.ul-signal a {
    display: inline-block;
    padding: 5px 13px; /* 按钮高度和宽度 */
    font-weight: 700;
    font-size: 14px;
    color: #f0f9f0; /* 浅绿色字体，和背景搭配柔和 */
    text-decoration: none;
    border-radius: 8px;
    background: linear-gradient(45deg, #43e97b, #38f9d7, #43e97b, #2ecc71);
    background-size: 400% 400%;
    animation: gradientShift 5s ease infinite, pulse 2s infinite;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    transition: transform 0.3s, box-shadow 0.3s;
}

.ul-signal a:hover {
    transform: scale(1.1) translateY(-2px);
    box-shadow: 0 8px 25px rgba(67,233,123,0.6), 0 0 15px rgba(56,249,215,0.3);
}

/* 渐变动画 */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 呼吸动画 */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}