/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary-green: #88c9a1;
    --light-green: #c5e6d2;
    --accent-pink: #f5b5c5;
    --light-pink: #fde7ee;
    --dark-gray: #4a4a4a;
    --medium-gray: #9b9b9b;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

body {
    background-color: var(--light-gray);
    color: var(--dark-gray);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    overflow-x: hidden;
}

/* 页面通用样式 */
.page {
    display: none;
    min-height: 100vh;
    padding: 20px 15px 80px;
    width: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.page.active {
    display: block;
    opacity: 1;
}

.page-header {
    text-align: center;
    margin-bottom: 30px;
    padding-top: 20px;
}

.logo {
    display: inline-flex;
    align-items: center;
    margin-bottom: 15px;
    color: var(--primary-green);
    font-weight: 700;
    font-size: 1.4rem;
}

.logo i {
    margin-right: 8px;
    font-size: 1.8rem;
}

.page-title {
    font-size: 1.8rem;
    color: var(--dark-gray);
    margin-bottom: 10px;
    font-weight: 600;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--medium-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 28px;
    background-color: var(--primary-green);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
    box-shadow: var(--shadow);
}

.btn:hover {
    background-color: #76b48f;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #e3a1b1;
}

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

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

/* 首页样式 */
.hero-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, rgba(197, 230, 210, 0.2) 0%, rgba(245, 181, 197, 0.1) 100%);
    border-radius: 20px;
    margin-bottom: 30px;
}

.hero-title {
    font-size: 2.2rem;
    color: var(--dark-gray);
    margin-bottom: 15px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--medium-gray);
    max-width: 600px;
    margin-bottom: 30px;
}

.hero-image {
    max-width: 300px;
    margin: 30px auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 食谱选择页面样式 */
.plan-cards {
    display: flex;
    flex-direction: column;
    gap: 25px;
    max-width: 800px;
    margin: 0 auto;
}

.plan-card {
    background-color: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.plan-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.plan-card-header {
    padding: 25px 25px 15px;
    border-bottom: 1px solid var(--light-gray);
}

.plan-card-title {
    font-size: 1.5rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
    font-weight: 600;
}

.plan-card-subtitle {
    font-size: 1rem;
    color: var(--medium-gray);
}

.plan-card-body {
    padding: 20px 25px;
}

.plan-card-desc {
    font-size: 0.95rem;
    margin-bottom: 20px;
    color: var(--dark-gray);
}

.pilates-tip {
    background-color: var(--light-pink);
    padding: 15px;
    border-radius: 12px;
    font-style: italic;
    position: relative;
    border-left: 4px solid var(--accent-pink);
}

.pilates-tip:before {
    content: "普拉提关联点";
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-pink);
    margin-bottom: 5px;
    font-style: normal;
}

.plan-card-footer {
    padding: 0 25px 25px;
    text-align: center;
}

/* 食谱详情页样式 */
.recipe-principles {
    background-color: var(--light-green);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
}

.principles-title {
    font-size: 1.3rem;
    color: var(--dark-gray);
    margin-bottom: 15px;
    font-weight: 600;
}

.principles-list {
    list-style-type: none;
}

.principles-list li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.principles-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: bold;
}

.week-navigation {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 10px;
}

.day-btn {
    padding: 10px 15px;
    background-color: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: 10px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    margin-right: 8px;
}

.day-btn.active {
    background-color: var(--primary-green);
    color: white;
    border-color: var(--primary-green);
}

.day-content {
    display: none;
    background-color: var(--white);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
}

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

.day-title {
    font-size: 1.5rem;
    color: var(--dark-gray);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-gray);
}

.meal-time {
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.meal-content {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--light-gray);
}

.meal-content:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.pilates-note {
    background-color: var(--light-pink);
    padding: 15px;
    border-radius: 12px;
    margin-top: 25px;
    font-style: italic;
    border-left: 4px solid var(--accent-pink);
}

.pilates-note:before {
    content: "普拉提小贴士";
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-pink);
    margin-bottom: 5px;
    font-style: normal;
}

/* 知识页面样式 */
.knowledge-section {
    background-color: var(--white);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
}

.knowledge-title {
    font-size: 1.5rem;
    color: var(--dark-gray);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.knowledge-title i {
    margin-right: 10px;
    color: var(--primary-green);
}

.knowledge-content p {
    margin-bottom: 15px;
}

.qa-item {
    margin-bottom: 20px;
    border-left: 3px solid var(--primary-green);
    padding-left: 15px;
}

.question {
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.answer {
    color: var(--medium-gray);
}

/* 底部导航栏 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--medium-gray);
    font-size: 0.8rem;
    transition: var(--transition);
    flex: 1;
}

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

.nav-item i {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mt-30 {
    margin-top: 30px;
}

.mb-20 {
    margin-bottom: 20px;
}

.mb-30 {
    margin-bottom: 30px;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 响应式调整 */
@media (min-width: 768px) {
    .page {
        padding: 30px 40px 100px;
        max-width: 900px;
        margin: 0 auto;
    }
    
    .plan-cards {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .plan-card {
        flex: 1 1 calc(50% - 25px);
        min-width: 300px;
    }
    
    .week-navigation {
        justify-content: center;
    }
    
    .day-btn {
        margin: 0 5px;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
}