:root {
      --primary: #00aaff;
      --primary-dark: #008ecc;
      --secondary: #0099ff;
      --accent: #00d4ff;
      --success: #00cc88;
      --warning: #ffaa00;
      --danger: #ff4444;
      --dark: #0f172a;
      --darker: #020617;
      --light: #f8fafc;
      --gray: #64748b;
      --gray-dark: #334155;
    }

    body {
      margin: 0;
      padding: 0;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 50%, #1e293b 100%);
      color: white;
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
      -webkit-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
      -webkit-touch-callout: none;
      -webkit-tap-highlight-color: transparent;
      min-height: 100vh;
      width: 100%;
    }

    html {
      overflow-x: hidden;
      width: 100%;
    }

    * {
      -webkit-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
    }

    /* Dynamic background particles */
    #particles-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      pointer-events: none;
      overflow: hidden;
    }

    .particle {
      position: absolute;
      border-radius: 50%;
      pointer-events: none;
      transition: all 0.3s ease;
      opacity: 0.6;
      animation: float-particle 8s ease-in-out infinite;
    }

    .particle.small {
      width: 3px;
      height: 3px;
      animation-duration: 6s;
    }

    .particle.medium {
      width: 6px;
      height: 6px;
      animation-duration: 8s;
    }

    .particle.large {
      width: 10px;
      height: 10px;
      animation-duration: 10s;
    }

    .particle.xlarge {
      width: 15px;
      height: 15px;
      animation-duration: 12s;
    }

    /* Particle colors */
    .particle.blue {
      background: radial-gradient(circle, rgba(0, 170, 255, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(0, 170, 255, 0.3);
    }

    .particle.cyan {
      background: radial-gradient(circle, rgba(0, 212, 255, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
    }

    .particle.green {
      background: radial-gradient(circle, rgba(0, 204, 136, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(0, 204, 136, 0.3);
    }

    .particle.purple {
      background: radial-gradient(circle, rgba(147, 51, 234, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(147, 51, 234, 0.3);
    }

    .particle.pink {
      background: radial-gradient(circle, rgba(236, 72, 153, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
    }

    .particle.orange {
      background: radial-gradient(circle, rgba(255, 170, 0, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(255, 170, 0, 0.3);
    }

    .particle.red {
      background: radial-gradient(circle, rgba(255, 68, 68, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(255, 68, 68, 0.3);
    }

    .particle.yellow {
      background: radial-gradient(circle, rgba(255, 255, 0, 0.4) 0%, transparent 70%);
      box-shadow: 0 0 10px rgba(255, 255, 0, 0.3);
    }

    @keyframes float-particle {
      0%, 100% { 
        transform: translateY(0px) translateX(0px) rotate(0deg); 
        opacity: 0.6;
      }
      25% { 
        transform: translateY(-30px) translateX(20px) rotate(90deg); 
        opacity: 0.8;
      }
      50% { 
        transform: translateY(-60px) translateX(-15px) rotate(180deg); 
        opacity: 1;
      }
      75% { 
        transform: translateY(-30px) translateX(25px) rotate(270deg); 
        opacity: 0.8;
      }
    }

    @keyframes pulse-particle {
      0%, 100% { 
        transform: scale(1); 
        opacity: 0.6;
      }
      50% { 
        transform: scale(1.3); 
        opacity: 1;
      }
    }

    @keyframes spin-particle {
      0% { 
        transform: rotate(0deg) translateY(0px); 
      }
      100% { 
        transform: rotate(360deg) translateY(-40px); 
      }
    }

    @keyframes wave-particle {
      0%, 100% { 
        transform: translateX(0px) translateY(0px); 
        opacity: 0.6;
      }
      25% { 
        transform: translateX(20px) translateY(-20px); 
        opacity: 0.8;
      }
      50% { 
        transform: translateX(-15px) translateY(-40px); 
        opacity: 1;
      }
      75% { 
        transform: translateX(-25px) translateY(-20px); 
        opacity: 0.8;
      }
    }

    /* Special particle animations */
    .particle.pulse {
      animation: pulse-particle 4s ease-in-out infinite;
    }

    .particle.spin {
      animation: spin-particle 6s linear infinite;
    }

    .particle.wave {
      animation: wave-particle 7s ease-in-out infinite;
    }

    .particle:hover {
      transform: scale(1.5);
      opacity: 1;
      animation-play-state: paused;
    }

