/* RoutineX · ห้อง B — Build (family of A; own pearl / copper / silver palette)
   ตัวอักษร: IBM Plex Sans Thai (self-hosted, OFL) */
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-thai-400.woff2') format('woff2');font-weight:400;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-thai-600.woff2') format('woff2');font-weight:600;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-thai-700.woff2') format('woff2');font-weight:700;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-latin-400.woff2') format('woff2');font-weight:400;font-display:swap;unicode-range:U+0000-024F,U+2000-206F,U+2190-21FF}
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-latin-600.woff2') format('woff2');font-weight:600;font-display:swap;unicode-range:U+0000-024F,U+2000-206F,U+2190-21FF}
@font-face{font-family:Plex;src:url('../fonts/ibm-plex-sans-thai-latin-700.woff2') format('woff2');font-weight:700;font-display:swap;unicode-range:U+0000-024F,U+2000-206F,U+2190-21FF}

:root{
  --paper:#f6efe4; --ink:#1b1714; --gold:#e9b530; --plum:#1c1116; --film:#140d0a;
  --fg-rgb:27 23 20; --bg-rgb:246 239 228; --accent-rgb:176 92 44;
  --gut:clamp(20px,7vw,120px);
  --font:Plex,'Noto Sans Thai','Sarabun','Thonburi','Leelawadee UI',system-ui,-apple-system,sans-serif;
  --vang:90deg; --va:0;
  font-family:var(--font);color:rgb(var(--fg-rgb));background:var(--paper);
  font-synthesis:none;-webkit-text-size-adjust:100%;text-size-adjust:100%;
}
*{box-sizing:border-box}
html{scroll-behavior:auto}
html,body{overscroll-behavior-y:none}
body{margin:0;background:var(--paper);color:rgb(var(--fg-rgb));font-family:var(--font);line-height:1.7;overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;cursor:pointer}
a{color:inherit}
h1,h2,h3,p,ol,ul,dl,dd,figure{margin:0;padding:0}
ol,ul{list-style:none}
[hidden]{display:none!important}
:focus-visible{outline:3px solid rgb(var(--accent-rgb));outline-offset:4px;border-radius:6px}
.dark :focus-visible{outline-color:#f4d9b0}
::selection{background:rgba(233,181,48,.4)}

.skip{position:fixed;left:16px;top:-80px;z-index:100;background:var(--ink);color:#fff;padding:12px 18px;border-radius:12px;text-decoration:none;font-weight:600;transition:top .2s}
.skip:focus{top:14px}
.skip--main{left:auto;right:16px}

/* ───────── fixed layers: stage (GL) < film < veil < grain ───────── */
#stage{position:fixed;inset:0;width:100%;height:100lvh;display:block;z-index:0;background:var(--paper)}
.film{position:fixed;inset:0;height:100lvh;z-index:0;pointer-events:none;overflow:hidden;background:var(--film);opacity:var(--fo,0);visibility:var(--fv,hidden);
  -webkit-mask-image:radial-gradient(ellipse 96% 104% at 64% 50%,#000 calc(var(--fo,0) * 80%),transparent calc(var(--fo,0) * 120%));
  mask-image:radial-gradient(ellipse 96% 104% at 64% 50%,#000 calc(var(--fo,0) * 80%),transparent calc(var(--fo,0) * 120%))}
.film video,.film__poster{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:64% 50%;display:block}
.film__poster:not([src]){display:none}
.film video{opacity:0;transition:opacity .4s}
.film.is-live video{opacity:1}
/* deterministic reading surface: cream type always sits on this scrim, whatever the footage does */
.film::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,12,10,.86) 0%,rgba(20,12,10,.6) 32%,rgba(20,12,10,.12) 62%,rgba(20,12,10,0) 78%)}
.veil{position:fixed;inset:0;z-index:1;pointer-events:none;background:linear-gradient(var(--vang),rgb(var(--bg-rgb) / var(--va)) 0%,rgb(var(--bg-rgb) / calc(var(--va)*.9)) 30%,rgb(var(--bg-rgb) / calc(var(--va)*.4)) 52%,rgb(var(--bg-rgb) / 0) 78%)}
.veil::after{content:"";position:absolute;inset:0;background:rgb(var(--bg-rgb) / .94);opacity:var(--closing,0)}
.grain{position:fixed;inset:0;z-index:2;pointer-events:none;opacity:.07;mix-blend-mode:multiply;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.dark .grain{mix-blend-mode:screen;opacity:.05}

