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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    overflow: hidden;
    height: 100vh;
    position: relative;
    background-color: #000;
}

.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('img/index_bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: -1;
}

.buttons-container {
    position: absolute;
    bottom: 10%;
    left: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 0 20px;
}

.btn {
    width: 65%;
    max-width: 400px;
    height: 80px;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 0;
    transition: transform 0.2s;
}

@media (min-width: 768px) {
    .background {
        background-size: auto 100%;
    }
}

.btn:hover {
    transform: scale(1.02);
}

.btn:active {
    transform: scale(0.98);
}

.btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.countdown {
    color: white;
    text-align: center;
    margin-top: 10px;
    font-size: 16px;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    width: 100%;
}