    /* Mouse trail effect */
    .mouse-trail {
      position: fixed;
      width: 6px;
      height: 6px;
      background: radial-gradient(circle, rgba(0, 170, 255, 0.8) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
      z-index: 9999;
      transition: all 0.1s ease;
    }

    /* Floating orbs */
    .floating-orb {
      position: fixed;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 170, 255, 0.1) 0%, transparent 70%);
      pointer-events: none;
      z-index: -1;
      animation: float 8s ease-in-out infinite;
    }

    @keyframes float {
      0%, 100% { transform: translateY(0px) rotate(0deg); }
      25% { transform: translateY(-20px) rotate(90deg); }
      50% { transform: translateY(-40px) rotate(180deg); }
      75% { transform: translateY(-20px) rotate(270deg); }
    }

    .orb-1 {
      width: 120px;
      height: 120px;
      top: 10%;
      left: 10%;
      animation-delay: 0s;
    }

    .orb-2 {
      width: 80px;
      height: 80px;
      top: 60%;
      right: 15%;
      animation-delay: 2s;
    }

    .orb-3 {
      width: 100px;
      height: 100px;
      bottom: 20%;
      left: 20%;
      animation-delay: 4s;
    }

    .orb-4 {
      width: 60px;
      height: 60px;
      top: 30%;
      right: 30%;
      animation-delay: 6s;
    }

    /* Interactive grid */
    .interactive-grid {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -2;
      pointer-events: none;
      opacity: 0.1;
    }

    .grid-line {
      position: absolute;
      background: linear-gradient(90deg, transparent, rgba(0, 170, 255, 0.1), transparent);
      transition: all 0.3s ease;
    }

    .grid-line.horizontal {
      width: 100%;
      height: 1px;
    }

    .grid-line.vertical {
      width: 1px;
      height: 100%;
    }

    .container {
      max-width: 1200px;
      margin: auto;
      padding: 40px 20px;
      text-align: center;
    }

    header {
      margin-bottom: 40px;
    }

    h1 {
      font-size: 3.5rem;
      margin-bottom: 10px;
      letter-spacing: 1px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 18px;
      text-shadow: 0 1px 4px #0007;
      color: var(--light);
    }

    p.lead {
      font-size: 1.2rem;
      color: #cbd5e1;
      margin-bottom: 30px;
    }

    .button {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 15px 30px;
      font-size: 1.2rem;
      border: none;
      border-radius: 12px;
      cursor: pointer;
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
      margin-top: 20px;
      box-shadow: 0 4px 20px rgba(0, 170, 255, 0.3);
      position: relative;
      overflow: hidden;
    }

    .button::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
      transition: left 0.5s;
    }

    .button:hover::before {
      left: 100%;
    }

    .button:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 8px 30px rgba(0, 170, 255, 0.4);
    }

    nav {
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0;
      position: relative;
    }

    /* Position mobile menu button to the right */
    .mobile-menu-btn {
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      z-index: 1002;
    }

    /* Language switcher styles */
    .language-switcher {
      display: flex;
      gap: 5px;
      margin-left: 20px;
    }

    .lang-btn {
      background: transparent;
      border: 1px solid rgba(0, 170, 255, 0.3);
      color: var(--primary);
      padding: 5px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.3s ease;
      min-width: 35px;
    }

    .lang-btn:hover {
      background: rgba(0, 170, 255, 0.1);
      border-color: var(--primary);
      transform: scale(1.05);
    }

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

    /* Hide mobile menu elements on desktop */
    @media (min-width: 769px) {
      .mobile-menu-btn,
      .mobile-menu-overlay,
      .mobile-menu-content {
        display: none !important;
      }
    }

    /* Mobile menu button - new design */
    .mobile-menu-btn {
      display: none;
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, rgba(0, 170, 255, 0.1), rgba(0, 212, 255, 0.1));
      border: 1px solid rgba(0, 170, 255, 0.3);
      cursor: pointer;
      padding: 0;
      z-index: 1001;
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      border-radius: 8px;
      transition: all 0.3s ease;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .mobile-menu-btn::before {
      content: '';
      position: absolute;
      width: 18px;
      height: 2px;
      background: var(--primary);
      border-radius: 1px;
      transition: all 0.3s ease;
      transform-origin: center;
    }

