/* ============================================
   String of Turtles — Layout
   Container + Grid + Responsive
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Main content offset for fixed nav --- */
.main-content {
  min-height: calc(100vh - var(--nav-height) - 200px);
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-4xl);
}

/* --- Section spacing --- */
.section {
  padding: var(--space-3xl) 0;
}

.section + .section {
  padding-top: 0;
}

/* --- Grid system --- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

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

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .grid { gap: var(--space-xl); }
}

/* --- Sidebar layout --- */
.layout-sidebar {
  display: grid;
  gap: var(--space-2xl);
}

@media (min-width: 1024px) {
  .layout-sidebar {
    grid-template-columns: 1fr 300px;
    align-items: start;
  }
}

/* --- Flex utilities --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* --- Text utilities --- */
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--color-text-secondary); }
.text-primary { color: var(--color-primary); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

/* --- Margin/Padding helpers --- */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* --- Divider --- */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

/* --- Skeleton loading --- */
@keyframes skeleton-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border) 25%,
    #f0f0f0 50%,
    var(--color-border) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text { height: 1em; margin-bottom: 0.5em; }
.skeleton-title { height: 1.5em; width: 70%; margin-bottom: 1em; }
.skeleton-img  { width: 100%; height: 180px; }

/* --- Fade in animation --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeInUp 0.4s ease both;
}

/* --- Article meta --- */
.article-item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: var(--space-sm);
}

/* --- Tag list --- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-lighter);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--color-primary-lighter);
  color: var(--color-primary-dark);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-2xl);
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

.pagination .current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* --- Search bar --- */
.search-bar {
  display: flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  transition: border-color var(--transition-fast);
}

.search-bar:focus-within {
  border-color: var(--color-primary);
}

.search-bar input {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  border: none;
  background: transparent;
  font-family: inherit;
  color: var(--color-text);
  outline: none;
}

.search-bar button {
  padding: 0.75rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-bar button:hover {
  background: var(--color-primary-dark);
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 2px; }
.breadcrumb .current { color: var(--color-text); }

/* --- Toast notification --- */
.toast-container {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: #fff;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.3s ease;
  max-width: 320px;
}

.toast.success { background: var(--color-primary); }
.toast.error   { background: #DC2626; }