/* ==========================================================================
   So'rah — immersive case study (Pixilated)
   Design system + shell. Look taken from the Figma case presentation
   (J0BOMDGJAoWS1368EwyjaR · 0:3111) and the brand guidelines
   (pbU865eMOIpFOGxttKJeDD · 678:2). Sizes follow the 1920px Figma canvas and
   scale with the window (1 figma px = 100vw / 1920), clamped for small screens.
   ========================================================================== */

:root {
  /* Brand palette (Figma fills) */
  --s-green: #159E17;        /* "Icons/Buttons" card, accents in the case deck */
  --s-brand: #17B21A;        /* brand guidelines swatch */
  --s-forest: #0B4907;       /* brand guidelines swatch */
  --s-lime: #8DDB1D;         /* brand guidelines swatch */
  --s-lime-2: #BBEF54;       /* case deck highlights */
  --s-mint: #E6FFE2;         /* case deck soft panel */
  --s-sage: #E7F0E7;         /* process panel */
  --s-night: #071E04;        /* case deck dark panels */
  --s-night-2: #0C2A07;
  --s-ink: #181818;          /* "Text primary color" */
  --s-grey: #747474;         /* secondary copy */
  --s-paper: #F6F6F6;        /* light panels */
  --s-white: #FFFFFF;
  --s-error: #D60000;
  --s-sun: #F6D523;
  --grad-brand: linear-gradient(135deg, #8DDB1D 0%, #17B21A 100%);
  --grad-zest: linear-gradient(135deg, #F4FF5E 0%, #8DDB1D 55%, #17B21A 100%);
  --grad-sora: linear-gradient(90deg, #F2C48D 0%, #EE6A6A 30%, #E9A271 52%, #2FA53E 75%, #3CC8A8 100%);

  /* Semantic (overridden per theme) */
  --bg: var(--s-white);
  --fg: var(--s-ink);
  --fg-soft: #747474;
  --line: rgba(24, 24, 24, .12);
  --tile: rgba(24, 24, 24, .045);  /* info tiles: fill, no stroke */
  --accent: var(--s-green);

  /* Type */
  --font: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --font-ar: "IBM Plex Sans Arabic", "IBM Plex Sans", sans-serif;

  /* figma px → fluid */
  --fx: calc(100vw / 1920);
  --t-mega: clamp(60px, calc(260 * var(--fx)), 260px);
  --t-display: clamp(46px, calc(140 * var(--fx)), 140px);
  --t-h1: clamp(38px, calc(96 * var(--fx)), 96px);
  --t-h2: clamp(30px, calc(64 * var(--fx)), 64px);
  --t-h3: clamp(23px, calc(40 * var(--fx)), 40px);
  --t-h4: clamp(19px, calc(30 * var(--fx)), 30px);
  --t-lead: clamp(18px, calc(32 * var(--fx)), 32px);
  --t-body: clamp(16px, calc(21 * var(--fx)), 21px);
  --t-small: clamp(14px, calc(18 * var(--fx)), 18px);
  --t-micro: clamp(12px, calc(14 * var(--fx)), 14px);

  /* Space */
  --edge: clamp(10px, calc(36 * var(--fx)), 36px);     /* panel inset from the window edge */
  --gap: clamp(10px, calc(18 * var(--fx)), 18px);      /* gap between stacked panels */
  --gutter: clamp(20px, calc(150 * var(--fx)), 150px); /* text inset inside panels */
  --s-1: clamp(4px, calc(8 * var(--fx)), 8px);
  --s-2: clamp(8px, calc(16 * var(--fx)), 16px);
  --s-3: clamp(12px, calc(24 * var(--fx)), 24px);
  --s-4: clamp(16px, calc(32 * var(--fx)), 32px);
  --s-5: clamp(24px, calc(48 * var(--fx)), 48px);
  --s-6: clamp(32px, calc(72 * var(--fx)), 72px);
  --s-7: clamp(48px, calc(110 * var(--fx)), 110px);
  --s-8: clamp(64px, calc(160 * var(--fx)), 160px);

  --r-chip: 999px;
  --r-card: clamp(16px, calc(28 * var(--fx)), 28px);
  --r-panel: clamp(22px, calc(44 * var(--fx)), 44px);

  --ease: cubic-bezier(.16, 1, .3, 1);
  --ease-io: cubic-bezier(.65, 0, .35, 1);
  --ease-back: cubic-bezier(.34, 1.56, .64, 1);
  --bar-h: clamp(62px, calc(92 * var(--fx)), 92px);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: auto; background: var(--s-white); }
body {
  margin: 0; background: var(--s-white); color: var(--s-ink);
  font-family: var(--font); font-size: var(--t-body); line-height: 1.55; font-weight: 400;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; overflow-x: clip;
}
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
::selection { background: var(--s-lime); color: var(--s-night); }
:focus-visible { outline: 2.5px solid var(--s-green); outline-offset: 3px; border-radius: 6px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: fixed; left: 12px; top: 12px; z-index: 200; padding: .7em 1em; border-radius: 10px; background: var(--s-night); color: #fff; transform: translateY(-160%); transition: transform .3s; }
.skip:focus { transform: none; }

