns: 4fr 8fr; column-gap: 6%; align-items: start; }
  .frict { grid-template-columns: repeat(3, 1fr); column-gap: calc(var(--u) * 4); }
}

/* ---------- price: the live question ---------- */
.price { padding-block: 0 var(--sec); display: grid; gap: calc(var(--u) * 6); }
.price-head { display: grid; gap: calc(var(--u) * 3); }
.price-lead { max-width: 40ch; }
.seg { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; background: var(--tile-grout); padding: 4px; }
.seg button {
  font: inherit; font-size: 16px; font-weight: 700; color: var(--on-dark);
  background: var(--deep); border: 0; min-height: 56px; padding: 8px; cursor: pointer;
  transition: background-color .2s var(--ease-out), color .2s var(--ease-out), transform .15s var(--ease-out);
}
.seg button:hover { background: #2a5530; }
.seg button:active { transform: scale(.98); }
.seg button[aria-checked="true"] { background: var(--green); color: var(--ink); }
.price-count { margin: calc(var(--u) * 4) 0 calc(var(--u) * 2); font-size: var(--f-m); font-weight: 600; }
.price-count strong { font-size: var(--f-l); font-weight: 900; letter-spacing: -0.04em; margin-right: 4px; font-variant-numeric: tabular-nums; color: var(--green); }
.voters { display: grid; gap: 4px; }
.voters li {
  display: grid; grid-template-columns: 28px 1fr auto; column-gap: calc(var(--u) * 2); row-gap: 4px;
  align-items: start; padding: calc(var(--u) * 2); background: rgba(255,255,255,.04);
  transition: background-color .35s var(--ease-out), opacity .35s var(--ease-out);
}
.v-who { font-weight: 700; font-size: 16px; }
.v-say { grid-column: 2 / 3; font-size: 16px; color: var(--on-dark-soft); line-height: 1.5; }
.v-state { grid-column: 3; grid-row: 1; font-size: var(--f-s); font-weight: 700; white-space: nowrap; }
.mark {
  position: relative; overflow: hidden;
  grid-row: 1 / 3; width: 28px; height: 28px; margin-top: 2px;
  background: rgba(255,255,255,.12);
}
.mark::after {
  content: ""; position: absolute; inset: 0; background: var(--green);
  transform-origin: bottom; transition: transform .45s var(--ease-out);
}
.voters li[data-now="maybe"] .mark::after { transform: scaleY(.5); }
.voters li[data-now="leave"] .mark::after { transform: scaleY(0); }
.voters li[data-now="leave"] { opacity: .6; }
.price-note { margin-top: calc(var(--u) * 3); font-size: var(--f-s); color: var(--on-dark-soft); max-width: 62ch; }
@media (min-width: 900px) {
  .price { grid-template-columns: 4fr 8fr; column-gap: 6%; align-items: start; }
  .price-head { position: sticky; top: calc(var(--u) * 6); }
}
@media (max-width: 600px) {
  .seg { grid-template-columns: 1fr 1fr; }
  .voters li { grid-template-columns: 24px 1fr; }
  .v-state { grid-column: 2; grid-row: auto; }
  .mark { width: 24px; height: 24px; grid-row: 1 / 4; }
}

/* ---------- types ---------- */
.types { padding-block: var(--sec); }
.types-head { display: grid; gap: calc(var(--u) * 3); margin-bottom: calc(var(--u) * 9); }
.types-lead { max-width: 44ch; }
.type-grid { display: grid; gap: calc(var(--u) * 7); }
.ty h3 { font-size: var(--f-l); font-weight: 900; letter-spacing: -0.04em; line-height: 1; }
.ty h3 { color: var(--green); font-variant-numeric: tabular-nums; }
.ty h3 span { color: var(--on-dark); }
.ty p { margin-top: calc(var(--u) * 2); max-width: 36ch; }
@media (min-width: 900px) {
  .types-head { grid-template-columns: 1fr 1fr; align-items: end; column-gap: 6%; }
  .type-grid { grid-template-columns: 1fr 1fr; column-gap: 6%; row-gap: calc(var(--u) * 10); }
  .ty:nth-child(even) { margin-top: calc(var(--u) * 12); }
}