.bar{position:fixed;z-index:20;left:0;right:0;top:0;display:flex;justify-content:space-between;align-items:center;padding:calc(14px + env(safe-area-inset-top)) clamp(16px,3vw,36px) 10px;pointer-events:none}
.bar>*{pointer-events:auto}
.bar__brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;font-size:14px;letter-spacing:.02em}
.bar__brand b{font-weight:400;opacity:.65}
.bar__mark{width:28px;height:30px;object-fit:contain;flex:none}
.bar__tools{display:flex;gap:8px}
.chip{border:1px solid rgb(var(--fg-rgb) / .28);background:rgb(var(--bg-rgb) / .42);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:999px;padding:7px 14px;font-size:13px;font-weight:600;line-height:1.3;min-height:36px;transition:background .2s,border-color .2s}
.chip:hover{background:rgb(var(--bg-rgb) / .75)}
.chip--quiet{background:transparent;text-decoration:none;display:inline-flex;align-items:center}
.chip--solid{background:rgb(var(--fg-rgb));color:rgb(var(--bg-rgb));border-color:transparent}
.chip--solid:hover{background:rgb(var(--fg-rgb));opacity:.86}
.chip[aria-pressed=true]{background:rgb(var(--accent-rgb));color:#fff;border-color:transparent}

.rail{position:fixed;z-index:15;right:clamp(10px,2vw,26px);top:50%;transform:translateY(-50%)}
.rail ol{display:flex;flex-direction:column;gap:2px;align-items:flex-end}
.rail a{display:flex;align-items:center;gap:9px;text-decoration:none;height:22px;font-size:11px;font-weight:600;letter-spacing:.03em}
.rail a span{opacity:0;transform:translateX(6px);transition:opacity .25s,transform .25s;white-space:nowrap;background:rgb(var(--bg-rgb) / .72);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:1px 9px;border-radius:99px}
.rail a::after{content:"";width:7px;height:7px;border-radius:50%;border:1.5px solid rgb(var(--fg-rgb));opacity:.5;transition:all .25s;flex:none}
.rail a:hover span,.rail a:focus-visible span{opacity:1;transform:none}
.rail a[aria-current=true]::after{background:rgb(var(--accent-rgb));border-color:rgb(var(--accent-rgb));opacity:1;transform:scale(1.35)}
.rail__bar{display:none}

/* ───────── story / pinned choreography ───────── */
#story{position:relative;z-index:5;outline:none}
.chapter{position:relative;height:calc(var(--len) * 1svh);height:calc(var(--len) * var(--unit-vh,1svh))}
.pin{position:sticky;top:0;height:var(--pinh,100svh);overflow:hidden;pointer-events:none}
.chapter+.chapter{margin-top:calc(-1 * var(--pinh,100svh))}
.js:not(.ready):not(.flow) #story{visibility:hidden}
.js:not(.flow) .chapter{pointer-events:none}
.beat{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:safe center;align-items:flex-start;gap:clamp(12px,2vh,22px);padding:calc(56px + 2vh) var(--gut) 6vh;opacity:var(--o,0);transform:translate3d(0,calc(var(--y,0) * 1px),0);pointer-events:none;visibility:var(--vis,hidden)}
.beat.on>*{pointer-events:auto}
.beat>*{max-width:min(34rem,100%)}
.beat[data-pos=l]{padding-right:52vw}
.beat[data-pos=r]{padding-left:54vw}
.beat[data-pos=c]{align-items:center;text-align:center;padding-left:var(--gut);padding-right:var(--gut)}
.beat[data-pos=c]>*{max-width:min(40rem,100%)}
.beat--hero{justify-content:flex-end;padding-bottom:16vh}
/* hidden chapters and beats leave the layout entirely */
.js:not(.flow) .chapter.is-dormant .pin{display:none}
.js:not(.flow) .beat{display:var(--beat-display,none)}
.flow .beat,html:not(.js) .beat{display:flex}

