/* Vietnam Digital landing. Light, trust-first. Layout: split hero, facts strip, sticky-mark layers,
   3-cell bento, htmx atlas, split process, tinted trust band, FAQ + form. One accent (son red).
   Shape rule: interactive = 10px, surfaces = 16px. */
:root{
  --bg:#f7f8f6;
  --surface:#ffffff;
  --tint:#e8eeea;          /* pale jade tint */
  --ink:#121413;
  --mute:#566059;
  --line:#d8dfda;
  --son:#d2381f;           /* lacquer red, the only accent */
  --son-d:#b92f18;
  --jade:#2e4a40;
  --paper:#ece6d8;         /* giấy dó, from the brandkit */
  --r-ui:6px;
  --r-surf:8px;
  --shadow:0 1px 0 rgba(18,20,19,.04),0 18px 40px -22px rgba(46,74,64,.35);
  --f:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --animate-duration:.7s;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--f);-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
.wrap{width:100%;max-width:1240px;margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
:focus-visible{outline:2px solid var(--son);outline-offset:3px;border-radius:4px}

/* type */
h1{font-weight:600;font-size:clamp(34px,4.8vw,58px);line-height:1.08;letter-spacing:-.035em;max-width:16ch}
h2{font-weight:600;font-size:clamp(26px,3.6vw,42px);line-height:1.15;letter-spacing:-.03em;text-wrap:balance;max-width:22ch}
h3{font-weight:600;font-size:clamp(17px,1.6vw,20px);line-height:1.3;letter-spacing:-.01em}
.lead{font-size:clamp(17px,1.6vw,20px);color:var(--mute);max-width:44ch;font-weight:300}
.sub{color:var(--mute);max-width:58ch;font-weight:300}
section{padding-block:clamp(56px,9vw,112px)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15px/1 var(--f);padding:15px 22px;border-radius:var(--r-ui);border:1px solid transparent;text-decoration:none;cursor:pointer;white-space:nowrap;transition:transform .2s cubic-bezier(.16,1,.3,1),background .2s,border-color .2s}
.btn:active{transform:translateY(1px) scale(.98)}
.btn-primary{background:var(--son);color:#fff}
.btn-primary:hover{background:var(--son-d)}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-quiet{padding:10px 0;color:var(--ink);border-bottom:1px solid var(--ink);border-radius:0}
.btn-quiet:hover{color:var(--son);border-color:var(--son)}
.btn-sm{padding:11px 16px;font-size:14px}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(247,248,246,.97);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{width:30px;height:30px;color:var(--ink)}
.brand-word{font-weight:300;font-size:21px;letter-spacing:-.03em}
.brand-word b{font-weight:800}
.nav-links{display:flex;gap:28px;font-size:14.5px}
.nav-links a{text-decoration:none;color:var(--mute);padding:6px 0}
.nav-links a:hover{color:var(--ink)}
.nav-links a.is-here{color:var(--ink);box-shadow:inset 0 -2px 0 var(--son)}
@media (max-width:760px){
  html{scroll-padding-top:116px}
  .nav-in{height:auto;flex-wrap:wrap;padding-top:10px;row-gap:0}
  .nav-links{order:3;flex:1 1 100%;gap:24px;margin-top:10px;padding-block:9px;border-top:1px solid var(--line);overflow-x:auto}
  .nav-links a{white-space:nowrap;padding-block:4px}
  .nav-links a.is-here{box-shadow:inset 0 -2px 0 var(--son)}
}

/* hero */
.hero{padding-block:clamp(28px,5vw,64px) clamp(40px,6vw,72px)}
.hero-in{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(24px,5vw,72px);align-items:center}
.hero-copy{display:flex;flex-direction:column;gap:24px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.hero-fig{border-radius:var(--r-surf);overflow:hidden;background:var(--tint);box-shadow:var(--shadow);aspect-ratio:4/5;max-height:72dvh;justify-self:end;width:100%}
.hero-fig img{width:100%;height:100%;object-fit:cover}

