/* virus.ai.id — shared by / and /id/. Hand-edited, no build step. */
:root {
  --bg: #f4f1e8;
  --surface: #fffdf7;
  --ink: #17150f;
  --muted: #5f5a4d;
  --line: #17150f;
  --accent: #facc15;
  --accent-soft: #fef3c7;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 1rem; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
.wrap { width: min(100% - 2rem, 76rem); margin: 0 auto; }
a { color: inherit; }
.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.5rem;
  z-index: 10;
  padding: 0.55rem 0.8rem;
  background: var(--accent);
  border: 2px solid var(--line);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-150%);
}
.skip:focus { transform: none; outline: 3px solid var(--line); outline-offset: 2px; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible { outline: 3px solid var(--line); outline-offset: 3px; }

/* top bar */
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  padding: 0.7rem 0 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
}
.topbar { padding-top: 0.2rem; }
.topbar nav { display: flex; gap: 0.2rem; }
.topbar a { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 0 0.6rem; text-underline-offset: 4px; }
.topbar > a { justify-content: flex-start; padding-left: 0; }
.topbar [aria-current] { color: var(--accent); text-decoration: none; background: linear-gradient(var(--line), var(--line)) center / 100% 1.9em no-repeat; }

/* hero */
header.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 26rem);
  gap: 1.25rem;
  align-items: center;
  padding: 1.2rem 0 1.5rem;
  border-bottom: 3px solid var(--line);
}
/* graph-paper lab notebook behind the hero */
header.hero::before {
  content: "";
  position: absolute;
  inset: 0 -1rem;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(23, 21, 15, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 21, 15, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent);
  mask-image: linear-gradient(to bottom, #000 55%, transparent);
  pointer-events: none;
}
.hero-copy, .hero-art { position: relative; z-index: 1; }
.hero-copy { min-width: 0; }
.eyebrow {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.25rem 0.5rem;
  background: var(--line);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
h1 {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(2rem, 5.6vw, 3.7rem);
  line-height: 1;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
h1 span:not(.nb) { background: var(--accent); padding: 0 0.12em; box-shadow: 0.08em 0.08em 0 var(--line); }
.lead { max-width: 46rem; margin: 0.9rem 0 0; font-size: clamp(1rem, 1.9vw, 1.12rem); }
.lead strong { background: var(--accent); padding: 0 0.15em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.1rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.55rem 1rem;
  background: var(--surface);
  border: 3px solid var(--line);
  box-shadow: 4px 4px 0 var(--line);
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
.btn-primary { background: var(--accent); }
.btn:hover, .btn:focus-visible { background: var(--accent-soft); transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--line); }
.disclaimer {
  max-width: 46rem;
  margin: 1rem 0 0;
  padding: 0.5rem 0.7rem;
  border-left: 6px solid var(--line);
  background: var(--surface);
  font-size: 0.95rem;
}
.hero-art { width: 100%; max-width: 26rem; height: auto; justify-self: end; pointer-events: none; }
.svg-mono { font-family: var(--mono); }

main { padding: 1.6rem 0 2rem; }
section { margin: 0 0 2rem; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2rem 0.9rem; margin: 0 0 0.8rem; }
.section-head h2 { margin: 0; font-size: 1.3rem; letter-spacing: -0.02em; }
.section-head p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* VIRUS tiles */
.virus { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; padding: 0; list-style: none; }
.virus li {
  flex: 1 1 12.5rem;
  padding: 0.85rem;
  background: var(--surface);
  border: 2px solid var(--line);
  box-shadow: 4px 4px 0 var(--line);
}
.virus .tube { display: block; width: 4.8rem; height: auto; }
.virus h3 { margin: 0.4rem 0 0; font-size: 1.05rem; letter-spacing: -0.02em; }
.virus .gloss { margin: 0; color: var(--muted); font-size: 0.875rem; }
.virus .stat { margin: 0.45rem 0 0; font-family: var(--mono); font-size: 1.15rem; font-weight: 800; }
.virus p.text { margin: 0.35rem 0 0; font-size: 0.95rem; color: var(--muted); }

