/* CSS 变量系统 - 支持深色模式 */
        :root {
            --bg-primary: #f8f9fa;
            --bg-secondary: #ffffff;
            --bg-tertiary: #f3f4f6;
            --text-primary: #1e1e1f;
            --text-secondary: #4b5563;
            --text-tertiary: #6b7280;
            --border-primary: #e5e7eb;
            --border-secondary: #d1d5db;
            --accent-primary: #3b82f6;
            --accent-secondary: #5ac8fa;
            --highlight-bg: #fef9c3;
            --highlight-text: #713f12;
            /* 建议 2：统一的阴影系统 */
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
        }

        [data-theme="dark"] {
            --bg-primary: #0f172a;
            --bg-secondary: #1e293b;
            --bg-tertiary: #334155;
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --text-tertiary: #94a3b8;
            --border-primary: #334155;
            --border-secondary: #475569;
            --accent-primary: #60a5fa;
            --accent-secondary: #3b82f6;
            --highlight-bg: #422006;
            --highlight-text: #fbbf24;
            /* 建议 2：统一的阴影系统 (Dark) */
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.15);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
        }

        /* 新增：为平滑滚动提供基础 */
        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .paper-card {
            background-color: var(--bg-secondary) !important;
            border-color: var(--border-primary) !important;
            color: var(--text-primary) !important;
            transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.3s ease;
        }

        .paper-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .loader {
            border-top-color: var(--accent-primary);
            animation: spin 1s linear infinite;
        }

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

        .keyword-tag {
            background-color: var(--bg-tertiary);
            color: var(--text-secondary);
            transition: background-color 0.2s ease, color 0.2s ease;
            cursor: pointer;
        }

        .keyword-tag:hover {
            background-color: var(--accent-primary);
            color: var(--bg-secondary);
        }

        /* 修改：标签悬停文字颜色 */
        .details-section h3 {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--accent-primary);
        }

        .details-section p {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .info-box {
            border-left-width: 4px;
            padding: 1rem;
            margin-top: 1rem;
            margin-bottom: 1rem;
            border-radius: 0 0.5rem 0.5rem 0;
            background-color: var(--bg-tertiary);
            border-color: var(--border-secondary);
        }

        .info-box-title {
            font-weight: 600;
            color: var(--text-primary);
        }

        .ai-details-section {
            max-height: 0;
            opacity: 0;
            overflow: hidden;
            transition: max-height 0.5s ease-in-out, opacity 0.3s ease-in-out, margin-top 0.5s ease-in-out, padding-top 0.5s ease-in-out, border-top-width 0.5s ease-in-out;
            border-top-width: 0;
            border-top-style: solid;
            border-color: var(--border-primary);
        }

        .ai-details-section.expanded {
            max-height: 2000px;
            opacity: 1;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top-width: 1px;
        }

        .quick-nav-container {
            background-color: var(--bg-secondary);
            -webkit-backdrop-filter: blur(8px);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-primary);
            opacity: 0.95;
        }

        /* 优化：改进快速导航栏布局 */
        .quick-nav .year-group {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            margin-bottom: 0.25rem;
        }

        .quick-nav .year-label {
            font-weight: 700;
            color: var(--text-primary);
            padding: 0.5rem 0.75rem;
            background-color: var(--bg-tertiary);
            border-radius: 0.375rem;
            margin-right: 0.75rem;
        }

        .quick-nav .month-btn {
            padding: 0.5rem 0.75rem;
            margin: 0.25rem;
            border-radius: 0.375rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background-color 0.2s, color 0.2s;
            cursor: pointer;
            border: 1px solid transparent;
        }

        .quick-nav .month-btn:hover {
            background-color: var(--bg-tertiary);
            color: var(--accent-primary);
            border-color: var(--border-secondary);
        }

        .quick-nav .month-btn.active {
            background-color: var(--accent-primary);
            color: white;
            font-weight: 600;
        }

        .highlight {
            background-color: var(--highlight-bg);
            color: var(--highlight-text);
            font-weight: bold;
            padding: 1px 2px;
            border-radius: 3px;
        }

