/* AI推荐页面样式 - 左右布局 */

.recommend-main {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    height: calc(100vh - 80px);
    overflow: hidden;
}

/* ========== 左侧：AI 对话区域 ========== */
.ai-chat-section {
    flex: 2;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    min-width: 0;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.chat-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-weight: 600;
    font-size: 1rem;
}

.chat-title i {
    font-size: 1.2rem;
}

.clear-chat-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.clear-chat-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 聊天消息区 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    display: flex;
    gap: 0.8rem;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

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

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.user .message-avatar {
    background: var(--accent-blue);
    color: white;
    font-weight: 600;
}

.message-content {
    padding: 0.8rem 1rem;
    border-radius: 12px;
    line-height: 1.6;
    font-size: 0.9rem;
}

.message.assistant .message-content {
    background: #f0f2f5;
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.message.user .message-content {
    background: var(--accent-blue);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-content p {
    margin: 0 0 0.5rem 0;
}

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

.message-content ul {
    margin: 0.5rem 0;
    padding-left: 1.2rem;
}

.message-content li {
    margin: 0.3rem 0;
}

/* 打字指示器 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 0.8rem 1rem;
}

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

.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);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-4px);
        opacity: 1;
    }
}

/* 输入区域 */
.chat-input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background: #fafafa;
}

.chat-input-wrapper {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
}

#chat-input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
}

#chat-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(74, 134, 232, 0.1);
}

.send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.send-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 快捷操作 */
.quick-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.quick-btn {
    background: white;
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.quick-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(74, 134, 232, 0.05);
}

/* ========== 右侧：推荐书籍区域 ========== */
.recommend-books-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    min-width: 280px;
    max-width: 380px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.2rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.section-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
}

.section-header h2 i {
    color: var(--accent-blue);
}

.refresh-btn {
    background: var(--bg-secondary);
    border: none;
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.refresh-btn:hover {
    background: var(--accent-blue);
    color: white;
}

.refresh-btn.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 书籍列表 */
.books-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.books-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    height: 200px;
    color: var(--text-secondary);
}

.books-loading i {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

/* 推荐书籍卡片 - 紧凑版 */
.recommend-book-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 0.8rem;
    transition: all 0.3s ease;
}

.recommend-book-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.book-header {
    display: flex;
    gap: 0.8rem;
}

.book-cover-small {
    width: 60px;
    height: 85px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.book-cover-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info-compact {
    flex: 1;
    min-width: 0;
}

.book-info-compact h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.2rem 0;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-info-compact .author {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.book-info-compact .genre-tag {
    display: inline-block;
    font-size: 0.65rem;
    color: var(--accent-blue);
    background: rgba(74, 134, 232, 0.1);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
}

.book-reason {
    margin-top: 0.6rem;
    padding-top: 0.6rem;
    border-top: 1px dashed var(--border-color);
}

.book-reason-label {
    font-size: 0.7rem;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 0.2rem;
}

.book-reason-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-actions-compact {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.6rem;
}

.book-actions-compact .action-btn {
    flex: 1;
    padding: 0.35rem 0.5rem;
    font-size: 0.7rem;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
}

.book-actions-compact .btn-borrow {
    background: var(--accent-blue);
    color: white;
}

.book-actions-compact .btn-borrow:hover {
    background: #3a76d8;
}

.book-actions-compact .btn-borrow:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.book-actions-compact .btn-favorite {
    background: white;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.book-actions-compact .btn-favorite:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.book-actions-compact .btn-favorite.is-favorited {
    border-color: #e74c3c;
    color: #e74c3c;
}

/* 无推荐提示 */
.no-recommendations {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.no-recommendations i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: #ccc;
}

/* 滚动条样式 */
.chat-messages::-webkit-scrollbar,
.books-list::-webkit-scrollbar {
    width: 5px;
}

.chat-messages::-webkit-scrollbar-track,
.books-list::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb,
.books-list::-webkit-scrollbar-thumb {
    background: #ddd;
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.books-list::-webkit-scrollbar-thumb:hover {
    background: #bbb;
}

/* 响应式 */
@media (max-width: 900px) {
    .recommend-main {
        flex-direction: column;
        height: auto;
        min-height: calc(100vh - 80px);
    }
    
    .ai-chat-section {
        flex: none;
        height: 50vh;
        min-height: 400px;
    }
    
    .recommend-books-section {
        flex: none;
        max-width: none;
        min-width: auto;
        height: auto;
    }
    
    .books-list {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .recommend-book-card {
        flex: 1;
        min-width: 250px;
        max-width: calc(50% - 0.4rem);
    }
}

@media (max-width: 600px) {
    .recommend-main {
        padding: 1rem;
    }
    
    .recommend-book-card {
        max-width: 100%;
    }
    
    .message {
        max-width: 95%;
    }
    
    .quick-actions {
        justify-content: center;
    }
}