.kick{font-size:12px;letter-spacing:.2em;font-weight:600;text-transform:uppercase;color:rgb(var(--accent-rgb));line-height:1.6}
.dark .kick{color:#e9b45f}
.mega,.big,.mid{font-weight:700;letter-spacing:-.012em;text-wrap:balance}
.mega{font-size:clamp(44px,7.4vw,124px);line-height:1.2;letter-spacing:-.03em;max-width:none!important}
.big{font-size:clamp(38px,6vw,96px);line-height:1.24;max-width:none!important}
.mid{font-size:clamp(24px,3.1vw,42px);line-height:1.4}
.ln{display:block;--t:clamp(0,calc(var(--e,1) * (1 + var(--n,1) * .45) - var(--i,0) * .45),1);opacity:var(--t);transform:translate3d(0,calc((1 - var(--t)) * 26px),0);filter:blur(calc((1 - var(--t)) * 6px))}
.lede{font-size:clamp(17px,1.55vw,23px);line-height:1.75;color:rgb(var(--fg-rgb) / .88);text-wrap:pretty;max-width:30em!important}
.fine{font-size:13px;line-height:1.75;color:rgb(var(--fg-rgb) / .68);max-width:34em!important}
.tag{display:flex;align-items:flex-start;gap:9px;font-size:12.5px;line-height:1.65;color:rgb(var(--fg-rgb) / .74);border-top:1px solid rgb(var(--fg-rgb) / .2);padding-top:12px;max-width:30em!important}
.tag i{flex:none;width:7px;height:7px;margin-top:.55em;border-radius:50%;background:var(--gold)}
.hint{display:flex;align-items:center;gap:12px;font-size:13px;letter-spacing:.06em;opacity:.7}
.hint i{width:1px;height:38px;background:linear-gradient(rgb(var(--fg-rgb)),transparent);animation:hint 2.2s ease-in-out infinite}
@keyframes hint{0%{transform:scaleY(.2);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(.2);transform-origin:bottom}}
.dark .beat h1,.dark .beat h2,.dark .lede{text-shadow:0 1px 26px rgba(12,5,6,.65)}
.linkbtn{background:none;border:0;padding:0;font:inherit;color:inherit;text-decoration:underline;text-underline-offset:4px;font-weight:600;cursor:pointer;min-height:36px;display:inline-flex;align-items:center}

/* ───────── ch1 scale strip ───────── */
.scale{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:100%;max-width:30rem}
.scale li{display:grid;gap:2px;align-content:start;border-top:2px solid rgb(var(--accent-rgb));padding-top:10px;transition:opacity .4s}
.dark .scale li{border-color:#e9b45f}
.scale b{font-size:15px;line-height:1.35}
.scale span{font-size:12.5px;line-height:1.5;color:rgb(var(--fg-rgb) / .74)}
.scale i{display:block;height:16px;margin-bottom:4px}
.dotx{width:12px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff,#f4d9b0 55%,#d69557)}
.chainx{width:54px;background:radial-gradient(circle at 8px 8px,#f4d9b0 0 5px,transparent 6px) 0 0/14px 16px repeat-x}
.fibx{width:70px;background:repeating-linear-gradient(0deg,#c7803f 0 2px,transparent 2px 5px)}
.beat[data-ph="0"] .scale li:nth-child(n+2),.beat[data-ph="1"] .scale li:nth-child(n+3){opacity:.28}

/* ───────── ch2 turnover phases ───────── */
.phases{display:grid;gap:14px;width:100%;max-width:28rem}
.ph{display:grid;grid-template-columns:96px 1fr;column-gap:16px;align-items:center;opacity:.3;transition:opacity .35s}
.ph svg{grid-row:1/3;width:100%;max-width:96px;height:40px}
.ph b{font-size:clamp(24px,2.6vw,36px);line-height:1.25}
.ph span{font-size:14px;line-height:1.5;color:rgb(var(--fg-rgb) / .8)}
.ph--break b{color:#8b949e}
.dark .ph--break b{color:#c9d0d8}
.beat[data-ph="0"] .ph--build,.beat[data-ph="1"] .ph--break,.beat[data-ph="2"] .ph--again{opacity:1}
.beat:not([data-ph]) .ph{opacity:1}