/* ---------- view transitions between chapters ---------- */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: vt-out .45s var(--ease-io) both; }
::view-transition-new(root) { animation: vt-in .75s var(--ease) both; }
@keyframes vt-out { to { opacity: 0; transform: scale(.985); filter: blur(6px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(24px); } }
::view-transition-group(chapter-title) { animation-duration: .7s; animation-timing-function: var(--ease); }

/* ---------- type (Figma: IBM Plex Sans; regular/light lines with bold words and green italic accents) ---------- */
.t-mega { font: 600 var(--t-mega)/.88 var(--font); letter-spacing: -.045em; }
.t-display { font: 300 var(--t-display)/.98 var(--font); letter-spacing: -.035em; }
.t-h1 { font: 300 var(--t-h1)/1.04 var(--font); letter-spacing: -.028em; }
.t-h2 { font: 400 var(--t-h2)/1.1 var(--font); letter-spacing: -.022em; }
.t-h3 { font: 600 var(--t-h3)/1.18 var(--font); letter-spacing: -.012em; }
.t-h4 { font: 600 var(--t-h4)/1.25 var(--font); letter-spacing: -.008em; }
.t-lead { font-size: var(--t-lead); line-height: 1.38; font-weight: 400; letter-spacing: -.01em; }
.t-small { font-size: var(--t-small); line-height: 1.5; }
.t-micro { font-size: var(--t-micro); line-height: 1.4; }
.t-mono { font-family: var(--font-mono); letter-spacing: 0; }
.t-eyebrow { font: 600 var(--t-micro)/1.2 var(--font); letter-spacing: .16em; text-transform: uppercase; }
.t-soft { color: var(--fg-soft); }
.t-ar { font-family: var(--font-ar); direction: rtl; unicode-bidi: isolate; }
.t-display b, .t-h1 b, .t-h2 b, .t-lead b, .t-mega b { font-weight: 700; color: var(--fg); }
em.g, .g { font-style: italic; font-weight: 700; color: var(--accent); letter-spacing: -.02em; }
.t-dim { color: var(--fg-soft); }     /* Figma: grey sentence, black bold keywords */
.t-dim b { color: var(--fg); }
.balance { text-wrap: balance; }
.pretty { text-wrap: pretty; }
.num { font-variant-numeric: tabular-nums; }

/* ---------- themes ---------- */
.th-white { --bg: #fff; --fg: var(--s-ink); --fg-soft: #747474; --line: rgba(24,24,24,.12); --tile: rgba(24,24,24,.045); --accent: var(--s-green); }
.th-paper { --bg: var(--s-paper); --fg: var(--s-ink); --fg-soft: #747474; --line: rgba(24,24,24,.12); --tile: #fff; --accent: var(--s-green); }
.th-sage  { --bg: var(--s-sage); --fg: var(--s-ink); --fg-soft: #5f6b5f; --line: rgba(11,73,7,.16); --tile: rgba(255,255,255,.62); --accent: var(--s-green); }
.th-mint  { --bg: var(--s-mint); --fg: var(--s-ink); --fg-soft: #4f6a4f; --line: rgba(11,73,7,.16); --tile: rgba(255,255,255,.7); --accent: var(--s-green); }
.th-night { --bg: var(--s-night); --fg: #fff; --fg-soft: rgba(255,255,255,.66); --line: rgba(255,255,255,.14); --tile: rgba(255,255,255,.06); --accent: var(--s-lime); }
.th-forest{ --bg: var(--s-forest); --fg: #fff; --fg-soft: rgba(255,255,255,.72); --line: rgba(255,255,255,.18); --tile: rgba(255,255,255,.08); --accent: var(--s-lime); }
.th-green { --bg: var(--s-green); --fg: #fff; --fg-soft: rgba(255,255,255,.82); --line: rgba(255,255,255,.24); --tile: rgba(255,255,255,.12); --accent: var(--s-lime-2); }
.th-lime  { --bg: var(--s-lime); --fg: var(--s-forest); --fg-soft: rgba(11,73,7,.78); --line: rgba(11,73,7,.2); --tile: rgba(255,255,255,.28); --accent: var(--s-forest); }
.th-ink   { --bg: #000; --fg: #fff; --fg-soft: rgba(255,255,255,.66); --line: rgba(255,255,255,.14); --tile: rgba(255,255,255,.06); --accent: var(--s-lime); }
[class*="th-"] { background: var(--bg); color: var(--fg); }

