/* CSS变量定义 */
:root {
    --primary-color: #007AFF;
    --secondary-color: #FF9500;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --danger-color: #FF3B30;
    --text-primary: #1C1C1E;
    --text-secondary: #8E8E93;
    --background-primary: #F2F2F7;
    --background-secondary: #FFFFFF;
    --border-color: #E5E5EA;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 16px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    height: 100%;
    margin: 0;
    padding: 0;
}

/* 启动动画页面 */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, #FF9500 0%, #FF6B00 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: splashFadeOut 3s ease-in-out forwards;
}

.splash-content {
    text-align: center;
    color: white;
    animation: splashContentAnimation 2s ease-out;
}

.app-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    backdrop-filter: blur(10px);
    animation: iconPulse 2s ease-in-out infinite;
}

.app-icon i {
    font-size: 40px;
    color: white;
}

.splash-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 40px;
    opacity: 0;
    animation: titleSlideUp 1s ease-out 0.5s forwards;
}

.breathing-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 auto;
    animation: breathe 2s ease-in-out infinite;
}

/* 启动动画关键帧 */
@keyframes splashFadeOut {
    0%, 70% { opacity: 1; }
    100% { 
        opacity: 0; 
        visibility: hidden;
        transform: scale(1.1);
    }
}

@keyframes splashContentAnimation {
    0% { 
        opacity: 0; 
        transform: translateY(30px);
    }
    100% { 
        opacity: 1; 
        transform: translateY(0);
    }
}

@keyframes iconPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes titleSlideUp {
    0% { 
        opacity: 0; 
        transform: translateY(20px);
    }
    100% { 
        opacity: 1; 
        transform: translateY(0);
    }
}

@keyframes breathe {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.2); opacity: 0.4; }
}

/* 主应用容器 */
.app-container {
    min-height: calc(100vh - 80px); /* 减去底部导航的高度 */
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    position: relative;
    animation: mainAppFadeIn 1s ease-out 2.5s both;
}

@keyframes mainAppFadeIn {
    0% { 
        opacity: 0; 
        transform: translateY(20px);
    }
    100% { 
        opacity: 1; 
        transform: translateY(0);
    }
}

/* 页面布局 */
.page {
    display: none;
    padding: var(--spacing-lg);
    padding-bottom: var(--spacing-lg); /* 移除额外的底部间距 */
    min-height: calc(100vh - 160px); /* 确保页面有足够高度 */
    box-sizing: border-box;
    animation: pageSlideIn 0.3s ease-out;
}

.page.active {
    display: block;
}

@keyframes pageSlideIn {
    0% { 
        opacity: 0; 
        transform: translateX(20px);
    }
    100% { 
        opacity: 1; 
        transform: translateX(0);
    }
}

/* 页面头部 */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.greeting {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.greeting i {
    font-size: 20px;
    color: var(--text-secondary);
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 卡片列表 */
.card-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* 活动卡片 */
.activity-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.activity-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.activity-card:active {
    transform: translateY(0);
}

.card-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.primary-card .card-icon {
    background: linear-gradient(135deg, #007AFF, #0051D5);
}

.secondary-card .card-icon {
    background: linear-gradient(135deg, #34C759, #248A3D);
}

.result-card .card-icon {
    background: linear-gradient(135deg, #FF9500, #CC7700);
}

.card-info {
    flex: 1;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.card-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-duration {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--background-primary);
    padding: 4px 8px;
    border-radius: 8px;
}

.card-visual {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.camera-visual {
    background: linear-gradient(135deg, #007AFF, #0051D5);
}

.upload-visual {
    background: linear-gradient(135deg, #34C759, #248A3D);
}

.result-visual {
    background: linear-gradient(135deg, #FF9500, #CC7700);
}

/* 图片预览区域 */
.image-preview-section {
    margin-bottom: var(--spacing-xl);
}

.image-preview-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.image-container {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--background-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.analysis-actions {
    display: flex;
    justify-content: center;
}

/* 营养信息展示 */
.nutrition-section {
    margin-bottom: var(--spacing-xl);
}

.nutrition-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.nutrition-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.nutrition-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.nutrition-confidence {
    font-size: 12px;
    color: var(--success-color);
    background: rgba(52, 199, 89, 0.1);
    padding: 4px 8px;
    border-radius: 8px;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.nutrition-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--background-primary);
    border-radius: 12px;
}

.nutrition-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.nutrition-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 重量输入 */
.weight-input-section {
    margin-bottom: var(--spacing-lg);
}

