/* ==========================================================================
   ollrite Tools - Main Stylesheet (Modern, Responsive, SEO & AdSense Ready)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Design Tokens (Dark / Light Theme)
   -------------------------------------------------------------------------- */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Courier New', monospace;

  /* Color Palette - Default Dark Mode */
  --bg-body: #090d16;
  --bg-surface: #0f172a;
  --bg-card: #131c31;
  --bg-card-hover: #1a253f;
  --bg-elevated: #1e293b;
  --bg-input: #0a0f1d;
  --bg-accent-soft: rgba(99, 102, 241, 0.12);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #38bdf8;
  --border-subtle: rgba(255, 255, 255, 0.04);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #090d16;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);
  
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  --accent-glow: rgba(6, 182, 212, 0.3);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.35);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1200px;
  --header-height: 72px;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-elevated: #f8fafc;
  --bg-input: #ffffff;
  --bg-accent-soft: rgba(79, 70, 229, 0.08);

  --border-color: #e2e8f0;
  --border-focus: #2563eb;
  --border-subtle: #f1f5f9;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --text-inverse: #ffffff;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-glow: rgba(79, 70, 229, 0.2);

  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.2);

  --success: #059669;
  --success-bg: rgba(5, 150, 105, 0.1);
  --danger: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.1);
  --warning: #d97706;
  --warning-bg: rgba(217, 119, 6, 0.1);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.09);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

/* Accessible focus styles */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

/* Accessibility skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--primary);
  color: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* --------------------------------------------------------------------------
   Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-narrow {
  max-width: 860px;
}

.main-content {
  flex: 1 0 auto;
  padding-bottom: 60px;
}

/* --------------------------------------------------------------------------
   Header & Sticky Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="light"] .site-header {
  background-color: rgba(255, 255, 255, 0.88);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-logo:hover {
  color: var(--text-main);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background-color: var(--bg-card-hover);
}

/* Dropdown Menu for Tools */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 290px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 8px;
  box-shadow: var(--shadow-lg);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 110;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-item a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-dropdown-item a:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.nav-dropdown-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
  flex-shrink: 0;
}

/* Nav Actions (Theme toggle & Mobile Toggle) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

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

.theme-icon-sun, .theme-icon-moon {
  width: 20px;
  height: 20px;
}

[data-theme="light"] .theme-icon-moon { display: block; }
[data-theme="light"] .theme-icon-sun { display: none; }
:root:not([data-theme="light"]) .theme-icon-moon { display: none; }
:root:not([data-theme="light"]) .theme-icon-sun { display: block; }

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --------------------------------------------------------------------------
   Hero Section (with 3D canvas container)
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding: 70px 0 60px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.7;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-accent-soft);
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-main);
}

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-features-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 24px;
  list-style: none;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-feature-item svg {
  color: var(--success);
  width: 18px;
  height: 18px;
}

/* --------------------------------------------------------------------------
   AdSense Ad Slots
   -------------------------------------------------------------------------- */
.ad-slot-wrapper {
  margin: 32px 0;
  width: 100%;
}

.ad-slot {
  position: relative;
  width: 100%;
  min-height: 90px;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 12px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.ad-slot:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .ad-slot:hover {
  border-color: #cbd5e1;
}

.ad-slot-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.ad-slot-placeholder-text {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.ad-slot-rectangle {
  min-height: 250px;
}

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Tool Cards Grid (Homepage & Directory)
   -------------------------------------------------------------------------- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.tool-card {
  position: relative;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  text-decoration: none;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tool-card:hover {
  transform: translateY(-5px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow-lg), 0 0 20px -5px var(--primary-glow);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--accent);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tool-card:hover .tool-icon-wrapper {
  background-color: var(--primary);
  color: #ffffff;
}

.tool-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.tool-card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 20px;
  flex-grow: 1;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

.tool-card:hover .tool-card-footer {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   Tool Page Workspace & Interfaces
   -------------------------------------------------------------------------- */
.tool-page-header {
  padding: 40px 0 24px;
  text-align: center;
}

.tool-page-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.tool-page-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--text-muted);
}

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

.breadcrumb-separator {
  color: var(--text-dim);
}

.breadcrumb-current {
  color: var(--text-main);
  font-weight: 600;
}

/* Main Tool Container */
.tool-workspace {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 28px;
  margin-bottom: 40px;
  position: relative;
}

.tool-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.tool-toolbar-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 14px var(--primary-glow);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--text-main);
  background-color: var(--bg-accent-soft);
}

.btn-danger {
  background-color: transparent;
  border: 1px solid var(--danger-bg);
  color: var(--danger);
}

