/* NVAP — NeuroVascular Analytics Program
   Techy-minimalist site. Near-black canvas; microglia-green and vasculature-red
   are the only accent colors, used sparingly. Zero build step. */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --canvas: #070709;
  --surface: #0d0d10;
  --surface-2: #101015;
  --shell: rgba(255, 255, 255, 0.022);
  --hair: rgba(255, 255, 255, 0.08);
  --hair-soft: rgba(255, 255, 255, 0.05);
  --ink: #ededf1;
  --ink-dim: #9a9aa4;
  --ink-faint: #63636d;

  /* Microglia (green) + vasculature (red): the only two accents. */
  --green: #57d9a3;
  --green-soft: rgba(87, 217, 163, 0.12);
  --red: #f0576b;
  --red-soft: rgba(240, 87, 107, 0.12);

  --sans: 'Space Grotesk', 'Helvetica Neue', sans-serif;
  --serif: 'Instrument Serif', 'Newsreader', serif;
  --mono: 'JetBrains Mono', 'SF Mono', monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.32, 0.72, 0, 1);

  --maxw: 1120px;
  --radius: 18px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Fixed ambient layers: two slow drifting orbs (green + red) + film grain. */
.ambient { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.05; }
.orb.g { width: 44vw; height: 44vw; background: var(--green); top: -12vw; left: -8vw; animation: drift1 26s var(--ease) infinite alternate; }
.orb.r { width: 40vw; height: 40vw; background: var(--red); bottom: -14vw; right: -6vw; animation: drift2 32s var(--ease) infinite alternate; }
@keyframes drift1 { to { transform: translate3d(8vw, 6vw, 0) scale(1.15); } }
@keyframes drift2 { to { transform: translate3d(-6vw, -5vw, 0) scale(1.1); } }
.grain {
  position: fixed; inset: 0; z-index: 50; pointer-events: none; opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

main, header, footer { position: relative; z-index: 1; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3 { font-weight: 600; letter-spacing: -0.025em; line-height: 1.08; }
.display { font-size: clamp(2.8rem, 7vw, 5.4rem); font-weight: 600; letter-spacing: -0.04em; }
.display .serif { font-family: var(--serif); font-weight: 400; font-style: italic; letter-spacing: -0.02em; }
h2.section-title { font-size: clamp(1.9rem, 4vw, 2.9rem); letter-spacing: -0.03em; }
.lead { font-size: clamp(1.05rem, 2vw, 1.28rem); color: var(--ink-dim); line-height: 1.55; }
p { color: var(--ink-dim); }
a { color: inherit; text-decoration: none; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 10.5px; text-transform: uppercase;
  letter-spacing: 0.24em; color: var(--ink-faint);
  border: 1px solid var(--hair); border-radius: 999px; padding: 6px 13px;
}
.eyebrow .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }

.mono { font-family: var(--mono); }
.grad-rule { height: 1px; background: linear-gradient(90deg, transparent, var(--hair), transparent); border: 0; }

/* ── Nav: floating glass island ─────────────────────────────── */
.nav {
  position: fixed; top: 18px; left: 0; right: 0; z-index: 40;
  display: flex; justify-content: center; pointer-events: none;
}
.nav-inner {
  pointer-events: auto;
  display: flex; align-items: center; gap: 28px;
  padding: 9px 10px 9px 20px;
  background: rgba(14, 14, 18, 0.6); backdrop-filter: blur(20px) saturate(1.4);
  border: 1px solid var(--hair); border-radius: 999px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.02em; }
.brand .mark { width: 28px; height: 28px; object-fit: contain; display: block; }
.nav-links { display: flex; gap: 22px; }
.nav-links a { font-size: 13.5px; color: var(--ink-dim); transition: color 0.3s var(--ease); }
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  font-size: 13px; font-weight: 500; color: var(--canvas); background: var(--ink);
  padding: 8px 16px; border-radius: 999px; transition: transform 0.4s var(--ease-spring), background 0.3s;
}
.nav-cta:hover { background: #fff; }
.nav-cta:active { transform: scale(0.96); }
.nav-burger { display: none; }

