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

    :root {
      --primary: #FF6B6B;
      --primary-dark: #EE5A5A;
      --primary-light: #FF8787;
      --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --accent: #4ECDC4;
      --accent-light: #6EE7DF;
      --text-dark: #2D3436;
      --text-light: #636E72;
      --border: #DFE6E9;
      --white: #FFFFFF;
      --error: #FF6B6B;
      --success: #6BCF7F;
      --bg-light: #F8F9FA;
    }

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #0a0a0a;
      min-height: 100vh;
      display: flex;
      padding: 20px;
      position: relative;
      overflow-x: hidden;
      overflow-y: auto;
    }

    /* Neural Network Canvas */
    #neuralCanvas {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
    }

    /* Animated gradient overlay */
    .gradient-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(45deg, 
        rgba(102, 126, 234, 0.1) 0%, 
        rgba(118, 75, 162, 0.1) 25%,
        rgba(255, 107, 107, 0.1) 50%,
        rgba(78, 205, 196, 0.1) 75%,
        rgba(102, 126, 234, 0.1) 100%);
      background-size: 400% 400%;
      animation: gradientShift 15s ease infinite;
      z-index: 0;
    }

    @keyframes gradientShift {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    /* Floating particles */
    .particle {
      position: fixed;
      width: 4px;
      height: 4px;
      background: rgba(255, 255, 255, 0.6);
      border-radius: 50%;
      pointer-events: none;
      z-index: 1;
    }

    .login-container {
      width: 100%;
      max-width: 550px;
      position: relative;
      z-index: 1;
      margin: auto;
    }

    .login-card {
      background: var(--white);
      border-radius: 24px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
      overflow: hidden;
      animation: slideUp 0.5s ease-out;
      transition: transform 0.3s ease;
    }

    .login-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 25px 70px rgba(0, 0, 0, 0.3);
    }

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

    .login-header {
      background: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
      padding: 40px 30px;
      text-align: center;
      color: var(--white);
      position: relative;
      overflow: hidden;
    }

    .login-header::before {
      content: '😊';
      position: absolute;
      font-size: 100px;
      opacity: 0.1;
      top: -20px;
      right: -20px;
      animation: rotate 10s linear infinite;
    }

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

    .logo {
      width: 80px;
      height: 80px;
      background: rgba(255, 255, 255, 0.25);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 40px;
      backdrop-filter: blur(10px);
      border: 3px solid rgba(255, 255, 255, 0.4);
      animation: pulse 2s ease-in-out infinite;
      transition: transform 0.3s ease;
    }

    .logo:hover {
      transform: scale(1.1) rotate(10deg);
    }

    @keyframes pulse {
      0%, 100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7); }
      50% { box-shadow: 0 0 0 15px rgba(255, 255, 255, 0); }
    }

    .login-header h1 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .login-header p {
      font-size: 14px;
      opacity: 0.9;
    }

    .login-body {
      padding: 40px 30px;
    }

    .form-group {
      margin-bottom: 24px;
    }

    .form-group label {
      display: block;
      margin-bottom: 8px;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 14px;
    }

    .input-wrapper {
      position: relative;
    }

    .toggle-password {
      position: absolute;
      right: 16px;
      top: 50%;
      transform: translateY(-50%);
      background: none;
      border: none;
      cursor: pointer;
      font-size: 18px;
      color: var(--text-light);
      padding: 5px;
      transition: all 0.3s ease;
      z-index: 10;
    }

    .toggle-password:hover {
      color: var(--primary);
      transform: translateY(-50%) scale(1.2);
    }

    .toggle-password:active {
      transform: translateY(-50%) scale(0.9);
    }

    .input-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-light);
      font-size: 18px;
    }

    .form-control {
      width: 100%;
      padding: 14px 48px 14px 48px;
      border: 2px solid var(--border);
      border-radius: 12px;
      font-size: 15px;
      transition: all 0.3s ease;
      background: var(--bg-light);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: var(--white);
      box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.15);
      transform: translateY(-2px);
    }

    .form-control:hover {
      border-color: var(--primary-light);
    }

    .form-control::placeholder {
      color: #9CA3AF;
    }

    .remember-forgot {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
    }

    .checkbox-wrapper {
      display: flex;
      align-items: center;
    }

    .checkbox-wrapper input[type="checkbox"] {
      width: 18px;
      height: 18px;
      margin-right: 8px;
      cursor: pointer;
      accent-color: var(--primary);
    }

    .checkbox-wrapper label {
      font-size: 14px;
      color: var(--text-dark);
      cursor: pointer;
      user-select: none;
    }

    .forgot-link {
      font-size: 14px;
      color: var(--primary);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s ease;
    }

    .forgot-link:hover {
      color: var(--primary-dark);
    }

    .btn-login {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: var(--white);
      border: none;
      border-radius: 12px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
      position: relative;
      overflow: hidden;
    }

    .btn-login::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
      transition: left 0.5s ease;
    }

    .btn-login:hover::before {
      left: 100%;
    }

    .btn-login:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 25px rgba(255, 107, 107, 0.5);
    }

    .btn-login:active {
      transform: translateY(-1px);
      box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
    }

    .register-link {
      text-align: center;
      margin-top: 24px;
      padding-top: 24px;
      border-top: 1px solid var(--border);
    }

    .register-link p {
      color: var(--text-light);
      font-size: 14px;
    }

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

    .register-link a:hover {
      color: var(--primary-dark);
    }

    /* Responsive Design */
    @media (max-width: 480px) {
      .login-container {
        max-width: 100%;
      }

      .login-card {
        border-radius: 16px;
      }

      .login-header {
        padding: 30px 20px;
      }

      .logo {
        width: 70px;
        height: 70px;
        font-size: 32px;
      }

      .login-header h1 {
        font-size: 24px;
      }

      .login-body {
        padding: 30px 20px;
      }

      .form-control {
        padding: 12px 14px 12px 44px;
        font-size: 14px;
      }

      .input-icon {
        font-size: 16px;
        left: 14px;
      }

      .remember-forgot {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
      }
    }

    /* PWA Enhancements */
    @media (display-mode: standalone) {
      body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
      }
    }

    /* Icons (using simple SVG as text) */
    .icon-email::before {
      content: '📧';
    }

    .icon-lock::before {
      content: '🔐';
    }

    .icon-eye::before {
      content: '👁️';
    }

    .icon-eye-slash::before {
      content: '🙈';
    }

    /* Loading animation */
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    .btn-login.loading::after {
      content: '⏳';
      margin-left: 10px;
      display: inline-block;
      animation: spin 1s linear infinite;
    }