.weight-input-section label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.weight-input-group {
    display: flex;
    align-items: center;
    background: var(--background-primary);
    border-radius: 12px;
    padding: var(--spacing-sm);
}

.weight-input-group input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 16px;
    padding: var(--spacing-sm);
    color: var(--text-primary);
}

.weight-input-group input:focus {
    outline: none;
}

.unit {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 0 var(--spacing-sm);
}

/* 营养操作按钮 */
.nutrition-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* 加载状态 */
.loading-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 300px;
    margin: var(--spacing-lg);
}

.loading-animation {
    margin-bottom: var(--spacing-lg);
}

.loading-circle {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 1s linear infinite;
}

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

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin-top: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}

/* 我的页面样式 */
.stats-overview {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.stat-icon {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-target {
    font-size: 10px;
    color: var(--text-secondary);
}

/* 饮食记录 */
.food-log-section {
    margin-bottom: var(--spacing-xl);
}

.food-list {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--border-color);
}

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

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

.food-info h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.food-info p {
    font-size: 12px;
    color: var(--text-secondary);
}

.food-calories {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

/* 用户信息展示 */
.user-info-section {
    margin-bottom: var(--spacing-xl);
}

.user-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.user-info-item {
    background: var(--background-secondary);
    border-radius: 12px;
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--border-color);
}

.user-info-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.user-info-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 设置页面 */
.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
}

.back-button {
    background: none;
    border: none;
    font-size: 16px;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.settings-badge {
    background: rgba(255, 149, 0, 0.1);
    color: var(--secondary-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.settings-content {
    padding: 0 var(--spacing-lg);
}

.settings-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.settings-visual {
    background: linear-gradient(135deg, #FF9500, #FF6B00);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.settings-visual::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(-50px) translateY(-50px); }
}

.settings-illustration {
    position: relative;
    z-index: 1;
}

.person-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    backdrop-filter: blur(10px);
}

.person-icon i {
    font-size: 40px;
    color: white;
}

/* 表单区域 */
.form-section {
    padding: var(--spacing-xl);
}

.form-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.form-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

.form-groups {
    margin-bottom: var(--spacing-xl);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-field {
    flex: 1;
    position: relative;
}

.form-field-full {
    width: 100%;
    margin-bottom: var(--spacing-lg);
}

.form-field label,
.form-field-full label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-field input,
.form-field select,
.form-field-full select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 16px;
    background: var(--background-primary);
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

.form-field input:focus,
.form-field select:focus,
.form-field-full select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-field .unit {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 14px;
    pointer-events: none;
    margin-top: 16px;
}

/* 计算结果 */
.calculation-results {
    background: var(--background-primary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-grid {
    display: grid;
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.result-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
}

.result-unit {
    font-size: 12px;
    color: var(--text-secondary);
}

.result-status {
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 8px;
    font-weight: 600;
}

.result-status.normal {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success-color);
}

.result-status.underweight,
.result-status.overweight {
    background: rgba(255, 149, 0, 0.1);
    color: var(--warning-color);
}

.result-status.obese {
    background: rgba(255, 59, 48, 0.1);
    color: var(--danger-color);
}

/* 表单操作按钮 */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* 按钮样式 */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 48px;
    flex: 1;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: #0056CC;
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #6D6D80;
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #28A745;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* 底部导航 - 最强固定定位 */
.bottom-nav {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100vw !important;
    height: 80px !important;
    background: rgba(255, 255, 255, 0.95) !important;
    border-top: 1px solid var(--border-color);
    display: flex !important;
    align-items: center !important;
    justify-content: space-around !important;
    padding: 0 !important;
    margin: 0 !important;
    z-index: 999999 !important;
    backdrop-filter: blur(20px);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    -webkit-backdrop-filter: blur(20px);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 12px;
    margin: 0 8px;
    font-weight: 500;
    height: 100%;
    position: relative;
}

.nav-item i {
    font-size: 20px;
    margin-bottom: var(--spacing-xs);
    transition: all 0.3s ease;
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: scale(1.1);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}

.camera-modal {
    max-width: 400px;
}

.camera-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.close-btn {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
}

.camera-container {
    margin-bottom: var(--spacing-lg);
    border-radius: 12px;
    overflow: hidden;
}

.camera-container video,
.camera-container canvas {
    width: 100%;
    height: auto;
    display: block;
}

.camera-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.capture-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 4px solid white;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.capture-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
}

/* 错误提示 */
.error-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.error-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 300px;
    margin: var(--spacing-lg);
}