        /* 新增：为高亮效果定义动画 */
        @keyframes pulse-glow {
            0% {
                box-shadow: 0 0 0 2px var(--accent-primary);
            }
            50% {
                box-shadow: 0 0 0 5px var(--accent-secondary), 0 0 15px var(--accent-secondary);
                opacity: 1; /* 动画中间态不透明 */
            }
            80% { /* 在动画结束前80%时开始淡出 */
                box-shadow: 0 0 0 2px var(--accent-primary);
                opacity: 1;
            }
            100% { /* 动画结束时完全透明 */
                box-shadow: 0 0 0 2px var(--accent-primary); /* 保留阴影 */
                opacity: 0; /* 动画结束时完全透明 */
            }
        }
        .highlight-shared-paper {
            animation: pulse-glow 1.5s ease-in-out 2 forwards; /* 使用 forwards 保持最终状态 */
            transition: box-shadow 0.3s ease-out, border-color 0.3s ease-out, opacity 0.3s ease-out;
        }

        /* 新增：深色模式切换按钮 */
        .theme-toggle {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-primary);
            color: var(--text-primary);
            padding: 0.5rem;
            border-radius: 0.5rem;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .theme-toggle:hover {
            /* 悬停效果微调 */
            background-color: var(--bg-secondary);
            border-color: var(--accent-primary);
        }

        /* 新增：搜索建议样式 */
        .search-suggestions {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-primary);
            border-top: none;
            border-radius: 0 0 0.5rem 0.5rem;
            box-shadow: 0 2px 10px rgba(0, 0, 0, .1);
            /* 调整：更轻微的阴影 */
            max-height: 300px;
            overflow-y: auto;
            z-index: 50;
            display: none;
        }

        .search-suggestions.visible {
            display: block;
        }

        .suggestion-item {
            padding: 0.75rem 1rem;
            cursor: pointer;
            border-bottom: 1px solid var(--border-primary);
            transition: background-color 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .suggestion-item:hover,
        .suggestion-item.highlighted {
            background-color: var(--bg-tertiary);
        }

        .suggestion-item:last-child {
            border-bottom: none;
        }

        .suggestion-type {
            font-size: 0.75rem;
            color: var(--text-tertiary);
            background-color: var(--bg-tertiary);
            padding: 0.25rem 0.5rem;
            border-radius: 0.25rem;
        }

        /* 新增：搜索历史 */
        .search-history {
            background-color: var(--bg-tertiary);
            padding: 0.5rem;
            margin-bottom: 0.5rem;
            border-radius: 0.375rem;
        }

        .search-history-title {
            font-size: 0.75rem;
            color: var(--text-tertiary);
            margin-bottom: 0.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .search-history-item {
            display: inline-block;
            background-color: var(--bg-secondary);
            color: var(--text-secondary);
            padding: 0.25rem 0.5rem;
            margin: 0.125rem;
            border-radius: 0.25rem;
            font-size: 0.875rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .search-history-item:hover {
            background-color: var(--accent-primary);
            color: white;
        }

        /* 新增：论文标签系统 */
        .paper-tags {
            margin-top: 0.5rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.25rem;
        }

        .custom-tag {
            background-color: var(--accent-secondary);
            color: white;
            padding: 0.25rem 0.5rem;
            border-radius: 0.25rem;
            font-size: 0.75rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .tag-remove {
            cursor: pointer;
            opacity: 0.7;
            transition: opacity 0.2s ease;
        }

        .tag-remove:hover {
            opacity: 1;
        }

        /* 新增：论文笔记 */
        .paper-notes {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-primary);
            border-radius: 0.375rem;
            padding: 0.75rem;
            margin-top: 0.5rem;
            display: none;
        }

        .paper-notes.visible {
            display: block;
        }

        .notes-textarea {
            width: 100%;
            min-height: 80px;
            padding: 0.5rem;
            border: 1px solid var(--border-primary);
            border-radius: 0.25rem;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            resize: vertical;
            font-family: inherit;
        }

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

        /* 新增：评分系统 */
        .paper-rating {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            margin-top: 0.5rem;
        }

        .star-rating {
            display: flex;
            gap: 0.125rem;
        }

        .star {
            cursor: pointer;
            color: var(--text-tertiary);
            transition: color 0.2s ease;
            font-size: 1.25rem;
        }

        .star:hover,
        .star.active {
            color: #fbbf24;
        }

        /* 新增：阅读进度指示器 */
        .reading-progress {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--bg-tertiary);
            z-index: 100;
        }

        .reading-progress-bar {
            height: 100%;
            background-color: var(--accent-primary);
            width: 0%;
            transition: width 0.1s ease;
        }

        .back-to-top-btn {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background-color: var(--accent-primary);
            color: white;
            width: 3rem;
            height: 3rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transform: translateY(100px);
            transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s ease;
            z-index: 50;
            box-shadow: 0 4px 6px var(--shadow-light);
            border: none;
            outline: none;
        }

