/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    scroll-behavior: smooth;
}

section {
    scroll-margin-top: 80px;
}

/* 通用标题样式 */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
}

/* 通用按钮样式 */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: #1a73e8;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #1557b0;
}