/* --- Design Tokens --- */
:root {
  --pb-primary: #1a73e8;
  --pb-primary-hover: #1557b0;
  --pb-text-primary: #202124;
  --pb-text-secondary: #5f6368;
  --pb-border: #dadce0;
  --pb-surface: #ffffff;
  --pb-surface-variant: #f1f3f4;
  --pb-background: #f8f9fa;
  --pb-shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --pb-shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
  --pb-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --pb-transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Font Family --- */
body {
  font-family: 'Google Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

code, pre {
  font-family: 'Source Code Pro', 'Fira Code', monospace;
}

/* --- Light Theme Overrides --- */
.light {
  --bg: var(--pb-background);
  --fg: var(--pb-text-primary);
  --sidebar-bg: var(--pb-surface);
  --sidebar-fg: var(--pb-text-primary);
  --sidebar-active: var(--pb-primary);
  --links: var(--pb-primary);
  --search-mark-bg: rgba(26, 115, 232, 0.15);
}

/* --- Sidebar Styling --- */
.sidebar .sidebar-scrollbox {
  background: var(--pb-surface);
}

/* Active sidebar item: left blue border + light blue background */
.sidebar .sidebar-scrollbox .active {
  border-left: 3px solid var(--pb-primary);
  background-color: rgba(26, 115, 232, 0.08);
  padding-left: 10px;
}

.sidebar .sidebar-scrollbox a {
  color: var(--pb-text-primary);
  transition: color var(--pb-transition-fast), background-color var(--pb-transition-fast);
}

.sidebar .sidebar-scrollbox a:hover {
  color: var(--pb-primary);
  background-color: var(--pb-surface-variant);
}

/* --- Menu Bar --- */
.menu-bar {
  border-bottom: 1px solid var(--pb-border);
}

.menu-title {
  font-weight: 500;
  color: var(--pb-text-primary);
}

/* --- Content Area --- */
.content main {
  max-width: 900px;
  padding: 0 24px;
}

.content main h1 {
  font-weight: 600;
  color: var(--pb-text-primary);
  border-bottom: 1px solid var(--pb-border);
  padding-bottom: 12px;
}

.content main h2 {
  font-weight: 600;
  color: var(--pb-text-primary);
}

.content main a {
  color: var(--pb-primary);
  text-decoration: none;
}

.content main a:hover {
  text-decoration: underline;
}

/* --- Code Blocks --- */
.content main pre {
  border: 1px solid var(--pb-border);
  border-radius: 8px;
}

/* --- Language Switcher Button --- */
#lang-switch {
  font-size: 14px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 4px;
  color: var(--pb-primary);
  text-decoration: none;
  transition: background-color var(--pb-transition-fast);
}

#lang-switch:hover {
  background-color: rgba(26, 115, 232, 0.08);
}

/* --- Feature Cards (Home page) --- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 40px 0;
}

.feature-card {
  background-color: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: 8px;
  padding: 28px;
  transition: box-shadow var(--pb-transition-normal), border-color var(--pb-transition-normal);
}

.feature-card:hover {
  box-shadow: var(--pb-shadow-md);
  border-color: var(--pb-primary);
}

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: rgba(26, 115, 232, 0.08);
  color: var(--pb-primary);
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card__title {
  font-size: 18px;
  font-weight: 600;
  color: var(--pb-text-primary);
  margin: 0 0 8px;
}

.feature-card__description {
  font-size: 15px;
  color: var(--pb-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   Hero Section (Home page)
   ========================================================================== */

.hero {
  text-align: center;
  padding: 48px 0 32px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  color: var(--pb-text-primary);
  border-bottom: none !important;
  padding-bottom: 0 !important;
}

.hero .tagline {
  font-size: 20px;
  color: var(--pb-text-secondary);
  margin-top: 12px;
}

.hero .cta-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.hero .cta-buttons a {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 4px;
  font-weight: 500;
  text-decoration: none;
  transition: background-color var(--pb-transition-fast), box-shadow var(--pb-transition-fast);
}

.hero .cta-buttons .primary {
  background-color: var(--pb-primary);
  color: #ffffff;
}

.hero .cta-buttons .primary:hover {
  background-color: var(--pb-primary-hover);
  box-shadow: var(--pb-shadow-sm);
}

.hero .cta-buttons .secondary {
  border: 1px solid var(--pb-border);
  color: var(--pb-primary);
  background-color: var(--pb-surface);
}

.hero .cta-buttons .secondary:hover {
  background-color: var(--pb-surface-variant);
}

/* --- Story Section --- */
.story-section {
  background-color: var(--pb-surface-variant);
  border-radius: 8px;
  padding: 32px;
  margin: 32px 0;
}

.story-section h2 {
  border-bottom: none !important;
}

/* ==========================================================================
   Playground Container (inline code editors)
   ========================================================================== */

.playground {
  margin: 24px 0;
}

.playground-container {
  margin-top: 16px;
}

.playground-container iframe {
  width: 100%;
  height: 400px;
  border: 1px solid var(--pb-border);
  border-radius: 8px;
  background-color: var(--pb-surface);
}

/* ==========================================================================
   Before/After Visual (Excel → JSON transformation)
   ========================================================================== */

