/**
 * SunFlex Mega Menu v3.0
 * Minimalist B2B Style - Centered Dropdown
 * 
 * Features:
 * - Centered mega menu (not right-overflow)
 * - Click activation on desktop
 * - Accordion mobile navigation
 * - Language switcher integration
 * - Accessible (ARIA, keyboard nav)
 */

/* ==========================================================================
   CSS VARIABLES
   ========================================================================== */
:root {
  /* Colors */
  --sf-menu-bg: #ffffff;
  --sf-menu-text: #1C2329;
  --sf-menu-text-muted: #5A5F64;
  --sf-menu-accent: #01CD74;
  --sf-menu-accent-light: #E8F9F0;
  --sf-menu-border: #E8E9EA;
  --sf-menu-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  
  /* Typography */
  --sf-menu-font: 'Open Sans', -apple-system, sans-serif;
  --sf-menu-font-heading: 'Montserrat', sans-serif;
  
  /* Spacing */
  --sf-menu-gap: 24px;
  --sf-menu-padding: 32px;
  
  /* Timing */
  --sf-menu-transition: 0.2s ease;
  --sf-menu-delay-open: 0ms;
  --sf-menu-delay-close: 300ms;
  
  /* Layout */
  --sf-header-height: 72px;
  --sf-container-width: 1200px;
}

/* ==========================================================================
   HEADER BASE
   ========================================================================== */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--sf-menu-bg);
  border-bottom: 1px solid var(--sf-menu-border);
}

.sf-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--sf-header-height);
  max-width: var(--sf-container-width);
  margin: 0 auto;
  padding: 0 20px;
  gap: 16px;
}

/* Logo */
.sf-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.sf-logo img {
  height: 40px;
  width: auto;
}

.sf-logo-text {
  font-family: var(--sf-menu-font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--sf-menu-text);
}

/* ==========================================================================
   MAIN NAVIGATION
   ========================================================================== */
.sf-nav {
  display: flex;
  align-items: center;
  height: 100%;
  flex: 1;
  justify-content: center;
}

.sf-nav-list {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
  flex-wrap: nowrap;
}

.sf-nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* Nav Links */
.sf-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  font-family: var(--sf-menu-font);
  font-size: 15px;
  font-weight: 600;
  color: var(--sf-menu-text);
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--sf-menu-transition);
  cursor: pointer;
  background: none;
  border: none;
  white-space: nowrap !important;
  flex-shrink: 0;
}

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

.sf-nav-link[aria-expanded="true"] {
  color: var(--sf-menu-accent);
  background: var(--sf-menu-accent-light);
}

/* Dropdown Arrow */
.sf-nav-arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--sf-menu-transition);
}

.sf-nav-link[aria-expanded="true"] .sf-nav-arrow {
  transform: rotate(180deg);
}

/* ==========================================================================
   MEGA MENU PANEL
   ========================================================================== */
.sf-mega-panel {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 600px;
  max-width: 900px;
  background: var(--sf-menu-bg);
  border: 1px solid var(--sf-menu-border);
  border-radius: 12px;
  box-shadow: var(--sf-menu-shadow);
  padding: var(--sf-menu-padding);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--sf-menu-transition), visibility var(--sf-menu-transition);
  margin-top: 8px;
}

/* Arrow pointer */
.sf-mega-panel::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 10px solid transparent;
  border-bottom-color: var(--sf-menu-border);
}

.sf-mega-panel::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 9px solid transparent;
  border-bottom-color: var(--sf-menu-bg);
  margin-bottom: -1px;
}

/* Active state */
.sf-nav-item.is-open .sf-mega-panel {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   MEGA MENU GRID LAYOUT
   ========================================================================== */
.sf-mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sf-menu-gap);
}

/* For 4 columns */
.sf-mega-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* For 2 columns */
.sf-mega-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

/* Column */
.sf-mega-column {
  min-width: 0;
}

/* Column Header */
.sf-mega-heading {
  display: block;
  font-family: var(--sf-menu-font-heading);
  font-size: 12px;
  font-weight: 700;
  color: var(--sf-menu-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--sf-menu-accent-light);
}

/* Column Links */
.sf-mega-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sf-mega-link {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--sf-menu-text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--sf-menu-transition);
  margin-bottom: 2px;
}

