:root {
  /* Light Mode Colors */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --secondary: #7C3AED;
  --secondary-hover: #6D28D9;
  --accent: #10B981;
  --accent-light: rgba(16, 185, 129, 0.1);
  --warning: #F59E0B;
  --warning-light: rgba(245, 158, 11, 0.1);
  --danger: #EF4444;
  --danger-light: rgba(239, 68, 68, 0.1);
  --bg-primary: #F8FAFC;
  --bg-secondary: #F1F5F9;
  --card-bg: #FFFFFF;
  --border-color: #E2E8F0;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --header-bg: rgba(255, 255, 255, 0.85);
  --header-shadow: rgba(17, 24, 39, 0.05);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1.25rem;
  
  /* Settings */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Poppins', sans-serif;
}

[data-theme="dark"] {
  /* Dark Mode Colors */
  --primary: #3B82F6;
  --primary-hover: #2563EB;
  --secondary: #8B5CF6;
  --secondary-hover: #7C3AED;
  --accent: #10B981;
  --accent-light: rgba(16, 185, 129, 0.15);
  --warning: #F59E0B;
  --warning-light: rgba(245, 158, 11, 0.15);
  --danger: #EF4444;
  --danger-light: rgba(239, 68, 68, 0.15);
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --card-bg: #1E293B;
  --border-color: #334155;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-light: #64748B;
  --header-bg: rgba(15, 23, 42, 0.85);
  --header-shadow: rgba(0, 0, 0, 0.3);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.45), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.35);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 1rem;
  transition: var(--transition);
  overflow-x: hidden;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

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

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

ul {
  list-style: none;
}

/* ==========================================================================
   LAYOUT CONTAINERS
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  padding-bottom: 4rem;
}

.two-col-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 1024px) {
  .two-col-layout {
    grid-template-columns: 65% 35%;
  }
}

.left-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-width: 0;
}

.right-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-width: 0;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

header.scrolled {
  box-shadow: var(--header-shadow);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.logo-icon-svg {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--primary);
}

.logo-highlight {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Nav Menu styles */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  position: relative;
  display: block;
  padding: 0.5rem 1rem;
  margin: 0 0.15rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.925rem;
  text-decoration: none;
  border-radius: 50px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover {
  background-color: rgba(37, 99, 235, 0.05);
  color: var(--primary);
}

.nav-link.active {
  background-color: rgba(37, 99, 235, 0.09);
  color: var(--primary);
}

[data-theme="dark"] .nav-link:hover {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--primary);
}

[data-theme="dark"] .nav-link.active {
  background-color: rgba(59, 130, 246, 0.18);
  color: var(--primary);
}

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

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 280px;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem 0;
  display: none;
  flex-direction: column;
  z-index: 100;
}

.dropdown:hover .dropdown-menu {
  display: flex;
}

.dropdown-link {
  padding: 0.65rem 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
}

.dropdown-link:hover, .dropdown-link.active {
  background-color: var(--bg-secondary);
  color: var(--primary);
}

/* Scroll progress bar */
.progress-bar-container {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

/* Hamburger menu button */
.hamburger {
  display: none;
  position: relative;
  width: 1.5rem;
  height: 1.1rem;
  background: transparent;
  border: none;
  cursor: pointer;
}

.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, top 0.3s ease;
}

.hamburger span:nth-child(1) {
  top: 0;
}

.hamburger span:nth-child(2) {
  top: calc(50% - 1px);
}

.hamburger span:nth-child(3) {
  top: calc(100% - 2px);
}

.hamburger.active span:nth-child(1) {
  top: calc(50% - 1px);
  transform: rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.hamburger.active span:nth-child(3) {
  top: calc(50% - 1px);
  transform: rotate(-45deg);
}


/* Controls header widgets like dark mode toggle */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Dark mode switch styling */
.theme-toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.theme-toggle-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

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

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

[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}

/* Responsive navigation */
@media (max-width: 1023px) {
  .logo {
    order: 1;
  }
  
  nav {
    order: 2;
  }
  
  .header-actions {
    order: 3;
    margin-left: auto;
    margin-right: 1.25rem;
  }
  
  .hamburger {
    display: flex;
    order: 4;
  }
  
  .nav-menu {
    position: absolute;
    top: 4.5rem;
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.5rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
  }
  
