@font-face { font-family: Inter; src: url(Inter-SemiBold.ttf) format("truetype"); font-weight: 400 700; font-display: swap; }
@font-face { font-family: Plex; src: url(IBMPlexMono-Medium.ttf) format("truetype"); font-display: swap; }

:root {
  --bg: #141416; --panel: #1d1e22; --line: #2e3036; --text: #eceef2; --dim: #a4a9b4;
  --orange: #ff9a4d; --pink: #f0468f; --violet: #9a5cf0; --blue: #4aa8f5;
  --grad: linear-gradient(95deg, var(--orange), var(--pink) 45%, var(--violet) 72%, var(--blue));
  --gutter: clamp(16px, 5vw, 64px);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 17px/1.6 Inter, system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3 { font-weight: 600; line-height: 1.1; letter-spacing: -.02em; margin: 0; }
h1 { font-size: clamp(42px, 6.4vw, 78px); }
h2 { font-size: clamp(30px, 3.6vw, 44px); }
h3 { font-size: 22px; letter-spacing: -.01em; }
p { margin: 0; }
section { padding: clamp(64px, 9vw, 120px) var(--gutter); max-width: 1240px; margin: 0 auto; }
.sub { color: var(--dim); max-width: 60ch; margin-top: 14px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--text); color: var(--bg); padding: 8px 12px; z-index: 9; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 12px var(--gutter); background: rgb(20 20 22 / .86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-size: 19px; }
.brand img { border-radius: 8px; }
.top nav { display: flex; gap: 26px; font-size: 15px; }
.top nav a { color: var(--dim); text-decoration: none; }
.top nav a:hover { color: var(--text); }

.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: center; padding-top: clamp(40px, 6vw, 72px); }
.tag { font: 14px Plex, monospace; color: var(--orange); margin-bottom: 18px; }
.lead { font-size: clamp(18px, 1.6vw, 21px); color: var(--dim); margin-top: 22px; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; margin-top: 32px; }
.btn { background: var(--grad); color: #15101a; text-decoration: none; padding: 14px 24px; border-radius: 8px; }
.btn:hover { filter: brightness(1.08); }
.status { display: inline-flex; align-items: center; gap: 9px; color: var(--dim); font-size: 15px; }
.status i { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }

.stage { margin: 0; }
.stage img { width: 100%; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
model-viewer { width: 100%; height: clamp(360px, 46vw, 560px); background: radial-gradient(60% 55% at 50% 48%, #2b2733, var(--panel) 75%); border: 1px solid var(--line); border-radius: 14px; --poster-color: transparent; }
figcaption { color: var(--dim); font-size: 15px; margin-top: 12px; }
figcaption b { color: var(--text); font-weight: 600; }

.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding-top: 0; padding-bottom: 0; }
.facts div { border-left: 1px solid var(--line); padding: 4px 18px; }
.facts b { display: block; font: 28px Plex, monospace; }
.facts span { color: var(--dim); font-size: 15px; }
.facts p { grid-column: 1 / -1; color: var(--dim); font-size: 14px; margin-top: 16px; padding-left: 18px; }

.steps { list-style: none; counter-reset: s; margin: 48px 0 0; padding: 0; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 76px minmax(0, 1fr); column-gap: 12px; padding: 30px 0; border-top: 1px solid var(--line); }
.steps li::before { content: counter(s); grid-row: 1 / span 3; font: 40px/1 Plex, monospace; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.steps p { color: var(--dim); margin-top: 10px; max-width: 62ch; grid-column: 2; }
.steps h3 { grid-column: 2; }
.steps img { grid-column: 2; margin-top: 20px; border-radius: 12px; width: min(100%, 760px); }

.tools dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 40px 0 0; }
.tools dl div { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.tools dt { font-size: 19px; }
.tools dd { margin: 8px 0 0; color: var(--dim); font-size: 16px; }

.files { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 80px); }
.files ul { margin: 24px 0 0; padding: 0; list-style: none; }
.files li { padding: 14px 0; border-top: 1px solid var(--line); color: var(--dim); }
.files li b { color: var(--text); font-weight: 600; }

.faq { max-width: 860px; }
.faq h2 { margin-bottom: 24px; }
details { border-top: 1px solid var(--line); padding: 16px 0; }
summary { cursor: pointer; font-size: 19px; }
details p { color: var(--dim); margin-top: 10px; }

footer { display: flex; align-items: center; gap: 12px; padding: 28px var(--gutter); border-top: 1px solid var(--line); color: var(--dim); font-size: 14px; }
footer img { border-radius: 6px; flex: none; }

@media (max-width: 860px) {
  .top { flex-wrap: wrap; }
  .top nav { gap: 16px; font-size: 14px; flex-wrap: wrap; }
  .hero, .files { grid-template-columns: minmax(0, 1fr); }
  .facts { grid-template-columns: 1fr 1fr; row-gap: 20px; }
  .tools dl { grid-template-columns: minmax(0, 1fr); }
  .steps li { grid-template-columns: 52px minmax(0, 1fr); }
  .steps li::before { font-size: 30px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.doc { max-width: 760px; margin: 0 auto; padding: 56px var(--gutter) 80px; }
.doc h1 { font-size: clamp(36px, 5vw, 52px); }
.doc h2 { font-size: 24px; margin-top: 34px; }
.doc p { color: var(--dim); margin-top: 10px; }
.doc a, footer a, details a { color: var(--text); }
.plain { list-style: none; padding: 0; margin: 24px 0 0; }
.plain li { padding: 12px 0; border-top: 1px solid var(--line); color: var(--dim); }
.plain b { color: var(--text); font-weight: 600; }

.stages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding-top: 0; padding-bottom: 0; }
.stages figure { margin: 0; }
.stages img { width: 100%; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.stages b { display: block; font-size: 19px; }
.results dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 36px 0 0; }
.results dl div { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.results dt { font: 25px Plex, monospace; }
.results dd { margin: 6px 0 0; color: var(--dim); font-size: 15px; }
.note { color: var(--dim); font-size: 15px; margin-top: 18px; max-width: 68ch; }
@media (max-width: 860px) { .stages, .results dl { grid-template-columns: minmax(0, 1fr); } }