/* NEST — nest-eeg.org
   Design system shared with camellayer.com: Inter, square corners, black/white
   surfaces, one accent, uppercase tracked labels, dot pattern, terminal mock. */

:root {
  --bg: #f9f9f9;
  --surface: #ffffff;
  --surface-low: #f3f3f3;
  --surface-container: #eeeeee;
  --surface-high: #e8e8e8;
  --primary: #000000;
  --on-primary: #ffffff;
  --secondary: #5e5e5e;
  --outline: #777777;
  --outline-variant: #c6c6c6;
  --accent: #4338ca;
  --accent-soft: rgba(67, 56, 202, 0.08);
  --error: #ba1a1a;
  --terminal-bg: #1e1e1e;
  --terminal-bar: #2d2d2d;
  --terminal-border: #3a3a3a;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --max: 1280px;
  --pad: 16px;
  --header-h: 56px;
  color-scheme: light;
}

.dark {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-low: #141414;
  --surface-container: #1a1a1a;
  --surface-high: #222222;
  --primary: #ffffff;
  --on-primary: #000000;
  --secondary: #aaaaaa;
  --outline: #555555;
  --outline-variant: #333333;
  --accent: #a99bf5;
  --accent-soft: rgba(169, 155, 245, 0.1);
  --error: #ff6b6b;
  color-scheme: dark;
}

@media (min-width: 640px) { :root { --pad: 24px; } }
@media (min-width: 1024px) { :root { --pad: 32px; } }

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
*:not(.round):not(.terminal) { border-radius: 0 !important; }
.round { border-radius: 9999px !important; }
.terminal { border-radius: 10px !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--primary);
  line-height: 1.5;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-feature-settings: "cv05" 1;
}
main { flex: 1; }
img, svg, canvas { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
code, pre, kbd { font-family: var(--font-mono); }
ul { list-style: none; }
table { border-collapse: collapse; width: 100%; }
::selection { background: var(--primary); color: var(--on-primary); }

/* ---------- typography ---------- */
h1, h2, h3, h4 { line-height: 1.1; letter-spacing: -0.03em; font-weight: 900; }
h1 { font-size: clamp(2.25rem, 5.2vw, 3.75rem); line-height: 1; }
h1.upper { text-transform: uppercase; letter-spacing: -0.04em; }
h2 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); letter-spacing: -0.03em; }
h3 { font-size: 1.125rem; font-weight: 800; letter-spacing: -0.01em; }
h4 { font-size: 1rem; font-weight: 700; letter-spacing: 0; }
p { color: var(--secondary); }
p.lede { font-size: 1.125rem; line-height: 1.6; max-width: 40rem; }
strong, b { color: var(--primary); font-weight: 700; }
.label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--secondary);
}
.label.accent { color: var(--accent); }
.tabular { font-variant-numeric: tabular-nums; }
.muted { color: var(--secondary); }
.small { font-size: 0.875rem; }
.xs { font-size: 0.75rem; }
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.prose p + p { margin-top: 1rem; }
.prose ul { margin-top: 0.75rem; }
.prose li { position: relative; padding-left: 1.25rem; color: var(--secondary); margin-bottom: 0.5rem; font-size: 0.9375rem; line-height: 1.55; }
.prose li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 0.4em; height: 0.4em; background: var(--primary); }
.prose a, .link { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--outline-variant); }
.prose a:hover, .link:hover { text-decoration-color: var(--primary); }

/* ---------- layout ---------- */
.container { max-width: var(--max); margin: 0 auto; padding-left: var(--pad); padding-right: var(--pad); width: 100%; }
.narrow { max-width: 48rem; }
.section { padding: 5rem 0; }
@media (min-width: 1024px) { .section { padding: 7rem 0; } }
.section.low { background: var(--surface-low); }
.section.bordered { border-top: 1px solid var(--outline-variant); }
.section-head { margin-bottom: 3rem; display: grid; gap: 0.75rem; max-width: 44rem; }
.section-head p { font-size: 1rem; }
.grid { display: grid; gap: 1.5rem; }
.grid.two { grid-template-columns: 1fr; }
.grid.three { grid-template-columns: 1fr; }
.grid.four { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid.two, .grid.three, .grid.four { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid.three { grid-template-columns: repeat(3, 1fr); } .grid.four { grid-template-columns: repeat(4, 1fr); } }
.split { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 1024px) { .split { grid-template-columns: 2fr 3fr; gap: 4rem; } .split.even { grid-template-columns: 1fr 1fr; } }
.stack { display: grid; gap: 1.5rem; }
.row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.between { justify-content: space-between; }
.center { text-align: center; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; } .mt-6 { margin-top: 3rem; }
.mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; }
.hide-sm { display: none; }
@media (min-width: 768px) { .hide-sm { display: initial; } }

