/* 计算器样式文件 */

.calculator-container {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    margin: 0 auto 2rem;
    overflow: hidden;
}

.calculator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.mode-switch {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.mode-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.calculator-actions {
    display: flex;
    gap: 0.5rem;
}

.display-container {
    position: relative;
    padding: 1.5rem;
    background: var(--secondary-bg);
    text-align: right;
}

.previous-display {
    min-height: 2rem;
    font-size: 1.25rem;
    color: var(--text-secondary);
    word-break: break-all;
    opacity: 0.8;
}

.current-display {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    word-break: break-all;
    padding: 0.5rem 0;
    min-height: 3rem;
}

.memory-indicator {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    font-size: 0.85rem;
    color: var(--primary-color);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.memory-indicator.active {
    opacity: 1;
}

.calculator-buttons {
    display: grid;
    gap: 1px;
    background: var(--border-color);
}

.basic-buttons {
    grid-template-columns: repeat(4, 1fr);
}

.scientific-buttons {
    grid-template-columns: repeat(6, 1fr);
    display: none;
}

.calculator-buttons.active {
    display: grid;
}

.button-row {
    display: contents;
}

.calc-btn {
    padding: 1.25rem 1rem;
    border: none;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
    position: relative;
    overflow: hidden;
}

.calc-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.calc-btn:active::before {
    width: 200%;
    height: 200%;
}

.calc-btn:hover {
    background: var(--hover-bg);
}

.number-btn {
    background: var(--card-bg);
}

.number-btn[data-number="0"] {
    grid-column: span 2;
}

.operator-btn {
    background: var(--primary-color-light);
    color: var(--primary-color);
    font-weight: 700;
}

.equals-btn {
    background: var(--primary-color);
    color: white;
    font-weight: 700;
    grid-column: span 2;
}

.function-btn {
    background: var(--secondary-bg);
    color: var(--text-secondary);
    font-size: 1rem;
}

.history-panel {
    position: fixed;
    top: 0;
    right: -350px;
    width: 350px;
    height: 100%;
    background: var(--card-bg);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    transition: right 0.3s ease;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.history-panel.active {
    right: 0;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.history-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.clear-history-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.clear-history-btn:hover {
    background: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.history-item {
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--secondary-bg);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.history-expression {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    word-break: break-all;
}

.history-result {
    color: var(--primary-color);
    font-weight: 700;
    word-break: break-all;
}

.empty-message {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
    margin: 0;
    font-style: italic;
}

.calculator-info {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.calculator-info h3 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.3rem;
    text-align: center;
}

.info-content {
    color: var(--text-secondary);
    line-height: 1.6;
}

.info-content h4 {
    color: var(--text-primary);
    margin-top: 1.2rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.info-content ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.info-content li {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .calculator-container {
        border-radius: 0;
        margin-bottom: 0;
    }
    
    .current-display {
        font-size: 2rem;
    }
    
    .calc-btn {
        padding: 1rem 0.5rem;
        min-height: 50px;
        font-size: 1.1rem;
    }
    
    .history-panel {
        width: 100%;
        right: -100%;
    }
    
    .calculator-info {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .calculator-header {
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }
    
    .mode-switch {
        justify-content: center;
    }
    
    .calculator-actions {
        justify-content: center;
    }
    
    .display-container {
        padding: 1rem;
    }
    
    .current-display {
        font-size: 1.75rem;
    }
    
    .scientific-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .calc-btn {
        font-size: 1rem;
        min-height: 45px;
    }
    
    .function-btn {
        font-size: 0.9rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.history-item {
    animation: fadeIn 0.3s ease;
}

/* 主题切换效果 */
[data-theme="dark"] .calculator-container {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .history-panel {
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
}

/* 按钮特定样式 */
.calc-btn[data-action="clear"] {
    color: var(--error-color);
}

.calc-btn[data-action="delete"] {
    color: var(--warning-color);
}

.calc-btn[data-number="e"],
.calc-btn[data-function="pi"] {
    color: var(--primary-color);
    font-style: italic;
}

/* 滚动条样式 */
.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* 加载状态 */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 1rem;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

/* 按钮焦点样式 */
.calc-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.equals-btn:focus {
    outline: 2px solid white;
}

/* 按钮禁用状态 */
.calc-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.calc-btn:disabled:hover {
    background: var(--input-bg);
}

.number-btn:disabled:hover {
    background: var(--card-bg);
}

.operator-btn:disabled:hover {
    background: var(--primary-color-light);
}

.equals-btn:disabled:hover {
    background: var(--primary-color);
}

.function-btn:disabled:hover {
    background: var(--secondary-bg);
}