* , *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur-base) var(--ease), color var(--dur-base) var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

code, pre, kbd { font-family: var(--font-mono); }

::selection { background: var(--primary-soft); color: var(--text); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--primary-border); }

:focus-visible {
  outline: 2px solid var(--primary-strong);
  outline-offset: 2px;
  border-radius: 4px;
}

/* RTL: code stays LTR even inside an RTL document */
[dir="rtl"] pre,
[dir="rtl"] code,
[dir="rtl"] .code-block,
[dir="rtl"] .mono-ltr {
  direction: ltr;
  text-align: left;
  unicode-bidi: isolate;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

.visually-hidden {
  position: absolute;
  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;
  top: -48px;
  left: var(--sp-4);
  background: var(--primary);
  color: var(--on-primary);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-sm);
  z-index: 300;
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: var(--sp-3); }

main[data-page] {
  min-height: calc(100vh - var(--header-h));
}
.page-transition {
  animation: page-in 220ms var(--ease);
}
@keyframes page-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.skeleton {
  border-radius: var(--r-sm);
  background: linear-gradient(90deg, var(--surface) 25%, var(--surface-2) 37%, var(--surface) 63%);
  background-size: 400% 100%;
  animation: skeleton-shine 1.4s ease infinite;
}
@keyframes skeleton-shine {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.eyebrow { color: var(--primary-strong); font-weight: 600; }

@media (max-width: 640px) {
  :root { --header-h: 56px; }
  .container { padding-inline: var(--sp-4); }
}