/* ========================================
   食物营养成分工具 - 专用样式
   ======================================== */

/* ========== 搜索功能区域 ========== */
.search-section {
    margin-bottom: 30px;
}

.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.search-input {
    flex: 1;
    padding: 12px 20px;
    font-size: 16px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    outline: none;
    transition: border-color 0.3s;
}

.search-input:focus {
    border-color: #4CAF50;
}

.search-btn {
    padding: 12px 30px;
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    white-space: nowrap;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.search-btn i {
    margin-right: 5px;
}

.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    padding: 8px 16px;
    background: #f5f5f5;
    color: #666;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    user-select: none;
}

.tag:hover {
    background: #4CAF50;
    color: white;
    transform: translateY(-2px);
}

/* ========== 分类导航 ========== */
.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
}

.category-btn {
    padding: 10px 20px;
    background: white;
    color: #333;
    border: 2px solid #e0e0e0;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.category-btn:hover {
    border-color: #4CAF50;
    color: #4CAF50;
}

.category-btn.active {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    border-color: #4CAF50;
}

/* ========== 食物列表 ========== */
.food-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.food-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.food-card:hover {
    border-color: #4CAF50;
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.food-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.food-card-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
}

.food-card-category {
    padding: 4px 12px;
    background: #4CAF50;
    color: white;
    border-radius: 12px;
    font-size: 12px;
}

.food-card-calories {
    font-size: 24px;
    font-weight: 700;
    color: #4CAF50;
    margin: 10px 0;
}

.food-card-calories .unit {
    font-size: 14px;
    color: #666;
    font-weight: 400;
}

.food-card-nutrients {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

.nutrient-item {
    text-align: center;
}

.nutrient-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 5px;
}

.nutrient-value {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

/* 空状态 */
.food-list-empty {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.food-list-empty i {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.3;
}

.food-list-empty p {
    font-size: 18px;
}

/* ========== 营养成分详情 ========== */
.nutrition-detail {
    margin-top: 40px;
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 16px;
    border: 2px solid #e0e0e0;
}

.detail-title {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.detail-title i {
    color: #4CAF50;
}

.detail-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* 食物信息 */
.food-info h4 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.food-info p {
    font-size: 16px;
    color: #666;
    line-height: 1.6;
}

/* 营养成分卡片网格 */
.nutrition-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 950px;
}

.summary-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    border: 2px solid #e0e0e0;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
}

.summary-card:hover {
    border-color: #4CAF50;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.summary-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.summary-icon i {
    font-size: 24px;
    color: white;
}

.summary-content {
    flex: 1;
}

.summary-content h4 {
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
    font-weight: 500;
}

.summary-value {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    line-height: 1;
    margin-bottom: 5px;
}

.summary-unit {
    font-size: 12px;
    color: #999;
}

/* 维生素和矿物质 */
.vitamin-mineral {
    background: white;
    padding: 25px;
    border-radius: 12px;
    border: 2px solid #e0e0e0;
}

.vitamin-mineral h4 {
    font-size: 20px;
    font-weight: 700;
    color: #333;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.vitamin-mineral h4 i {
    color: #4CAF50;
}

.vitamin-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.vitamin-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s;
}

.vitamin-item:hover {
    background: #e8f5e9;
}

.vitamin-name {
    font-size: 14px;
    color: #666;
}

.vitamin-value {
    font-size: 16px;
    font-weight: 600;
    color: #4CAF50;
}

/* ========== 响应式设计 ========== */

/* 平板端 (768px - 1024px) */
@media (max-width: 1024px) {
    .nutrition-summary {
        grid-template-columns: repeat(2, 1fr);
    }

    .vitamin-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 手机端 (< 768px) */
@media (max-width: 768px) {
    .search-box {
        flex-direction: column;
    }

    .search-btn {
        width: 100%;
    }

    .category-nav {
        padding: 15px;
    }

    .category-btn {
        padding: 8px 16px;
        font-size: 13px;
    }

    .food-list {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .nutrition-detail {
        padding: 20px;
    }

    .detail-title {
        font-size: 20px;
    }

    .food-info h4 {
        font-size: 22px;
    }

    .nutrition-summary {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .summary-card {
        padding: 15px;
    }

    .summary-icon {
        width: 40px;
        height: 40px;
    }

    .summary-icon i {
        font-size: 20px;
    }

    .summary-value {
        font-size: 22px;
    }

    .vitamin-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
}

/* 超小屏幕 (< 480px) */
@media (max-width: 480px) {
    .search-input {
        font-size: 14px;
        padding: 10px 15px;
    }

    .search-btn {
        font-size: 14px;
        padding: 10px 20px;
    }

    .tag {
        padding: 6px 12px;
        font-size: 12px;
    }

    .nutrition-summary {
        grid-template-columns: 1fr;
    }

    .summary-card {
        flex-direction: column;
        text-align: center;
    }

    .summary-icon {
        width: 50px;
        height: 50px;
    }
}