/* ==========================================================================
   Allybi Header v2.0
   Premium glass header with mega-nav dropdowns and mobile menu.
   ========================================================================== */

/* ---------- Header shell ---------- */
.allybi-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--allybi-z-header);
  background: rgba(250, 250, 248, 0.65);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition:
    background 280ms var(--allybi-ease),
    border-color 280ms var(--allybi-ease),
    box-shadow 280ms var(--allybi-ease);
}

.allybi-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--allybi-border-subtle);
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.04), 0 4px 16px rgba(16, 24, 40, 0.02);
}

/* ---------- Inner container ---------- */
.allybi-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
}

/* ---------- Logo ---------- */
.allybi-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.allybi-logo img {
  height: 36px;
  width: auto;
}

@media (max-width: 1024px) {
  .allybi-logo img {
    height: 32px;
  }
}

/* ---------- Desktop nav ---------- */
.allybi-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link,
.nav-dropdown-trigger {
  font-family: var(--allybi-font);
  font-size: 13px;
  font-weight: 500;
  color: var(--allybi-text-secondary);
  padding: 7px 14px;
  border-radius: var(--allybi-radius-sm);
  border: none;
  background: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition:
    color var(--allybi-duration-hover) var(--allybi-ease),
    background-color var(--allybi-duration-hover) var(--allybi-ease);
  white-space: nowrap;
  letter-spacing: 0.005em;
}

.nav-link:hover,
.nav-dropdown-trigger:hover {
  color: var(--allybi-text-strongest);
  background: rgba(16, 24, 40, 0.04);
}

.nav-link.is-active {
  color: var(--allybi-text-strongest);
  font-weight: 600;
}

/* Dropdown chevron */
.nav-dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cpath d='M2 3.5L5 6.5L8 3.5' stroke='%23454B57' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 200ms var(--allybi-ease);
}

.nav-dropdown.is-open .nav-dropdown-trigger::after {
  transform: rotate(180deg);
}

/* ---------- Dropdown panel ---------- */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 200px;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-radius: var(--allybi-radius-lg);
  border: 1px solid var(--allybi-border-default);
  box-shadow: var(--allybi-shadow-lg);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  z-index: var(--allybi-z-dropdown);
  transition:
    opacity 200ms var(--allybi-ease),
    transform 200ms var(--allybi-ease),
    visibility 200ms;
}

.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--allybi-radius-sm);
  color: var(--allybi-text-secondary);
  text-decoration: none;
  transition:
    color var(--allybi-duration-hover) var(--allybi-ease),
    background-color var(--allybi-duration-hover) var(--allybi-ease);
}

.nav-dropdown-menu a:hover {
  background: var(--allybi-bg-alt-1);
  color: var(--allybi-text-strongest);
}

.nav-dropdown-menu .nav-link-desc {
  font-size: 12px;
  color: var(--allybi-text-muted);
  font-weight: 400;
}

/* ---------- Header CTAs ---------- */
.header-ctas {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-signin {
  font-size: 13px;
  font-weight: 500;
  color: var(--allybi-text-secondary);
  padding: 7px 12px;
  text-decoration: none;
  border-radius: var(--allybi-radius-sm);
  transition:
    color var(--allybi-duration-hover) var(--allybi-ease),
    background var(--allybi-duration-hover) var(--allybi-ease);
}

.header-signin:hover {
  color: var(--allybi-text-strongest);
  background: rgba(16, 24, 40, 0.04);
}

.header-btn {
  height: 36px;
  font-size: 13px;
  padding: 0 18px;
  border-radius: 10px;
}

/* ---------- Mobile toggle ---------- */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: calc(var(--allybi-z-overlay) + 1);
}

.mobile-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--allybi-text-strongest);
  border-radius: 2px;
  transition:
    transform 300ms var(--allybi-ease-out),
    opacity 200ms var(--allybi-ease);
}

.mobile-toggle.is-active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.mobile-toggle.is-active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Mobile menu panel ---------- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100dvh;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: var(--allybi-z-overlay);
  padding: 76px 24px calc(32px + env(safe-area-inset-bottom, 0px));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transform: translateY(-100%);
  transition: transform 350ms var(--allybi-ease-out);
}

.mobile-menu.is-open {
  transform: translateY(0);
}

/* Mobile nav links */
.mobile-nav-link {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--allybi-text-strongest);
  padding: 14px 0;
  border-bottom: 1px solid var(--allybi-border-subtle);
  text-decoration: none;
}

/* Mobile dropdown */
.mobile-dropdown {
  border-bottom: 1px solid var(--allybi-border-subtle);
}

.mobile-dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 17px;
  font-weight: 600;
  color: var(--allybi-text-strongest);
  padding: 14px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--allybi-font);
}

.mobile-dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23454B57' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 200ms var(--allybi-ease);
}

.mobile-dropdown.is-open .mobile-dropdown-trigger::after {
  transform: rotate(180deg);
}

.mobile-dropdown-items {
  display: none;
  padding-left: 16px;
  padding-bottom: 8px;
}

.mobile-dropdown.is-open .mobile-dropdown-items {
  display: block;
}

.mobile-dropdown-items a {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--allybi-text-secondary);
  padding: 10px 0;
  text-decoration: none;
}

.mobile-dropdown-items a:hover {
  color: var(--allybi-text-strongest);
}

/* Mobile CTAs */
.mobile-ctas {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-ctas .allybi-btn {
  width: 100%;
  justify-content: center;
}

.mobile-ctas .header-signin {
  display: block;
  text-align: center;
  font-size: 15px;
  font-weight: 500;
  color: var(--allybi-text-secondary);
  padding: 12px 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .allybi-header-inner {
    height: 56px;
  }

  .desktop-only {
    display: none !important;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}

@media (max-width: 600px) {
  .mobile-menu {
    padding: 68px 20px calc(24px + env(safe-area-inset-bottom, 0px));
  }

  .mobile-nav-link {
    font-size: 16px;
    padding: 13px 0;
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .mobile-ctas .allybi-btn {
    height: 48px;
    font-size: 15px;
  }

  .allybi-header-inner {
    padding: 0 20px;
  }
}

/* ---------- Sticky mobile CTA ---------- */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 20px calc(12px + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--allybi-border-subtle);
  z-index: var(--allybi-z-sticky);
  transform: translateY(100%);
  transition: transform 300ms var(--allybi-ease-out);
}

.sticky-mobile-cta.is-visible {
  transform: translateY(0);
}

.sticky-mobile-cta .allybi-btn {
  width: 100%;
  justify-content: center;
}

@media (max-width: 768px) {
  .sticky-mobile-cta {
    display: block;
  }
}