    .mobile-menu-btn::after {
      content: '';
      position: absolute;
      width: 18px;
      height: 2px;
      background: var(--primary);
      border-radius: 1px;
      transition: all 0.3s ease;
      transform-origin: center;
    }

    .mobile-menu-btn::before {
      transform: translateY(-6px);
    }

    .mobile-menu-btn::after {
      transform: translateY(6px);
    }

    .mobile-menu-btn.active::before {
      transform: rotate(45deg) translateY(0);
    }

    .mobile-menu-btn.active::after {
      transform: rotate(-45deg) translateY(0);
    }

    .mobile-menu-btn:hover {
      background: linear-gradient(135deg, rgba(0, 170, 255, 0.2), rgba(0, 212, 255, 0.2));
      border-color: var(--primary);
      transform: translateY(-50%) scale(1.05);
    }

    .mobile-menu-btn:active {
      transform: translateY(-50%) scale(0.95);
    }

    .mobile-menu-btn:hover {
      background: rgba(0, 170, 255, 0.1);
      transform: scale(1.1);
    }

    .mobile-menu-btn:hover::before,
    .mobile-menu-btn:hover::after {
      background: var(--accent);
    }

    /* Prevent any focus effects */
    .mobile-menu-btn:focus,
    .mobile-menu-btn:focus-visible,
    .mobile-menu-btn:focus-within {
      outline: none !important;
      box-shadow: none !important;
      -webkit-tap-highlight-color: transparent !important;
    }

    /* Ensure button is always accessible */
    .mobile-menu-btn {
      background: rgba(2, 6, 23, 0.8);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0, 170, 255, 0.2);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
      outline: none;
      -webkit-tap-highlight-color: transparent;
      -webkit-touch-callout: none;
      -webkit-user-select: none;
      -khtml-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
    }

    .mobile-menu-btn:hover {
      background: rgba(2, 6, 23, 0.9);
      border-color: var(--primary);
      box-shadow: 0 4px 20px rgba(0, 170, 255, 0.3);
    }

    .mobile-menu-btn:focus {
      outline: none;
    }

    .mobile-menu-btn:active {
      transform: scale(0.95);
    }

    /* Remove any focus ring or outline completely */
    .mobile-menu-btn:focus-visible {
      outline: none;
      box-shadow: none;
    }

    /* Mobile menu overlay */
    .mobile-menu-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(2, 6, 23, 0.95);
      backdrop-filter: blur(10px);
      z-index: 999;
      opacity: 0;
      visibility: hidden;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .mobile-menu-overlay.active {
      opacity: 1;
      visibility: visible;
    }

    /* Mobile menu content */
    .mobile-menu-content {
      position: fixed;
      top: 0;
      right: -300px;
      width: 280px;
      height: 100%;
      max-width: 85vw;
      background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
      backdrop-filter: blur(20px);
      z-index: 1000;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      padding: 80px 30px 30px;
      box-shadow: -5px 0 30px rgba(0, 0, 0, 0.3);
      border-left: 1px solid rgba(0, 170, 255, 0.2);
      overflow-y: auto;
      overflow-x: hidden;
      opacity: 0;
      visibility: hidden;
    }

    .mobile-menu-content.active {
      right: 0;
      opacity: 1;
      visibility: visible;
    }

    .mobile-menu-content.active {
      right: 0;
    }

    .mobile-menu-content a {
      display: block;
      color: var(--light);
      text-decoration: none;
      font-size: 1.2rem;
      font-weight: 600;
      padding: 15px 0;
      margin: 10px 0;
      border-bottom: 1px solid rgba(0, 170, 255, 0.1);
      transition: all 0.3s ease;
      position: relative;
    }

    .mobile-menu-content a:hover,
    .mobile-menu-content a:focus {
      color: var(--primary);
      padding-left: 15px;
      border-bottom-color: var(--primary);
    }

    .mobile-menu-content a::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

    .mobile-menu-content a:hover::before {
      width: 10px;
    }

    /* Prevent text selection on mobile */
    .mobile-menu-content a,
    .mobile-menu-btn,
    .nav-logo-link {
      -webkit-touch-callout: none;
      -webkit-user-select: none;
      -khtml-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
    }