/* ---------- layout: the Figma deck is a stack of rounded panels ---------- */
main { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--gap); padding: 0 var(--edge) var(--gap); }
.panel { position: relative; border-radius: var(--r-panel); overflow: clip; isolation: isolate; }
.sec { position: relative; padding-block: var(--s-8); }
.sec--tight { padding-block: var(--s-7); }
.sec--screen { min-height: calc(100svh - var(--gap) * 2); display: flex; flex-direction: column; justify-content: center; }
.bleed { margin-inline: calc(var(--edge) * -1); border-radius: 0; }
.wrap { padding-inline: var(--gutter); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-5); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-3); }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--s-7); align-items: start; }
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }   /* two panels side by side (Figma bento) */
.stack > * + * { margin-top: var(--s-3); }
.stack-lg > * + * { margin-top: var(--s-5); }
.measure { max-width: 44ch; }
.measure-wide { max-width: 62ch; }
@media (max-width: 900px) {
  .grid-2, .grid-3, .split, .duo { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* section head */
.hd { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--s-5); margin-bottom: var(--s-6); flex-wrap: wrap; }
.hd__title { flex: 1 1 32rem; max-width: min(100%, 60rem); }
.hd__aside { max-width: 46ch; color: var(--fg-soft); }
.sec-num { display: inline-flex; align-items: center; gap: .6em; font: 600 var(--t-micro)/1 var(--font); letter-spacing: .14em; text-transform: uppercase; color: var(--fg-soft); margin-bottom: var(--s-3); }
.sec-num::before { content: ""; width: 1.8em; height: 1.5px; background: currentColor; opacity: .6; }

/* ---------- pointer tag: the Figma multiplayer-cursor label the deck uses everywhere ---------- */
.ptr { --pc: var(--s-green); --pt: #fff; position: relative; display: inline-flex; align-items: flex-start; gap: 0; pointer-events: none; filter: drop-shadow(0 6px 14px rgba(7,30,4,.22)); }
.ptr__arrow { width: clamp(16px, calc(28 * var(--fx)), 28px); height: auto; flex: none; transform: translate(0, -42%); }
.ptr__arrow path { fill: var(--pc); stroke: #fff; stroke-width: 2.2; stroke-linejoin: round; }
.ptr__label { margin-top: clamp(8px, calc(14 * var(--fx)), 14px); margin-left: -2px; padding: .48em .95em; border-radius: 999px; background: var(--pc); color: var(--pt); box-shadow: inset 0 0 0 2px rgba(255,255,255,.95); font: 600 clamp(12px, calc(17 * var(--fx)), 17px)/1 var(--font); white-space: nowrap; }
.ptr--lime { --pc: var(--s-lime); --pt: var(--s-forest); }
.ptr--night { --pc: var(--s-night); }
.ptr--dark { --pc: var(--s-forest); }
.ptr--flip { flex-direction: row-reverse; }
.ptr--flip .ptr__arrow { transform: translate(0, -42%) scaleX(-1); }
.ptr--flip .ptr__label { margin-left: 0; margin-right: -2px; }
.js .ptr[data-reveal] { transform: translate(-14px, 14px) scale(.85); opacity: 0; transition: transform .9s var(--ease-back), opacity .5s; }
.js .ptr[data-reveal].is-in { transform: none; opacity: 1; }

/* ---------- chips / tags (Figma: rounded pills) ---------- */
.chip {
  display: inline-flex; align-items: center; gap: .5em; white-space: nowrap;
  padding: .55em 1.05em; border-radius: var(--r-chip);
  font: 500 clamp(13px, calc(18 * var(--fx)), 18px)/1.1 var(--font);
  background: var(--tile); color: var(--fg);
  transition: background .25s, color .25s, transform .35s var(--ease), box-shadow .35s;
}
.th-paper .chip, .th-white .chip { background: #ECECEC; }
a.chip, button.chip { cursor: pointer; box-shadow: inset 0 0 0 1.5px var(--line); background: transparent; }
a.chip:hover, button.chip:hover { transform: translateY(-2px); box-shadow: inset 0 0 0 1.5px var(--fg); }
.chip.is-active, .chip[aria-current="true"], .chip[aria-pressed="true"], .chip[aria-selected="true"] { background: var(--fg); color: var(--bg); box-shadow: none; }
.chip--lime { background: var(--s-lime-2) !important; color: var(--s-forest) !important; font-weight: 600; }
.chip--green { background: var(--s-green) !important; color: #fff !important; font-weight: 600; }
.chip--glass { background: rgba(255,255,255,.18) !important; color: #fff; -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }
.chips { display: flex; flex-wrap: wrap; gap: clamp(8px, calc(14 * var(--fx)), 14px); }
.chips--center { justify-content: center; }

