/**
 * JSON Analyst — Professional Stylesheet
 * Modern design system with refined typography, dark mode support, and cohesive SVG icons
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg-page: #0a0e1a;
  --bg-surface: #141824;
  --bg-surface-elevated: #1e2736;
  --bg-canvas: #06080f;
  --border-subtle: #2a3442;
  --border-strong: #3f4a5c;
  --text-primary: #f0f5fc;
  --text-secondary: #cbd5e1;
  --text-muted: #8b96a5;
  --text-dim: #6b7684;
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-purple: #7c3aed;
  --accent-purple-hover: #8b5cf6;
  --accent-mint: #10b981;
  --accent-lavender: #a78bfa;
  --chart-primary: #3b82f6;
  --chart-secondary: #1f6feb;
  --chart-tertiary: #0d47a1;
  --success-green: #22863a;
  --success-bg: rgba(34, 134, 58, 0.12);
  --success-border: rgba(40, 167, 69, 0.35);
  --error-red: #dc3545;
  --error-bg: rgba(220, 53, 69, 0.12);
  --error-border: rgba(255, 71, 87, 0.35);
  --gutter-bg: #0f1419;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-page: #0d1117;
    --bg-surface: #161b22;
    --bg-surface-elevated: #21262d;
  }
}

html.light,
:root[data-theme="light"] {
  --bg-page: #ffffff;
  --bg-surface: #f5f8fb;
  --bg-surface-elevated: #eff2f8;
  --bg-canvas: #fafbfc;
  --border-subtle: #d1dae5;
  --border-strong: #bcc8d4;
  --text-primary: #1a202c;
  --text-secondary: #2d3748;
  --text-muted: #718096;
  --text-dim: #a0aec0;
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --chart-primary: #3b82f6;
  --chart-secondary: #1f6feb;
  --chart-tertiary: #0d47a1;
  --success-green: #22863a;
  --success-bg: #dafbe1;
  --success-border: #4ac26b;
  --error-red: #dc3545;
  --error-bg: #f8d7da;
  --error-border: #f5c6cb;
  --gutter-bg: #f5f8fb;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg-page);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.3s ease, color 0.3s ease;
}

/* MAIN NAVIGATION BAR */
.main-nav-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  z-index: 40;
}

.nav-bar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
}

.nav-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 8px;
}

.nav-tool-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.nav-tool-link:hover {
  background: var(--bg-surface-elevated);
  color: var(--accent-blue);
  border-color: var(--border-subtle);
}

.nav-tool-link:active {
  background: var(--bg-canvas);
  color: var(--accent-blue-hover);
}

.nav-tool-link.active {
  background: var(--bg-surface-elevated);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.nav-tool-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

/* HEADER */
header.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-page);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-icon-box {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent-blue);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-title span {
  color: var(--accent-blue);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}

#theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
  position: relative;
}

#theme-toggle:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.header-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
  position: relative;
  text-decoration: none;
  line-height: 1;
}

.header-icon-link:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.15);
}

.header-icon-link:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

#github-link::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg"><path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v 3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" fill="currentColor"/></svg>');
}

#theme-toggle::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

:root:not([data-theme="light"]) #theme-toggle::before {
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg"><circle cx="12" cy="12" r="5" fill="%238b949e"/><path d="M12 1v6m0 6v6M4.22 4.22l4.24 4.24m6.08 0l4.24-4.24M1 12h6m6 0h6m-16.78 7.78l4.24-4.24m6.08 0l4.24 4.24" stroke="%238b949e" stroke-width="2" stroke-linecap="round"/></svg>');
}

:root[data-theme="light"] #theme-toggle::before {
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" fill="%231f2328" xmlns="http://www.w3.org/2000/svg"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>');
}

/* TOOL NAVIGATION BAR */
.tool-nav-bar {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
}

.tool-nav-inner {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-top: none;
  border-radius: 0 0 8px 8px;
  padding: 5px 8px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  white-space: nowrap;
  transition: all 0.2s ease;
  position: relative;
}

.nav-pill:hover {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
}

.nav-pill.active {
  color: #ffffff;
  background: var(--accent-blue);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.15);
}