        .back-to-top-btn.visible {
            opacity: 0.8;
            transform: translateY(0);
        }

        .back-to-top-btn:hover {
            opacity: 1;
            background-color: var(--accent-secondary);
        }

        .back-to-top-btn:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        .skeleton-card {
            background-color: var(--bg-secondary);
            padding: 1.5rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px var(--shadow-light), 0 2px 4px -2px var(--shadow-dark);
            border: 1px solid var(--border-primary);
        }

        .skeleton {
            background-color: var(--border-primary);
            border-radius: 0.25rem;
        }

        .skeleton.h-4 {
            height: 1rem;
        }

        .skeleton.w-1\/4 {
            width: 25%;
        }

        .skeleton.w-1\/2 {
            width: 50%;
        }

        .skeleton.w-3\/4 {
            width: 75%;
        }

        .skeleton.w-full {
            width: 100%;
        }

        @keyframes pulse {
            50% {
                opacity: .5;
            }
        }

        .skeleton-animate {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }

        .favorite-btn {
            color: var(--text-tertiary);
            transition: color 0.2s, transform 0.2s;
            border: none;
            background: none;
            cursor: pointer;
            padding: 0.25rem;
            border-radius: 0.25rem;
        }

        .favorite-btn:hover {
            color: #facc15;
            transform: scale(1.1);
        }

        .favorite-btn.favorited {
            color: #f59e0b;
        }

        .favorite-btn:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        /* --- 最终UI/UX打磨 --- */
        header {
            padding-bottom: 1rem;
        }

        .view-toggle {
            display: flex;
            align-items: center;
            background-color: var(--bg-tertiary);
            border-radius: 9999px;
            padding: 2px;
            cursor: pointer;
        }

        .view-toggle button {
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all 0.2s ease;
            border: none;
            background-color: transparent;
            cursor: pointer;
        }

        .view-toggle button.active {
            background-color: var(--bg-secondary);
            color: var(--accent-primary);
            box-shadow: 0 1px 3px var(--shadow-light);
        }

        .view-toggle button:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        .compact-view .compact-hidden {
            display: none;
        }

        .compact-view .paper-card {
            padding: 1rem;
        }

        .compact-view .paper-card h2 {
            font-size: 1.125rem;
        }

        .compact-view .paper-card h3 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }

        /* 新增：分享按钮样式 */
        .share-btn {
            color: var(--text-tertiary);
            transition: color 0.2s, transform 0.2s;
            border: none;
            background: none;
            cursor: pointer;
            padding: 0.25rem;
            border-radius: 0.25rem;
        }

        .share-btn:hover {
            color: var(--accent-primary);
            transform: scale(1.1);
        }

        .share-btn:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        /* 新增：Toast通知样式 */
        .toast {
            position: fixed;
            top: -100px;
            left: 50%;
            transform: translateX(-50%);
            background-color: #22c55e;
            color: white;
            padding: 1rem 2rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 15px var(--shadow-dark);
            transition: top 0.5s ease-in-out;
            z-index: 100;
        }

        .toast.show {
            top: 2rem;
        }

        .toast.error {
            background-color: #ef4444;
        }

        .toast.warning {
            background-color: #f59e0b;
        }

        /* 新增：分类筛选器样式 */
        .category-filter-btn {
            padding: 0.25rem 0.75rem; /* 减小内边距 */
            border: 1px solid var(--border-secondary);
            border-radius: 9999px;
            font-size: 0.75rem; /* 减小字体 */
            font-weight: 500;
            line-height: 1.5; /* 增加行高以确保垂直居中 */
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.2s ease;
            background-color: var(--bg-secondary);
        }

        .category-filter-btn:hover {
            background-color: var(--bg-tertiary);
            border-color: var(--text-tertiary);
        }

        .category-filter-btn.active {
            background-color: var(--accent-primary);
            color: white;
            border-color: var(--accent-primary);
        }

        .category-filter-btn:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        /* 新增：分类筛选器滚动条样式 */
        #category-filters::-webkit-scrollbar {
            height: 4px;
        }

        #category-filters::-webkit-scrollbar-track {
            background: var(--bg-tertiary);
            border-radius: 2px;
        }

        #category-filters::-webkit-scrollbar-thumb {
            background: var(--accent-primary);
            border-radius: 2px;
        }

        /* 新增：日期筛选器样式 */
        .month-header {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text-primary);
            padding: 2rem 0 1rem 0;
            border-top: 1px solid var(--border-secondary);
            margin-top: 2rem;
        }

