/* ==========================================================================
   TruLang Professional Documentation Design System
   Modern, Clean, Human-Crafted Architecture with Light & Dark Themes
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens & CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Color Scheme Meta */
  color-scheme: light dark;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Accent Palette (Refined, Non-Garish) */
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-cyan: #0284c7;
  --accent-green: #059669;
  --accent-purple: #7c3aed;
  --accent-amber: #d97706;
  --accent-red: #dc2626;

  /* Transition Speeds */
  --trans-fast: 0.15s ease;
  --trans-normal: 0.2s ease;
}

/* Light Theme (Clean, Crisp, Stripe/Tailwind Style) */
:root,
:root[data-theme="light"] {
  color-scheme: light;
  scrollbar-color: #cbd5e1 transparent;

  --bg-canvas: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #f1f5f9;
  --bg-inset: #e2e8f0;
  
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #2563eb;

  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --brand-logo-bg: #0f172a;
  --brand-logo-text: #ffffff;

  --header-bg: rgba(255, 255, 255, 0.85);
  --header-border: #e2e8f0;

  --sidebar-bg: #ffffff;
  --sidebar-border: #e2e8f0;
  --sidebar-link-hover: #f1f5f9;
  --sidebar-link-active-bg: #eff6ff;
  --sidebar-link-active-color: #1d4ed8;

  --hero-bg: #ffffff;
  --hero-border: #e2e8f0;

  --card-bg: #ffffff;
  --card-header-bg: #f8fafc;
  --card-border: #e2e8f0;
  --card-body-bg: #ffffff;
  --card-hover-border: #cbd5e1;
  --card-hover-shadow: 0 4px 12px -2px rgba(15, 23, 42, 0.08);

  --btn-primary-bg: #0f172a;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #1e293b;
  --btn-secondary-bg: #ffffff;
  --btn-secondary-text: #334155;
  --btn-secondary-border: #cbd5e1;
  --btn-secondary-hover: #f8fafc;

  --badge-bg: #f1f5f9;
  --badge-text: #475569;
  --badge-border: #e2e8f0;

  --table-header-bg: #f8fafc;
  --table-border: #e2e8f0;
  --table-hover: #f8fafc;
  --table-highlight: #eff6ff;

  --code-bg: #0f172a;
  --code-text: #f8fafc;
  --code-header-bg: #1e293b;
  --code-header-border: #334155;

  --playground-bg: #ffffff;
  --playground-panel-bg: #f8fafc;
  --playground-editor-bg: #0f172a;
  --playground-editor-text: #f8fafc;
  --terminal-bg: #090d16;
  --terminal-text: #38bdf8;
  --terminal-border: #1e293b;

  --gauge-bg: #e2e8f0;
  --kpi-card-bg: #ffffff;
  --callout-bg: #eff6ff;
  --callout-border: #bfdbfe;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.06);
}

/* Dark Theme (Obsidian Slate, Elegant, Next.js / Bun Style) */
:root[data-theme="dark"] {
  color-scheme: dark;
  scrollbar-color: #334155 transparent;

  --bg-canvas: #090d16;
  --bg-surface: #0f172a;
  --bg-subtle: #1e293b;
  --bg-hover: #1e293b;
  --bg-inset: #040711;

  --border-color: #1e293b;
  --border-subtle: #334155;
  --border-focus: #38bdf8;

  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --brand-logo-bg: #38bdf8;
  --brand-logo-text: #090d16;

  --header-bg: rgba(9, 13, 22, 0.85);
  --header-border: #1e293b;

  --sidebar-bg: #090d16;
  --sidebar-border: #1e293b;
  --sidebar-link-hover: #1e293b;
  --sidebar-link-active-bg: rgba(56, 189, 248, 0.1);
  --sidebar-link-active-color: #38bdf8;

  --hero-bg: #0f172a;
  --hero-border: #1e293b;

  --card-bg: #0f172a;
  --card-header-bg: #131d31;
  --card-border: #1e293b;
  --card-body-bg: #0b111e;
  --card-hover-border: #334155;
  --card-hover-shadow: 0 6px 20px -2px rgba(0, 0, 0, 0.4);

