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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 500px;
}

.auth-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

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

.auth-header {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.auth-header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.auth-header h2 {
    font-size: 1.8em;
    margin-bottom: 10px;
    font-weight: 300;
}

.auth-header p {
    font-size: 1.1em;
    opacity: 0.9;
    font-weight: 300;
}

.auth-form {
    padding: 40px 30px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
    font-size: 1em;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input:focus {
    outline: none;
    border-color: #4CAF50;
    background: white;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
    transform: translateY(-1px);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #6c757d;
    font-size: 0.9em;
}

.btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 10px 0;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #6c757d, #5a6268);
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.4);
}

.auth-links {
    padding: 20px 30px;
    background: #f8f9fa;
    text-align: center;
    border-top: 1px solid #e9ecef;
}

.auth-links p {
    margin: 10px 0;
    color: #6c757d;
}

.auth-links a {
    color: #4CAF50;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-links a:hover {
    color: #45a049;
    text-decoration: underline;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
    border-left: 5px solid #dc3545;
    animation: shake 0.5s ease-in-out;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
    border-left: 5px solid #28a745;
    animation: slideDown 0.5s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading state */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Responsive */
@media (max-width: 600px) {
    .auth-container {
        margin: 10px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .auth-header {
        padding: 30px 20px;
    }
    
    .auth-header h1 {
        font-size: 2em;
    }
    
    .auth-header h2 {
        font-size: 1.5em;
    }
    
    .auth-form {
        padding: 30px 20px;
    }
    
    .auth-links {
        padding: 15px 20px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .auth-card {
        background: #2d3748;
        color: #e2e8f0;
    }
    
    .form-group input {
        background: #4a5568;
        border-color: #6b7280;
        color: #e2e8f0;
    }
    
    .form-group input:focus {
        background: #4a5568;
        border-color: #4CAF50;
    }
    
    .auth-links {
        background: #4a5568;
        border-color: #6b7280;
    }
}