/* ═══════════════════════════════════════
   LatexCraft v4.0 — base.css
   Reset, body, scrollbars, selection, transitions
   ═══════════════════════════════════════ */

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

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg-base);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--t-base) var(--ease-snap), color var(--t-base) var(--ease-snap);
}

#root {
  height: 100vh;
  width: 100vw;
}

/* Scrollbars */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }

/* Selection */
::selection { background: var(--accent-glow); color: var(--text-primary); }
::-moz-selection { background: var(--accent-glow); color: var(--text-primary); }

/* Focus */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Utility */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

button { font-family: inherit; font-size: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }

/* No transitions on initial paint to avoid flash */
.no-transitions * { transition: none !important; }