/* bpi-layout.css — global layout primitives, reset, typography base */

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

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

body {
  font-family: var(--bpi-font-body);
  font-size: var(--bpi-body);
  line-height: 1.7;
  color: var(--bpi-fg-light-primary);
  background: var(--bpi-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Dark-top pages */
body.bpi-page--dark-top {
  background: var(--bpi-bg-dark);
}

/* Light-top pages — keep body white, nav forced solid */
body.bpi-page--light-top {
  background: var(--bpi-bg-white);
}

/* Container */
.bpi-container {
  width: 100%;
  max-width: var(--bpi-container-max);
  margin-inline: auto;
  padding-inline: var(--bpi-gutter);
}

.bpi-container--narrow {
  max-width: 760px;
}

.bpi-container--wide {
  max-width: 1400px;
}

/* Section padding */
.bpi-section {
  padding-block: var(--bpi-section-pad);
}

.bpi-section--dark {
  background: var(--bpi-bg-dark);
}

.bpi-section--dark-alt {
  background: var(--bpi-bg-dark-alt);
}

.bpi-section--light {
  background: var(--bpi-bg-light);
}

.bpi-section--white {
  background: var(--bpi-bg-white);
}

.bpi-section--compact-top {
  padding-top: 0;
}

/* Grid layouts */
.bpi-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.bpi-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.bpi-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .bpi-grid-2 { grid-template-columns: 1fr; }
  .bpi-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .bpi-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .bpi-grid-3 { grid-template-columns: 1fr; }
  .bpi-grid-4 { grid-template-columns: 1fr; }
}

/* Flex helpers */
.bpi-flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.bpi-flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Text alignment */
.bpi-text-center { text-align: center; }
.bpi-text-left { text-align: left; }

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

/* Fade-in animation + failsafe */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Failsafe: force-visible after 1.2s if JS doesn't trigger */
@keyframes bpi-force-visible {
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: bpi-force-visible 0s 1.2s forwards;
}

/* Image reset */
img {
  max-width: 100%;
  height: auto;
  display: block;
}