/* ============================================================================
   Chemmus & Chuppas — Base / reset / elements
   Loaded after tokens.css. Uses custom properties only (no raw hex).
   ============================================================================ */

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-200);
  line-height: var(--lh-body);
  font-weight: var(--fw-regular);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  line-height: var(--lh-tight);
  font-weight: var(--fw-medium);
  margin: 0 0 var(--space-4);
}
h1 { font-size: var(--fs-800); }
h2 { font-size: var(--fs-600); }
h3 { font-size: var(--fs-500); }
h4 { font-size: var(--fs-400); }

p { margin: 0 0 var(--space-4); max-width: var(--content-measure); }

a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: color-mix(in srgb, var(--color-accent) 80%, var(--cc-black)); }

img, picture, svg, video { max-width: 100%; height: auto; display: block; }

ul, ol { padding-inline-start: 1.25rem; }

/* --- Accessibility: visible focus, skip link, reduced motion --- */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -60px;
  background: var(--color-heading);
  color: var(--cc-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: var(--z-toast);
  transition: top var(--dur-fast) var(--ease-standard);
}
.skip-link:focus { top: var(--space-3); }

.screen-reader-text {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

@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;
  }
}

/* --- Layout primitives --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.flow > * + * { margin-top: var(--space-4); }

.visually-hidden { /* alias */ }

/* --- Buttons (base component; variants extended later) --- */
.btn {
  --btn-bg: var(--color-heading);
  --btn-fg: var(--cc-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;              /* accessible touch target */
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-200);
  line-height: 1;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard);
}
.btn:hover { background: color-mix(in srgb, var(--btn-bg) 88%, var(--cc-black)); }
.btn:active { transform: translateY(1px); }

.btn--secondary {
  --btn-bg: transparent;
  --btn-fg: var(--color-heading);
  border-color: var(--color-heading);
}
.btn--accent { --btn-bg: var(--color-accent); }

/* --- Site skeleton --- */
.site-header,
.site-footer { background: var(--color-surface); }
.site-main { display: block; min-height: 40vh; }

.section { padding-block: var(--space-8); }
.section--tint { background: var(--color-surface-alt); }