/* === NAV.CSS === */
/* Header, navigation, mega-menu, mobile nav, and footer */

/* ─── Header ─── */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--header-border);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* ─── Logo ─── */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-decoration: none;
}

.logo__icon {
  font-size: var(--text-2xl);
}

.logo__text span {
  color: var(--accent-solar);
}

/* ─── Desktop Nav ─── */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}

.nav__link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav__link--active {
  color: var(--text-primary);
  font-weight: 600;
}

.nav__chevron {
  font-size: var(--text-xs);
  transition: transform var(--transition-fast);
}

.nav__item:hover .nav__chevron {
  transform: rotate(180deg);
}

/* ─── Mega Menu Dropdown ─── */
.mega-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  min-width: 320px;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(8px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  pointer-events: none;
}

.nav__item:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.mega-menu__section-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-1) var(--space-2);
  margin-bottom: var(--space-1);
}

.mega-menu__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
}

.mega-menu__link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.mega-menu__link-icon {
  font-size: var(--text-lg);
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.mega-menu__divider {
  border: none;
  border-top: 1px solid var(--border-primary);
  margin-block: var(--space-3);
}

.mega-menu__footer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background var(--transition-fast);
  text-decoration: none;
}

.mega-menu__footer-link:hover {
  background: var(--bg-hover);
}

.mega-menu__footer-link--solar {
  color: var(--accent-solar);
}

.mega-menu__footer-link--3dprint {
  color: var(--accent-3dprint);
}

/* ─── Header Right (Theme Toggle + Mobile Burger) ─── */
.header__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ─── Theme Toggle Button ─── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  font-size: 1.15rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  cursor: pointer;
  user-select: none;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  border-color: var(--border-secondary);
  transform: scale(1.06);
  box-shadow: var(--shadow-md);
}

.theme-toggle:active {
  transform: scale(0.94);
}

/* 
 * Intuitive icon toggle:
 * When in Light Mode -> Display Moon 🌙 (click to activate Dark Mode)
 * When in Dark Mode -> Display Sun ☀️ (click to activate Light Mode)
 */
:root:not([data-theme="dark"]) .theme-toggle__sun,
[data-theme="light"] .theme-toggle__sun {
  display: none !important;
}

:root:not([data-theme="dark"]) .theme-toggle__moon,
[data-theme="light"] .theme-toggle__moon {
  display: inline-flex !important;
}

[data-theme="dark"] .theme-toggle__moon {
  display: none !important;
}

[data-theme="dark"] .theme-toggle__sun {
  display: inline-flex !important;
}

/* ─── Mobile Hamburger ─── */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.mobile-toggle:hover {
  background: var(--bg-hover);
}

.mobile-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-toggle[aria-expanded="true"] .mobile-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-toggle[aria-expanded="true"] .mobile-toggle__bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ─── Mobile Nav ─── */
@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-1);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    z-index: var(--z-dropdown);
  }

  .nav--open {
    transform: translateX(0);
  }

  .nav__link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }

  .mega-menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    display: none;
    margin-top: var(--space-2);
    min-width: auto;
  }

  .nav__item--open .mega-menu {
    display: block;
  }
}

/* ─── Footer ─── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding-block: var(--space-12);
  margin-top: var(--space-16);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 280px;
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer__link:hover {
  color: var(--text-primary);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-primary);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.footer__cookie-settings {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  transition: color var(--transition-fast);
  background: none;
  border: none;
}

.footer__cookie-settings:hover {
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8) var(--space-6);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}