/* ───────── ch4 concept figure ───────── */
.concept{width:100%;max-width:22rem;color:rgb(var(--fg-rgb))}
.concept svg{width:100%;height:auto;display:block;overflow:visible}
.concept figcaption{font-size:12px;line-height:1.6;color:rgb(var(--fg-rgb) / .7);margin-top:6px}
.cx-arc{stroke-dashoffset:calc(1 - clamp(0, calc(var(--bp,1) * 2 - .1), 1))}
.cx-hmb{opacity:calc(.2 + clamp(0, calc(var(--bp,1) * 2 - .3), 1) * .8)}
.concept + .flowfig{display:none!important}
.flowfig{display:none}
.flow .flowfig,html:not(.js) .flowfig{display:block;max-width:min(34rem,100%);margin-top:6px}
.flowfig svg{width:100%;height:auto;border-radius:16px;background:rgba(255,250,240,.7);border:1px solid rgba(120,80,40,.15)}

/* ───────── ch5 human fallback + acts ───────── */
.human{position:absolute;right:2vw;top:50%;transform:translateY(-52%);width:min(58vw,calc(76svh * 1.25));opacity:var(--ho,0);visibility:var(--hv,hidden);pointer-events:none}
.human .arm{width:100%;height:auto;display:block;overflow:visible}
.arm .fl{fill:none;stroke:#ffe6c4;stroke-opacity:.5;stroke-width:1.5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:calc(1 - clamp(0, calc(var(--rp,0) * 1.6 - var(--i) * .012), 1))}
.arm__fore{transform:rotate(calc(var(--fr,26) * 1deg))}
.arm__bulge{opacity:calc(.35 + var(--bl,0) * .65)}
.no-gl .human{--ho:1;--hv:visible}
.acts{display:grid;gap:4px}
.acts li{font-size:clamp(34px,6vw,92px);font-weight:700;line-height:1.3;letter-spacing:-.012em;opacity:calc(clamp(0, calc(var(--bp,0) * 3.4 - var(--k) * .95), 1) * .95 + .05);transform:translateY(calc((1 - clamp(0, calc(var(--bp,0) * 3.4 - var(--k) * .95), 1)) * 18px))}
.acts li:nth-child(2){color:rgb(var(--accent-rgb))}
.dark .acts li:nth-child(2){color:#f0c48a}

/* ───────── ch6 formula, CTA, pathway ───────── */
.formula{display:grid;gap:clamp(4px,1.2svh,12px);width:100%}
.formula div{display:flex;align-items:baseline;gap:6px 18px;flex-wrap:wrap;border-top:1px solid rgb(var(--fg-rgb) / .2);padding-top:6px}
.formula dt{font-size:clamp(44px,6.4vw,104px);font-weight:700;line-height:1.12;letter-spacing:-.02em;color:rgb(var(--accent-rgb))}
.formula dd{font-size:clamp(14px,1.3vw,18px);line-height:1.5;color:rgb(var(--fg-rgb) / .84)}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:12px 24px;border-radius:99px;background:rgb(var(--accent-rgb));color:#fff;text-decoration:none;font-weight:700;font-size:16px;border:1.5px solid transparent;transition:transform .2s}
.btn:hover{transform:translateY(-2px)}
.btn--ghost{background:transparent;color:rgb(var(--fg-rgb));border-color:rgb(var(--fg-rgb) / .4)}
.path ol{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:8px}
.path li{display:flex;align-items:baseline;gap:6px;padding:8px 14px;border:1px solid rgb(var(--fg-rgb) / .28);border-radius:99px;font-size:14px;min-height:44px;align-items:center}
.path li>a{display:flex;align-items:baseline;gap:6px;text-decoration:none;min-height:44px;margin:-8px -14px;padding:8px 14px}
.path b{font-size:17px}
.path small{font-size:11.5px;opacity:.75}
.path li[aria-current=step]{background:rgb(var(--accent-rgb));border-color:transparent;color:#fff}
.path li.soon{opacity:.6;border-style:dashed}
.path .fine a{font-weight:600}
.legal{max-width:34em}
.foot{display:flex;gap:22px;justify-content:center;flex-wrap:wrap}
.foot a,.again{font-weight:600;text-decoration:none;border-bottom:1.5px solid currentColor}