/* facts */
.facts{padding-block:0 clamp(40px,6vw,72px)}
.facts-in{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid var(--line)}
.fact{padding:28px clamp(16px,2.4vw,32px) 8px 0;display:flex;flex-direction:column;gap:8px}
.fact + .fact{padding-left:clamp(16px,2.4vw,32px);border-left:1px solid var(--line)}
.fact b{font-weight:300;font-size:clamp(30px,3.6vw,46px);letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums;color:var(--ink)}
.fact p{color:var(--mute);font-size:15px;max-width:32ch}
.fact a{font-size:13px;color:var(--son-d)}

/* layers */
.layers{background:var(--surface);border-block:1px solid var(--line)}
.layers-in{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:clamp(24px,6vw,96px);align-items:start}
.layers-mark{position:sticky;top:110px;color:var(--ink);max-width:340px}
.layers-mark svg{width:100%;height:auto;overflow:visible}
.lm{transform-box:fill-box;transform-origin:center}
.js .lm{opacity:0}
.layers-copy{display:flex;flex-direction:column;gap:40px}
.layer-list{display:flex;flex-direction:column}
.layer-list li{display:grid;grid-template-columns:44px minmax(0,1fr);gap:18px;padding:28px 0;border-top:1px solid var(--line)}
.layer-list i{font-size:30px;color:var(--son)}
.layer-list h3{margin-bottom:6px}
.layer-list p{color:var(--mute);max-width:54ch}

/* bento */
.bento-sec .sub{margin-top:14px}
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));grid-template-rows:auto auto;gap:16px;margin-top:40px}
.bt{border-radius:var(--r-surf);overflow:hidden;background:var(--surface);border:1px solid var(--line);display:flex;flex-direction:column}
.bt-img img{width:100%;object-fit:cover}
.bt-body{padding:24px;display:flex;flex-direction:column;gap:8px}
.bt-body p{color:var(--mute);font-size:15px}
.bt-a{grid-column:1 / span 7;grid-row:1 / span 2}
.bt-a img{aspect-ratio:3/2;flex:1;min-height:0}
.bt-b{grid-column:8 / span 5;grid-row:1}
.bt-b img{aspect-ratio:16/9}
.bt-c{grid-column:8 / span 5;grid-row:2}
.bt-list{display:flex;flex-direction:column;gap:6px;margin-top:6px;color:var(--ink);font-size:15px}
.bt-list li{padding-left:16px;position:relative}
.bt-list li::before{content:"";position:absolute;left:0;top:.7em;width:6px;height:2px;background:var(--son)}
.bt-tint{background:var(--tint);border-color:transparent;padding:24px;gap:18px;justify-content:space-between}
.bt-rows{display:flex;flex-direction:column;gap:14px}
.bt-rows li{display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;font-size:14.5px;color:var(--mute)}
.bt-rows i{font-size:24px;color:var(--jade)}
.bt-rows b{display:block;color:var(--ink);font-weight:600}
.bt-c .btn{align-self:flex-start}

