/* ============================================================
   Kybercel — design system
   Dark, precise, infrastructure-grade.
   ============================================================ */

:root {
  /* surfaces — cold blue-black shadows (sodium-vapor night) */
  --bg:        oklch(0.142 0.014 262);
  --bg-1:      oklch(0.178 0.016 262);   /* raised panel */
  --bg-2:      oklch(0.212 0.018 263);   /* raised panel hover / nested */
  --line:      oklch(0.30 0.018 263);    /* hairline border */
  --line-soft: oklch(0.245 0.016 263);

  /* ink */
  --ink:       oklch(0.975 0.005 250);   /* high-contrast text */
  --ink-mid:   oklch(0.735 0.012 256);   /* body */
  --ink-low:   oklch(0.565 0.014 258);   /* muted / captions */
  --ink-faint: oklch(0.435 0.014 260);   /* faintest / disabled */

  /* accent — sodium amber (the one warm light) */
  --acc:       oklch(0.795 0.142 67);
  --acc-dim:   oklch(0.795 0.142 67 / 0.15);
  --acc-line:  oklch(0.795 0.142 67 / 0.36);
  --acc-ink:   oklch(0.20 0.05 60);      /* text on accent fill */
  --acc-hi:    oklch(0.86 0.145 72);     /* hover / brightest */

  /* violation — restrained cold-shifted red, enforcement viz only */
  --warn:      oklch(0.66 0.205 26);
  --warn-dim:  oklch(0.66 0.205 26 / 0.14);

  /* atmosphere intensity multiplier (overridden by body class) */
  --atmos-mul: 1;

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Hanken Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --maxw: 1200px;
  --pad: clamp(20px, 5vw, 64px);
  --r: 6px;
  --r-lg: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--ink-mid);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--acc); color: var(--acc-ink); }

/* ============================================================
   ATMOSPHERE — Blade Runner as lighting, not theme.
   Cold blue-black shadows, pools of warm sodium light bleeding
   through haze, fine grain + faint scanlines, edge vignette.
   ============================================================ */

/* warm/cold light pools + haze — behind all content */
.atmos {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: var(--atmos-mul);
  background:
    /* faint scanlines — on the background only, behind all content */
    repeating-linear-gradient(0deg, oklch(0 0 0 / 0.16) 0 1px, transparent 1px 3px),
    /* warm sodium pool, upper-right (behind hero codex) */
    radial-gradient(60% 55% at 82% 8%, color-mix(in oklch, var(--acc) 26%, transparent) 0%, transparent 60%),
    /* secondary warm bleed, mid-left */
    radial-gradient(48% 40% at 6% 46%, color-mix(in oklch, var(--acc) 12%, transparent) 0%, transparent 65%),
    /* cold blue depth, lower field */
    radial-gradient(70% 60% at 50% 116%, oklch(0.5 0.11 256 / 0.22) 0%, transparent 60%),
    /* cold haze wash at very top */
    linear-gradient(180deg, oklch(0.3 0.04 258 / 0.18) 0%, transparent 22%);
  background-attachment: fixed;
}

/* vignette only — thin film above content (no stripes over text) */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 70; pointer-events: none;
  opacity: var(--atmos-mul);
  background: radial-gradient(120% 120% at 50% 42%, transparent 52%, oklch(0.04 0.02 262 / 0.55) 100%);
  mix-blend-mode: multiply;
}

/* frosted-glass refraction — coarse noise, two layers drifting in
   opposite directions, behind all content. Reads as light seen through
   textured glass that slowly breathes. Freezes when motion is off. */
.glass {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
  opacity: var(--atmos-mul);
}
.glass::before, .glass::after {
  content: ""; position: absolute; inset: -35%;
  will-change: transform;
  filter: blur(46px);
  mix-blend-mode: screen;
}
.glass::before {
  background:
    radial-gradient(42% 36% at 30% 26%, oklch(0.95 0.02 235 / 0.06), transparent 72%),
    radial-gradient(38% 32% at 72% 64%, oklch(0.9 0.05 70 / 0.05), transparent 74%);
  animation: glassDriftA 64s ease-in-out infinite alternate;
}
.glass::after {
  background:
    radial-gradient(48% 40% at 62% 32%, oklch(0.92 0.015 250 / 0.05), transparent 76%),
    radial-gradient(40% 34% at 26% 74%, oklch(0.9 0.04 60 / 0.035), transparent 76%);
  animation: glassDriftB 88s ease-in-out infinite alternate;
}
@keyframes glassDriftA {
  from { transform: translate3d(-3%, -2%, 0) scale(1.12) rotate(-5deg); }
  to   { transform: translate3d(3%, 3%, 0) scale(1.26) rotate(5deg); }
}
@keyframes glassDriftB {
  from { transform: translate3d(3%, 2%, 0) scale(1.2) rotate(4deg); }
  to   { transform: translate3d(-3%, -3%, 0) scale(1.1) rotate(-4deg); }
}