        .date-filter-btn {
            padding: 0.25rem 0.625rem; /* 减小内边距 */
            border: 1px solid var(--border-secondary);
            border-radius: 0.375rem;
            font-size: 0.75rem; /* 减小字体 */
            font-weight: 500;
            color: var(--text-secondary);
            cursor: pointer;
            background-color: var(--bg-secondary);
            /* 优化：合并样式，使用flex进行精准对齐，并优化过渡效果 */
            display: inline-flex;
            align-items: baseline;
            transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
        }

        .date-filter-btn:hover {
            background-color: var(--bg-tertiary);
            border-color: var(--text-tertiary);
        }

        .date-filter-btn.active {
            background-color: var(--accent-primary);
            color: white;
            border-color: var(--accent-primary);
        }

        .date-filter-btn:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        .date-filter-btn .filter-count {
            font-size: 0.625rem; /* 10px, 更小的字号 */
            font-weight: 600;
            color: var(--text-secondary); /* 增强对比度，提升可读性 */
            background-color: var(--bg-tertiary);
            padding: 0.125rem 0.375rem;
            border-radius: 0.25rem;
            margin-left: 0.25rem;
            line-height: 1; /* 确保徽章本身行高紧凑 */
            transition: background-color 0.2s ease, color 0.2s ease; /* 更精确的过渡效果 */
        }

        /* 新增：当鼠标悬停在未激活的按钮上时，徽章也做出响应，增强整体感 */
        .date-filter-btn:not(.active):hover .filter-count {
            background-color: var(--border-secondary);
            color: var(--text-primary);
        }

        .date-filter-btn.active .filter-count {
            background-color: rgba(0, 0, 0, 0.2); /* 在激活状态下提供更佳的视觉对比 */
            color: white;
        }

        /* 🆕 Apple风格紧凑分类筛选器 */
        .category-filter-section {
            margin-top: 0.75rem;
            padding: 0.75rem;
            background-color: var(--bg-secondary);
            border-radius: 8px;
            border: 1px solid var(--border-primary);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 100%;
            overflow: hidden;
        }

        .category-filter-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.5rem;
            padding-bottom: 0.25rem;
        }

        .category-filter-title {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-right: 0.5rem;
        }

        .category-total-count {
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-secondary);
            background-color: var(--bg-tertiary);
            padding: 0.125rem 0.375rem;
            border-radius: 4px;
            border: 1px solid var(--border-secondary);
        }

        .category-clear-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.25rem 0.5rem;
            font-size: 0.7rem;
            font-weight: 500;
            color: #ff3b30;
            background-color: rgba(255, 59, 48, 0.1);
            border: 1px solid rgba(255, 59, 48, 0.2);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .category-clear-btn:hover {
            background-color: rgba(255, 59, 48, 0.15);
            border-color: rgba(255, 59, 48, 0.3);
            transform: scale(1.02);
        }

        .category-filter-scroll-wrapper {
            position: relative;
            width: 100%;
            max-width: 100%;
            overflow: hidden;
        }

        .category-filter-buttons {
            display: flex;
            gap: 0.375rem;
            overflow-x: auto;
            overflow-y: hidden;
            padding: 0.25rem 0;
            scroll-behavior: smooth;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            max-width: 100%;
            width: 100%;
        }

        .category-filter-buttons::-webkit-scrollbar {
            display: none;
        }

        /* Apple风格紧凑按钮 */
        .category-filter-btn {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.25rem 0.5rem;
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-secondary);
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-secondary);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
            min-height: 24px;
            max-height: 24px;
            width: auto;
            min-width: fit-content;
        }

        .category-filter-btn:hover {
            background-color: #f0f0f0;
            border-color: #d0d0d0;
            transform: scale(1.02);
        }

        [data-theme="dark"] .category-filter-btn:hover {
            background-color: #3a3a3c;
            border-color: #4a4a4c;
        }

        .category-filter-btn-active {
            background-color: #007aff;
            color: white;
            border-color: #007aff;
            font-weight: 600;
        }

        .category-filter-btn-active:hover {
            background-color: #0056cc;
            border-color: #0056cc;
        }

        .category-name {
            font-weight: inherit;
            letter-spacing: 0;
        }

        .category-count {
            font-size: 0.65rem;
            font-weight: 600;
            background-color: rgba(255, 255, 255, 0.9);
            color: #666;
            padding: 0.1rem 0.25rem;
            border-radius: 3px;
            line-height: 1;
            min-width: 14px;
            text-align: center;
            border: none;
        }

