/* Pura Robotics — shared styles */

:root {
  /* Default palette (warm) */
  --bg: oklch(0.97 0.005 70);
  --bg-elev: oklch(0.95 0.006 70);
  --bg-deep: oklch(0.92 0.008 70);
  --ink: oklch(0.18 0.012 60);
  --ink-2: oklch(0.36 0.012 60);
  --ink-3: oklch(0.55 0.01 60);
  --rule: oklch(0.85 0.008 70);
  --rule-strong: oklch(0.75 0.01 60);
  --accent: oklch(0.68 0.18 45);
  --accent-ink: oklch(0.22 0.05 45);
  --accent-soft: oklch(0.93 0.04 55);

  --serif: "Instrument Serif", "Cormorant Garamond", Georgia, serif;
  --sans: "Inter Tight", "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --pad-x: clamp(20px, 5vw, 80px);
  --max: 1440px;
  --section-y: clamp(80px, 10vw, 160px);
  --density: 1;
}

[data-theme="dark"] {
  --bg: oklch(0.16 0.01 60);
  --bg-elev: oklch(0.20 0.012 60);
  --bg-deep: oklch(0.13 0.012 60);
  --ink: oklch(0.96 0.005 70);
  --ink-2: oklch(0.78 0.008 70);
  --ink-3: oklch(0.58 0.01 70);
  --rule: oklch(0.28 0.01 60);
  --rule-strong: oklch(0.40 0.012 60);
  --accent-soft: oklch(0.30 0.06 50);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.5;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img, svg { display: block; max-width: 100%; }

/* ---------- Type system ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.h-display {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.96;
  font-size: clamp(46px, 7.2vw, 116px);
  color: var(--ink);
}
.h-section {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.028em;
  line-height: 1.02;
  font-size: clamp(36px, 4.6vw, 72px);
}
.h-card {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.1;
  font-size: clamp(22px, 2vw, 28px);
}
.lede {
  font-size: clamp(18px, 1.4vw, 22px);
  line-height: 1.45;
  color: var(--ink-2);
  letter-spacing: -0.012em;
  max-width: 60ch;
}
.body-lg { font-size: 18px; line-height: 1.55; color: var(--ink-2); }
.mono { font-family: var(--mono); font-feature-settings: "ss02"; }

/* ---------- Layout ---------- */
.shell {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}
.section { padding-top: var(--section-y); padding-bottom: var(--section-y); }
.rule { height: 1px; background: var(--rule); width: 100%; }
.rule-strong { height: 1px; background: var(--rule-strong); width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  background: transparent;
  border-bottom: 1px solid transparent;
}
.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 17px;
}
.brand-logo {
  width: 26px;
  height: 26px;
  display: block;
  object-fit: contain;
}
.brand-mark {
  width: 22px;
  height: 22px;
  position: relative;
}
.brand-mark::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, oklch(0.85 0.16 60), var(--accent) 60%, oklch(0.42 0.12 35));
  box-shadow: 0 0 16px -2px color-mix(in oklab, var(--accent) 60%, transparent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-size: 14.5px;
  color: var(--ink-2);
  position: relative;
  padding: 4px 0;
  transition: color 160ms ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.is-active { color: var(--ink); }
.nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--accent);
}
@media (max-width: 820px) {
  .nav-links { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  transition: transform 180ms ease, background 200ms ease, color 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: oklch(0.18 0.05 45);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}
.btn-ghost:hover {
  border-color: var(--ink);
  background: var(--bg-elev);
}
.btn-arrow::after {
  content: "→";
  transition: transform 200ms ease;
}
.btn-arrow:hover::after { transform: translateX(3px); }
.btn-lg { padding: 16px 22px; font-size: 15.5px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-elev);
  padding: 80px var(--pad-x) 32px;
}
.site-footer .footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 60px;
}
.site-footer h4 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin: 0 0 16px;
  font-weight: 500;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.site-footer a { color: var(--ink-2); font-size: 14.5px; transition: color 160ms ease; }
.site-footer a:hover { color: var(--ink); }
.site-footer .meta {
  max-width: var(--max);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.footer-tagline {
  font-size: 16px;
  color: var(--ink-2);
  max-width: 32ch;
  line-height: 1.5;
}
@media (max-width: 820px) {
  .site-footer .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- Cards ---------- */
.card {
  border: 1px solid var(--rule);
  background: var(--bg);
  padding: 28px;
  border-radius: 4px;
  transition: border-color 200ms ease, transform 200ms ease;
}
.card:hover { border-color: var(--rule-strong); }