/* atlas */
.atlas-sec{background:var(--surface);border-block:1px solid var(--line)}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:28px 0 20px}
.tab{font:500 14px/1 var(--f);padding:12px 18px;border-radius:var(--r-ui);border:1px solid var(--line);background:var(--bg);color:var(--ink);cursor:pointer;display:inline-flex;gap:8px;align-items:center}
.tab span{font:500 12px var(--f-mono);color:var(--mute)}
.tab[aria-selected=true]{background:var(--ink);color:#fff;border-color:var(--ink)}
.tab[aria-selected=true] span{color:#c9d1cc}
.tier-note{color:var(--mute);max-width:64ch;font-size:15px;margin-bottom:20px}
.atlas-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:16px;align-items:start}
.ind-list{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.ind{font:inherit;text-align:left;background:transparent;color:var(--ink);border:0;border-bottom:1px solid var(--line);padding:13px 8px;cursor:pointer;display:flex;justify-content:space-between;gap:12px;transition:background .15s}
.ind:hover{background:var(--bg)}
.ind[aria-pressed=true]{background:var(--tint);box-shadow:inset 3px 0 0 var(--son)}
.ind-n{font:500 11.5px var(--f-mono);color:var(--mute);white-space:nowrap;align-self:center}
.detail{background:var(--bg);border:1px solid var(--line);border-radius:var(--r-surf);padding:clamp(20px,3vw,32px);min-height:380px;display:block}
.detail h3{font-size:clamp(22px,2.6vw,28px);margin-bottom:6px}
.stack{color:var(--mute);font-size:14px;margin-bottom:22px}
.ucs{display:flex;flex-direction:column;margin-bottom:22px;border-top:1px solid var(--line)}
.uc{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 16px;padding:14px 0;border-bottom:1px solid var(--line)}
.uc b{font-weight:600;font-size:15.5px}
.uc p{grid-column:1;color:var(--mute);font-size:14.5px}
.uc-t{grid-column:2;grid-row:1;font:500 12px var(--f-mono);color:var(--son-d);white-space:nowrap}
.note{margin-top:20px;font-size:13px;color:var(--mute);max-width:70ch}
.skel,.skel-block{border-radius:var(--r-surf);background:linear-gradient(90deg,var(--tint),#f2f5f3,var(--tint));background-size:200% 100%;animation:sh 1.4s linear infinite;min-height:120px}
.skel{min-height:300px}
@keyframes sh{to{background-position:-200% 0}}

/* how */
.how-in{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(24px,6vw,88px);align-items:center}
.how-fig{border-radius:var(--r-surf);overflow:hidden;box-shadow:var(--shadow)}
.how-fig img{width:100%;aspect-ratio:4/5;object-fit:cover}
.how-copy{display:flex;flex-direction:column;gap:32px}
.steps{display:flex;flex-direction:column;position:relative}
.steps::before{content:"";position:absolute;left:5px;top:12px;bottom:12px;width:1px;background:var(--line)}
.steps li{position:relative;padding:0 0 26px 32px}
.steps li:last-child{padding-bottom:0}
.steps li::before{content:"";position:absolute;left:0;top:7px;width:11px;height:11px;border-radius:50%;background:var(--bg);border:2px solid var(--son)}
.st-t{font:500 12px var(--f-mono);color:var(--mute);letter-spacing:.04em;text-transform:uppercase}
.steps h3{margin:2px 0 4px}
.steps p{color:var(--mute);max-width:48ch;font-size:15px}

/* trust */
.trust{background:var(--tint);border-block:1px solid #cfd9d3}
.trust-in{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,6fr);gap:clamp(24px,5vw,72px);align-items:start}
.trust-copy{display:flex;flex-direction:column;gap:20px}
.trust-copy h2{max-width:20ch}
.trust-copy p{color:#38443d;max-width:56ch}
.src{font-size:13px}
.src a{color:var(--jade)}
.control{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-surf);padding:clamp(20px,3vw,32px);box-shadow:var(--shadow)}
.control h3{margin-bottom:8px}
.control li{display:grid;grid-template-columns:30px minmax(0,1fr);gap:14px;padding:16px 0;border-top:1px solid var(--line);color:var(--mute);font-size:15px}
.control li:first-of-type{margin-top:10px}
.control i{font-size:26px;color:var(--jade)}
.control b{color:var(--ink);font-weight:600}

/* book */
.terrace{border-radius:var(--r-surf);overflow:hidden;margin-bottom:clamp(36px,6vw,72px)}
.terrace img{width:100%;aspect-ratio:21/9;object-fit:cover}
.book-in{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(24px,5vw,72px);align-items:start}
.faq{display:flex;flex-direction:column;gap:18px}
.faq .sub{margin-bottom:10px}
details{border-top:1px solid var(--line);padding:4px 0}
details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;padding:14px 0;font-weight:600;font-size:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font:400 22px/1 var(--f);color:var(--son);transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--mute);padding:0 0 16px;max-width:60ch;font-size:15.5px}
.form-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-surf);padding:clamp(20px,3vw,32px);box-shadow:var(--shadow);position:sticky;top:96px}
.form-card h3{font-size:22px;margin-bottom:18px}
.form{display:flex;flex-direction:column;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
label{font-weight:500;font-size:14px}
.opt{color:var(--mute);font-weight:400}
input,select,textarea{font:400 16px/1.4 var(--f);color:var(--ink);background:#fff;border:1px solid #9aa59e;border-radius:var(--r-ui);padding:12px 14px;width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid var(--son);outline-offset:1px;border-color:var(--son)}
[aria-invalid=true]{border-color:var(--son-d)}
.help{font-size:13px;color:var(--mute)}
.err{font-size:13.5px;color:var(--son-d);font-weight:500}
.form .btn{width:100%}
.busy{display:none}
.htmx-request .busy{display:inline}
.htmx-request .lbl{display:none}
.htmx-request .btn{opacity:.8;pointer-events:none}
.form-ok{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.form-ok i{font-size:40px;color:var(--jade)}
.form-ok p{color:var(--mute)}