  --btn-primary-bg: #f8fafc;
  --btn-primary-text: #090d16;
  --btn-primary-hover: #e2e8f0;
  --btn-secondary-bg: #1e293b;
  --btn-secondary-text: #e2e8f0;
  --btn-secondary-border: #334155;
  --btn-secondary-hover: #293548;

  --badge-bg: #1e293b;
  --badge-text: #94a3b8;
  --badge-border: #334155;

  --table-header-bg: #131d31;
  --table-border: #1e293b;
  --table-hover: #131d31;
  --table-highlight: rgba(56, 189, 248, 0.08);

  --code-bg: #060911;
  --code-text: #f1f5f9;
  --code-header-bg: #0e1524;
  --code-header-border: #1e293b;

  --playground-bg: #0f172a;
  --playground-panel-bg: #131d31;
  --playground-editor-bg: #060911;
  --playground-editor-text: #f8fafc;
  --terminal-bg: #020408;
  --terminal-text: #38bdf8;
  --terminal-border: #1e293b;

  --gauge-bg: #1e293b;
  --kpi-card-bg: #0f172a;
  --callout-bg: rgba(56, 189, 248, 0.06);
  --callout-border: rgba(56, 189, 248, 0.25);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-main);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--trans-normal), color var(--trans-normal);
}

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Top Navigation Header
   -------------------------------------------------------------------------- */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--header-border);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.75rem;
  transition: background-color var(--trans-normal), border-color var(--trans-normal);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
  color: var(--text-main);
}

.brand-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(56, 189, 248, 0.3));
}

.hero-header-flex {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.hero-brand-logo {
  width: 124px;
  height: 124px;
  object-fit: contain;
  flex-shrink: 0;
  filter: drop-shadow(0 12px 28px rgba(56, 189, 248, 0.28));
  transition: transform 0.3s ease;
}

.hero-brand-logo:hover {
  transform: scale(1.05) rotate(-2deg);
}

@media (max-width: 768px) {
  .hero-header-flex {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }
  .hero-brand-logo {
    width: 80px;
    height: 80px;
  }
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--trans-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.4rem;
  border-radius: 4px;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link.active {
  color: var(--accent-blue);
  font-weight: 600;
}

:root[data-theme="dark"] .nav-link.active {
  color: #38bdf8;
}

/* Nav Search Bar */
.nav-search {
  position: relative;
  width: 220px;
}

.nav-search input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.45rem 0.75rem 0.45rem 2.25rem;
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
  transition: all var(--trans-fast);
}

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

.nav-search input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

:root[data-theme="dark"] .nav-search input:focus {
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.nav-search svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--text-dim);
  pointer-events: none;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--trans-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

/* Icon display based on theme */
.sun-icon { display: none; }
.moon-icon { display: block; }

:root[data-theme="dark"] .sun-icon { display: block; }
:root[data-theme="dark"] .moon-icon { display: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  border-radius: 7px;
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--trans-fast);
  border: 1px solid transparent;
  line-height: 1.25;
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: transparent;
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  color: var(--btn-primary-text);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}

.btn-secondary:hover {
  background: var(--btn-secondary-hover);
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   Layout (Sidebar + Main Content)
   -------------------------------------------------------------------------- */
.layout {
  display: flex;
  flex: 1;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Global Custom Scrollbars */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

aside {
  width: 270px;
  border-right: 1px solid var(--sidebar-border);
  background: var(--sidebar-bg);
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 1.5rem 1rem;
  flex-shrink: 0;
  transition: background-color var(--trans-normal), border-color var(--trans-normal);
  scrollbar-width: thin;
  scrollbar-color: var(--border-subtle) transparent;
}

aside::-webkit-scrollbar {
  width: 5px;
}

aside::-webkit-scrollbar-track {
  background: transparent;
}

aside::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 9999px;
}

aside::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

.sidebar-group {
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 700;
  padding: 0 0.6rem 0.45rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.42rem 0.65rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.835rem;
  border-radius: 6px;
  transition: all var(--trans-fast);
  margin-bottom: 2px;
}