  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .dropdown-menu {
    position: static;
    width: 100%;
    border: none;
    box-shadow: none;
    background-color: var(--bg-secondary);
    padding-left: 1rem;
    margin-top: 0.25rem;
    display: none;
  }
  
  .dropdown.active .dropdown-menu {
    display: flex;
  }
}

/* ==========================================================================
   HERO SECTION & HEADINGS
   ========================================================================== */

.hero-section {
  position: relative;
  padding: 4rem 0 3rem 0;
  background: radial-gradient(circle at top right, rgba(124, 58, 237, 0.05), transparent 40%),
              radial-gradient(circle at bottom left, rgba(37, 99, 235, 0.05), transparent 40%);
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem auto;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-top: 1rem;
}

/* ==========================================================================
   CALCULATOR UI
   ========================================================================== */

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

.calculator-header {
  margin-bottom: 2rem;
}

.calculator-header h1, .calculator-header h2 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.calculator-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .calculator-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Tooltip UI */
.info-tooltip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 50%;
  font-size: 0.7rem;
  cursor: help;
}

.info-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  background-color: #1E293B;
  color: #FFFFFF;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-body);
  width: 200px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 200;
}

.info-tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

.input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon-left {
  position: absolute;
  left: 1rem;
  color: var(--text-light);
  font-weight: 500;
  pointer-events: none;
}

.calculator-input {
  width: 100%;
  height: 3rem;
  padding: 0.5rem 1rem;
  border: 1.5px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
}

.calculator-input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--card-bg);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.input-icon-padding {
  padding-left: 2.25rem;
}

.error-message {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 0.25rem;
  display: none;
}

/* Currency selector & select inputs */
.currency-selector-group {
  display: flex;
  gap: 0.5rem;
}

.select-wrapper {
  position: relative;
  width: 100%;
}

.select-wrapper::after {
  content: '▼';
  font-size: 0.7rem;
  color: var(--text-secondary);
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

.calculator-select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 3rem;
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  border: 1.5px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.calculator-select:focus {
  outline: none;
  border-color: var(--primary);
}

/* Button Controls */
.calculator-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 3.25rem;
  padding: 0.5rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF;
  flex-grow: 2;
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  flex-grow: 1;
}

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

/* Results Section styling */
.results-panel {
  margin-top: 2rem;
  border-top: 1px dashed var(--border-color);
  padding-top: 2rem;
  display: none; /* Shown dynamically */
  flex-direction: column;
  gap: 1.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .results-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.result-card {
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  display: none;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

/* Color coding rules */
.result-card.good {
  border-color: rgba(16, 185, 129, 0.3);
  background-color: var(--accent-light);
}

.result-card.average {
  border-color: rgba(245, 158, 11, 0.3);
  background-color: var(--warning-light);
}

.result-card.high {
  border-color: rgba(239, 68, 68, 0.3);
  background-color: var(--danger-light);
}

.result-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.result-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.result-value {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.result-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.result-copy-btn:hover {
  color: var(--primary);
  background-color: var(--bg-secondary);
}

.result-copy-btn svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.results-footer-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.btn-small {
  height: 2.5rem;
  padding: 0 1rem;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-small svg {
  width: 0.95rem;
  height: 0.95rem;
  fill: currentColor;
}

/* ==========================================================================
   AD CONTAINERS (Google AdSense Ready)
   ========================================================================== */

.ad-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1.5rem 0;
  padding: 0.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-align: center;
}

.ad-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.ad-horizontal {
  width: 100%;
  min-height: 90px;
  justify-content: center;
}

.ad-skyscraper {
  width: 100%;
  min-height: 600px;
  justify-content: flex-start;
}

.ad-square {
  width: 100%;
  min-height: 250px;
  justify-content: center;
}

/* ==========================================================================
   SEO & CONTENT BLOCKS
   ========================================================================== */

.seo-content-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
  .seo-content-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .seo-content-card {
    padding: 1.25rem 1rem;
  }
}

.seo-content-card h2 {
  font-size: 1.5rem;
  border-bottom: 2.5px solid var(--primary);
  display: inline-block;
  padding-bottom: 0.35rem;
  margin-bottom: 1.5rem;
  margin-top: 1rem;
}

.seo-content-card h2:first-of-type {
  margin-top: 0;
}

.seo-content-card h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.75rem 0;
}

.seo-content-card p,
.article-body p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  text-align: justify;
}