/* ───────── drawers ───────── */
.scrim{position:fixed;inset:0;z-index:55;background:rgba(20,10,6,.42)}
.drawer{position:fixed;z-index:60;top:0;right:0;bottom:0;width:min(460px,100vw);background:var(--paper);color:var(--ink);box-shadow:-30px 0 80px -30px rgba(20,10,5,.45);overflow-y:auto;overscroll-behavior:contain;padding:calc(18px + env(safe-area-inset-top)) 22px calc(32px + env(safe-area-inset-bottom));animation:drawer .3s cubic-bezier(.2,.8,.2,1);outline:none}
@keyframes drawer{from{transform:translateX(30px);opacity:0}}
.drawer__head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px}
.drawer h2{font-size:22px}
.drawer h3{font-size:14px;margin:22px 0 6px;letter-spacing:.06em;color:#a5502a}
.drawer p,.drawer li{font-size:14.5px;line-height:1.8}
.drawer ul{list-style:disc;padding-left:20px;display:grid;gap:4px}
.drawer .fine{color:rgba(0,0,0,.66)}
.drawer .chip{color:var(--ink);border-color:rgba(0,0,0,.25);background:transparent;min-height:44px}
.ev{display:grid;gap:14px;list-style:none;padding:0!important}
.ev li{display:grid;gap:2px}
.ev a{font-weight:700}
.ev span{font-size:14px;line-height:1.7;color:rgba(0,0,0,.72)}

/* ───────── modes: flow (reduced motion / read toggle / no-js) ───────── */
html:not(.js) .chapter,.flow .chapter{height:auto;padding:clamp(56px,10vh,110px) 0;margin-top:0!important}
html:not(.js) .pin,.flow .pin{position:relative;height:auto;overflow:visible;display:flex;flex-direction:column;gap:clamp(40px,8vh,90px)}
html:not(.js) .beat,.flow .beat{position:relative;inset:auto;height:auto;opacity:1;transform:none;visibility:visible;pointer-events:auto;padding:0 var(--gut)}
html:not(.js) .beat>*,.flow .beat>*{pointer-events:auto}
html:not(.js) .beat[data-pos=l],.flow .beat[data-pos=l],html:not(.js) .beat[data-pos=r],.flow .beat[data-pos=r]{padding-left:var(--gut);padding-right:max(var(--gut),40vw)}
html:not(.js) .beat[data-pos=c],.flow .beat[data-pos=c]{align-items:flex-start;text-align:left}
html:not(.js) .beat--hero,.flow .beat--hero{padding-bottom:0;padding-top:14vh}
html:not(.js) .ln,.flow .ln{opacity:1;transform:none;filter:none}
html:not(.js) .hint,.flow .hint,html:not(.js) .rail,.flow .rail{display:none}
html:not(.js) #stage,html:not(.js) .veil,html:not(.js) .film,.flow #stage,.flow .film,.flow .veil,.flow .grain{display:none}
html:not(.js) body{background:linear-gradient(#f6efe4,#f7d9c0)}
.flow body,html.flow{background:var(--paper)}
.flow .chapter:nth-child(even){background:rgba(240,223,200,.35)}
.no-gl #stage{display:none}
.no-gl body{background:linear-gradient(180deg,#f6efe4 0%,#f4d4b8 50%,#e8c6a0 100%) fixed}
html:not(.js) .human,.flow .human{position:relative;top:auto;right:auto;transform:none;width:min(100%,640px);opacity:1;visibility:visible;margin:0 auto 20px;--rp:1;--fr:0;--bl:1}
html:not(.js) .arm .fl,.flow .arm .fl{stroke-dashoffset:0}
html:not(.js) .acts li,.flow .acts li{opacity:1;transform:none}
html:not(.js) .foot,.flow .foot{justify-content:flex-start}
html:not(.js) .path ol,.flow .path ol{justify-content:flex-start}
html:not(.js) #evidence[hidden],html:not(.js) #formula[hidden]{display:block!important;position:static;width:auto;height:auto;box-shadow:none;animation:none;border-radius:0;padding:clamp(40px,8vh,90px) var(--gut);background:rgba(240,223,200,.5);z-index:auto}
html:not(.js) [data-open],html:not(.js) [data-close],html:not(.js) #srcOpen,html:not(.js) #readToggle{display:none}
html:not(.js) .bar{position:absolute}

