/* css/nav.css — header/nav/footer. Fixed, transparent + blurred nav over a dark theme (prisma.io reference) */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 14, 23, 0.35);
  border: 1px solid transparent;
  border-radius: 0;
  /* left/right/top always resolve to explicit lengths (never `auto`) so every
     property below can interpolate smoothly — CSS cannot animate to/from `auto`. */
  transition: top 380ms cubic-bezier(0.4, 0, 0.2, 1), left 380ms cubic-bezier(0.4, 0, 0.2, 1),
              right 380ms cubic-bezier(0.4, 0, 0.2, 1), border-radius 380ms cubic-bezier(0.4, 0, 0.2, 1),
              background-color 300ms ease, border-color 300ms ease,
              box-shadow 300ms ease, backdrop-filter 300ms ease;
}
.site-header.is-scrolled {
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
}
/* Floating pill: only on desktop widths — on scroll the bar detaches from the
   viewport edges, gains margin on all sides, and fully rounds its corners.
   left/right use max() instead of left:50%+transform so both states are plain
   animatable lengths (transform/auto pairs don't transition smoothly). */
@media (min-width: 768px) {
  .site-header.is-scrolled {
    top: 14px;
    left: max(20px, calc(50% - 560px));
    right: max(20px, calc(50% - 560px));
    border-radius: 16px;
  }
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-height); gap: var(--space-4);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-heading); font-weight: 700; font-size: 1.1rem;
  letter-spacing: 0.01em;
  color: var(--color-heading); text-decoration: none;
}
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: var(--radius-sm); flex-shrink: 0;
  background: var(--color-accent);
  color: #FFFFFF; font-family: var(--font-heading); font-weight: 700; font-size: 0.8rem;
}
.brand span { color: var(--color-accent); }

.site-nav { display: flex; }
.site-nav ul {
  list-style: none; display: flex; gap: var(--space-1);
  margin: 0; padding: 0;
}
.site-nav a {
  position: relative;
  display: inline-block;
  white-space: nowrap;
  color: var(--color-body); text-decoration: none; font-weight: 500; font-size: 0.875rem;
  padding: 8px 12px;
}
.site-nav a::after {
  content: "";
  position: absolute; left: 12px; right: 12px; bottom: 4px;
  height: 2px; background: var(--color-accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 200ms ease;
}
.site-nav a:hover { color: #FFFFFF; }
.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: #FFFFFF; }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.nav-cta { padding: 9px 18px; font-size: 0.875rem; white-space: nowrap; }

.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 44px; height: 44px; padding: 10px;
}
.nav-toggle span {
  display: block; width: 100%; height: 2px; background: var(--color-heading);
  border-radius: 1px; margin: 6px 0; transform-origin: center;
  transition: transform 200ms ease, opacity 150ms ease;
}
.nav-toggle.is-active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2) { opacity: 0; }
.nav-toggle.is-active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

@media (max-width: 1279px) {
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: rgba(10, 14, 23, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-md);
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height 250ms ease, opacity 150ms ease;
    max-width: 100vw;
  }
  .site-nav.is-open { max-height: 70vh; opacity: 1; overflow-y: auto; }
  .site-nav ul { flex-direction: column; gap: 2px; padding: var(--space-3) var(--space-5) var(--space-5); }
  .site-nav a {
    display: flex; align-items: center; min-height: 44px;
    white-space: normal; border-radius: var(--radius-sm); padding: 10px 12px;
  }
  .site-nav a::after { display: none; }
  .site-nav a[aria-current="page"] { background: var(--color-surface); }
}

.site-footer {
  background: var(--color-footer); color: var(--color-body);
  padding: var(--space-7) 0 var(--space-5);
  margin-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}
.site-footer a { color: #FFFFFF; text-decoration: none; }
.site-footer a:hover { color: var(--color-accent); text-decoration: underline; }
.footer-grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
.footer-grid h4 { color: #FFFFFF; font-size: 0.9375rem; margin-bottom: var(--space-3); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: var(--space-2); }
.footer-bottom {
  margin-top: var(--space-6); padding-top: var(--space-4);
  border-top: 1px solid var(--color-border); font-size: 0.8125rem; color: var(--color-tertiary);
}