/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none !important;
    -webkit-tap-highlight-color: transparent;
    transition: all 0.3s ease;
}

:root {
    --main-blue: #1e90ff;
    --dark-bg: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
}

body {
    background: var(--dark-bg);
    color: var(--text-primary);
    font-family: 'Segoe UI', sans-serif;
    min-height: 100vh;
    line-height: 1.6;
}

/* 增强版菜单系统 */
#menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    font-size: 24px;
    color: #fff;
    cursor: pointer;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    width: 280px;
    height: 100vh;
    background: rgba(16, 24, 39, 0.98);
    backdrop-filter: blur(15px);
    padding: 80px 20px;
    transition: transform 0.4s;
    z-index: 999;
    box-shadow: 8px 0 32px rgba(0,0,0,0.2);
}

.sidebar.active {
    transform: translateX(280px);
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 20px;
    margin: 8px 0;
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    background: rgba(255,255,255,0.05);
    transition: all 0.3s;
}

.sidebar a:hover {
    background: rgba(255,255,255,0.1);
    transform: translateX(5px);
}

/* 统一容器样式 */
.main-container {
    max-width: 1200px;
    margin: 100px auto;
    padding: 0 20px;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

/* 卡片通用样式 */
.info-card, .download-item, .tutorial-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    transition: transform 0.3s;
}

.info-card:hover, .download-item:hover, .tutorial-card:hover {
    transform: translateY(-5px);
}

/* 下载页面优化 */
.download-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    background: var(--main-blue);
    border-radius: 8px;
    color: white;
    text-decoration: none;
    margin-top: 15px;
    transition: transform 0.2s;
}

.download-btn:hover {
    transform: translateY(-2px);
}

/* 聊天室终极修复 */
.chat-container {
    max-width: 800px;
    margin: 100px auto;
    padding: 0 20px;
}

#chat-box {
    height: 65vh;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 15px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.message-input {
    display: flex;
    gap: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    padding: 12px;
}

#message {
    flex: 1;
    background: transparent;
    border: none;
    color: inherit;
    padding: 0 15px;
}

#send-btn {
    width: 45px;
    height: 45px;
    background: var(--main-blue);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: grid;
    place-items: center;
}

#send-btn i {
    transform: rotate(45deg);
    font-size: 18px;
}

/* 教程页面增强 */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    margin-top: 20px;
}

.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 12px;
}

/* 捐赠页面美化 */
.donation-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    max-width: 600px;
    margin: 100px auto;
}

.qrcode-box {
    margin: 30px 0;
    padding: 20px;
    background: rgba(255,255,255,0.05);
    border-radius: 15px;
}

.qrcode-img {
    max-width: 300px;
    width: 100%;
    border-radius: 12px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        left: -100%;
    }
    
    .sidebar.active {
        transform: translateX(100%);
    }
    
    #menu-toggle {
        top: 15px;
        left: 15px;
    }
    
    .main-container {
        padding: 80px 15px;
    }
}