:root {
      --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
      --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
      --dark-bg: linear-gradient(135deg, #212122 0%, #212160 100%);
      --glass-bg: rgba(255, 255, 255, 0.1);
      --glass-border: rgba(255, 255, 255, 0.2);
      --text-light: #ffffff;
      --text-dark: #2c3e50;
      --shadow-light: 0 8px 32px rgba(31, 38, 135, 0.37);
      --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.3);
    }

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

    html,
    body {
      width: 100%;
      height: 100%;
      font-family: 'Poppins', sans-serif;
      background: var(--dark-bg);
      color: var(--text-light);
      overflow-x: hidden;
    }

    /* Animated Background */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background:
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
      animation: backgroundShift 10s ease-in-out infinite alternate;
      z-index: -1;
    }

    @keyframes backgroundShift {
      0% {
        transform: translateX(-20px) translateY(-20px);
      }

      100% {
        transform: translateX(20px) translateY(20px);
      }
    }

    /* Enhanced Preloader */
    #preloader {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--dark-bg);
      z-index: 9999;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .loader {
      width: 120px;
      height: 120px;
      position: relative;
      margin-bottom: 2rem;
    }

    .loader-dot {
      position: absolute;
      width: 20px;
      height: 20px;
      background: var(--secondary-gradient);
      border-radius: 50%;
      box-shadow: 0 0 20px rgba(245, 87, 108, 0.5);
      animation: loaderPulse 2s infinite ease-in-out;
    }

    .loader-dot:nth-child(1) {
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      animation-delay: 0s;
    }

    .loader-dot:nth-child(2) {
      top: 50%;
      right: 0;
      transform: translateY(-50%);
      animation-delay: 0.5s;
    }

    .loader-dot:nth-child(3) {
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      animation-delay: 1s;
    }

    .loader-dot:nth-child(4) {
      top: 50%;
      left: 0;
      transform: translateY(-50%);
      animation-delay: 1.5s;
    }

    @keyframes loaderPulse {

      0%,
      100% {
        transform: scale(0.5);
        opacity: 0.5;
      }

      50% {
        transform: scale(1.2);
        opacity: 1;
      }
    }

    .loader-text {
      font-size: 1.2rem;
      font-weight: 300;
      text-align: center;
      opacity: 0.8;
      animation: textFade 2s infinite ease-in-out;
    }

    @keyframes textFade {

      0%,
      100% {
        opacity: 0.5;
      }

      50% {
        opacity: 1;
      }
    }

    /* Glass morphism header */
    .header {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      padding: 0.5rem 0;
      margin: 0.5rem auto;
      max-width: 660px;
      border-radius: 20px;
      box-shadow: var(--shadow-light);
      position: relative;
      overflow: hidden;
    }

    .header::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
      animation: shimmer 3s infinite;
    }

    @keyframes shimmer {
      0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
      }

      100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
      }
    }

    .header h1 {
      font-size: 1.5rem;
      font-weight: 700;
      background: var(--secondary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin: 0;
      position: relative;
      z-index: 2;
      text-align: center;
      animation: titleFloat 3s ease-in-out infinite alternate;
    }

    @keyframes titleFloat {
      0% {
        transform: translateY(0px);
      }

      100% {
        transform: translateY(-10px);
      }
    }

    .header-decoration {
      width: 100px;
      height: 4px;
      background: var(--secondary-gradient);
      margin: 1rem auto 0;
      border-radius: 2px;
      animation: decorationPulse 2s ease-in-out infinite alternate;
    }

    @keyframes decorationPulse {
      0% {
        transform: scaleX(1);
      }

      100% {
        transform: scaleX(1.5);
      }
    }

    /* Enhanced section */
    .section {
      margin: 1rem auto;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1rem;
    }

