/* 單位轉換器專用樣式 */

/* 類型選擇區 */
.category-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg, white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.category-section h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 1rem;
    background: var(--light-gray);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.category-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.category-btn.active {
    background: linear-gradient(135deg, var(--primary-color), #e68a00);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(247, 147, 26, 0.3);
}

.category-icon {
    font-size: 2rem;
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
}

.category-desc {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* 轉換器區域 */
.converter-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg, white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.converter-section h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.converter-container {
    max-width: 800px;
    margin: 0 auto;
}

.converter-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: end;
    margin-bottom: 2rem;
}

.converter-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 80px;
    justify-content: flex-end;
}

.converter-input-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 1rem;
}

.input-container {
    display: flex;
    gap: 0.75rem;
    align-items: stretch;
}

.value-input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: var(--card-bg, white);
    color: var(--text-color);
    transition: all 0.3s ease;
    height: auto;
    box-sizing: border-box;
    min-height: 52px;
}

.value-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(247, 147, 26, 0.2);
    transform: translateY(-1px);
}

.value-input[readonly] {
    background: var(--light-gray);
    cursor: default;
}

.unit-select {
    padding: 1rem 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--card-bg, white);
    color: var(--text-color);
    cursor: pointer;
    min-width: 120px;
    transition: border-color 0.3s ease;
    height: auto;
    box-sizing: border-box;
}

.unit-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.converter-swap {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    min-height: 80px;
}

.swap-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-bottom: 4px;
}

.swap-btn:hover {
    background: #4f46e5;
    transform: rotate(180deg) scale(1.1);
}

.swap-icon {
    font-size: 1.5rem;
    font-weight: bold;
}

.converter-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 公式顯示區 */
.formula-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--light-gray);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.formula-section h4 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
}

.formula-content {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-color);
    line-height: 1.5;
    background: var(--card-bg, white);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* 參考表區域 */
.reference-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg, white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.reference-section h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
    font-weight: 600;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.reference-container {
    display: grid;
    gap: 1rem;
}

.reference-table {
    overflow-x: auto;
}

.reference-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.reference-table th,
.reference-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.reference-table th {
    background: var(--light-gray);
    font-weight: 600;
    color: var(--text-color);
}

.reference-table td {
    color: var(--text-color);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.reference-table tr:hover {
    background: rgba(247, 147, 26, 0.1);
}

/* 批量轉換區 */
.batch-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg, white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.batch-section h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
    font-weight: 600;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.batch-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.batch-input label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: block;
}

.batch-textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    background: var(--card-bg, white);
    color: var(--text-color);
    resize: vertical;
    transition: border-color 0.3s ease;
    margin-bottom: 1rem;
}

.batch-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.batch-settings {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.batch-setting-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.batch-setting-group label {
    font-size: 0.9rem;
    font-weight: 600;
    margin: 0;
}

.unit-select-small {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    background: var(--card-bg, white);
    color: var(--text-color);
    cursor: pointer;
    min-width: 100px;
}

.batch-controls {
    display: flex;
    gap: 1rem;
}

.batch-results h4 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
}

.batch-output {
    padding: 1rem;
    background: var(--light-gray);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
    white-space: pre-wrap;
    color: var(--text-color);
}

.batch-actions {
    display: flex;
    gap: 1rem;
}

/* 常用範例區 */
.examples-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--light-gray);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.examples-section h3 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.example-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--card-bg, white);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.example-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.example-icon {
    font-size: 1.5rem;
}

.example-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.example-desc {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* 教學區域樣式 */
.unit-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.unit-type {
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.unit-type h4 {
    margin: 0 0 0.5rem 0;
    color: var(--primary-color);
    font-size: 1rem;
}

.unit-type p {
    margin: 0;
    color: var(--text-color);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* 按鈕樣式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
    background: var(--primary-color);
    color: white;
}

.btn:hover {
    background: #e68a00;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(247, 147, 26, 0.3);
}

.btn:disabled {
    background: var(--border-color);
    color: var(--text-color);
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-copy {
    background: var(--secondary-color);
}

.btn-copy:hover {
    background: #4f46e5;
}

.btn-icon {
    font-size: 1.1rem;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .category-btn {
        padding: 1rem 0.75rem;
        gap: 0.5rem;
    }
    
    .category-icon {
        font-size: 1.5rem;
    }
    
    .category-name {
        font-size: 1rem;
    }
    
    .category-desc {
        font-size: 0.8rem;
    }
    
    .converter-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .converter-swap {
        order: 3;
        margin: 1rem 0;
    }
    
    .swap-btn {
        transform: rotate(90deg);
    }
    
    .swap-btn:hover {
        transform: rotate(270deg) scale(1.1);
    }
    
    .input-container {
        flex-direction: column;
        gap: 0.5rem;
        align-items: stretch;
    }
    
    .converter-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .batch-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .batch-settings {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .batch-controls {
        flex-direction: column;
    }
    
    .batch-actions {
        flex-direction: column;
    }
    
    .unit-types-grid {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .category-section {
        padding: 1.5rem;
    }
    
    .converter-section {
        padding: 1.5rem;
    }
    
    .reference-section {
        padding: 1.5rem;
    }
    
    .batch-section {
        padding: 1.5rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .category-btn {
        padding: 1rem;
    }
    
    .value-input {
        font-size: 1rem;
        padding: 0.75rem;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .example-btn {
        padding: 0.75rem;
        gap: 0.25rem;
    }
    
    .example-icon {
        font-size: 1.2rem;
    }
    
    .reference-table {
        font-size: 0.8rem;
    }
    
    .reference-table th,
    .reference-table td {
        padding: 0.5rem;
    }
}