/* 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: 1.8;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: #fff;
    padding: 2rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 1.5rem;
    color: #2563eb;
    text-align: center;
}

/* 主内容区 */
main {
    padding: 2rem 0 4rem;
}

/* FAQ 容器 */
.faq-container {
    background: transparent;
}

.faq-category {
    margin-bottom: 3rem;
}

/* 分类标题 */
.category-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid #2563eb;
}

.category-icon {
    font-size: 1.8rem;
}

.category-name {
    font-size: 1.6rem;
    color: #1f2937;
    font-weight: 600;
}

/* FAQ 项目 */
.faq-item {
    background: #fff;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow: hidden;
}

.faq-question {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #1f2937;
    font-size: 1.05rem;
    user-select: none;
    background: #fff;
    transition: background-color 0.2s;
}

.faq-question:hover {
    background: #f9fafb;
}

.toggle-icon {
    font-size: 1.2rem;
    transition: transform 0.3s;
    color: #2563eb;
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-item.active .toggle-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    padding: 0 1.5rem;
    color: #4b5563;
    line-height: 2;
    white-space: pre-wrap;
}

.faq-item.active .faq-answer {
    max-height: 2000px;
    padding: 0 1.5rem 1.5rem;
}

/* 底部 */
.footer {
    background: #1f2937;
    color: #fff;
    padding: 1.5rem 0;
    text-align: center;
    margin-top: 3rem;
}

.footer a {
    color: #fff;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.2rem;
    }

    .category-name {
        font-size: 1.3rem;
    }

    .faq-question {
        font-size: 1rem;
        padding: 1rem 1.25rem;
    }

    .faq-answer {
        padding: 0 1.25rem;
    }

    .faq-item.active .faq-answer {
        padding: 0 1.25rem 1.25rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}