/* ==============================================================================
   TextTool Nest - Design System & Modern Stylesheet
   Light / Dark Mode, Responsive Layout, Glassmorphism, Micro-Interactions
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color Palette - Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #6366f1;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-rgb: 79, 70, 229;

  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --card-shadow-hover: 0 12px 24px -4px rgba(79, 70, 229, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --dropdown-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

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

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Consolas, monospace;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --header-height: 72px;
}

[data-theme="dark"] {
  /* Color Palette - Dark Theme */
  --bg-primary: #0b0f19;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: #131c2e;
  --bg-card-hover: #19253d;
  --bg-input: #0b1120;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-color: #1e293b;
  --border-hover: #334155;
  --border-focus: #818cf8;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  --primary-rgb: 99, 102, 241;

  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --card-shadow-hover: 0 12px 24px -4px rgba(99, 102, 241, 0.15), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --dropdown-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
}

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

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

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

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

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

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

button, input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
}

/* Containers */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.container-wide {
  max-width: 1400px;
}

/* ==============================================================================
   Header & Navigation
   ============================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(var(--bg-secondary), 0.85);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 10px rgba(var(--primary-rgb), 0.3);
  font-size: 1.1rem;
}

.brand-text span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.25rem;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

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

.dropdown-toggle {
  cursor: pointer;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: -20px;
  width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.75rem;
  box-shadow: var(--dropdown-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 100;
}

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
  transform: translateX(3px);
}

.dropdown-item svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Search Trigger Button */
.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card);
}

.search-shortcut-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.theme-toggle-btn .icon-sun {
  display: none;
}
.theme-toggle-btn .icon-moon {
  display: block;
}

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

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.4rem;
}

/* ==============================================================================
   Hero Section
   ============================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% -20%, rgba(var(--primary-rgb), 0.12), transparent 70%);
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(var(--primary-rgb), 0.2);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 60%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

/* Home Live Search Box */
.hero-search-wrapper {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 1.1rem 1.4rem 1.1rem 3.4rem;
  font-size: 1.05rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
  outline: none;
  transition: all var(--transition-fast);
}

.hero-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 12px 30px -5px rgba(var(--primary-rgb), 0.25);
}

.hero-search-icon {
  position: absolute;
  left: 1.3rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.hero-quick-tags {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.quick-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-tag:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* ==============================================================================
   Category Filter Tabs & Tools Grid
   ============================================================================== */
.section-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.25rem;
}

.category-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.category-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.category-tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.category-tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--card-shadow-hover);
}

.tool-card-top {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tool-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

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

.tool-card-info {
  flex: 1;
}

.tool-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-card-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

.tool-card-arrow {
  transition: transform var(--transition-fast);
}

.tool-card:hover .tool-card-arrow {
  transform: translateX(4px);
}

/* No Search Results */
.no-results-box {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3.5rem 1rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
}

/* ==============================================================================
   Tool Execution View & Workspaces
   ============================================================================== */
.tool-view-header {
  padding: 2.5rem 0 1.5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--text-secondary);
}
.breadcrumb a:hover {
  color: var(--primary);
}

.tool-page-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.tool-page-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 800px;
}

/* Main Workspace Box */
.tool-workspace {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.tool-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(var(--primary-rgb), 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

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

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

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

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

.btn-danger {
  background: transparent;
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.2);
}

.btn-danger:hover {
  background: rgba(244, 63, 94, 0.1);
  border-color: var(--accent-rose);
}

.btn-success {
  background: var(--accent-emerald);
  color: #ffffff;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* Tool Input / Output Grid */
.tool-io-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.tool-io-single {
  grid-template-columns: 1fr;
}

.io-panel {
  display: flex;
  flex-direction: column;
}

.io-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.io-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.io-textarea {
  width: 100%;
  min-height: 280px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.925rem;
  line-height: 1.6;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-input);
  color: var(--text-primary);
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.io-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.io-textarea[readonly] {
  background: var(--bg-tertiary);
  cursor: default;
}

/* Options / Controls Panel */
.tool-options-panel {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.option-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.option-group label {
  cursor: pointer;
  user-select: none;
}

.form-control {
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  font-size: 0.925rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

/* ==============================================================================
   Form Elements & Input Controls
   ============================================================================== */
.form-group {
  margin-bottom: 1.35rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.form-input {
  width: 100%;
  padding: 0.8rem 1.1rem;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
  background: var(--bg-card);
}

.form-textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  font-size: 0.95rem;
  font-family: inherit;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  outline: none;
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
  background: var(--bg-card);
}

