:root {
    --primary-color: #4CAF50;
    --secondary-color: #45a049;
    --background-color: #f4f4f4;
    --text-color: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
}

.navbar {
    background-color: var(--primary-color);
    padding: 1rem;
    color: white;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
    background-color: white;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 1rem;
}

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

.result {
    margin-top: 2rem;
    padding: 1rem;
    border-left: 4px solid var(--primary-color);
    background: white;
}

.footer {
    text-align: center;
    padding: 1rem;
    background: #333;
    color: white;
    position: fixed;
    bottom: 0;
    width: 100%;
}

/* 添加食谱页面的特定样式 */
.ingredients-section,
.cooking-section,
.nutrition-section {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f9f9f9;
    border-radius: 4px;
}

.ingredients-section ul {
    list-style-position: inside;
    padding-left: 1rem;
}

.ingredients-section li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ingredients-section li:last-child {
    border-bottom: none;
}

.cooking-section {
    counter-reset: step-counter;
}

.cooking-section p {
    margin-bottom: 0.8rem;
    padding: 0.5rem 0;
    position: relative;
    padding-left: 2rem;
}

.cooking-section p:before {
    content: counter(step-counter);
    counter-increment: step-counter;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--primary-color);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.nutrition-section p {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.3rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid #eee;
}

.nutrition-section h4 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.nutrition-section h4:first-child {
    margin-top: 0;
}

.nutrition-details {
    padding-left: 1rem;
}

.nutrition-item {
    margin-bottom: 1rem;
}

.nutrition-item h5 {
    color: #666;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.nutrition-item p {
    color: #333;
    line-height: 1.6;
    margin-left: 1rem;
    position: relative;
}

.nutrition-item p::before {
    content: "•";
    position: absolute;
    left: -1rem;
    color: var(--primary-color);
}

/* 加载动画样式 */
.loading-spinner {
    display: none;
    text-align: center;
    margin: 2rem auto;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--background-color);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-text {
    margin-top: 1rem;
    color: var(--text-color);
    font-size: 0.9rem;
}

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

/* 添加淡入淡出效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.fade-out {
    animation: fadeOut 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* 营养分析网格布局 */
.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.nutrition-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.nutrition-card:hover {
    transform: translateY(-2px);
}

.nutrition-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
    font-size: 1.1rem;
}

.nutrition-content {
    color: var(--text-color);
    line-height: 1.6;
    font-size: 0.95rem;
    text-align: justify;
}

/* 营养分析样式优化 */
.nutrition-analysis-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.meal-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.meal-header {
    background-color: var(--primary-color);
    padding: 1rem;
}

.meal-header h4 {
    color: white;
    margin: 0;
    font-size: 1.1rem;
    text-align: center;
}

.meal-content {
    padding: 1.5rem;
}

.meal-content p {
    color: var(--text-color);
    margin-bottom: 0.8rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.meal-content p:last-child {
    margin-bottom: 0;
}

/* 推荐结果样式 */
.recommendation-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.meal-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.meal-title {
    color: var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
    font-size: 1.2rem;
}

.meal-details {
    display: grid;
    gap: 1rem;
}

.analysis-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 6px;
}

.analysis-item h4 {
    color: #666;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.analysis-item p {
    color: var(--text-color);
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
}

.overall-advice {
    grid-column: 1 / -1;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-top: 1rem;
}

.overall-advice h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.overall-advice p {
    line-height: 1.6;
    color: var(--text-color);
}

/* 营养分析卡片样式 */
.meal-analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin: 1rem 0;
}

.meal-analysis-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.meal-analysis-card:hover {
    transform: translateY(-2px);
}

.meal-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    position: relative;
}

.meal-header h3 {
    margin: 0;
    font-size: 1.2rem;
}

.meal-food {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.meal-analysis-content {
    padding: 1.5rem;
}

.analysis-section {
    margin-bottom: 1.5rem;
}

.analysis-section:last-child {
    margin-bottom: 0;
}

.analysis-section h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.analysis-section p {
    color: var(--text-color);
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
    text-align: justify;
}

/* 功能介绍卡片样式 */
.feature-intro {
    background: linear-gradient(to right, var(--primary-color), #2196F3);
    color: white;
    padding: 2rem;
    border-radius: 8px 8px 0 0;
    margin: -2rem -2rem 2rem -2rem;
    text-align: center;
}

.feature-intro h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.intro-text {
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.feature-intro i {
    margin-right: 0.5rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .container {
        padding: 0 0.5rem;
    }
    
    .nutrition-grid {
        grid-template-columns: 1fr;
    }
    
    .nutrition-card {
        padding: 1rem;
    }
    
    .nutrition-analysis-wrapper {
        grid-template-columns: 1fr;
    }
    
    .meal-card {
        margin-bottom: 1rem;
    }
    
    .meal-analysis-grid {
        grid-template-columns: 1fr;
    }
    
    .meal-analysis-card {
        margin-bottom: 1rem;
    }
    
    .feature-intro {
        padding: 1.5rem;
    }
    
    .feature-intro h2 {
        font-size: 1.5rem;
    }
    
    .intro-text {
        font-size: 1rem;
    }
}

/* 无数据状态 */
.no-data {
    text-align: center;
    color: #666;
    padding: 2rem;
    background: #f9f9f9;
    border-radius: 8px;
}

/* 个人信息页面样式 */
.health-stats {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.stat-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.stat-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-item p {
    font-size: 1.2rem;
    margin: 0.5rem 0;
}

#bmiValue {
    font-weight: bold;
    font-size: 1.5rem;
}

#bmiStatus {
    color: #666;
    font-size: 0.9rem;
}