body {
    background: linear-gradient(180deg, #f8f9fa 0%, #eef2f7 100%);
    min-height: 100vh;
}

.app-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 2rem 0;
}

.calculator-card {
    border: 0;
    border-radius: 1.5rem;
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.card-header-custom {
    background: #111827;
    color: #fff;
    padding: 1.5rem;
}

.card-header-custom h1 {
    font-size: 1.5rem;
    margin-bottom: 0.35rem;
}

.card-header-custom p {
    margin: 0;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.95rem;
}

.form-section {
    padding: 1.5rem;
}

.form-label {
    font-weight: 600;
    color: #374151;
}

.form-control,
.btn {
    border-radius: 0.9rem;
}

.form-control {
    min-height: 3rem;
}

.btn-calculate {
    min-height: 3.25rem;
    font-weight: 600;
}

.btn-now {
    min-width: 72px;
    font-weight: 600;
}

.input-group > .form-control {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group > .btn {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.result-box {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 1rem;
    padding: 1.25rem;
}

.result-block + .result-block {
    margin-top: 1rem;
}

.result-label {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 0.25rem;
}

.result-value {
    font-size: 1rem;
    font-weight: 600;
    color: #111827;
}

.result-value-large {
    font-size: 1.4rem;
    font-weight: 700;
    color: #111827;
    line-height: 1.2;
}

.amp-placeholder {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    color: #111827;
}

.amp-subtext {
    color: #6b7280;
    margin-top: 0.35rem;
}

.result-separator {
    height: 1px;
    background: #e5e7eb;
    margin: 1rem 0;
}

@media (max-width: 576px) {
    .app-shell {
        align-items: stretch;
        padding: 1rem 0;
    }

    .card-header-custom,
    .form-section {
        padding: 1.25rem;
    }

    .card-header-custom h1 {
        font-size: 1.3rem;
    }

    .btn-now {
        min-width: 64px;
    }
}