.seo-content-card ul, .seo-content-card ol,
.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

.seo-content-card li,
.article-body li {
  margin-bottom: 0.5rem;
  text-align: justify;
}

/* Formula Box Design */
.formula-box {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}

.formula-display {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

@media (max-width: 560px) {
  .formula-display {
    font-size: 1.1rem;
  }
  .formula-box {
    padding: 1rem;
    margin: 1rem 0;
  }
}

.formula-legend {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Tables styling */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

th, td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  font-family: var(--font-heading);
}

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

tr:hover td {
  background-color: var(--bg-secondary);
}

/* Features grid with icons */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.feature-item {
  display: flex;
  gap: 1rem;
}

.feature-icon-wrapper {
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  background-color: var(--bg-secondary);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon-wrapper svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.feature-text h4 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.feature-text p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Real World Case Studies cards */
.case-studies-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

@media (min-width: 768px) {
  .case-studies-container {
    grid-template-columns: repeat(3, 1fr);
  }
}

.case-study-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: var(--transition);
}

.case-study-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.case-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  background-color: var(--primary);
  color: #FFFFFF;
}

.case-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

.case-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.case-metrics {
  margin-top: auto;
  border-top: 1px dashed var(--border-color);
  padding-top: 0.75rem;
  font-size: 0.85rem;
}

/* FAQ Accordion Styling */
.faq-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

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

.faq-question-btn {
  width: 100%;
  padding: 1.1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  border: none;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.975rem;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.faq-icon-arrow {
  width: 1rem;
  height: 1rem;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}

.faq-item.active {
  border-color: var(--primary);
  background-color: var(--card-bg);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer-block {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.faq-answer-inner {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.925rem;
}

/* Interactive Example Calculator Widget inside examples/homepage */
.interactive-calc-wrapper {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

/* breadcrumbs */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.breadcrumbs-separator {
  color: var(--text-light);
}

.breadcrumbs-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ==========================================================================
   OTHER CALCULATORS LIST
   ========================================================================== */

.other-calcs-section {
  padding: 3rem 0;
  background-color: var(--bg-secondary);
}

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.section-title p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.calcs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .calcs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .calcs-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.calc-card-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.calc-card-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.calc-card-icon {
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--bg-secondary);
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.calc-card-icon svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.calc-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

.calc-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.calc-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   BLOG LAYOUTS & CARDS
   ========================================================================== */

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 640px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.blog-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition);
}

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

.blog-thumbnail-wrapper {
  position: relative;
  width: 100%;
  height: 12rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.blog-thumbnail-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  text-align: center;
  padding: 1.5rem;
  color: var(--primary);
}

.blog-category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--card-bg);
  color: var(--secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.blog-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 0.75rem;
}

.blog-card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.4;
  color: var(--text-primary);
}

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

.blog-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-meta-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.blog-author-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-readmore-btn {
  font-weight: 600;
  color: var(--primary);
}

/* Blog Filter Tabs & Search */
.blog-filters-row {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .blog-filters-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.blog-search-box {
  position: relative;
  width: 100%;
  max-width: 400px;
}

.search-input {
  width: 100%;
  height: 2.75rem;
  padding: 0.5rem 1rem;
  border: 1.5px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
}

.filter-tabs {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.filter-tab {
  white-space: nowrap;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.45rem 1rem;
  border-radius: 20px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.filter-tab:hover, .filter-tab.active {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
}

/* Blog Post Detail Styling */
.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.post-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
}

.post-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.post-meta-item svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.post-hero-image {
  width: 100%;
  height: 25rem;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2) 0%, rgba(124, 58, 237, 0.2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-md);
  text-align: center;
  padding: 2rem;
}

.post-hero-image-label {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

/* Sticky Table of Contents on Blog Post */
.toc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.toc-card h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.toc-list-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-list-item-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toc-list-item-link:hover, .toc-list-item-link.active {
  color: var(--primary);
  font-weight: 500;
}

.sticky-sidebar-toc {
  position: sticky;
  top: 6rem;
}

/* Related posts styling */
.related-posts-block {
  margin-top: 3rem;
  border-top: 1px solid var(--border-color);
  padding-top: 3rem;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media (min-width: 640px) {
  .related-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.related-post-card-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: var(--transition);
}

.related-post-card-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.related-post-title-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.related-post-excerpt-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-post-pub-date {
  font-size: 0.7rem;
  color: var(--text-light);
}