.btn-danger:hover {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
}

/* Form Controls & Inputs */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.tool-textarea {
  width: 100%;
  min-height: 220px;
  padding: 16px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tool-textarea:focus {
  border-color: var(--border-focus);
  outline: none;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-input, .form-select {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--border-focus);
  outline: none;
}

/* Checkbox & Switch Controls */
.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-muted);
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* Stats Badges & Counters */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.stat-box {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Density Table */
.density-table-wrapper {
  margin-top: 24px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.density-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.density-table th {
  background-color: var(--bg-elevated);
  padding: 10px 14px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.density-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-main);
}

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

.density-table tr:hover {
  background-color: var(--bg-card-hover);
}

/* Diff Viewer Component */
.diff-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

.diff-output {
  margin-top: 20px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  max-height: 500px;
  overflow: auto;
}

.diff-line {
  display: flex;
  padding: 2px 8px;
  border-radius: 3px;
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-line-added {
  background-color: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.diff-line-removed {
  background-color: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

.diff-line-unchanged {
  color: var(--text-muted);
}

.diff-indicator {
  display: inline-block;
  width: 20px;
  font-weight: bold;
  user-select: none;
}

/* ASCII Art Output */
.ascii-output-box {
  width: 100%;
  background-color: #030712;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.25;
  overflow-x: auto;
  white-space: pre;
  tab-size: 4;
  margin-top: 16px;
  min-height: 140px;
}

/* Palindrome Result Box */
.palindrome-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 16px;
}

.palindrome-true {
  background-color: var(--success-bg);
  border: 1px solid var(--success);
  color: #34d399;
}

.palindrome-false {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger);
  color: #f87171;
}

/* --------------------------------------------------------------------------
   Editorial Content & SEO Guide Sections (500+ words formatting)
   -------------------------------------------------------------------------- */
.content-section {
  padding: 40px 0;
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-main);
}

.article-body h2 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: 48px;
  margin-bottom: 18px;
  color: var(--text-main);
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.article-body p {
  margin-bottom: 22px;
  color: var(--text-muted);
}

.article-body strong {
  color: var(--text-main);
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--text-muted);
}

.article-body li {
  margin-bottom: 8px;
}

.callout-box {
  background-color: var(--bg-card);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 30px 0;
  box-shadow: var(--shadow-sm);
}

.callout-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.callout-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* FAQ Accordion Section */
.faq-section {
  max-width: 820px;
  margin: 40px auto 0;
}

.faq-title {
  font-size: 1.8rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 28px;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .faq-item:hover {
  border-color: #cbd5e1;
}

.faq-question {
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--accent);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* Related Tools Grid */
.related-tools-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Blog Listing & Single Post Styles
   -------------------------------------------------------------------------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.blog-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.blog-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--bg-elevated);
}

.blog-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}

.blog-card-title a {
  color: inherit;
}

.blog-card-title a:hover {
  color: var(--primary);
}

.blog-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* Table of Contents */
.toc-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
}

.toc-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 14px;
  color: var(--text-main);
}

.toc-list {
  list-style: none;
  padding-left: 0;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

/* --------------------------------------------------------------------------
   About & Contact Us Pages
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 32px;
}

.contact-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

/* --------------------------------------------------------------------------
   Cookie Notice Banner
   -------------------------------------------------------------------------- */
.cookie-banner {
  position: fixed;
  bottom: 20px;
  left: 20px;
  right: 20px;
  max-width: 680px;
  margin: 0 auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: slideUp 0.4s ease-out forwards;
}

@keyframes slideUp {
  from {
    transform: translateY(100px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.cookie-content {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.cookie-content a {
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* --------------------------------------------------------------------------
   Toast Notification
   -------------------------------------------------------------------------- */
.toast-notice {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background-color: var(--text-main);
  color: var(--text-inverse);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
}

.toast-notice.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  margin-top: auto;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  margin-top: 14px;
  max-width: 320px;
  font-size: 0.88rem;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.84rem;
}

/* --------------------------------------------------------------------------
   Scroll Reveal Animations
   -------------------------------------------------------------------------- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints & Mobile Optimization
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 12px;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    border-top: 1px solid var(--border-color);
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: 14px;
    background-color: transparent;
    width: 100%;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .diff-container, .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .cookie-banner {
    left: 12px;
    right: 12px;
    bottom: 12px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .tool-workspace {
    padding: 18px;
  }

  .tool-toolbar-group {
    width: 100%;
  }

  .tool-toolbar-group .btn {
    flex: 1 1 auto;
  }
}

/* Respect Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}