/* shared by practice-*.html */
:root{
  --void:#050609;
  --steel:#0d1016;
  --steel-2:#151a23;
  --line:rgba(180,196,220,.14);
  --text:#c8cfd9;
  --text-dim:#6b7583;
  --white:#eef2f7;
  --chrome:linear-gradient(100deg,#464d59 0%,#a9b3c1 16%,#eaeff6 28%,#767f8c 40%,#333944 54%,#c2cad5 70%,#5b6472 86%,#98a2b0 100%);
  --irid:linear-gradient(115deg,#6a5ae0 0%,#24c6c9 52%,#c9a4ff 100%);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--void);color:var(--text);font:400 16px/1.6 "Inter Tight",system-ui,sans-serif;overflow-x:hidden}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:200;background-image:var(--grain);opacity:.045;mix-blend-mode:overlay}
::selection{background:#24c6c9;color:#04050a}
a:focus-visible,button:focus-visible,.veil:focus-visible{outline:2px solid #24c6c9;outline-offset:4px}

.wrap{max-width:1180px;margin:0 auto;padding:0 clamp(20px,5vw,64px)}
.mono{font:400 12px/1.5 "IBM Plex Mono",monospace;letter-spacing:.06em;color:var(--text-dim)}

/* top bar */
.bar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:16px clamp(20px,5vw,64px);
  background:linear-gradient(to bottom,rgba(5,6,9,.9),rgba(5,6,9,0));
  backdrop-filter:blur(6px);
}
.back{
  display:inline-flex;align-items:center;gap:10px;text-decoration:none;
  font:500 11px/1 "IBM Plex Mono",monospace;letter-spacing:.18em;text-transform:uppercase;color:var(--text-dim);
  transition:color .3s;
}
.back:hover{color:var(--white)}
.back .arrow{transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.back:hover .arrow{transform:translateX(-5px)}
.lang{display:flex;border:1px solid var(--line);border-radius:100px;overflow:hidden;background:rgba(8,10,15,.55)}
.lang button{background:none;border:0;cursor:pointer;color:var(--text-dim);font:500 11px/1 "IBM Plex Mono",monospace;letter-spacing:.14em;padding:9px 14px;transition:.3s}
.lang button[aria-pressed="true"]{color:#04050a;background:var(--white)}
.lang button:not([aria-pressed="true"]):hover{color:var(--white)}

/* masthead */
.head{padding:clamp(110px,16vh,180px) 0 clamp(36px,6vh,64px)}
.eyebrow{
  font:500 11px/1 "IBM Plex Mono",monospace;letter-spacing:.24em;text-transform:uppercase;color:#24c6c9;
  margin-bottom:24px;
}
h1{
  font:700 clamp(34px,5.6vw,80px)/1 "Archivo",sans-serif;letter-spacing:-.035em;max-width:16ch;
  background:var(--chrome);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.meta{display:flex;flex-wrap:wrap;gap:8px 28px;border-top:1px solid var(--line);margin-top:clamp(28px,5vh,48px);padding-top:18px}

