/* ============================================================
   KogniGen — corporate site design system
   Calm, credible, research-forward. Shared motion language with
   the Bubbles brand (reveal / tilt / counters), quieter palette.
   ============================================================ */

:root {
  /* neutrals + one accent (indigo) */
  --ink: #14142B;
  --ink-soft: #4a4a63;
  --ink-faint: #6b6b82;
  --bg: #FBFBFD;
  --surface: #F2F3F8;
  --line: #E6E7EF;
  --accent: #4f46e5;
  --accent-deep: #3f37c9;
  --accent-soft: #EEF0FB;
  --teal: #12b5b0; /* rare secondary, for small marks */

  --font-display: 'Space Grotesk', 'Avenir Next', sans-serif;
  --font-body: 'Manrope', 'Avenir Next', system-ui, sans-serif;

  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.4rem + 1vw, 2.25rem);
  --step-3: clamp(2rem, 1.6rem + 2vw, 3.25rem);
  --step-4: clamp(2.6rem, 1.9rem + 3.4vw, 4.75rem);

  --pad-x: clamp(22px, 5vw, 72px);
  --section-y: clamp(64px, 10vw, 150px);
  --maxw: 1160px;

  --radius-card: 18px;
  --radius-panel: 24px;
  --radius-pill: 999px;

  --shadow-soft: 0 8px 24px -12px rgba(20, 20, 43, .18);
  --shadow-pop: 0 30px 60px -30px rgba(20, 20, 43, .35);

  --ease-out: cubic-bezier(.2, .7, .2, 1);
  --dur-fast: 140ms;
  --dur: 260ms;
  --dur-slow: 520ms;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.08; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; display: block; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad-x); }
.eyebrow { font-family: var(--font-display); font-size: var(--step--1); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); font-weight: 600; }
.lede { font-size: var(--step-1); color: var(--ink-soft); max-width: 62ch; }
.section { padding-block: var(--section-y); }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--font-display); font-weight: 600; font-size: var(--step-0);
  padding: .78em 1.35em; border-radius: var(--radius-pill); border: 1.5px solid transparent;
  cursor: pointer; transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast);
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-deep); box-shadow: var(--shadow-pop); transform: translateY(-2px); }
.btn--ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn--ghost:hover { border-color: var(--ink); }
.btn--light { background: #fff; color: var(--ink); }
.btn--light:hover { transform: translateY(-2px); box-shadow: var(--shadow-pop); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: inline-flex; align-items: center; gap: .55em; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.logo__mark { width: 30px; height: 30px; }
.nav__links { display: flex; align-items: center; gap: 8px; }
.nav__link { padding: 8px 14px; border-radius: 10px; color: var(--ink-soft); font-weight: 500; font-size: var(--step--1); transition: background var(--dur-fast), color var(--dur-fast); }
.nav__link:hover { background: var(--surface); color: var(--ink); }
.nav__toggle { display: none; }

/* ---------- hero ---------- */
.hero { padding-block: clamp(48px, 8vw, 110px) var(--section-y); position: relative; overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.hero h1 { font-size: var(--step-4); margin-block: .28em .4em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero__note { margin-top: 22px; color: var(--ink-faint); font-size: var(--step--1); }

/* orbit visual */
.orbit { position: relative; aspect-ratio: 1; max-width: 440px; margin-inline: auto; width: 100%; }
.orbit__ring { position: absolute; inset: 0; border: 1.5px solid var(--line); border-radius: 50%; }
.orbit__ring--2 { inset: 15%; }
.orbit__ring--3 { inset: 30%; }
/* the real KogniGen robot, centered in the orbit */
.robot { position: absolute; inset: 0; display: grid; place-items: center; }
.robot::before {
  content: ""; grid-area: 1 / 1; width: 58%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(50% 50% at 50% 45%, rgba(94,197,214,.42), rgba(79,70,229,.16) 55%, transparent 72%);
  filter: blur(16px); animation: robo-glow 8s ease-in-out infinite;
}
.robot__svg { grid-area: 1 / 1; width: 52%; filter: drop-shadow(0 18px 30px rgba(20,20,43,.16)); animation: robo-float 5s var(--ease-out) infinite; transform-origin: center; }
.robo-eyes { transform-box: fill-box; transform-origin: center; animation: robo-blink 4.6s infinite; }
.robo-antenna { transform-box: fill-box; transform-origin: center; animation: robo-antenna 2.2s ease-in-out infinite; }
@keyframes robo-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes robo-blink { 0%, 90%, 100% { transform: scaleY(1); } 93% { transform: scaleY(.12); } 96% { transform: scaleY(1); } }
@keyframes robo-antenna { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.28); opacity: .72; } }
@keyframes robo-glow { 0%, 100% { transform: scale(1); opacity: .85; } 50% { transform: scale(1.08); opacity: 1; } }
.orbit__dot { position: absolute; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); top: -8px; left: calc(50% - 8px); box-shadow: 0 0 0 6px var(--accent-soft); }
.orbit__dot--b { background: var(--teal); }
.spin { animation: spin 24s linear infinite; }
.spin--rev { animation: spin 30s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- trust strip ---------- */
.trust { border-block: 1px solid var(--line); background: var(--surface); }
.trust__row { display: flex; flex-wrap: wrap; gap: clamp(16px, 4vw, 48px); align-items: center; justify-content: center; padding-block: 22px; color: var(--ink-faint); font-family: var(--font-display); font-size: var(--step--1); letter-spacing: .04em; }
.trust__row b { color: var(--ink); font-weight: 600; }

