/* Base: reset, typography, page background, utilities. Mobile-first. */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* Keep anchored sections clear of the sticky header */
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Faint millimetre-paper grid: 10px minor lines, 50px major lines */
body,
.intro {
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px),
    linear-gradient(var(--color-grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-minor) 1px, transparent 1px);
  background-size: 50px 50px, 50px 50px, 10px 10px, 10px 10px;
}

h1, h2, h3, h4 {
  margin: 0 0 var(--space-4);
  color: var(--color-primary);
  line-height: var(--lh-tight);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur-fast) var(--ease);
}

a:hover {
  color: var(--color-primary-2);
}

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

button {
  font: inherit;
  color: inherit;
}

/* :where() keeps specificity at zero so component classes can set padding */
:where(ul[role="list"], ol[role="list"]) {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

/* Set by boot.js while the English dictionary loads, so Turkish text never flashes */
html.i18n-pending [data-i18n] {
  visibility: hidden;
}

/* Layout helpers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--space-8);
}

@media (min-width: 960px) {
  .section { padding-block: var(--space-9); }
}

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

.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 {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: var(--space-4);
  color: #fff;
}

@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;
  }
}