/* FRZRBRN — frost + ember */
:root {
  --bg: #070b12;
  --bg-2: #0c1320;
  --panel: rgba(18, 30, 48, 0.55);
  --line: rgba(160, 220, 255, 0.14);
  --frost: #9fe3ff;
  --frost-2: #d9f4ff;
  --ember: #ff5a2a;
  --ember-2: #ffb347;
  --text: #e7eef6;
  --muted: #8a9bb0;
  --radius: 14px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Space Grotesk", system-ui, -apple-system, Segoe UI, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before { /* frost haze */
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(159, 227, 255, 0.13), transparent 60%),
    radial-gradient(700px 500px at -10% 110%, rgba(255, 90, 42, 0.10), transparent 60%);
  pointer-events: none;
  z-index: -1;
}
a { color: var(--frost); text-decoration: none; }
a:hover { color: var(--frost-2); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 18, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-family: var(--mono); font-weight: 700; letter-spacing: 0.22em; color: var(--text); font-size: 15px; }
.logo span { color: var(--ember); }
.nav ul { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav ul a { color: var(--muted); font-size: 14px; letter-spacing: 0.04em; }
.nav ul a:hover, .nav ul a.active { color: var(--text); }
@media (max-width: 680px) { .nav ul { gap: 14px; } .nav ul li.hide-sm { display: none; } }

/* hero */
.hero { padding: 120px 0 90px; position: relative; overflow: hidden; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--frost); }
.hero h1 {
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  margin: 18px 0 26px;
  font-weight: 700;
}
.hero h1 .cold {
  background: linear-gradient(180deg, var(--frost-2), var(--frost) 55%, #5fb8e6);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero h1 .hot {
  background: linear-gradient(90deg, var(--ember), var(--ember-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: clamp(18px, 2.2vw, 22px); color: var(--muted); max-width: 640px; margin: 0 0 36px; }
.cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 22px; border-radius: 999px;
  font-weight: 600; font-size: 15px;
  border: 1px solid var(--line);
  color: var(--text); background: var(--panel);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
  cursor: pointer; font-family: inherit;
}
.btn:hover { transform: translateY(-1px); border-color: rgba(159, 227, 255, 0.4); color: var(--text); }
.btn.primary { background: linear-gradient(90deg, var(--ember), #ff7a3d); border-color: transparent; color: #140700; }
.btn.primary:hover { color: #140700; filter: brightness(1.07); }

/* crystal decoration */
.crystal {
  position: absolute; right: -40px; top: 70px; width: 420px; height: 420px;
  opacity: 0.55; pointer-events: none;
}
@media (max-width: 900px) { .crystal { width: 260px; height: 260px; right: -80px; top: 30px; opacity: 0.3; } }

/* sections */
section { padding: 90px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 44px; flex-wrap: wrap; }
.section-head .num { font-family: var(--mono); color: var(--ember); font-size: 13px; }
.section-head h2 { font-size: clamp(30px, 4vw, 44px); margin: 0; letter-spacing: -0.02em; }
.section-head p { color: var(--muted); margin: 0; flex-basis: 100%; max-width: none; }

.grid { display: grid; gap: 18px; }
.grid.c3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid.c2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  position: relative;
  overflow: hidden;
}
.card::after { /* frost edge */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(217, 244, 255, 0.5), transparent);
}
.card h3 { margin: 10px 0 8px; font-size: 20px; }
.card p { color: var(--muted); margin: 0; font-size: 15.5px; }
.card .ico { font-family: var(--mono); font-size: 12px; color: var(--frost); letter-spacing: 0.2em; }

/* pipeline */
.pipeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.pipeline div { padding: 26px 22px; border-right: 1px solid var(--line); background: var(--panel); }
.pipeline div:last-child { border-right: 0; background: linear-gradient(180deg, rgba(255, 90, 42, 0.14), var(--panel)); }
.pipeline b { display: block; font-family: var(--mono); font-size: 12px; color: var(--ember); letter-spacing: 0.2em; margin-bottom: 8px; }
.pipeline span { color: var(--muted); font-size: 15px; }
@media (max-width: 760px) {
  .pipeline { grid-template-columns: 1fr; }
  .pipeline div { border-right: 0; border-bottom: 1px solid var(--line); }
}