/* ---------- insight ---------- */
.insight { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 7); }
.h-insight { font-size: clamp(44px, 7vw, 116px); line-height: 1.02; letter-spacing: -0.04em; }
.insight-body { display: grid; gap: calc(var(--u) * 3); max-width: 60ch; }
.insight-turn { font-size: var(--f-m); line-height: 1.45; font-weight: 500; max-width: 32ch; letter-spacing: -0.015em; }
.insight-turn strong { font-weight: 800; color: var(--ink); background: var(--green); padding: 0 .15em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
@media (min-width: 900px) {
  .insight { grid-template-columns: 1fr 1fr; column-gap: 6%; }
  .h-insight { grid-column: 1 / -1; }
  .insight-turn { grid-column: 2; grid-row: 2; align-self: start; }
}

/* ---------- strategy ---------- */
.strategy { padding-block: 0 var(--sec); display: grid; gap: calc(var(--u) * 5); }
.status { display: inline-flex; align-items: center; gap: var(--u); font-weight: 700; font-size: 16px; }
.mark-half { display: inline-block; position: relative; overflow: hidden; width: 20px; height: 20px; background: var(--pale); }
.mark-half::after { content: ""; position: absolute; inset: 50% 0 0 0; background: var(--green); }
.strategy-lead { font-size: var(--f-m); line-height: 1.45; font-weight: 600; max-width: 34ch; letter-spacing: -0.015em; }
.questions { display: grid; gap: calc(var(--u) * 4); margin-top: calc(var(--u) * 4); }
.questions li { font-size: clamp(26px, 3.2vw, 50px); font-weight: 800; line-height: 1.15; letter-spacing: -0.03em; max-width: 24ch; text-wrap: balance; }
.questions li:nth-child(2) { margin-left: 8vw; }
.questions li:nth-child(3) { margin-left: 16vw; color: var(--green-ink); }
.strategy-pic { margin-top: calc(var(--u) * 6); }
.strategy-pic img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.strategy-pic figcaption { max-width: 60ch; }
@media (max-width: 600px) { .questions li:nth-child(n) { margin-left: 0; } }

/* ---------- cta ---------- */
.cta {
  position: relative; display: block; min-height: 60svh; padding: var(--m);
  background: var(--green); color: var(--ink); text-decoration: none; overflow: hidden;
}
.cta-note { display: block; max-width: 30ch; font-size: var(--f-b); font-weight: 600; line-height: 1.4; }
.cta-arrow { position: absolute; top: var(--m); right: var(--m); width: 48px; height: 48px; transition: transform .3s var(--ease-out); }
.cta-word {
  position: absolute; left: var(--m); bottom: 24px;
  font-size: clamp(88px, 23vw, 380px); font-weight: 900; line-height: .8; letter-spacing: -0.04em;
}
.cta:hover, .cta:focus-visible { background: var(--ink); color: var(--green); }
.cta:hover .cta-arrow { transform: translate(4px, -4px); }

/* ---------- footer ---------- */
.foot { min-height: 90svh; padding: calc(var(--u) * 5) var(--m) calc(var(--u) * 4); display: flex; flex-direction: column; }
.foot-top { display: grid; gap: calc(var(--u) * 2); font-size: var(--f-s); }
.foot-up { justify-self: start; font-size: var(--f-s); font-weight: 700; }
.foot-mail {
  margin-top: auto; display: block; text-decoration: none;
  font-size: clamp(44px, 7.6vw, 132px); font-weight: 900; letter-spacing: -0.04em; line-height: .95;
  transition: color .25s var(--ease-out);
}
.foot-mail span { display: block; }
.foot-mail:hover { color: var(--green-ink); }
.foot-meta { margin-top: calc(var(--u) * 5); display: grid; gap: calc(var(--u) * 2); font-size: var(--f-s); color: var(--ink-soft); }
.credits { max-width: 72ch; }
@media (min-width: 900px) {
  .foot-top { grid-template-columns: 1fr 1fr auto; }
  .foot-up { justify-self: end; }
  .foot-mail span { display: inline; }
  .foot-meta { grid-template-columns: 1fr 2fr 1fr; column-gap: calc(var(--u) * 4); }
  .foot-meta p:last-child { text-align: right; }
}

