/* Shared site responsive + animation styles */

/* Mobile breakpoint */
@media (max-width: 760px) {
  .os-site-header {
    padding: 16px 20px !important;
  }
  .os-site-header .os-burger { display: inline-block !important; }
  .os-site-header .os-nav {
    display: none !important;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start !important;
    gap: 4px !important;
    padding-top: 16px;
  }
  .os-site-header .os-nav.os-nav-open { display: flex !important; }
  .os-site-footer {
    grid-template-columns: 1fr !important;
    padding: 40px 20px 32px !important;
    gap: 28px !important;
  }
}

/* Reveal-on-scroll for slabs */
.os-reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.7, 0.2, 1),
              transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
  will-change: opacity, transform;
}
.os-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Subtle stagger via animation-delay set inline */
.os-reveal[data-delay="1"] { transition-delay: 0.05s; }
.os-reveal[data-delay="2"] { transition-delay: 0.10s; }
.os-reveal[data-delay="3"] { transition-delay: 0.15s; }
.os-reveal[data-delay="4"] { transition-delay: 0.20s; }
.os-reveal[data-delay="5"] { transition-delay: 0.25s; }

/* Slab parallax stripe shimmer on hover */
@keyframes os-shimmer {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* Hero entry animation */
@keyframes os-fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
.os-hero-enter > * {
  animation: os-fade-up 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.os-hero-enter > *:nth-child(1) { animation-delay: 0.0s; }
.os-hero-enter > *:nth-child(2) { animation-delay: 0.08s; }
.os-hero-enter > *:nth-child(3) { animation-delay: 0.16s; }

/* Respect motion preferences */
@media (prefers-reduced-motion: reduce) {
  .os-reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .os-hero-enter > * { animation: none !important; }
}

/* Mobile-tuned slab rows */
@media (max-width: 760px) {
  .slab-row {
    grid-template-columns: 6px 1fr !important;
  }
  .slab-row .slab-num,
  .slab-row .slab-meta,
  .slab-row .slab-arrow {
    display: none !important;
  }
  .slab-row .slab-body {
    padding: 28px 20px !important;
  }
  .slab-row h2 {
    font-size: 32px !important;
  }
  .slab-row p {
    font-size: 15px !important;
  }
  .slabs-hero {
    padding: 28px 20px 20px !important;
  }
}

/* Hide mobile-only / desktop-only helpers */
.os-mobile-only { display: none; }
@media (max-width: 760px) {
  .os-mobile-only { display: block; }
  .os-desktop-only { display: none !important; }
}

/* Mobile slab meta strip — only visible on mobile, styled as flex */
.slab-mobile-meta {
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--os-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--os-bone-soft);
}
@media (max-width: 760px) {
  .slab-mobile-meta { display: flex !important; }
}

/* Scroll progress bar at top */
.os-scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--os-green), var(--os-green-bright));
  z-index: 100;
  transition: width 0.1s linear;
  pointer-events: none;
}