.nav-pill.pill-chart.active {
  background: var(--accent-purple);
  box-shadow: 0 2px 8px rgba(124, 58, 237, 0.15);
}

/* MAIN CONTENT CONTAINER */
main.app-main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  font-family: var(--font-display);
}

.page-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
  max-width: 600px;
}

/* VIEW PANELS */
.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* EDITOR SECTION */
.editor-card {
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background: var(--bg-page);
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  transition: all 0.3s ease;
}

.editor-card:hover {
  border-color: var(--border-strong);
}

.editor-card-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.editor-header-left, .editor-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-preset {
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-family: var(--font-sans);
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.select-preset:hover {
  border-color: var(--accent-blue);
  background: var(--bg-surface);
}

.select-preset:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.1);
}

.editor-counter {
  font-size: 11.5px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.btn-upload-file {
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-upload-file:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: var(--bg-surface-elevated);
}

.btn-upload-file:active {
  transform: scale(0.97);
}

.editor-core-area {
  display: flex;
  height: 380px;
  position: relative;
  background: var(--bg-page);
}

.drop-overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.08);
  outline: 2px dashed var(--accent-blue);
  outline-offset: -6px;
  border-radius: 6px;
  pointer-events: none;
  z-index: 5;
}

.drop-overlay span {
  background: var(--bg-surface-elevated);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
}

.editor-core-area.drag-over .drop-overlay {
  display: flex;
}

.line-numbers-gutter {
  width: 48px;
  background: var(--gutter-bg);
  border-right: 1px solid var(--border-subtle);
  padding: 12px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
  text-align: right;
  user-select: none;
  overflow: hidden;
}

textarea.json-code-input {
  flex: 1;
  height: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  padding: 12px 16px;
  outline: none;
  resize: none;
  white-space: pre;
  tab-size: 2;
}

/* ACTION BUTTONS - Editor Controls */
.action-buttons-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.btn-action-primary {
  background: var(--accent-blue);
  color: #ffffff;
  border: none;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.1);
}

.btn-action-primary:hover {
  background: var(--accent-blue-hover);
  box-shadow: 0 4px 12px rgba(10, 132, 255, 0.2);
  transform: translateY(-1px);
}

.btn-action-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(10, 132, 255, 0.15);
}

.btn-action-chart {
  background: var(--accent-purple);
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(124, 58, 237, 0.1);
}

.btn-action-chart:hover {
  background: var(--accent-purple-hover);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.2);
  transform: translateY(-1px);
}

.btn-action-chart:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(124, 58, 237, 0.15);
}

.btn-action-sub {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 9px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-action-sub:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-blue);
  color: var(--text-primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.btn-action-sub:active {
  transform: scale(0.98);
}

/* STATUS BANNER (JSONLINT GREEN / RED BANNER) */
.status-banner {
  padding: 14px 18px;
  border-radius: 8px;
  margin-bottom: 24px;
  border: 1px solid;
}

.status-banner.success {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.status-banner.error {
  background: var(--error-bg);
  border-color: var(--error-border);
}

.banner-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.banner-title {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-banner.success .banner-title { color: var(--success-green); }
.status-banner.error .banner-title { color: var(--error-red); }

.banner-desc {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.status-chips-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.metric-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.metric-pill b { color: var(--text-primary); }
.metric-pill.alert { border-color: var(--error-red); color: var(--error-red); }

/* STRUCTURE CHART VIEW CONTAINER (MATCHING REFERENCE SCREENSHOT) */
.chart-view-card {
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  background: var(--bg-canvas);
  overflow: hidden;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.chart-toolbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.chart-title-tag {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-workspace {
  display: flex;
  min-height: 560px;
}

.chart-canvas-area {
  flex: 1;
  min-width: 0;
  height: 560px;
  position: relative;
  background: var(--bg-canvas);
}

#chart-canvas {
  width: 100%;
  height: 100%;
  background: var(--bg-surface);
}

.chart-inspector-side {
  width: 380px;
  flex: none;
  border-left: 1px solid var(--border-subtle);
  background: var(--bg-page);
  padding: 18px;
  overflow-y: auto;
  max-height: 560px;
}