/* ---------- phone ---------- */
@media (max-width: 899px) {
  .gauge { display: none; }
  .stair { grid-template-columns: 1fr; }
  .stair-text, .stair-pics, .stair-note { grid-column: 1; grid-row: auto; }
  .stair-text { font-size: clamp(20px, 3.6vw, 28px); }
  .stair-pics { grid-template-columns: 1fr 1fr; margin-top: calc(var(--u) * 6); }
  .stair-note { margin-top: calc(var(--u) * 4); }
  .model-head .h-sec br, .h-find br { display: none; }
}
@media (max-width: 600px) {
  .hero { --fs: 15.5vw; }
  .hero-fields { grid-template-rows: 46fr 54fr; }
  .hl { top: calc(46% - 1.42 * var(--fs)); }
  .hl-above { clip-path: inset(0 0 calc(100% - (1.42 * var(--fs))) 0); }
  .hl-below { clip-path: inset(calc(1.42 * var(--fs)) 0 0 0); }
  .hero-sub { text-align: left; font-size: 17px; }
  .hero-depth { top: calc(46% + var(--u) * 2); }
  .wordmark span { display: none; }
  .btn { min-height: 44px; padding: 0 16px; font-size: 15px; }
  .facts-side { grid-template-columns: 1fr 1fr; }
  .facts-side div:last-child { grid-column: 1 / -1; }
  .poster-list li { font-size: 11.4vw; }
  .spec { grid-template-columns: 1fr; row-gap: calc(var(--u) * 3); }
  .spec-box { height: 38svh; }
  .spec-num { font-size: 62vw; }
  .spec-box:last-child { background: var(--ink); color: var(--green); margin-inline: calc(var(--m) * -1); padding: calc(var(--u) * 2) var(--m) 0; }
  .spec-box:last-child .spec-num { color: var(--green); }
  .cta { min-height: 46svh; }
  .cta-note { font-size: 17px; max-width: 22ch; }
  .cta-arrow { width: 32px; height: 32px; }
  .cta-word { font-size: 23vw; }
  .foot-mail { font-size: 12.4vw; }
  .tiles li { padding: 8px; font-size: 13px; }
}

/* ---------- motion ---------- */
/* one sequence besides the hero: each depth marker and its chapter title settle as you descend */
.js .chapter-open .rv { transform: translateY(18px); }
.js .chapter-open .rv.in { transform: none; transition: transform 1s var(--ease-out); transition-delay: var(--d, 0ms); }
.js .hl .ln > span { transform: translateY(105%); }
.js .hero.ready .hl .ln > span { transform: none; transition: transform .95s var(--ease-out); }
.js .hero.ready .hl .ln:nth-child(2) > span { transition-delay: .11s; }
.js .hero-sub, .js .hero-bar, .js .hero-depth { opacity: 0; transform: translateY(12px); }
.js .hero.ready .hero-sub, .js .hero.ready .hero-bar, .js .hero.ready .hero-depth { opacity: 1; transform: none; transition: opacity .7s var(--ease-out) .55s, transform .7s var(--ease-out) .55s; }
.bleed img, .pool-pic img { transform: scale(1.06); transition: transform 1.6s var(--ease-out); }
.bleed.in img, .pool.in .pool-pic img { transform: scale(1); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .rv, .js .hl .ln > span, .js .hero-sub, .js .hero-bar, .js .hero-depth { opacity: 1 !important; transform: none !important; transition: none !important; }
  .bleed img, .pool-pic img { transform: none !important; transition: none; }
  .ch-video { display: none; }
  #research.chapter-open { background: var(--deep) url("assets/underwater-pool-ai-poster.jpg") center / cover; background-blend-mode: multiply; }
}

