body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.auth-container {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
    border-top: 5px solid #1abc9c;
}

.auth-logo {
    width: 80px;
    margin-bottom: 15px;
    filter: drop-shadow(0px 2px 4px rgba(0,0,0,0.2));
}

.auth-title {
    color: #2c3e50;
    margin-bottom: 5px;
    font-size: 24px;
}

.auth-subtitle {
    color: #7f8c8d;
    font-size: 14px;
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

.form-group input:focus {
    border-color: #1abc9c;
    outline: none;
}

.btn-auth {
    background-color: #2c3e50;
    color: white;
    border: none;
    padding: 15px;
    width: 100%;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.btn-auth:hover {
    background-color: #1abc9c;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid #f5c6cb;
}