.sidebar-link:hover {
  color: var(--text-main);
  background: var(--sidebar-link-hover);
}

.sidebar-link.active {
  color: var(--sidebar-link-active-color);
  background: var(--sidebar-link-active-bg);
  font-weight: 600;
}

.sidebar-link .tag {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  margin-left: auto;
  font-weight: 600;
}

.tag-decl { background: #eff6ff; color: #2563eb; }
.tag-type { background: #ecfdf5; color: #059669; }
.tag-ctrl { background: #f5f3ff; color: #7c3aed; }
.tag-mem  { background: #fff1f2; color: #e11d48; }
.tag-cli  { background: #fffbeb; color: #d97706; }

:root[data-theme="dark"] .tag-decl { background: rgba(56, 189, 248, 0.12); color: #38bdf8; }
:root[data-theme="dark"] .tag-type { background: rgba(52, 211, 153, 0.12); color: #34d399; }
:root[data-theme="dark"] .tag-ctrl { background: rgba(167, 139, 250, 0.12); color: #a78bfa; }
:root[data-theme="dark"] .tag-mem  { background: rgba(251, 113, 133, 0.12); color: #fb7185; }
:root[data-theme="dark"] .tag-cli  { background: rgba(251, 191, 36, 0.12); color: #fbbf24; }

main {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 5rem;
  max-width: 980px;
}

/* --------------------------------------------------------------------------
   Hero & Headers
   -------------------------------------------------------------------------- */
.hero-banner {
  background: var(--hero-bg);
  border: 1px solid var(--hero-border);
  border-radius: 12px;
  padding: 2.25rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.hero-banner::after {
  display: none; /* Removed cheesy AI neon radial glow */
}

h1 {
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 1.5rem;
  line-height: 1.65;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--badge-text);
}

.pill-green { color: var(--accent-green); border-color: rgba(5, 150, 105, 0.25); }
.pill-blue  { color: var(--accent-blue); border-color: rgba(37, 99, 235, 0.25); }
.pill-purple{ color: var(--accent-purple); border-color: rgba(124, 58, 237, 0.25); }

:root[data-theme="dark"] .pill-green { color: #34d399; }
:root[data-theme="dark"] .pill-blue  { color: #60a5fa; }
:root[data-theme="dark"] .pill-purple{ color: #c084fc; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 3.5rem 0 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   Spec & Directive Accordion Cards
   -------------------------------------------------------------------------- */
.spec-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  margin-bottom: 0.85rem;
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
  overflow: hidden;
}

.spec-card:hover {
  border-color: var(--card-hover-border);
  box-shadow: var(--card-hover-shadow);
}

.spec-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.15rem;
  cursor: pointer;
  user-select: none;
  background: var(--card-header-bg);
}

.method-badge {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-service  { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }
.badge-var      { background: #f1f5f9; color: #475569; border: 1px solid #cbd5e1; }
.badge-memory   { background: #fff1f2; color: #be123c; border: 1px solid #fecdd3; }
.badge-type     { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.badge-flow     { background: #f5f3ff; color: #6d28d9; border: 1px solid #ddd6fe; }
.badge-resource { background: #fffbeb; color: #b45309; border: 1px solid #fde68a; }
.badge-cli      { background: #f8fafc; color: #334155; border: 1px solid #cbd5e1; }

:root[data-theme="dark"] .badge-service  { background: rgba(30, 58, 138, 0.4); color: #93c5fd; border: 1px solid #1e3a8a; }
:root[data-theme="dark"] .badge-var      { background: #1e293b; color: #94a3b8; border: 1px solid #334155; }
:root[data-theme="dark"] .badge-memory   { background: rgba(136, 19, 55, 0.35); color: #fda4af; border: 1px solid #881337; }
:root[data-theme="dark"] .badge-type     { background: rgba(6, 78, 59, 0.4); color: #6ee7b7; border: 1px solid #064e3b; }
:root[data-theme="dark"] .badge-flow     { background: rgba(76, 29, 149, 0.4); color: #d8b4fe; border: 1px solid #4c1d95; }
:root[data-theme="dark"] .badge-resource { background: rgba(120, 53, 15, 0.35); color: #fde68a; border: 1px solid #78350f; }
:root[data-theme="dark"] .badge-cli      { background: #1e293b; color: #e2e8f0; border: 1px solid #334155; }