/* keep the reading column clear of the depth gauge */
@media (min-width: 900px) {
  main > section, .foot { padding-right: calc(var(--m) + 104px); }
  .pool { padding-right: 0; }
  .pool-text { padding-right: calc(var(--m) + 104px); }
}
@media (max-width: 600px) {
  .role-list { display: grid; gap: 4px; }
  .spec-cap { font-size: var(--f-b); padding-top: var(--u); }
  .stair-text span:nth-child(n) { padding-left: 0; }
}

.h-insight { color: var(--green); }

/* ---------- strategy: make the surplus visible ---------- */
.strat-intro { padding-block: calc(var(--u) * 4) var(--sec); display: grid; gap: calc(var(--u) * 6); }
.purpose p { font-size: var(--f-m); font-weight: 600; line-height: 1.45; letter-spacing: -0.015em; max-width: 34ch; }
.purpose footer { margin-top: calc(var(--u) * 1.5); font-size: var(--f-s); font-weight: 700; color: var(--ink-soft); }
.h-strat { font-size: clamp(56px, 9vw, 150px); font-weight: 900; line-height: .98; letter-spacing: -0.04em; color: var(--green-ink); text-wrap: balance; }
.strat-lead { font-size: var(--f-m); font-weight: 500; line-height: 1.45; max-width: 36ch; letter-spacing: -0.015em; }
@media (min-width: 900px) {
  .strat-intro { grid-template-columns: 1fr 1fr; column-gap: 6%; }
  .purpose, .h-strat { grid-column: 1 / -1; }
  .strat-lead { grid-column: 2; }
}

.loop { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 7); }
.loop-head { display: grid; gap: calc(var(--u) * 3); }
.loop-head p { max-width: 44ch; }
.loop-steps { display: grid; gap: calc(var(--u) * 4); }
.loop-steps li { display: grid; gap: calc(var(--u) * 2); align-content: start; font-size: var(--f-m); font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; }
.fill { background: var(--paper); }
.fill { position: relative; display: block; width: 40px; height: 40px; background: var(--pale); overflow: hidden; }
.fill::after { content: ""; position: absolute; inset: auto 0 0 0; background: var(--green); }
.f1::after { height: 20%; } .f2::after { height: 40%; } .f3::after { height: 60%; } .f4::after { height: 80%; } .f5::after { height: 100%; }
.loop-note { font-size: var(--f-s); font-weight: 700; }
@media (min-width: 900px) {
  .loop-head { grid-template-columns: 1fr 1fr; column-gap: 6%; align-items: end; }
  .loop-steps { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .loop-steps { column-gap: calc(var(--u) * 3); }
  .loop-steps li:nth-child(2) { padding-top: calc(var(--u) * 4); } .loop-steps li:nth-child(3) { padding-top: calc(var(--u) * 8); } .loop-steps li:nth-child(4) { padding-top: calc(var(--u) * 12); } .loop-steps li:nth-child(5) { padding-top: calc(var(--u) * 16); }
}

.why-inside { padding-block: var(--sec) 0; display: grid; gap: calc(var(--u) * 4); }
.why-inside p { font-size: var(--f-m); font-weight: 500; line-height: 1.45; max-width: 40ch; letter-spacing: -0.015em; }
@media (min-width: 900px) { .why-inside { grid-template-columns: 1fr 1fr; column-gap: 6%; } }