/* video */
.stage{
  position:relative;aspect-ratio:16/9;background:#000;overflow:hidden;
  border:1px solid var(--line);
}
.stage video{width:100%;height:100%;object-fit:cover;display:block;filter:saturate(.75) contrast(1.05)}
.veil{
  position:absolute;inset:0;z-index:5;display:grid;place-items:center;cursor:pointer;
  background:radial-gradient(80% 60% at 50% 45%,rgba(36,198,201,.10),transparent 70%),linear-gradient(160deg,#0a0d13,#05060a 60%);
  transition:opacity .9s cubic-bezier(.2,.8,.2,1),visibility .9s;
}
.veil::before{content:"";position:absolute;inset:0;opacity:.35;background:repeating-linear-gradient(to bottom,rgba(255,255,255,.04) 0 1px,transparent 1px 3px)}
.veil.gone{opacity:0;visibility:hidden}
.disc{position:relative;width:clamp(84px,10vw,120px);aspect-ratio:1;display:grid;place-items:center}
.disc .ring{
  position:absolute;inset:0;border-radius:50%;padding:1.5px;
  background:conic-gradient(from 210deg,#31363f,#c9d2dd 12%,#5c6472 26%,#f0f4f9 38%,#3a404b 55%,#aab4c2 72%,#2b2f37 88%,#8b95a3);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 1.5px),#000 0);mask:radial-gradient(farthest-side,transparent calc(100% - 1.5px),#000 0);
  animation:spin 22s linear infinite;
}
.disc .core{position:absolute;inset:9%;border-radius:50%;background:radial-gradient(circle at 34% 28%,#1d222c,#080a0e 70%);box-shadow:inset 0 1px 0 rgba(255,255,255,.09),0 24px 60px rgba(0,0,0,.7);transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.disc .tri{position:relative;z-index:2;width:0;height:0;margin-left:5px;border-left:14px solid var(--white);border-top:10px solid transparent;border-bottom:10px solid transparent;transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.disc .pulse{position:absolute;inset:0;border-radius:50%;border:1px solid rgba(36,198,201,.5);animation:pulse 3.2s ease-out infinite}
.veil:hover .core{transform:scale(1.06)}
.veil:hover .tri{transform:scale(1.12)}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes pulse{0%{transform:scale(1);opacity:.55}70%{transform:scale(1.65);opacity:0}100%{opacity:0}}
.veil-label{position:absolute;bottom:clamp(20px,5%,40px);left:0;right:0;text-align:center;font:400 11px/1 "IBM Plex Mono",monospace;letter-spacing:.3em;text-transform:uppercase;color:var(--text-dim)}
.caption{margin-top:14px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* article */
article{padding:clamp(56px,10vh,120px) 0;display:grid;grid-template-columns:220px 1fr;gap:clamp(30px,6vw,90px);align-items:start}
.aside{position:sticky;top:96px;border-top:1px solid var(--line)}
.aside .spec{display:flex;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px}
.aside .spec span:last-child{color:var(--white);text-align:right}
.body{max-width:68ch}
.body h2{font:600 clamp(21px,2.1vw,30px)/1.15 "Archivo",sans-serif;color:var(--white);letter-spacing:-.015em;margin:clamp(36px,6vh,58px) 0 18px}
.body h2:first-child{margin-top:0}
.body p{font-weight:300;font-size:clamp(16px,1.15vw,18px);margin-bottom:20px}
.body p strong{color:var(--white);font-weight:500}
.pull{
  border-left:1px solid transparent;border-image:var(--irid) 1;
  padding:6px 0 6px 26px;margin:clamp(32px,5vh,48px) 0;
  font:300 clamp(19px,1.8vw,26px)/1.35 "Inter Tight",sans-serif;color:var(--white);letter-spacing:-.01em;
}

/* next */
.next{border-top:1px solid var(--line);padding:clamp(40px,7vh,80px) 0 clamp(28px,5vh,56px)}
.next-link{
  display:flex;justify-content:space-between;align-items:baseline;gap:24px;text-decoration:none;
  padding:26px 0;border-bottom:1px solid var(--line);position:relative;transition:padding-left .4s cubic-bezier(.2,.8,.2,1);
}
.next-link::before{content:"";position:absolute;inset:0 auto 0 0;width:0;background:var(--irid);opacity:.09;transition:width .5s cubic-bezier(.2,.8,.2,1)}
.next-link:hover{padding-left:20px}
.next-link:hover::before{width:100%}
.next-link h3{font:600 clamp(20px,2.4vw,34px)/1.1 "Archivo",sans-serif;color:var(--white);letter-spacing:-.02em}
.next-link .arrow{color:var(--text-dim);font-size:20px}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:24px}

@media (max-width:900px){
  article{grid-template-columns:1fr;gap:36px}
  .aside{position:static;order:2}
  .body{order:1}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}