/* ───────── responsive: stacked (phones, portrait) ───────── */
@media (max-aspect-ratio:1/1),(max-width:820px){
  :root{--gut:22px}
  .rail{top:auto;bottom:0;left:0;right:0;transform:none}
  .rail ol{display:none}
  .rail__bar{display:block;height:3px;background:rgb(var(--fg-rgb) / .14)}
  .rail__bar i{display:block;height:100%;width:calc(var(--prog,0) * 100%);background:rgb(var(--accent-rgb))}
  .beat{justify-content:safe flex-end;padding:calc(64px + 3svh) var(--gut) max(44px,calc(env(safe-area-inset-bottom) + 28px))}
  .beat[data-pos=l],.beat[data-pos=r]{padding-left:var(--gut);padding-right:var(--gut)}
  .beat[data-pos=c]{align-items:flex-start;text-align:left}
  .beat--hero{padding-bottom:max(56px,calc(env(safe-area-inset-bottom) + 40px))}
  .beat>*{max-width:100%}
  /* text frame follows the visible viewport; chapter lengths and the GPU surface do not */
  .js:not(.flow) .beat{bottom:auto;height:min(100%,var(--read-h,100svh));gap:clamp(8px,1.5svh,16px)}
  .js:not(.flow) .beat>*{flex-shrink:0}
  .mega{font-size:clamp(30px,min(9.6vw,6svh),56px)}
  .big{font-size:clamp(26px,min(9.2vw,5.6svh),46px)}
  .mid{font-size:clamp(20px,min(5.6vw,3.6svh),28px)}
  .lede{font-size:clamp(15px,min(4.3vw,2.6svh),17px);line-height:1.65}
  .formula dt{font-size:clamp(36px,min(11vw,7svh),60px)}
  .film,.film video{-webkit-mask-image:none}
  .film{-webkit-mask-image:radial-gradient(ellipse 110% 100% at 50% 40%,#000 calc(var(--fo,0) * 80%),transparent calc(var(--fo,0) * 120%));mask-image:radial-gradient(ellipse 110% 100% at 50% 40%,#000 calc(var(--fo,0) * 80%),transparent calc(var(--fo,0) * 120%))}
  .film video,.film__poster{object-position:50% 34%}
  .film::after{background:linear-gradient(0deg,rgba(20,12,10,.94) 0%,rgba(20,12,10,.82) 34%,rgba(20,12,10,.3) 58%,rgba(20,12,10,0) 76%)}
  .human{left:3vw;right:auto;top:11vh;transform:none;width:86vw}
  .acts li{font-size:clamp(30px,min(10vw,6.4svh),56px)}
  .drawer{top:auto;left:0;width:100%;height:82svh;border-radius:22px 22px 0 0;animation-name:sheet}
  @keyframes sheet{from{transform:translateY(30px);opacity:0}}
  .flow .beat[data-pos=l],.flow .beat[data-pos=r],html:not(.js) .beat[data-pos=l],html:not(.js) .beat[data-pos=r]{padding-right:var(--gut)}
  /* ch2: only the active phase caption is shown; ch1: three short columns */
  .js:not(.flow) .ph{grid-template-columns:76px 1fr}
  .js:not(.flow) .ph span{display:none}
  .js:not(.flow) .beat[data-ph="0"] .ph--build span,.js:not(.flow) .beat[data-ph="1"] .ph--break span,.js:not(.flow) .beat[data-ph="2"] .ph--again span{display:block}
  .scale{gap:6px}.scale b{font-size:13px}.scale span{font-size:11.5px}
  .btn{flex:1 1 100%;min-height:48px;font-size:15px}
  .path li{padding:6px 12px}
  /* no blur / grain on phones */
  .grain{display:none}
  .ln{filter:none;transform:translateY(calc((1 - var(--t)) * 26px))}
  .chip,.rail a span{-webkit-backdrop-filter:none;backdrop-filter:none}.chip:not(.chip--solid):not([aria-pressed=true]),.rail a span{background:rgb(var(--bg-rgb) / .88)}
