body {
    margin: 0;
    padding: 0;
    height: 100vh;
    font-family: Arial, sans-serif;
    display: flex;
    align-items: center;
    flex-direction: column;
}
img {
    vertical-align: middle;
}
a:hover {
    filter: brightness(85%);
}

.top-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}
.github {
    background-color: #F0F0F0;
    text-align: center;
    font-size: 1em;
    width: 190px;
    text-decoration: none;
    padding: 0;
    transition: background 0.3s ease;
    color: black;
}

.btn {
    display: inline-block;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 1em;
    font-weight: bold;
    margin: 10px 0;
    transition: background 0.3s ease;
    color: white;
}
.btn:hover {
    transform: scale(1.05);
}
.btn:active {
    transform: scale(0.98);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.btn-map {
    background-color: #01B0F1;
}
.btn-rainbow {
    background: linear-gradient(90deg, #ff6ec4, #7873f5, #2afadf, #00ffd5);
    background-size: 150% 100%;
}
.btn-treasure {
    background-color: #cc9a00;
}

.coming {
    text-align: center;
    color: #8898aa;
    font-style: italic;
}

/* 响应式设计*/
@media (max-width: 768px) {
    .btn {
        font-size: 1.1em;
        padding: 14px 28px;
    }

    .github {
        font-size: 1.05em;
    }
}