/* ==========================================================================
   Reset + base typography. Everything here is content-agnostic.
   ========================================================================== */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem; /* clears the sticky header on anchor jumps */
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: var(--leading-normal);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: tabular-nums;
  min-height: 100svh;
  overflow-x: hidden; /* belt-and-braces against a stray wide child */
}

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

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

p, li { text-wrap: pretty; }

/* --- Headings ----------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--weight-display);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text);
  text-wrap: balance;
}

h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-3); line-height: var(--leading-snug); }
h4 { font-size: var(--step-2); line-height: var(--leading-snug); letter-spacing: var(--tracking-snug); font-weight: var(--weight-bold); }
h5 { font-size: var(--step-1); line-height: var(--leading-snug); letter-spacing: var(--tracking-snug); font-weight: var(--weight-bold); }
h6 { font-size: var(--step-0); letter-spacing: var(--tracking-snug); font-weight: var(--weight-bold); }

/* --- Links -------------------------------------------------------------- */
a {
  color: var(--accent);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in oklab, var(--accent) 38%, transparent);
  transition: color var(--dur-fast) var(--ease-out),
              text-decoration-color var(--dur-fast) var(--ease-out);
}
a:hover {
  color: var(--accent-hover);
  text-decoration-color: currentColor;
}

/* --- Focus: visible, branded, never removed ----------------------------- */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
:focus:not(:focus-visible) { outline: none; }

::selection {
  background: color-mix(in oklab, var(--accent) 24%, transparent);
  color: var(--text);
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin-block: var(--sp-7);
}

blockquote {
  margin: 0;
  padding-left: var(--sp-5);
  border-left: 2px solid var(--highlight);
}

code, kbd, samp, pre { font-family: var(--font-mono); font-size: 0.9em; }

/* --- Skip link ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: var(--sp-4);
  z-index: 200;
  padding: var(--sp-3) var(--sp-4);
  background: var(--bg-raised);
  color: var(--text);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--dur) var(--ease-out);
}
.skip-link:focus-visible { transform: translateY(0); }

/* --- Screen-reader-only ------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}