*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  min-height: 100dvh;
  background:
    radial-gradient(1100px 640px at 100% -8%, #d9e9f0 0%, transparent 62%),
    radial-gradient(900px 620px at -8% 108%, #f0e0cf 0%, transparent 58%),
    linear-gradient(180deg, #f4f9fb, #e8f0f4);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3, h4 { line-height: 1.4; font-weight: 700; letter-spacing: -0.01em; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
[hidden] { display: none !important; }

/* متن‌های LTR داخل رابط RTL */
.ltr, [dir='ltr'] { direction: ltr; unicode-bidi: isolate; text-align: left; }
.ltr-inline { direction: ltr; unicode-bidi: isolate; display: inline-block; }
.mono { font-family: var(--font-mono); font-size: 0.92em; }
.num { font-feature-settings: 'tnum'; }

:focus-visible {
  outline: 3px solid var(--bro-400);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: 8px; inset-inline-start: 8px; z-index: 999;
  background: var(--ice-900); color: #fff; padding: 8px 16px; border-radius: var(--r-pill);
  transform: translateY(-200%); transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus { transform: none; }

::selection { background: var(--bro-200); color: var(--ink); }
* { scrollbar-width: thin; scrollbar-color: var(--ice-300) transparent; }

/* حرکت کم */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* اندازهٔ پیش‌فرض آیکن‌ها (کلاس‌های خاص بر آن غلبه دارند) */
:where(svg:not([width])) { width: 1.25em; height: 1.25em; flex: none; }
[tabindex='-1']:focus { outline: none; }