.error-card i {
    font-size: 48px;
    color: var(--danger-color);
    margin-bottom: var(--spacing-md);
}

.error-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.error-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* 响应式设计 */
@media (max-width: 480px) {
    .page {
        padding: var(--spacing-md);
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .nutrition-grid {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .nutrition-actions {
        flex-direction: column;
    }
    
    .page-title {
        font-size: 24px;
    }
}

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.hidden { display: none; }
.visible { display: block; }

/* 多种食物显示样式 */
.multiple-foods-container {
    width: 100%;
}

.multiple-foods-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    letter-spacing: 0.5px;
}

.food-card {
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.food-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-sm);
    text-align: center;
}

.food-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    text-align: center;
    letter-spacing: 0.5px;
}

.food-weight-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 14px;
    color: var(--text-secondary);
}

.food-weight-input input {
    width: 80px;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
}

.food-weight-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.1);
}

.food-actions {
    margin-top: var(--spacing-md);
    display: flex;
    justify-content: center;
}

.save-single-food-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s ease;
}

.save-single-food-btn:hover {
    background: #0056CC;
    transform: translateY(-1px);
}

.save-single-food-btn:active {
    transform: translateY(0);
}

.save-all-container {
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.save-all-foods-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-light);
}

.save-all-foods-btn:hover {
    background: #28A745;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.save-all-foods-btn:active {
    transform: translateY(0);
}

.save-all-container .reset-btn {
    background: var(--text-secondary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-light);
}

.save-all-container .reset-btn:hover {
    background: #6C757D;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.save-all-container .reset-btn:active {
    transform: translateY(0);
}

/* 删除按钮样式 */
.remove-food-btn {
    background: linear-gradient(135deg, #FF6B6B, #FF5252);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
    font-size: 12px;
}

.remove-food-btn:hover {
    background: linear-gradient(135deg, #FF5252, #F44336);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

.remove-food-btn:active {
    transform: scale(0.95);
}

.remove-food-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.3);
}

/* 历史记录相关样式 */
.food-log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.history-modal {
    max-width: 500px;
    max-height: 80vh;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.date-selector {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    align-items: center;
}

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

.history-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--background-primary);
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
}

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

.summary-label {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
}

.summary-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-top: 4px;
}

.history-food-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--background-secondary);
    border-radius: 12px;
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border-color);
}

.history-food-item .food-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 4px 0;
}

.history-food-item .food-info p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.food-time {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
    margin-top: 4px;
}

.history-food-item .food-calories {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

/* 确保底部导航始终可见 */
html, body {
    overflow-x: hidden;
    position: relative;
}

/* 强制重置底部导航相关的所有可能冲突样式 */
nav.bottom-nav,
.bottom-nav,
[class*="bottom-nav"] {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 99999 !important;
    transform: none !important;
    translate: none !important;
}

/* 防止任何容器影响底部导航定位 */
.app-container,
.page,
.page.active {
    position: relative !important;
    z-index: 1 !important;
}

/* 移动端浏览器特殊处理 */
@media screen and (max-width: 768px) {
    .bottom-nav {
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        width: 100% !important;
        -webkit-transform: translateZ(0) !important;
        transform: translateZ(0) !important;
    }
}

/* 针对iOS Safari的特殊处理 */
@supports (-webkit-touch-callout: none) {
    .bottom-nav {
        position: fixed !important;
        bottom: 0 !important;
        padding-bottom: env(safe-area-inset-bottom, 0px);
        -webkit-transform: translate3d(0, 0, 0) !important;
        transform: translate3d(0, 0, 0) !important;
    }
}

/* 防止WebKit浏览器的滚动问题 */
@supports (-webkit-appearance: none) {
    .bottom-nav {
        position: fixed !important;
        bottom: 0 !important;
        -webkit-backface-visibility: hidden !important;
        backface-visibility: hidden !important;
    }
}

/* 确保页面内容不被底部导航遮挡 */
.settings-button-section {
    margin-bottom: 20px; /* 确保编辑按钮不被底部导航遮挡 */
}

/* 我的页面特殊处理 */
#myPage {
    padding-bottom: 100px !important; /* 为我的页面增加额外的底部间距 */
}

/* 多种食物响应式设计 */
@media (max-width: 768px) {
    .multiple-foods-title {
        font-size: 20px;
    }
    
    .food-name {
        font-size: 18px;
    }
    
    .food-weight-input {
        justify-content: center;
    }
    
    .save-all-container {
        flex-direction: column;
        align-items: center;
    }
    
    .save-all-foods-btn,
    .save-all-container .reset-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}