/* =========================================
   HEADER — site-header, site-nav, nav-toggle
   Depends on: common.css (design tokens)
   ========================================= */

.site-header {
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-white);
}

.site-logo-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-purple-vibrant) 0%, var(--color-mint) 100%);
  color: var(--color-white);
}

.site-logo-word {
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
}

.site-logo-word span {
  color: var(--color-purple-vibrant);
}

.site-logo-image {
  display: block;
  width: auto;
  height: 52px;
  max-height: 52px;
  object-fit: contain;
}
/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-item {
  display: flex;
  align-items: center;
}

.site-nav .nav-link {
  color: rgba(255, 255, 255, 0.7);
  font-size: 16px;
  font-weight: 500;
  padding: 0;
  border-radius: 0;
  background: transparent;
  transition: color 0.2s;
  text-decoration: none;
}

.site-nav .nav-link:hover,
.site-nav .nav-link.active {
  background: transparent;
  color: var(--color-white);
}

.site-nav a.nav-cta {
  margin-left: 1rem;
  color: var(--color-white);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: linear-gradient(169deg, var(--color-purple-vibrant) 0%, var(--color-purple) 100%);
  transition: background 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

.site-nav a.nav-cta:hover {
  background: linear-gradient(169deg, #6747ff 0%, #5a37ed 100%);
  color: var(--color-white);
}

/* --- MEGA MENU BASE SYSTEM --- */
.mega-menu-container {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  width: 100%;
  background: rgba(9, 9, 9, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1), transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.25s;
  z-index: 99;
}

.site-nav-list > li:hover .mega-menu-container {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu-inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
}

/* Sidebar Tab list */
.mega-menu-tabs {
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  padding-right: 1.5rem;
}

.mega-menu-tab-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.mega-menu-tab-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  outline: none;
  color: rgba(255, 255, 255, 0.55);
  font-family: var(--font-brand);
  font-size: 17px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.25s ease;
  position: relative;
}

.mega-menu-tab-btn:hover {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.9);
}

.mega-menu-tab-btn.active {
  background: rgba(79, 46, 222, 0.12);
  color: var(--color-purple-vibrant);
}

.mega-menu-tab-btn.active::after {
  content: '';
  position: absolute;
  left: 0;
  top: 15%;
  height: 70%;
  width: 3px;
  background: var(--color-purple-vibrant);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.mega-menu-tab-btn svg.chevron {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  transition: transform 0.2s;
  transform: translateX(4px);
}

.mega-menu-tab-btn.active svg.chevron {
  transform: translateX(6px);
  opacity: 1;
}

/* Panels Area */
.mega-menu-panels {
  min-height: 220px;
  position: relative;
}

.mega-menu-panel {
  display: none;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  height: 100%;
}

.mega-menu-panel.active {
  display: grid;
  animation: megaMenuFadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes megaMenuFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Description block */
.mega-menu-description {
  padding-right: 1.5rem;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}
.mega-menu-desc-title {
  font-size: 15px;
  color: var(--color-purple-vibrant);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}
.mega-menu-description p {
  font-size: 15.5px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
}

/* Columns for links */
.mega-menu-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2.5rem;
}

.mega-menu-column-title {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-purple-vibrant);
  margin-bottom: 1.25rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 0.5rem;
}

.mega-menu-column-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mega-menu-column-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 16px;
  font-weight: 500;
  transition: all 0.2s ease;
  display: inline-block;
}

.mega-menu-column-links a:hover {
  color: #fff !important;
  transform: translateX(4px);
}

/* Image preview section */
.mega-menu-image-container {
  width: 280px;
  height: 180px;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-soft);
  align-self: center;
  background: rgba(255, 255, 255, 0.02);
}

.mega-menu-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.mega-menu-image-container:hover .mega-menu-image {
  transform: scale(1.06);
}

.mega-menu-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0.1) 100%);
  padding: 1rem;
  display: flex;
  align-items: flex-end;
}

.mega-menu-image-badge {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--color-purple);
  color: var(--color-white);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.mega-menu-mobile-tab-title {
  display: none;
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  background: transparent;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: 0.3s;
}

/* Mobile breakpoint — matches megamenu.css */
@media (max-width: 1080px) {
  .nav-toggle { display: flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #090909;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-direction: column;
    padding: 1.5rem 1.25rem 2rem 1.25rem;
    gap: 0.25rem;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .site-nav.open { display: flex; }

  .site-nav .nav-link {
    width: 100%;
    padding: 0.75rem 0;
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .site-nav a.nav-cta {
    margin-left: 0;
    margin-top: 0.5rem;
    text-align: center;
    justify-content: center;
  }

  .site-logo-image {
    height: 42px;
    max-height: 42px;
  }

  /* Collapsible mobile mega menu rendering */
  .mega-menu-container {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: rgba(255, 255, 255, 0.01);
    border: none;
    padding: 0 0.5rem 1.25rem 0.5rem;
    width: 100%;
    transition: none;
  }

  .site-nav-list > li.open .mega-menu-container {
    display: block;
  }

  .site-nav-list > li:hover .mega-menu-container {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .mega-menu-inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  .mega-menu-tabs {
    display: none; /* Tabs list hidden on mobile */
  }

  .mega-menu-description {
    padding-right: 0;
    border-right: none;
    margin-bottom: 0.5rem;
  }

  .mega-menu-panels {
    min-height: auto;
  }

  .mega-menu-panel {
    display: flex !important; /* Stack all panels on mobile */
    flex-direction: column;
    gap: 1.5rem;
  }

  .mega-menu-mobile-tab-title {
    display: block;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--color-mint);
    margin-top: 0.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .mega-menu-columns {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .mega-menu-column-title {
    margin-bottom: 0.75rem;
    font-size: 11.5px;
  }

  .mega-menu-column-links {
    gap: 0.65rem;
    padding-left: 0.5rem;
  }

  .mega-menu-column-links a {
    font-size: 14px;
  }

  .mega-menu-image-container {
    display: none; /* Hide images on mobile to conserve space */
  }
}

/* ── Environment banner (shown for non-main branches) ───── */
.env-banner {
  position: sticky;
  top: 0;
  z-index: 200;
  background: #dc2626;
  color: #fff;
  text-align: center;
  padding: 5px 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.4;
}

.has-env-banner .site-header {
  top: 30px;
}