/* ==========================================================================
   Base — reset, typography, layout primitives, accessibility utilities
   Logical properties only (inline/block) so RTL ⇄ LTR needs no overrides.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-block-start: calc(var(--header-h) + var(--space-4));
  background: var(--color-bg);
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  min-block-size: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-text);
  background: var(--color-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;                   /* never horizontal overflow */
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

img, svg, video, picture { display: block; max-inline-size: 100%; block-size: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
p, h1, h2, h3, h4, h5, h6, li, dd, figcaption { overflow-wrap: break-word; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
table { border-collapse: collapse; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: var(--leading-tight);
  font-weight: var(--weight-bold);
  text-wrap: balance;
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-lg); font-weight: var(--weight-semibold); }
h4 { font-size: var(--text-md); font-weight: var(--weight-semibold); }
p  { text-wrap: pretty; }

a { color: var(--color-link); text-decoration-thickness: 1px; text-underline-offset: 0.25em; }
a:hover { color: var(--color-primary-hover); }

strong, b { font-weight: var(--weight-semibold); }
small { font-size: var(--text-sm); }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.875em; direction: ltr; unicode-bidi: isolate; }
hr { border: 0; border-block-start: 1px solid var(--color-border); }

/* Latin runs inside Arabic text (ISBNs, English titles) */
:lang(en) { font-family: var(--font-latin); }
.num, .isbn { font-variant-numeric: tabular-nums; }

/* ---------- Focus (WCAG 2.2 — 2.4.11 / 2.4.13) ---------- */
:focus { outline: none; }
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 6px;
}

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

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  inset-inline-start: var(--space-4);
  inset-block-start: -100px;
  z-index: 100;
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--radius-md);
  font-weight: var(--weight-semibold);
  text-decoration: none;
}
.skip-link:focus-visible { inset-block-start: var(--space-3); color: var(--color-on-primary); }

.visually-hidden {
  position: absolute !important;
  inline-size: 1px; block-size: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- Layout primitives ---------- */
.container {
  inline-size: 100%;
  max-inline-size: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide   { max-inline-size: calc(var(--container-wide) + var(--gutter) * 2); }
.container--narrow { max-inline-size: calc(var(--container-narrow) + var(--gutter) * 2); }

.section { padding-block: var(--section-gap); }
.section--tight { padding-block: calc(var(--section-gap) * 0.6); }
.section--alt { background: var(--color-bg-alt); }
.section + .section:not(.section--alt, .section--deep) { padding-block-start: 0; }

.stack > * + * { margin-block-start: var(--stack, var(--space-4)); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--cluster, var(--space-3)); align-items: center; }

.grid {
  display: grid;
  gap: var(--grid-gap, clamp(1rem, 0.6rem + 1.4vw, 1.75rem));
  grid-template-columns: repeat(auto-fill, minmax(min(var(--grid-min, 180px), 100%), 1fr));
}

.main { display: block; min-block-size: 50vh; }

/* ---------- Islamic geometric pattern (mask → themeable) ----------
   Main site pattern: supplied 8-fold rosette lattice, seamless 169px tile
   (assets/img/pattern-main.webp). --pattern-size keeps its historic scale;
   the tile is drawn at ×2.4 so each component's proportions are preserved. */
.pattern { position: relative; isolation: isolate; }
.pattern::before {
  content: "";
  position: absolute; inset: 0;
  z-index: -1;
  background-color: var(--pattern-color, var(--color-pattern));
  -webkit-mask: url("../img/pattern-main.webp") repeat center top;
  mask: url("../img/pattern-main.webp") repeat center top;
  -webkit-mask-size: calc(var(--pattern-size, 56px) * 2.4);
  mask-size: calc(var(--pattern-size, 56px) * 2.4);
  pointer-events: none;
}
.pattern--fade::before {
  -webkit-mask: url("../img/pattern-main.webp") repeat center top, linear-gradient(to bottom, #000 0%, transparent 85%);
  -webkit-mask-composite: source-in;
  mask: url("../img/pattern-main.webp") repeat center top, linear-gradient(to bottom, #000 0%, transparent 85%);
  mask-composite: intersect;
  -webkit-mask-size: calc(var(--pattern-size, 56px) * 2.4), 100% 100%;
  mask-size: calc(var(--pattern-size, 56px) * 2.4), 100% 100%;
}

/* Icons (inline SVG sprite-free: <svg class="icon"><use href="#i-search"/></svg>) */
.icon {
  inline-size: var(--icon, 1.25em);
  block-size: var(--icon, 1.25em);
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* Directional icons mirror in RTL */
[dir="rtl"] .icon--dir { transform: scaleX(-1); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  /* The spinner is a status indicator, not decoration: a frozen one reads as
     "nothing is happening". Keep it turning, slowly enough to be comfortable. */
  .spinner {
    animation-duration: 3s !important;
    animation-iteration-count: infinite !important;
  }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
}