/* =========================================
   Design tokens — From Sand to Superintelligence
   Subject-derived palette: silicon (cool slate), copper (warm), EUV (violet)
   ========================================= */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem;  --space-8: 2rem;    --space-10: 2.5rem;
  --space-12: 3rem;   --space-16: 4rem;   --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem;     --radius-full: 9999px;

  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 980px;
  --content-wide: 1240px;
  --content-full: 100%;

  --font-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;
}

:root,
[data-theme='light'] {
  /* Surfaces — warm paper, like a research notebook */
  --color-bg: #f6f3ed;
  --color-surface: #faf7f1;
  --color-surface-2: #fdfbf6;
  --color-surface-offset: #ece7dd;
  --color-surface-offset-2: #e3ddd1;
  --color-surface-dynamic: #d8d2c5;
  --color-divider: #d8d3c7;
  --color-border: #c4bfb3;

  /* Text — deep ink */
  --color-text: #1a1814;
  --color-text-muted: #6a6660;
  --color-text-faint: #a8a49b;
  --color-text-inverse: #faf7f1;

  /* Primary — silicon blue (cool, deep, technical) */
  --color-primary: #1f4a6b;
  --color-primary-hover: #163750;
  --color-primary-active: #0d2536;
  --color-primary-highlight: #cbd6df;

  /* Copper — warm contrast, the metallurgy color */
  --color-accent-copper: #a04a1a;
  --color-accent-copper-soft: #e8d3c0;

  /* EUV violet — for high-energy, lithography moments */
  --color-accent-euv: #5b3a8a;
  --color-accent-euv-soft: #ddd4ea;

  /* Quartz — bright neutral for highlights */
  --color-accent-quartz: #c9b15a;

  /* Plasma — etching/heat */
  --color-accent-plasma: #c43d5b;

  --shadow-sm: 0 1px 2px rgba(40, 30, 15, 0.06);
  --shadow-md: 0 4px 14px rgba(40, 30, 15, 0.08);
  --shadow-lg: 0 18px 40px rgba(40, 30, 15, 0.12);

  --grid-line: rgba(26, 24, 20, 0.06);
}

[data-theme='dark'] {
  /* Surfaces — deep graphite, like a fab cleanroom at night */
  --color-bg: #0e1116;
  --color-surface: #141821;
  --color-surface-2: #1a1f29;
  --color-surface-offset: #1d2330;
  --color-surface-offset-2: #232938;
  --color-surface-dynamic: #2a3142;
  --color-divider: #232938;
  --color-border: #353d50;

  --color-text: #d8dde6;
  --color-text-muted: #8a92a3;
  --color-text-faint: #5a6273;
  --color-text-inverse: #14181f;

  --color-primary: #6ba3cc;
  --color-primary-hover: #8fbedb;
  --color-primary-active: #b3d3e8;
  --color-primary-highlight: #1f3144;

  --color-accent-copper: #d97a3c;
  --color-accent-copper-soft: #3a2b20;

  --color-accent-euv: #a487d8;
  --color-accent-euv-soft: #2c2440;

  --color-accent-quartz: #e0c878;

  --color-accent-plasma: #e85f7d;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 40px rgba(0, 0, 0, 0.6);

  --grid-line: rgba(255, 255, 255, 0.04);
}

/* base reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -moz-text-size-adjust: none; -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: 5rem;
}
body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  text-wrap: balance;
  line-height: 1.12;
  letter-spacing: -0.01em;
}
p, li, figcaption { text-wrap: pretty; max-width: 68ch; }
a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: color-mix(in oklab, var(--color-primary) 30%, transparent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-color: var(--color-primary); }
::selection { background: color-mix(in oklab, var(--color-accent-copper) 35%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
a, button, [role='button'], [role='link'], input, textarea, select {
  transition: color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}