:root {
      --primary: #4361ee;
      --primary-light: #4895ef;
      --secondary: #3f37c9;
      --accent: #4cc9f0;
      --dark: #1a1a2e;
      --light: #f8f9fa;
      --success: #4ade80;
      --warning: #fbbf24;
      --error: #f87171;
      --radius: 12px;
      --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: 'Inter', sans-serif;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 1rem;
      color: var(--dark);
      line-height: 1.6;
      animation: fadeIn 0.8s ease-out;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .card {
      background: white;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow: hidden;
      transition: var(--transition);
      animation: slideUp 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
      max-width: 500px;
      margin: 0 auto;
    }

    @keyframes slideUp {
      from { 
        opacity: 0;
        transform: translateY(40px) scale(0.95);
      }
      to { 
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    .card-header {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 1.5rem;
      text-align: center;
    }

    .card-title {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    .card-subtitle {
      font-size: 1rem;
      opacity: 0.9;
      font-weight: 400;
    }

    .card-body {
      padding: 2rem;
    }

    .welcome-back {
      text-align: center;
      margin-bottom: 1.5rem;
      animation: fadeIn 0.6s ease-out;
    }

    .welcome-back h3 {
      color: var(--dark);
      margin-bottom: 1rem;
    }

    .welcome-back span {
      color: var(--primary);
      font-weight: 600;
    }

    .divider {
      display: flex;
      align-items: center;
      margin: 1.5rem 0;
      color: #64748b;
    }

    .divider::before, .divider::after {
      content: "";
      flex: 1;
      height: 1px;
      background: #e2e8f0;
    }

    .divider-text {
      padding: 0 1rem;
      font-size: 0.875rem;
    }

    .form-group {
      margin-bottom: 1.5rem;
      opacity: 0;
      animation: fadeIn 0.5s ease-out forwards;
    }

    .form-group:nth-child(1) { animation-delay: 0.2s; }
    .form-group:nth-child(2) { animation-delay: 0.3s; }

    label {
      display: block;
      margin-bottom: 0.5rem;
      font-weight: 500;
      color: var(--dark);
    }

    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius);
      font-size: 1rem;
      transition: var(--transition);
      background-color: #f8fafc;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
      background-color: white;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.5rem;
      border-radius: var(--radius);
      font-size: 1rem;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      color: white;
      width: 100%;
      box-shadow: var(--shadow);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
    }
    .btn-secondary {
      background: linear-gradient(135deg, #34a1b6, #2d8da0);
    }
    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      opacity: 0.95;
    }
    .btn:active {
      transform: translateY(0);
    }
    .link {
      color: var(--primary);
      text-decoration: none;
      font-weight: 500;
      transition: var(--transition);
    }
    .link:hover {
      color: var(--secondary);
      text-decoration: underline;
    }
    .text-center {
      text-align: center;
    }
    .mt-3 {
      margin-top: 1rem;
    }

    .invalid {
      border-color: var(--error) !important;
      background-color: #fff5f5 !important;
    }
    .error-text {
      color: var(--error);
      font-size: 0.875rem;
      margin-top: 0.25rem;
      display: block;
    }
    @media (max-width: 768px) {
      .card-body {
        padding: 1.5rem;
      }
      .card-title {
        font-size: 1.25rem;
      }
    }
    .loader{
      display: none;
    }
    .loader {
      width: 24px;
      height: 24px;
      border: 3px 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); }