.section-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--sub);
    margin: 18px 0 10px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px 16px 18px;
    margin-bottom: 14px;
}

.card-header {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 12px;
}

.calc-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-start;
}

.field {
    flex: 1 1 140px;
}

label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--sub);
    margin-bottom: 4px;
    display: block;
}

.input-shell {
    border: 1px solid var(--border);
    background: #fff;
    padding: 8px 10px;
    border-radius: 10px;
}

input[type="text"] {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 16px;
    outline: none;
    -webkit-appearance: none;
}

input.invalid {
    background-color: var(--danger-bg);
}

.between-text {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
    margin-top: 26px;
    color: var(--sub);
    font-size: 14px;
}

.result-box {
    min-width: 130px;
}

.result {
    background: var(--res-bg);
    border: 1px solid var(--border);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    text-align: right;
    cursor: pointer;
    white-space: nowrap;
}

.result.copied {
    border-color: var(--accent);
}

/* FAQ */
.faq-item + .faq-item {
    border-top: 1px solid var(--border);
}

.faq-question {
    width: 100%;
    padding: 10px 0;
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    text-align: left;
    color: var(--text);
    cursor: pointer;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .2s ease;
    font-size: 13px;
    color: var(--sub);
}
.faq-item.open {
    padding-bottom: 10px;
}

.faq-item.open .faq-answer {
    max-height: 300px;
}