  .bar__tools{gap:6px}
  .chip{padding:6px 11px;font-size:12.5px;white-space:nowrap;min-height:44px}
  .bar__brand b{display:none}
}
@media (max-height:640px) and (max-aspect-ratio:1/1){
  .js:not(.flow) .beat{padding-top:64px;gap:8px}
  .js:not(.flow) .tag,.js:not(.flow) .hint,.js:not(.flow) .concept figcaption{display:none}
  .js:not(.flow) .lede{font-size:14.5px;line-height:1.55}
  .js:not(.flow) .formula div{padding-top:3px}
}
/* compact landscape phones: side layout, tight type */
@media (max-height:520px) and (min-aspect-ratio:1/1){
  .js:not(.flow) .beat{padding-top:54px;padding-bottom:14px;gap:6px}
  .js:not(.flow) .mega,.js:not(.flow) .big{font-size:clamp(24px,7.4svh,38px)}
  .js:not(.flow) .mid{font-size:clamp(18px,5svh,24px)}
  .js:not(.flow) .lede{font-size:14px;line-height:1.5}
  .js:not(.flow) .tag,.js:not(.flow) .hint,.js:not(.flow) .concept figcaption,.js:not(.flow) .kick{display:none}
  .js:not(.flow) .formula dt{font-size:clamp(28px,8svh,40px)}
  .js:not(.flow) .btn{min-height:44px;padding:8px 18px;font-size:14px}
  .js:not(.flow) .acts li{font-size:clamp(24px,7.4svh,38px)}
}
@media (max-width:430px){.chip--quiet{display:none}.bar{padding-left:14px;padding-right:14px}.bar__tools{gap:5px}.chip{padding:6px 10px;font-size:12px}.bar__brand{font-size:13.5px;gap:7px;white-space:nowrap}}
@media (max-width:480px){.bar{padding-left:12px;padding-right:12px;gap:8px}.bar__brand{gap:6px;font-size:12px;white-space:nowrap}.bar__tools{gap:4px}.bar .chip{padding:7px 9px;font-size:11px}.bar__mark{width:24px;height:26px}}
@media (prefers-reduced-motion:reduce){.hint i{animation:none}.drawer{animation:none}.film video{transition:none}}
@media print{#stage,.film,.veil,.grain,.bar,.rail{display:none}.pin{position:relative;height:auto}.beat{position:relative;opacity:1;visibility:visible;display:flex}.js .chapter.is-dormant .pin{display:block}}

/* Film crop follows the hand into the phone frame. */
@media (max-aspect-ratio:1/1),(max-width:820px){#film2 video,#film2 .film__poster{object-position:var(--film-x,50%) 50%}}
.flow .ph,.flow .scale li,html:not(.js) .ph,html:not(.js) .scale li{opacity:1!important}

/* Keep the opening hierarchy inside shorter desktop frames. */
@media (min-width:821px) and (min-aspect-ratio:1/1){.beat--hero .mega{font-size:clamp(44px,min(7.4vw,10svh),110px)}}
@media (max-aspect-ratio:1/1),(max-width:820px){
 .path{width:100%}.path ol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;width:100%}
 .path li{padding:10px 2px;display:flex;flex-direction:column;gap:2px;min-width:0;align-items:center;text-align:center;border-radius:12px}
 .path li a{display:flex;flex-direction:column;gap:2px;align-items:center}
 .path li b{font-size:22px;line-height:1.2}.path li span{font-size:11px}.path li small{font-size:10px}
}

.film::before{content:"";position:absolute;inset:0 0 auto;height:100px;z-index:1;background:linear-gradient(rgba(20,12,10,.55),transparent)}