:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #0ea5e9;
  --accent-hover: #38bdf8;
  --border-color: #334155;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius: 0.75rem;
  --container-width: 1200px;
  --header-height: 4rem;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Layout */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

/* Navigation */
header {
  height: var(--header-height);
  background-color: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo img {
  height: 2.25rem;
  width: auto;
  border-radius: 4px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

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

/* Hero Section */
.hero {
  text-align: center;
  padding: 6rem 1.5rem;
  background: radial-gradient(circle at top, rgba(14, 165, 233, 0.1), transparent);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-container {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.search-container input {
  width: 100%;
  padding: 1rem 1.5rem;
  padding-left: 3rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-container input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
  background-color: #243147;
}

.search-container input:hover {
  border-color: rgba(14, 165, 233, 0.5);
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
  z-index: 10;
}

/* Grid System */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.tool-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--accent-color);
  box-shadow: 0 10px 30px -5px rgba(14, 165, 233, 0.3), 0 0 15px rgba(14, 165, 233, 0.1);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.05) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

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

/* Category Filters */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  background: rgba(30, 41, 59, 0.5);
  padding: 0.75rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.filter-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.625rem 1.25rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-btn:hover {
  color: var(--accent-color);
  background: rgba(14, 165, 233, 0.05);
}

.filter-btn.active {
  background: var(--accent-color);
  color: white;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

/* Animations */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.5s ease forwards;
}

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

.tool-icon {
  width: 3rem;
  height: 3rem;
  background-color: rgba(14, 165, 233, 0.1);
  color: var(--accent-color);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.tool-card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.3s ease, transform 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--accent-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

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

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

/* Tool Page Specifics */
.tool-header {
  margin-bottom: 3rem;
  text-align: center;
}

.tool-container {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--border-color);
  max-width: 800px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
}

textarea, input[type="text"], input[type="number"], input[type="email"], input[type="url"], input[type="tel"], input[type="password"] {
  width: 100%;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
}

textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.stats-bar {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.stat-item span:first-child {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-right: 0.5rem;
}

.stat-item span:last-child {
  font-weight: 700;
  color: var(--accent-color);
}

/* Footer style */
footer {
  background-color: #020617;
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border-color);
  margin-top: 6rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h2 {
  color: var(--accent-color);
  margin-bottom: 1rem;
}

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

.footer-links h4 {
  margin-bottom: 1.25rem;
  font-size: 1.125rem;
}

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

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.developer-link {
  background: linear-gradient(90deg, #38bdf8, #818cf8, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  text-decoration: none;
  display: inline-block;
}

.suggestion-cta {
  margin-top: 4rem;
  text-align: center;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.05) 0%, rgba(129, 140, 248, 0.05) 100%);
  padding: 3.5rem 2rem;
  border-radius: 24px;
  border: 1px dashed var(--accent-color);
  transition: transform 0.3s ease, border-style 0.3s ease;
}

.suggestion-cta:hover {
  transform: translateY(-5px);
  border-style: solid;
}

.ad-placeholder {
  background-color: rgba(15, 23, 42, 0.4);
  border: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem auto;
  border-radius: 8px;
  min-height: 90px;
  max-width: 1200px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ad-placeholder::after {
  content: "Advertisement Placeholder";
}

/* Contact Page */
.contact-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
}

.contact-form-wrapper {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 3rem;
  border: 1px solid var(--border-color);
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 3rem 1rem;
  }

  .container {
    padding: 0 1rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .section {
    padding: 2.5rem 0;
  }
  
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .nav-links.mobile-active {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-color);
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    gap: 1.5rem;
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
  }

  .nav-links.mobile-active a {
    font-size: 1.25rem;
    width: 100%;
    padding: 0.5rem 0;
  }

  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  .tools-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.75rem !important;
  }

  .tool-card {
    padding: 1rem;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
  }

  .tool-card h3 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .tool-card p {
    font-size: 0.75rem;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
  }

  .tool-icon {
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.1rem;
    margin: 0 auto 0.75rem;
  }

  .tool-card .btn {
    padding: 0.5rem;
    font-size: 0.8rem;
    margin-top: auto;
  }

  .category-filters {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .filter-btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
  }

  .stats-bar {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .footer-content {
    gap: 2rem;
    text-align: center;
  }

  .footer-brand, .footer-links {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  /* About & Policy Pages Readability */
  main.section.container h1 {
    font-size: 2.25rem !important;
    margin-bottom: 1.5rem !important;
  }

  main.section.container h3 {
    font-size: 1.5rem !important;
    margin: 1.5rem 0 0.75rem !important;
  }

  main.section.container div {
    font-size: 1rem !important;
    line-height: 1.5 !important;
  }

  main.section.container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

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

  .contact-info h1 {
    font-size: 2.5rem !important;
    margin-bottom: 1rem !important;
  }

  .contact-info p {
    margin-bottom: 2rem !important;
  }

  .contact-form-wrapper {
    padding: 1.5rem;
  }

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

  /* All Tools Specific Mobile Optimization */
  .tool-container {
    padding: 1.25rem !important;
  }

  .tool-content {
    grid-template-columns: 1fr !important;
    gap: 1.5rem !important;
  }

  .stats-bar {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 1rem !important;
    padding-top: 1rem !important;
  }

  .stat-item {
    border-left: none !important;
    padding-left: 0 !important;
    font-size: 0.85rem !important;
  }

  .stat-item span:last-child {
    display: block;
    margin-top: 0.25rem;
  }

  /* Target any 2 or 3 column grid in tools to prevent overflow */
  .tool-container div[style*="grid-template-columns: 1fr 1fr"],
  .tool-container div[style*="grid-template-columns:1fr 1fr"],
  .tool-container div[style*="grid-template-columns: 1fr 1fr 1fr"],
  .tool-container div[style*="grid-template-columns:1fr 1fr 1fr"] {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  .age-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  .age-card {
    padding: 1rem !important;
  }

  .age-card span {
    font-size: 2rem !important;
  }

  .sidebar-stats {
    margin-top: 1.5rem;
  }

  .tabs {
    flex-wrap: wrap;
  }
  
  .tab {
    padding: 0.6rem 0.5rem !important;
    font-size: 0.8rem !important;
  }

  textarea {
    min-height: 150px;
  }

  .tool-header h1 {
    font-size: 2rem !important;
  }
}