body { background-color: var(--canvas); color: var(--ink);
}

.main-content {
    padding: 20px;
}

.container {
    max-width: 820px;
    margin: 0 auto;
}

h1 {
    font-family: 'Crimson Pro', serif;
    font-size: 2.5rem;
    font-weight: 700; color: var(--info-strong);
    margin-bottom: 1rem;
    text-align: center;
}

.subtitle {
    text-align: center; color: var(--ink-60);
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
}

.calculator-card { background-color: var(--surface); border-radius: var(--r-sm);
    padding: 2.5rem; box-shadow: none;
    margin-bottom: 2rem;
}

.info-box { background-color: var(--canvas); border-left: 4px solid var(--keyline);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: var(--r-sm);
}

.info-box p { color: var(--ink-70);
    margin-bottom: 0.5rem;
}

.info-box p:last-child {
    margin-bottom: 0;
}

.info-box strong { color: var(--info-strong);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem; color: var(--ink);
    font-weight: 500;
    font-size: 0.95rem;
}

.label-hint {
    font-weight: 400; color: var(--ink-60);
    font-size: 0.85rem;
}

input, select {
    width: 100%;
    padding: 0.75rem; background-color: var(--canvas); border: 2px solid var(--rule); border-radius: var(--r-sm); color: var(--ink);
    font-size: 1rem;
    font-family: 'Work Sans', sans-serif;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}

input:focus, select:focus {
    outline: none; border-color: var(--keyline);
}

input::placeholder { color: var(--ink-60);
}

select {
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.calculate-btn {
    width: 100%;
    padding: 1rem; background-color: var(--ink);
    color: white;
    border: none; border-radius: var(--r-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-family: 'Work Sans', sans-serif;
    margin-top: 1rem;
}

.calculate-btn:hover { background-color: var(--ink-strong);
}

.results {
    display: none;
    margin-top: 2rem;
    padding-top: 2rem; border-top: 2px solid var(--rule);
}

.results.show {
    display: block;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem; background-color: var(--canvas); border-radius: var(--r-sm);
    margin-bottom: 0.75rem;
}

.result-label { color: var(--ink-60);
    font-size: 0.95rem;
}

.result-value {
    font-size: 1.3rem;
    font-weight: 600; color: var(--ink);
}

.result-row.headline { background-color: var(--surface); border: 2px solid var(--keyline);
    padding: 1.25rem;
}

.result-row.headline .result-label { color: var(--ink);
    font-size: 1.1rem;
    font-weight: 600;
}

.result-row.headline .result-value {
    font-size: 1.8rem; color: var(--info-strong);
}

.result-row.cost .result-value {
    color: var(--negative);
}

.uk-note { background-color: var(--canvas);
    border-left: 4px solid var(--caution-deep);
    padding: 1rem 1.25rem;
    border-radius: var(--r-sm);
    margin-top: 1rem;
    display: none;
}

.uk-note.show {
    display: block;
}

.uk-note p { color: var(--ink-70);
    margin: 0;
    font-size: 0.95rem;
}

.uk-note strong { color: var(--caution-deep);
}

.explainer { background-color: var(--surface); border-radius: var(--r-sm);
    padding: 2rem 2.5rem;
    margin-bottom: 2rem;
}

.explainer h2 {
    font-family: 'Crimson Pro', serif; color: var(--info-strong);
    font-size: 1.6rem;
    margin-top: 0;
    margin-bottom: 1rem;
}

.explainer h3 {
    font-family: 'Crimson Pro', serif; color: var(--ink);
    font-size: 1.2rem;
    margin-top: 1.75rem;
    margin-bottom: 0.5rem;
}

.explainer p { color: var(--ink-70);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.explainer a { color: var(--info-strong);
}

.responsible {
    text-align: center; color: var(--ink-60);
    font-size: 0.9rem;
    margin: 2rem auto 1rem;
    max-width: 600px;
    line-height: 1.6;
}

@media (max-width: 640px) {
    h1 { font-size: 2rem; }
    .calculator-card { padding: 1.5rem; }
    .explainer { padding: 1.5rem; }
    .result-value { font-size: 1.1rem; }
    .result-row.headline .result-value { font-size: 1.5rem; }
}