/* Premium Header Styles */
#masthead {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition-normal);
}

#masthead .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px; /* fixed height for alignment */
}

.logo {
  display: flex;
  align-items: center;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.02);
}

.logo img {
  height: 50px;
  width: auto;
  object-fit: contain;
}

.nav-primary {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--fs-sm);
  color: var(--color-text-dark);
  padding: 6px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile Toggle Hamburger Button */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
  color: var(--color-text-dark);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* Responsive Rules for Header */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-primary {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--color-surface);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-6);
    gap: var(--space-5);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    z-index: 999;
  }

  .nav-open .nav-primary {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    font-size: var(--fs-h3);
    width: 100%;
    text-align: center;
  }

  .nav-link::after {
    display: none;
  }
}

/* Swachh Bharat Logo Responsiveness */
@media (max-width: 768px) {
  .header-swachh-container {
    display: none !important;
  }
}

@media (max-width: 576px) {
  .header-swachh-container img {
    height: 45px !important;
  }
}