/* ── Buttons: button-in-button ──────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--sans); font-size: 15px; font-weight: 500;
  padding: 11px 12px 11px 22px; border-radius: 999px; cursor: pointer;
  border: 1px solid transparent; transition: transform 0.4s var(--ease-spring), background 0.3s var(--ease);
}
.btn .ico {
  width: 30px; height: 30px; border-radius: 999px; display: grid; place-items: center;
  transition: transform 0.4s var(--ease-spring), background 0.3s;
}
.btn:active { transform: scale(0.975); }
.btn-primary { background: var(--ink); color: var(--canvas); }
.btn-primary .ico { background: rgba(0, 0, 0, 0.08); }
.btn-primary:hover { background: #fff; }
.btn-primary:hover .ico { transform: translate(2px, -2px) scale(1.05); }
.btn-ghost { background: var(--shell); color: var(--ink); border-color: var(--hair); padding: 11px 22px; }
.btn-ghost:hover { border-color: rgba(255,255,255,0.18); background: rgba(255,255,255,0.04); }

/* ── Sections ───────────────────────────────────────────────── */
section { padding: clamp(80px, 12vw, 150px) 0; }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head .lead { margin-top: 18px; }

/* ── Hero ───────────────────────────────────────────────────── */
.hero { padding-top: 160px; padding-bottom: 90px; text-align: center; }
.hero .eyebrow { margin-bottom: 30px; }
.hero .lead { max-width: 620px; margin: 26px auto 0; }
.hero-cta { display: flex; gap: 14px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 28px; justify-content: center; margin-top: 40px; flex-wrap: wrap; font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-canvas-wrap { position: relative; margin-top: 66px; }
#neuro { width: 100%; height: 340px; display: block; }

/* App mockup: faux-OS window in a double-bezel shell */
.shell { background: var(--shell); border: 1px solid var(--hair-soft); border-radius: 26px; padding: 8px; }
.window { background: var(--surface); border: 1px solid var(--hair); border-radius: 19px; overflow: hidden; box-shadow: inset 0 1px 0 rgba(255,255,255,0.04); }
.titlebar { display: flex; align-items: center; gap: 8px; padding: 13px 16px; border-bottom: 1px solid var(--hair-soft); }
.titlebar .dot { width: 11px; height: 11px; border-radius: 50%; background: rgba(255,255,255,0.14); }
.titlebar .tb-label { margin-left: 10px; font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }

/* ── Bento grid + double-bezel cards ────────────────────────── */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.card {
  background: var(--shell); border: 1px solid var(--hair-soft); border-radius: 22px; padding: 7px;
  transition: transform 0.5s var(--ease), border-color 0.4s;
}
.card:hover { transform: translateY(-3px); border-color: var(--hair); }
.card-core {
  height: 100%; background: var(--surface); border: 1px solid var(--hair-soft); border-radius: 16px;
  padding: 30px; box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.card h3 { font-size: 1.15rem; margin: 18px 0 10px; letter-spacing: -0.02em; }
.card p { font-size: 14.5px; line-height: 1.55; }
.card .ico-badge {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  border: 1px solid var(--hair);
}
.col-3 { grid-column: span 3; } .col-2 { grid-column: span 2; } .col-4 { grid-column: span 4; } .col-6 { grid-column: span 6; }
.accent-g .ico-badge { background: var(--green-soft); color: var(--green); }
.accent-r .ico-badge { background: var(--red-soft); color: var(--red); }

/* Metric stat strip */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { padding: 26px; border: 1px solid var(--hair-soft); border-radius: 16px; background: var(--surface); }
.stat .num { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 600; letter-spacing: -0.03em; }
.stat .num.g { color: var(--green); } .stat .num.r { color: var(--red); }
.stat .lbl { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-faint); margin-top: 8px; }

/* Two-col split (analytics) */
.split { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.metric-list { display: flex; flex-direction: column; }
.metric-row { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--hair-soft); }
.metric-row:last-child { border-bottom: 0; }
.metric-row .name { font-size: 15px; color: var(--ink); }
.metric-row .desc { font-size: 13px; color: var(--ink-faint); font-family: var(--mono); }

/* Channel legend chips */
.chips { display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.08em; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--hair);
  color: var(--ink-dim);
}
.chip .sw { width: 8px; height: 8px; border-radius: 50%; }
.chip .sw.g { background: var(--green); box-shadow: 0 0 8px var(--green); }
.chip .sw.r { background: var(--red); box-shadow: 0 0 8px var(--red); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: s; }
.step { padding: 28px; border: 1px solid var(--hair-soft); border-radius: 16px; background: var(--surface); }
.step .n { font-family: var(--mono); font-size: 12px; color: var(--green); }
.step h4 { font-size: 1rem; margin: 14px 0 8px; font-weight: 600; }
.step p { font-size: 13.5px; }

