/* layout.css — Navigation, footer, shared layout */

/* Skip-to-content link (keyboard / screen-reader accessibility) */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--color-brand);
  color: #0d0d0f;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  border-radius: 0 0 var(--radius-md) 0;
  text-decoration: none;
  transition: top 0.15s;
}
.skip-link:focus {
  top: 0;
}

/* Screen-reader only — visually hidden but accessible to AT */
.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;
}

/* Nav */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: background var(--duration-base), border-color var(--duration-base), backdrop-filter var(--duration-base);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(13, 13, 15, 0.7);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom-color: var(--color-border);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.nav-logo {
  background: none;
  cursor: pointer;
  display: flex;
  align-items: center;
}

.nav-links {
  display: none;
  gap: var(--space-6);
  flex: 1;
  margin-left: var(--space-7);
}

.nav-link {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 8px 0;
  position: relative;
  transition: color var(--duration-base);
  letter-spacing: -0.01em;
}
.nav-link:hover { color: var(--color-text-primary); }
.nav-link.active { color: var(--color-text-primary); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 2px;
  background: var(--color-brand);
  border-radius: 2px;
}

.nav-cta { display: none; }
.nav-burger {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  transition: background var(--duration-base);
}
.nav-burger:hover { background: var(--color-bg-elevated); }

@media (min-width: 768px) {
  .nav-links, .nav-cta { display: flex; align-items: center; }
  .nav-burger { display: none; }
}

/* Mobile drawer */
.mobile-drawer {
  position: fixed; inset: 0;
  background: var(--color-overlay);
  z-index: 200;
  display: flex;
  justify-content: flex-end;
}
.mobile-drawer-panel {
  width: 280px;
  height: 100%;
  padding: var(--space-7) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  border-radius: 0;
  border-left: 1px solid var(--color-border);
  position: relative;
}
.mobile-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  font-size: 24px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
}
.mobile-link {
  text-align: left;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text-primary);
  padding: 12px 0;
}

/* Footer */
.footer {
  position: relative;
  border-top: 1px solid var(--color-border);
  padding: var(--space-9) 0 var(--space-6);
  margin-top: var(--space-9);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-7);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .footer-brand { grid-column: 1 / -1; }
}
.footer-brand p { font-size: 14px; line-height: 1.6; }
.footer-mono {
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
}
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.footer-col button, .footer-col a {
  display: block;
  text-align: left;
  background: none;
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  text-decoration: none;
  transition: color var(--duration-base);
  font-family: var(--font-body);
  cursor: pointer;
}
.footer-col button:hover, .footer-col a:hover { color: var(--color-brand); }

.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Stat */
.stat-value {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  line-height: 1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: var(--space-3);
}

/* Wireframe Cube */
.wireframe-cube-scene {
  position: relative;
  perspective: 1200px;
  pointer-events: none;
}
.wireframe-cube {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  margin: auto;
  width: 60%;
  height: 60%;
}
.wf-face {
  position: absolute;
  inset: 0;
  border: 1.5px solid;
  background: transparent;
  overflow: hidden;
}
.wf-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,107,53,0.15) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,107,53,0.15) 1px, transparent 1px);
  background-size: 20% 20%;
}
.wf-front  { transform: translateZ(50%); }
.wf-back   { transform: rotateY(180deg) translateZ(50%); }
.wf-right  { transform: rotateY(90deg) translateZ(50%); }
.wf-left   { transform: rotateY(-90deg) translateZ(50%); }
.wf-top    { transform: rotateX(90deg) translateZ(50%); }
.wf-bottom { transform: rotateX(-90deg) translateZ(50%); }

/* Page transitions */
.page {
  padding-top: var(--nav-h);
  min-height: 100vh;
  position: relative;
  z-index: 2;
}