/**
 * ELIO SOLAR - HEADER NAVIGATION STYLES
 * Navigation menu component styles
 * Version: 2.0
 */

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */

:root {
  /* Navigation spacing */
  --nav-item-spacing: 40px;
  --nav-link-padding-y: 10px;
  --nav-link-padding-x: 16px;

  /* Navigation colors - default state */
  --nav-link-opacity: 0.85;
  --nav-link-opacity-hover: 1;
  --nav-link-opacity-active: 1;

  /* Navigation underline */
  --nav-underline-height: 3px;
  --nav-underline-offset: -2px;
  --nav-underline-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);

  /* Typography */
  --nav-font-size: 15px;
  --nav-font-size-scrolled: 15px;
  --nav-font-weight: 500;
  --nav-font-weight-active: 600;
  --nav-letter-spacing: 0.01em;

  /* Transitions */
  --nav-transition: all 0.2s ease;
  --nav-underline-transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   NAVIGATION CONTAINER
   ============================================ */

.header-nav {
  flex: 1;
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--nav-item-spacing);
  margin: 0;
  padding: 0;
  list-style: none;
  height: 100%;
}

/* ============================================
   NAVIGATION ITEMS
   ============================================ */

.nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-link,
.nav-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--nav-link-padding-y) var(--nav-link-padding-x);
  font-size: var(--nav-font-size);
  font-weight: var(--nav-font-weight);
  letter-spacing: var(--nav-letter-spacing);
  color: inherit;
  text-decoration: none;
  opacity: var(--nav-link-opacity);
  transition: var(--nav-transition);
  cursor: pointer;
  background: transparent;
  border: none;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}

/* Font size when scrolled */
.site-header[data-header-scrolled="true"] .nav-link,
.site-header[data-header-scrolled="true"] .nav-trigger {
  font-size: var(--nav-font-size-scrolled);
}

/* ============================================
   NAVIGATION LINK STATES
   ============================================ */

/* Hover state */
.nav-link:hover,
.nav-trigger:hover {
  opacity: var(--nav-link-opacity-hover);
  background: rgba(255, 255, 255, 0.1);
}

/* When scrolled, different hover background */
.site-header[data-header-scrolled="true"] .nav-link:hover,
.site-header[data-header-scrolled="true"] .nav-trigger:hover {
  background: rgba(59, 130, 246, 0.08);
}

/* Active page state */
.nav-link[data-active="true"] {
  opacity: var(--nav-link-opacity-active);
  font-weight: var(--nav-font-weight-active);
}

/* Focus state (keyboard navigation) */
.nav-link:focus,
.nav-trigger:focus {
  outline: 2px solid currentColor;
  outline-offset: 4px;
  border-radius: 4px;
  opacity: 1;
}

/* ============================================
   NAVIGATION UNDERLINE EFFECT
   ============================================ */

.nav-link::after,
.nav-trigger::after {
  content: '';
  position: absolute;
  bottom: var(--nav-underline-offset);
  left: var(--nav-link-padding-x);
  right: var(--nav-link-padding-x);
  height: var(--nav-underline-height);
  background: var(--nav-underline-gradient);
  transform: scaleX(0);
  transform-origin: center;
  transition: var(--nav-underline-transition);
  border-radius: 3px;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.4);
}

/* Underline on hover */
.nav-link:hover::after,
.nav-trigger:hover::after {
  transform: scaleX(1);
}

/* Underline always visible for active page */
.nav-link[data-active="true"]::after {
  transform: scaleX(1);
}

/* ============================================
   DROPDOWN TRIGGER ICON
   ============================================ */

.nav-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
  fill: currentColor;
}

/* Rotate icon when mega menu is open */
.nav-trigger[aria-expanded="true"] .nav-icon {
  transform: rotate(180deg);
}

/* ============================================
   COLOR ADJUSTMENTS FOR SCROLLED STATE
   ============================================ */

/* When scrolled, links are dark */
.site-header[data-header-scrolled="true"] .nav-link,
.site-header[data-header-scrolled="true"] .nav-trigger {
  color: var(--header-text-scrolled);
}

/* Hover state when scrolled */
.site-header[data-header-scrolled="true"] .nav-link:hover,
.site-header[data-header-scrolled="true"] .nav-trigger:hover {
  color: #1e3a8a;
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */

@media (max-width: 1200px) {
  :root {
    --nav-item-spacing: 28px;
    --nav-font-size: 14px;
    --nav-link-padding-x: 12px;
  }
}

/* ============================================
   RESPONSIVE - MOBILE
   ============================================ */

@media (max-width: 1023px) {
  /* Hide desktop navigation on mobile */
  .header-nav {
    display: none;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .header-nav {
    display: none;
  }
}

/* ============================================
   REDUCED MOTION SUPPORT
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  .nav-link,
  .nav-trigger,
  .nav-icon,
  .nav-link::after,
  .nav-trigger::after {
    transition: none !important;
    animation: none !important;
  }

  .nav-link::after,
  .nav-trigger::after {
    transform: scaleX(0);
  }

  .nav-link:hover::after,
  .nav-trigger:hover::after,
  .nav-link[data-active="true"]::after {
    transform: scaleX(1);
  }
}