/* ======================================
   NAVIGATION STYLES
   ====================================== */

/* Announcement Banner */
.announcement-banner {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 0.6rem 1.5rem;
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 500;
  position: relative;
  z-index: calc(var(--z-sticky) + 5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.announcement-banner a {
  color: var(--white);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.announcement-banner .close-banner {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  width: 26px; height: 26px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.announcement-banner .close-banner:hover { background: rgba(255,255,255,0.3); }

/* Main Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255,255,255,0.95);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  gap: 1.5rem;
}

/* Logo */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(33,150,243,0.2));
}

.nav-brand-text strong {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.nav-brand-text span {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Main Navigation */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex: 1;
  justify-content: center;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-dark);
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: var(--primary-50);
}

.nav-link .nav-arrow {
  font-size: 0.65rem;
  transition: transform var(--transition-base);
}

.nav-item:hover .nav-arrow { transform: rotate(180deg); }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-100);
  width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: var(--z-float);
  padding: 0.6rem;
}

.nav-dropdown::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  background: var(--white);
  border-left: 1px solid var(--gray-100);
  border-top: 1px solid var(--gray-100);
  transform: translateX(-50%) rotate(45deg);
}

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

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-dark);
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  background: var(--primary-50);
  color: var(--primary);
  padding-left: 1.1rem;
}

.dropdown-link .dd-icon {
  font-size: 1rem;
  width: 28px; height: 28px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-shrink: 0;
}

.nav-search-btn {
  width: 38px; height: 38px;
  border-radius: var(--radius-md);
  background: var(--gray-50);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid var(--gray-100);
}

.nav-search-btn:hover {
  background: var(--primary-50);
  color: var(--primary);
  border-color: var(--primary-lighter);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px; height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--gray-50);
  cursor: pointer;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-fast);
}

.nav-toggle:hover { background: var(--primary-50); border-color: var(--primary-lighter); }

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all var(--transition-base);
}

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

/* ======================================
   MOBILE NAV
   ====================================== */

@media (max-width: 1024px) {
  .nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: min(340px, 90vw);
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 5rem 1.5rem 2rem;
    gap: 0.2rem;
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-slow);
    z-index: var(--z-overlay);
    overflow-y: auto;
  }

  .nav-menu.open { right: 0; }

  .nav-toggle { display: flex; }

  .nav-item { width: 100%; }

  .nav-link {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: var(--text-base);
  }

  .nav-dropdown {
    position: static;
    transform: none;
    width: 100%;
    box-shadow: none;
    border: none;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    opacity: 1;
    visibility: visible;
    display: none;
  }

  .nav-dropdown.open { display: block; }
  .nav-dropdown::before { display: none; }

  .nav-actions .btn { display: none; }

  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(26,44,61,0.4);
    z-index: calc(var(--z-overlay) - 1);
    display: none;
    backdrop-filter: blur(4px);
  }

  .nav-overlay.show { display: block; }
}

@media (max-width: 480px) {
  .nav-wrapper { padding: 0.75rem 1rem; }
  .nav-brand-text { display: none; }
}