* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "微软雅黑", sans-serif;
    padding: 30px;
    background-color: #f7f7f7;
}
/* 顶部标题栏 */
.top-head {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    margin-bottom: 40px;
}
.site-title {
    font-size: 48px;
    font-weight: bold;
    color: #2c3e50;
    letter-spacing: 6px;          /* 字间距拉开，更大气 */
    text-shadow: 1px 1px 3px rgba(0,0,0,0.15);
}
.login-link {
    position: absolute;
    right: 50px;
    font-size: 16px;
    color: #666;
    text-decoration: none;
}
.login-link:hover {
    color: #0066cc;
}
/* 主体左右布局 */
.main-wrap {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 60px;
}
/* 左侧按钮组 */
.btn-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.menu-btn {
    width: 120px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    text-decoration: none;
    color: #fff;
    border-radius: 8px;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}
.menu-btn:hover {
    opacity: 0.9;
}
/* 中间大图预留位置 */
.banner-box {
    width: 800px;
    height: 300px;
    border: 1px solid #eee;
    background: #f9f9f9;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 18px;
}
/* 底部版权信息 */
footer {
    text-align: center;
    margin-top: 60px;
    padding: 20px 0;
    color: #666;
    font-size: 14px;
    border-top: 1px solid #eee;
}
footer p {
    margin: 8px 0;
}