body {
    background-color: #1a1a1a; /* 深色背景 */
    color: #ffffff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    max-width: 600px;
}

.main-icon {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 5px solid #00ffcc; /* 霓虹色边框 */
    box-shadow: 0 0 20px rgba(0, 255, 204, 0.5);
    margin-bottom: 30px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.btn {
    text-decoration: none;
    color: #fff;
    padding: 12px 40px;
    border: 1px solid #00ffcc;
    transition: 0.3s;
    font-size: 1.1em;
}

.btn:hover {
    background: #00ffcc;
    color: #1a1a1a;
    box-shadow: 0 0 15px #00ffcc;
}

.lang-switch {
    margin-bottom: 20px;
    font-size: 0.8em;
}

.lang-switch button {
    background: none;
    border: none;
    color: #00ffcc;
    cursor: pointer;
}

/* 画廊选择方块 */
.gallery-choice {
    display: flex;
    gap: 20px;
}

.choice-box {
    padding: 40px;
    border: 2px solid #fff;
    text-decoration: none;
    color: #fff;
    flex: 1;
}

.warning {
    border-color: #ff4d4d;
}

.warning:hover {
    background-color: #ff4d4d;
}
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); /* 自动适配屏幕宽度 */
    gap: 20px;
    padding: 20px;
}

.gallery-item {
    background: #2a2a2a;
    padding: 10px;
    border: 1px solid #444;
    transition: transform 0.2s;
}

.gallery-item:hover {
    transform: scale(1.05);
    border-color: #00ffcc;
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
}
/* 1. 基础按钮样式 (保持不变) */
.btn {
    display: inline-block;
    text-decoration: none;
    padding: 12px 40px;
    border: 1px solid #00ffcc;
    background: transparent;
    color: #fff;
    transition: 0.3s;
    cursor: pointer;
}
/* 4. 离开/返回按钮的样式 (可选，让它显得低调一点) */
.back-link {
    color: #666;
    transition: 0.3s;
}
.back-link:hover {
    color: #fff;
}