/* 基础样式和重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

:root {
    --primary-color: #007aff;
    --secondary-color: #5ac8fa;
    --success-color: #34c759;
    --warning-color: #ff9500;
    --danger-color: #ff3b30;
    --gray-1: #f2f2f7;
    --gray-2: #e5e5ea;
    --gray-3: #d1d1d6;
    --gray-4: #c7c7cc;
    --gray-5: #aeaeb2;
    --text-primary: #000000;
    --text-secondary: #3c3c43;
    --text-tertiary: #6c6c70;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    --border-radius: 12px;
    --protein-color: #007aff;
    --carbs-color: #5ac8fa;
    --fat-color: #ff9500;
}

body {
    background-color: #f2f2f7;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-tertiary);
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 16px;
}

.header-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

.control-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.control-btn:hover {
    background-color: #0062cc;
}

/* 当前日期显示 */
.current-date-display {
    text-align: center;
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: white;
    border-radius: var(--border-radius);
    padding: 12px;
    box-shadow: var(--card-shadow);
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
    animation: modal-appear 0.3s;
}

@keyframes modal-appear {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--gray-2);
}

.modal-header h2 {
    margin-bottom: 0;
    font-size: 20px;
}

.close-modal {
    color: var(--text-tertiary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
}

.close-modal:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

/* 卡片样式 */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 24px;
    margin-bottom: 24px;
}

h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

h3 {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* 日期选择样式 */
.date-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
}

.date-controls button {
    background-color: var(--gray-1);
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background-color 0.2s;
}

.date-controls button:hover {
    background-color: var(--gray-2);
}

.date-controls #today-btn {
    background-color: var(--primary-color);
    color: white;
}

.date-controls #today-btn:hover {
    background-color: #0062cc;
}

.date-controls input[type="date"] {
    padding: 8px 12px;
    border: 1px solid var(--gray-3);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* 营养目标设置样式 */
.goals-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 20px;
}

.form-group label {
    flex: 1;
    font-size: 16px;
    color: var(--text-secondary);
}

.form-group input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--gray-3);
    border-radius: 8px;
    font-size: 16px;
    color: var(--text-primary);
}

.form-action {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 20px 0;
}

.form-action button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 20px;
    padding: 10px 24px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.form-action button:hover {
    background-color: #0062cc;
}

.form-action .secondary-btn {
    background-color: var(--gray-2);
    color: var(--text-secondary);
}

.form-action .secondary-btn:hover {
    background-color: var(--gray-3);
}

.calorie-summary {
    margin-top: 20px;
    text-align: center;
    padding: 16px;
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.calorie-summary p {
    font-size: 16px;
    color: var(--text-secondary);
}

#total-calories-goal {
    font-weight: 600;
    color: var(--primary-color);
    margin-left: 4px;
}

.calorie-formula {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-top: 8px;
}

/* 营养摄入概览样式 */
.nutrition-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.calories-circle {
    position: relative;
    width: 200px;
    height: 200px;
}

.calories-info {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.calories-consumed {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.calories-total {
    font-size: 16px;
    color: var(--text-tertiary);
    display: block;
}

.calories-unit {
    font-size: 14px;
    color: var(--text-tertiary);
    display: block;
    margin-top: 4px;
}

.nutrition-bars {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 20px;
}

.nutrition-item {
    width: 100%;
}

.nutrition-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 16px;
}

.nutrition-value {
    color: var(--text-tertiary);
    font-size: 14px;
}

.progress-container {
    width: 100%;
    height: 8px;
    background-color: var(--gray-2);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: 4px;
}

.progress-bar.protein {
    background-color: var(--protein-color);
}

.progress-bar.carbs {
    background-color: var(--carbs-color);
}

.progress-bar.fat {
    background-color: var(--fat-color);
}

/* 营养分布图表样式 */
.chart-container {
    height: 300px;
    margin-bottom: 20px;
}

.nutrition-tips {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* 今日餐食记录样式 */
.meal-tabs {
    display: flex;
    overflow-x: auto;
    margin-bottom: 20px;
    gap: 8px;
}

.meal-tab-btn {
    padding: 10px 16px;
    background: none;
    border: none;
    border-radius: 20px;
    font-size: 16px;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
}

.meal-tab-btn.active {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

.meal-tab-content {
    display: none;
}

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

.meal-form {
    margin-bottom: 20px;
    padding: 16px;
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.form-row input {
    flex: 1;
    min-width: 100px;
    padding: 10px 12px;
    border: 1px solid var(--gray-3);
    border-radius: 8px;
    font-size: 14px;
}

.form-row input[type="text"] {
    flex: 2;
    min-width: 150px;
}

.form-row button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 14px;
    cursor: pointer;
}

.meal-list {
    margin-bottom: 20px;
}

.empty-meal {
    text-align: center;
    padding: 20px;
    color: var(--text-tertiary);
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.food-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-2);
    background-color: white;
}

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

.food-item:hover {
    background-color: var(--gray-1);
}

.food-name {
    font-weight: 500;
}

.food-macros {
    display: flex;
    gap: 16px;
    color: var(--text-tertiary);
    font-size: 14px;
}

.food-actions {
    display: flex;
    gap: 8px;
}

.delete-food {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 14px;
}

.meal-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px;
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.summary-item {
    flex: 1;
    min-width: 120px;
    text-align: center;
    padding: 8px;
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    color: var(--text-secondary);
    font-size: 14px;
}

.summary-item span {
    font-weight: 600;
    color: var(--primary-color);
    margin-left: 4px;
}

/* 体重记录样式 */
.weight-form {
    max-width: 600px;
    margin: 0 auto 20px;
    padding: 16px;
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.weight-history {
    margin-top: 30px;
}

.weight-history h3 {
    text-align: center;
    margin-bottom: 16px;
}

.chart-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.chart-period-btn {
    padding: 8px 16px;
    background-color: var(--gray-2);
    border: none;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.chart-period-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.weight-tips {
    text-align: center;
    margin-top: 16px;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* 体重历史记录列表 */
.weight-records-list {
    max-height: 400px;
    overflow-y: auto;
}

.weight-record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-2);
}

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

.weight-record-date {
    font-weight: 500;
}

.weight-record-value {
    color: var(--primary-color);
    font-weight: 600;
}

.weight-record-actions {
    display: flex;
    gap: 8px;
}

.delete-weight-record {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 14px;
}

/* 营养小贴士样式 */
.tips-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.tip {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background-color: var(--gray-1);
    border-radius: var(--border-radius);
}

.tip-icon {
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: white;
    border-radius: 50%;
    box-shadow: var(--card-shadow);
}

.tip-content h3 {
    margin-bottom: 8px;
    font-size: 16px;
}

.tip-content p {
    color: var(--text-tertiary);
    font-size: 14px;
    line-height: 1.5;
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    .nutrition-stats {
        flex-direction: column;
        align-items: center;
    }
    
    .calories-circle {
        width: 180px;
        height: 180px;
    }
    
    .meal-tabs {
        padding-bottom: 8px;
    }
    
    .tips-container {
        grid-template-columns: 1fr;
    }

    .form-group {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

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

    .meal-summary {
        flex-direction: column;
        gap: 8px;
    }
    
    .date-controls {
        flex-wrap: wrap;
    }
    
    .chart-controls {
        flex-wrap: wrap;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 16px;
    }
    
    h2 {
        font-size: 20px;
    }
    
    .form-row input, .form-row button {
        font-size: 14px;
    }
    
    .header-controls {
        flex-direction: column;
        gap: 8px;
    }
}