/* CKA Mind Map - Dark Kubernetes Theme */

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

:root {
  --k8s-blue: #326CE5;
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-panel: #1c2333;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-family);
  background: var(--bg-dark);
  color: var(--text-primary);
}

body {
  display: flex;
  flex-direction: column;
}

/* === Header === */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  padding-top: max(12px, env(safe-area-inset-top, 0px));
  padding-left: max(24px, env(safe-area-inset-left, 0px));
  padding-right: max(24px, env(safe-area-inset-right, 0px));
  background: linear-gradient(180deg, rgba(13, 17, 23, 0.98) 0%, rgba(13, 17, 23, 0.92) 100%);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 10;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--k8s-blue);
}

.logo-version {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  padding: 2px 8px;
  background: rgba(50, 108, 229, 0.1);
  border-radius: 10px;
  border: 1px solid rgba(50, 108, 229, 0.2);
}

/* === Breadcrumbs === */
#breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  flex-wrap: nowrap;
  overflow: hidden;
  min-width: 0;
}

.breadcrumb-link {
  color: var(--k8s-blue);
  text-decoration: none;
  transition: color 0.2s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 280px;
}

.breadcrumb-link:hover {
  color: #5a8ef0;
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--text-muted);
  font-size: 16px;
  user-select: none;
  flex-shrink: 0;
}

.breadcrumb-current {
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* === Study Guides Menu === */
.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
  overflow: visible;
}

.github-link {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  transition: color 0.2s;
}

.github-link:hover {
  color: var(--text-primary);
}

.guides-dropdown {
  position: relative;
}

.guides-dropdown-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(50, 108, 229, 0.1);
  border: 1px solid rgba(50, 108, 229, 0.25);
  border-radius: 8px;
  color: var(--k8s-blue);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  white-space: nowrap;
}

.guides-dropdown-btn:hover {
  background: rgba(50, 108, 229, 0.18);
  border-color: rgba(50, 108, 229, 0.4);
  color: #5a8ef0;
}

.guides-dropdown-btn .dropdown-arrow {
  font-size: 10px;
  transition: transform 0.2s;
}

.guides-dropdown.open .dropdown-arrow {
  transform: rotate(180deg);
}

.guides-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 260px;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.2s;
  z-index: 100;
}

.guides-dropdown.open .guides-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.guides-dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.15s;
  border-bottom: 1px solid var(--border-subtle);
}

.guides-dropdown-menu a:last-child {
  border-bottom: none;
}

.guides-dropdown-menu a:hover {
  background: rgba(50, 108, 229, 0.08);
  color: var(--text-primary);
}

.guides-dropdown-menu .guide-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.guides-dropdown-menu .guide-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.guides-dropdown-menu .guide-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 13px;
}

.guides-dropdown-menu .guide-desc {
  font-size: 11px;
  color: var(--text-muted);
}

/* === Subtitle === */
.subtitle-bar {
  text-align: center;
  padding: 6px 24px;
  background: rgba(50, 108, 229, 0.04);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

#subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.subtitle-guide-link {
  display: inline-block;
  margin-left: 12px;
  padding: 3px 12px;
  background: rgba(255, 152, 0, 0.1);
  border: 1px solid rgba(255, 152, 0, 0.3);
  border-radius: 12px;
  color: #FF9800;
  font-size: 11px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  vertical-align: middle;
}

.subtitle-guide-link:hover {
  background: rgba(255, 152, 0, 0.2);
  border-color: rgba(255, 152, 0, 0.5);
  color: #FFB74D;
  text-decoration: none;
}

/* === Mind Map Container === */
#mindmap-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  z-index: 1;
  isolation: isolate;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(50, 108, 229, 0.04) 0%, transparent 60%),
    var(--bg-dark);
}

/* Grid pattern background */
#mindmap-container::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

#mindmap-container svg {
  display: block;
}

/* === Mind Map Nodes === */
.branch-node {
  transition: transform 0.2s ease;
}

.branch-node.clickable:hover,
.branch-node.leaf:hover {
  filter: url(#glow);
}

.branch-node.clickable rect,
.branch-node.leaf rect {
  transition: all 0.2s ease;
}

