/* NodeDrift Design Tokens
 * Deep-tech aesthetic, Linear-inspired fine details.
 */

:root {
  /* Base surfaces — cool blue-black gradient */
  --bg-0: #07090F;
  --bg-1: #0B0F1A;
  --bg-2: #0E1220;
  --bg-3: #151B2E;
  --bg-4: #1C2340;

  /* Ink (foreground) */
  --ink-0: #F2F4FA;
  --ink-1: #D6DBEA;
  --ink-2: #9AA3BE;
  --ink-3: #6B7490;
  --ink-4: #434B65;
  --ink-5: #2A3150;

  /* Accents — tweakable */
  --accent: oklch(0.78 0.16 220);      /* cyan-blue */
  --accent-soft: oklch(0.78 0.16 220 / 0.15);
  --accent-glow: oklch(0.78 0.16 220 / 0.4);
  --accent-2: oklch(0.72 0.22 340);    /* magenta */
  --accent-3: oklch(0.82 0.17 150);    /* mint */

  /* Borders */
  --line-0: rgba(255,255,255,0.04);
  --line-1: rgba(255,255,255,0.08);
  --line-2: rgba(255,255,255,0.14);
  --line-3: rgba(255,255,255,0.22);

  /* Type */
  --f-sans: 'Geist', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --f-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
  --f-serif: 'Instrument Serif', 'Times New Roman', serif;

  /* Radii */
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 20px;
  --r-2xl: 28px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 24px 64px rgba(0,0,0,0.5);
  --glow: 0 0 32px var(--accent-glow);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 140ms;
  --dur-med: 280ms;
  --dur-slow: 560ms;

  /* Layout */
  --container: 1280px;
  --gutter: 24px;
}

/* Light mode override */
:root[data-theme="light"] {
  --bg-0: #F7F8FB;
  --bg-1: #FFFFFF;
  --bg-2: #F2F4F9;
  --bg-3: #E8ECF4;
  --bg-4: #DCE2ED;

  --ink-0: #0A0E1A;
  --ink-1: #1B2238;
  --ink-2: #434B65;
  --ink-3: #6B7490;
  --ink-4: #9AA3BE;
  --ink-5: #C5CCDD;

  --line-0: rgba(10,14,26,0.04);
  --line-1: rgba(10,14,26,0.08);
  --line-2: rgba(10,14,26,0.14);
  --line-3: rgba(10,14,26,0.22);
}

/* Accent swaps via data-accent */
:root[data-accent="cyan"]    { --accent: oklch(0.78 0.16 220); --accent-2: oklch(0.72 0.22 340); --accent-3: oklch(0.82 0.17 150); }
:root[data-accent="violet"]  { --accent: oklch(0.72 0.20 290); --accent-2: oklch(0.78 0.18 200); --accent-3: oklch(0.80 0.18 60);  }
:root[data-accent="lime"]    { --accent: oklch(0.88 0.20 130); --accent-2: oklch(0.72 0.22 340); --accent-3: oklch(0.78 0.16 220); }
:root[data-accent="amber"]   { --accent: oklch(0.80 0.18 70);  --accent-2: oklch(0.72 0.20 10);  --accent-3: oklch(0.78 0.16 220); }
:root[data-accent="rose"]    { --accent: oklch(0.72 0.22 10);  --accent-2: oklch(0.78 0.18 290); --accent-3: oklch(0.82 0.17 150); }

/* Font pair swaps */
:root[data-typeset="geist"]     { --f-sans: 'Geist','Inter',sans-serif; --f-display: 'Geist','Inter',sans-serif; }
:root[data-typeset="serif-mix"] { --f-sans: 'Inter',sans-serif;         --f-display: 'Instrument Serif',serif; }
:root[data-typeset="mono"]      { --f-sans: 'Inter',sans-serif;         --f-display: 'JetBrains Mono',monospace; }

/* Accent derived */
:root {
  --accent-soft: color-mix(in oklch, var(--accent) 18%, transparent);
  --accent-glow: color-mix(in oklch, var(--accent) 45%, transparent);
  --accent-2-soft: color-mix(in oklch, var(--accent-2) 18%, transparent);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--ink-0);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'ss01','cv11';
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; }

::selection { background: var(--accent-soft); color: var(--ink-0); }

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 10px; border: 2px solid var(--bg-0); }
::-webkit-scrollbar-thumb:hover { background: var(--ink-5); }

/* Utility classes */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.mono { font-family: var(--f-mono); font-feature-settings: 'ss01','ss02'; letter-spacing: -0.01em; }
.serif { font-family: var(--f-serif); }
.tabular { font-variant-numeric: tabular-nums; }

.eyebrow {
  font-family: var(--f-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 999px;
  box-shadow: 0 0 8px var(--accent-glow);
}

.grid-bg {
  background-image:
    linear-gradient(var(--line-0) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-0) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* Global pointer light — applied to <body> via JS */
.pointer-light::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(
    600px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in oklch, var(--accent) 10%, transparent),
    transparent 60%
  );
  transition: opacity var(--dur-med) var(--ease-out);
}

/* Fade-in on scroll base */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 800ms var(--ease-out), transform 800ms var(--ease-out);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* Section spacing */
.section {
  position: relative;
  padding: 120px 0;
}
@media (max-width: 720px) {
  .section { padding: 72px 0; }
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Hide SVG titles etc */
[hidden] { display: none !important; }