/* TopoRobotics — site styles */
:root {
  --bg: #0d1012;
  --bg-2: #14171a;
  --bg-3: #1b1f23;
  --line: rgba(255,255,255,0.10);
  --line-2: rgba(255,255,255,0.18);
  --fg: #eef1f2;
  --fg-2: #b6bec3;
  --fg-3: #7d878d;
  --teal: #46d2dc;
  --teal-2: #0e6e73;
  --teal-dim: rgba(70,210,220,0.14);
  --serif: "Newsreader", "Cambria", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;
  --max: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 17px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--teal); }
::selection { background: var(--teal-2); color: #fff; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; margin: 0; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--teal); }
.eyebrow { display: block; margin-bottom: 22px; }
.eyebrow::before { content: ""; display: inline-block; width: 22px; height: 1px; background: var(--teal); vertical-align: middle; margin-right: 12px; }

/* nav */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 20; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  background: linear-gradient(to bottom, rgba(13,16,18,0.85), rgba(13,16,18,0.55)); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--serif); font-size: 22px; letter-spacing: -0.01em; }
.brand svg { width: 26px; height: 26px; }
.nav ul { list-style: none; display: flex; gap: 32px; margin: 0; padding: 0; font-size: 14px; color: var(--fg-2); }
.nav ul a[aria-current="page"] { color: var(--fg); }
.nav ul a { position: relative; padding: 6px 0; }
.nav ul a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 1px; background: var(--teal); transition: right .25s ease; }
.nav ul a:hover::after, .nav ul a[aria-current="page"]::after { right: 0; }
.nav .ext { color: var(--fg-3); }
.nav .ext svg { width: 15px; height: 15px; vertical-align: -2px; margin-left: 4px; }
@media (max-width: 640px) { .nav ul { gap: 20px; } .nav .ext span { display: none; } }

/* hero */
.hero { position: relative; min-height: 100svh; display: flex; align-items: flex-end; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero::after { content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to right, rgba(13,16,18,0.92) 0%, rgba(13,16,18,0.75) 38%, rgba(13,16,18,0.15) 70%, rgba(13,16,18,0.0) 100%),
              linear-gradient(to top, rgba(13,16,18,0.95) 0%, rgba(13,16,18,0.2) 35%, rgba(13,16,18,0.0) 60%); }
.hero .wrap { position: relative; z-index: 2; width: 100%; padding-top: 140px; padding-bottom: 72px; }
.hero h1 { font-size: clamp(44px, 7vw, 96px); line-height: 1.02; max-width: 12ch; letter-spacing: -0.02em; }
.hero h1 em { font-style: italic; color: var(--teal); }
.hero .lede { margin-top: 28px; max-width: 58ch; font-size: clamp(17px, 1.5vw, 20px); color: var(--fg-2); }
.hero .cta { margin-top: 36px; display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 12px 20px; border: 1px solid var(--line-2); border-radius: 999px;
  font-size: 14px; color: var(--fg); transition: border-color .2s, background .2s, color .2s; }
.btn:hover { border-color: var(--teal); color: var(--teal); }
.btn.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn.primary:hover { background: var(--teal); border-color: var(--teal); color: var(--bg); }
.btn svg { width: 14px; height: 14px; }
.hud { position: absolute; right: var(--gutter); bottom: 28px; z-index: 2; display: flex; gap: 28px; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3); }
.hud b { display: block; font-weight: 400; color: var(--teal); font-size: 18px; letter-spacing: 0; margin-top: 2px; font-variant-numeric: tabular-nums; }
@media (max-width: 760px) { .hud { position: static; margin-top: 40px; gap: 20px; } .hero .wrap { padding-bottom: 40px; } }
.scroll-hint { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 2; color: var(--fg-3); font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; }
@media (max-width: 760px) { .scroll-hint { display: none; } }

/* sections */
section { padding: clamp(72px, 10vw, 140px) 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(32px, 6vw, 96px); align-items: start; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }
.grid h2 { font-size: clamp(32px, 4.2vw, 52px); line-height: 1.1; letter-spacing: -0.02em; position: sticky; top: 96px; }
.grid h2 em { font-style: italic; color: var(--teal); }
.prose { font-size: clamp(17px, 1.35vw, 19px); color: var(--fg-2); max-width: 62ch; }
.prose p + p { margin-top: 1.2em; }
.prose strong { color: var(--fg); font-weight: 500; }
.prose a { border-bottom: 1px solid var(--line-2); }
.prose a:hover { border-color: var(--teal); }
.pull { font-family: var(--serif); font-size: clamp(22px, 2.4vw, 30px); line-height: 1.35; color: var(--fg); max-width: 26ch; margin: 0 0 32px; }
.pull em { color: var(--teal); font-style: italic; }