/* footer */
.foot{border-top:1px solid var(--line);padding-block:56px 24px;background:var(--surface)}
.foot-in{display:grid;grid-template-columns:minmax(0,5fr) repeat(3,minmax(0,2fr));gap:32px}
.foot-brand{display:flex;flex-direction:column;gap:12px}
.foot-brand p{color:var(--mute);font-size:15px}
.foot-col{display:flex;flex-direction:column;gap:8px;font-size:15px}
.foot-col h4{font:500 12px var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin-bottom:4px}
.foot-col a{text-decoration:none;color:var(--ink);overflow-wrap:anywhere}
.foot-col a:hover{color:var(--son)}
.foot-end{margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--mute)}

/* reveal: hidden only when JS is on and motion is allowed; failsafe class .in */
.js [data-anim]{opacity:0}
.js [data-anim].in{opacity:1}
[data-delay="1"]{--animate-delay:.12s;animation-delay:.12s}
[data-delay="2"]{animation-delay:.24s}
[data-delay="3"]{animation-delay:.36s}
.hero-fig img{transition:transform 1.2s cubic-bezier(.16,1,.3,1)}
.hero-fig:hover img{transform:scale(1.03)}
.bt-img img{transition:transform .8s cubic-bezier(.16,1,.3,1)}
.bt-img:hover img{transform:scale(1.03)}

@media (max-width:1000px){
  .hero-in,.layers-in,.how-in,.trust-in,.book-in,.atlas-grid{grid-template-columns:1fr}
  .hero-fig{max-height:60dvh;aspect-ratio:4/3;justify-self:stretch;order:-1}
  .layers-mark{position:static;max-width:140px}
  .bento{grid-template-columns:1fr}
  .bt-a,.bt-b,.bt-c{grid-column:auto;grid-row:auto}
  .bt-a img{aspect-ratio:3/2;flex:none}
  .how-fig img{aspect-ratio:3/2}
  .form-card{position:static}
  .foot-in{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
}
@media (max-width:640px){
  .facts-in{grid-template-columns:1fr}
  .fact + .fact{padding-left:0;border-left:0;border-top:1px solid var(--line)}
  .fact{padding-right:0}
  .cta-row .btn{flex:1 1 100%}
  .terrace img{aspect-ratio:16/9}
}
/* motion off = OS setting "reduce motion" or the footer switch (html[data-motion=off], set in <head>) */
html[data-motion="off"]{scroll-behavior:auto}
html[data-motion="off"] .animate__animated{animation:none!important}
html[data-motion="off"] [data-anim]{opacity:1!important;clip-path:none!important}
html[data-motion="off"] .skel,html[data-motion="off"] .skel-block{animation:none}
html[data-motion="off"] *{transition:none!important}

/* ===== Brandkit layer: weight contrast, red full stop, ticks, halftone, construction guides ===== */
h1{font-weight:200;letter-spacing:-.04em}
h1 b{font-weight:800}
h2{font-weight:300}
h2 b{font-weight:700}
.rp{color:var(--son);font-weight:800}
.fact b{font-weight:200}