@media (max-width: 1000px) {
  .chart-workspace { flex-direction: column; }
  .chart-inspector-side {
    width: auto;
    border-left: none;
    border-top: 1px solid var(--border-subtle);
    max-height: 420px;
  }
}

.chart-floating-controls {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 4px;
  display: flex;
  gap: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 5;
}

.chart-ctrl-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.chart-ctrl-btn:hover {
  background: var(--bg-canvas);
  color: var(--accent-blue);
}

/* CHART SLIDE-IN INSPECTOR */
.chart-inspector-drawer {
  position: absolute;
  top: 0;
  right: -380px;
  width: 360px;
  height: 100%;
  background: var(--bg-surface-elevated);
  border-left: 1px solid var(--border-subtle);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.3);
  transition: right 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  z-index: 20;
}

.chart-inspector-drawer.open {
  right: 0;
}

.drawer-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
}

.drawer-body {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
}

/* TREE VIEW SECTION */
.tree-view-card {
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  min-height: 480px;
  background: var(--bg-page);
  margin-bottom: 30px;
}

.tree-list-sidebar {
  width: 50%;
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
}

.tree-breadcrumbs-bar {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  white-space: nowrap;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
}

.breadcrumb-item:not(.active) {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
}

.breadcrumb-item:not(.active):hover {
  background: var(--bg-surface);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.15);
  transform: translateY(-1px);
}

.breadcrumb-item:not(.active):active {
  transform: translateY(0);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2) inset;
}

.breadcrumb-item.active {
  background: var(--accent-blue);
  color: #ffffff;
  font-weight: 600;
  border: 1px solid var(--accent-blue);
  padding: 6px 10px;
}

.breadcrumb-sep {
  display: inline-flex;
  align-items: center;
  margin: 0 2px;
  color: var(--text-muted);
  opacity: 0.5;
}

.breadcrumb-sep svg {
  width: 14px;
  height: 14px;
  stroke-width: 2;
}

.tree-search-bar {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  gap: 6px;
}

.app-search-input {
  flex: 1;
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-family: var(--font-sans);
  outline: none;
  transition: all 0.2s ease;
}

.app-search-input::placeholder {
  color: var(--text-dim);
}

.app-search-input:hover {
  border-color: var(--border-strong);
  background: var(--bg-surface);
}

.app-search-input:focus {
  border-color: var(--accent-blue);
  background: var(--bg-page);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.1);
}

.tree-list-scroll {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  max-height: 480px;
}

.tree-item-row { margin: 1px 0; }

.tree-node-bar {
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  user-select: none;
}

.tree-node-bar:hover { background: var(--bg-surface-elevated); }
.tree-node-bar.selected {
  background: rgba(10, 132, 255, 0.15);
  border: 1px solid var(--accent-blue);
}

.tree-node-label { color: var(--accent-lavender); }

.tree-inspector-side {
  flex: 1;
  padding: 18px;
  background: var(--bg-page);
  overflow-y: auto;
  max-height: 480px;
}

/* CARDS & INSPECTOR DETAILS */
.inspector-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 14px;
}

.inspector-card-header {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.inspector-table { display: flex; flex-direction: column; }
.table-row {
  display: flex;
  padding: 6px 0;
  border-bottom: 1px solid rgba(120, 120, 120, 0.1);
  font-size: 12px;
}
.table-row:last-child { border-bottom: none; }
.table-label { width: 120px; color: var(--text-muted); font-weight: 500; }
.table-value { flex: 1; font-family: var(--font-mono); word-break: break-all; }

.chips-flex { display: flex; flex-wrap: wrap; gap: 6px; }

.nav-chip {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--accent-lavender);
  padding: 3px 8px;
  border-radius: 5px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-chip:hover { border-color: var(--accent-purple); color: #ffffff; }

.archetype-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 11.5px;
  margin-top: 8px;
}

.archetype-grid th, .archetype-grid td {
  border: 1px solid var(--border-subtle);
  padding: 6px 10px;
  text-align: left;
}

.archetype-grid th { background: var(--bg-surface-elevated); color: var(--text-muted); }

