/* 全局滚动条美化 */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 2px;
}

/* 移动端优化 */
@media (max-width: 480px) {
    .message {
        max-width: 92% !important;
        font-size: 13px !important;
    }
    .header h1 {
        font-size: 14px !important;
    }
    .header button {
        font-size: 11px !important;
        padding: 4px 10px !important;
    }
    .input-area textarea {
        font-size: 13px !important;
    }
    .input-area button {
        font-size: 13px !important;
        padding: 8px 12px !important;
    }
}

/* 防止 iOS 缩放 */
@media (max-width: 480px) {
    input, textarea {
        font-size: 16px !important;
    }
}