.sf-mega-link:hover,
.sf-mega-link:focus {
  color: var(--sf-menu-text);
  background: var(--sf-menu-accent-light);
  padding-left: 16px;
}

/* View All Link */
.sf-mega-view-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 8px 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--sf-menu-accent);
  text-decoration: none;
  transition: gap var(--sf-menu-transition);
}

.sf-mega-view-all:hover {
  gap: 10px;
}

.sf-mega-view-all svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   SIMPLE DROPDOWN (for items without mega menu)
   ========================================================================== */
.sf-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--sf-menu-bg);
  border: 1px solid var(--sf-menu-border);
  border-radius: 10px;
  box-shadow: var(--sf-menu-shadow);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--sf-menu-transition), visibility var(--sf-menu-transition);
  margin-top: 8px;
}

.sf-nav-item.is-open .sf-dropdown {
  opacity: 1;
  visibility: visible;
}

.sf-dropdown-link {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--sf-menu-text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--sf-menu-transition);
}

.sf-dropdown-link:hover,
.sf-dropdown-link:focus {
  color: var(--sf-menu-text);
  background: var(--sf-menu-accent-light);
}

/* ==========================================================================
   HEADER ACTIONS (Language, CTA)
   ========================================================================== */
.sf-header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Language Switcher */
.sf-lang {
  position: relative;
}

.sf-lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  font-family: var(--sf-menu-font);
  font-size: 14px;
  font-weight: 600;
  color: var(--sf-menu-text);
  background: transparent;
  border: 1px solid var(--sf-menu-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--sf-menu-transition);
}

.sf-lang-toggle:hover {
  border-color: var(--sf-menu-accent);
  background: var(--sf-menu-accent-light);
}

.sf-lang-toggle svg {
  width: 14px;
  height: 14px;
  transition: transform var(--sf-menu-transition);
}

.sf-lang.is-open .sf-lang-toggle svg {
  transform: rotate(180deg);
}

/* Language Dropdown */
.sf-lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 140px;
  background: var(--sf-menu-bg);
  border: 1px solid var(--sf-menu-border);
  border-radius: 8px;
  box-shadow: var(--sf-menu-shadow);
  padding: 6px;
  margin-top: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--sf-menu-transition), visibility var(--sf-menu-transition);
}

.sf-lang.is-open .sf-lang-dropdown {
  opacity: 1;
  visibility: visible;
}

.sf-lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--sf-menu-text-muted);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: all var(--sf-menu-transition);
}

.sf-lang-option:hover {
  background: var(--sf-menu-accent-light);
  color: var(--sf-menu-text);
}

.sf-lang-option.is-active {
  background: var(--sf-menu-accent-light);
  color: var(--sf-menu-accent);
  font-weight: 600;
}

.sf-lang-flag {
  font-size: 18px;
}

/* CTA Button */
.sf-header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--sf-menu-font-heading);
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--sf-menu-accent) 0%, #70DE85 100%);
  border: none;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--sf-menu-transition);
  box-shadow: 0 4px 12px rgba(1, 205, 116, 0.3);
}

.sf-header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(1, 205, 116, 0.4);
}

/* ==========================================================================
   MOBILE MENU TOGGLE
   ========================================================================== */
.sf-mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: 8px;
  transition: background var(--sf-menu-transition);
}

.sf-mobile-toggle:hover {
  background: var(--sf-menu-accent-light);
}

.sf-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--sf-menu-text);
  border-radius: 2px;
  transition: all var(--sf-menu-transition);
}

.sf-mobile-toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.sf-mobile-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.sf-mobile-toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================================================
   MOBILE MENU
   ========================================================================== */
.sf-mobile-menu {
  position: fixed;
  top: var(--sf-header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--sf-menu-bg);
  z-index: 1001;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  -webkit-overflow-scrolling: touch;
}

.sf-mobile-menu.is-open {
  transform: translateX(0);
  visibility: visible;
}

/* Mobile Nav */
.sf-mobile-nav {
  list-style: none;
  margin: 0;
  padding: 16px;
}

