:root {
  --bg-color: #fafcff;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --danger-color: #ef4444;
  --success-color: #10b981;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --glass-shadow: 0 10px 30px -5px rgba(99, 102, 241, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  --input-bg: #ffffff;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.08), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.08), transparent 25%),
    linear-gradient(135deg, #fafcff 0%, #f0fdfa 100%);
  background-attachment: fixed;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  color: #1e293b;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.logo span {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  margin-left: 2rem;
  transition: color 0.2s ease;
  font-size: 0.95rem;
}

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

.dropdown {
  position: relative;
  display: inline-block;
  margin-left: 2rem;
}

.dropbtn {
  background-color: transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s ease;
  padding: 10px 0;
}

.dropdown:hover .dropbtn {
  color: var(--accent-color);
}

.dropdown-content {
  display: block;
  opacity: 0;
  visibility: hidden;
  position: absolute;
  background-color: var(--card-bg);
  min-width: 220px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  border-radius: 12px;
  border: 1px solid var(--card-border);
  z-index: 1000;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  max-height: 400px;
  overflow-y: auto;
}

.dropdown-content::-webkit-scrollbar {
  width: 6px;
}
.dropdown-content::-webkit-scrollbar-track {
  background: transparent;
}
.dropdown-content::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 10px;
}

.dropdown-content a {
  color: var(--text-primary);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  margin: 0;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.9rem;
  transition: background-color 0.2s ease, padding-left 0.2s ease;
}

.dropdown-content a:last-child {
  border-bottom: none;
}

.dropdown-content a:hover {
  background-color: #f1f5f9;
  color: var(--accent-color);
  padding-left: 20px;
}

.dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-btn {
  background: var(--accent-gradient);
  color: white !important;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-weight: 600 !important;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
  transition: all 0.2s ease !important;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(236, 72, 153, 0.3);
}

/* Main Layout */
main {
  max-width: 1200px;
  margin: 100px auto 4rem;
  padding: 0 2rem;
  min-height: calc(100vh - 250px);
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 6rem 2rem;
  margin-bottom: 3rem;
  border-radius: 24px;
  background: #ffffff url('hero-bg.jpg') no-repeat center center;
  background-size: cover;
  border: 1px solid var(--card-border);
  box-shadow: 0 20px 40px rgba(0,0,0,0.03);
  animation: fadeInDown 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.hero-section h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  letter-spacing: -1px;
}

.hero-section p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.8) 50%, rgba(255,255,255,0) 100%);
  transform: skewX(-25deg);
  transition: all 0.6s ease;
  z-index: -1;
}

.tool-card:hover::before {
  left: 200%;
}

.tool-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.15), 0 10px 10px -5px rgba(236, 72, 153, 0.05);
  border-color: #c7d2fe;
}

.tool-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  background: #f1f5f9;
  color: var(--text-secondary);
}

.tool-category.finance { background: #eff6ff; color: #1d4ed8; }
.tool-category.health { background: #ecfdf5; color: #047857; }
.tool-category.utility { background: #fffbeb; color: #b45309; }
.tool-category.math { background: #f5f3ff; color: #6d28d9; }
.tool-category.education { background: #fdf2f8; color: #be185d; }

.tool-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex-grow: 1;
}

/* Individual Tool Pages */
.content-wrapper {
  max-width: 900px;
  margin: 0 auto;
  animation: fadeInUp 0.5s ease;
}

.content-wrapper h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.content-wrapper .description {
  color: var(--text-secondary);
  font-size: 1.15rem;
  margin-bottom: 2.5rem;
}

/* Calculator Container - Clean FinTech Style */
.calculator-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top: 4px solid var(--accent-color);
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  margin-bottom: 3rem;
  position: relative;
  transition: box-shadow 0.3s ease;
}

.calculator-container:hover {
  box-shadow: 0 25px 50px -12px rgba(37, 99, 235, 0.15);
}

/* Form Elements */
.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: #334155;
}

.input-group input, 
.input-group select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--input-bg);
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: all 0.2s ease;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
}

.input-group input:focus, 
.input-group select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.btn-primary {
  width: 100%;
  padding: 1rem;
  background: var(--accent-gradient);
  border: none;
  border-radius: 10px;
  color: white;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(236, 72, 153, 0.4);
}

