/* Responsive Breakpoints */
/* Mobile: 0 - 767px */
/* Tablet: 768px - 1023px */
/* Desktop: 1024px+ */

/* Mobile Styles (Default) */
.page-content {
  padding-bottom: calc(var(--navbar-height-mobile) + var(--spacing-md));
  min-height: 100vh;
}

/* Navigation - Mobile Bottom Bar */
.navbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height-mobile);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-border);
  z-index: var(--z-navbar);
  padding: 0 var(--spacing-sm);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.navbar-menu {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex: 1;
  gap: var(--spacing-xs);
}

.navbar-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-tertiary-label);
  transition: color var(--animation-fast) var(--animation-curve);
  text-decoration: none;
}

.navbar-item.active {
  color: var(--color-primary);
}

.navbar-label {
  font-size: var(--font-size-subhead);
  font-weight: var(--font-weight-medium);
}

.navbar-actions {
  display: none;
}

.navbar-brand {
  display: none;
}

/* Tablet Styles */
@media (min-width: 768px) {
  .page-content {
    padding-bottom: var(--spacing-xl);
  }
  
  .container {
    padding: 0 var(--spacing-lg);
  }
}

/* Desktop Styles */
@media (min-width: 1024px) {
  .page-content {
    padding-top: calc(var(--navbar-height-desktop) + var(--spacing-lg));
    padding-bottom: var(--spacing-xl);
  }
  
  /* Navigation - Desktop Top Bar */
  .navbar {
    top: 0;
    bottom: auto;
    height: var(--navbar-height-desktop);
    border-top: none;
    border-bottom: 1px solid var(--glass-border);
  }
  
  .navbar-inner {
    max-width: var(--content-max-width);
    padding: 0 var(--spacing-lg);
  }
  
  .navbar-brand {
    display: flex !important;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-headline);
    font-weight: var(--font-weight-semibold);
    color: var(--color-label);
    text-decoration: none;
    flex: 1;
  }
  
  .navbar-menu {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex: 1;
  }
  
  .navbar-item {
    padding: var(--spacing-sm) var(--spacing-sm);
    border-radius: var(--radius-md);
  }
  
  .navbar-item:hover {
    background: var(--color-surface);
  }
  
  .navbar-actions {
    display: flex !important;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
    flex: 1;
  }
}

/* Grid Layouts */
.grid-1 {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

@media (max-width: 767px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Hide/Show Utilities */
@media (max-width: 767px) {
  .hide-mobile {
    display: none !important;
  }
}

@media (min-width: 768px) {
  .hide-tablet-up {
    display: none !important;
  }
}

@media (min-width: 1024px) {
  .hide-desktop {
    display: none !important;
  }
}

/* Touch-friendly adjustments */
@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 44px;
  }
  
  .form-input,
  .form-select {
    min-height: 48px;
  }
  
  .option-item {
    min-height: 48px;
  }
}