.spec-name {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
}

.spec-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  flex: 1;
  margin-left: 0.25rem;
}

.chevron {
  color: var(--text-dim);
  transition: transform var(--trans-fast);
  flex-shrink: 0;
}

.spec-card.expanded .chevron {
  transform: rotate(180deg);
}

.spec-body {
  display: none;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--card-border);
  background: var(--card-body-bg);
}

.spec-card.expanded .spec-body {
  display: block;
}

/* --------------------------------------------------------------------------
   Tables (Parameter & Data Matrix)
   -------------------------------------------------------------------------- */
.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin: 0.85rem 0 1.25rem;
}

.param-table th, .param-table td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--table-border);
}

.param-table th {
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  background: var(--table-header-bg);
}

.param-name {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-blue);
}

:root[data-theme="dark"] .param-name {
  color: #60a5fa;
}

.param-type {
  font-family: var(--font-mono);
  color: var(--accent-purple);
  font-size: 0.8rem;
}

:root[data-theme="dark"] .param-type {
  color: #a78bfa;
}

/* --------------------------------------------------------------------------
   Code Blocks & Syntax Highlighting
   -------------------------------------------------------------------------- */
.code-box {
  background: var(--code-bg);
  border: 1px solid var(--code-header-border);
  border-radius: 8px;
  overflow: hidden;
  margin: 1rem 0;
  box-shadow: var(--shadow-sm);
}

.code-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.9rem;
  background: var(--code-header-bg);
  border-bottom: 1px solid var(--code-header-border);
  font-size: 0.75rem;
  color: #94a3b8;
  font-family: var(--font-mono);
}

.copy-btn {
  background: transparent;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: all var(--trans-fast);
}

.copy-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

pre code {
  display: block;
  padding: 1.15rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--code-text);
  overflow-x: auto;
}

/* Syntax Highlighting Colors */
.kw { color: #f472b6; font-weight: 600; }
.fn { color: #60a5fa; }
.type { color: #34d399; }
.str { color: #fcd34d; }
.num { color: #fb923c; }
.comment { color: #64748b; font-style: italic; }

/* --------------------------------------------------------------------------
   Interactive Playground
   -------------------------------------------------------------------------- */
.playground-container {
  background: var(--playground-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-md);
}

.playground-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--playground-panel-bg);
  border-bottom: 1px solid var(--border-color);
}

.sample-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--trans-fast);
}

.sample-select:focus {
  border-color: var(--border-focus);
}

.playground-editor {
  width: 100%;
  height: 280px;
  background: var(--playground-editor-bg);
  color: var(--playground-editor-text);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 1.15rem;
  border: none;
  resize: vertical;
  outline: none;
  line-height: 1.65;
}

.playground-output-panel {
  border-top: 1px solid var(--border-color);
  background: var(--playground-panel-bg);
  padding: 1.15rem 1.25rem;
}

.output-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-output {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--terminal-text);
  background: var(--terminal-bg);
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid var(--terminal-border);
  min-height: 120px;
  max-height: 240px;
  overflow-y: auto;
  white-space: pre-wrap;
  line-height: 1.55;
}

.gauge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.gauge-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.75rem 1rem;
}

.gauge-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.gauge-bar-bg {
  height: 8px;
  background: var(--gauge-bg);
  border-radius: 9999px;
  overflow: hidden;
}

.gauge-fill {
  height: 100%;
  border-radius: 9999px;
  transition: width 0.4s ease;
}

.fill-reg-a { background: #0284c7; width: 0%; }
.fill-reg-b { background: #059669; width: 0%; }