/* Responsive Utility Layouts */
.input-flex-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

@media (max-width: 600px) {
  .input-flex-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  .input-flex-row span {
    text-align: center;
  }
}

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

@media (max-width: 500px) {
  .input-grid-2col {
    grid-template-columns: 1fr;
  }
}

/* Results Area */
.results-area {
  margin-top: 0;
  padding-top: 0;
  animation: fadeIn 0.5s ease;
  background: #f8fafc;
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid #e2e8f0;
}

.result-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-left: 4px solid var(--accent-color);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.result-card:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.1);
}

.result-card h4 {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.result-card .value {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -1px;
  transition: color 0.3s ease;
}

.result-card:hover .value {
  color: var(--accent-color);
}

/* Dynamic Inline Styles Override for specific ID elements injected by JS */
div[style*="rgba(255,255,255,0.02)"] {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05) !important;
}

div[style*="rgba(255,255,255,0.1)"] {
  background: #e2e8f0 !important;
}

input[style*="rgba(0,0,0,0.2)"], select[style*="rgba(0,0,0,0.2)"] {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  color: var(--text-primary) !important;
}

input.c-name::placeholder {
  color: #94a3b8 !important;
}

.btn-quick-tip[style*="rgba(59, 130, 246, 0.2)"] {
  background: #eff6ff !important;
}

/* SEO Content Area */
.seo-content {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.seo-content h2, .seo-content h3 {
  margin: 2rem 0 1rem;
  color: #0f172a;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.seo-content h2:first-child {
  margin-top: 0;
}

.seo-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.faq details {
  background: #ffffff;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq details:hover {
  border-color: #cbd5e1;
}

.faq summary {
  padding: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq summary::after {
  content: "+";
  font-size: 1.5rem;
  color: #94a3b8;
  font-weight: 300;
  transition: transform 0.3s;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq p {
  padding: 0 1.25rem 1.25rem;
  margin: 0;
  color: var(--text-secondary);
}

/* Footer */
footer {
  border-top: 1px solid var(--card-border);
  padding: 4rem 0 0 0;
  background: #ffffff;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 3rem;
}

.footer-col:first-child {
  max-width: 400px;
  flex: 1 1 300px;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-col h4 {
  color: #0f172a;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-col p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding: 1.5rem 2rem;
  text-align: center;
  background: #f8fafc;
}

.footer-bottom p {
  color: #64748b;
  font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Layout Classes for About & Contact Pages */
.about-grid, .contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  text-align: left;
  margin-bottom: 4rem;
}

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

/* Responsive */
/* Mobile Hamburger Menu */
.nav-toggle, .nav-toggle-label {
  display: none;
}

@media (max-width: 768px) {
  .nav-container {
    padding: 1rem;
    position: relative;
  }
  
  .nav-toggle-label {
    display: block;
    cursor: pointer;
    position: absolute;
    top: 50%;
    right: 1.5rem;
    transform: translateY(-50%);
    padding: 0.5rem;
  }
  
  .nav-toggle-label span,
  .nav-toggle-label span::before,
  .nav-toggle-label span::after {
    display: block;
    background: var(--text-primary);
    height: 3px;
    width: 24px;
    border-radius: 3px;
    position: relative;
    transition: all 0.3s ease;
  }
  
  .nav-toggle-label span::before,
  .nav-toggle-label span::after {
    content: '';
    position: absolute;
  }
  
  .nav-toggle-label span::before { bottom: 8px; }
  .nav-toggle-label span::after { top: 8px; }

  .nav-toggle:checked ~ .nav-toggle-label span { background: transparent; }
  .nav-toggle:checked ~ .nav-toggle-label span::before { transform: rotate(45deg); bottom: 0; }
  .nav-toggle:checked ~ .nav-toggle-label span::after { transform: rotate(-45deg); top: 0; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
  }
  
  .nav-toggle:checked ~ .nav-links {
    max-height: 85vh;
    padding: 1rem 2rem 2rem;
    border-top: 1px solid var(--card-border);
    overflow-y: auto;
  }

  .nav-links a {
    margin: 0.75rem 0;
    font-size: 1.1rem;
    width: 100%;
  }
  
