body {
    margin: 0;
    background-color: #F0F8FF; /* 米白色背景 */
    display: flex;
    justify-content: center;
    min-height: 100vh;
    flex-direction: column;
    color: #001F5C; /* 纯黑文本 */
}

.container {
    max-width: 720px;
    width: 100%;
    background-color: #F0F8FF; /* 与背景同色 */
    border-top: 4px solid #001F5C; /* 仅保留顶部边框 */
    border-bottom: 4px solid #001F5C; /* 仅保留底部边框 */
    box-shadow: none; /* 移除阴影 */
    margin: 0 auto; /* 移除顶部和底部外边距 */
    border-radius: 0; /* 移除圆角 */
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

header {
    background-color: #000A2E; /* 纯黑背景 */
    color: #F5FAFF;
    text-align: left;
    padding: 10px 25px;
    font-size: 1.8em; /* 调小字体 */
    border-bottom: 4px solid #001F5C;
}

header a {
    color: white;
    text-decoration: none;
}

main {
    padding: 20px;
    flex-grow: 1;
}

main h1, main h2, main h3 {
    color: #001F5C; /* 模块标题为黑色 */
    border-bottom: 4px solid #001F5C;
    padding-bottom: 10px;
    margin-bottom: 20px;
    font-size: 1.2em; /* 进一步调小字体 */
}

main p {
    margin-bottom: 1em;
    line-height: 1.6;
}

footer {
    background-color: #001F5C; /* 纯黑背景 */
    color: white;
    text-align: center;
    padding: 20px 0;
    font-size: 1em; /* 调小字体 */
    border-top: 4px solid #001F5C;
}

footer p {
    margin: 5px 0 0;
}

footer a {
    color: #1E90FF; /* 青色链接 */
    text-decoration: underline;
}

footer a:hover {
    color: #FF8C00; /* 品红悬停 */
}

/* 游戏模块 */
.game-module {
    border: 4px solid;
    padding: 0 10px 20px 10px; /* 减小上方的 padding */
    margin-bottom: 30px;
    background-color: transparent !important; /* 强制透明背景 */
}

.module-1 { border-color: #FF8C00; } /* 品红 */
.module-2 { border-color: #1E90FF; } /* 青色 */
.module-3 { border-color: #FFB347; } /* 亮黄 */
.module-4 { border-color: #FF7F50; } /* 亮绿 */

/* Common game card styles */
.game-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

@media (max-width: 480px) {
    .game-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

.game-card {
    display: block;
    background-color: #F0F8FF;
    border: 4px solid #001F5C;
    border-radius: 0;
    overflow: hidden;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    box-shadow: none;
}

.game-card img {
    width: 100%;
    height: 100px;
    object-fit: cover;
    display: block;
    border-bottom: 4px solid #001F5C;
}

.game-card p {
    color: #001F5C;
    padding: 10px;
    margin: 0;
    font-size: 1em; /* 调小字体 */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: normal;
}