/* ── 表单分区标题 ── */
.form-section-title {
    font-size: 0.92rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.8rem;
    padding-left: 0.6rem;
    border-left: 3px solid #2563eb;
}

/* ── 两列表单布局 ── */
.calc-form-2col {
    grid-template-columns: 1fr 1fr;
}

/* ── 提前还款方式标签 ── */
.prepay-type-tabs {
    display: flex;
    gap: 0;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1.4rem;
}

.prepay-type-tab {
    flex: 1;
    padding: 0.7rem 0;
    border: none;
    background: #fafafa;
    color: #666;
    font-size: 0.92rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    border-right: 1px solid #e0e0e0;
}

.prepay-type-tab:last-child {
    border-right: none;
}

.prepay-type-tab:hover {
    background: #f0f4ff;
    color: #2563eb;
}

.prepay-type-tab.active {
    background: #2563eb;
    color: white;
    font-weight: 600;
}

/* ── 单列结果卡片 ── */
.result-card {
    background: #f8f9fb;
    border: 1px solid #e8eaf0;
    border-radius: 8px;
    overflow: hidden;
}

.result-card-header {
    padding: 0.65rem 1rem;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: #eef2ff;
    color: #2563eb;
}

/* ── Mobile ── */
@media (max-width: 640px) {
    .calc-form-2col {
        grid-template-columns: 1fr;
    }
}