    /* Swipe gesture improvements */
    @media (max-width: 768px) {
      body {
        touch-action: pan-y;
      }
      
      .mobile-menu-content {
        touch-action: pan-y;
      }
      
      .mobile-menu-overlay {
        touch-action: pan-y;
      }
    }

    /* Smooth scrolling for mobile */
    html {
      scroll-behavior: smooth;
    }

          /* Better touch targets for mobile */
      @media (max-width: 768px) {
        .button,
        .nav-logo-link,
        .mobile-menu-btn {
          min-height: 44px;
          min-width: 44px;
        }
        
        .mobile-menu-content a {
          min-height: 44px;
          display: flex;
          align-items: center;
        }
        
        /* Prevent horizontal scroll */
        * {
          max-width: 100%;
          box-sizing: border-box;
        }
        
        .card,
        .feature,
        .faq-section {
          width: 100%;
          max-width: 100%;
          box-sizing: border-box;
        }
        
        /* Ensure particles don't cause overflow */
        #particles-bg {
          width: 100vw;
          max-width: 100vw;
          overflow: hidden;
        }
        
        .floating-orb {
          max-width: 100vw;
        }
      }

    .nav-logo-link {
      display: flex;
      align-items: center;
      margin-right: 24px;
      position: relative;
      padding: 0 10px;
      border-radius: 8px;
      transition: all 0.2s ease;
      outline: none;
    }

    .nav-logo-link.active,
    .nav-logo-link:focus,
    .nav-logo-link:hover {
      box-shadow: 0 0 20px rgba(0, 170, 255, 0.6);
      background: rgba(0, 170, 255, 0.1);
      transform: scale(1.05);
    }

    .nav-logo-img {
      width: 100px;
      height: 100px;
      object-fit: contain;
      filter: drop-shadow(0 2px 12px rgba(0, 170, 255, 0.5));
      transition: all 0.2s ease;
      display: block;
    }

    nav a {
      color: var(--primary);
      text-decoration: none;
      margin: 0 18px;
      font-weight: 600;
      font-size: 1.1rem;
      transition: all 0.2s ease;
      position: relative;
      padding: 8px 16px;
      border-radius: 8px;
    }

    nav a.active,
    nav a:focus,
    nav a:hover {
      color: white;
      background: rgba(0, 170, 255, 0.2);
      text-shadow: 0 0 8px var(--primary);
    }

    .robots-anim {
      position: absolute;
      left: 50%;
      top: 100%;
      transform: translateX(-50%);
      display: flex;
      gap: 8px;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.2s;
      z-index: 10;
    }

    .robots-anim.show {
      opacity: 1;
    }

    .robot {
      width: 32px;
      height: 32px;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2300aaff"><path d="M12 2a2 2 0 0 1 2 2v2a2 2 0 0 1-2 2 2 2 0 0 1-2-2V4a2 2 0 0 1 2-2zM4 8a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V8zm12 0a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a2 2 0 0 1-2 2h-2a2 2 0 0 1-2-2V8zM4 16a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2v-2zm12 0a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2a2 2 0 0 1-2 2h-2a2 2 0 0 1-2-2v-2z"/></svg>') no-repeat center/contain;
      animation: robot-run 1.2s cubic-bezier(.7,0,.3,1) forwards;
      opacity: 0;
    }
    .robot.r1 { animation-delay: 0.1s; }
    .robot.r2 { animation-delay: 0.2s; }
    .robot.r3 { animation-delay: 0.3s; }
    .robot.r4 { animation-delay: 0.4s; }

    @keyframes robot-run {
      0% { transform: translateY(0) scale(0.5) rotate(-15deg); opacity: 0; }
      15% { opacity: 1; transform: translateY(-20px) scale(0.8) rotate(-8deg); }
      40% { transform: translateY(-60px) scale(1.2) rotate(5deg); opacity: 1; }
      70% { transform: translateY(-100px) scale(1.1) rotate(2deg); opacity: 1; }
      100% { transform: translateY(-140px) scale(0.9) rotate(0deg); opacity: 0; }
    }

    .grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 60px;
    }

    .card {
      background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
      border: 1px solid rgba(0, 170, 255, 0.2);
      padding: 30px;
      border-radius: 16px;
      width: 100%;
      max-width: 500px;
      text-align: left;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      transform: scaleX(0);
      transition: transform 0.3s ease;
    }