/* about */
.about { display: grid; grid-template-columns: 280px 1fr; gap: 48px; align-items: start; }
.avatar {
  aspect-ratio: 1; border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(159, 227, 255, 0.25), rgba(255, 90, 42, 0.25)),
    var(--bg-2);
  border: 1px solid var(--line);
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 64px; font-weight: 700; color: var(--frost-2);
}
.about h3 { font-size: 28px; margin: 0 0 4px; }
.about .role { color: var(--frost); font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em; margin-bottom: 20px; }
.about p { color: #c3cfdc; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.tag { font-family: var(--mono); font-size: 12px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
@media (max-width: 760px) { .about { grid-template-columns: 1fr; } .avatar { max-width: 180px; } }

/* project library */
.proj { display: flex; flex-direction: column; min-height: 230px; }
.proj .meta { display: flex; justify-content: space-between; align-items: center; }
.status { font-family: var(--mono); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; padding: 4px 10px; border-radius: 999px; }
.status.active { color: var(--ember-2); background: rgba(255, 179, 71, 0.1); }
.status.research { color: var(--frost); background: rgba(159, 227, 255, 0.1); }
.status.concept { color: var(--muted); background: rgba(138, 155, 176, 0.12); }
.proj .foot { margin-top: auto; padding-top: 20px; display: flex; justify-content: space-between; align-items: center; }
.lock { font-family: var(--mono); font-size: 12px; color: var(--muted); display: inline-flex; gap: 8px; align-items: center; }
.proj a.open { font-size: 14px; font-weight: 600; }

/* contact */
.contact-box { text-align: center; padding: 70px 26px; }
.contact-box h2 { font-size: clamp(32px, 5vw, 56px); margin: 0 0 12px; letter-spacing: -0.03em; }
.contact-box p { color: var(--muted); margin: 0 0 30px; }

/* forms */
.gate { min-height: calc(100vh - 64px - 90px); display: grid; place-items: center; padding: 60px 24px; }
.gate .card { width: 100%; max-width: 420px; padding: 36px; }
.gate h1 { margin: 12px 0 6px; font-size: 30px; }
.gate p { margin-bottom: 24px; }
input[type=password] {
  width: 100%; padding: 14px 16px; border-radius: 10px;
  border: 1px solid var(--line); background: rgba(0, 0, 0, 0.35);
  color: var(--text); font-size: 16px; font-family: var(--mono);
  margin-bottom: 14px; outline: none;
}
input[type=password]:focus { border-color: var(--frost); box-shadow: 0 0 0 3px rgba(159, 227, 255, 0.15); }
.err { color: var(--ember); font-size: 14px; min-height: 20px; margin-bottom: 10px; font-family: var(--mono); }
.gate .btn { width: 100%; justify-content: center; }

/* vault / doc pages */
.doc { padding: 70px 0 90px; }
.doc .back { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.doc h1 { font-size: clamp(36px, 5vw, 56px); margin: 16px 0 10px; letter-spacing: -0.03em; }
.doc h2 { margin-top: 44px; font-size: 24px; }
.doc p, .doc li { color: #c3cfdc; }
.doc .summary { font-size: 20px; color: var(--muted); max-width: 720px; }
.kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin: 30px 0; }
.kv div { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: var(--panel); }
.kv b { display: block; font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 4px; }
.vault-bar { display: flex; justify-content: space-between; align-items: center; font-family: var(--mono); font-size: 12px; color: var(--ember-2); padding-top: 10px; padding-bottom: 10px; }

footer { border-top: 1px solid var(--line); padding: 34px 0; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer .mono { font-family: var(--mono); letter-spacing: 0.1em; }

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