/* Neuraline — design tokens
   paper #FBFBFA · ink #0D0D0D · gray #6E6E71 · hairline #E6E6E3
   signal #00E0A4 (reserved: live tracking only) · alert #C4321F
   Display: Inter Tight · Body: Inter · Data: JetBrains Mono
*/

:root {
  --paper: #fbfbfa;
  --paper-2: #f2f2f0;
  --ink: #0d0d0d;
  --gray: #6e6e71;
  --hairline: #e6e6e3;
  --signal: #00e0a4;
  --alert: #c4321f;
  --r: 10px;
  --maxw: 1120px;
  --font-display: "Inter Tight", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0b0b0c;
    --paper-2: #141416;
    --ink: #f5f5f4;
    --gray: #9b9b9f;
    --hairline: #262629;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.nav-in { display: flex; align-items: center; gap: 28px; height: 60px; }
.brand {
  font-family: var(--font-display);
  font-weight: 600; letter-spacing: -.03em; font-size: 18px;
  text-decoration: none; display: flex; align-items: center; gap: 9px;
}
.brand-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--ink) 30%, transparent);
  animation: pulse 3.2s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ink) 26%, transparent); }
  70%, 100% { box-shadow: 0 0 0 10px transparent; }
}
.nav-links { display: flex; gap: 22px; margin-left: 8px; }
.nav-links a { color: var(--gray); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--ink); }
.nav-right { margin-left: auto; display: flex; gap: 10px; align-items: center; }
@media (max-width: 760px) { .nav-links { display: none; } }

/* ---------- buttons ---------- */
.btn {
  font: inherit; font-size: 14px; font-weight: 500;
  padding: 9px 16px; border-radius: 999px;
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  cursor: pointer; text-decoration: none; display: inline-flex;
  align-items: center; gap: 8px; transition: opacity .15s ease, transform .15s ease;
}
.btn:hover { opacity: .82; }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--hairline); }
.btn.ghost:hover { border-color: var(--ink); opacity: 1; }
.btn.wide { width: 100%; justify-content: center; padding: 12px 16px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn.danger { background: transparent; color: var(--alert); border-color: color-mix(in srgb, var(--alert) 40%, transparent); }

:where(a, button, input, [tabindex]):focus-visible {
  outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 4px;
}

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--font-display); letter-spacing: -.035em; line-height: 1.05; margin: 0; font-weight: 600; }
h1 { font-size: clamp(40px, 6.4vw, 76px); }
h2 { font-size: clamp(28px, 3.6vw, 42px); }
h3 { font-size: 19px; letter-spacing: -.02em; }
.lede { font-size: clamp(17px, 1.5vw, 20px); color: var(--gray); max-width: 58ch; margin: 20px 0 0; }
.eyebrow {
  font-family: var(--font-data); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--gray);
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
@media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; gap: 36px; } }
.hero-cta { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 13px; color: var(--gray); font-family: var(--font-data); }

/* ---------- the signature: tracking stage ---------- */
.stage {
  position: relative; aspect-ratio: 4 / 3; width: 100%;
  border: 1px solid var(--hairline); border-radius: var(--r);
  background: var(--paper-2); overflow: hidden;
}
.stage video, .stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.stage video { object-fit: cover; transform: scaleX(-1); opacity: .16; filter: grayscale(1) contrast(1.1); }
.stage canvas { pointer-events: none; }
.stage-empty {
  position: absolute; inset: 0; display: grid; place-items: center;
  text-align: center; padding: 24px; gap: 14px;
}
.stage-hud {
  position: absolute; left: 12px; bottom: 12px; z-index: 3;
  font-family: var(--font-data); font-size: 11px; color: var(--gray);
  display: flex; gap: 14px; letter-spacing: .04em;
}
.stage-hud b { color: var(--ink); font-weight: 500; }

/* the cursor the hand drives */
#pinch-cursor {
  position: fixed; z-index: 900; width: 26px; height: 26px; margin: -13px 0 0 -13px;
  border: 1.5px solid var(--ink); border-radius: 50%; pointer-events: none;
  display: none; transition: width .12s, height .12s, background .12s;
  mix-blend-mode: difference;
}
#pinch-cursor.pinched { width: 14px; height: 14px; margin: -7px 0 0 -7px; background: var(--signal); }
body.hand-target :is(a, button, .card):hover { outline: 1px solid var(--signal); }

