/* =========================
   Header
========================= */
.site-header {
  background: rgba(5, 5, 5, 0.94);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner {
  width: min(100% - 56px, var(--max-width));
  margin: 0 auto;
  padding: 22px 0 18px;
}

.site-logo {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 18px;
}

.site-logo img {
  max-width: 240px;
  width: 100%;
  max-height: 84px;
  object-fit: contain;
  transform: translateY(0) scale(1);
  transform-origin: center center;
  transition:
    transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity 220ms ease,
    filter 280ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform, filter;
}

.site-logo:hover img,
.site-logo:focus img {
  transform: translateY(-1px) scale(1.035);
  filter: brightness(1.04);
}

.main-nav {
  display: flex;
  justify-content: center;
}

.nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 34px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--accent);
}

.has-dropdown > .nav-link::after {
  content: "▾";
  font-size: 0.72rem;
  position: relative;
  top: -1px;
}

.dropdown-menu {
  list-style: none;
  position: absolute;
  left: 50%;
  top: calc(100% + 10px);
  transform: translateX(-50%) translateY(8px);
  min-width: 285px;
  margin: 0;
  padding: 10px 0;
  background: #0d0d0d;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 220ms ease,
    transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
    visibility 220ms ease;
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: block;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--text);
  white-space: nowrap;
  transition:
    background var(--transition),
    color var(--transition);
}

.dropdown-menu a:hover,
.dropdown-menu a:focus {
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
}

.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* =========================
   Responsive
========================= */
@media (max-width: 900px) {
  .nav-list {
    gap: 16px 24px;
  }

  .dropdown-menu {
    min-width: 240px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    width: min(100% - 28px, var(--max-width));
    padding: 16px 0 12px;
  }

  .site-logo {
    margin-bottom: 14px;
  }

  .site-logo img {
    max-width: 200px;
  }

  .nav-list {
    gap: 10px 16px;
  }

  .nav-link {
    font-size: 0.76rem;
    letter-spacing: 0.1em;
  }
}