/* KTwo AI Labs — landing. B&W only. Tokens from BRAND.md §2. */
:root {
  --ink: #0a0a0a;
  --paper: #ffffff;
  --smoke: #f4f4f4;
  --line: #e2e2e2;
  --grey-1: #525252;
  --grey-2: #8a8a8a;
  --dark-line: #2a2a2a;
  --sans: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --maxw: 1200px;
  --gutter: 24px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
h1 { font-size: clamp(2.75rem, 6vw, 4.75rem); line-height: 1.02; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.125rem; }
p { margin: 0; }

a { color: var(--ink); }
img { max-width: 100%; height: auto; display: block; }

.mono { font-family: var(--mono); }

.container { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }

/* Focus: 2px solid ink, offset 2px */
a:focus-visible, button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}
.cta-band a:focus-visible, .cta-band button:focus-visible, .cta-band input:focus-visible {
  outline-color: var(--paper);
}

/* Screen-reader only + skip link */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; border-radius: 8px; text-decoration: none; font-weight: 600;
}
.skip-link:focus { top: 12px; }

/* Eyebrow labels: 12px mono uppercase, grey, short black rule */
.eyebrow {
  font-family: var(--mono); font-size: 0.75rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--grey-1); margin: 0 0 16px;
  display: flex; align-items: center; gap: 12px;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--ink); flex: none; }
.hero-inner .eyebrow { justify-content: center; }

/* Buttons */
.btn {
  display: inline-block; text-decoration: none; font-weight: 500;
  font-size: 1rem; padding: 13px 26px; border-radius: 8px;
  border: 1.5px solid var(--ink); cursor: pointer; font-family: var(--sans);
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--dark-line); border-color: var(--dark-line); }
.btn-sm { padding: 9px 18px; font-size: 0.9375rem; }
.btn-invert { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn-invert:hover { background: var(--smoke); border-color: var(--smoke); }

/* ---- 1. NAV ---- */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper); border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; margin-right: auto; }
.brand-logo { height: 30px; width: auto; }
.brand-word { font-weight: 800; letter-spacing: -0.02em; font-size: 1.0625rem; white-space: nowrap; }
.nav-cta { display: flex; align-items: center; gap: 12px; }

/* ---- 2. HERO ---- */
.hero { padding: 96px 0 88px; text-align: center; border-bottom: 1px solid var(--line); }
.hero-inner { max-width: 860px; }
.hero-logo { width: 200px; margin: 8px auto 28px; }
.hero-ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }
.coming-soon {
  margin-top: 26px; font-size: 0.8125rem; letter-spacing: 0.22em; text-transform: uppercase;
  display: flex; align-items: center; justify-content: center; gap: 14px;
}
.coming-soon::before, .coming-soon::after { content: ""; width: 56px; height: 2px; background: var(--ink); }

/* ---- 3. CTA BAND (black) ---- */
.cta-band { background: var(--ink); color: var(--paper); padding: 96px 0; text-align: center; }
.cta-inner { max-width: 640px; }
.cta-sub { margin: 16px 0 32px; color: #b5b5b5; }
.cta-form { display: flex; gap: 12px; justify-content: center; }
.cta-form input {
  flex: 1 1 auto; max-width: 340px; font-family: var(--mono); font-size: 0.9375rem;
  padding: 13px 18px; border-radius: 8px; border: 1.5px solid var(--dark-line);
  background: var(--ink); color: var(--paper);
}
.cta-form input::placeholder { color: var(--grey-2); }
.cta-note { margin-top: 18px; font-size: 0.875rem; min-height: 1.5em; }

/* ---- 4. LEGAL ---- */
.legal { padding: 96px 0; border-top: 1px solid var(--line); }
.legal-head { max-width: 680px; margin-bottom: 40px; }
.legal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.legal-grid article {
  border: 1px solid var(--line); border-radius: 12px; padding: 28px 26px;
  scroll-margin-top: 84px;
}
.legal-grid article:hover { border-color: var(--ink); }
.legal-grid h3 { margin-bottom: 14px; }
.legal-grid p { color: var(--grey-1); font-size: 0.9375rem; }
.legal-grid p + p { margin-top: 10px; }

/* ---- 5. FOOTER ---- */
.site-footer { border-top: 2px solid var(--ink); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(2, 1fr); gap: 32px; }
.footer-logo { height: 50px; width: auto; }
.footer-tag { margin-top: 14px; font-size: 0.75rem; letter-spacing: 0.18em; color: var(--grey-1); }
.footer-col h3 { font-size: 0.75rem; letter-spacing: 0.18em; color: var(--grey-1); margin-bottom: 14px; font-weight: 500; }
.footer-col a { display: block; text-decoration: none; font-size: 0.9375rem; padding: 4px 0; color: var(--ink); }
.footer-col a:hover { text-decoration: underline; }
.footer-base {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line);
  font-size: 0.875rem; color: var(--grey-1);
}
.footer-links a { color: var(--grey-1); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

/* ---- Reveal (subtle; disabled under reduced motion) ---- */
/* Hidden state applies only when JS runs (html.js) — no-JS keeps content visible. */
html.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity 250ms ease, transform 250ms ease; }
html.js .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .hero { padding: 64px 0 56px; }
  .hero-logo { width: 150px; }
  .legal { padding: 64px 0; }
  .legal-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 64px 0; }
  .cta-form { flex-direction: column; }
  .cta-form input { max-width: none; }
  .footer-grid { grid-template-columns: 1fr; }
}