/* ---------- Placeholder render ---------- */
.render-placeholder {
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      color-mix(in oklab, var(--ink) 6%, transparent) 0,
      color-mix(in oklab, var(--ink) 6%, transparent) 1px,
      transparent 1px,
      transparent 12px
    ),
    var(--bg-elev);
  border: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: space-between;
  padding: 18px;
  overflow: hidden;
  border-radius: 4px;
}
.render-placeholder .corner {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
}
.render-placeholder .corner.bottom { align-items: flex-end; }
.render-placeholder .center-mark {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  text-transform: uppercase;
  pointer-events: none;
}
.render-placeholder .crosshair {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.render-placeholder .crosshair::before,
.render-placeholder .crosshair::after {
  content: "";
  position: absolute;
  background: var(--rule-strong);
}
.render-placeholder .crosshair::before {
  left: 50%; top: 25%; bottom: 25%;
  width: 1px; transform: translateX(-50%);
}
.render-placeholder .crosshair::after {
  top: 50%; left: 25%; right: 25%;
  height: 1px; transform: translateY(-50%);
}

/* Subtle ember-glow product mark */
.ember-mark {
  width: 38%;
  aspect-ratio: 1 / 1.3;
  margin: auto;
  position: relative;
  z-index: 1;
}
.ember-mark .body {
  position: absolute;
  left: 12%; right: 12%;
  bottom: 0; top: 22%;
  background: linear-gradient(180deg,
    oklch(0.42 0.012 60) 0%,
    oklch(0.22 0.012 60) 100%);
  border-radius: 14px 14px 8px 8px;
  box-shadow:
    inset 0 1px 0 oklch(0.55 0.012 60),
    0 30px 50px -20px color-mix(in oklab, var(--ink) 40%, transparent);
}
.ember-mark .head {
  position: absolute;
  left: 28%; right: 28%; top: 4%;
  height: 28%;
  background: radial-gradient(ellipse at 30% 30%,
    oklch(0.78 0.16 50),
    var(--accent) 55%,
    oklch(0.4 0.12 35));
  border-radius: 50%;
  box-shadow: 0 0 40px -8px color-mix(in oklab, var(--accent) 80%, transparent);
}
.ember-mark .stripe {
  position: absolute;
  left: 20%; right: 20%;
  top: 56%;
  height: 4px;
  background: var(--accent);
}

/* ---------- Spec table ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13px;
}
.spec-table tr { border-bottom: 1px solid var(--rule); }
.spec-table td {
  padding: 14px 0;
  vertical-align: top;
}
.spec-table td:first-child {
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 11.5px;
  width: 38%;
  padding-right: 16px;
}
.spec-table td:last-child {
  color: var(--ink);
  font-size: 14px;
}

/* ---------- Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms cubic-bezier(.2,.7,.2,1), transform 700ms cubic-bezier(.2,.7,.2,1);
}
.reveal.in { opacity: 1; transform: none; }

@keyframes ticker {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- Utility ---------- */
.cluster { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.stack { display: flex; flex-direction: column; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 980px) { .grid-3 { grid-template-columns: 1fr; } .grid-4 { grid-template-columns: 1fr 1fr; } .grid-2 { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .grid-4 { grid-template-columns: 1fr; } }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
}
.tag .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* number callout */
.numeral {
  font-family: var(--sans);
  font-weight: 400;
  font-size: clamp(56px, 8vw, 132px);
  letter-spacing: -0.04em;
  line-height: 0.9;
  color: var(--ink);
}
.numeral .unit {
  font-size: 0.32em;
  color: var(--ink-3);
  font-family: var(--mono);
  letter-spacing: 0.04em;
  margin-left: 0.2em;
  vertical-align: 0.6em;
}