:root {
    --primary-color: #4CAF50;
    --bg-color: #f5f7fa;
    --chat-bg: #ffffff;
    --text-color: #333333;
    --border-color: #e1e4e8;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    height: 100vh;
}

.app-layout {
    display: flex;
    width: 100%;
    max-width: 1400px;
    height: 100%;
    background-color: var(--chat-bg);
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.sidebar {
    width: 260px;
    background-color: #f8f9fa;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow-y: auto;
}

.right-sidebar {
    border-right: none;
    border-left: 1px solid var(--border-color);
}

.new-btn {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

.new-btn:hover {
    background-color: #45a049;
}

.session-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.session-item {
    padding: 10px;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

.session-title {
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 5px;
}

.delete-session-btn {
    background: none;
    border: none;
    padding: 2px 5px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    color: #e74c3c;
    font-size: 14px;
}

.session-item:hover .delete-session-btn {
    opacity: 0.7;
}

.delete-session-btn:hover {
    opacity: 1 !important;
    transform: scale(1.2);
}

.session-item:hover, .session-item.active {
    background-color: #e8f5e9;
    border-color: var(--primary-color);
}

.session-item.active .delete-session-btn {
    color: #c0392b;
}

.user-profile h3, .user-profile h4 {
    margin-bottom: 15px;
    margin-top: 0;
    color: var(--text-color);
}

.level-section {
    margin-bottom: 20px;
}

.level-section select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.history-list li {
    background: #fff;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 8px;
    font-size: 13px;
}

.container.main-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow: none;
    max-width: none;
}

header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background-color: #fff;
}

header h1 {
    margin: 0;
    color: var(--primary-color);
    font-size: 24px;
}

header p {
    margin: 5px 0 0;
    color: #666;
    font-size: 14px;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-container {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 8px;
    line-height: 1.5;
    word-wrap: break-word;
}

.bot-message {
    align-self: flex-start;
    background-color: #f0f2f5;
    color: #1c1e21;
    border-bottom-left-radius: 0;
}

.user-message {
    align-self: flex-end;
    background-color: var(--primary-color);
    color: white;
    border-bottom-right-radius: 0;
}

.input-area {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background-color: #fff;
}

.file-upload {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-btn {
    background-color: #f0f2f5;
    border: 1px solid var(--border-color);
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.upload-btn:hover {
    background-color: #e4e6e9;
}

#file-name {
    font-size: 14px;
    color: #666;
}

.text-input {
    display: flex;
    gap: 10px;
}

textarea {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    resize: none;
    font-family: inherit;
    font-size: 14px;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #45a049;
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.loading {
    align-self: flex-start;
    color: #666;
    font-style: italic;
    font-size: 14px;
}

/* 工具调用样式 */
.tool-calls-container {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tool-call-block {
    background-color: #f8f9fa;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    overflow: hidden;
    font-size: 13px;
}

.tool-call-header {
    background-color: #e9ecef;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #e1e4e8;
}

.tool-icon {
    font-size: 14px;
}

.tool-name {
    color: #495057;
}

.tool-call-details {
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tool-label {
    font-weight: bold;
    color: #6c757d;
    margin-bottom: 4px;
    font-size: 12px;
}

.tool-args pre, .tool-result pre {
    margin: 0;
    padding: 8px;
    background-color: #212529;
    color: #f8f9fa;
    border-radius: 4px;
    overflow-x: auto;
    max-height: 200px;
}

.tool-args code, .tool-result code {
    font-family: 'Consolas', 'Monaco', monospace;
    white-space: pre-wrap;
    word-break: break-all;
}

.message-text {
    margin-top: 5px;
}