.ticks{position:relative;overflow:visible}
.ticks img{border-radius:var(--r-surf)}
.ticks:hover img{transform:none}
.ticks::after{content:"";position:absolute;inset:-9px;pointer-events:none;
  background:
    linear-gradient(var(--ink),var(--ink)) top left/16px 1px no-repeat,
    linear-gradient(var(--ink),var(--ink)) top left/1px 16px no-repeat,
    linear-gradient(var(--ink),var(--ink)) bottom right/16px 1px no-repeat,
    linear-gradient(var(--ink),var(--ink)) bottom right/1px 16px no-repeat}
.ht{position:relative}
.ht::before{content:"";position:absolute;inset:0;z-index:1;border-radius:var(--r-surf);pointer-events:none;
  background-image:radial-gradient(rgba(18,20,19,.7) 1px,transparent 1.6px);background-size:6px 6px;
  opacity:.3;-webkit-mask-image:linear-gradient(to top,#000,transparent 40%);mask-image:linear-gradient(to top,#000,transparent 40%)}

.layers-mark svg .guides{color:#a9b4ad}
.guide-note{fill:var(--mute);font-family:var(--f-mono)}
.layers-mark{max-width:380px}

.essence{background:var(--son);color:#fff;padding-block:clamp(48px,8vw,104px);position:relative;overflow:hidden}
.essence::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.16) 1px,transparent 1.5px);background-size:8px 8px;-webkit-mask-image:linear-gradient(110deg,transparent 40%,#000);mask-image:linear-gradient(110deg,transparent 40%,#000);pointer-events:none}
.essence-in{position:relative;display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(24px,5vw,72px);align-items:end}
.essence-line{display:flex;flex-direction:column;font-size:clamp(44px,8vw,104px);line-height:.98;letter-spacing:-.045em}
.essence-line span{font-weight:200}
.essence-line b{font-weight:800}
.essence-line i{font-style:normal}
.essence-side{display:flex;flex-direction:column;gap:20px;align-items:flex-start;max-width:40ch}
.essence-side p{font-size:clamp(16px,1.5vw,19px);font-weight:300;color:#fff}
.btn-onred{background:#fff;color:var(--son-d)}
.btn-onred:hover{background:var(--paper)}

.control{background:var(--paper);position:relative;border-color:#d9d1bd}
.control li{border-top-color:#d4cbb5}
.seal{position:absolute;top:18px;right:18px;width:68px;height:68px;border:2px solid var(--son);border-radius:50%;display:grid;place-items:center;text-align:center;color:var(--son);font:600 9.5px/1.25 var(--f-mono);letter-spacing:.04em;transform:rotate(12deg);box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 4px var(--son)}

.cmd{display:flex;gap:10px;align-items:center;margin-bottom:20px;background:var(--ink);color:var(--paper);border-radius:var(--r-ui);padding:12px 14px;font:500 12.5px/1.4 var(--f-mono);overflow-x:auto;white-space:nowrap}
.cmd .p{color:#8f968f}
.cmd .s{color:#ff8a73}

.foot-big{display:flex;align-items:center;gap:clamp(12px,2vw,28px);padding-top:clamp(40px,6vw,72px);overflow:hidden}
.foot-mark{width:clamp(48px,8vw,112px);height:clamp(48px,8vw,112px);color:var(--ink);flex:none}
.foot-word{font-size:clamp(40px,10vw,140px);font-weight:200;letter-spacing:-.05em;line-height:1;white-space:nowrap}
.foot-word b{font-weight:800}

@media (max-width:1000px){
  .essence-in{grid-template-columns:1fr}
  .layers-mark{max-width:220px}
}


