/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
}

/* 语言切换按钮样式 */
.language-switch {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1.5rem;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.9rem;
    color: #7f8c8d;
    background-color: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.8);
    color: #2c3e50;
}

.lang-btn.active {
    background-color: white;
    color: #3498db;
    font-weight: bold;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 头部样式 */
header {
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    color: #7f8c8d;
}

/* Logo样式 */
.logo-container {
    margin-bottom: 2rem;
}

.logo-card {
    display: inline-block;
    background-color: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.logo {
    width: 150px;
    height: 150px;
    object-fit: contain;
}

/* App信息样式 */
.app-info {
    margin-bottom: 2.5rem;
}

.description {
    font-size: 1.1rem;
    color: #34495e;
    margin-bottom: 0.8rem;
}

.features {
    font-size: 1rem;
    color: #7f8c8d;
    margin-bottom: 0.8rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.features i {
    color: #3498db;
    margin-right: 0.3rem;
}

.version {
    font-size: 0.9rem;
    color: #95a5a6;
}

/* 下载按钮样式 */
.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    min-width: 180px;
}

.download-btn i {
    margin-right: 0.8rem;
    font-size: 1.5rem;
}

.android {
    background-color: #3498db;
    color: white;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

.android:hover {
    background-color: #2980b9;
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.6);
    transform: translateY(-2px);
}

.ios {
    background-color: #2c3e50;
    color: white;
    box-shadow: 0 4px 15px rgba(44, 62, 80, 0.4);
}

.ios:hover {
    background-color: #1a2530;
    box-shadow: 0 6px 20px rgba(44, 62, 80, 0.6);
    transform: translateY(-2px);
}

.disabled {
    background-color: #95a5a6;
    box-shadow: none;
    cursor: not-allowed;
    opacity: 0.7;
}

.disabled:hover {
    background-color: #95a5a6;
    box-shadow: none;
    transform: none;
}

/* 页脚样式 */
footer {
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }
    
    .logo {
        width: 120px;
        height: 120px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .download-btn {
        width: 100%;
        max-width: 250px;
    }
    
    .container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .logo {
        width: 100px;
        height: 100px;
    }
    
    .logo-card {
        padding: 1.5rem;
    }
}