/* ==========================================================================
   ABOUT US, CONTACT US, PRIVACY, DISCLAIMER & HOW-TO-USE
   ========================================================================== */

/* Team Cards layout */
.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

@media (min-width: 640px) {
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.team-member-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
}

.team-avatar-placeholder {
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 1rem auto;
}

.team-name {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.team-role {
  font-size: 0.8rem;
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* Trust Badges in About Us page */
.trust-badges-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

@media (min-width: 768px) {
  .trust-badges-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.trust-badge-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.trust-badge-icon {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.trust-badge-title {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Contact forms layout */
.contact-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .contact-container {
    grid-template-columns: 60% 40%;
  }
}

.contact-cards-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-card-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.contact-card-icon {
  font-size: 1.5rem;
  color: var(--secondary);
}

.contact-card-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.contact-card-value {
  font-weight: 600;
}

.text-area-input {
  height: 8rem;
  resize: vertical;
}

/* How to use step cards */
.steps-vertical-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.step-horizontal-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
}

.step-badge-number {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background-color: var(--primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
}

.step-card-text h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.step-card-text p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.video-placeholder-container {
  width: 100%;
  aspect-ratio: 16/9;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 1.5rem 0;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.video-placeholder-container svg {
  width: 3rem;
  height: 3rem;
  fill: currentColor;
}

/* ==========================================================================
   FOOTER (Identical across pages — no ads)
   ========================================================================== */

footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4.5rem 0 2rem 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 640px) {
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-top-grid {
    grid-template-columns: 2.5fr 1.5fr 1.5fr 2.5fr;
  }
}

.footer-col-item {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-col-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.footer-brand-p {
  line-height: 1.6;
}

.social-links-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.social-circle-link {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.social-circle-link:hover {
  background-color: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

.social-circle-link svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links-list a {
  color: var(--text-secondary);
}

.footer-links-list a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-blog-post-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.footer-blog-post-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.footer-blog-post-title {
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.footer-blog-post-date {
  font-size: 0.7rem;
  color: var(--text-light);
}

.footer-bottom-bar {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom-bar {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-bottom-links {
  display: flex;
  gap: 1.25rem;
}

.footer-bottom-links a {
  color: var(--text-secondary);
}

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

/* ==========================================================================
   TOAST SYSTEM STYLES
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: #1E293B;
  color: #FFFFFF;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: toastFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transition: opacity 0.3s, transform 0.3s;
}

.toast.removing {
  opacity: 0;
  transform: translateY(-20px);
}

.toast-icon-check {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--accent);
}

@keyframes toastFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Heading Anchor scroll offsets for sticky header */
h1[id], h2[id], h3[id], h4[id], [id] {
  scroll-margin-top: 5.5rem;
}

/* Floating Shortcut Button */
.floating-calc-btn {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: 50px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.floating-calc-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  stroke: currentColor;
  fill: none;
}

.floating-calc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
  color: #ffffff;
}

/* Responsive adjustment for floating button on mobile */
@media (max-width: 768px) {
  .floating-calc-btn {
    bottom: 1.5rem;
    left: 1.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }
}

/* Stretched Link Utility (makes entire parent card clickable) */
.stretched-link::after {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1;
  content: "";
}

/* Responsive layout updates for mobile & tablet */
@media (max-width: 768px) {
  .ad-skyscraper {
    min-height: 250px !important;
    height: auto !important;
  }
  .calculator-tabs-wrapper {
    display: flex !important;
    gap: 0.35rem !important;
  }
  .calculator-tabs-wrapper a {
    flex: 1 1 calc(50% - 0.35rem) !important;
    justify-content: center !important;
    font-size: 0.8rem !important;
    padding: 0.5rem 0.75rem !important;
    white-space: nowrap;
  }
}

/* === DYNAMIC MULTI-TAB CALCULATOR & CHEAT SHEET STYLES === */
:root {
  --ink: var(--text-primary);
  --mid: var(--text-secondary);
  --muted: var(--text-light);
  --ghost: var(--text-light);
  --ac: var(--primary);
  --am: var(--secondary);
  --ru: var(--primary-hover);
  --bg: var(--bg-primary);
  --bg2: var(--bg-secondary);
  --su: var(--card-bg);
  --br: var(--border-color);
  --br2: var(--border-color);
  --wm: var(--bg-secondary);
  --wm2: var(--bg-secondary);
  
