/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 导航栏 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h1 {
    color: #008000;
    font-size: 1.5rem;
}

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

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #ff9e1b;
}

/* Banner 区域 */
.banner-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.banner-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.banner-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: #ff9e1b;
    color: white;
}

.btn-primary:hover {
    background-color: #ff8c00;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

/* 章节样式 */
.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #333;
}

.features-section,
.price-section,
.faq-section,
.promo-section {
    padding: 4rem 0;
    background-color: #fff;
    margin-bottom: 2rem;
}

/* 特色卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

.feature-card p {
    color: #666;
    font-size: 0.9rem;
}

/* 价格列表 */
.price-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.price-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #008000;
}

.price-item h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.price-item .price {
    font-size: 1.5rem;
    color: #ff9e1b;
    font-weight: bold;
    margin: 0.5rem 0;
}

.price-item .description {
    color: #666;
    font-size: 0.9rem;
}

/* FAQ 列表 */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #f8f9fa;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.faq-item:hover {
    background: #e9ecef;
}

.faq-item h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.faq-item p {
    color: #666;
    margin-top: 0.5rem;
}

/* 优惠列表 */
.promo-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.promo-card {
    background: linear-gradient(135deg, #ff9e1b 0%, #ff8c00 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
}

.promo-card h3 {
    margin-bottom: 1rem;
}

.promo-card p {
    opacity: 0.9;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: #666;
}

/* 页脚 */
.footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }

    .banner-content h2 {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .price-list,
    .promo-list {
        grid-template-columns: 1fr;
    }
}