    .section-message {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      padding: 1rem 2rem;
      border-radius: 15px;
      font-size: 1.1rem;
      font-weight: 500;
      box-shadow: var(--shadow-light);
      min-height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .section-canvas {
      border-radius: 20px;
      box-shadow: var(--shadow-heavy);
      border: 3px solid var(--glass-border);
      transition: all 0.3s ease;
      position: relative;
    }

    .section-canvas:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }

    /* Mode chooser with enhanced glass morphism */
    .mode,
    .message {
      position: fixed;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      z-index: 100;
      display: flex;
      justify-content: center;
      align-items: center;
      background: rgba(0, 0, 0, 0.8);
      backdrop-filter: blur(5px);
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .mode-chooser,
    .message-body {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 25px;
      padding: 2rem;
      box-shadow: var(--shadow-heavy);
      text-align: center;
      position: relative;
      overflow: hidden;
      animation: modalSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }

    @keyframes modalSlideIn {
      0% {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
      }

      100% {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    /* Logo animation */
    .logo-animation {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: 0.5rem;
      gap: 8px;
    }

    .circle {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      animation: circleFloat 2s ease-in-out infinite;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    }

    .circle.red {
      background: var(--danger-gradient);
    }

    .circle.yellow {
      background: var(--success-gradient);
    }

    .circle:nth-child(odd) {
      animation-delay: 0s;
    }

    .circle:nth-child(even) {
      animation-delay: 0.3s;
    }

    @keyframes circleFloat {

      0%,
      100% {
        transform: translateY(0px);
      }

      50% {
        transform: translateY(-15px);
      }
    }

    .mode-chooser h1 {
      font-size: 1.5rem;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 0.5rem;
    }

    .welcome-text {
      font-size: 1.1rem;
      font-weight: 300;
      opacity: 0.9;
      margin-bottom: 2rem;
      line-height: 1.6;
    }

    .game-rules {
      margin-bottom: 1rem;
    }

    .game-rules details {
      background: rgba(255, 255, 255, 0.05);
      border-radius: 10px;
      padding: 0.5rem;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .game-rules details:hover {
      background: rgba(255, 255, 255, 0.1);
    }

    .game-rules summary {
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    .game-rules p {
      font-size: 0.9rem;
      line-height: 1.5;
      opacity: 0.8;

      max-width: 490px;
    }

    .game-rules a {
      color: #4facfe;
      text-decoration: none;
      font-weight: 500;
    }

    .game-rules a:hover {
      text-decoration: underline;
    }

    .mode-chooser h2 {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      background: var(--secondary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* Enhanced mode options */
    .mode-options {
      display: flex;
      flex-direction: column;
      gap: 1rem;
      margin-bottom: 1rem;
    }

    .mode-option {
      position: relative;
      cursor: pointer;
      display: block;
    }

    .mode-option input {
      position: absolute;
      opacity: 0;
      pointer-events: none;
    }

    .option-content {
      display: flex;
      align-items: center;
      padding: 0.5rem;
      background: rgba(255, 255, 255, 0.05);
      border: 2px solid transparent;
      border-radius: 15px;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      position: relative;
      overflow: hidden;
    }

    .option-content::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
      transition: left 0.6s ease;
    }

    .mode-option:hover .option-content::before {
      left: 100%;
    }

    .mode-option:hover .option-content {
      background: rgba(255, 255, 255, 0.1);
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    }

    .mode-option input:checked+.option-content {
      background: var(--primary-gradient);
      border-color: rgba(255, 255, 255, 0.3);
      box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    }

    .option-icon {
      font-size: 2rem;
      margin-right: 1rem;
      filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
    }

    .option-text {
      font-size: 1.2rem;
      font-weight: 600;
      flex: 1;
      text-align: left;
    }

    /* Enhanced button */
    .mode-chooser-submit {
      background: var(--secondary-gradient);
      border: none;
      padding: 1rem 3rem;
      border-radius: 50px;
      font-size: 1.2rem;
      font-weight: 600;
      color: white;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 0 8px 25px rgba(245, 87, 108, 0.3);
      position: relative;
      overflow: hidden;
    }

