* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(-45deg, #ff9a9e, #fad0c4, #fad0c4, #ff9a9e);
    background-size: 400% 400%;
    animation: gradient 10s ease infinite;
    color: #fff;
    overflow: hidden;
}

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

h1 {
    text-align: center;
    margin: 20px 0;
}

.photo-wall-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 5;
}

.photo-wall {
    width: 300px;
    height: 300px;
    position: relative;
}

.photo-item {
    width: 50px;
    height: 50px;
    position: absolute;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease, left 1s ease, top 1s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.photo-item:hover {
    transform: scale(1.1);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 15;
}

.overlay.active {
    display: flex;
}

.overlay-img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 10px;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2rem;
    color: white;
    cursor: pointer;
}

.fireworks-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

/* 音乐控制按钮 */
.music-control {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 20;
}

#musicBtn {
    background-color: rgba(255, 255, 255, 0.8);
    color: #333;
    border: none;
    border-radius: 20px;
    padding: 10px 15px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

#musicBtn:hover {
    background-color: rgba(255, 255, 255, 1);
}