    .card:hover::before {
      transform: scaleX(1);
    }

    .card:hover {
      transform: translateY(-8px) scale(1.02);
      border-color: var(--primary);
      box-shadow: 0 16px 48px rgba(0, 170, 255, 0.2);
    }

    .card h2 {
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: var(--light);
    }

    .card ul,
    .card ol {
      padding-left: 20px;
    }

    .card li {
      margin-bottom: 10px;
      color: #cbd5e1;
    }

    .features {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 40px;
    }

    .feature {
      background: linear-gradient(145deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.8));
      border: 1px solid rgba(0, 170, 255, 0.1);
      border-radius: 16px;
      padding: 25px 20px;
      max-width: 340px;
      min-width: 220px;
      margin-bottom: 20px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .feature::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, rgba(0, 170, 255, 0.1) 0%, transparent 70%);
      transform: scale(0);
      transition: transform 0.3s ease;
    }

    .feature:hover::before {
      transform: scale(1);
    }

    .feature:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0, 170, 255, 0.3);
      border-color: var(--primary);
    }

    .feature h3 {
      color: var(--primary);
      margin-bottom: 15px;
      font-size: 1.3rem;
    }

    .faq-section {
      margin: 80px auto 40px auto;
      max-width: 800px;
      background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
      border-radius: 20px;
      padding: 40px 30px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      border: 1px solid rgba(0, 170, 255, 0.1);
    }

    .faq-title {
      font-size: 2rem;
      margin-bottom: 24px;
      text-align: center;
      color: var(--primary);
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .faq-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .faq-item {
      margin-bottom: 18px;
      border-bottom: 1px solid rgba(0, 170, 255, 0.2);
      padding-bottom: 12px;
      transition: all 0.3s ease;
    }

    .faq-item:hover {
      border-bottom-color: var(--primary);
    }

    .faq-question {
      cursor: pointer;
      font-weight: 600;
      color: var(--light);
      position: relative;
      padding-right: 30px;
      transition: all 0.2s ease;
      padding: 12px 0;
    }

    .faq-question::after {
      content: '+';
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      font-size: 1.3em;
      color: var(--primary);
      transition: all 0.2s ease;
    }

    .faq-item.open .faq-question {
      color: var(--primary);
    }

    .faq-item.open .faq-question::after {
      content: '–';
      transform: translateY(-50%) rotate(180deg);
    }

    .faq-answer {
      display: none;
      color: #cbd5e1;
      margin-top: 8px;
      font-size: 1.05rem;
      line-height: 1.5;
      animation: fadeIn 0.4s ease;
      padding: 0 20px;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(-10px);}
      to { opacity: 1; transform: translateY(0);}
    }

    footer {
      margin-top: 80px;
      text-align: center;
      color: var(--gray);
      font-size: 0.95rem;
      letter-spacing: 0.5px;
    }

    .social-links {
      margin-top: 15px;
      display: flex;
      justify-content: center;
      gap: 15px;
    }

    .social-links a {
      color: var(--primary);
      text-decoration: none;
      font-weight: 600;
      transition: color 0.3s ease;
    }

    .social-links a:hover {
      color: var(--light);
    }

    .logo {
      width: 190px;
      margin: 0 auto 20px;
      display: block;
      filter: drop-shadow(0 2px 12px rgba(0, 170, 255, 0.5));
    }

    /* Robot popup animations */
    .robot-popup {
      position: fixed;
      pointer-events: none;
      z-index: 1000;
      opacity: 0;
      transition: all 0.3s ease;
    }

    .robot-popup.show {
      opacity: 1;
    }

    .robot-popup svg {
      width: 40px;
      height: 40px;
      filter: drop-shadow(0 2px 8px rgba(0, 170, 255, 0.6));
    }

    @keyframes robot-bounce {
      0%, 100% { transform: translateY(0) scale(1); }
      50% { transform: translateY(-20px) scale(1.1); }
    }

    @keyframes robot-spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    @keyframes robot-pulse {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.2); opacity: 0.8; }
    }

    /* Interactive elements */
    .interactive {
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .interactive:hover {
      transform: scale(1.05);
    }