.type-badge {
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
}

.type-object { background: rgba(121, 192, 255, 0.15); color: #79c0ff; }
.type-array { background: rgba(255, 166, 87, 0.15); color: #ffa657; }
.type-string { background: rgba(0, 229, 163, 0.15); color: var(--accent-mint); }
.type-number { background: rgba(210, 168, 255, 0.15); color: #d2a8ff; }
.type-boolean { background: rgba(255, 123, 114, 0.15); color: #ff7b72; }
.type-null { background: rgba(139, 148, 158, 0.15); color: var(--text-muted); }
.type-cycle { background: rgba(248, 81, 73, 0.25); color: var(--error-red); border: 1px dashed var(--error-red); }

/* ARTICLES & REFERENCES (JSONLINT STYLE) */
.articles-section {
  margin-top: 40px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.article-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* FOOTER */
footer.app-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: 28px 20px;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: auto;
  font-family: var(--font-sans);
  transition: all 0.3s ease;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-left {
  flex: 1;
  min-width: 250px;
}

.footer-text {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--accent-blue);
}

.footer-sep {
  color: var(--text-dim);
}

@media (max-width: 768px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

/* ===== NEW PANE SECTIONS ===== */
.pane-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 8px 0;
  letter-spacing: -0.5px;
}

.pane-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 24px 0;
  line-height: 1.5;
}

/* Output Card for Formatted/Repaired/Compacted/CSV output */
.output-card {
  margin-top: 20px;
  padding: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.output-header {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.output-card textarea {
  min-height: 200px;
  max-height: 400px;
  padding: 12px;
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  resize: vertical;
  overflow-y: auto;
}

/* Tools Gallery */
.tools-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.tool-card {
  padding: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.tool-card:hover {
  border-color: var(--accent-blue);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.tool-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.1);
  border-radius: 8px;
  color: var(--accent-blue);
}

.tool-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}

.tool-card h3 {
  margin: 8px 0 0 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.tool-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tool-card-btn {
  align-self: flex-start;
  padding: 8px 16px;
  background: var(--accent-blue);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 8px;
}

.tool-card-btn:hover {
  background: var(--accent-blue-hover);
  transform: translate(0, -2px);
}

.tool-card-btn:active {
  transform: translate(0, 0);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .tools-gallery {
    grid-template-columns: 1fr;
  }

  .pane-title {
    font-size: 24px;
  }
}

/* ============================================================
   NODE INSPECTOR (shared by Chart + Tree)
   ============================================================ */
.node-details {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-primary);
}

.detail-path {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-blue);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 14px;
  overflow-x: auto;
  white-space: nowrap;
}

.detail-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.detail-fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 8px 10px;
  min-width: 0;
}

.detail-fact-key {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.detail-fact-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
}

.detail-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 16px 0 8px;
}

.detail-table-wrap { overflow-x: auto; }

.detail-child-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 11px;
}

.detail-child-table th {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  padding: 6px 8px;
}

.detail-child-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}

.detail-child-key { color: var(--accent-blue); white-space: nowrap; }
.detail-child-type { color: var(--text-muted); white-space: nowrap; }
.detail-child-preview { color: var(--text-secondary); word-break: break-word; }

.detail-more {
  font-size: 11px;
  color: var(--text-muted);
  padding: 6px 8px;
}

.detail-json {
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.55;
  color: var(--text-primary);
  max-height: 320px;
  overflow: auto;
}

/* Selected chart node */
.node-circle.selected {
  fill: #ffffff;
  stroke: #4f9eff;
  stroke-width: 5;
}

/* ============================================================
   TREE ROWS
   ============================================================ */
.tree-chevron {
  width: 16px;
  height: 16px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 3px;
  color: var(--text-muted);
  font-size: 10px;
  cursor: pointer;
  padding: 0;
}

.tree-chevron:hover { background: var(--bg-surface); color: var(--accent-blue); }
.tree-chevron.placeholder { cursor: default; }

.tree-type-badge {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  flex: none;
}

.tree-type-badge.type-object,
.tree-type-badge.type-array { color: var(--accent-blue); }
.tree-type-badge.type-string { color: var(--success-green); }
.tree-type-badge.type-number { color: var(--accent-purple); }

.tree-node-preview {
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.tree-message {
  padding: 20px;
  color: var(--text-muted);
  font-size: 13px;
}

.tree-message.error { color: var(--error-red); }