    .mode-chooser-submit::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 0.6s ease;
    }

    .mode-chooser-submit:hover::before {
      left: 100%;
    }

    .mode-chooser-submit:hover {
      transform: translateY(-3px) scale(1.05);
      box-shadow: 0 15px 35px rgba(245, 87, 108, 0.4);
    }

    .mode-chooser-submit:active {
      transform: translateY(-1px) scale(1.02);
    }

    .pulse {
      animation: buttonPulse 2s infinite;
    }

    @keyframes buttonPulse {
      0% {
        box-shadow: 0 8px 25px rgba(245, 87, 108, 0.3);
      }

      50% {
        box-shadow: 0 8px 35px rgba(245, 87, 108, 0.5);
      }

      100% {
        box-shadow: 0 8px 25px rgba(245, 87, 108, 0.3);
      }
    }

    /* Message body enhancements */
    .message-body-content {
      margin-bottom: 2rem;
      font-size: 1.1rem;
      line-height: 1.6;
    }

    .message-body-dismiss {
      background: var(--success-gradient);
      border: none;
      padding: 0.8rem 2rem;
      border-radius: 25px;
      font-size: 1rem;
      font-weight: 600;
      color: white;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
    }

    .message-body-dismiss:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(79, 172, 254, 0.4);
    }

    /* Footer */
    .footer {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border-top: 1px solid var(--glass-border);
      padding: 2rem 0;
      margin-top: 4rem;
      font-size: 0.9rem;
      opacity: 0.8;
    }

    /* Utility classes */
    .invisible {
      opacity: 0;
      pointer-events: none;
    }

    .hidden {
      display: none;
    }

    /* Win animations */
    @keyframes winPulse {
      0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0.7);
      }
      50% {
        transform: scale(1.2);
        box-shadow: 0 0 0 10px rgba(255, 215, 0, 0);
      }
      100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0);
      }
    }

    @keyframes winBounce {
      0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
      }
      40% {
        transform: translateY(-20px);
      }
      60% {
        transform: translateY(-10px);
      }
    }

    @keyframes winRotate {
      from {
        transform: rotate(0deg);
      }
      to {
        transform: rotate(360deg);
      }
    }

    @keyframes winGlow {
      0%, 100% {
        box-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
      }
      50% {
        box-shadow: 0 0 40px rgba(255, 215, 0, 1), 0 0 60px rgba(255, 215, 0, 0.5);
      }
    }

    @keyframes confettiExplosion {
      0% {
        opacity: 1;
        transform: scale(1) translateY(0) rotate(0deg);
      }
      100% {
        opacity: 0;
        transform: scale(0.5) translateY(-200px) rotate(720deg);
      }
    }

    .confetti {
      position: absolute;
      width: 10px;
      height: 10px;
      pointer-events: none;
      z-index: 1000;
    }

    /* Responsive design */
    @media (max-width: 768px) {
      .header h1 {
        font-size: 2rem;
      }

      .mode-chooser,
      .message-body {
        padding: 2rem;
        margin: 1rem;
      }

      .mode-chooser h1 {
        font-size: 2rem;
      }

      .option-content {
        padding: 1rem;
      }

      .option-icon {
        font-size: 1.5rem;
      }

      .option-text {
        font-size: 1rem;
      }
    }

    /* Particle effect */
    .particles {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: -1;
    }

    .particle {
      position: absolute;
      width: 4px;
      height: 4px;
      background: rgba(255, 255, 255, 0.5);
      border-radius: 50%;
      animation: particleFloat 6s infinite linear;
    }

    @keyframes particleFloat {
      0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
      }

      10% {
        opacity: 1;
      }

      90% {
        opacity: 1;
      }

      100% {
        transform: translateY(-10vh) rotate(360deg);
        opacity: 0;
      }
    }