/* facts */
.facts { position: relative; padding: 1rem; background: var(--surface); border: 3px solid var(--line); box-shadow: 4px 4px 0 var(--line); }
.facts h2 { margin: 0 0 0.7rem; font-size: 1.3rem; letter-spacing: -0.02em; }
.facts dl { display: grid; grid-template-columns: minmax(0, 11rem) minmax(0, 1fr); gap: 0.5rem 1rem; margin: 0; }
.facts dt { font-family: var(--mono); font-size: 0.875rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; padding-top: 0.12rem; }
.facts dd { margin: 0; font-size: 0.95rem; }
.facts .asof { margin: 0.8rem 0 0; color: var(--muted); font-size: 0.9rem; }

/* service cards: flex-wrap so the last row grows instead of leaving holes */
.grid { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.card {
  display: flex;
  flex: 1 1 16rem;
  flex-direction: column;
  min-height: 9.5rem;
  padding: 0.9rem;
  background: var(--surface);
  border: 2px solid var(--line);
  box-shadow: 4px 4px 0 var(--line);
  color: inherit;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
.card-primary { position: relative; flex-basis: 100%; min-height: 12.4rem; background: var(--accent); border-width: 3px; box-shadow: 5px 5px 0 var(--line); }
.card-primary .icon { background: var(--surface); }
.card-primary p { max-width: min(62ch, calc(100% - 14rem)); color: #3d392f; }
.card:hover, .card:focus-visible { background: var(--accent-soft); transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--line); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.55rem; }
.icon { display: grid; flex: 0 0 auto; place-items: center; width: 2rem; height: 2rem; background: var(--accent-soft); border: 2px solid var(--line); }
.icon svg { width: 1.1rem; height: 1.1rem; }
.tag { padding: 0.15rem 0.4rem; border: 2px solid var(--line); font-family: var(--mono); font-size: 0.875rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.card h3 { margin: 0; font-size: 1.1rem; line-height: 1.2; letter-spacing: -0.02em; }
.card .host { margin: 0.1rem 0 0; font-family: var(--mono); font-size: 0.875rem; color: var(--muted); overflow-wrap: anywhere; }
.card p { margin: 0.4rem 0 0; color: var(--muted); font-size: 0.95rem; }
.card .go { margin-top: auto; padding-top: 0.7rem; font-weight: 800; font-size: 0.95rem; }
.card .go::after { content: " →"; }

/* steps + fit */
.steps { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { position: relative; flex: 1 1 12rem; padding: 0.85rem 4.6rem 0.85rem 0.85rem; background: var(--surface); border: 2px solid var(--line); box-shadow: 4px 4px 0 var(--line); counter-increment: step; }
.steps li::before { content: "0" counter(step); display: block; font-family: var(--mono); font-size: 0.875rem; font-weight: 800; background: var(--line); color: var(--accent); width: fit-content; padding: 0 0.4rem; margin-bottom: 0.4rem; }
.steps strong { display: block; font-size: 1.02rem; }
.steps .d { display: block; color: var(--muted); font-size: 0.95rem; }
.steps .cap { display: block; margin-top: 0.55rem; font-family: var(--mono); font-size: 0.875rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.step-icon { position: absolute; right: 0.6rem; top: 0.6rem; display: grid; place-items: center; width: 3.4rem; height: 3.4rem; background: var(--accent-soft); border: 2px solid var(--line); }
.step-icon svg { width: 2.8rem; height: 2.8rem; }
.fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); gap: 0.75rem; margin-top: 0.9rem; }
.fit div { padding: 0.85rem; background: var(--surface); border: 2px solid var(--line); }
.fit h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.fit ul { margin: 0; padding-left: 1.15rem; font-size: 1rem; }
.fit li + li { margin-top: 0.25rem; }

