@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Default: Dark Theme Colors */
  --bg-color: #0b0f19;
  --bg-gradient: radial-gradient(circle at 50% 0%, #151d30 0%, #0b0f19 70%);
  --card-bg: rgba(17, 24, 39, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.15);
  --accent: #d946ef;
  --accent-glow: rgba(217, 70, 239, 0.15);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --info: #06b6d4;

  --input-bg: rgba(31, 41, 55, 0.6);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: #6366f1;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px 0 rgba(99, 102, 241, 0.2);

  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s ease;
}

[data-theme="light"] {
  /* Light Theme Colors */
  --bg-color: #f8fafc;
  --bg-gradient: radial-gradient(circle at 50% 0%, #eff6ff 0%, #f8fafc 75%);
  --card-bg: rgba(255, 255, 255, 0.8);
  --card-border: rgba(0, 0, 0, 0.06);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --primary: #4f46e5;
  --primary-hover: #3730a3;
  --primary-glow: rgba(79, 70, 229, 0.1);
  --accent: #c084fc;
  --accent-glow: rgba(192, 132, 252, 0.1);
  --success: #059669;
  --success-glow: rgba(5, 150, 105, 0.1);
  --warning: #d97706;
  --info: #0891b2;

  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --input-focus: #4f46e5;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  --shadow-glow: 0 0 20px 0 rgba(79, 70, 229, 0.12);
}

[data-theme="green"] {
  /* Green Theme Colors */
  --bg-color: #061f14;
  --bg-gradient: radial-gradient(circle at 50% 0%, #0d3824 0%, #061f14 75%);
  --card-bg: rgba(10, 48, 33, 0.75);
  --card-border: rgba(16, 185, 129, 0.12);
  --text-primary: #f0fdf4;
  --text-secondary: #a7f3d0;
  --text-muted: #4ade80;

  --primary: #10b981;
  --primary-hover: #34d399;
  --primary-glow: rgba(16, 185, 129, 0.15);
  --accent: #34d399;
  --accent-glow: rgba(52, 211, 153, 0.15);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --info: #06b6d4;

  --input-bg: rgba(6, 31, 20, 0.6);
  --input-border: rgba(16, 185, 129, 0.2);
  --input-focus: #10b981;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px 0 rgba(16, 185, 129, 0.2);
}

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

html, body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: var(--input-border);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
  padding: 16px 0;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.logo i {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: unset;
  -webkit-text-fill-color: initial;
  color: white;
  padding: 6px;
  border-radius: var(--radius-sm);
}

nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width var(--transition-normal);
}

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

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.support-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, #ff5e5b 0%, #ff8a5c 100%);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(255, 94, 91, 0.2);
}

.support-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 16px rgba(255, 94, 91, 0.35);
  background: linear-gradient(135deg, #ff4a47 0%, #ff7744 100%);
}

.support-btn i {
  font-size: 1.1rem;
}

.theme-toggle-btn {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: scale(1.05);
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Free Badge & Hero */
.badge-free {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(217, 70, 239, 0.15) 100%);
  border: 1px solid var(--primary-glow);
  color: var(--text-primary);
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.08);
}

.badge-free span {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero {
  padding: 80px 0 40px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(217, 70, 239, 0.05) 50%, transparent 100%);
  z-index: -1;
  pointer-events: none;
  filter: blur(40px);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--primary) 20%, var(--accent) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 30px auto;
  font-weight: 400;
}

/* Glass Cards and Dashboard */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

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

/* Inputs & Form styling */
.form-group {
  margin-bottom: 20px;
  position: relative;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.input-prefix {
  position: absolute;
  left: 16px;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1.05rem;
  user-select: none;
}

.form-control {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 1.05rem;
  font-weight: 500;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.input-wrapper .form-control {
  padding-left: 36px;
}

.form-control:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Results section styling */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px;
}

.result-card {
  background: rgba(31, 41, 55, 0.3);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .result-card {
  background: rgba(241, 245, 249, 0.7);
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
  opacity: 0.7;
}

.result-card:nth-child(even)::before {
  background: var(--accent);
}

.result-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.result-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  display: block;
}

.result-card.highlight {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(217, 70, 239, 0.08) 100%);
  border-color: var(--primary-glow);
}

.result-card.highlight::before {
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

/* All Calculators Catalog Section */
.suite-section {
  padding: 60px 0;
}

.section-title {
  text-align: center;
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 48px auto;
}

.calculators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.calc-suite-card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: all var(--transition-normal);
}