/* numbers */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 48px; }
@media (max-width: 760px) { .stats { grid-template-columns: 1fr; } }
.stat { background: var(--bg); padding: 28px 28px 24px; }
.stat b { display: block; font-family: var(--serif); font-weight: 400; font-size: clamp(40px, 4.5vw, 56px); line-height: 1; letter-spacing: -0.02em; margin-bottom: 14px; }
.stat b small { font-size: 0.5em; color: var(--fg-3); }
.stat.hi b { color: var(--teal); }
.stat span { display: block; font-size: 14px; color: var(--fg-2); line-height: 1.5; }
.stat .mono { display: block; margin-bottom: 18px; color: var(--fg-3); }
.stat.hi .mono { color: var(--teal); }
.note { font-size: 13px; color: var(--fg-3); margin-top: 18px; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--bg); padding: 32px 28px; display: flex; flex-direction: column; gap: 14px; position: relative; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0 auto auto 0; height: 2px; width: 0; background: var(--teal); transition: width .35s ease; }
.card:hover::before { width: 100%; }
.card .mono { color: var(--fg-3); }
.card h3 { font-size: 26px; line-height: 1.15; }
.card p { color: var(--fg-2); font-size: 15px; margin: 0; }
.card .tag { margin-top: auto; padding-top: 10px; font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--teal); }
.card.soon .tag { color: var(--fg-3); }
code.inline { font-family: var(--mono); font-size: 13px; background: var(--bg-3); padding: 3px 8px; border-radius: 4px; color: var(--fg); }
pre.code { font-family: var(--mono); font-size: 13px; line-height: 1.7; background: var(--bg-2); border: 1px solid var(--line); padding: 18px 22px; overflow-x: auto; color: var(--fg-2); margin: 28px 0 0; }
pre.code .k { color: var(--teal); } pre.code .c { color: var(--fg-3); }

/* missions */
.missions { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (max-width: 1000px) { .missions { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .missions { grid-template-columns: 1fr; } }
.mission { background: var(--bg); padding: 28px 22px 26px; }
.mission svg { width: 100%; height: 88px; display: block; margin-bottom: 20px; stroke: var(--fg-3); fill: none; stroke-width: 1; }
.mission svg .t { stroke: var(--teal); }
.mission h3 { font-size: 20px; margin-bottom: 8px; }
.mission p { font-size: 14px; color: var(--fg-2); margin: 0; }

/* roadmap */
.roadmap { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 1px solid var(--line-2); margin-top: 48px; }
@media (max-width: 1000px) { .roadmap { grid-template-columns: 1fr; border-top: 0; border-left: 1px solid var(--line-2); } }
.step { padding: 26px 22px 0 0; position: relative; }
.step::before { content: ""; position: absolute; top: -1px; left: 0; width: 44px; height: 1px; background: var(--teal); }
@media (max-width: 1000px) { .step { padding: 8px 0 32px 24px; } .step::before { top: 16px; left: -1px; width: 1px; height: 44px; } }
.step .mono { color: var(--fg-3); display: block; margin-bottom: 10px; }
.step.now .mono { color: var(--teal); }
.step h3 { font-size: 22px; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--fg-2); margin: 0; }

/* people */
.person { display: grid; grid-template-columns: 1fr; gap: 12px; padding: 28px 0; border-top: 1px solid var(--line); }
.person:last-child { border-bottom: 1px solid var(--line); }
.person h3 { font-size: 24px; }
.person .role { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--teal); }
.person p { color: var(--fg-2); font-size: 15px; margin: 4px 0 0; max-width: 62ch; }
.person .links { display: flex; gap: 18px; font-size: 13px; color: var(--fg-3); margin-top: 6px; }

/* callout / footer */
.callout { background: var(--bg-2); border: 1px solid var(--line); padding: clamp(36px, 5vw, 64px); display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center; }
@media (max-width: 760px) { .callout { grid-template-columns: 1fr; } }
.callout h2 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.12; letter-spacing: -0.02em; max-width: 20ch; }
.callout p { color: var(--fg-2); margin: 12px 0 0; max-width: 52ch; }
footer { padding: 48px 0 40px; border-top: 1px solid var(--line); color: var(--fg-3); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: flex-end; }
footer .cols { display: flex; gap: 48px; flex-wrap: wrap; }
footer .cols div { display: flex; flex-direction: column; gap: 8px; }
footer .cols .mono { color: var(--fg-3); margin-bottom: 4px; }
footer a:hover { color: var(--teal); }
footer .tag { font-family: var(--serif); font-style: italic; color: var(--fg-2); font-size: 16px; }

/* interior pages */
.page { padding-top: 150px; }
.page h1 { font-size: clamp(40px, 6vw, 76px); line-height: 1.04; letter-spacing: -0.02em; max-width: 14ch; }
.page h1 em { font-style: italic; color: var(--teal); }
.page .lede { margin-top: 26px; max-width: 58ch; font-size: clamp(17px, 1.5vw, 20px); color: var(--fg-2); }
.contacts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 56px; }
@media (max-width: 860px) { .contacts { grid-template-columns: 1fr; } }
.contact { background: var(--bg); padding: 32px 28px; display: flex; flex-direction: column; gap: 12px; min-height: 220px; }
.contact .mono { color: var(--fg-3); }
.contact h3 { font-size: 24px; }
.contact p { color: var(--fg-2); font-size: 15px; margin: 0; flex: 1; }
.contact a.mail { font-family: var(--mono); font-size: 14px; color: var(--teal); letter-spacing: 0; border-bottom: 1px solid transparent; width: fit-content; }
.contact a.mail:hover { border-color: var(--teal); }
.list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.list li { padding: 18px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 40px 1fr; gap: 12px; color: var(--fg-2); font-size: 16px; }
.list li .mono { color: var(--fg-3); padding-top: 4px; }
.list li strong { color: var(--fg); font-weight: 500; }

/* reveal on scroll */
.rv { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .rv { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* compact nav on small screens */
@media (max-width: 640px) {
  .nav .wrap { height: 56px; }
  .brand { font-size: 18px; gap: 9px; }
  .brand svg { width: 22px; height: 22px; }
  .nav ul { gap: 16px; font-size: 13px; }
}
@media (max-width: 420px) { .nav ul li:last-child { display: none; } }