/* PDF card */
.company { position: relative; display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 1rem; align-items: center; padding: 0.9rem; background: var(--surface); border: 3px solid var(--line); box-shadow: 4px 4px 0 var(--line); }
.company-preview { display: block; border: 2px solid var(--line); line-height: 0; }
.company-preview img { display: block; width: 100%; height: auto; }
.company-copy h2 { margin: 0.2rem 0 0.4rem; font-size: clamp(1.25rem, 2.5vw, 1.6rem); line-height: 1.1; letter-spacing: -0.02em; }
.company-copy p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.company-copy p.eyebrow { margin: 0 0 0.5rem; color: var(--accent); font-size: 0.875rem; }
.company-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.8rem; }
.company-actions .btn { min-height: 44px; font-size: 0.9rem; box-shadow: 3px 3px 0 var(--line); }

/* FAQ */
.faq { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.faq article { flex: 1 1 22rem; padding: 0.85rem 0.95rem; background: var(--surface); border: 2px solid var(--line); }
.faq h3 { margin: 0 0 0.3rem; font-size: 1rem; }
.faq p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.faq a { color: var(--ink); text-underline-offset: 3px; }

/* contact */
.contact { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem 1.5rem; align-items: center; padding: 1.1rem 1.4rem 1.1rem 1.1rem; background: var(--accent); border: 3px solid var(--line); box-shadow: 5px 5px 0 var(--line); }
.contact h2 { margin: 0 0 0.4rem; font-size: clamp(1.35rem, 3vw, 1.9rem); letter-spacing: -0.02em; }
.contact p { margin: 0; max-width: 52rem; }
.contact .btn { background: var(--surface); }
.contact .btn-primary { background: var(--line); color: var(--accent); }

footer { padding: 1rem 0 1.8rem; border-top: 3px solid var(--line); color: var(--muted); font-size: 0.95rem; }
footer p { margin: 0 0 0.3rem; max-width: 62rem; }
footer strong, footer a { color: var(--ink); }

/* ---- isometric illustrations: inline SVG, decorative (aria-hidden) ----
   One projection (2:1 dimetric) and three-tone faces for every drawing. Each viewBox is computed with
   the room its animation needs, and overflow is visible as a second safety, so nothing is clipped. */
.hero-art, .tube, .contact-art, .card-art, .stamp, .sticker, .facts-art, .faq-art, .ic,
.group-badge svg, .step-icon svg, .labstrip svg { overflow: visible; }

/* static caution band: a calm separator. The words come from CSS, not the DOM (no repeated keywords) */
.tape {
  margin: 1rem 0 0;
  padding: 0.5rem 1rem;
  background: var(--accent);
  border-block: 3px solid var(--line);
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-align: center;
  text-transform: uppercase;
}
.tape::before { content: attr(data-text); }

/* one still DNA divider, always a whole number of 96px tiles so no voxel is cut at the edge */
.helix { display: block; width: 100%; margin: 0 auto 1.6rem; overflow: hidden; }
@supports (width: round(down, 100%, 96px)) { .helix { width: round(down, 100%, 96px); } }

.group-badge {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 3.6rem;
  height: 3.6rem;
  background: var(--surface);
  border: 3px solid var(--line);
  box-shadow: 3px 3px 0 var(--line);
  align-self: center;
}
.group-badge svg { width: 2.8rem; height: 2.8rem; }
.section-head { align-items: center; gap: 0.3rem 0.9rem; }

.card-art { position: absolute; right: 1.2rem; bottom: 0.8rem; height: 9.4rem; width: auto; max-width: 40%; pointer-events: none; }
.card-primary .go { position: relative; z-index: 1; }
/* text on the yellow card: darker than the muted grey, which was 4.49:1 there (needs 4.5) */
.card-primary p, .card-primary .host { color: #2b271c; }

.facts .stamp { position: absolute; top: 0.8rem; right: 1.1rem; width: 8.4rem; height: auto; pointer-events: none; }
.facts-art { position: absolute; right: 1.1rem; bottom: 1rem; width: 7rem; height: 7rem; pointer-events: none; }
@media (min-width: 1001px) { .facts dl { margin-right: 8.4rem; } }

