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

        :root {
            --primary-color: #0066CC;
            --secondary-color: #00A8E8;
            --accent-color: #FFB800;
            --dark-bg: #1A1D29;
            --light-bg: #F8F9FA;
            --text-primary: #2D3748;
            --text-secondary: #718096;
            --success-color: #48BB78;
            --border-radius: 16px;
            --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
            --gradient-warm: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --gradient-blue: linear-gradient(135deg, #0066CC 0%, #00A8E8 100%);
        }

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

        header {
            background: white;
            box-shadow: var(--shadow-soft);
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            background: var(--gradient-blue);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

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

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

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

ul {
    margin-top: 0;
    margin-bottom: 0;
}

        .lang-switch {
            display: flex;
            gap: 0.5rem;
            background: var(--light-bg);
            padding: 0.5rem;
            border-radius: 8px;
        }

        .lang-switch button {
            padding: 0.4rem 1rem;
            border: none;
            background: transparent;
            cursor: pointer;
            border-radius: 6px;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .lang-switch button.active {
            background: var(--primary-color);
            color: white;
        }

     
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 4rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
            opacity: 0.3;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: 29px;
            margin-bottom: 1rem;
            font-weight: 700;
        }

        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }

        .cta-buttons {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            padding: 1rem 2rem;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

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

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            border: 2px solid white;
        }

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

      
        .stats {
            max-width: 1200px;
            margin: -3rem auto 4rem;
            padding: 0 2rem;
            position: relative;
            z-index: 10;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
        }

        .stat-card {
            background: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            text-align: center;
            transition: transform 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            background: var(--gradient-blue);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
        }

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

  
        .categories {
            max-width: 1200px;
            margin: 4rem auto;
            padding: 0 2rem;
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 3rem;
            color: var(--text-primary);
        }

        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .category-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-soft);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
        }

        .category-header {
            padding: 2rem;
            background: var(--gradient-blue);
            color: white;
            position: relative;
        }

        .category-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        .category-header h3 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }

        .category-body {
            padding: 1.5rem;
        }

        .category-features {
            list-style: none;
            margin-bottom: 1.5rem;
        }

        .category-features li {
            padding: 0.5rem 0;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .category-features li::before {
            content: '✓';
            color: var(--success-color);
            font-weight: bold;
        }

        .test-count {
            background: var(--light-bg);
            padding: 0.75rem;
            border-radius: 8px;
            text-align: center;
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }

   
        .features {
            background: white;
            padding: 4rem 2rem;
            margin: 4rem 0;
        }

        .features-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .feature-item {
            text-align: center;
            padding: 2rem;
        }

        .feature-icon {
            width: 80px;
            height: 80px;
            background: #2b595f;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
        }

        .feature-item h3 {
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .feature-item p {
            color: var(--text-secondary);
            line-height: 1.6;
        }

    
        .cta-section {
            background: var(--dark-bg);
            color: white;
            padding: 4rem 2rem;
            text-align: center;
        }

        .cta-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .cta-section h2 {
            font-size: 2rem;
            margin-bottom: 1rem;
        }

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }

   
        footer {
            background: var(--dark-bg);
            color: white;
            padding: 3rem 2rem 1.5rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-section h4 {
            margin-bottom: 1rem;
            color: var(--accent-color);
        }

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

        .footer-section ul li {
            margin-bottom: 0.5rem;
        }

        .footer-section a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer-section a:hover {
            color: white;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.6);
        }

     
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 29px;
            }

            .nav-links {
                display: none;
            }

            .categories-grid {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

   
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-on-scroll {
            animation: fadeInUp 0.6s ease-out;
        }

.categories-grid{
  display:grid;
  grid-template-columns: repeat(4, minmax(180px, 1fr));
  gap: 18px;
}

.tile{
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;

  min-height: 92px;
  padding: 18px 14px;

  border-radius: 14px;
  text-decoration:none;
  color: #1f2d3d;
  font-weight: 500;

  box-shadow: 0 6px 18px rgba(0,0,0,.08);
  border: 1px solid rgba(0,0,0,.04);
  transition: transform .18s ease, box-shadow .18s ease;
}

.tile:hover{
  transform: translateY(-3px);
  box-shadow: 0 10px 26px rgba(0,0,0,.12);
}


.tile-green{ background:#cfeecb; }
.tile-mint { background:#cfe7e4; }
.tile-gray { background:#e9ecef; }
.tile-yellow{ background:#f6e2ab; }


@media (max-width: 992px){
  .categories-grid{ grid-template-columns: repeat(2, minmax(180px, 1fr)); }
}
@media (max-width: 520px){
  .categories-grid{ grid-template-columns: 1fr; }
}

.menu-btn{
  display:none;
  width:44px;
  height:44px;
  border: 1px solid rgba(0,0,0,.08);
  background: #fff;
  border-radius: 12px;
  cursor: pointer;
  padding: 6px;
}
.menu-btn span{
  display:block;
  height:2px;
  background: var(--text-primary);
  margin: 6px 0;
  border-radius: 2px;
}


@media (max-width: 768px) {
  .menu-btn{ display:block; }

  .nav-links{
    position: absolute;
    top: 100%;
    left: 1rem;
    right: 1rem;
    margin-top: 10px;
    background: #fff;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    padding: 12px;
    flex-direction: column;
    gap: 12px;
  }

  .nav-links.is-open{
    display: flex;
  }

  nav{ position: relative; }
}