/* 重置默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 页面布局和全局样式 */
body {
    font-family: Arial, sans-serif;
    background-color: #121212;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    height: auto;
    padding-bottom: 50px;
    overflow-x: hidden;
}

/* 页面容器 */
.container {
    text-align: center;
    width: 80%;
    max-width: 1200px;
    padding-top: 20px;
}

/* 页头 */
header h1 {
    font-size: 3rem;
    color: #00eaff;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: color 0.3s ease;
}

header p {
    font-size: 1.5rem;
    color: #777;
}

/* 导航菜单 */
nav ul {
    list-style-type: none;
    padding: 10px 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: #00eaff;
    font-size: 1.2rem;
    transition: color 0.3s, transform 0.3s ease;
}

nav ul li a:hover {
    color: #34b7f1;
    transform: scale(1.1);
}

/* 下载区 */
.download-section {
    margin-top: 40px;
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.download-section.visible {
    opacity: 1;
}

.download-section h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #00eaff;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* 按钮样式 */
.download-btn {
    padding: 12px 30px;
    font-size: 1.2rem;
    text-decoration: none;
    border-radius: 50px;
    color: #fff;
    background-color: #00eaff;
    transition: background-color 0.3s, transform 0.3s ease;
}

.download-btn:hover {
    background-color: #34b7f1;
    transform: translateY(-5px);
}

/* 按钮颜色 */
.android {
    background-color: #34b7f1;
}

.windows {
    background-color: #0078d4;
}

.mac {
    background-color: #1d1d1d;
}

/* 视频展示区 */
.video-section {
    margin-top: 50px;
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.video-section.visible {
    opacity: 1;
}

video {
    width: 100%;
    max-width: 800px;
    border-radius: 10px;
}

/* 公告信息区 */
.notice {
    margin-top: 50px;
    background-color: #222;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

.notice.visible {
    opacity: 1;
}

.notice h2 {
    font-size: 2rem;
    color: #00eaff;
    margin-bottom: 20px;
}

.notice p {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #ddd;
}

/* 页脚 */
footer {
    margin-top: 50px;
    font-size: 0.9rem;
    color: #777;
}