/* ---------- buttons / interactive surfaces (stroke = state) ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .6em; padding: .95em 1.5em; border-radius: 14px;
  font: 600 var(--t-small)/1 var(--font); background: var(--s-lime); color: var(--s-night);
  transition: transform .35s var(--ease), background .25s, box-shadow .35s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -14px rgba(21,158,23,.7); }
.btn svg { width: 1.05em; }
.btn--dark { background: var(--s-night); color: #fff; }
.btn--ghost { background: transparent; color: var(--fg); box-shadow: inset 0 0 0 1.5px var(--line); }
.btn--ghost:hover { box-shadow: inset 0 0 0 1.5px var(--fg); }
.ctrl {
  border-radius: 14px; box-shadow: inset 0 0 0 1.5px var(--line); padding: .7em 1em; text-align: left;
  transition: box-shadow .25s, background .25s, color .25s, transform .3s var(--ease);
}
.ctrl:hover { box-shadow: inset 0 0 0 1.5px var(--fg); }
.ctrl[aria-pressed="true"], .ctrl[aria-selected="true"], .ctrl.is-active { background: var(--fg); color: var(--bg); box-shadow: none; }
.seg { display: inline-flex; padding: 4px; gap: 4px; border-radius: 14px; box-shadow: inset 0 0 0 1.5px var(--line); }
.seg button { padding: .55em 1em; border-radius: 10px; font: 500 var(--t-small)/1 var(--font); color: var(--fg-soft); transition: background .25s, color .25s; }
.seg button:hover { color: var(--fg); }
.seg button[aria-selected="true"], .seg button[aria-pressed="true"], .seg button[aria-checked="true"] { background: var(--fg); color: var(--bg); }

/* info tile: light fill, NO stroke */
.tile { background: var(--tile); border-radius: var(--r-card); padding: var(--s-4); }
.check-list { display: grid; gap: var(--s-3); }
.check-list li { display: grid; grid-template-columns: auto 1fr; gap: var(--s-3); align-items: center; }
.check-list li::before { content: ""; width: clamp(34px, calc(54 * var(--fx)), 54px); aspect-ratio: 1; border-radius: 12px; background: var(--s-lime-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5' fill='none' stroke='%23071E04' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/58% no-repeat; }
.dot-list { display: grid; gap: .6em; }
.dot-list li { position: relative; padding-left: 1.3em; }
.dot-list li::before { content: ""; position: absolute; left: 0; top: .62em; width: .48em; height: .48em; border-radius: 3px; transform: rotate(45deg); background: var(--accent); }

/* quote bubble (Figma: avatar circle + italic line on a tile) */
.quote { display: grid; grid-template-columns: auto 1fr; gap: var(--s-3); align-items: center; }
.quote__av { width: clamp(44px, calc(68 * var(--fx)), 68px); aspect-ratio: 1; border-radius: 50%; background: var(--s-mint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3Ccircle cx='32' cy='25' r='11' fill='%2342B43C'/%3E%3Cpath d='M12 56c2-11 10-17 20-17s18 6 20 17' fill='%2342B43C'/%3E%3C/svg%3E") center/70% no-repeat; }
.quote p { font-style: italic; font-size: var(--t-small); line-height: 1.4; }

/* stat */
.stat__v { font: 700 clamp(44px, calc(110 * var(--fx)), 110px)/.95 var(--font); letter-spacing: -.04em; color: var(--accent); font-variant-numeric: tabular-nums; }
.stat__l { margin-top: .45em; font-size: var(--t-small); color: var(--fg-soft); max-width: 26ch; }
.stat__l b { color: var(--fg); }

/* ---------- top bar ---------- */
.bar {
  position: fixed; inset: 0 0 auto 0; z-index: 60; height: var(--bar-h);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--s-3);
  padding-inline: calc(var(--edge) + var(--s-4));
  color: var(--s-ink); pointer-events: none; transition: color .4s, transform .5s var(--ease);
}
.bar > * { pointer-events: auto; }
.bar.on-dark { color: #fff; }
.bar.is-hidden { transform: translateY(-115%); }
.bar__logo { display: inline-flex; align-items: center; justify-self: start; color: var(--s-forest); transition: color .4s; }
.bar.on-dark .bar__logo { color: #fff; }
.bar__logo svg { height: clamp(30px, calc(46 * var(--fx)), 46px); width: auto; transition: transform .6s var(--ease); }
.bar__logo:hover svg { transform: scale(1.05); }
.bar__right { justify-self: end; display: flex; align-items: center; gap: var(--s-3); font-size: var(--t-micro); }
.bar__credit b { font-weight: 700; }
.bar__menu, .bar__back {
  display: inline-flex; align-items: center; gap: .6em; padding: .65em 1.05em; border-radius: 999px;
  background: rgba(255,255,255,.62); -webkit-backdrop-filter: blur(16px) saturate(1.3); backdrop-filter: blur(16px) saturate(1.3);
  box-shadow: inset 0 0 0 1px rgba(24,24,24,.14); font: 600 var(--t-micro)/1 var(--font); letter-spacing: .02em;
  transition: background .3s, box-shadow .3s, color .3s;
}
.bar.on-dark .bar__menu, .bar.on-dark .bar__back { background: rgba(255,255,255,.12); box-shadow: inset 0 0 0 1px rgba(255,255,255,.28); }
.bar__menu:hover, .bar__back:hover { box-shadow: inset 0 0 0 1px currentColor; }
.bar__menu i { display: grid; gap: 3px; }
.bar__menu i::before, .bar__menu i::after { content: ""; width: 14px; height: 1.5px; background: currentColor; border-radius: 2px; }
.bar__back svg { width: 1em; transition: transform .35s var(--ease); }
.bar__back:hover svg { transform: translateX(-3px); }