/* ===== three.js hero + d3 flow ===== */
.hero-fig{background:radial-gradient(circle at 50% 40%,#ffffff 0,var(--tint) 72%);box-shadow:none;border:1px solid var(--line);border-radius:var(--r-surf);position:relative}
.hero-fig canvas{position:absolute;inset:0;width:100%;height:100%;border-radius:var(--r-surf);display:block}
.hero-fallback{position:absolute;inset:0;margin:auto;width:56%;height:auto;max-height:70%;color:var(--ink)}
.hero-fig.ready .hero-fallback{display:none}
.flow-fallback{width:180px;height:180px;color:var(--ink)}
.layers-mark{max-width:480px;width:100%}
.layers-mark svg{width:100%;height:auto;display:block;overflow:visible}
.layers-mark .flow-fallback{width:180px}
.fl-line{fill:none;stroke:#b7c1ba;stroke-width:1.2;stroke-dasharray:3 4}
.fl-chip rect{fill:var(--surface);stroke:var(--line);stroke-width:1}
.fl-chip text{font:500 13px var(--f);fill:var(--ink)}
.fl-out rect{fill:var(--tint);stroke:#c4d0c9}
.fl-chev{fill:none;stroke:var(--ink);stroke-width:11;stroke-linejoin:miter}
.fl-chev.red{stroke:var(--son)}
.fl-label{font:500 12.5px var(--f-mono);fill:var(--mute)}
.fl-dot{fill:var(--mute)}
.fl-dot.red{fill:var(--son)}
@media (max-width:1000px){.hero-fig{aspect-ratio:1/1;max-height:56dvh}}

/* terrace: the brand's red sun as a hazy disc, not a pasted circle */
.terrace{position:relative}
.sun{position:absolute;z-index:2;left:65.6%;top:30.2%;width:9%;aspect-ratio:1;transform:translate(-50%,-50%);border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(210,56,31,.82) 0,rgba(210,56,31,.58) 26%,rgba(210,56,31,.2) 50%,rgba(210,56,31,0) 70%);
  opacity:0}
.terrace.in .sun{animation:sunrise 2.6s cubic-bezier(.16,1,.3,1) both .5s}
@keyframes sunrise{from{opacity:0;transform:translate(-50%,-30%)}to{opacity:1;transform:translate(-50%,-50%)}}
html[data-motion="off"] .sun{opacity:1;animation:none!important}
@media (max-width:640px){.sun{width:13%}}


/* ===== Motion layer (each piece has one job) ===== */
/* 1. Headline reads word by word. */
.w{display:inline-block}
/* 2. Photos are revealed with a wipe, then settle. */
.js .bt-img:not(.in) img,.js .how-fig:not(.in) img,.js .terrace:not(.in) img{clip-path:inset(0 0 100% 0)}
.bt-img.in img,.how-fig.in img,.terrace.in img{animation:wipe 1.2s cubic-bezier(.77,0,.18,1) backwards}
html[data-motion="off"] .bt-img img,html[data-motion="off"] .how-fig img,html[data-motion="off"] .terrace img{clip-path:none!important;animation:none!important}
@keyframes wipe{from{clip-path:inset(0 0 100% 0);transform:scale(1.1)}to{clip-path:inset(0 0 0 0);transform:scale(1)}}
/* 3. The list follows the layer the diagram is lighting up. */
.layer-list li{padding-left:16px;transition:background .5s,box-shadow .5s}
.layer-list li i{transition:transform .5s cubic-bezier(.16,1,.3,1)}
.layer-list li.is-active{background:linear-gradient(90deg,var(--tint),rgba(232,238,234,0));box-shadow:inset 3px 0 0 var(--son)}
.layer-list li.is-active i{transform:scale(1.18)}
/* 4. Process photo drifts against the scroll (native scroll-driven animation, progressive). */
@supports (animation-timeline: view()){
  .how-fig{animation:drift linear both;animation-timeline:view();animation-range:cover 0% cover 100%}
  @keyframes drift{from{transform:translateY(34px)}to{transform:translateY(-34px)}}
  html[data-motion="off"] .how-fig{animation:none}
}
/* 5. The red band is alive: dots drift one pattern step, then repeat. */
.essence::before{inset:-8px;animation:dots 5s linear infinite}
@keyframes dots{to{transform:translate3d(-8px,-8px,0)}}
html[data-motion="off"] .essence::before{animation:none}
/* 6. Buttons: arrow nudge + press. */
.btn-quiet i{transition:transform .25s cubic-bezier(.16,1,.3,1)}
.btn-quiet:hover i{transform:translateX(4px)}
.btn-primary,.btn-ghost,.btn-onred{transition:transform .2s cubic-bezier(.16,1,.3,1),background .2s,box-shadow .2s}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 22px -12px rgba(210,56,31,.7)}