    /* Tablet styles */
    @media (max-width: 1024px) {
      .container {
        padding: 30px 15px;
      }
      
      h1 {
        font-size: 3rem;
      }
      
      .nav-logo-img {
        width: 80px;
        height: 80px;
      }
      
      .card {
        max-width: 100%;
        margin-bottom: 20px;
      }
      
      .features {
        gap: 20px;
      }
      
      .feature {
        max-width: 100%;
        min-width: auto;
      }
    }

    /* Large mobile styles */
    @media (max-width: 900px) {
      .grid {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 20px;
      }
      
      .card {
        flex: 1;
        min-width: 300px;
        max-width: calc(50% - 10px);
      }
    }

    /* Mobile styles */
    @media (max-width: 768px) {
      html, body {
        overflow-x: hidden;
        width: 100%;
        max-width: 100%;
      }
      
      .container {
        padding: 20px 15px;
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
      }
      
      /* Show mobile menu button */
      .mobile-menu-btn {
        display: flex;
        position: fixed;
        right: 15px;
        top: 20px;
        z-index: 1002;
      }
      
      /* Hide desktop navigation */
      nav a:not(.nav-logo-link) {
        display: none;
      }
      
      /* Adjust logo for mobile */
      .nav-logo-link {
        margin: 0;
      }
      
      .nav-logo-img {
        width: 60px;
        height: 60px;
      }
      
      /* Typography adjustments */
      h1 {
        font-size: 1.8rem;
        line-height: 1.2;
        margin-bottom: 15px;
      }
      
      h2 {
        font-size: 1.6rem;
        margin-bottom: 15px;
      }
      
      p.lead {
        font-size: 1.1rem;
        margin-bottom: 25px;
      }
      
      /* Layout adjustments */
      .grid {
        flex-direction: column;
        gap: 20px;
        margin-top: 40px;
        align-items: center;
      }
      
      .features {
        flex-direction: column;
        gap: 20px;
        margin-top: 30px;
      }
      
      .card {
        padding: 20px;
        margin-bottom: 15px;
      }
      
      .feature {
        padding: 20px 15px;
        margin-bottom: 15px;
      }
      
      .faq-section {
        padding: 20px 15px;
        margin: 60px auto 30px auto;
      }
      
      .faq-title {
        font-size: 1.6rem;
        margin-bottom: 20px;
      }
      
      .faq-question {
        font-size: 1rem;
        padding: 10px 0;
      }
      
      .faq-answer {
        font-size: 0.95rem;
        padding: 0 15px;
      }
      
      /* Button adjustments */
      .button {
        padding: 12px 25px;
        font-size: 1.1rem;
        margin-top: 15px;
      }
      
      /* Footer adjustments */
      footer {
        margin-top: 60px;
        font-size: 0.9rem;
      }

      .logo {
        width: 150px;
      }

      .social-links {
        flex-direction: column;
        gap: 10px;
      }
      
      /* Particle system adjustments */
      .particle.xlarge {
        display: none;
      }
      
      .particle.large {
        width: 8px;
        height: 8px;
      }
    }

    /* Small mobile styles */
    @media (max-width: 480px) {
      .container {
        padding: 15px 10px;
      }
      
      /* Make menu button even more compact */
      .mobile-menu-btn {
        width: 20px;
        height: 20px;
      }
      
      .mobile-menu-btn::before,
      .mobile-menu-btn::after {
        width: 14px;
        height: 1.5px;
        left: 3px;
      }
      
      .mobile-menu-btn::before {
        top: 6px;
        box-shadow: 0 5px 0 var(--primary);
      }
      
      .mobile-menu-btn::after {
        top: 16px;
      }
      
      .mobile-menu-btn.active::before,
      .mobile-menu-btn.active::after {
        top: 9px;
        left: 3px;
      }
      
      h1 {
        font-size: 1.6rem;
      }
      
      h2 {
        font-size: 1.4rem;
      }
      
      p.lead {
        font-size: 1rem;
      }
      
      .nav-logo-img {
        width: 50px;
        height: 50px;
      }
      
      .card {
        padding: 15px;
      }
      
      .feature {
        padding: 15px 10px;
      }
      
      .faq-section {
        padding: 15px 10px;
      }
      
      .button {
        padding: 10px 20px;
        font-size: 1rem;
      }
      
      /* Hide medium particles on very small screens */
      .particle.medium {
        display: none;
      }
    }

