/* ============================================
   Biostarhealth - Components CSS
   Reusable components: nav, footer, buttons, cards
   ============================================ */

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--neutral-white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

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

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--container-padding);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--primary-teal);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.navbar-brand:hover {
  transform: scale(1.05);
  color: var(--primary-teal-dark);
}

.navbar-brand-icon {
  width: 32px;
  height: 32px;
  fill: var(--primary-teal);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.navbar-link {
  color: var(--neutral-text);
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
  padding: var(--spacing-sm) 0;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-teal);
  transition: width var(--transition-base);
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--primary-teal);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--neutral-dark);
  font-size: var(--fs-2xl);
}

.navbar-toggle:focus-visible {
  outline: 2px solid var(--primary-teal);
  outline-offset: 2px;
  border-radius: var(--border-radius);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .navbar-toggle {
    display: block;
  }
  
  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--neutral-white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: var(--z-dropdown);
    gap: var(--spacing-md);
  }
  
  .navbar-menu.active {
    transform: translateX(0);
  }
  
  .navbar-link {
    width: 100%;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--neutral-light-alt);
  }
  
  .navbar-link::after {
    display: none;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--fs-base);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--primary-teal);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--primary-teal);
  color: var(--neutral-white);
  border-color: var(--primary-teal);
}

.btn-primary:hover {
  background-color: var(--primary-teal-dark);
  border-color: var(--primary-teal-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: aliceblue;
}

.btn-secondary {
  background-color: var(--secondary-green);
  color: var(--neutral-white);
  border-color: var(--secondary-green);
}

.btn-secondary:hover {
  background-color: #45a049;
  border-color: #45a049;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-teal);
  border-color: var(--primary-teal);
}

.btn-outline:hover {
  background-color: var(--primary-teal);
  color: var(--neutral-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background-color: var(--accent-coral);
  color: var(--neutral-white);
  border-color: var(--accent-coral);
}

.btn-accent:hover {
  background-color: #ff5252;
  border-color: #ff5252;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--fs-lg);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--fs-sm);
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background-color: var(--neutral-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  padding: var(--spacing-md);
  background: linear-gradient(135deg, var(--primary-teal), var(--primary-teal-dark));
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--neutral-white);
}

.card-title {
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--neutral-dark);
  margin-bottom: var(--spacing-sm);
}

.card-body {
  flex: 1;
  color: var(--neutral-text-light);
  line-height: 1.7;
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--neutral-light-alt);
}

.card-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
}

.badge-active {
  background-color: var(--secondary-green);
  color: var(--neutral-white);
}

.badge-construction {
  background-color: var(--accent-coral);
  color: var(--neutral-white);
}

.badge-featured {
  background-color: var(--primary-teal);
  color: var(--neutral-white);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background-color: var(--neutral-dark);
  color: var(--neutral-white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-4xl);
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
  color: var(--neutral-white);
  font-size: var(--fs-lg);
  margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--fs-sm);
  line-height: 1.8;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary-teal);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.footer-social a:hover {
  background-color: var(--primary-teal);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--fs-sm);
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-subtitle {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: rgba(0, 168, 168, 0.1);
  color: var(--primary-teal);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: var(--fs-4xl);
  margin-bottom: var(--spacing-md);
  color: var(--neutral-dark);
}

.section-description {
  font-size: var(--fs-lg);
  color: var(--neutral-text-light);
  line-height: 1.8;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  background-color: var(--primary-teal);
  color: var(--neutral-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-fixed);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--primary-teal-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  fill: var(--neutral-white);
}

/* ============================================
   Loading States
   ============================================ */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--neutral-white);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 768px) {
  .section-title {
    font-size: var(--fs-3xl);
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 45px;
    height: 45px;
  }
}