* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

.chat-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 70vh;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    background: #f8f9fa;
}

.message {
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-content {
    padding: 15px 20px;
    border-radius: 15px;
    max-width: 80%;
    line-height: 1.6;
}

.user-message .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 5px;
}

.bot-message .message-content {
    background: white;
    color: #333;
    border: 1px solid #e0e0e0;
    border-bottom-left-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.bot-message .message-content p {
    margin-bottom: 10px;
}

.bot-message .message-content p:last-child {
    margin-bottom: 0;
}

.input-container {
    padding: 20px;
    background: white;
    border-top: 1px solid #e0e0e0;
}

#userInput {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    resize: none;
    transition: border-color 0.3s;
}

#userInput:focus {
    outline: none;
    border-color: #667eea;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

button {
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

.send-btn {
    flex: 1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.send-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.clear-btn {
    background: #f44336;
    color: white;
}

.clear-btn:hover {
    background: #d32f2f;
    transform: translateY(-2px);
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 滚动条样式 */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }
    
    .chat-container {
        height: 75vh;
    }
    
    .message-content {
        max-width: 90%;
    }
}

/* 图片容器样式 */
.images-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.image-wrapper {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.image-wrapper:hover {
    transform: scale(1.02);
}

.image-wrapper img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.image-caption {
    padding: 8px;
    background: rgba(0,0,0,0.7);
    color: white;
    font-size: 12px;
    text-align: center;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
}

/* 单张图片时占满宽度 */
.images-container:has(.image-wrapper:only-child) {
    grid-template-columns: 1fr;
}

.images-container:has(.image-wrapper:only-child) .image-wrapper img {
    height: 300px;
}