/* ═══════════════════════════════════
   HEADER & NAVIGATION
═══════════════════════════════════ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all var(--transition-base);
}

.header.transparent {
  background: transparent;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 24px rgba(10, 92, 145,0.08);
  height: 64px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  z-index: 1;
}

.logo-icon {
  width: 40px;
  height: 40px;
  transition: transform var(--transition-spring);
}

.logo:hover .logo-icon { transform: rotate(-8deg) scale(1.05); }

.logo-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header.transparent .logo-text {
  background: none;
  -webkit-text-fill-color: white;
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.header.transparent .nav-link { color: rgba(255,255,255,0.85); }

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

.nav-link:hover { color: var(--ocean-blue); background: rgba(10, 92, 145,0.06); }
.header.transparent .nav-link:hover { color: white; background: rgba(255,255,255,0.12); }
.nav-link:hover::after, .nav-link.active::after { transform: translateX(-50%) scaleX(1); }
.nav-link.active { color: var(--ocean-blue); font-weight: 600; }

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

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  padding: var(--space-2);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  pointer-events: none;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: all;
}

.nav-dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-dropdown-link:hover {
  background: var(--gradient-card);
  color: var(--ocean-blue);
}

.nav-dropdown-link svg {
  width: 16px;
  height: 16px;
  opacity: 0.6;
}

/* Header CTA */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.btn-donate {
  background: var(--gradient-primary);
  color: white;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(10, 92, 145,0.3);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-donate::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-donate:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(10, 92, 145,0.4);
}
.btn-donate:hover::before { opacity: 1; }

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.menu-toggle:hover { background: rgba(10, 92, 145,0.08); }

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.header.transparent .menu-toggle span { background: white; }

.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: rgba(6, 30, 45,0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-link {
  font-size: 28px;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
  padding: var(--space-2) var(--space-4);
  transition: all var(--transition-fast);
  text-align: center;
}

.mobile-nav-link:hover { color: white; transform: scale(1.05); }

@media (max-width: 1024px) {
  .nav { display: none; }
  .menu-toggle { display: flex; }
  .header-actions .btn-donate { display: none; }
}

@media (max-width: 480px) {
  .header-inner { padding: 0 var(--space-3); }
}