/* ==========================================================================
   CRAB — Site Navigation & Header
   Sticky header with blur, animated underlines, prominent Donate CTA,
   light/dark scene adaptation, and responsive mobile drawer.
   ========================================================================== */

:root {
  --nav-crimson: #c1121f;
  --nav-deep-red: #780000;
  --nav-cream: #fdf0d5;
  --nav-navy: #003049;
  --nav-blue: #669bbc;
  --nav-white: #ffffff;
  --header-height: 92px;
  --header-height-scrolled: 74px;
}

/* --------------------------------------------------------------------------
   1. Masthead Base & Sticky Behavior
   -------------------------------------------------------------------------- */
.masthead.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  width: 100%;
  padding: 0 clamp(20px, 5vw, 80px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(253, 240, 213, 0.12);
  color: var(--nav-cream);
  background: transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: height 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              background 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              backdrop-filter 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              -webkit-backdrop-filter 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              color 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  box-sizing: border-box;
}

.masthead.site-header > * {
  pointer-events: auto;
}

.masthead-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Scrolled state: Subtle background transition and glassmorphism blur */
.masthead.site-header.is-scrolled {
  height: var(--header-height-scrolled);
  background: rgba(0, 30, 48, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(253, 240, 213, 0.14);
  box-shadow: 0 10px 30px rgba(0, 20, 35, 0.35);
}

/* --------------------------------------------------------------------------
   2. Light / Dark Scene Adaptation (Maintains Readability Everywhere)
   -------------------------------------------------------------------------- */
.masthead.site-header.is-light {
  color: var(--nav-navy);
  border-bottom-color: rgba(0, 48, 73, 0.12);
}

.masthead.site-header.is-light .brand img {
  filter: none;
}

.masthead.site-header.is-light .brandword {
  color: var(--nav-navy);
}

.masthead.site-header.is-light .brandcaption {
  color: var(--nav-navy);
  opacity: 0.85;
}

.masthead.site-header.is-light.is-scrolled {
  background: rgba(253, 240, 213, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: rgba(0, 48, 73, 0.16);
  box-shadow: 0 10px 30px rgba(0, 48, 73, 0.1);
}

/* --------------------------------------------------------------------------
   3. Brand Logo (Left Side)
   -------------------------------------------------------------------------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.brand:hover {
  opacity: 0.92;
  transform: scale(1.01);
}

.brand img {
  height: 44px;
  width: 44px;
  object-fit: contain;
  display: block;
  filter: brightness(1.2);
  transition: filter 0.3s ease, transform 0.3s ease;
}

.brand:hover img {
  transform: rotate(-3deg) scale(1.05);
}

.brandwords {
  display: flex;
  flex-direction: column;
  line-height: 0.9;
}

.brandword {
  font-family: Impact, "Arial Narrow", -apple-system, sans-serif;
  font-weight: 900;
  font-size: 28px;
  letter-spacing: -0.5px;
  color: inherit;
  text-transform: uppercase;
}

.brandcaption {
  font-size: 8.5px;
  letter-spacing: 0.18em;
  font-weight: 800;
  margin-top: 3px;
  color: inherit;
  opacity: 0.88;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   4. Desktop Navigation (Right Side)
   -------------------------------------------------------------------------- */
.desktop-nav {
  display: flex;
  align-items: center;
}

.mastnav-list {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.4vw, 36px);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

/* Normal Nav Links with Animated Underline */
.mastnav-link:not(.mastnav-link--donate) {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 2px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: inherit;
  text-decoration: none;
  opacity: 0.88;
  transition: color 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
}

/* Animated Underline Expansion */
.mastnav-link:not(.mastnav-link--donate)::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mastnav-link:not(.mastnav-link--donate):hover {
  opacity: 1;
  transform: translateY(-1px);
}

.mastnav-link:not(.mastnav-link--donate):hover::after {
  width: 100%;
}

/* Subtle Active Page Indicator */
.mastnav-link:not(.mastnav-link--donate).is-active {
  opacity: 1;
  font-weight: 800;
}