/* ---------- section heads ---------- */
.head { max-width: 60ch; margin-bottom: clamp(32px, 5vw, 56px); }
.head h2 { font-size: var(--step-3); margin-block: .3em .35em; }

/* ---------- pillars ---------- */
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.pillar { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-card); padding: 28px; transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out); }
.pillar:hover { transform: translateY(-4px); box-shadow: var(--shadow-pop); }
.pillar__icon { width: 42px; height: 42px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; margin-bottom: 16px; }
.pillar h3 { font-size: var(--step-1); margin-bottom: 8px; }
.pillar p { color: var(--ink-soft); font-size: var(--step-0); }

/* ---------- bubbles panel ---------- */
.bubbles { background: var(--ink); color: #fff; border-radius: var(--radius-panel); padding: clamp(32px, 5vw, 64px); display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(28px, 5vw, 56px); align-items: center; overflow: hidden; }
.bubbles .eyebrow { color: #a5a1ff; }
.bubbles h2 { font-size: var(--step-3); margin-block: .3em .4em; }
.bubbles p { color: #c9c9de; max-width: 46ch; }
.bubbles__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.bubbles__art { position: relative; aspect-ratio: 1; }
.blob { position: absolute; border-radius: 46% 54% 55% 45% / 52% 46% 54% 48%; box-shadow: var(--shadow-pop); }
.blob--1 { inset: 8% 22% 30% 6%; background: linear-gradient(140deg, #5EC5D6, #8577E6); animation: float 7s ease-in-out infinite; }
.blob--2 { inset: 34% 6% 8% 40%; background: linear-gradient(140deg, #FF8A6B, #FFD36B); animation: float 8s ease-in-out infinite .6s; }
.blob__eyes { position: absolute; inset: 0; display: flex; gap: 12%; align-items: center; justify-content: center; }
.blob__eyes span { width: 13%; aspect-ratio: 1; background: #14142B; border-radius: 50%; }
@keyframes float { 50% { transform: translateY(-10px); } }

/* ---------- stats ---------- */
/* honest early-stage status band (no vanity metrics while in MVP) */
.status { display: flex; align-items: center; justify-content: space-between; gap: clamp(20px, 4vw, 44px); flex-wrap: wrap; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-panel); padding: clamp(28px, 4vw, 48px); }
.status > div { max-width: 60ch; }
.status h2 { font-size: var(--step-2); margin: .3em 0 .45em; }

/* ---------- principles ---------- */
.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-card); overflow: hidden; }
.principle { background: #fff; padding: 30px; }
.principle span { font-family: var(--font-display); color: var(--accent); font-weight: 700; }
.principle h3 { font-size: var(--step-1); margin-block: 10px 8px; }
.principle p { color: var(--ink-soft); }

/* ---------- cta ---------- */
.cta { text-align: center; }
.cta__panel { background: linear-gradient(160deg, var(--accent), var(--accent-deep)); color: #fff; border-radius: var(--radius-panel); padding: clamp(40px, 6vw, 84px); }
.cta__panel h2 { font-size: var(--step-3); margin-bottom: .4em; }
.cta__panel p { color: #dcdafd; max-width: 48ch; margin-inline: auto; margin-bottom: 28px; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 48px; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.footer__brand p { color: var(--ink-faint); font-size: var(--step--1); max-width: 34ch; margin-top: 12px; }
.footer__col h4 { font-family: var(--font-display); font-size: var(--step--1); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px; }
.footer__col a { display: block; color: var(--ink-soft); padding: 5px 0; font-size: var(--step-0); }
.footer__col a:hover { color: var(--accent); }
.footer__legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--ink-faint); font-size: var(--step--1); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__stage { order: -1; }
  .bubbles { grid-template-columns: 1fr; }
  .bubbles__art { max-width: 320px; margin-inline: auto; width: 100%; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .nav__links { position: fixed; inset: 66px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); border-bottom: 1px solid var(--line); padding: 10px var(--pad-x) 18px; transform: translateY(-120%); transition: transform var(--dur) var(--ease-out); }
  .nav__links.open { transform: none; }
  .nav__links .btn { margin-top: 8px; justify-content: center; }
  .nav__link { padding: 12px 8px; }
  .nav__toggle { display: inline-grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
}
@media (max-width: 520px) { .footer__grid { grid-template-columns: 1fr; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}