/* ============================================================
   site header: animates from centered hero to top-left logo
   states:
     .is-intro    -> huge centered, no menu
     .is-compact  -> small top-left, menu visible
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 28px;
  padding: 12px 28px;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.95) 0%, rgba(0,0,0,0.7) 80%, rgba(0,0,0,0) 100%);
  transition: padding 600ms cubic-bezier(0.7, 0, 0.2, 1);
}

.header-link {
  display: inline-block;
  line-height: 0;
  transition:
    transform 750ms cubic-bezier(0.7, 0, 0.2, 1),
    width 750ms cubic-bezier(0.7, 0, 0.2, 1);
  transform-origin: left center;
}

.header-image {
  display: block;
  width: 280px;
  height: auto;
  transition: width 750ms cubic-bezier(0.7, 0, 0.2, 1);
  pointer-events: none;
}

/* ---------- intro state (huge centered) ---------- */

.site-header.is-intro {
  position: fixed;
  inset: 0;
  height: 100vh;
  width: 100vw;
  padding: 0;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.985);
  flex-direction: column;
  gap: 20px;
}

.site-header.is-intro::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url('../assets/backgrounds/diy-1.jpeg');
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  pointer-events: none;
  z-index: -1;
}

.site-header.is-intro .header-link {
  transform: scale(1);
}

.site-header.is-intro .header-image {
  width: min(720px, 88vw);
}

.site-header.is-intro .site-nav {
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
}

.site-header.is-intro .intro-hint {
  display: block;
  font-family: var(--font-body);
  color: #aaa;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-top: 12px;
  animation: blink 1.4s ease-in-out infinite;
}

/* ---------- compact state (top-left + menu) ---------- */

.site-header.is-compact .header-image {
  width: 220px;
}

.site-header.is-compact .site-nav {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ---------- nav strip ---------- */

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 500ms ease 300ms,
    transform 500ms ease 300ms;
}

.nav-link {
  font-family: var(--font-title);
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #f0e9d9;
  text-decoration: none;
  padding: 4px 10px 2px;
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.nav-link:hover {
  color: #fff;
  border-color: #f0e9d9;
}

.nav-link.is-current {
  color: #fff;
  border-color: #f0e9d9;
  background: rgba(255,255,255,0.04);
}

.intro-hint { display: none; }

@keyframes blink {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 1; }
}

/* mobile */
@media (max-width: 600px) {
  .site-header.is-compact .header-image { width: 160px; }
  .nav-link { font-size: 0.95rem; }
  .site-nav { gap: 10px; }
}