.before-after {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 32px 0;
  padding: 28px;
  background-color: var(--pb-surface-variant);
  border-radius: 12px;
}

.before-after__label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pb-text-secondary);
  margin-bottom: 8px;
}

.before-after__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--pb-primary);
  font-weight: 700;
  padding: 4px 0;
}

.before-after__input,
.before-after__output {
  min-width: 0;
}

.before-after__input table,
.before-after__output table {
  font-size: 15px;
}

.before-after__output pre {
  margin: 0 !important;
  font-size: 15px;
}

/* Before/After is already vertical (flex-column), so mobile just adjusts padding */
@media (max-width: 768px) {
  .before-after {
    padding: 20px;
  }

  .before-after__arrow {
    font-size: 24px;
  }
}

/* ==========================================================================
   Hero Sub-tagline
   ========================================================================== */

.hero-sub {
  font-size: 16px;
  color: var(--pb-text-secondary);
  margin-top: 8px;
  font-weight: 400;
}

/* ==========================================================================
   Enhanced Table Styling
   ========================================================================== */

.content main table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 15px;
  border: 1px solid var(--pb-border);
  border-radius: 8px;
  overflow: hidden;
}

.content main table thead {
  background-color: var(--pb-surface-variant);
}

.content main table th {
  font-weight: 600;
  color: var(--pb-text-primary);
  padding: 14px 16px;
  text-align: left;
  border-bottom: 2px solid var(--pb-border);
  font-size: 15px;
}

.content main table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--pb-border);
  color: var(--pb-text-primary);
}

.content main table tbody tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.02);
}

.content main table tbody tr:hover {
  background-color: rgba(26, 115, 232, 0.04);
}

.content main table code {
  font-size: 14px;
  padding: 2px 6px;
  background-color: var(--pb-surface-variant);
  border-radius: 4px;
}

/* ==========================================================================
   Details / Summary (Collapsible FAQ)
   ========================================================================== */

.content main details {
  margin: 16px 0;
  padding: 16px 20px;
  background-color: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: 8px;
  transition: border-color var(--pb-transition-fast);
}

.content main details[open] {
  border-color: var(--pb-primary);
}

.content main details summary {
  cursor: pointer;
  font-size: 16px;
  color: var(--pb-text-primary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.content main details summary::before {
  content: '▶';
  font-size: 11px;
  color: var(--pb-primary);
  transition: transform var(--pb-transition-fast);
}

.content main details[open] summary::before {
  transform: rotate(90deg);
}

.content main details summary::-webkit-details-marker {
  display: none;
}

.content main details > *:not(summary) {
  margin-top: 12px;
  color: var(--pb-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ==========================================================================
   Blockquote as Navigation Footer
   ========================================================================== */

.content main blockquote {
  border-left: 3px solid var(--pb-primary);
  background-color: rgba(26, 115, 232, 0.04);
  padding: 20px 24px;
  margin: 32px 0;
  border-radius: 0 8px 8px 0;
  font-size: 15px;
}

.content main blockquote strong {
  color: var(--pb-primary);
}

/* ==========================================================================
   Syntax Reference Table (Path → Output mapping)
   ========================================================================== */

.syntax-table {
  margin: 24px 0;
}

.syntax-table table {
  table-layout: fixed;
}

.syntax-table table th:first-child {
  width: 30%;
}

.syntax-table table th:nth-child(2) {
  width: 25%;
}

.syntax-table table th:last-child {
  width: 45%;
}

/* ==========================================================================
   Category Headers for Skip Reasons
   ========================================================================== */

.skip-category {
  margin-top: 32px;
  margin-bottom: 8px;
  padding: 8px 16px;
  background-color: var(--pb-surface-variant);
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  color: var(--pb-text-primary);
}

/* ==========================================================================
   Concept Diagram (visual explanation boxes)
   ========================================================================== */

.concept-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: start;
  margin: 24px 0;
  padding: 20px;
  background-color: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: 8px;
}

.concept-diagram__panel {
  padding: 12px;
}

.concept-diagram__panel-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pb-primary);
  margin-bottom: 8px;
}

.concept-diagram__connector {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--pb-primary);
  padding-top: 30px;
}

@media (max-width: 768px) {
  .concept-diagram {
    grid-template-columns: 1fr;
  }

  .concept-diagram__connector {
    padding-top: 0;
  }
}

/* ==========================================================================
   Content Typography Improvements
   ========================================================================== */

.content main {
  font-size: 16px;
  line-height: 1.8;
}

.content main p {
  margin-bottom: 16px;
}

.content main h2 {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--pb-border);
}

.content main h2:first-of-type {
  border-top: none;
  margin-top: 0;
}

.content main h3 {
  margin-top: 32px;
  color: var(--pb-text-primary);
}

.content main > pre {
  margin: 20px 0;
}

/* Inline code styling */
.content main :not(pre) > code {
  padding: 2px 6px;
  background-color: var(--pb-surface-variant);
  border-radius: 4px;
  font-size: 0.875em;
  color: var(--pb-primary);
}

/* ==========================================================================
   Responsive: Playground
   ========================================================================== */

@media (max-width: 768px) {
  .playground-container iframe {
    height: 500px;
  }
}