  .dropdown {
    margin: 0;
    width: 100%;
  }

  .dropbtn {
    font-size: 1.1rem;
    padding: 1rem 0;
    width: 100%;
    text-align: left;
    display: block;
  }
  
  .dropdown-content {
    position: static !important;
    box-shadow: none;
    border: none;
    background: transparent;
    opacity: 0;
    visibility: hidden;
    transform: none !important;
    left: 0 !important;
    min-width: 100%;
    max-height: 0;
    padding-left: 1rem;
    transition: all 0.3s ease;
  }
  
  .dropdown:hover .dropdown-content {
    opacity: 0;
    visibility: hidden;
    max-height: 0;
  }

  .dropdown.active .dropdown-content,
  .dropdown.active:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
    max-height: 2000px;
    margin-top: 0.5rem;
  }

  .dropdown-content a {
    margin: 0;
    padding: 0.75rem 0;
    border: none;
    width: 100%;
    display: block;
  }
  
  .dropdown-content a:hover {
    padding-left: 10px;
    background: transparent;
  }

  /* Other mobile layout fixes */
  main {
    margin-top: 80px;
    padding: 0 1rem;
  }
  .hero-section { padding: 2.5rem 0 1.5rem; }
  .hero-section h1 { font-size: 2.25rem; }
  .hero-section p { font-size: 1.1rem; padding: 0 1rem; }
  
  .content-wrapper h1 { font-size: 2rem; }
  .content-wrapper .description { margin-bottom: 1.5rem; font-size: 1rem; }
  
  .about-grid, .contact-grid, .form-grid, .tools-grid { grid-template-columns: 1fr !important; gap: 1.5rem; }
  .footer-container { flex-direction: column; gap: 2rem; text-align: center; justify-content: flex-start !important; }
  .footer-col { align-items: center; }
  .footer-col:first-child { max-width: 100%; flex: none !important; }
  
  /* Force single-column collapse for ALL calculators on mobile */
  .calculator-grid {
    grid-template-columns: 1fr !important;
    gap: 1.5rem !important;
  }
  
  .calculator-container { padding: 1.25rem; }
  .results-area { padding: 1.25rem; border-left: none; border-top: 1px solid var(--card-border); margin-top: 1.5rem; padding-top: 1.5rem; }
  .input-group { flex-direction: column; align-items: flex-start; }
  .input-wrapper { width: 100%; }
}

.social-links a:hover {
  background: var(--accent-color) !important;
  color: white !important;
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Tables & Dynamic Content Styles */
.content-table-container { width: 100%; overflow-x: auto; margin: 1.5rem 0; border-radius: 8px; border: 1px solid var(--card-border); }
table { width: 100%; border-collapse: collapse; background: var(--card-bg); font-size: 0.95rem; text-align: left; }
th, td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--card-border); }
th { background: rgba(255, 255, 255, 0.03); font-weight: 600; color: var(--text-primary); }
td { color: var(--text-secondary); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255, 255, 255, 0.02); }
.seo-content h2 { font-size: 1.75rem; margin-top: 2.5rem; margin-bottom: 1rem; color: var(--text-primary); }
.seo-content h3 { font-size: 1.35rem; margin-top: 2rem; margin-bottom: 0.75rem; color: var(--text-primary); }
.seo-content p { margin-bottom: 1.25rem; line-height: 1.7; }
.seo-content ul, .seo-content ol { margin-bottom: 1.5rem; padding-left: 1.5rem; color: var(--text-secondary); }
.seo-content li { margin-bottom: 0.5rem; }



/* Final Absolute Mobile Responsive Overrides */
@media (max-width: 500px) {
    h1 { font-size: 1.85rem !important; word-wrap: break-word; }
    h2 { font-size: 1.5rem !important; }
    .calculator-container { padding: 1rem !important; border-radius: 12px; }
    .seo-content { padding: 1.5rem 1rem !important; }
    input, select, button { font-size: 16px !important; } 
    
    div[class*="grid"], div[class*="wrapper"], div[class*="stack"], div[class*="container"] {
        max-width: 100%;
        box-sizing: border-box;
    }
    table { font-size: 0.85rem !important; }
}