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

.calc-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-glow);
  color: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.calc-suite-card:nth-child(even) .calc-icon {
  background: var(--accent-glow);
  color: var(--accent);
}

.calc-suite-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.calc-suite-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

.calc-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary-glow);
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  width: 100%;
  transition: all var(--transition-normal);
  text-align: center;
}

.calc-suite-card:hover .calc-link {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 12px var(--primary-glow), 0 0 10px var(--accent-glow);
}

.calc-link i {
  transition: transform var(--transition-fast);
}

.calc-suite-card:hover .calc-link i {
  transform: translateX(4px);
}

/* Specific Calculator Layout (Single Page) */
.calc-layout {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 32px;
  margin-top: 40px;
  margin-bottom: 60px;
}

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

.calc-header {
  margin-bottom: 30px;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 20px;
}

.calc-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.calc-header p {
  color: var(--text-secondary);
}

.calc-inputs {
  margin-bottom: 30px;
}

.calc-results-panel {
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid var(--primary-glow);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 24px;
}

[data-theme="light"] .calc-results-panel {
  background: rgba(79, 70, 229, 0.03);
}

.panel-title {
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  color: var(--primary);
  margin-bottom: 16px;
}

.calc-explanation {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  height: fit-content;
}

.calc-explanation h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.formula-block {
  background: var(--input-bg);
  border-left: 4px solid var(--primary);
  padding: 16px;
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-size: 1rem;
  margin-bottom: 20px;
  overflow-x: auto;
}

.explanation-list {
  padding-left: 20px;
  margin-bottom: 20px;
}

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

/* Interlinking: Related Calculators Sidebar or Section */
.related-section {
  padding: 48px 0;
  border-top: 1px solid var(--card-border);
  margin-top: 60px;
}

.related-section h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.related-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition-normal);
}

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

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.4;
}

/* Static pages stylesheet */
.info-layout {
  max-width: 800px;
  margin: 60px auto 100px auto;
  padding: 0 20px;
}

.info-layout h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
  text-align: center;
}

.info-content {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.info-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 30px 0 15px 0;
}

.info-content p {
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.info-content ul {
  margin-bottom: 24px;
  padding-left: 24px;
}

.info-content li {
  margin-bottom: 10px;
  color: var(--text-secondary);
}

/* Contact form custom page styles */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-info-item i {
  font-size: 1.5rem;
  color: var(--primary);
  background: var(--primary-glow);
  padding: 12px;
  border-radius: var(--radius-sm);
}

.contact-info-item h3 {
  font-weight: 700;
  margin-bottom: 4px;
}

.contact-info-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: 14px 28px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--primary-glow), 0 0 15px var(--accent-glow);
}

.btn-secondary {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  box-shadow: none;
}

.btn-secondary:hover {
  background: var(--input-border);
  color: var(--text-primary);
  box-shadow: none;
  transform: none;
}

/* Blog layouts */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
  margin-top: 40px;
  margin-bottom: 80px;
}

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

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

.blog-img {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--primary-glow) 0%, var(--accent-glow) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--primary);
}

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

.blog-meta {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
}

.blog-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
}

.blog-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* A/B Testing specific CSS rules */
.ab-flex {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
}

.ab-flex > div {
  flex: 1;
}

.ab-badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.ab-badge.a {
  background: var(--primary-glow);
  color: var(--primary);
}

.ab-badge.b {
  background: var(--accent-glow);
  color: var(--accent);
}

.ab-stat-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  margin-bottom: 8px;
}

/* Footer Section */
footer {
  background: var(--bg-color);
  border-top: 1px solid var(--card-border);
  padding: 60px 0 30px 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  margin-bottom: 20px;
  max-width: 280px;
}

.footer-links h4 {
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

/* Toast message styles */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--success);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast i {
  color: var(--success);
  font-size: 1.2rem;
}

/* Mobile responsive styles */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  .grid-2col, .calc-layout, .contact-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--card-border);
    padding: 24px;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    box-shadow: var(--shadow-lg);
  }

  nav.show {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .theme-toggle-btn {
    align-self: flex-start;
  }

  .hero {
    padding: 60px 0 30px 0;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

/* Author / Reviewer Box Styling */
.author-box {
  max-width: 800px;
  margin: 40px auto;
  padding: 24px 24px 24px 88px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.author-box:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.author-box::before {
  content: "\f4fc"; /* FontAwesome user-check icon */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.8rem;
  color: var(--primary);
  background: var(--primary-glow);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.author-box:hover::before {
  background: var(--primary);
  color: white;
}

