body {
    background: #f8f9fb;
    font-family: 'Arial Black', sans-serif;
    color: #111;
    padding: 40px;
}

.center {
    text-align: center;
    margin-top: 120px;
}

.logo {
    font-size: 48px;
    font-weight: 900;
    color: #ff4d4d;
}

.subtitle {
    margin: 15px 0 40px;
    color: #555;
}

.buttons .btn {
    margin: 10px;
}

.btn {
    padding: 14px 36px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
}

.primary {
    background: linear-gradient(45deg, #ff4d4d, #ff7a18);
    color: white;
}

.secondary {
    border: 2px solid #ff4d4d;
    color: #ff4d4d;
}

.page-title {
    font-size: 32px;
    margin-bottom: 30px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    max-width: 400px;
}

input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
}

.result {
    margin-top: 30px;
    padding: 20px;
    border-radius: 12px;
}

.green {
    background: #e6fff1;
    border-left: 6px solid #00c853;
}

.red {
    background: #ffecec;
    border-left: 6px solid #ff1744;
}

.back {
    text-decoration: none;
    font-weight: bold;
    color: #ff4d4d;
}