/* ============================================
   Header - Modern & Clean
   ============================================ */

.header {
  grid-area: header;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  position: relative;
}

.header-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0.5rem var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "title header-actions" "nav nav";
  align-items: center;
  gap: 0.5rem;
}

.header-actions {
  grid-area: header-actions;
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

/* Title Section */
.title {
  grid-area: title;
  text-align: center;
}

.title h1 {
  margin-bottom: 0;
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.2;
}

.title h2 {
  font-size: clamp(0.75rem, 1.5vw, 0.875rem);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-normal);
  margin-bottom: 0;
  line-height: 1.2;
}

/* Mobile Filter Toggle */
.mobile-filter-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  color: var(--color-text);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.mobile-filter-toggle:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.mobile-filter-toggle[aria-expanded="true"] {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.mobile-filter-toggle svg {
  width: 20px;
  height: 20px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 8px;
  z-index: var(--z-dropdown);
  transition: all var(--transition-fast);
  position: relative;
}

.mobile-menu-toggle:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
}

.mobile-menu-toggle span {
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-menu-toggle:hover span {
  background: var(--color-primary);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Navigation */
.nav {
  grid-area: nav;
  display: none;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
}

.nav.active {
  display: flex;
}

.nav-link {
  display: block;
  padding: 0.375rem var(--spacing-sm);
  color: var(--color-text-muted);
  text-align: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
  font-size: 0.875rem;
}

.nav-link:hover,
.nav-link:focus {
  background: var(--color-bg-hover);
  color: var(--color-primary);
}

.nav-link:active {
  background: var(--color-bg-hover);
}

/* Tablet and Desktop */
@media (min-width: 768px) {
  .header-content {
    grid-template-columns: 1fr auto;
    grid-template-areas: "title nav";
    gap: var(--spacing-md);
    padding: 0.5rem var(--spacing-md);
  }
  
  .header-actions {
    display: none;
  }
  
  .mobile-menu-toggle,
  .mobile-filter-toggle {
    display: none;
  }
  
  .nav {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-xs);
    padding: 0;
  }
  
  .nav-link {
    padding: 0.375rem var(--spacing-sm);
    white-space: nowrap;
  }
  
  .title {
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .header-content {
    padding: 0.5rem var(--spacing-lg);
  }
  
  .nav-link {
    padding: 0.375rem var(--spacing-md);
    font-size: 0.875rem;
  }
}