/* process stepper (centre of the bar): the 3 phases from the Figma process diagram */
.steps { display: flex; align-items: center; gap: clamp(10px, calc(22 * var(--fx)), 22px); padding: .5em .9em; border-radius: 999px; background: rgba(255,255,255,.62); -webkit-backdrop-filter: blur(16px) saturate(1.3); backdrop-filter: blur(16px) saturate(1.3); box-shadow: inset 0 0 0 1px rgba(24,24,24,.1); }
.bar.on-dark .steps { background: rgba(255,255,255,.1); box-shadow: inset 0 0 0 1px rgba(255,255,255,.2); }
.steps__ph { display: flex; align-items: center; gap: 6px; }
.steps__ph > span { font: 600 11px/1 var(--font); letter-spacing: .08em; text-transform: uppercase; opacity: .55; margin-right: 4px; white-space: nowrap; }
.steps__ph.is-on > span { opacity: 1; color: var(--s-green); }
.bar.on-dark .steps__ph.is-on > span { color: var(--s-lime); }
.steps a { position: relative; width: 9px; height: 9px; border-radius: 50%; background: currentColor; opacity: .22; transition: opacity .3s, transform .4s var(--ease-back), background .3s; }
.steps a:hover { opacity: .7; transform: scale(1.35); }
.steps a.is-done { opacity: .55; }
.steps a[aria-current="page"] { opacity: 1; background: var(--s-green); transform: scale(1.5); box-shadow: 0 0 0 3px rgba(141,219,29,.35); }
.bar.on-dark .steps a[aria-current="page"] { background: var(--s-lime); }
.steps a span { position: absolute; top: calc(100% + 12px); left: 50%; transform: translate(-50%, -4px); white-space: nowrap; padding: .45em .75em; border-radius: 8px; background: var(--s-night); color: #fff; font: 600 12px/1 var(--font); opacity: 0; pointer-events: none; transition: .25s var(--ease); }
.steps a:hover span, .steps a:focus-visible span { opacity: 1; transform: translate(-50%, 0); }
@media (max-width: 1100px) { .steps__ph > span { display: none; } }
@media (max-width: 760px) { .steps, .bar__credit { display: none; } .bar { grid-template-columns: 1fr auto; } }

/* scroll progress */
.progress { position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 70; transform-origin: 0 50%; transform: scaleX(var(--p, 0)); background: var(--grad-brand); }

/* ---------- chapter index overlay ---------- */
.index {
  position: fixed; inset: 0; z-index: 90; display: grid; grid-template-rows: auto 1fr auto; gap: var(--s-4); padding: var(--s-5) calc(var(--edge) + var(--s-5));
  background: rgba(7,30,4,.9); -webkit-backdrop-filter: blur(30px) saturate(1.3); backdrop-filter: blur(30px) saturate(1.3);
  color: #fff; opacity: 0; visibility: hidden; transition: opacity .5s var(--ease), visibility 0s .5s; overflow-y: auto; overscroll-behavior: contain;
}
.index.is-open { opacity: 1; visibility: visible; transition: opacity .5s var(--ease); }
.index__top { display: flex; justify-content: space-between; align-items: center; gap: var(--s-3); }
.index__close { display: inline-flex; align-items: center; gap: .6em; padding: .65em 1.05em; border-radius: 999px; box-shadow: inset 0 0 0 1px rgba(255,255,255,.3); font: 600 var(--t-micro)/1 var(--font); }
.index__close:hover { background: rgba(255,255,255,.12); }
.index__cols { align-self: center; display: grid; grid-template-columns: 1.25fr 1fr .8fr; gap: var(--s-6); }
.index__ph > p { font: 600 var(--t-micro)/1 var(--font); letter-spacing: .16em; text-transform: uppercase; color: var(--s-lime); margin-bottom: var(--s-3); display: flex; gap: .7em; align-items: center; }
.index__ph > p small { font: inherit; color: rgba(255,255,255,.5); }
.index__item {
  display: grid; grid-template-columns: 2.4em 1fr auto; align-items: center; gap: var(--s-2);
  padding: clamp(10px, calc(16 * var(--fx)), 16px) 0; border-bottom: 1px solid rgba(255,255,255,.12);
  font: 500 clamp(19px, calc(32 * var(--fx)), 32px)/1.1 var(--font); letter-spacing: -.015em;
  opacity: 0; transform: translateY(18px); transition: color .25s, padding .4s var(--ease);
}
.index.is-open .index__item { opacity: 1; transform: none; transition: opacity .6s var(--ease) calc(var(--i) * 40ms + 100ms), transform .7s var(--ease) calc(var(--i) * 40ms + 100ms), color .25s, padding .4s var(--ease); }
.index__item small { font: 500 var(--t-micro)/1 var(--font-mono); color: rgba(255,255,255,.5); }
.index__item em { display: block; font: 400 var(--t-micro)/1.3 var(--font); font-style: normal; color: rgba(255,255,255,.55); margin-top: .35em; letter-spacing: 0; }
.index__item .arrow { width: 1em; opacity: 0; transform: translateX(-10px); transition: .35s var(--ease); }
.index__item:hover { color: var(--s-lime-2); padding-left: .35em; }
.index__item:hover .arrow { opacity: 1; transform: none; }
.index__item[aria-current="page"] { color: var(--s-lime); }
.index__peek { position: fixed; z-index: -1; width: min(30vw, 460px); aspect-ratio: 4/3; border-radius: var(--r-card); overflow: hidden; pointer-events: none; opacity: 0; transform: scale(.9) rotate(-3deg); transition: opacity .35s, transform .5s var(--ease); left: 0; top: 0; background: var(--s-paper); }
.index__peek.is-on { opacity: .95; transform: scale(1) rotate(-3deg); }
.index__peek img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 1000px) { .index__cols { grid-template-columns: 1fr; gap: var(--s-4); } .index__peek { display: none; } }