/* dot pattern (hero backgrounds) */
.dot-pattern {
  position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(circle, var(--primary) 0.5px, transparent 0.5px);
  background-size: 20px 20px; opacity: 0.035;
}

/* ---------- header ---------- */
.header {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--outline-variant);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 900; letter-spacing: -0.04em; font-size: 1.25rem; user-select: none; }
.brand svg { width: 22px; height: 22px; }
.nav { display: none; align-items: center; gap: 2rem; }
@media (min-width: 900px) { .nav { display: flex; } }
.nav a { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); transition: color 0.15s; }
.nav a:hover, .nav a.active { color: var(--primary); }
.lang { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); padding: 0.4rem 0.5rem; border: 1px solid var(--outline-variant); }
.lang:hover { color: var(--primary); border-color: var(--primary); }
.icon-btn { width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; color: var(--secondary); }
.icon-btn:hover { color: var(--primary); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; } .dark .theme-toggle .sun { display: block; } .dark .theme-toggle .moon { display: none; }
.menu-btn { display: inline-flex; }
@media (min-width: 900px) { .menu-btn { display: none; } }
.mobile-nav { display: none; border-top: 1px solid var(--outline-variant); background: var(--surface); }
.mobile-nav.open { display: block; }
.mobile-nav a { display: block; padding: 0.9rem var(--pad); font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); border-bottom: 1px solid var(--outline-variant); }
.mobile-nav a:last-child { border-bottom: 0; }
.mobile-nav a.active { color: var(--primary); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase;
  padding: 0.75rem 1.5rem; border: 1px solid var(--primary); transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.btn.solid { background: var(--primary); color: var(--on-primary); }
.btn.solid:hover { background: var(--on-primary); color: var(--primary); }
.btn.outline { border-width: 2px; color: var(--primary); }
.btn.outline:hover { background: var(--primary); color: var(--on-primary); }
.btn.sm { padding: 0.5rem 1rem; }
.btn svg { width: 14px; height: 14px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }
@media (max-width: 639px) { .btn-row .btn { width: 100%; } }

/* ---------- cards & panels ---------- */
.card { border: 1px solid var(--outline-variant); background: var(--surface); padding: 1.5rem; height: 100%; display: flex; flex-direction: column; gap: 0.75rem; min-width: 0; }
.card p { font-size: 0.9375rem; line-height: 1.55; }
.card .num { font-size: 0.75rem; font-weight: 800; letter-spacing: 0.15em; color: var(--accent); }
.card.flat { background: transparent; }
.card.accent-top { border-top: 3px solid var(--accent); }
.panel { border: 1px solid var(--outline-variant); background: var(--surface); }
.panel-head { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 1rem; border-bottom: 1px solid var(--outline-variant); }
.panel-body { padding: 1.25rem 1rem; }
.rule { height: 1px; background: var(--outline-variant); }
.rule.thick { height: 2px; background: var(--primary); width: 4rem; }
.bar-left { border-left: 4px solid var(--primary); padding-left: 1.25rem; }
.notice { border: 1px solid var(--outline-variant); border-left: 4px solid var(--accent); background: var(--surface); padding: 1rem 1.25rem; font-size: 0.9375rem; }
.notice p { color: var(--primary); }
.badge { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; border: 1px solid var(--outline-variant); padding: 0.35rem 0.6rem; color: var(--secondary); }
.badge .dot { width: 6px; height: 6px; background: var(--accent); }
.badge.status-pending .dot { background: #d4a017; }
.badge.status-done .dot { background: #1a9c4e; }
.badge.status-todo .dot { background: var(--outline); }