.form-select {
  width: 100%;
  padding: 0.8rem 1.1rem;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.captcha-box {
  background: var(--bg-tertiary);
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 1.35rem;
}

/* Form Cards & Layouts */
.contact-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 820px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.contact-card, .admin-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 1.5rem;
  transition: all var(--transition-normal);
}

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

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Live Stats Summary Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  text-align: center;
}

.stat-val {
  font-size: 1.4rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Tool Explanations & FAQ Sections */
.tool-content-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.tool-article {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--card-shadow);
}

.tool-article h2, .tool-article h3 {
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}

.tool-article h2:first-child {
  margin-top: 0;
}

.tool-article p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.tool-article ul, .tool-article ol {
  margin: 0 0 1.25rem 1.5rem;
  color: var(--text-secondary);
}

.tool-article li {
  margin-bottom: 0.35rem;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: var(--bg-tertiary);
  border: none;
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-answer {
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Sidebar & Related Tools */
.tool-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--card-shadow);
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  list-style: none;
}

.related-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.related-link:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
  transform: translateX(4px);
}

/* ==============================================================================
   Ad Slots (Clearly Labeled, Non-Deceptive)
   ============================================================================== */
.ad-slot-wrapper {
  margin: 1.5rem auto;
  text-align: center;
}

.ad-slot-placeholder {
  margin: 1.5rem auto;
  padding: 1rem;
  background: var(--bg-tertiary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
  max-width: 100%;
}

.ad-slot-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.ad-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

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

/* ==============================================================================
   Blog & Post Styling
   ============================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

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

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--border-hover);
}

.blog-card-img {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1) 0%, rgba(139, 92, 246, 0.15) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  position: relative;
  overflow: hidden;
}

.blog-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.blog-category-tag {
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.blog-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex: 1;
}

/* Post View */
.post-article {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 3rem;
}

.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.post-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.post-content h2, .post-content h3 {
  color: var(--text-primary);
  font-weight: 800;
  margin: 2rem 0 1rem;
}

.post-content p {
  margin-bottom: 1.25rem;
}

.post-content ul, .post-content ol {
  margin: 0 0 1.5rem 1.5rem;
}

.post-content blockquote {
  border-left: 4px solid var(--primary);
  padding: 0.75rem 1.25rem;
  background: var(--bg-tertiary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
}

.post-content code {
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

.post-content pre {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.post-content th, .post-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.post-content th {
  background: var(--bg-tertiary);
  font-weight: 700;
}

/* ==============================================================================
   Footer
   ============================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  transition: background-color var(--transition-normal);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  margin-top: 0.75rem;
  max-width: 320px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==============================================================================
   Search Modal & Toast System
   ============================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 5rem 1rem 1rem;
}

.modal-backdrop.active {
  display: flex;
}

.search-modal-box {
  width: 100%;
  max-width: 600px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--dropdown-shadow);
  overflow: hidden;
  animation: modalIn 0.15s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-search-header {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  gap: 0.75rem;
}

.modal-search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1.1rem;
  color: var(--text-primary);
  outline: none;
}

.modal-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 0.75rem;
}

.modal-result-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.modal-result-item:hover, .modal-result-item.selected {
  background: var(--bg-tertiary);
  color: var(--primary);
}

/* Toast Alerts */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast-msg {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--text-primary);
  color: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  font-size: 0.9rem;
  font-weight: 600;
  animation: toastIn 0.2s ease-out;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Flash alerts */
.flash-container {
  margin: 1.5rem auto 0;
  max-width: 1240px;
  padding: 0 1.5rem;
}

.flash-alert {
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.925rem;
  font-weight: 600;
}

.flash-success {
  background: rgba(16, 185, 129, 0.15);
  color: #065f46;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

[data-theme="dark"] .flash-success {
  color: #34d399;
}

.flash-error {
  background: rgba(244, 63, 94, 0.15);
  color: #9f1239;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

[data-theme="dark"] .flash-error {
  color: #fb7185;
}

.flash-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: inherit;
}

/* ==============================================================================
   Mobile Drawer & Responsiveness
   ============================================================================== */
@media (max-width: 992px) {
  .nav-menu {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .tool-io-grid {
    grid-template-columns: 1fr;
  }
  .tool-content-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-title {
    font-size: 2.25rem;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .stats-bar {
    grid-template-columns: 1fr 1fr;
  }
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  z-index: 2500;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--dropdown-shadow);
  transition: right var(--transition-normal);
}

.mobile-drawer.active {
  right: 0;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.mobile-drawer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-drawer-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
}