/* film grain — finest layer on top */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 71; pointer-events: none;
  opacity: calc(0.28 * var(--atmos-mul));
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: soft-light;
}

/* atmosphere intensity (driven by Tweaks) */
body.atmos-subtle { --atmos-mul: 0.5; }
body.atmos-off    { --atmos-mul: 0; }

/* backlit edge — key surfaces feel lit from within */
.glow-edge {
  box-shadow:
    0 0 0 1px color-mix(in oklch, var(--acc) 22%, transparent),
    0 1px 0 0 color-mix(in oklch, var(--acc) 30%, transparent) inset,
    0 30px 90px -40px color-mix(in oklch, var(--acc) 40%, transparent),
    0 50px 100px -60px oklch(0 0 0 / 0.7);
}

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  text-wrap: balance;
}

p { text-wrap: pretty; }

/* ---------- layout ---------- */

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

.section { padding-block: clamp(72px, 10vw, 140px); position: relative; }

/* faint structural guide lines — data/structure as design */
.guides { position: fixed; inset: 0; z-index: 0; pointer-events: none;
  max-width: var(--maxw); margin: 0 auto;
}
.guides::before, .guides::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 1px;
  background: var(--line-soft); opacity: 0.4;
}
.guides::before { left: var(--pad); }
.guides::after  { right: var(--pad); }

main { position: relative; z-index: 1; }

/* ---------- shared bits ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-low);
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow .idx { color: var(--acc); }
.eyebrow::before {
  content: ""; width: 18px; height: 1px; background: var(--acc-line);
  display: inline-block;
}

.section-head { max-width: 760px; margin-bottom: clamp(40px, 6vw, 72px); }
.section-head h2 {
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  margin-top: 22px;
}
.section-head .lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--ink-mid);
  margin-top: 22px;
  max-width: 60ch;
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 14px 22px;
  border-radius: var(--r);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--acc); color: var(--acc-ink); position: relative; overflow: hidden; }
.btn-primary::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, oklch(0 0 0 / 0.18) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
}
.btn-primary > * { position: relative; z-index: 1; }
.btn-primary:hover { background: var(--_hov, var(--acc-hi)); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-low); background: var(--bg-1); }
.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(3px); }
.btn-lg { padding: 18px 30px; font-size: 1.05rem; }

/* mono tag chips */
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-low);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 5px 9px;
  background: var(--bg-1);
  white-space: nowrap;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--line-soft);
  background: oklch(0.142 0.014 262 / 0.72);
  backdrop-filter: blur(14px) saturate(1.1);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 var(--pad);
  height: 66px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand .mark {
  width: 22px; height: 22px; flex: none;
  color: var(--acc); display: block;
}
.brand .name {
  font-family: var(--font-display); font-weight: 600; color: var(--ink);
  font-size: 1.12rem; letter-spacing: -0.01em;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a.txt {
  font-size: 0.92rem; color: var(--ink-mid);
  transition: color 0.15s ease;
}
.nav-links a.txt:hover { color: var(--ink); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
/* compact nav-sized button */
.nav .btn { padding: 9px 15px; font-size: 0.9rem; }

@media (max-width: 720px) {
  .nav-links .txt { display: none; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--line-soft);
  padding-block: 56px;
  color: var(--ink-low);
  font-size: 0.9rem;
}
.footer-grid { display: flex; flex-wrap: wrap; gap: 32px; justify-content: space-between; align-items: flex-start; }
.footer .brand .name { font-size: 1rem; }
.footer-note { max-width: 38ch; margin-top: 16px; line-height: 1.55; }
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col h5 { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 14px; font-weight: 500; }
.footer-col a { display: block; color: var(--ink-mid); margin-bottom: 9px; font-size: 0.92rem; }
.footer-col a:hover { color: var(--ink); }
.footer-base { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line-soft); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-faint); letter-spacing: 0.02em; }

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
body.no-motion * { animation: none !important; }
body.no-motion .codex-bar .live::before { animation: none !important; }

/* mobile: disable scanlines and fixed backgrounds to prevent jitter/banding */
@media (max-width: 820px) {
  .atmos {
    background-attachment: scroll;
    background:
      /* warm sodium pool, upper-right */
      radial-gradient(60% 55% at 82% 8%, color-mix(in oklch, var(--acc) 26%, transparent) 0%, transparent 60%),
      /* secondary warm bleed, mid-left */
      radial-gradient(48% 40% at 6% 46%, color-mix(in oklch, var(--acc) 12%, transparent) 0%, transparent 65%),
      /* cold blue depth, lower field */
      radial-gradient(70% 60% at 50% 116%, oklch(0.5 0.11 256 / 0.22) 0%, transparent 60%),
      /* cold haze wash at very top */
      linear-gradient(180deg, oklch(0.3 0.04 258 / 0.18) 0%, transparent 22%);
  }
  .btn-primary::after {
    display: none;
  }
  body::after {
    display: none;
  }
  .glass::before, .glass::after {
    animation: none;
  }
}