/* ==========================================
   单位换算器专用样式
   依赖: tools-common.css
   ========================================== */

/* CSS变量定义 */
:root {
    --text-color: #333;
    --primary-color: #4285f4;
    --secondary-color: #f5f5f5;
    --border-color: #ddd;
    --bg-color: #fff;
    --card-bg: #fff;
    --text-muted: #999;
}

/* ========== 选项卡样式 ========== */
.tab-container {
    margin-bottom: 20px;
}

.tab-buttons {
    display: flex;
    border-bottom: 2px solid #e9ecef;
    gap: 0;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    position: relative;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    color: #4285f4;
    background-color: rgba(66, 133, 244, 0.05);
}

.tab-btn.active {
    color: #4285f4;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #4285f4;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 换算类型选择 */
.conversion-type-section {
    margin-bottom: 2rem;
}

.conversion-type-section .form-label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.conversion-type-section .form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.conversion-type-section .form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* 换算器部分 */
.converter-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.converter-section .form-group {
    margin-bottom: 1rem;
}

.converter-section .form-label {
    display: block;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.converter-section .form-select,
.converter-section .form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.converter-section .form-select:focus,
.converter-section .form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.converter-section .form-input::placeholder {
    color: var(--text-muted);
}

/* 数值输入特殊样式 */
.converter-section input[type="number"] {
    text-align: right;
    font-weight: 500;
}

/* 换算按钮 */
.form-group .btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #5a67d8);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #5a67d8, var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

/* 结果区域 */
.result-section {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.result-title {
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
}

.result-content .message {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 500;
}

.result-content .message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.result-content .message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.result-content .result-content {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.result-label {
    font-weight: 500;
    color: var(--text-color);
}

.result-value {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.result-actions {
    text-align: center;
    margin-top: 1rem;
}

.result-actions .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .converter-section {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .result-section {
        padding: 1rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .result-value {
        font-size: 1rem;
    }
    
    .form-group .btn {
        width: 100%;
        margin-bottom: 0.5rem;
        margin-right: 0;
    }
}

@media (max-width: 480px) {
    .converter-section .form-select,
    .converter-section .form-input {
        padding: 0.6rem;
        font-size: 0.9rem;
    }
    
    .result-title {
        font-size: 1.1rem;
    }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
    .converter-section {
        background: #2d3748;
        border-color: #4a5568;
    }
    
    .result-section {
        background: linear-gradient(135deg, #2d3748, #4a5568);
    }
    
    .result-content .result-content {
        background: #1a202c;
    }
    
    .result-content .message.success {
        background: #22543d;
        color: #9ae6b4;
        border-color: #38a169;
    }
    
    .result-content .message.error {
        background: #742a2a;
        color: #feb2b2;
        border-color: #e53e3e;
    }
}

/* 加载状态 */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========== 补充缺失的样式 ========== */

/* 章节标题样式 */
.section-title {
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
    border-left: 4px solid #4285f4;
    padding-left: 12px;
}

/* 单位信息容器 */
.unit-info {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #e9ecef;
}

/* 表单组样式增强 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 15px;
    color: #333;
}

.form-select,
.form-input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.form-input[readonly] {
    background-color: #f5f5f5;
    cursor: not-allowed;
}

/* ========== 新增样式：修复缺失的关键样式 ========== */

/* 转换表单布局 */
.conversion-form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: flex-end;
}

.conversion-input {
    flex: 1;
    min-width: 150px;
}

.conversion-select {
    flex: 1;
    min-width: 150px;
}

.conversion-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    color: #4285f4;
    padding: 0 10px;
    margin-bottom: 10px;
}

/* 按钮组 */
.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* 常用转换网格 */
.conversion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.conversion-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.conversion-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.conversion-card:nth-child(1) {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.conversion-card:nth-child(2) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.conversion-card:nth-child(3) {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.conversion-card:nth-child(4) {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.conversion-card:nth-child(5) {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.conversion-card:nth-child(6) {
    background: linear-gradient(135deg, #fccb90 0%, #d57eeb 100%);
}

.conversion-card:nth-child(7) {
    background: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
}

.conversion-card:nth-child(8) {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    color: #333;
}

.conversion-title {
    font-weight: 600;
    font-size: 1.1em;
    margin-bottom: 8px;
}

.conversion-formula {
    font-size: 0.9em;
    opacity: 0.9;
}

/* 单位信息样式 */
.unit-info-content {
    padding: 10px 0;
}

.unit-info-item {
    margin-bottom: 20px;
}

.unit-info-item h4 {
    color: #4285f4;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.unit-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 8px;
}

.unit-list li {
    background: #f5f5f5;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9em;
    border-left: 3px solid #4285f4;
}

/* 历史记录样式 */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.history-item {
    background: white;
    padding: 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #e0e0e0;
}

.history-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateX(5px);
    border-color: #4285f4;
}

.history-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    align-items: center;
}

.history-type {
    font-weight: 600;
    color: #4285f4;
    font-size: 0.95em;
}

.history-time {
    color: #999;
    font-size: 0.85em;
}

.history-content {
    color: #333;
}

.history-input {
    font-weight: 500;
    margin-bottom: 4px;
    font-size: 1em;
}

.history-details {
    font-size: 0.9em;
    color: #666;
}

.empty-history {
    text-align: center;
    color: #999;
    padding: 40px 20px;
    font-size: 1em;
}

/* FAQ样式 */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #4285f4;
}

.faq-item h4 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.faq-item p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

/* 响应式设计 - 新增样式 */
@media (max-width: 768px) {
    .conversion-grid {
        grid-template-columns: 1fr;
    }

    .conversion-form {
        flex-direction: column;
    }

    .conversion-arrow {
        transform: rotate(90deg);
        margin: 5px 0;
    }

    .conversion-input,
    .conversion-select {
        width: 100%;
        min-width: 100%;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group .btn {
        width: 100%;
    }

    .unit-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .conversion-card {
        padding: 12px;
    }

    .conversion-title {
        font-size: 1em;
    }

    .conversion-formula {
        font-size: 0.85em;
    }
}