* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    /* 设置黑金背景图，并全屏铺满 */
    background: url('images/background.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #fff;  /* 全局文字白色 */
}

/* 半透明黑色遮罩层，提高文本可读性 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    z-index: -1;
}

header {
    background: rgba(21,21,21,0.9);  /* 半透明深色背景 */
    padding: 20px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #d4af37;  /* 金色边框 */
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 60px;
    width: auto;
    /* 使用透明背景白色文字的 logo 图，无需滤镜 */
}

.logo span {
    color: #fff;    /* 文字改为白色 */
    font-size: 30px;
    font-weight: bold;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin-left: 20px;
}

.hero {
    text-align: center;
    padding: 120px 20px;
}

.hero h1 {
    color: #d4af37;  /* 金色大标题 */
    font-size: 60px;
}

.hero h2 {
    margin-top: 10px;
}

.hero p {
    margin-top: 25px;
    line-height: 1.8;
    color: #cccccc;
}

.buttons {
    margin-top: 40px;
}

.btn {
    display: inline-block;
    padding: 15px 35px;
    text-decoration: none;
    border-radius: 8px;
    margin: 10px;
    font-weight: bold;
}

.gold {
    background: #d4af37;
    color: black;
}

.black {
    background: #222;
    color: white;
    border: 1px solid #d4af37;
}

.about {
    padding: 80px 8%;
    text-align: center;
}

.about h2,
.download h2 {
    color: #d4af37;
    margin-bottom: 10px;
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 25px;
    margin-top: 40px;
}

.card {
    width: 300px;
    background: rgba(28,28,28,0.85);
    padding: 25px;
    border: 1px solid #d4af37;
    border-radius: 10px;
}

.card h4 {
    color: #d4af37;
    margin-bottom: 10px;
}

.card p {
    margin-bottom: 20px;
    color: #ccc;
}

.download {
    text-align: center;
    padding: 80px 20px;
    background: rgba(21,21,21,0.85);
}

.download p {
    margin: 25px 0;
    color: #ccc;
}


footer {
    background: rgba(17,17,17,0.9);
    text-align: center;
    padding: 30px;
    border-top: 1px solid #d4af37;
    color: #999;
}