body {
    margin: 0;
    overflow: hidden;
    font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Roboto, sans-serif;
}

/* 封面样式 */
#cover {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 20, 30, 0.85);
    backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 1s ease;
    cursor: pointer;
}

.cover-content {
    text-align: center;
    color: white;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease-out;
}

.cover-content h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #fff, #aaffdd);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.cover-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

#enterBtn {
    background: rgba(100, 180, 120, 0.9);
    border: none;
    padding: 12px 32px;
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    border-radius: 50px;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: transform 0.2s, background 0.2s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

#enterBtn:hover {
    background: rgba(80, 160, 100, 1);
    transform: scale(1.02);
}

.credit {
    margin-top: 2rem;
    font-size: 0.8rem;
    opacity: 0.6;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 原信息面板样式 */
#info {
    position: absolute;
    bottom: 20px;
    left: 20px;
    z-index: 100;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    padding: 12px 24px;
    border-radius: 30px;
    color: white;
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
    border-left: 4px solid #6aaf6a;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: opacity 0.5s;
}

#info h2 {
    margin: 0 0 4px 0;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

#info p {
    margin: 0;
    font-size: 0.8rem;
    opacity: 0.8;
}

/* 返回封面按钮 */
#backBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 200;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    border: none;
    padding: 10px 20px;
    border-radius: 40px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    border-left: 3px solid #ffaa66;
}

#backBtn:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: scale(1.02);
}

#loading-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 12px 24px;
    border-radius: 40px;
    font-family: monospace;
    font-size: 1rem;
    z-index: 200;
    backdrop-filter: blur(4px);
    pointer-events: none;
    white-space: nowrap;
    transition: opacity 0.3s;
}

@media (max-width: 600px) {
    .cover-content h1 {
        font-size: 2rem;
    }
    .cover-content p {
        font-size: 1rem;
    }
    #enterBtn {
        padding: 10px 24px;
        font-size: 1rem;
    }
    #info {
        bottom: 15px;
        left: 15px;
        padding: 8px 16px;
    }
    #info h2 { font-size: 1rem; }
    #info p { font-size: 0.7rem; }
    #backBtn {
        bottom: 15px;
        right: 15px;
        padding: 6px 14px;
        font-size: 0.8rem;
    }
}