/* ==========================================================================
   base.css — fonts, reset, typography, layout primitives, motion prefs
   ========================================================================== */

/* ---------- Self-hosted fonts (latin subset, variable weight) ---------- */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("/assets/fonts/SpaceGrotesk-Variable.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/assets/fonts/Inter-Variable.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/JetBrainsMono-Variable.woff2") format("woff2");
}

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
}

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

img,
picture,
svg,
video,
canvas { display: block; max-width: 100%; }

img { height: auto; }

button,
input,
select,
textarea { font: inherit; color: inherit; }

button { cursor: pointer; background: none; border: 0; padding: 0; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--accent-strong); }

ul[role="list"],
ol[role="list"] { list-style: none; padding: 0; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-head);
  text-wrap: balance;
  color: var(--text);
}

h1 { font-size: var(--fs-h1); font-weight: 700; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); letter-spacing: -0.01em; }
h4 { font-size: 1.0625rem; letter-spacing: 0; }

p { text-wrap: pretty; max-width: 68ch; }

.lead { font-size: var(--fs-lead); line-height: 1.55; color: var(--text-muted); }
.muted { color: var(--text-muted); }
.small { font-size: var(--fs-small); }
.nowrap { white-space: nowrap; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: .92em;
  font-feature-settings: "liga" 0;
}

::selection { background: var(--accent); color: var(--on-accent); }

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
:focus:not(:focus-visible) { outline: none; }

/* ---------- Layout primitives ---------- */
.container {
  width: 100%;
  max-width: calc(var(--maxw) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
@media (min-width: 768px) {
  .container { --gutter: 24px; }
}
@media (min-width: 1024px) {
  .container { --gutter: 32px; }
}

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

.section__head {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
@media (min-width: 768px) {
  .section__head { margin-bottom: var(--space-12); }
}

/* Page content sits above the fixed 3D canvas (z-index 0) */
.site-header,
.site-main,
.site-footer { position: relative; z-index: var(--z-content); }

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

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: var(--z-skip);
  padding: var(--space-3) var(--space-4);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--dur-fast) var(--ease-out);
}
.skip-link:focus-visible { transform: translateY(0); outline-offset: 2px; }

/* ---------- Scroll reveal (only when JS is on; no-JS shows everything) ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- Reduced motion: final states, no animation ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}