  --s1: 0 1px 4px rgba(0,0,0,.05);
  --s2: 0 3px 12px rgba(0,0,0,.07);
  --s3: 0 8px 32px rgba(0,0,0,.10);
  --s4: 0 20px 60px rgba(0,0,0,.13);
  --rs: var(--radius-sm);
  --rm: var(--radius-md);
  --rl: var(--radius-lg);
  --rx: var(--radius-xl);
  --ez: cubic-bezier(.22,.68,0,1.2);
}

/* === KEYFRAME ANIMATIONS === */
@keyframes fUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: none; }
}
@keyframes rpl {
  to { transform: scale(5); opacity: 0; }
}
@keyframes resIn {
  from { opacity: 0; transform: scale(.97) translateY(8px); }
  to { opacity: 1; transform: none; }
}
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}
@keyframes pg {
  0%, 100% { box-shadow: 0 4px 14px rgba(37,99,235,.25); }
  50% { box-shadow: 0 4px 20px rgba(37,99,235,.45), 0 0 0 5px rgba(37,99,235,.07); }
}
@keyframes cntIn {
  from { opacity: 0; transform: translateY(12px) scale(.93); }
  to { opacity: 1; transform: none; }
}

/* ==========================================================================
   CALCULATOR ZONE (SCOPED UNDER .cz)
   ========================================================================== */
.cz {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
  padding: 64px 24px 80px;
  contain: layout;
  border-radius: var(--radius-xl);
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}
.cz::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.02'/%3E%3C/svg%3E");
  opacity: .5;
  pointer-events: none;
  z-index: 0;
}
.cz .cg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--border-color) 1px, transparent 1px), linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}
.cz .g1 {
  position: absolute;
  top: -80px;
  left: -60px;
  width: 460px;
  height: 360px;
  background: radial-gradient(ellipse, rgba(37,99,235,.07) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}
.cz .g2 {
  position: absolute;
  bottom: -80px;
  right: -60px;
  width: 420px;
  height: 340px;
  background: radial-gradient(ellipse, rgba(139,92,246,.07) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}
.cz .ci {
  max-width: 1120px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.cz .cew {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
  animation: fUp .6s .05s var(--ez) both;
}
.cz .cew::before, .cz .cew::after {
  content: '';
  height: 1px;
  background: var(--primary);
  opacity: .35;
  width: 20px;
}
.cz .ct {
  font-family: var(--font-heading), 'Playfair Display', serif;
  font-size: clamp(1.8rem, 4.5vw, 2.5rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -.025em;
  margin-bottom: 36px;
  text-align: center;
  animation: fUp .65s .15s var(--ez) both;
}
.cz .ct em {
  font-style: italic;
  color: var(--primary);
}
.cz .cc {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--rx);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  animation: fUp .7s .25s var(--ez) both;
}
.cz .tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}
.cz .tab {
  padding: 18px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  transition: color .22s, background .22s;
  position: relative;
}
.cz .tab .ti {
  font-size: 18px;
  transition: transform .28s var(--ez);
}
.cz .tab:hover:not(.act) .ti {
  transform: scale(1.18);
}
.cz .tab:hover:not(.act) {
  color: var(--primary);
  background: var(--bg-primary);
}
.cz .tab.act {
  color: var(--primary);
  background: var(--card-bg);
}
.cz .tab.act::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 15%;
  right: 15%;
  height: 3px;
  background: var(--primary);
  border-radius: 3px 3px 0 0;
}
.cz .cb {
  padding: 38px 38px 34px;
}
.cz .pn {
  display: none;
}
.cz .pn.act {
  display: block;
  animation: fUp .3s var(--ez);
}
.cz .pt {
  font-family: var(--font-heading), 'Playfair Display', serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  text-align: left;
}
.cz .pd {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 26px;
  text-align: left;
}
.cz .ig {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
.cz .fi {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cz .lb {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-align: left;
}
.cz .iw {
  position: relative;
}
.cz .px {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  pointer-events: none;
  z-index: 1;
}
.cz .sx {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  pointer-events: none;
  z-index: 1;
}
.cz .inp {
  width: 100%;
  height: 52px;
  background: var(--bg-primary);
  border: 1.5px solid var(--border-color);
  border-radius: var(--rs);
  font-family: var(--font-body), sans-serif;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  outline: none;
  -moz-appearance: textfield;