/* ---------- sections ---------- */
.section { padding: 88px 0; border-top: 1px solid var(--hairline); }
.section-head { max-width: 62ch; margin-bottom: 44px; }
.section-head .lede { margin-top: 14px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--hairline); border: 1px solid var(--hairline); border-radius: var(--r); overflow: hidden; }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--paper); padding: 26px; display: flex; flex-direction: column; gap: 10px; }
.card p { margin: 0; color: var(--gray); font-size: 14.5px; }
.card .eyebrow { margin-bottom: 4px; }

/* gesture legend — encodes the actual bindings, not decoration */
.legend { border: 1px solid var(--hairline); border-radius: var(--r); overflow: hidden; }
.legend-row { display: grid; grid-template-columns: 150px 1fr 90px; gap: 16px; padding: 14px 18px; border-bottom: 1px solid var(--hairline); align-items: center; font-size: 14px; }
.legend-row:last-child { border-bottom: 0; }
.legend-row .g { font-family: var(--font-data); font-size: 12.5px; }
.legend-row .d { color: var(--gray); }
.legend-row .s { font-family: var(--font-data); font-size: 11px; color: var(--gray); text-align: right; }
.legend-row.live { background: color-mix(in srgb, var(--signal) 10%, transparent); }
.legend-row.live .s { color: var(--ink); }
@media (max-width: 640px) { .legend-row { grid-template-columns: 1fr; gap: 4px; } .legend-row .s { text-align: left; } }

/* ---------- auth ---------- */
.auth { min-height: calc(100vh - 60px); display: grid; place-items: center; padding: 48px 24px; }
.panel {
  width: 100%; max-width: 420px; border: 1px solid var(--hairline);
  border-radius: 14px; padding: 32px; background: var(--paper);
}
.panel h1 { font-size: 28px; }
.field { margin-top: 16px; }
.field label { display: block; font-size: 13px; color: var(--gray); margin-bottom: 6px; }
.field input {
  width: 100%; font: inherit; font-size: 15px; padding: 11px 13px;
  border: 1px solid var(--hairline); border-radius: 8px;
  background: var(--paper); color: var(--ink);
}
.field input:focus { border-color: var(--ink); outline: none; }
.hint { font-size: 12.5px; color: var(--gray); margin-top: 8px; }
.divider { display: flex; align-items: center; gap: 12px; margin: 22px 0; color: var(--gray); font-size: 12px; }
.divider::before, .divider::after { content: ""; height: 1px; background: var(--hairline); flex: 1; }
.tabs { display: flex; gap: 4px; padding: 4px; background: var(--paper-2); border-radius: 999px; margin-bottom: 22px; }
.tabs button { flex: 1; font: inherit; font-size: 13px; padding: 8px; border: 0; border-radius: 999px; background: transparent; color: var(--gray); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--paper); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.08); }

.msg { margin-top: 16px; font-size: 13.5px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--hairline); display: none; }
.msg.show { display: block; }
.msg.err { color: var(--alert); border-color: color-mix(in srgb, var(--alert) 35%, transparent); }

/* ---------- app shell ---------- */
.app { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 60px); }
@media (max-width: 860px) { .app { grid-template-columns: 1fr; } .side { display: none; } }
.side { border-right: 1px solid var(--hairline); padding: 24px 16px; }
.side a { display: block; padding: 8px 10px; border-radius: 7px; text-decoration: none; font-size: 14px; color: var(--gray); }
.side a:hover, .side a.on { background: var(--paper-2); color: var(--ink); }
.main { padding: 36px 32px 96px; max-width: 860px; }
.view { display: none; } .view.on { display: block; }

.list { border: 1px solid var(--hairline); border-radius: var(--r); margin-top: 20px; }
.item { padding: 14px 16px; border-bottom: 1px solid var(--hairline); display: flex; gap: 14px; align-items: baseline; }
.item:last-child { border-bottom: 0; }
.item .k { font-family: var(--font-data); font-size: 11px; color: var(--gray); width: 110px; flex: none; letter-spacing: .06em; text-transform: uppercase; }
.item .v { flex: 1; font-size: 14.5px; }
.item .lock { font-family: var(--font-data); font-size: 11px; color: var(--gray); }
.empty { padding: 40px; text-align: center; color: var(--gray); font-size: 14px; }

.foot { border-top: 1px solid var(--hairline); padding: 40px 0; color: var(--gray); font-size: 13px; }
.foot-in { display: flex; gap: 24px; flex-wrap: wrap; }
.foot a { text-decoration: none; }
.foot a:hover { color: var(--ink); }