* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    color: #333;
    line-height: 1.6;
    font-size: 1rem; /* 16px */
}

a {
    text-decoration: none;
    color: inherit;
}

ul, li {
    list-style: none;
}

/* 全站通用容器样式 */
.container {
    width: 100%;
    max-width: 75rem; /* 1200px */
    margin: 0 auto;
    padding: 0 0.9375rem; /* 15px */
    position: relative;
}

/* 通用区块间距 */
section {
    padding: 5rem 0;
}

/* 标题样式 */
.section-title,
.brand-title {
    font-size: 2.5rem; /* 40px */
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 1rem;
    text-align: center;
    line-height: 1.4;
}

.section-subtitle,
.brand-subtitle {
    font-size: 1rem;
    color: #666;
    margin-bottom: 3.75rem;
    text-align: center;
    line-height: 1.6;
    max-width: 40rem;
    margin-left: auto;
    margin-right: auto;
}

/* 品牌强调文本 */
.brand-title span,
.section-title span {
    color: #006FFF;
}

/* 响应式调整 */
@media (max-width: 75rem) { /* 1200px */
    .section-title,
    .brand-title {
        font-size: 2.25rem;
    }
}

@media (max-width: 64rem) { /* 1024px */
    section {
        padding: 4rem 0;
    }
    
    .section-title,
    .brand-title {
        font-size: 2rem;
    }
    
    .section-subtitle,
    .brand-subtitle {
        font-size: 0.9375rem;
        margin-bottom: 3rem;
    }
}

@media (max-width: 48rem) { /* 768px */
    section {
        padding: 3rem 0;
    }
    
    .section-title,
    .brand-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle,
    .brand-subtitle {
        font-size: 0.875rem;
        margin-bottom: 2.5rem;
    }
    
    .container {
        padding: 0 1.25rem; /* 增加移动端内边距 */
    }
}

/* 小屏幕移动设备优化 */
@media (max-width: 30rem) { /* 480px */
    body {
        font-size: 0.9375rem;
    }
    
    section {
        padding: 2.5rem 0;
    }
    
    .section-title,
    .brand-title {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }
    
    .section-subtitle,
    .brand-subtitle {
        font-size: 0.8125rem;
        margin-bottom: 2rem;
    }
    
    /* 改善移动端表单样式 */
    input, 
    textarea, 
    select, 
    button {
        font-size: 16px !important; /* 防止iOS自动缩放 */
    }
    
    /* 提高移动端可点击区域 */
    a, button {
        min-height: 44px;
        min-width: 44px;
    }
}

/* 辅助类 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}