  transition: border-color .2s, background .2s, box-shadow .2s, transform .12s;
  box-sizing: border-box;
}
.cz .inp::-webkit-inner-spin-button, .cz .inp::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
.cz .inp.pp {
  padding: 0 14px 0 34px;
}
.cz .inp.sp {
  padding: 0 38px 0 14px;
}
.cz .inp.np {
  padding: 0 14px;
}
.cz .inp::placeholder {
  color: var(--text-light);
  opacity: 0.6;
}
.cz .inp:focus {
  border-color: var(--primary);
  background: var(--card-bg);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
  transform: translateY(-1px);
}
.cz .sr {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}
.cz .sr input[type=range] {
  -webkit-appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 99px;
  background: var(--border-color);
  outline: none;
  cursor: pointer;
  margin: 0;
  padding: 0;
  border: none;
}
.cz .sr input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 2px 6px rgba(37,99,235,.3);
  cursor: grab;
  transition: transform .15s;
}
.cz .sr input[type=range]::-webkit-slider-thumb:active {
  transform: scale(1.25);
  cursor: grabbing;
}
.cz .sv {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  min-width: 60px;
  text-align: right;
  font-family: 'DM Mono', monospace;
}
.cz .btn-cz {
  width: 100%;
  height: 54px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border: none;
  border-radius: var(--rm);
  color: #fff;
  font-family: var(--font-body), sans-serif;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .05em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(37,99,235,.25);
  transition: transform .14s, box-shadow .18s;
  animation: pg 2.5s 2s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.cz .btn-cz::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.1) 0%, transparent 55%);
}
.cz .btn-cz::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 38%, rgba(255,255,255,.15) 50%, transparent 62%);
  background-size: 200% auto;
  opacity: 0;
  transition: opacity .28s;
}
.cz .btn-cz:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,.4);
  animation: none;
}
.cz .btn-cz:hover::after {
  opacity: 1;
  animation: shimmer .75s ease;
}
.cz .btn-cz:active {
  transform: none;
}
.cz .rpl {
  position: absolute;
  border-radius: 50%;
  background: rgba(37,99,235,.15);
  transform: scale(0);
  animation: rpl .5s ease-out forwards;
  pointer-events: none;
}
.cz .res {
  display: none;
  margin-top: 22px;
  border-radius: var(--rm);
  background: linear-gradient(135deg, rgba(37,99,235,.05) 0%, rgba(124,58,237,.02) 100%);
  border: 1px solid rgba(37,99,235,.12);
  padding: 22px 26px;
  animation: resIn .42s var(--ez) forwards;
  position: relative;
  overflow: hidden;
  text-align: left;
}
.cz .res::before {
  content: '';
  position: absolute;
  top: -18px;
  right: -18px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(37,99,235,.06) 0%, transparent 65%);
}
.cz .res.on {
  display: block;
}
.cz .rl {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.cz .rl::before {
  content: '';
  width: 14px;
  height: 1.5px;
  background: var(--primary);
  opacity: .6;
}
.cz .rv2 {
  font-family: var(--font-heading), 'Playfair Display', serif;
  font-size: clamp(1.9rem, 5.5vw, 2.8rem);
  color: var(--text-primary);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 8px;
  animation: cntIn .38s var(--ez);
}
.cz .ru2 {
  font-family: var(--font-body), sans-serif;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 400;
}
.cz .rb {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.62;
}
.cz .rb strong {
  color: var(--text-primary);
}
.cz .bg {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 11px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
}
.cz .bg-g {
  background: rgba(16,185,129,.15);
  color: #10b981;
  border: 1px solid rgba(16,185,129,.25);
}
.cz .bg-a {
  background: rgba(245,158,11,.15);
  color: #d97706;
  border: 1px solid rgba(245,158,11,.25);
}
.cz .bg-h {
  background: rgba(239,68,68,.15);
  color: #ef4444;
  border: 1px solid rgba(239,68,68,.25);
}
.cz .err {
  display: none;
  color: var(--danger);
  font-size: 12.5px;
  margin-top: 6px;
  text-align: left;
}
.cz .err.on {
  display: block;
}
.cz .rst {
  display: block;
  text-align: center;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-light);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .18s;
}
.cz .rst:hover {
  color: var(--primary);
}
@media(max-width:560px){
  .container {
    padding: 0 1rem;
  }
  .cz .ig {
    grid-template-columns: 1fr;
  }
  .cz .cb {
    padding: 24px 20px;
  }
  .cz {
    padding: 48px 16px 64px;
  }
  .cz .tab .tl {
    display: none;
  }
  .cz .tab .ti {
    font-size: 21px;
  }
}