/* footer switch */
.foot-end{display:flex;justify-content:space-between;align-items:center;gap:12px 24px;flex-wrap:wrap}
.motion-toggle{font:500 13px var(--f);background:transparent;color:var(--ink);border:1px solid var(--line);border-radius:var(--r-ui);padding:8px 12px;cursor:pointer}
.motion-toggle:hover{border-color:var(--ink)}
.motion-toggle b{font-weight:700;color:var(--son-d)}


/* ===== Intro film ===== */
.film{padding-block:clamp(40px,6vw,88px) clamp(40px,6vw,80px)}
.film h2{margin-bottom:clamp(20px,3vw,36px);max-width:none}
.film-wrap{position:relative}
.film-frame{position:relative;aspect-ratio:16/9;border-radius:var(--r-surf);overflow:hidden;background:var(--ink);border:1px solid var(--line);box-shadow:var(--shadow)}
.film-frame video{display:block;width:100%;height:100%;object-fit:cover}
.film-btn{position:absolute;left:50%;bottom:50%;transform:translate(-50%,50%);display:inline-flex;align-items:center;gap:10px;font:500 16px/1 var(--f);color:#fff;background:rgba(18,20,19,.82);border:1px solid rgba(255,255,255,.28);border-radius:var(--r-ui);padding:16px 22px;cursor:pointer;transition:left .4s cubic-bezier(.16,1,.3,1),bottom .4s cubic-bezier(.16,1,.3,1),transform .4s cubic-bezier(.16,1,.3,1),padding .3s,background .2s}
.film-btn:hover{background:var(--son)}
.film-btn i{font-size:20px}
.film-btn .ph-pause{display:none}
.film-wrap.is-playing .film-btn{left:auto;bottom:auto;right:20px;top:20px;transform:none;padding:10px 14px;font-size:14px;opacity:.0}
.film-wrap.is-playing:hover .film-btn,.film-wrap.is-playing .film-btn:focus-visible{opacity:1}
.film-wrap.is-playing .film-btn .ph-play{display:none}
.film-wrap.is-playing .film-btn .ph-pause{display:inline-block}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
@media (hover:none){.film-wrap.is-playing .film-btn{opacity:1}}
@media (max-width:640px){.film-btn-t{display:none}.film-btn{padding:14px}.film-wrap.is-playing .film-btn{padding:10px}}

/* film: sound switch and chapters */
.film-snd{position:absolute;right:20px;bottom:20px;display:inline-flex;align-items:center;gap:8px;font:500 14px/1 var(--f);color:#fff;background:rgba(18,20,19,.82);border:1px solid rgba(255,255,255,.28);border-radius:var(--r-ui);padding:10px 14px;cursor:pointer;transition:background .2s}
.film-snd:hover{background:var(--son)}
.film-snd i{font-size:18px}
.film-snd .ph-speaker-high{display:none}
.film-snd[aria-pressed="true"] .ph-speaker-high{display:inline-block}
.film-snd[aria-pressed="true"] .ph-speaker-slash{display:none}
.film-chap{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.film-chap button{display:inline-flex;align-items:baseline;gap:10px;font:500 14px/1 var(--f);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-ui);padding:11px 14px;cursor:pointer;transition:border-color .2s,color .2s}
.film-chap button .t{font:500 12px/1 var(--f-mono);color:var(--mute);font-variant-numeric:tabular-nums}
.film-chap button:hover{border-color:var(--ink)}
.film-chap button[aria-current="true"]{border-color:var(--son);color:var(--son-d)}
.film-chap button[aria-current="true"] .t{color:var(--son-d)}
@media (max-width:640px){.film-snd-t{display:none}.film-snd{padding:10px;right:12px;bottom:12px}.film-wrap.is-playing .film-btn{right:12px;top:12px}.film-chap{flex-wrap:nowrap;overflow-x:auto;scroll-snap-type:x proximity;padding-bottom:6px;-webkit-overflow-scrolling:touch}.film-chap li{flex:none;scroll-snap-align:start}.film-chap button{padding:10px 12px;white-space:nowrap}}