.mastnav-link:not(.mastnav-link--donate).is-active::after {
  width: 100%;
  background-color: var(--nav-crimson);
}

.masthead.site-header.is-light .mastnav-link:not(.mastnav-link--donate).is-active::after {
  background-color: var(--nav-crimson);
}

/* --------------------------------------------------------------------------
   5. Prominent Crimson Donate CTA Button (#C1121F)
   -------------------------------------------------------------------------- */
.mastnav-link--donate {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 9999px;
  background: var(--nav-crimson);
  color: #ffffff !important;
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 16px rgba(193, 18, 31, 0.4), 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.mastnav-cta-icon {
  display: inline-block;
  font-size: 13px;
  transition: transform 0.25s ease;
}

.mastnav-link--donate:hover {
  background: #d91422;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 24px rgba(193, 18, 31, 0.55), 0 2px 6px rgba(0, 0, 0, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
}

.mastnav-link--donate:hover .mastnav-cta-icon {
  transform: translate(2px, -2px);
}

.mastnav-link--donate:active {
  transform: translateY(0) scale(0.98);
}

.mastnav-link--donate.is-active {
  background: #9b0e19;
  outline: 2px solid var(--nav-cream);
  outline-offset: 2px;
}

.masthead.site-header.is-light .mastnav-link--donate {
  box-shadow: 0 4px 16px rgba(193, 18, 31, 0.3);
}

.masthead.site-header.is-light .mastnav-link--donate.is-active {
  outline-color: var(--nav-navy);
}

/* --------------------------------------------------------------------------
   6. Mobile Navigation Hamburger Button
   -------------------------------------------------------------------------- */
.mastnav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(253, 240, 213, 0.25);
  border-radius: 8px;
  cursor: pointer;
  padding: 0;
  color: inherit;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.mastnav-toggle:hover {
  background: rgba(253, 240, 213, 0.08);
  border-color: rgba(253, 240, 213, 0.45);
}

.masthead.site-header.is-light .mastnav-toggle {
  border-color: rgba(0, 48, 73, 0.25);
}

.masthead.site-header.is-light .mastnav-toggle:hover {
  background: rgba(0, 48, 73, 0.06);
}

.toggle-box {
  position: relative;
  width: 22px;
  height: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  transform-origin: center;
}

/* Morph to '✕' when menu is open */
.mastnav-toggle.is-active .bar-1 {
  transform: translateY(7px) rotate(45deg);
}

.mastnav-toggle.is-active .bar-2 {
  opacity: 0;
  transform: scaleX(0);
}

.mastnav-toggle.is-active .bar-3 {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   7. Mobile Navigation Drawer & Backdrop Overlay
   -------------------------------------------------------------------------- */
.crab-mobile-nav {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  z-index: 999998;
  pointer-events: none;
  visibility: hidden;
  transition: visibility 0.35s ease;
}

.crab-mobile-nav.is-open {
  pointer-events: auto;
  visibility: visible;
}

.crab-mobile-backdrop {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(0, 15, 25, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 0.35s ease;
  z-index: 999998;
}

.crab-mobile-nav.is-open .crab-mobile-backdrop {
  opacity: 1;
}

.crab-mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 100vw);
  height: 100vh;
  height: 100dvh;
  max-height: 100dvh;
  background: linear-gradient(175deg, #002236 0%, #001522 100%);
  border-left: 1px solid rgba(253, 240, 213, 0.15);
  box-shadow: -12px 0 40px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  padding: 24px 22px 30px;
  transform: translateX(100%);
  transition: transform 0.38s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-sizing: border-box;
  z-index: 999999;
}

.crab-mobile-nav.is-open .crab-mobile-drawer {
  transform: translateX(0);
}

.crab-mobile-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(253, 240, 213, 0.12);
  margin-bottom: 28px;
}

.crab-mobile-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--nav-cream);
}

.crab-mobile-close {
  background: rgba(253, 240, 213, 0.08);
  border: 1px solid rgba(253, 240, 213, 0.2);
  color: var(--nav-cream);
  font-size: 16px;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.crab-mobile-close:hover {
  background: var(--nav-crimson);
  color: #fff;
  transform: rotate(90deg);
}

