/* ============================================================
   Cortex — unified dark design tokens
   ============================================================ */

:root {
  /* Single warm-dark palette — no light surfaces anywhere */
  --bg: oklch(0.145 0.005 80);
  --bg-elev: oklch(0.185 0.006 80);
  --bg-elev-2: oklch(0.215 0.007 80);
  --line: oklch(0.28 0.008 80);
  --line-soft: oklch(0.225 0.007 80);
  --fg: oklch(0.96 0.004 80);
  --fg-mute: oklch(0.74 0.006 80);
  --fg-dim: oklch(0.55 0.008 80);

  --accent: oklch(0.78 0.16 145);
  --accent-2: oklch(0.78 0.14 70);
  --accent-soft: oklch(0.78 0.16 145 / 0.12);

  --font-sans: "Geist", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --density: 1;
  --space-1: calc(4px * var(--density));
  --space-2: calc(8px * var(--density));
  --space-3: calc(12px * var(--density));
  --space-4: calc(16px * var(--density));
  --space-5: calc(24px * var(--density));
  --space-6: calc(32px * var(--density));
  --space-8: calc(48px * var(--density));
  --space-10: calc(72px * var(--density));
  --space-12: calc(96px * var(--density));

  --radius: 6px;
  --radius-lg: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body { font-feature-settings: "ss01", "cv01", "cv11"; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent-soft); color: var(--fg); }

.mono { font-family: var(--font-mono); font-feature-settings: "calt"; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-6); }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 var(--space-6); }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  max-width: 1200px; margin: 0 auto; gap: var(--space-5);
}
.nav-brand {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono); font-weight: 600;
  letter-spacing: -0.01em; font-size: 14.5px;
}
.nav-brand .dot {
  width: 9px; height: 9px; border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 22%, transparent);
}
.nav-links { display: flex; align-items: center; gap: var(--space-5); font-size: 13.5px; color: var(--fg-mute); }
.nav-links a:hover { color: var(--fg); }
.nav-cta {
  font-family: var(--font-mono); font-size: 12.5px;
  padding: 6px 11px;
  border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--fg);
  display: inline-flex; align-items: center; gap: 7px;
  transition: background 0.12s, border-color 0.12s;
}
.nav-cta:hover { border-color: var(--accent); background: var(--accent-soft); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px; font-weight: 500;
  border: 1px solid var(--line);
  background: var(--bg-elev); color: var(--fg);
  cursor: pointer;
  transition: all 0.14s ease;
}
.btn:hover { border-color: var(--accent); background: var(--bg-elev-2); }
.btn-primary {
  background: var(--accent); color: var(--bg);
  border-color: var(--accent); font-weight: 600;
}
.btn-primary:hover {
  background: oklch(0.84 0.16 145);
  border-color: oklch(0.84 0.16 145);
}

/* Eyebrow */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11.5px;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--fg-mute);
  padding: 4px 10px;
  border: 1px solid var(--line-soft); border-radius: 100px;
  background: var(--bg-elev);
}
.eyebrow .pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 60%, transparent); }
  70% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  letter-spacing: -0.025em; font-weight: 600;
  line-height: 1.05; margin: 0;
}
.h-display {
  font-size: clamp(40px, 6vw, 76px);
  letter-spacing: -0.035em;
  font-weight: 600; line-height: 0.98;
}
.h-display .accent { color: var(--accent); }

.section-title {
  font-size: clamp(26px, 3.2vw, 38px);
  letter-spacing: -0.025em;
  margin-bottom: var(--space-3);
}
.section-sub {
  color: var(--fg-mute);
  font-size: 16px;
  max-width: 60ch;
  line-height: 1.55;
}

section { padding: var(--space-12) 0; position: relative; }

/* Section head — consistent across all sections */
.section-head {
  margin-bottom: var(--space-8);
  display: flex; flex-direction: column;
  align-items: flex-start; gap: var(--space-3);
}

/* Code chip / install line */
.code-chip {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 12px 14px 12px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px; color: var(--fg);
  cursor: pointer;
  transition: border-color 0.14s;
  width: 100%;
  text-align: left;
}
.code-chip:hover { border-color: var(--accent); }
.code-chip .prompt { color: var(--accent); }
.code-chip__cmd {
  white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; flex: 1;
}
.code-chip .copy {
  margin-left: auto;
  font-size: 10.5px; color: var(--fg-dim);
  padding: 3px 7px;
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.code-chip.copied .copy { color: var(--accent); border-color: var(--accent); }

/* Footer */
footer {
  border-top: 1px solid var(--line-soft);
  padding: var(--space-6) 0;
  background: var(--bg);
  color: var(--fg-mute);
  font-size: 13px;
}
.footer-inner {
  display: flex; justify-content: space-between;
  align-items: center; gap: var(--space-5);
  flex-wrap: wrap;
}

.muted { color: var(--fg-mute); }
.mono-tag {
  font-family: var(--font-mono);
  font-size: 11.5px; color: var(--fg-dim);
  letter-spacing: 0.04em; text-transform: uppercase;
}

/* Subtle terminal scanlines, used very sparingly */
.scanlines::before {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px, transparent 3px,
    rgba(255,255,255,0.012) 3px, rgba(255,255,255,0.012) 4px
  );
}