/* ---------- chapter hero ---------- */
.ch-hero { position: relative; min-height: calc(100svh - var(--gap)); margin-top: 0; display: grid; align-items: end; padding: calc(var(--bar-h) + var(--s-6)) var(--gutter) var(--s-6); border-radius: 0 0 var(--r-panel) var(--r-panel); overflow: clip; isolation: isolate; }
.ch-hero__glow { position: absolute; inset: -10%; z-index: -2; pointer-events: none; }
.ch-hero__glow i { position: absolute; border-radius: 50%; filter: blur(clamp(50px, 7vw, 120px)); opacity: .75; will-change: transform; }
.ch-hero__glow i:nth-child(1) { width: 46vw; height: 46vw; left: 4%; top: 6%; background: #C8F27A; animation: drift-a 18s var(--ease-io) infinite alternate; }
.ch-hero__glow i:nth-child(2) { width: 38vw; height: 38vw; right: 2%; top: 14%; background: #9DF0E4; animation: drift-b 22s var(--ease-io) infinite alternate; }
.ch-hero__glow i:nth-child(3) { width: 30vw; height: 30vw; left: 40%; bottom: -4%; background: #F9D3A8; opacity: .55; animation: drift-c 26s var(--ease-io) infinite alternate; }
.th-night .ch-hero__glow i, .ch-hero.th-night .ch-hero__glow i { opacity: .38; }
.th-night .ch-hero__glow i:nth-child(1) { background: #2FBF2A; }
.th-night .ch-hero__glow i:nth-child(2) { background: #0F6B12; }
.th-night .ch-hero__glow i:nth-child(3) { background: #8DDB1D; opacity: .22; }
@keyframes drift-a { to { transform: translate(8vw, 6vh) scale(1.12); } }
@keyframes drift-b { to { transform: translate(-10vw, 8vh) scale(.9); } }
@keyframes drift-c { to { transform: translate(-6vw, -10vh) scale(1.2); } }
.ch-hero__lines { position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .5;
  background: repeating-linear-gradient(180deg, transparent 0 calc(18vh - 1px), var(--line) calc(18vh - 1px) 18vh); -webkit-mask: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent); mask: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent); }
.ch-hero__in { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: var(--s-6); align-items: end; }
.ch-hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); margin-bottom: var(--s-4); }
.ch-hero__num { font: 500 var(--t-small)/1 var(--font-mono); color: var(--fg-soft); }
.ch-hero__title { view-transition-name: chapter-title; font: 300 var(--t-display)/.96 var(--font); letter-spacing: -.04em; max-width: 12ch; }
.ch-hero__title b { font-weight: 700; }
.ch-hero__title em { font-style: italic; font-weight: 700; color: var(--accent); }
.ch-hero__lead { margin-top: var(--s-4); max-width: 40ch; font-size: var(--t-lead); line-height: 1.38; color: var(--fg-soft); }
.ch-hero__lead b { color: var(--fg); font-weight: 600; }
.ch-hero__chips { margin-top: var(--s-5); }
.ch-hero__media { position: relative; justify-self: end; width: 100%; max-width: 760px; }
.ch-hero__media img { width: 100%; height: auto; filter: drop-shadow(0 40px 60px rgba(7,30,4,.22)); will-change: transform; }
.ch-hero__media .ptr { position: absolute; }
.ch-hero__cue { position: absolute; left: 50%; bottom: var(--s-3); transform: translateX(-50%); font: 600 var(--t-micro)/1 var(--font); letter-spacing: .14em; text-transform: uppercase; color: var(--fg-soft); display: grid; justify-items: center; gap: .8em; }
.ch-hero__cue::after { content: ""; width: 1.5px; height: 34px; background: linear-gradient(currentColor, transparent); animation: cue 2.2s var(--ease) infinite; transform-origin: top; }
@keyframes cue { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); } 100% { transform: scaleY(1); opacity: 0; } }
@media (max-width: 900px) { .ch-hero__in { grid-template-columns: 1fr; } .ch-hero__media { justify-self: start; max-width: 520px; } .ch-hero { align-items: center; } }