    /* Landscape mobile adjustments */
    @media (max-width: 768px) and (orientation: landscape) {
      .container {
        padding: 15px 20px;
      }
      
      h1 {
        font-size: 2rem;
        margin-bottom: 10px;
      }
      
      .grid {
        margin-top: 20px;
      }
      
      .features {
        margin-top: 20px;
      }
    }

    /* Very narrow screens */
    @media (max-width: 360px) {
      .mobile-menu-content {
        width: 260px;
        max-width: 90vw;
        padding: 70px 20px 20px;
      }
      
      .mobile-menu-btn {
        width: 28px;
        height: 28px;
      }
      
      .mobile-menu-btn::before,
      .mobile-menu-btn::after {
        width: 14px;
        height: 1.5px;
      }
    }

    /* Mentors Section Styles */
    .mentors-section {
      margin: 80px auto;
      max-width: 1000px;
      text-align: center;
    }

    .mentors-container {
      position: relative;
      height: 400px;
      margin: 40px 0;
      overflow: hidden;
    }

    .mentor-card {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 100%;
      max-width: 500px;
      background: linear-gradient(145deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
      border: 1px solid rgba(0, 170, 255, 0.2);
      border-radius: 20px;
      padding: 40px 30px;
      text-align: center;
      opacity: 0;
      visibility: hidden;
      transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    .mentor-card.active {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) scale(1);
    }

    .mentor-card:not(.active) {
      transform: translateX(-50%) scale(0.8);
    }

    .mentor-avatar {
      margin-bottom: 20px;
    }

    .avatar-circle {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.5rem;
      margin: 0 auto;
      box-shadow: 0 4px 20px rgba(0, 170, 255, 0.3);
      animation: avatar-pulse 2s ease-in-out infinite;
    }

    @keyframes avatar-pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.05); }
    }

    .mentor-card h3 {
      color: var(--primary);
      font-size: 1.8rem;
      margin-bottom: 10px;
    }

    .mentor-type {
      color: var(--accent);
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 20px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .mentor-quote {
      background: rgba(0, 170, 255, 0.1);
      border-left: 3px solid var(--primary);
      padding: 20px;
      border-radius: 10px;
      margin-top: 20px;
    }

    .mentor-quote p {
      font-size: 1.1rem;
      font-style: italic;
      color: var(--light);
      margin: 0;
      line-height: 1.6;
    }

    .mentors-nav {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }

    .mentor-nav-btn {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 2px solid rgba(0, 170, 255, 0.3);
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .mentor-nav-btn:hover,
    .mentor-nav-btn.active {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
      transform: scale(1.1);
    }

    /* Mentors responsive */
    @media (max-width: 768px) {
      .mentors-container {
        height: 350px;
      }
      
      .mentor-card {
        padding: 30px 20px;
      }
      
      .avatar-circle {
        width: 60px;
        height: 60px;
        font-size: 2rem;
      }
      
      .mentor-card h3 {
        font-size: 1.5rem;
      }
      
      .mentor-quote p {
        font-size: 1rem;
      }
      
      /* Mobile language switcher */
      .mobile-language-switcher {
        display: flex;
        justify-content: center;
        gap: 10px;
        margin-top: 30px;
        padding-top: 20px;
        border-top: 1px solid rgba(0, 170, 255, 0.2);
      }
      
      .mobile-lang-btn {
        background: transparent;
        border: 1px solid rgba(0, 170, 255, 0.3);
        color: var(--primary);
        padding: 8px 15px;
        border-radius: 6px;
        cursor: pointer;
        font-size: 0.9rem;
        font-weight: 600;
        transition: all 0.3s ease;
        min-width: 40px;
      }
      
      .mobile-lang-btn:hover {
        background: rgba(0, 170, 255, 0.1);
        border-color: var(--primary);
        transform: scale(1.05);
      }
      
      .mobile-lang-btn.active {
        background: var(--primary);
        color: white;
        border-color: var(--primary);
      }
    }

/* Mobile menu button redesign */
.mobile-menu-btn {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: rgba(2, 6, 23, 0.8);
  border: 1px solid rgba(0, 170, 255, 0.2);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
  z-index: 1002;
}

/* remove old pseudo elements */
.mobile-menu-btn::before,
.mobile-menu-btn::after {
  content: none;
}

.mobile-menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu-btn:hover {
  background: rgba(2, 6, 23, 0.9);
}