/* ==========================================================================
   Algo Tools — Root / Reset
   Base element resets shared by every tool in the ecosystem.
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

html[lang="bn"] body,
[data-lang="bn"] body { font-family: var(--font-bn); }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

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

::selection { background: var(--c-accent); color: #06110C; }

:focus-visible {
  outline: 2px solid var(--c-accent-2);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

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

.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(--sp-4);
  top: -60px;
  background: var(--c-accent);
  color: #06110C;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--sp-4); }