:root {
     --primary: #25D366;
     --secondary: #1e293b;
     --bg: #f8fafc;
     --white: #ffffff;
     --border: #e2e8f0;
 }

 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
     font-family: 'Inter', sans-serif;
 }

 body {
     background-color: var(--bg);
     display: flex;
     justify-content: center;
     align-items: center;
     min-height: 100vh;
 }

 .auth-card {
     background: var(--white);
     padding: 2.5rem;
     border-radius: 20px;
     box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
     width: 100%;
     max-width: 400px;
     border: 1px solid var(--border);
 }

 .auth-header {
     text-align: center;
     margin-bottom: 2rem;
 }

 .auth-header h1 {
     font-size: 1.5rem;
     color: var(--secondary);
     margin-bottom: 0.5rem;
 }

 .auth-header p {
     color: #64748b;
     font-size: 0.9rem;
 }

 .form-group {
     margin-bottom: 1.2rem;
 }

 .form-group label {
     display: block;
     font-size: 0.85rem;
     font-weight: 600;
     margin-bottom: 0.5rem;
     color: var(--secondary);
 }

 .input-wrapper {
     position: relative;
 }

 .input-wrapper i {
     position: absolute;
     left: 12px;
     top: 50%;
     transform: translateY(-50%);
     color: #94a3b8;
 }

 input {
     width: 100%;
     padding: 12px 12px 12px 40px;
     border: 1.5px solid var(--border);
     border-radius: 10px;
     outline: none;
     transition: 0.3s;
 }

 input:focus {
     border-color: var(--primary);
     box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.1);
 }

 .btn-auth {
     width: 100%;
     background: var(--primary);
     color: white;
     padding: 14px;
     border: none;
     border-radius: 10px;
     font-weight: 700;
     cursor: pointer;
     transition: 0.3s;
     margin-top: 1rem;
 }

 .btn-auth:hover {
     background: #1eb956;
     transform: translateY(-2px);
 }

 .auth-footer {
     text-align: center;
     margin-top: 1.5rem;
     font-size: 0.85rem;
     color: #64748b;
 }

 .auth-footer a {
     color: var(--primary);
     text-decoration: none;
     font-weight: 700;
 }