/* --------------------------------------------------------------------------
   Benchmark Visualizations & KPIs
   -------------------------------------------------------------------------- */
.bench-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}

.bench-kpi-card {
  background: var(--kpi-card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--trans-fast), border-color var(--trans-fast);
}

.bench-kpi-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-subtle);
}

.bench-kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--kpi-border-color, var(--accent-blue));
}

.kpi-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.kpi-val {
  font-size: 1.85rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.kpi-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.bench-tabs-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.bench-tabs-header {
  display: flex;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
}

.bench-tab-btn {
  padding: 0.75rem 1.25rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  transition: all var(--trans-fast);
}

.bench-tab-btn:hover {
  color: var(--text-main);
}

.bench-tab-btn.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
  background: var(--bg-surface);
}

:root[data-theme="dark"] .bench-tab-btn.active {
  color: #38bdf8;
  border-bottom-color: #38bdf8;
}

.bench-tab-content {
  display: none;
  padding: 1.5rem;
}

.bench-tab-content.active {
  display: block;
}

.chart-container {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chart-bar-row {
  display: grid;
  grid-template-columns: 180px 1fr 130px;
  align-items: center;
  gap: 1rem;
}

.chart-lang-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.chart-lang-badge {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.chart-track {
  background: var(--gauge-bg);
  height: 26px;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
}

.chart-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.75rem;
  color: #ffffff;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
}

.chart-val-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: right;
}

.bar-trulang  { background: #0284c7; }
.bar-rust   { background: #c2410c; }
.bar-go     { background: #0f766e; }
.bar-java   { background: #b91c1c; }
.bar-node   { background: #15803d; }
.bar-python { background: #b45309; }

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: 1rem;
}

.matrix-table th, .matrix-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--table-border);
  text-align: left;
}

.matrix-table th {
  background: var(--table-header-bg);
  color: var(--text-dim);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.matrix-table tr.highlight-row {
  background: var(--table-highlight);
  font-weight: 600;
}

.matrix-table tr.highlight-row td:first-child {
  color: var(--accent-blue);
}

:root[data-theme="dark"] .matrix-table tr.highlight-row td:first-child {
  color: #38bdf8;
}

/* --------------------------------------------------------------------------
   Installation & Setup Flow
   -------------------------------------------------------------------------- */
.install-quick-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-green);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.install-quick-cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--code-bg);
  border: 1px solid var(--code-header-border);
  padding: 0.65rem 1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #38bdf8;
  flex: 1;
  min-width: 280px;
}

.steps-flow {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.step-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.step-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.step-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.ide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.ide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--trans-fast), border-color var(--trans-fast);
}

.ide-card:hover {
  border-color: var(--border-subtle);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Architecture & Comparison Elements
   -------------------------------------------------------------------------- */
.architecture-callout {
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.architecture-diagram {
  background: var(--code-bg);
  border: 1px solid var(--code-header-border);
  border-radius: 8px;
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.55;
  color: #38bdf8;
  overflow-x: auto;
  margin: 1.25rem 0;
}

.comparison-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.comparison-col {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.comparison-col.node-col {
  border-top: 3px solid #16a34a;
}

.comparison-col.trulang-col {
  border-top: 3px solid #0284c7;
}

.comparison-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}

.comparison-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.comparison-col li strong {
  color: var(--text-main);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4rem;
  background: var(--bg-surface);
}

/* --------------------------------------------------------------------------
   FAQ Section & AI Engine Optimization (AIO) Styles
   -------------------------------------------------------------------------- */
.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--trans-normal), box-shadow var(--trans-normal);
}

.faq-item[open] {
  border-color: var(--accent-blue);
  box-shadow: 0 4px 14px -3px rgba(37, 99, 235, 0.12);
}

.faq-question {
  padding: 1.1rem 1.25rem;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  background: var(--card-header-bg);
  transition: background var(--trans-fast);
}

.faq-question:hover {
  background: var(--bg-hover);
  color: var(--accent-blue);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform var(--trans-fast);
  line-height: 1;
  margin-left: 0.75rem;
}

