/* ==========================================================================
   base.css — resets, typography baseline, layout primitives
   ========================================================================== */

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.55; /* Thai body copy */
  letter-spacing: 0;
  color: var(--color-ink);
  background: var(--color-page);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 var(--space-3);
  color: var(--color-ink);
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-3); }

a {
  color: var(--color-brand-strong);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

ul, ol { margin: 0 0 var(--space-3); padding-left: var(--space-5); }

img, svg { max-width: 100%; display: block; }

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

/* Long Thai names must wrap cleanly */
.name-wrap, [data-wrap] {
  overflow-wrap: anywhere;
}

/* ---- Layout containers ---- */
.container {
  width: 100%;
  max-width: var(--maxw-student);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.container--teacher {
  max-width: var(--maxw-teacher);
}

.section { padding-block: var(--space-6); }
.section--tight { padding-block: var(--space-5); }

/* Hide visually but keep for screen readers */
.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;
}

/* Respect reduced motion (DESIGN.md 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;
  }
}