/* ---------- section rail (right) ---------- */
.rail { position: fixed; right: clamp(10px, 1.4vw, 24px); top: 50%; transform: translateY(-50%); z-index: 55; display: grid; gap: 10px; color: var(--rail-c, var(--s-ink)); }
.rail a { position: relative; display: block; width: 10px; height: 10px; }
.rail a::before { content: ""; position: absolute; inset: 2px; border-radius: 50%; background: currentColor; opacity: .3; transition: opacity .3s, inset .3s var(--ease), background .3s; }
.rail a.is-active::before { opacity: 1; inset: -1px; background: var(--s-green); box-shadow: 0 0 0 3px rgba(141,219,29,.35); }
.rail a span { position: absolute; right: 22px; top: 50%; transform: translate(6px, -50%); white-space: nowrap; padding: .4em .75em; border-radius: 8px; font: 600 12px/1 var(--font); background: var(--s-night); color: #fff; opacity: 0; pointer-events: none; transition: .3s var(--ease); }
.rail a:hover span, .rail a:focus-visible span { opacity: 1; transform: translate(0, -50%); }
@media (max-width: 900px) { .rail { display: none; } }

/* ---------- chapter footer: big "next step" panel ---------- */
.ch-foot { display: grid; grid-template-columns: 1fr 2fr; gap: var(--gap); padding: 0 var(--edge) var(--gap); }
.ch-foot a { position: relative; display: grid; align-content: space-between; gap: var(--s-5); min-height: clamp(220px, calc(420 * var(--fx)), 420px); padding: var(--s-6) var(--s-6); border-radius: var(--r-panel); overflow: hidden; isolation: isolate; transition: transform .6s var(--ease); }
.ch-foot a:first-child { background: var(--s-paper); color: var(--s-ink); }
.ch-foot a:last-child { background: var(--s-night); color: #fff; }
.ch-foot a:hover { transform: translateY(-4px); }
.ch-foot small { font: 600 var(--t-micro)/1 var(--font); letter-spacing: .14em; text-transform: uppercase; opacity: .7; display: flex; gap: .8em; }
.ch-foot strong { display: flex; align-items: flex-end; justify-content: space-between; gap: .45em; font: 300 var(--t-h1)/1 var(--font); letter-spacing: -.03em; }
.ch-foot a:first-child strong { font-size: var(--t-h3); font-weight: 500; }
.ch-foot strong svg { width: .7em; flex: none; transition: transform .45s var(--ease); }
.ch-foot a:last-child::before { content: ""; position: absolute; inset: auto -10% -60% 30%; height: 120%; border-radius: 50%; z-index: -1; background: radial-gradient(closest-side, rgba(141,219,29,.55), transparent); transition: transform .8s var(--ease); }
.ch-foot a:last-child:hover::before { transform: translateY(-12%) scale(1.1); }
.ch-foot a:first-child:hover svg { transform: translateX(-8px); }
.ch-foot a:last-child:hover svg { transform: translateX(10px); }
.ch-foot__thumb { position: absolute; right: var(--s-5); top: var(--s-5); width: clamp(120px, 22%, 300px); aspect-ratio: 4/3; border-radius: var(--r-card); overflow: hidden; opacity: .9; transform: rotate(4deg); transition: transform .7s var(--ease); }
.ch-foot a:hover .ch-foot__thumb { transform: rotate(0) scale(1.04); }
.ch-foot__thumb img { width: 100%; height: 100%; object-fit: cover; }
.site-foot { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); flex-wrap: wrap; padding: var(--s-4) calc(var(--edge) + var(--s-4)) var(--s-5); font-size: var(--t-micro); color: var(--s-grey); }
.site-foot b { color: var(--s-ink); }
.site-foot .px { display: inline-flex; align-items: center; gap: .45em; color: var(--s-ink); }
.site-foot .px svg { height: 1.25em; width: auto; color: #F40B48; }
@media (max-width: 760px) { .ch-foot { grid-template-columns: 1fr; } .ch-foot__thumb { display: none; } }

/* ---------- reveal (JS adds .is-in; no-JS shows everything) ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(32px); transition: opacity 1s var(--ease), transform 1.1s var(--ease); transition-delay: calc(var(--d, 0) * 1ms); }
.js [data-reveal].is-in { opacity: 1; transform: none; }
.js [data-reveal="scale"] { transform: scale(.94); }
.js [data-reveal="left"] { transform: translateX(-40px); }
.js [data-reveal="right"] { transform: translateX(40px); }
.js [data-reveal="pop"] { transform: scale(.6) rotate(-6deg); transition: opacity .6s var(--ease), transform .9s var(--ease-back); transition-delay: calc(var(--d, 0) * 1ms); }
.split-line { display: block; overflow: hidden; padding-bottom: .08em; margin-bottom: -.08em; }
.split-line > span { display: inline-block; will-change: transform; }

