/* ============================================================
   Horsiq — Base
   Reset + typography + layout primitives.
   Requires tokens.css loaded first.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  font-size: 16px;
}

@media (min-width: 1024px) {
  html { font-size: 17px; }
}

body {
  margin: 0;
  background-color: var(--color-paper);
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--lh-body);
  font-weight: var(--weight-regular);
  font-feature-settings: 'kern', 'liga', 'calt', 'ss01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Paper texture — subtle noise overlay on background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--z-overlay);
  opacity: 0.04;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  mix-blend-mode: multiply;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: none; padding: 0; cursor: pointer; }

/* ---------- Typography ---------- */

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  color: var(--color-ink);
  text-wrap: balance;
}

h1 { font-size: var(--text-h1); line-height: var(--lh-display); letter-spacing: var(--tracking-heading); }
h2 { font-size: var(--text-h2); line-height: var(--lh-heading); letter-spacing: var(--tracking-heading); }
h3 { font-size: var(--text-h3); line-height: var(--lh-heading); letter-spacing: -0.005em; }
h4 { font-size: var(--text-h4); line-height: var(--lh-heading); }

p {
  margin: 0;
  text-wrap: pretty;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}
a:hover { color: var(--color-link-hover); }

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

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

/* ---------- Layout primitives ---------- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--section-px);
}

.container--narrow { max-width: var(--container-narrow); }
.container--prose  { max-width: var(--container-prose); }

.section {
  padding-block: var(--section-py);
  position: relative;
}

.section--paper-warm { background-color: var(--color-paper-warm); }
.section--paper-cool { background-color: var(--color-paper-cool); }
.section--dark {
  background-color: var(--color-dark);
  color: var(--color-dark-paper);
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 {
  color: var(--color-dark-paper);
}

/* ---------- Utility ---------- */

.display-xl { font-family: var(--font-display); font-size: var(--text-display-xl); line-height: var(--lh-tight);   letter-spacing: var(--tracking-display); font-weight: var(--weight-regular); color: var(--color-ink); text-wrap: balance; }
.display-lg { font-family: var(--font-display); font-size: var(--text-display-lg); line-height: var(--lh-tight);   letter-spacing: var(--tracking-display); font-weight: var(--weight-regular); color: var(--color-ink); text-wrap: balance; }
.display-md { font-family: var(--font-display); font-size: var(--text-display-md); line-height: var(--lh-display); letter-spacing: var(--tracking-heading); font-weight: var(--weight-regular); color: var(--color-ink); text-wrap: balance; }

.lead { font-size: var(--text-lead); line-height: 1.5; color: var(--color-ink-soft); }
.small { font-size: var(--text-small); }
.caption {
  font-size: var(--text-caption);
  letter-spacing: var(--tracking-caption);
  text-transform: uppercase;
  color: var(--color-ink-muted);
  font-weight: var(--weight-medium);
}

.muted { color: var(--color-ink-muted); }

.divider { border: 0; border-top: var(--border-thin); margin-block: var(--space-7); }

.serif { font-family: var(--font-display); }
.mono  { font-family: var(--font-mono); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Reveal animation base (used by motion.js) ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}