.fit h3 { display: flex; align-items: center; gap: 0.5rem; }
.ic { width: 1.8rem; height: 1.8rem; flex: 0 0 auto; }

.sticker { position: absolute; left: -0.5rem; top: -1.5rem; z-index: 2; width: 8.4rem; height: auto; pointer-events: none; }

.faq-art { margin-left: auto; width: 4.8rem; height: 4.8rem; }
.contact-copy { min-width: 0; }
.contact-art { width: 11.5rem; height: auto; justify-self: end; pointer-events: none; }

.labstrip { display: flex; justify-content: space-between; align-items: flex-end; gap: 0.5rem; margin: 0 0 0.9rem; padding: 0 0 0.9rem; border-bottom: 2px dashed var(--line); }
.labstrip svg { width: 2.4rem; height: 2.4rem; flex: 0 0 auto; }

/* motion policy (WCAG 2.2.2): nothing loops. The hero plays one short intro (about 3 s) and stops.
   Translate only: rotating or scaling an isometric object would break the projection. */
.intro-hop, .intro-drip { transform-box: fill-box; transform-origin: center; }
.intro-hop { animation: hop 1.1s ease-in-out 0.4s 2; }
.intro-drip { animation: drip 2.2s ease-in 1s 1 forwards; }
@keyframes hop { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes drip { 0% { transform: translateY(0); opacity: 1; } 70% { transform: translateY(22px); opacity: 1; } 100% { transform: translateY(25px); opacity: 0; } }

/* Chinese typography: CJK fonts first, no negative tracking, looser leading, scaled-down max widths */
:lang(zh) body { font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif; line-height: 1.7; }
:lang(zh) h1, :lang(zh) h2, :lang(zh) h3 { letter-spacing: 0; }
:lang(zh) h1 { line-height: 1.2; max-width: 15em; }
:lang(zh) .eyebrow, :lang(zh) .tag, :lang(zh) .cap, :lang(zh) .facts dt, :lang(zh) .tape, :lang(zh) .topbar { letter-spacing: 0.04em; }
:lang(zh) .lead { max-width: 40em; }
.nb { white-space: nowrap; }

@media (max-width: 1000px) {
  .facts .stamp, .facts-art { display: none; }
}
@media (max-width: 900px) {
  header.hero { grid-template-columns: minmax(0, 1fr) minmax(0, 15rem); gap: 0.75rem; }
  .card-art { display: none; }
  .card-primary { min-height: 0; }
  .card-primary p { max-width: 62ch; }
}
@media (max-width: 760px) {
  .company { grid-template-columns: minmax(0, 1fr); }
  .facts dl { grid-template-columns: minmax(0, 1fr); gap: 0.1rem; }
  .facts dd { margin-bottom: 0.5rem; }
  .contact { grid-template-columns: minmax(0, 1fr); }
  .contact-art { display: none; }
  .sticker { left: auto; right: 0.4rem; top: -1.5rem; }
  .labstrip svg:nth-child(n+8) { display: none; }
}
@media (max-width: 620px) {
  header.hero { grid-template-columns: minmax(0, 1fr); }
  .hero-art { justify-self: center; max-width: 22rem; margin-top: 0.4rem; }
  .btn { width: 100%; }
  .steps li { padding-right: 4.2rem; }
  .step-icon { width: 3rem; height: 3rem; }
  .step-icon svg { width: 2.5rem; height: 2.5rem; }
}
@media (max-width: 420px) {
  .labstrip svg:nth-child(n+6) { display: none; }
}
/* very narrow phones: let the scene use the full viewport width so its labels stay readable */
@media (max-width: 380px) {
  .hero-art { max-width: none; width: calc(100% + 2rem); margin-inline: -1rem; justify-self: stretch; }
}
@media (prefers-reduced-motion: reduce) {
  .card, .btn { transition: none; }
  .card:hover, .card:focus-visible, .btn:hover, .btn:focus-visible { transform: none; }
  .intro-hop, .intro-drip { animation: none; }
}