* {
    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;
}

.hero {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.card-system {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
}

.card-system h1 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    text-align: center;
    margin-bottom: 10px;
}

.card-system p {
    color: #666;
    text-align: center;
    font-size: 14px;
}

.form-control {
    border: 1px solid #ddd;
    padding: 12px;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.btn-primary {
    background: #667eea;
    border: none;
    padding: 12px;
    font-weight: 600;
    border-radius: 5px;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #764ba2;
}

.alert {
    border-radius: 5px;
    font-size: 14px;
}

.text-center a {
    color: #667eea;
    text-decoration: none;
}

.text-center a:hover {
    text-decoration: underline;
}