/* 全局样式 */
:root {
    --primary-color: #007bff;
    --light-primary-color: #e6f2ff;
    --background-color: #f4f7f9;
    --container-bg-color: #ffffff;
    --user-msg-bg: #007bff;
    --ai-msg-bg: #e9e9eb;
    --text-color: #333;
    --light-text-color: #ffffff;
    --system-msg-color: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --danger-color: #dc3545;
    --success-color: #28a745;
}

html, body {
    height: 100%;
    margin: 0;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

#chat-container {
    width: 100%;
    max-width: 800px;
    height: 100%; 
    max-height: 95vh;
    background-color: var(--container-bg-color);
    border-radius: 16px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0; 
}

.chat-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-color);
}

.chat-header button {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--system-msg-color);
    cursor: pointer;
    padding: 5px;
}

#chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    max-width: 80%;
}

.message p {
    margin: 0;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word; 
}

/* 采用容器包裹技术，兼容QQ浏览器 */
.message .avatar {
    width: 40px;
    height: 40px;
    min-width: 40px;
    flex-shrink: 0;
    border-radius: 50%;
    overflow: hidden; /* 关键：隐藏超出容器的部分 */
    background-color: var(--border-color);
}

.message .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* 保证图片不变形地填满容器 */
}

.message.ai { align-self: flex-start; }
.message.ai p { background-color: var(--ai-msg-bg); color: var(--text-color); border-top-left-radius: 4px;}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.message.user p { background-color: var(--user-msg-bg); color: var(--light-text-color); border-top-right-radius: 4px; }

.message.system {
    align-self: center;
    background-color: #f0f0f0;
    color: var(--system-msg-color);
    padding: 8px 15px;
    border-radius: 12px;
    font-size: 0.9rem;
    max-width: fit-content;
}
.message.system p { padding: 0; }

.message.loading p { display: flex; gap: 5px; }
.message.loading .dot {
    width: 8px;
    height: 8px;
    background-color: #999;
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}
.message.loading .dot:nth-child(1) { animation-delay: -0.32s; }
.message.loading .dot:nth-child(2) { animation-delay: -0.16s; }
@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

.chat-input-area {
    display: flex;
    align-items: center;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    gap: 10px;
    flex-shrink: 0;
}

.chat-input-area textarea {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    resize: none;
    font-size: 1rem;
    max-height: 100px;
    overflow-y: auto;
}

.chat-input-area button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s;
    flex-shrink: 0;
}
.chat-input-area button:hover { background-color: #0056b3; }
.chat-input-area button:disabled { background-color: #a0a0a0; cursor: not-allowed; }
#reset-btn { background-color: #6c757d; }
#reset-btn:hover { background-color: #5a6268; }

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 15px;
    box-sizing: border-box;
}

.modal-content {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.modal-header h3 { margin: 0; }
.close-btn { background: none; border: none; font-size: 1.8rem; cursor: pointer; color: #888; }

.input-group { margin-bottom: 15px; }
.input-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.input-group input, .input-group select, .input-group textarea {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}
.input-group textarea { min-height: 120px; }

.modal-footer { text-align: right; margin-top: 20px; }
.save-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
}
.save-btn:hover { background-color: #0056b3; }

.avatar-settings {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.avatar-upload-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.avatar-upload-group label {
    font-weight: bold;
    color: #495057;
}

.avatar-preview-container {
    position: relative;
    cursor: pointer;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    overflow: hidden;
}

.avatar-preview {
    width: 100%;
    height: 100%;
    border: 3px solid #fff;
    box-sizing: border-box;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    object-fit: cover;
    transition: transform 0.2s ease-in-out;
}

.avatar-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
}

.avatar-preview-container:hover .avatar-preview {
    transform: scale(1.05);
}

.avatar-preview-container:hover .avatar-overlay {
    opacity: 1;
}

.avatar-buttons {
    display: flex;
    gap: 8px;
}

.avatar-buttons .remove-btn {
    background-color: #6c757d;
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.avatar-buttons .remove-btn:hover {
    background-color: var(--danger-color);
}

@media (max-width: 768px) {
    body {
        align-items: flex-start; 
    }
    #chat-container {
        height: 100%; 
        max-height: 100vh;
        border-radius: 0; 
        box-shadow: none; 
    }
    .message {
        max-width: 90%; 
    }
    .chat-header h2 {
        font-size: 1.1rem; 
    }
    
    /* 【变更】让头像设置在手机上并排显示，并优化间距 */
    .avatar-settings {
        flex-direction: row; /* 强制横向排列 */
        align-items: flex-start; /* 顶部对齐 */
        padding: 15px;
        gap: 15px;
    }

    .avatar-preview-container {
        width: 80px;
        height: 80px;
    }
}