.cz-side-ad {
  transition: opacity 0.3s;
}
@media (max-width: 1220px) {
  .cz-side-ad {
    display: none !important;
  }
}

/* ==========================================================================
   METRICS CHEAT SHEET SIDEBAR REDESIGN
   ========================================================================== */
.cheat-sheet-widget {
  background: var(--card-bg) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-lg) !important;
  padding: 1.5rem !important;
  box-shadow: var(--shadow-sm) !important;
  transition: transform 0.3s var(--ez), box-shadow 0.3s var(--ez) !important;
  margin-top: 1.5rem;
}
.cheat-sheet-widget:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md) !important;
}
.cheat-sheet-widget h3 {
  font-size: 1.15rem !important;
  font-weight: 700 !important;
  margin-bottom: 1.25rem !important;
  border-bottom: 2px solid var(--border-color) !important;
  padding-bottom: 0.5rem !important;
  color: var(--text-primary) !important;
  font-family: var(--font-heading) !important;
  text-align: left;
}
.cheat-sheet-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cheat-sheet-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  text-align: left;
}
.cheat-sheet-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
  transition: background 0.22s;
}
.cheat-sheet-item:hover {
  transform: translateX(4px);
  border-color: var(--border-color);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
}
.cheat-sheet-item.cpm-item:hover::before { background: var(--primary); }
.cheat-sheet-item.cpc-item:hover::before { background: #10b981; }
.cheat-sheet-item.ctr-item:hover::before { background: #d97706; }
.cheat-sheet-item.cpi-item:hover::before { background: #7c3aed; }

.cheat-sheet-tag {
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 0.4rem;
}
.cheat-sheet-tag.cpm-t { background: rgba(37, 99, 235, 0.1); color: var(--primary); }
.cheat-sheet-tag.cpc-t { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.cheat-sheet-tag.ctr-t { background: rgba(245, 158, 11, 0.1); color: #d97706; }
.cheat-sheet-tag.cpi-t { background: rgba(139, 92, 246, 0.1); color: #7c3aed; }

.cheat-sheet-formula {
  margin: 6px 0 4px 0 !important;
  font-size: 0.95rem !important;
  font-weight: 700 !important;
  color: var(--text-primary) !important;
  font-family: 'DM Mono', Consolas, Monaco, monospace !important;
  letter-spacing: -0.02em;
}
.cheat-sheet-desc {
  margin: 0;
  font-size: 0.775rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.4 !important;
}

/* Secondary Button for Clear Form */
.cz .btn-secondary-cz {
  background: transparent;
  border: 1.5px solid var(--border-color);
  border-radius: var(--rm);
  color: var(--text-secondary);
  font-family: var(--font-body), sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
}
.cz .btn-secondary-cz:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* Copy Results Button */
.copy-btn {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary) !important;
  padding: 5px 11px !important;
  border-radius: 6px !important;
  font-size: 11px !important;
  font-weight: 600 !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  z-index: 10 !important;
  position: relative !important;
  text-decoration: none !important;
  line-height: 1 !important;
  margin: 0 !important;
}
.copy-btn:hover {
  background: var(--bg-primary) !important;
  border-color: var(--primary) !important;
  color: var(--primary) !important;
}
.copy-btn svg {
  transition: transform 0.2s ease !important;
}
.copy-btn:hover svg {
  transform: scale(1.1) !important;
}

/* Accent top bar for calculator */
.cz .cc {
  position: relative;
  overflow: hidden;
}
.cz .cc::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 5;
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.05rem !important;
    gap: 0.4rem !important;
  }
  .logo-icon-svg {
    width: 1.85rem !important;
    height: 1.85rem !important;
  }
  .header-actions {
    gap: 0.5rem !important;
  }
  .theme-toggle-btn {
    width: 2rem !important;
    height: 2rem !important;
  }
}

/* Responsive Content Images */
.content-image-wrapper {
  margin: 1.5rem 0 2rem 0;
  width: 100%;
  display: flex;
  justify-content: center;
}

.content-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-image:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}