/* ── Tabs ── */
.lilv-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 1.5rem;
}

.lilv-tab {
    padding: 0.7rem 1.8rem;
    border: none;
    background: none;
    font-size: 0.95rem;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    position: relative;
    font-family: inherit;
    transition: color 0.2s;
}

.lilv-tab:hover {
    color: #2563eb;
}

.lilv-tab.active {
    color: #2563eb;
    font-weight: 600;
}

.lilv-tab.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: #2563eb;
}

/* ── Tab Panels ── */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* ── 利率转换表单 ── */
.convert-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    margin-bottom: 1.4rem;
}

/* ── 利率反算表单 ── */
.reverse-form {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.2rem;
    margin-bottom: 1.4rem;
}

/* ── 结果卡片 ── */
.result-card {
    margin-top: 1.4rem;
    background: #f8f9fb;
    border: 1px solid #e8eaf0;
    border-radius: 8px;
    overflow: hidden;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.7rem 1.2rem;
    border-bottom: 1px solid #f0f0f0;
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    font-size: 0.9rem;
    color: #666;
}

.result-value {
    font-size: 0.95rem;
    color: #333;
    font-family: 'Fira Code', monospace;
    font-weight: 600;
}

.result-row.highlight {
    background: #eef2ff;
}

.result-row.highlight .result-label {
    color: #2563eb;
    font-weight: 500;
}

.result-row.highlight .result-value {
    color: #2563eb;
    font-size: 1.05rem;
    font-weight: 700;
}

.result-row.sub .result-label {
    color: #999;
    font-size: 0.85rem;
}

.result-row.sub .result-value {
    color: #999;
    font-size: 0.85rem;
}

/* ── 利率知识卡片 ── */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.knowledge-card {
    background: white;
    border: 1px solid #e8eaf0;
    border-radius: 10px;
    padding: 1.5rem 1.3rem;
    transition: box-shadow 0.2s;
}

.knowledge-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.knowledge-title {
    font-size: 1rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 0.6rem;
}

.knowledge-desc {
    font-size: 0.88rem;
    color: #555;
    line-height: 1.7;
    margin-bottom: 0.8rem;
}

.knowledge-formula {
    font-size: 0.82rem;
    color: #2563eb;
    background: #f0f4ff;
    border-radius: 6px;
    padding: 0.6rem 0.8rem;
    line-height: 1.8;
    font-family: 'Fira Code', monospace;
}

/* ── Mobile ── */
@media (max-width: 900px) {
    .reverse-form {
        grid-template-columns: 1fr 1fr;
    }
    .knowledge-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .convert-form {
        grid-template-columns: 1fr;
    }
    .reverse-form {
        grid-template-columns: 1fr;
    }
    .lilv-tab {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}