/* ==========================================================================
   Base — font-face, reset, global element defaults, accessibility helpers
   ========================================================================== */

@font-face {
  font-family: "Inter";
  src: url("../fonts/Inter-Variable.woff2") format("woff2-variations"),
       url("../fonts/Inter-Variable.woff2") format("woff2");
  font-weight: 400 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/JetBrainsMono-Variable.woff2") format("woff2-variations"),
       url("../fonts/JetBrainsMono-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  min-height: 100svh;
  overflow-x: hidden;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background: var(--surface-page);
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
}

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

main,
section,
article,
aside,
header,
footer,
.container,
.grid,
.card,
.device-frame,
.showcase {
  min-width: 0;
}

svg text { font-family: var(--font-sans); }

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

button { cursor: pointer; }

button, [role="button"] { touch-action: manipulation; }

a { color: inherit; text-decoration: none; }

ul[class], ol[class] { list-style: none; padding: 0; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  text-wrap: balance;
}

p { text-wrap: pretty; }

p, li, dt, dd { max-width: 68ch; }

table { border-collapse: collapse; width: 100%; }

:target { scroll-margin-top: calc(var(--header-height) + var(--space-md)); }

/* ---- Focus visibility ---- */
:focus { outline: none; }

:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.dark-context:focus-visible,
[data-surface="dark"] :focus-visible {
  outline-color: var(--color-cyan-300);
}

/* ---- Screen-reader only utility ---- */
.visually-hidden {
  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 ---- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: var(--z-skiplink);
  background: var(--color-ink-900);
  color: var(--color-white);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
  transform: translateY(-150%);
  transition: transform var(--duration-base) var(--ease-out);
  box-shadow: var(--shadow-lg);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---- Selection ---- */
::selection {
  background: var(--color-cyan-400);
  color: var(--color-ink-950);
}

/* ---- Scrollbar (progressive enhancement, non-essential) ---- */
@media (pointer: fine) {
  ::-webkit-scrollbar { width: 12px; height: 12px; }
  ::-webkit-scrollbar-track { background: var(--surface-alt); }
  ::-webkit-scrollbar-thumb {
    background: var(--color-mist-300);
    border-radius: var(--radius-pill);
    border: 3px solid var(--surface-alt);
  }
  ::-webkit-scrollbar-thumb:hover { background: var(--color-mist-400); }
}

/* ---- No-JS safety net ---- */
.no-js .js-only { display: none !important; }
.js .no-js-only { display: none !important; }