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

:root {
    --primary-color: #8B4513;
    --secondary-color: #D2691E;
    --accent-color: #CD853F;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #FAF8F5;
    --sidebar-bg: #F5F0E8;
    --border-color: #E8DCC8;
    --hover-color: #EDE8DC;
    --success-color: #52c41a;
    --error-color: #ff4d4f;
    --thinking-bg: #FFF8E7;
    --thinking-border: #DAA520;
    --ceramic-blue: #4A90A4;
    --ceramic-green: #6B8E6B;
    --ceramic-brown: #8B7355;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
}

.sidebar {
    width: 280px;
    background: linear-gradient(180deg, #F5EDE0 0%, #EDE5D8 100%);
    border-right: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    box-shadow: 2px 0 10px rgba(139, 69, 19, 0.1);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: linear-gradient(135deg, #FAF8F5 0%, #F5EDE0 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.1);
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.history-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 16px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding: 0 4px;
}

.history-header h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
}

.new-chat-btn {
    padding: 6px 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    padding: 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.history-item:hover {
    background: var(--hover-color);
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.1);
    transform: translateX(4px);
}

.history-item.active {
    background: linear-gradient(135deg, #FAF8F5 0%, #F5EDE0 100%);
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(205, 133, 63, 0.2);
}

.history-item-title {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-time {
    font-size: 0.75rem;
    color: var(--text-light);
}

.history-item-delete {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 20px;
    height: 20px;
    background: transparent;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.history-item:hover .history-item-delete {
    opacity: 1;
}

.history-item-delete:hover {
    background: var(--error-color);
    color: white;
}

.empty-history {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.user-info:hover {
    background: var(--hover-color);
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.1);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--ceramic-blue) 0%, var(--ceramic-green) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.user-details {
    flex: 1;
    overflow: hidden;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-email {
    font-size: 0.75rem;
    color: var(--text-light);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-color);
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 20px 40px;
    border-bottom: 1px solid var(--border-color);
    background: white;
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.05);
}

.chat-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-header h1::before {
    content: '🏺';
    font-size: 1.3rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
    background: var(--bg-color);
}

.message {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease;
}

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

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--ceramic-blue) 0%, var(--ceramic-green) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(74, 144, 164, 0.3);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
}

.message-content {
    max-width: 70%;
    padding: 16px 20px;
    background: white;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(139, 69, 19, 0.08);
    line-height: 1.8;
    font-size: 0.95rem;
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
}

.message-content p {
    margin-bottom: 12px;
}

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

.message-content ul,
.message-content ol {
    margin-left: 20px;
    margin-bottom: 12px;
}

.message-content li {
    margin-bottom: 6px;
}

.message-image {
    max-width: 100%;
    border-radius: 8px;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-8px);
    }
}

.thinking-content {
    background: var(--thinking-bg);
    border-left: 3px solid var(--thinking-border);
    padding: 14px 18px;
    margin-bottom: 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    line-height: 1.6;
    box-shadow: 0 2px 8px rgba(218, 165, 32, 0.1);
}

.thinking-label {
    font-weight: 600;
    color: var(--thinking-border);
    margin-bottom: 8px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.thinking-text {
    color: var(--text-light);
    font-style: italic;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.chat-input-container {
    padding: 20px 40px;
    background: white;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 8px rgba(139, 69, 19, 0.05);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 12px 16px;
    transition: all 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(205, 133, 63, 0.1);
}

.image-upload {
    display: flex;
    align-items: center;
}

.upload-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-light);
}

.upload-btn:hover {
    background: var(--hover-color);
    color: var(--accent-color);
}

.upload-icon {
    font-size: 1.3rem;
}

.image-preview {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-image {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 16px;
    height: 16px;
    border: none;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.remove-image:hover {
    background: var(--error-color);
}

.message-input {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-size: 0.95rem;
    font-family: inherit;
    line-height: 1.5;
    color: var(--text-color);
    outline: none;
    max-height: 150px;
    min-height: 40px;
}

.message-input::placeholder {
    color: var(--text-light);
}

.send-btn {
    padding: 10px 20px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.send-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(205, 133, 63, 0.3);
}

.send-btn:active {
    transform: translateY(0);
}

.send-icon {
    font-size: 0.9rem;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: white;
    border-radius: 16px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(139, 69, 19, 0.2);
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: all 0.2s ease;
}

.close-btn:hover {
    color: var(--primary-color);
}

.modal-body {
    text-align: center;
}

.modal-body p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(205, 133, 63, 0.3);
}

.error {
    color: var(--error-color);
    font-weight: 500;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }

    .chat-messages {
        padding: 30px;
    }

    .chat-input-container {
        padding: 16px 30px;
    }

    .message-content {
        max-width: 75%;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 60px;
        padding: 8px;
    }

    .sidebar-header,
    .history-header,
    .history-item-title,
    .history-item-time,
    .user-details {
        display: none;
    }

    .logo {
        padding: 8px;
        justify-content: center;
    }

    .logo-text {
        display: none;
    }

    .history-list {
        padding: 4px;
    }

    .history-item {
        padding: 8px;
        justify-content: center;
    }

    .user-info {
        padding: 8px;
        justify-content: center;
    }

    .chat-header {
        padding: 16px 20px;
    }

    .chat-header h1 {
        font-size: 1.2rem;
    }

    .chat-messages {
        padding: 20px;
    }

    .chat-input-container {
        padding: 12px 16px;
    }

    .input-wrapper {
        padding: 10px 12px;
    }

    .message-content {
        max-width: 85%;
        padding: 12px 16px;
        font-size: 0.9rem;
    }

    .message-avatar {
        width: 36px;
        height: 36px;
        font-size: 1.2rem;
    }

    .send-btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .upload-btn {
        width: 36px;
        height: 36px;
    }

    .image-preview {
        width: 40px;
        height: 40px;
    }

    .thinking-content {
        padding: 12px 14px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .chat-messages {
        padding: 16px;
    }

    .chat-input-container {
        padding: 10px 12px;
    }

    .input-wrapper {
        gap: 8px;
    }

    .message-content {
        max-width: 90%;
        padding: 10px 14px;
    }

    .send-btn {
        padding: 8px 12px;
    }
}