.sf-mobile-item {
  border-bottom: 1px solid var(--sf-menu-border);
}

.sf-mobile-item:last-child {
  border-bottom: none;
}

/* Mobile Link */
.sf-mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 0;
  font-family: var(--sf-menu-font);
  font-size: 16px;
  font-weight: 600;
  color: var(--sf-menu-text);
  background: none;
  border: none;
  text-decoration: none;
  cursor: pointer;
  text-align: left;
}

.sf-mobile-link svg {
  width: 20px;
  height: 20px;
  color: var(--sf-menu-text-muted);
  transition: transform var(--sf-menu-transition);
}

.sf-mobile-item.is-open > .sf-mobile-link {
  color: var(--sf-menu-accent);
}

.sf-mobile-item.is-open > .sf-mobile-link svg {
  transform: rotate(180deg);
  color: var(--sf-menu-accent);
}

/* Mobile Accordion */
.sf-mobile-accordion {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, opacity 0.2s ease;
  opacity: 0;
}

.sf-mobile-item.is-open > .sf-mobile-accordion {
  max-height: 2000px;
  opacity: 1;
}

.sf-mobile-submenu {
  list-style: none;
  margin: 0;
  padding: 0 0 16px 0;
}

/* Submenu Category */
.sf-mobile-category {
  font-family: var(--sf-menu-font-heading);
  font-size: 11px;
  font-weight: 700;
  color: var(--sf-menu-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 16px 8px;
  margin-top: 8px;
  border-top: 1px solid var(--sf-menu-border);
}

.sf-mobile-category:first-child {
  margin-top: 0;
  border-top: none;
}

/* Submenu Link */
.sf-mobile-sublink {
  display: block;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--sf-menu-text-muted);
  text-decoration: none;
  transition: all var(--sf-menu-transition);
}

.sf-mobile-sublink:hover,
.sf-mobile-sublink:focus {
  color: var(--sf-menu-accent);
  background: var(--sf-menu-accent-light);
}

/* Mobile Language Switcher */
.sf-mobile-lang {
  display: flex;
  gap: 8px;
  padding: 16px;
  border-top: 1px solid var(--sf-menu-border);
  margin-top: 16px;
}

.sf-mobile-lang-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--sf-menu-text-muted);
  background: transparent;
  border: 2px solid var(--sf-menu-border);
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--sf-menu-transition);
}

.sf-mobile-lang-btn:hover {
  border-color: var(--sf-menu-accent);
}

.sf-mobile-lang-btn.is-active {
  color: var(--sf-menu-accent);
  background: var(--sf-menu-accent-light);
  border-color: var(--sf-menu-accent);
}

.sf-mobile-lang-btn span {
  font-size: 18px;
}

/* Mobile CTA */
.sf-mobile-cta {
  display: block;
  margin: 16px;
  padding: 16px;
  font-family: var(--sf-menu-font-heading);
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--sf-menu-accent) 0%, #70DE85 100%);
  border: none;
  border-radius: 10px;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 4px 12px rgba(1, 205, 116, 0.3);
}

/* ==========================================================================
   OVERLAY
   ========================================================================== */
.sf-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sf-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
  .sf-nav,
  .sf-header-cta,
  .sf-lang {
    display: none !important;
  }
  
  .sf-mobile-toggle {
    display: flex !important;
  }
  
  .sf-header-inner {
    padding: 0 16px;
  }
  
  .sf-header {
    z-index: 1002;
  }
}

@media (min-width: 1025px) {
  .sf-mobile-menu,
  .sf-mobile-toggle {
    display: none !important;
  }
}

/* Large screens - wider mega menu */
@media (min-width: 1400px) {
  .sf-mega-panel {
    max-width: 1000px;
  }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */
.sf-nav-link:focus,
.sf-mega-link:focus,
.sf-dropdown-link:focus,
.sf-lang-toggle:focus,
.sf-lang-option:focus,
.sf-mobile-link:focus,
.sf-mobile-sublink:focus {
  outline: 2px solid var(--sf-menu-accent);
  outline-offset: 2px;
}

/* Skip to content */
.sf-skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 12px 24px;
  background: var(--sf-menu-accent);
  color: #fff;
  font-weight: 600;
  border-radius: 8px;
  z-index: 9999;
  transition: top 0.2s;
}

.sf-skip-link:focus {
  top: 16px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}