/* Header Structure */
.site-header {
  background-color: var(--c-bg-surface);
  border-bottom: 1px solid var(--c-border);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Logo */
.logo-text {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--ts-xl);
  color: var(--c-text-main);
  text-transform: uppercase;
  letter-spacing: -0.05em;
}

/* Navigation (Desktop) */
.header-nav {
  display: none;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: var(--space-6);
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: var(--ts-sm);
  font-weight: 600;
  color: var(--c-text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) 0;
  position: relative;
}

.nav-link:hover {
  color: var(--c-primary);
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--c-primary);
  transition: width var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

/* Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.action-link {
  font-size: var(--ts-lg);
  color: var(--c-text-main);
  padding: var(--space-2);
  border-radius: var(--radius);
}

.action-link:hover {
  color: var(--c-primary);
  background-color: var(--c-bg-body);
  text-decoration: none;
}

/* Search */
.search-form {
  display: none;
}

/* Mobile Toggle */
.mobile-toggle {
  background: none;
  border: none;
  font-size: var(--ts-xl);
  color: var(--c-text-main);
  cursor: pointer;
  padding: var(--space-2);
  display: flex;
}

/* Responsive: Desktop */
@media (min-width: 992px) {
  .header-nav {
    display: block;
  }

  .mobile-toggle {
    display: none;
  }

  .search-form {
    display: block;
  }
  
  .search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
  }

  .search-input {
    padding-right: var(--space-8);
    width: 200px;
    font-size: var(--ts-xs);
    height: 36px;
  }

  .search-btn {
    position: absolute;
    right: var(--space-2);
    background: none;
    border: none;
    color: var(--c-text-muted);
    cursor: pointer;
  }
  
  .search-btn:hover {
    color: var(--c-primary);
  }
}

/* Mobile Navigation State */
.header-nav.is-open {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--c-bg-surface);
  border-bottom: 1px solid var(--c-border);
  padding: var(--space-4);
  box-shadow: var(--shadow-md);
  animation: slideDown 0.2s ease-out forwards;
}

.header-nav.is-open .nav-list {
  flex-direction: column;
  gap: var(--space-2);
}

.header-nav.is-open .nav-link {
  display: block;
  padding: var(--space-3);
  border-bottom: 1px solid var(--c-bg-body);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}