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

  body {
      font-family: 'Exo 2', sans-serif;
      background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      overflow-x: hidden;
  }

  /* Background Animation */
  body::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background:
          radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
          radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.1) 0%, transparent 50%);
      animation: backgroundPulse 10s ease-in-out infinite alternate;
      pointer-events: none;
  }

  @keyframes backgroundPulse {
      0% {
          opacity: 0.5;
      }

      100% {
          opacity: 1;
      }
  }

  .container {
      position: relative;
      z-index: 1;
      width: 100%;
      max-width: 450px;
      padding: 20px;
  }

  .logo {
      text-align: center;
      margin-bottom: 40px;
  }

  .logo-text {
      font-family: 'Orbitron', monospace;
      font-size: 2.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, #949494, #ffffff, #9b9b9b);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
      letter-spacing: 3px;
  }

  .auth-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(20px);
      border-radius: 20px;
      padding: 40px;
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow:
          0 25px 45px rgba(0, 0, 0, 0.3),
          0 0 80px rgba(0, 212, 255, 0.1);
      position: relative;
      overflow: hidden;
  }

  .auth-card::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 0.5s;
  }

  .auth-card:hover::before {
      left: 100%;
  }

  .auth-tabs {
      display: flex;
      margin-bottom: 30px;
      background: rgba(0, 0, 0, 0.2);
      border-radius: 12px;
      padding: 4px;
  }

  .tab-button {
      flex: 1;
      padding: 12px 20px;
      background: transparent;
      border: none;
      color: #9ca3af;
      font-family: 'Orbitron', monospace;
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      border-radius: 8px;
      transition: all 0.3s ease;
      letter-spacing: 1px;
  }

  .tab-button.active {
      background: linear-gradient(135deg, #00d4ff, #4ecdc4);
      color: white;
      box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
  }

  .form-group {
      margin-bottom: 25px;
      position: relative;
  }

  .form-label {
      display: block;
      margin-bottom: 8px;
      font-family: 'Orbitron', monospace;
      font-size: 12px;
      font-weight: 600;
      color: #00d4ff;
      letter-spacing: 1px;
      text-transform: uppercase;
  }

  .form-input {
      width: 100%;
      padding: 15px 20px;
      background: rgba(0, 0, 0, 0.3);
      border: 2px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
      color: white;
      font-size: 16px;
      font-family: 'Exo 2', sans-serif;
      transition: all 0.3s ease;
      outline: none;
  }

  .form-input::placeholder {
      color: #6b7280;
  }

  .form-input:focus {
      border-color: #00d4ff;
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
      background: rgba(0, 0, 0, 0.4);
  }

  .btn {
      width: 100%;
      padding: 16px;
      background: linear-gradient(135deg, #00d4ff, #4ecdc4);
      border: none;
      border-radius: 12px;
      color: white;
      font-family: 'Orbitron', monospace;
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 2px;
      text-transform: uppercase;
      cursor: pointer;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
  }

  .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(0, 212, 255, 0.3);
  }

  .btn:active {
      transform: translateY(0);
  }

  .btn:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
  }

  .error-message {
      background: rgba(255, 107, 107, 0.1);
      border: 1px solid rgba(255, 107, 107, 0.3);
      color: #ff6b6b;
      padding: 12px 16px;
      border-radius: 8px;
      margin-bottom: 20px;
      font-size: 14px;
      animation: errorShake 0.5s ease-in-out;
  }

  .success-message {
      background: rgba(78, 205, 196, 0.1);
      border: 1px solid rgba(78, 205, 196, 0.3);
      color: #4ecdc4;
      padding: 12px 16px;
      border-radius: 8px;
      margin-bottom: 20px;
      font-size: 14px;
  }

  @keyframes errorShake {

      0%,
      100% {
          transform: translateX(0);
      }

      25% {
          transform: translateX(-5px);
      }

      75% {
          transform: translateX(5px);
      }
  }

  .back-link {
      text-align: center;
      margin-top: 30px;
  }

  .back-link a {
      color: #9ca3af;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.3s ease;
  }

  .back-link a:hover {
      color: #00d4ff;
  }

  .loading-spinner {
      display: inline-block;
      width: 20px;
      height: 20px;
      border: 2px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: white;
      animation: spin 1s ease-in-out infinite;
      margin-right: 8px;
  }

  @keyframes spin {
      to {
          transform: rotate(360deg);
      }
  }

  /* Responsive Design */
  @media (max-width: 480px) {
      .container {
          padding: 15px;
      }

      .auth-card {
          padding: 30px 25px;
      }

      .logo-text {
          font-size: 2rem;
      }
  }