:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6c757d;
    --light-color: #f8f9fa;
    --border-color: #dee2e6;
    --success-color: #28a745;
}

.converter-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    padding: .5rem 1rem;
    margin-bottom: 2rem;
}

/* 双列布局 - 更紧凑 */
.unit-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .5rem;
}

/* 移动端单列 */
@media (max-width: 768px) {
    .unit-grid {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
}

/* 紧凑的单位行 */
.unit-row {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.55rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s;
    background-color: white;
}

.unit-row:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 6px rgba(74, 111, 165, 0.1);
}

/* 单位标签区域 */
.unit-label-container {
    flex: 0 0 160px;
    min-width: 0;
}

.unit-label {
    font-weight: 500;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.unit-label i {
    flex-shrink: 0;
    width: 18px;
    text-align: center;
}

.unit-group {
    font-size: 0.7rem;
    color: var(--secondary-color);
    background-color: var(--light-color);
    padding: 0.05rem 0.3rem;
    border-radius: 2px;
    margin-left: 4px;
    white-space: nowrap;
}

/* 输入框组 - 更紧凑 */
.input-group-compact {
    flex: 1;
    display: flex;
    gap: 0.5rem;
    min-width: 0;
}

.unit-input {
    flex: 1;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.6rem;
    font-size: 0.85rem;
    min-height: 36px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.unit-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 111, 165, 0.25);
    outline: none;
}

.convert-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 55px;
    white-space: nowrap;
    height: 36px;
    flex-shrink: 0;
}

.convert-btn:hover {
    background-color: #3a5a85;
}

/* 重置按钮 */
.reset-btn {
    background: linear-gradient(to right, #ff7e5f, #feb47b);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.6rem 1.2rem;
    font-weight: 500;
    transition: transform 0.2s, box-shadow 0.2s;
    font-size: 0.9rem;
    /*margin-top: 1rem;*/
}

.reset-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* 说明区域 */
.instructions {
    background-color: var(--light-color);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    border-radius: 0 6px 6px 0;
    margin-top: 1.5rem;
}

.instructions h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.instructions ul {
    margin-bottom: 0.5rem;
    padding-left: 1.2rem;
}

.instructions li {
    margin-bottom: 0.25rem;
    font-size: 0.85rem;
}

.ratio-table {
    font-size: 0.8rem;
    margin-top: 0.75rem;
}

.ratio-table th, .ratio-table td {
    padding: 0.2rem 0.4rem;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .unit-label-container {
        flex: 0 0 140px;
    }
}

@media (max-width: 768px) {
    .converter-container {
        padding: 1.2rem;
    }

    .unit-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.4rem;
        padding: 0.5rem;
    }

    .unit-label-container {
        flex: none;
        width: 100%;
    }

    .input-group-compact {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .unit-input {
        font-size: 0.85rem;
        padding: 0.4rem 0.5rem;
    }

    .convert-btn {
        padding: 0.4rem 0.6rem;
        min-width: 50px;
        font-size: 0.75rem;
    }
}

/* 分割线 */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.2rem 0;
    color: var(--secondary-color);
    font-size: 0.85rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider::before {
    margin-right: .5em;
}

.divider::after {
    margin-left: .5em;
}