/* Code blocks + kbd */
pre { background: var(--surface); border: 1px solid var(--hair); border-radius: 12px; padding: 20px 22px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.7; color: var(--ink-dim); }
pre .c { color: var(--ink-faint); } pre .k { color: var(--green); } pre .r { color: var(--red); }
code.inline { font-family: var(--mono); font-size: 0.86em; background: var(--surface-2); border: 1px solid var(--hair-soft); border-radius: 5px; padding: 2px 6px; color: var(--ink); }
kbd { font-family: var(--mono); font-size: 12px; border: 1px solid var(--hair); border-bottom-width: 2px; border-radius: 6px; background: var(--surface-2); padding: 3px 8px; color: var(--ink); }

/* Accordion */
.acc-item { border-bottom: 1px solid var(--hair-soft); }
.acc-q { width: 100%; text-align: left; background: none; border: 0; cursor: pointer; color: var(--ink); font-family: var(--sans); font-size: 1.05rem; font-weight: 500; padding: 24px 0; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.acc-q .sign { color: var(--ink-faint); font-family: var(--mono); font-size: 1.3rem; transition: transform 0.4s var(--ease); }
.acc-a { max-height: 0; overflow: hidden; transition: max-height 0.5s var(--ease); }
.acc-a p { padding-bottom: 24px; max-width: 640px; }
.acc-item.open .sign { transform: rotate(45deg); }

/* CTA band */
.cta-band { text-align: center; }
.cta-band .shell { max-width: 900px; margin: 0 auto; }
.cta-band .card-core { padding: clamp(48px, 8vw, 90px) 30px; }

/* Footer */
footer { border-top: 1px solid var(--hair-soft); padding: 60px 0 50px; }
.foot { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; flex-wrap: wrap; }
.foot .col h5 { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-faint); margin-bottom: 16px; }
.foot .col a { display: block; font-size: 14px; color: var(--ink-dim); padding: 5px 0; transition: color 0.3s; }
.foot .col a:hover { color: var(--ink); }
.foot-legal { margin-top: 50px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

/* Docs specific */
.doc-shell { display: grid; grid-template-columns: 220px 1fr; gap: 56px; align-items: start; padding-top: 150px; }
.toc { position: sticky; top: 120px; font-size: 13.5px; display: flex; flex-direction: column; gap: 2px; }
.toc a { color: var(--ink-faint); padding: 6px 12px; border-left: 1px solid var(--hair-soft); transition: color 0.3s, border-color 0.3s; }
.toc a:hover, .toc a.active { color: var(--ink); border-color: var(--green); }
.doc-body h2 { font-size: 1.7rem; margin: 64px 0 18px; letter-spacing: -0.03em; scroll-margin-top: 120px; }
.doc-body h2:first-child { margin-top: 0; }
.doc-body h3 { font-size: 1.12rem; margin: 34px 0 12px; }
.doc-body p, .doc-body li { color: var(--ink-dim); font-size: 15px; line-height: 1.7; }
.doc-body ul { padding-left: 20px; margin: 12px 0; } .doc-body li { margin: 6px 0; }
.doc-body pre { margin: 16px 0; }
.doc-body strong { color: var(--ink); font-weight: 600; }

/* Data table */
.tbl { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.tbl th, .tbl td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--hair-soft); }
.tbl th { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); font-weight: 400; }
.tbl td { color: var(--ink-dim); } .tbl td:first-child { color: var(--ink); font-family: var(--mono); font-size: 13px; }

/* ── Scroll reveal ──────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(16px); filter: blur(6px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease), filter 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: none; filter: none; }
.reveal[data-d="1"] { transition-delay: 0.08s; } .reveal[data-d="2"] { transition-delay: 0.16s; } .reveal[data-d="3"] { transition-delay: 0.24s; } .reveal[data-d="4"] { transition-delay: 0.32s; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 40px; }
  .doc-shell { grid-template-columns: 1fr; gap: 32px; }
  .toc { position: static; flex-direction: row; flex-wrap: wrap; }
  .toc a { border-left: 0; border-bottom: 1px solid var(--hair-soft); }
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .bento, .stats, .steps { grid-template-columns: 1fr; }
  .col-3, .col-2, .col-4, .col-6 { grid-column: span 1; }
  section { padding: 72px 0; }
  .hero { padding-top: 130px; }
  #neuro { height: 240px; }
  .foot { gap: 30px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; filter: none; }
}