/* ============================================
   Layout — Grid, Sidebar, Responsive
   ============================================ */

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: var(--leading-normal);
  overflow: hidden;
  height: 100vh;
}

/* App Shell */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ---- Sidebar ---- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: min-width var(--transition-normal), width var(--transition-normal);
  z-index: var(--z-sidebar);
}

.sidebar.collapsed {
  width: 0;
  min-width: 0;
  border-right: none;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.sidebar-header h1 {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.sidebar-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

.sidebar-tree {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-2) 0;
}

/* Scrollbar styling */
.sidebar-tree::-webkit-scrollbar {
  width: 6px;
}

.sidebar-tree::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-tree::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

.sidebar-tree::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ---- Main Content ---- */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Top bar (breadcrumbs + toggle + filters) */
.topbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-secondary);
  flex-shrink: 0;
  min-height: var(--header-height);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Mobile sidebar toggle (visible when sidebar collapsed) */
.mobile-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  display: none;
  align-items: center;
  justify-content: center;
}

.sidebar.collapsed ~ .main-content .mobile-toggle {
  display: flex;
}

.mobile-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

.breadcrumbs .separator {
  color: var(--text-tertiary);
}

.breadcrumbs .current {
  color: var(--text-primary);
}

/* Scrollable content area */
.content-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-6);
}

.content-area::-webkit-scrollbar {
  width: 8px;
}

.content-area::-webkit-scrollbar-track {
  background: transparent;
}

.content-area::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 4px;
}

.content-area::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ---- Charts Grid (Main Page) ---- */
.charts-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.chart-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.chart-container-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-secondary);
}

.chart-container-header h3 {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.chart-wrapper {
  height: 500px;
  position: relative;
}

/* Single chart layout (group page) */
.chart-single {
  margin-bottom: var(--space-6);
}

.chart-single .chart-wrapper {
  height: 550px;
}

/* ---- Card Grid ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
  gap: var(--space-4);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.section-header h2 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.section-header .count {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  background: var(--bg-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

/* ---- Example Detail Layout ---- */
.example-detail {
  max-width: 960px;
}

.example-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
}

.example-title {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-2);
}

.example-chart-embed {
  margin-bottom: var(--space-6);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-primary);
}

.example-chart-embed iframe {
  display: block;
}

.example-notes {
  margin-bottom: var(--space-6);
}

.example-notes h3 {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
}

.example-notes p {
  color: var(--text-secondary);
  line-height: var(--leading-normal);
  white-space: pre-wrap;
}

.example-images {
  margin-bottom: var(--space-6);
}

.example-images h3 {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}

.image-grid img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
  cursor: pointer;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.image-grid img:hover {
  border-color: var(--accent-blue);
  transform: scale(1.02);
}

.example-nav {
  display: flex;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-primary);
}

/* ---- Filter Bar ---- */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

/* ---- Responsive ---- */
@media (max-width: 1200px) {
  .charts-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: var(--z-sidebar);
    transform: translateX(0);
    transition: transform var(--transition-normal);
  }

  .sidebar.collapsed {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
  }

  .mobile-toggle {
    display: flex !important;
  }

  .charts-row {
    grid-template-columns: 1fr;
  }

  .content-area {
    padding: var(--space-4);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .content-area {
    padding: var(--space-3);
  }

  .example-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}