.author-box h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin: 0 0 6px 0;
  font-weight: 700;
}

.author-box p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.author-box p strong {
  color: var(--text-primary);
  font-size: 1.1rem;
}

@media (max-width: 600px) {
  .author-box {
    padding: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  .author-box::before {
    position: static;
    transform: none;
  }
}

/* Helper Utilities and Layout classes replacing inline styles */
.section-divider {
  padding: 60px 24px;
  border-top: 1px solid var(--card-border);
}

.breadcrumbs {
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.breadcrumbs span {
  color: var(--text-muted);
  font-weight: 500;
}

.seo-guide-wrapper {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.8;
  font-size: 1.05rem;
}

.seo-guide-wrapper h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 24px;
  text-align: center;
}

.seo-guide-wrapper h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 30px 0 16px 0;
}

.seo-guide-wrapper ul {
  margin-bottom: 24px;
  padding-left: 24px;
}

.seo-guide-wrapper li {
  margin-bottom: 10px;
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  margin-top: 16px;
  background: rgba(31, 41, 55, 0.4);
  border-radius: var(--radius-md);
  overflow: hidden;
}

[data-theme="light"] .seo-table {
  background: rgba(241, 245, 249, 0.6);
}

.seo-table thead tr {
  background: var(--primary-glow);
  text-align: left;
}

.seo-table th {
  padding: 14px;
  font-weight: 700;
}

.seo-table tbody tr {
  border-bottom: 1px solid var(--card-border);
}

.seo-table td {
  padding: 14px;
}

.seo-guide-wrapper h2.formula-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 40px 0 20px 0;
}

.seo-resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.seo-resource-link {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.seo-resource-link i {
  color: var(--primary);
}

.footer-social-wrapper {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.footer-social-link {
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: color var(--transition-fast);
}

.footer-social-link:hover {
  color: var(--primary);
}

/* FAQ Details Styling (index.html) */
.faq-list-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.faq-details {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 20px;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  margin-bottom: 16px;
}

.faq-details summary {
  font-weight: 700;
  cursor: pointer;
  font-size: 1.1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-details summary i {
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}

.faq-details[open] summary i {
  transform: rotate(180deg);
}

.faq-details p {
  color: var(--text-secondary);
  margin-top: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Main content containers replacement */
.guide-main-content {
  padding: 40px 24px 60px 24px;
  max-width: 800px;
  line-height: 1.8;
}

.related-section-spaced {
  margin-top: -20px;
  margin-bottom: 60px;
}

/* Guide Page styling replacements */
.back-link-wrapper {
  margin-bottom: 24px;
}

.back-link {
  color: var(--primary);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--primary-hover);
}

.guide-meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: -10px;
  margin-bottom: 30px;
}

/* Calculator layout enhancements replacing inline styles */
.calc-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-top: 16px;
  margin-bottom: 8px;
}

.calc-meta-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.calc-meta-bar i {
  color: var(--primary);
}

.calc-meta-bar a {
  text-decoration: underline;
  font-weight: 600;
  color: var(--text-secondary);
}

.calc-results-panel .result-value {
  font-size: 3rem;
  color: var(--primary);
}

.calc-explanation {
  line-height: 1.8;
  font-size: 1.05rem;
}

/* Formula variants */
.formula-block.border-accent {
  border-left-color: var(--accent);
}

.formula-block.border-primary {
  border-left-color: var(--primary);
}

/* Calculator FAQs */
.calc-faq-wrapper {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-faq-wrapper h4 {
  font-weight: 700;
  margin-bottom: 6px;
}

.calc-faq-wrapper p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Hero Trust Signals & Dashboard Tip */
.hero-trust-signals {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
}

.hero-trust-signals span i {
  color: var(--success);
  margin-right: 6px;
}

.dashboard-tip-wrapper {
  margin-top: 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.dashboard-tip-wrapper i {
  color: var(--primary);
}

.suite-section.section-divider {
  background: rgba(31, 41, 55, 0.2);
}

[data-theme="light"] .suite-section.section-divider {
  background: rgba(241, 245, 249, 0.4);
}

/* Blog guide layout and article styling classes */
.guide-layout-wrapper {
  max-width: 900px;
  margin-top: 60px;
  margin-bottom: 80px;
}

.guide-title-main {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.guide-underline-link {
  color: var(--primary);
  text-decoration: underline;
  font-weight: 600;
}

/* Guide tables */
.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: rgba(31, 41, 55, 0.4);
  border-radius: 8px;
  overflow: hidden;
}