/* === Tooltip === */
.mindmap-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--bg-panel);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  white-space: nowrap;
  z-index: 20;
  opacity: 0;
  transform: translate(-50%, 0) scale(0.9);
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* === Back Button === */
.back-button circle {
  transition: all 0.2s ease;
}

.back-button:hover circle {
  fill: rgba(255, 255, 255, 0.15);
  stroke: rgba(255, 255, 255, 0.5);
}

/* === Detail Panel (Leaf Node Content) === */
.detail-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

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

.detail-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 3px solid var(--k8s-blue);
  border-radius: 16px;
  width: 90%;
  max-width: 640px;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.3s ease;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.detail-panel-top {
  flex-shrink: 0;
  padding: 28px 32px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.detail-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 32px 28px;
}

.detail-overlay.active .detail-panel {
  transform: translateY(0) scale(1);
}

.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.detail-header h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.detail-close {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.detail-close:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

.detail-description {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 16px;
  line-height: 1.5;
}

.detail-section {
  margin-bottom: 24px;
}

.detail-section h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.detail-section ul {
  list-style: none;
  padding: 0;
}

.detail-section ul li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.detail-section ul li:last-child {
  border-bottom: none;
}

.detail-section ul li::before {
  content: '\25B8';
  position: absolute;
  left: 0;
  color: var(--k8s-blue);
  font-size: 12px;
}

.detail-section pre {
  background: var(--bg-dark);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 8px;
  overflow-x: auto;
}

.detail-section pre code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12.5px;
  line-height: 1.6;
  color: #79c0ff;
  white-space: pre-wrap;
  word-break: break-all;
}

/* === References === */
.detail-references {
  list-style: none;
  padding: 0;
}

.detail-references li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  position: relative;
  padding-left: 20px;
}

.detail-references li:last-child {
  border-bottom: none;
}

.detail-references li::before {
  content: '\1F4D6';
  position: absolute;
  left: 0;
  font-size: 11px;
}

.detail-ref-link {
  color: var(--k8s-blue);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  display: block;
  transition: color 0.2s;
}

.detail-ref-link:hover {
  color: #5a8ef0;
  text-decoration: underline;
}

.detail-ref-url {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  word-break: break-all;
}

/* Scrollbar */
.detail-panel-body::-webkit-scrollbar {
  width: 6px;
}

.detail-panel-body::-webkit-scrollbar-track {
  background: transparent;
}

.detail-panel-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.detail-panel-body::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* === Footer === */
.footer {
  padding: 8px 24px;
  padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
  padding-left: max(24px, env(safe-area-inset-left, 0px));
  padding-right: max(24px, env(safe-area-inset-right, 0px));
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-dark);
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.footer a {
  color: var(--k8s-blue);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.footer-credit {
  color: var(--k8s-blue);
  font-size: 12px;
  margin-top: 2px;
}

.footer-credit strong {
  color: var(--text-primary);
}

/* === Responsive === */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 8px;
    padding: 10px 16px;
    align-items: stretch;
  }

  .header-right {
    justify-content: space-between;
  }

  .breadcrumb-link {
    max-width: 200px;
  }

  .breadcrumb-early {
    display: none;
  }

  .detail-panel {
    width: 95%;
    max-height: 85vh;
  }

  .detail-panel-top {
    padding: 20px 20px 0;
  }

  .detail-panel-body {
    padding: 0 20px 20px;
  }

  .detail-header h2 {
    font-size: 18px;
  }

  .logo-version {
    display: none;
  }
}

@media (max-width: 480px) {
  #breadcrumbs {
    font-size: 11px;
  }

  .logo-text {
    font-size: 13px;
  }
}

/* === CSS Animations (replaces D3 transitions) === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.anim-fade {
  animation: fadeIn 0.5s ease both;
}

/* Tooltip visible state */
.mindmap-tooltip.visible {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

/* === Kubernetes Logo SVG inline === */
.k8s-logo {
  display: inline-block;
}