.moves { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 9); }
.phase { display: grid; gap: calc(var(--u) * 4); }
.phase-when { display: flex; align-items: center; gap: calc(var(--u) * 1.5); font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; }
.mark-phase { position: relative; display: inline-block; width: 28px; height: 28px; background: var(--pale); overflow: hidden; }
.mark-phase::after { content: ""; position: absolute; inset: auto 0 0 0; background: var(--green); }
.p-now::after { height: 100%; } .p-next::after { height: 50%; } .p-later::after { height: 0; }
.phase-items { display: grid; gap: calc(var(--u) * 6); }
.move h4 { font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; line-height: 1.3; }
.move p { margin-top: var(--u); max-width: 52ch; }
.move .evidence { margin-top: calc(var(--u) * 2); font-size: 16px; font-style: italic; color: var(--ink-soft); max-width: 52ch; }
.move .evidence span { display: block; margin-top: 4px; font-style: normal; font-weight: 700; font-size: var(--f-s); }
@media (min-width: 900px) {
  .phase { grid-template-columns: 4fr 8fr; column-gap: 6%; }
  .phase-items { grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); column-gap: calc(var(--u) * 5); }
}

.not-doing { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 6); }
.not-list { display: grid; gap: calc(var(--u) * 5); }
.not-list h4 { font-size: var(--f-m); font-weight: 800; letter-spacing: -0.02em; line-height: 1.3; }
.not-list p { margin-top: var(--u); max-width: 46ch; }
@media (min-width: 900px) {
  .not-doing { grid-template-columns: 4fr 8fr; column-gap: 6%; }
  .not-list { grid-template-columns: 1fr 1fr; column-gap: calc(var(--u) * 5); }
}

.measure { padding-block: var(--sec); display: grid; gap: calc(var(--u) * 8); }
.base-fig { font-size: var(--f-l); font-weight: 800; letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums; }
.base-fig span { font-size: clamp(120px, 16vw, 260px); font-weight: 900; letter-spacing: -0.04em; color: var(--green-ink); margin-right: .1em; }
.base-cap { margin-top: calc(var(--u) * 2); max-width: 40ch; }
.measure-body { display: grid; gap: calc(var(--u) * 4); align-content: start; }
.measure-list { display: grid; gap: calc(var(--u) * 2); }
.measure-list li { position: relative; padding-left: calc(var(--u) * 3); max-width: 52ch; }
.measure-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; background: var(--green); }
.pilot { font-size: var(--f-m); line-height: 1.45; font-weight: 500; max-width: 40ch; letter-spacing: -0.015em; }
.measure .strategy-pic { margin-top: 0; }
@media (min-width: 900px) {
  .measure { grid-template-columns: 5fr 7fr; column-gap: 6%; }
  .measure .strategy-pic { grid-column: 1 / -1; }
}
.loop .fill::after { background: var(--deep); }

/* Chelsea pair (owner's photographs) */
.bleed-pair .pair { display: grid; grid-template-columns: 535fr 886fr; gap: 12px; }
.bleed-pair .pair img { width: 100%; height: min(78svh, 50vw); object-fit: cover; }
@media (max-width: 600px) { .bleed-pair .pair { grid-template-columns: 1fr; } .bleed-pair .pair img { height: auto; aspect-ratio: 4 / 3; } }

/* price quotes, static */
.price .voters li { grid-template-columns: 1fr; padding: calc(var(--u) * 2.5); }
.price .v-say { grid-column: 1; }
.price-head { align-self: start; }
@media (max-width: 600px) { .h-insight { font-size: 9.6vw; } }

.ch-logo { position: relative; width: 171px; height: auto; margin-top: calc(var(--u) * 2); }


/* compare: numbers first, heading below */
.compare { padding-block: var(--sec); }
.compare .spec { margin-bottom: calc(var(--u) * 12); }
.compare .spec-box { height: auto; overflow: visible; }
.compare-head { margin-bottom: 0; }
@media (max-width: 600px) { .compare .spec-box { height: auto; } .compare .spec-box:last-child { margin-inline: 0; padding: 0; background: none; color: var(--ink); } .compare .spec-box:last-child .spec-num { color: var(--deep); } }