[data-theme="light"] .guide-table {
  background: rgba(241, 245, 249, 0.6);
}

.guide-table thead tr {
  background: var(--primary-glow);
  text-align: left;
}

.guide-table th {
  padding: 14px;
  font-weight: 700;
}

.guide-table tbody tr {
  border-bottom: 1px solid var(--card-border);
}

.guide-table td {
  padding: 14px;
}

/* Small spacing rules */
.indent-list {
  padding-left: 20px;
  margin-bottom: 20px;
}

.indent-list-large {
  padding-left: 20px;
  margin-bottom: 24px;
}

/* General Layout sections spacing */
.outer-spaced-container {
  margin-top: 60px;
  margin-bottom: 80px;
}

.section-title-large {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle-large {
  color: var(--text-secondary);
  text-align: center;
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 40px auto;
}

.btn-left-aligned {
  padding: 10px 20px;
  font-size: 0.9rem;
  align-self: flex-start;
}

/* Card gradients */
.badge-accent-gradient {
  background: linear-gradient(135deg, var(--accent-glow) 0%, var(--primary-glow) 100%);
  color: var(--accent);
}

.badge-success-gradient {
  background: linear-gradient(135deg, var(--success-glow) 0%, var(--primary-glow) 100%);
  color: var(--success);
}

.badge-primary-gradient {
  background: linear-gradient(135deg, var(--primary-glow) 0%, var(--accent-glow) 100%);
  color: var(--primary);
}

.badge-warning-gradient {
  background: linear-gradient(135deg, var(--accent-glow) 0%, var(--success-glow) 100%);
  color: var(--accent);
}

/* Simple mono highlight */
.text-mono-primary {
  font-family: monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

/* Simple boxed block */
.boxed-text-block {
  background: rgba(31, 41, 55, 0.4);
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  margin-top: 12px;
  line-height: 1.5;
}

/* Text primary highlight */
.text-highlight-accent {
  color: var(--accent);
}

.text-highlight-primary {
  color: var(--primary);
}

/* Extra utility classes replacing inline styles */
.text-muted-color {
  color: var(--text-muted);
}

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

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

.text-success-large {
  color: var(--success);
  font-size: 2.2rem;
}

.section-divider h2 {
  font-size: 2.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 40px;
}

/* contact.html styles */
.textarea-resizable {
  resize: vertical;
  min-height: 120px;
}

.calc-faq-sub-wrapper {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 20px;
}

.calc-faq-sub-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .calc-faq-sub-wrapper {
    grid-template-columns: 1fr;
  }
}

.result-label-block {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 4px;
}

.mt-10 {
  margin-top: 10px;
}

/* Phase 2 Styles */
.action-btn-group {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.analyzer-box {
  margin-top: 24px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
  transition: all var(--transition-normal);
}

.analyzer-box h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.analyzer-box p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

@media print {
  header,
  nav,
  .mobile-menu-btn,
  .theme-toggle-btn,
  .breadcrumbs,
  .calc-explanation,
  .related-section,
  .author-box,
  footer,
  .action-btn-group,
  .badge-free {
    display: none !important;
  }
  
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  
  :root {
    --bg-color: #ffffff;
    --text-primary: #000000;
    --text-secondary: #333333;
    --card-bg: #ffffff;
    --card-border: #cccccc;
    --input-bg: #f3f4f6;
  }

  .container {
    padding: 0 !important;
    max-width: 100% !important;
  }
  
  .calc-layout {
    display: block !important;
  }
  
  .calc-card-main {
    width: 100% !important;
    border: none !important;
    box-shadow: none !important;
    background: transparent !important;
    padding: 0 !important;
  }
  
  .calc-inputs {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 15px !important;
  }
  
  .form-control {
    border: 1px solid #999999 !important;
    background: #ffffff !important;
    color: #000000 !important;
  }
  
  .input-prefix {
    border: 1px solid #999999 !important;
    border-right: none !important;
    background: #eeeeee !important;
    color: #333333 !important;
  }
  
  .calc-results-panel {
    background: #f3f4f6 !important;
    border: 1px solid #999999 !important;
    color: #000000 !important;
    margin-top: 30px !important;
    page-break-inside: avoid !important;
  }
  
  .result-value {
    color: #000000 !important;
  }
  
  .analyzer-box {
    background: #f9fafb !important;
    border: 1px solid #999999 !important;
    color: #000000 !important;
    page-break-inside: avoid !important;
  }
}