/* paragraphs that brighten word by word as they pass the middle (Figma: grey text, black keywords) */
.story .w { color: var(--fg); opacity: .22; transition: opacity .35s linear; }
.story .w.on { opacity: 1; }
.story b .w, .story .w b { font-weight: 700; }

/* ---------- cursor label (the system cursor is never hidden) ---------- */
.cursor { position: fixed; left: 0; top: 0; z-index: 130; pointer-events: none; }
.cursor__label { position: absolute; left: 18px; top: 20px; white-space: nowrap; padding: .45em .8em; border-radius: 999px; background: var(--s-green); color: #fff; box-shadow: inset 0 0 0 2px #fff, 0 6px 14px rgba(7,30,4,.22); font: 600 12px/1 var(--font); opacity: 0; transform: scale(.7); transform-origin: 0 0; transition: opacity .2s, transform .3s var(--ease-back); }
.cursor.has-label .cursor__label { opacity: 1; transform: none; }
@media (hover: none), (pointer: coarse) { .cursor { display: none; } }

/* ---------- toast ---------- */
.toast { position: fixed; left: 50%; bottom: 28px; z-index: 120; transform: translate(-50%, 20px); opacity: 0; padding: .85em 1.25em; border-radius: 999px; background: var(--s-night); color: #fff; font: 600 var(--t-small)/1 var(--font); box-shadow: 0 20px 40px -18px rgba(7,30,4,.7); transition: .45s var(--ease); pointer-events: none; display: flex; gap: .6em; align-items: center; }
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }
.toast i { width: 14px; height: 14px; border-radius: 4px; background: var(--sw, var(--s-green)); box-shadow: inset 0 0 0 1px rgba(255,255,255,.4); }

/* ---------- lightbox ---------- */
.lb { position: fixed; inset: 0; z-index: 110; display: grid; grid-template-rows: 1fr auto; place-items: center; gap: var(--s-3); padding: var(--s-5); background: rgba(4,14,2,.94); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); color: #fff; opacity: 0; visibility: hidden; transition: opacity .4s var(--ease), visibility 0s .4s; }
.lb.is-open { opacity: 1; visibility: visible; transition: opacity .4s var(--ease); }
.lb__stage { position: relative; width: 100%; height: 100%; overflow: hidden; display: grid; place-items: center; touch-action: none; }
.lb__stage img { max-width: 94vw; max-height: 80vh; border-radius: 14px; object-fit: contain; box-shadow: 0 40px 100px -30px #000; transform-origin: 0 0; user-select: none; -webkit-user-drag: none; }
.lb.is-zoomed .lb__stage img { max-width: none; max-height: none; border-radius: 0; cursor: grab; }
.lb__cap { display: flex; align-items: center; gap: var(--s-3); font-size: var(--t-small); max-width: 92vw; }
.lb__cap [data-cap] { opacity: .85; }
.lb__btn { width: 46px; height: 46px; flex: none; border-radius: 50%; display: grid; place-items: center; box-shadow: inset 0 0 0 1px rgba(255,255,255,.3); }
.lb__btn:hover { background: rgba(255,255,255,.12); }
.lb__btn svg { width: 18px; }
.lb__close { position: absolute; top: var(--s-4); right: var(--s-4); }
.lb__zoom { position: absolute; top: var(--s-4); left: var(--s-4); display: flex; gap: 8px; }

/* ---------- media helpers ---------- */
.media { position: relative; overflow: hidden; border-radius: var(--r-card); background: var(--tile); }
.media img, .media video { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.media--zoom:hover img { transform: scale(1.04); }
.media--contain img { object-fit: contain; }
.zoomable { cursor: zoom-in; }
.phone { position: relative; border-radius: clamp(22px, 2.6vw, 44px); overflow: hidden; background: #fff; box-shadow: 0 0 0 clamp(4px, .45vw, 8px) #111, 0 30px 60px -24px rgba(7,30,4,.45); }
.phone img { width: 100%; height: auto; }
.screen { border-radius: clamp(14px, 1.4vw, 26px); overflow: hidden; box-shadow: 0 24px 50px -26px rgba(7,30,4,.4), 0 0 0 1px rgba(24,24,24,.06); background: #fff; }
.screen img { width: 100%; height: auto; }

/* horizontal drag rail */
.drag { display: flex; gap: var(--s-3); overflow-x: auto; overscroll-behavior-x: contain; scroll-snap-type: x proximity; padding-bottom: var(--s-3); scrollbar-width: thin; cursor: grab; }
.drag > * { flex: none; scroll-snap-align: start; }
.drag.is-dragging { cursor: grabbing; scroll-snap-type: none; }
.drag.is-dragging * { pointer-events: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
  .story .w { opacity: 1; }
  .cursor { display: none; }
}