/* Header & Navigation Styles */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-8);
}

/* Logo / Doctor Name */
.site-logo {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-logo h1 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.2;
}

.site-logo .specialty {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* Desktop Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.main-nav a {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
  border-radius: var(--radius-base);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* CTA Button in Header */
.header-cta {
  margin-left: var(--space-4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-20) var(--space-6) var(--space-6);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
  }

  .main-nav.active {
    transform: translateX(0);
  }

  .main-nav a {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
  }

  .header-cta {
    margin-left: 0;
    margin-top: var(--space-4);
  }

  .header-cta .btn {
    width: 100%;
  }

  /* Overlay */
  .mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    z-index: 999;
  }

  .mobile-overlay.active {
    opacity: 1;
    pointer-events: auto;
  }

  .site-logo h1 {
    font-size: var(--text-lg);
  }

  .site-logo .specialty {
    font-size: var(--text-xs);
  }
}

@media (max-width: 480px) {
  .header-container {
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }
}