/* ============================================================
   LAYOUT v2 - Reset, grid system, containers, responsive.
   Mobile-first. Breakpoints: 640 / 768 / 1024.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--bg-body);
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition:
    background-color var(--duration-slow) var(--ease-default),
    color var(--duration-slow) var(--ease-default);
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

a:hover { color: var(--brand-warm); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Sections */
.section { padding: var(--space-20) 0; }
.section--lg { padding: var(--space-32) 0; }

/* Grid */
.grid { display: grid; gap: var(--space-6); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: repeat(2, 1fr); }

/* Screen reader only */
.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;
}
.sr-only:focus {
  position: absolute;
  top: 0;
  left: 0;
  width: auto;
  height: auto;
  padding: 8px 16px;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: nowrap;
  background: var(--brand-accent);
  color: var(--brand-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  z-index: 9999;
  text-decoration: none;
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

/* Responsive */
@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .section { padding: var(--space-24) 0; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}