.faq-item[open] .faq-question::after {
  content: "−";
  color: var(--accent-blue);
}

.faq-answer {
  padding: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  background: var(--card-body-bg);
}

.faq-answer p {
  margin-bottom: 0.75rem;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  background: var(--bg-inset);
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   Live Analytics & Telemetry Dashboard Styles
   -------------------------------------------------------------------------- */
.stats-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}

.stats-hero {
  background: var(--hero-bg);
  border: 1px solid var(--hero-border);
  border-radius: 12px;
  padding: 2.25rem 2rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.stats-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #10b981, #3b82f6, #8b5cf6, #06b6d4);
}

.stats-hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.stats-hero h1 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stats-hero p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 780px;
  line-height: 1.6;
}

.stats-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #10b981;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 7px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.5rem;
  position: relative;
  transition: transform var(--trans-normal), box-shadow var(--trans-normal), border-color var(--trans-normal);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-blue);
  box-shadow: var(--card-hover-shadow);
}

.stat-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.stat-icon-badge {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.icon-blue { background: rgba(37, 99, 235, 0.12); color: #2563eb; }
.icon-green { background: rgba(16, 185, 129, 0.12); color: #10b981; }
.icon-purple { background: rgba(139, 92, 246, 0.12); color: #8b5cf6; }
.icon-amber { background: rgba(245, 158, 11, 0.12); color: #f59e0b; }

.stat-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.stat-value {
  font-size: 2.25rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-subtext {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Two Column Layout for breakdowns */
.stats-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.metric-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.75rem;
}

.metric-panel-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.metric-panel-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.breakdown-row {
  margin-bottom: 1.1rem;
}

.breakdown-row:last-child {
  margin-bottom: 0;
}

.breakdown-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
}

.breakdown-name {
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breakdown-pct {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
}

.breakdown-track {
  height: 8px;
  background: var(--bg-inset);
  border-radius: 9999px;
  overflow: hidden;
}

.breakdown-fill {
  height: 100%;
  border-radius: 9999px;
  transition: width 0.8s ease-out;
}

.fill-accent-blue { background: #3b82f6; }
.fill-accent-cyan { background: #06b6d4; }
.fill-accent-purple { background: #8b5cf6; }
.fill-accent-green { background: #10b981; }

.diag-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.diag-table tr {
  border-bottom: 1px solid var(--border-color);
}

.diag-table tr:last-child {
  border-bottom: none;
}

.diag-table td {
  padding: 0.75rem 0.25rem;
}

.diag-key {
  color: var(--text-muted);
  font-weight: 500;
  width: 45%;
}

.diag-val {
  color: var(--text-main);
  font-family: var(--font-mono);
  font-weight: 600;
  text-align: right;
}

.privacy-card {
  background: var(--card-bg);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.privacy-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.privacy-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.privacy-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.nav-link-badge {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  margin-left: 0.25rem;
  vertical-align: middle;
}

.footer-stats-callout {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--trans-fast);
}

.footer-stats-callout:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: var(--bg-hover);
}

/* --------------------------------------------------------------------------
   Responsive Layout
   -------------------------------------------------------------------------- */
@media (max-width: 1120px) {
  .nav-search { width: 170px; }
}

@media (max-width: 980px) {
  .nav-search { display: none; }
}

@media (max-width: 820px) {
  .nav-links { display: none; }
  header { padding: 0 1rem; }
  aside { display: none; }
  main { padding: 1.5rem 1rem; }
  .gauge-grid { grid-template-columns: 1fr; }
  .chart-bar-row { grid-template-columns: 1fr; gap: 0.4rem; }
  .chart-val-label { text-align: left; }
  .comparison-box { grid-template-columns: 1fr; }
  .stats-detail-grid { grid-template-columns: 1fr; gap: 1rem; }
  .stats-hero-top { flex-direction: column; align-items: stretch; }
  .stats-container { padding: 1.25rem 1rem 3rem; }
}