/* ---------- stats ---------- */
.stats { display: grid; gap: 2rem; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat .v { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.stat .v.pending { color: var(--secondary); }
.stat .k { margin-top: 0.6rem; font-size: 0.75rem; color: var(--secondary); line-height: 1.4; max-width: 14rem; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--outline-variant); background: var(--surface); min-width: 0; }
th { text-align: left; font-size: 0.6875rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); font-weight: 700; padding: 0.9rem 1rem; border-bottom: 2px solid var(--primary); white-space: nowrap; }
td { padding: 0.9rem 1rem; border-bottom: 1px solid var(--outline-variant); font-size: 0.9375rem; color: var(--secondary); vertical-align: top; }
td.k, td strong { color: var(--primary); font-weight: 700; }
tr:last-child td { border-bottom: 0; }
tr.hi td { background: var(--accent-soft); }
td.n { font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }

/* ---------- terminal mock ---------- */
.terminal { background: var(--terminal-bg); border: 1px solid var(--terminal-border); overflow: hidden; color: #fff; }
.terminal-bar { display: flex; align-items: center; padding: 0.6rem 1rem; background: var(--terminal-bar); border-bottom: 1px solid var(--terminal-border); position: relative; }
.terminal-bar .dots { display: flex; gap: 6px; }
.terminal-bar .dots span { width: 12px; height: 12px; display: block; }
.terminal-bar .title { position: absolute; left: 50%; transform: translateX(-50%); font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase; color: #999; }
.terminal-body { padding: 1.5rem; font-family: var(--font-mono); font-size: 0.8125rem; display: grid; gap: 1.25rem; }
.terminal .t-label { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: #a99bf5; margin-bottom: 0.5rem; }
.terminal .t-in { color: rgba(255,255,255,0.7); line-height: 1.6; }
.terminal .t-out { color: #fff; line-height: 1.6; min-height: 3.2em; }
.terminal .t-sep { display: flex; align-items: center; gap: 0.5rem; color: rgba(255,255,255,0.4); }
.terminal .t-sep::before, .terminal .t-sep::after { content: ""; flex: 1; height: 1px; background: rgba(255,255,255,0.1); }
.terminal .t-meta { display: flex; flex-wrap: wrap; gap: 1rem; padding-top: 0.75rem; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.75rem; }
.terminal .t-meta b { color: #a99bf5; font-weight: 700; }
.terminal .t-meta span { color: #fff; font-weight: 600; }
.eeg-canvas { width: 100%; height: 150px; display: block; background: #161616; border: 1px solid var(--terminal-border); }
.cursor::after { content: "_"; animation: blink 1s steps(1) infinite; color: #a99bf5; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- code ---------- */
.code { border: 1px solid var(--outline-variant); background: var(--surface); min-width: 0; }
.code-head { display: flex; align-items: center; justify-content: space-between; padding: 0.5rem 1rem; border-bottom: 1px solid var(--outline-variant); font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); }
.code pre { padding: 1rem; overflow-x: auto; font-size: 0.8125rem; line-height: 1.65; color: var(--primary); }
.code .c { color: var(--secondary); }
.code .k { color: var(--accent); }
.copy { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--secondary); }
.copy:hover { color: var(--primary); }
code.inline { background: var(--surface-container); padding: 0.1em 0.4em; font-size: 0.85em; color: var(--primary); overflow-wrap: anywhere; }

/* ---------- pipeline ---------- */
.pipeline { display: grid; gap: 0.75rem; grid-template-columns: 1fr; }
@media (min-width: 768px) { .pipeline { grid-template-columns: repeat(var(--steps, 5), 1fr); } }
.step { border: 1px solid var(--outline-variant); background: var(--surface); padding: 1rem; position: relative; }
.step .num { font-size: 0.6875rem; font-weight: 800; letter-spacing: 0.15em; color: var(--accent); }
.step .t { font-weight: 700; margin-top: 0.4rem; font-size: 0.9375rem; line-height: 1.3; }
.step .d { font-size: 0.8125rem; color: var(--secondary); margin-top: 0.4rem; line-height: 1.45; }
.step .dim { font-family: var(--font-mono); font-size: 0.75rem; color: var(--secondary); margin-top: 0.5rem; }

/* ---------- faq ---------- */
.faq details { border-bottom: 1px solid var(--outline-variant); }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem 0; font-weight: 600; font-size: 0.9375rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-weight: 400; color: var(--secondary); font-size: 1.25rem; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq .a { padding: 0 0 1.25rem; font-size: 0.9375rem; color: var(--secondary); line-height: 1.6; max-width: 46rem; }