.crab-mobile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.crab-mobile-item {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  transition-delay: calc(var(--item-index, 0) * 0.06s + 0.1s);
}

.crab-mobile-nav.is-open .crab-mobile-item {
  opacity: 1;
  transform: translateX(0);
}

.crab-mobile-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--nav-cream);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(253, 240, 213, 0.04);
  border: 1px solid transparent;
  transition: all 0.25s ease;
}

.crab-mobile-num {
  font-size: 11px;
  color: var(--nav-blue);
  font-weight: 800;
}

.crab-mobile-label {
  flex: 1;
}

.crab-mobile-arrow {
  color: var(--nav-cream);
  opacity: 0.5;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.crab-mobile-link:hover {
  background: rgba(253, 240, 213, 0.1);
  border-color: rgba(253, 240, 213, 0.2);
  color: #ffffff;
  transform: translateX(4px);
}

.crab-mobile-link:hover .crab-mobile-arrow {
  opacity: 1;
  transform: translateX(4px);
}

.crab-mobile-link.is-active {
  background: rgba(102, 155, 188, 0.2);
  border-color: var(--nav-blue);
  color: #ffffff;
}

/* Donate in Mobile Menu */
.crab-mobile-link--donate {
  background: var(--nav-crimson);
  color: #ffffff !important;
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 14px rgba(193, 18, 31, 0.45);
  margin-top: 6px;
}

.crab-mobile-link--donate:hover {
  background: #d91422;
  box-shadow: 0 6px 20px rgba(193, 18, 31, 0.6);
  transform: translateX(4px) scale(1.02);
}

.crab-mobile-link--donate .crab-mobile-num {
  color: #ffcccc;
}

.crab-mobile-cta-badge {
  font-size: 12px;
  font-weight: 800;
  background: rgba(0, 0, 0, 0.25);
  padding: 4px 10px;
  border-radius: 999px;
}

.crab-mobile-footer {
  margin-top: auto;
  padding-top: 28px;
  border-top: 1px solid rgba(253, 240, 213, 0.12);
}

.crab-mobile-movement-kicker {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--nav-blue);
  font-weight: 800;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.crab-mobile-footer-text {
  font-size: 12px;
  line-height: 1.5;
  color: #b0cddb;
  margin: 0 0 16px;
}

.crab-mobile-insta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  border-radius: 6px;
  background: rgba(253, 240, 213, 0.08);
  color: var(--nav-cream);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background 0.2s ease;
  box-sizing: border-box;
}

.crab-mobile-insta-btn:hover {
  background: rgba(253, 240, 213, 0.16);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   8. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (min-width: 1025px) {
  .desktop-nav {
    display: block !important;
  }
  .mastnav-toggle {
    display: none !important;
  }
  .crab-mobile-nav {
    display: none !important;
  }
}

@media (max-width: 1024px) {
  :root {
    --header-height: 76px;
    --header-height-scrolled: 68px;
  }

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

  .mastnav-toggle {
    display: flex !important;
    flex-shrink: 0 !important;
  }

  .masthead.site-header {
    padding: 0 clamp(16px, 4vw, 32px) !important;
  }

  .masthead-inner {
    width: 100% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 12px !important;
  }

  .brand {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    min-width: 0 !important;
    flex-shrink: 1 !important;
  }

  .brand img {
    height: 38px !important;
    width: 38px !important;
    flex-shrink: 0 !important;
  }

  .brandword {
    font-size: 24px !important;
  }

  .brandcaption {
    font-size: 7.5px !important;
  }
}

@media (max-width: 640px) {
  .masthead.site-header {
    padding: 0 16px !important;
  }

  .brandcaption {
    display: none !important;
  }

  .brand img {
    height: 34px !important;
    width: 34px !important;
  }

  .brandword {
    font-size: 22px !important;
  }

  .mastnav-toggle {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    min-height: 44px !important;
  }
}