.csu-calculator {
    max-width: 760px;
    margin: 30px auto;
    font-family: inherit;
}

.csu-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    padding: 28px;
    box-shadow: 0 6px 25px rgba(0,0,0,.06);
}

.csu-card h2 {
    margin: 0 0 10px;
    font-size: 28px;
    line-height: 1.2;
}

.csu-description {
    color: #5b6472;
    margin-bottom: 24px;
}

.csu-field {
    margin-bottom: 17px;
}

.csu-field label {
    display: block;
    font-weight: 600;
    margin-bottom: 7px;
}

.csu-field input,
.csu-field select {
    width: 100%;
    box-sizing: border-box;
    padding: 12px 13px;
    border: 1px solid #cfd5dc;
    border-radius: 8px;
    background: #fff;
    font-size: 16px;
}

.csu-button {
    border: 0;
    border-radius: 8px;
    padding: 12px 22px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    background: #111827;
    color: #fff;
}

.csu-result {
    margin-top: 22px;
}

.csu-result-box {
    padding: 18px;
    border-radius: 10px;
    background: #f3f4f6;
}

.csu-result-value {
    font-size: 30px;
    font-weight: 800;
}

.csu-error {
    padding: 12px;
    border-radius: 8px;
    background: #fee2e2;
    color: #991b1b;
}

.csu-loading {
    color: #6b7280;
}

@media (max-width: 600px) {
    .csu-card {
        padding: 20px;
    }

    .csu-card h2 {
        font-size: 24px;
    }
}