/* ---------- docs layout ---------- */
.docs { display: grid; gap: 2rem; }
@media (min-width: 1024px) { .docs { grid-template-columns: 220px 1fr; gap: 3rem; } }
.docs-side { position: sticky; top: calc(var(--header-h) + 1.5rem); align-self: start; display: none; }
@media (min-width: 1024px) { .docs-side { display: block; } }
.docs-side a { display: block; font-size: 0.8125rem; color: var(--secondary); padding: 0.35rem 0 0.35rem 0.75rem; border-left: 2px solid var(--outline-variant); }
.docs-side a.active, .docs-side a:hover { color: var(--primary); border-left-color: var(--primary); }
.docs-content { display: grid; gap: 4rem; min-width: 0; }
.doc-section { display: grid; gap: 1rem; min-width: 0; scroll-margin-top: calc(var(--header-h) + 1rem); }
.doc-section .num { font-size: 0.75rem; font-weight: 800; letter-spacing: 0.15em; color: var(--accent); }
.doc-section h2 { font-size: 1.5rem; }
.doc-section h3 { margin-top: 0.5rem; }
.doc-section p, .doc-section li { font-size: 0.9375rem; line-height: 1.6; }

/* ---------- timeline ---------- */
.timeline { display: grid; gap: 0; }
.tl { display: grid; grid-template-columns: 7rem 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--outline-variant); }
.tl:last-child { border-bottom: 0; }
.tl .when { font-size: 0.75rem; font-weight: 800; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent); padding-top: 0.2rem; }
.tl .what { font-size: 0.9375rem; color: var(--secondary); }
.tl .what b { display: block; margin-bottom: 0.15rem; }

/* ---------- team ---------- */
.person { border: 1px solid var(--outline-variant); background: var(--surface); padding: 1.5rem; }
.person .name { font-weight: 800; letter-spacing: -0.01em; }
.person .role { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent); margin-top: 0.25rem; }
.person p { margin-top: 0.75rem; font-size: 0.9rem; line-height: 1.55; }

/* ---------- footer ---------- */
.footer { background: var(--surface); border-top: 1px solid var(--outline-variant); padding: 3rem 0; }
.footer-inner { display: flex; flex-direction: column; gap: 2rem; }
@media (min-width: 768px) { .footer-inner { flex-direction: row; justify-content: space-between; align-items: flex-start; } }
.footer .brand { font-size: 1.25rem; }
.footer p { font-size: 0.75rem; max-width: 20rem; line-height: 1.6; }
.footer-cols { display: flex; gap: 3rem; flex-wrap: wrap; }
.footer-cols h5 { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--outline); margin-bottom: 1rem; }
.footer-cols li { margin-bottom: 0.6rem; }
.footer-cols a { font-size: 0.875rem; color: var(--secondary); }
.footer-cols a:hover { color: var(--primary); }
.footer .copy-line { font-size: 0.75rem; color: var(--outline); margin-top: 0.5rem; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 4rem 0 5rem; border-bottom: 1px solid var(--outline-variant); }
@media (min-width: 1024px) { .hero { padding: 6.5rem 0 7rem; } }
.hero-copy { display: grid; gap: 1.5rem; }
.hero-copy .lede { font-size: 1.0625rem; }
.hero-note { font-size: 0.75rem; color: var(--secondary); line-height: 1.5; }

/* ---------- page header ---------- */
.page-head { border-bottom: 1px solid var(--outline-variant); background: var(--surface-low); padding: 3rem 0; }
.page-head h1 { text-transform: uppercase; letter-spacing: -0.04em; margin-top: 0.75rem; font-size: clamp(2rem, 4vw, 2.75rem); }
.page-head p { margin-top: 0.75rem; max-width: 40rem; }

/* demo page */
.demo-grid { display: grid; gap: 1.5rem; }
@media (min-width: 1024px) { .demo-grid { grid-template-columns: 1fr 1fr; } }
.chip { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; border: 1px solid var(--outline-variant); padding: 0.5rem 0.75rem; color: var(--secondary); }
.chip.on { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 0.4rem 1.25rem; font-size: 0.8125rem; }
.kv dt { color: var(--secondary); text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.6875rem; font-weight: 700; padding-top: 0.15rem; }
.kv dd { color: var(--primary); font-family: var(--font-mono); }

#__qa { display: none; }