        .category-filter-btn-active .category-count {
            background-color: rgba(255, 255, 255, 0.25);
            color: white;
        }

        .category-scroll-indicator {
            position: absolute;
            right: 0;
            top: 0;
            bottom: 0;
            width: 30px;
            background: linear-gradient(to left, var(--bg-secondary) 70%, transparent 100%);
            pointer-events: none;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 10;
        }

        .category-scroll-indicator.visible {
            opacity: 0.8;
        }

        .scroll-hint {
            color: var(--text-tertiary);
            font-size: 14px;
            font-weight: bold;
            text-shadow: 0 1px 2px rgba(0,0,0,0.1);
            animation: pulse-horizontal 2s infinite;
        }

        @keyframes pulse-horizontal {
            0%, 100% { 
                opacity: 0.6; 
                transform: translateX(0);
            }
            50% { 
                opacity: 1; 
                transform: translateX(2px);
            }
        }

        /* 增加左侧渐变提示（当已经滚动时） */
        .category-filter-scroll-wrapper::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 20px;
            background: linear-gradient(to right, var(--bg-secondary) 70%, transparent 100%);
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 10;
        }

        .category-filter-scroll-wrapper.scrolled::before {
            opacity: 0.8;
        }

        /* 响应式设计 - 更紧凑 */
        @media (max-width: 768px) {
            .category-filter-section {
                margin-top: 0.5rem;
                padding: 0.5rem;
                border-radius: 6px;
            }

            .category-filter-header {
                margin-bottom: 0.375rem;
            }

            .category-filter-btn {
                padding: 0.2rem 0.4rem;
                font-size: 0.65rem;
                gap: 0.2rem;
                min-height: 20px;
                max-height: 20px;
            }

            .category-count {
                font-size: 0.6rem;
                padding: 0.05rem 0.2rem;
                min-width: 12px;
            }

            .category-total-count {
                font-size: 0.65rem;
                padding: 0.1rem 0.3rem;
            }
        }

        /* 优化：顶部加载进度条样式 */
        #progress-container {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: auto;
            z-index: 101;
            opacity: 0;
            transform: translateY(-100%);
            transition: opacity 0.3s, transform 0.3s;
        }

        #progress-container.visible {
            opacity: 1;
            transform: translateY(0);
        }

        #top-loader {
            width: 100%;
            height: 4px;
            background-color: var(--bg-tertiary);
        }

        #top-loader-bar {
            width: 0%;
            height: 100%;
            background-color: var(--accent-primary);
            transition: width 0.3s ease;
        }

        #progress-text {
            background-color: rgba(0, 0, 0, 0.6);
            color: white;
            font-size: 0.875rem;
            padding: 0.25rem 0.75rem;
            border-radius: 0 0 0.375rem 0;
        }

        /* 新增：信息框颜色类 */
        .info-box-yellow {
            background-color: #fefce8;
            border-color: #facc15;
        }

        .info-box-yellow .info-box-title {
            color: #a16207;
        }

        .info-box-yellow p {
            color: #a16207;
        }

        .info-box-green {
            background-color: #f0fdf4;
            border-color: #22c55e;
        }

        .info-box-green .info-box-title {
            color: #15803d;
        }

        .info-box-green p {
            color: #15803d;
        }

        .info-box-indigo {
            background-color: #eef2ff;
            border-color: #6366f1;
        }

        .info-box-indigo .info-box-title {
            color: #4338ca;
        }

        .info-box-indigo p {
            color: #4338ca;
        }

        [data-theme="dark"] .info-box-yellow {
            background-color: #422006;
            border-color: #ca8a04;
        }

        [data-theme="dark"] .info-box-yellow .info-box-title {
            color: #fbbf24;
        }

        [data-theme="dark"] .info-box-yellow p {
            color: #fde047;
        }

        [data-theme="dark"] .info-box-green {
            background-color: #052e16;
            border-color: #059669;
        }

        [data-theme="dark"] .info-box-green .info-box-title {
            color: #34d399;
        }

        [data-theme="dark"] .info-box-green p {
            color: #6ee7b7;
        }

        [data-theme="dark"] .info-box-indigo {
            background-color: #1e1b4b;
            border-color: #8b5cf6;
        }

        [data-theme="dark"] .info-box-indigo .info-box-title {
            color: #a78bfa;
        }

        [data-theme="dark"] .info-box-indigo p {
            color: #c4b5fd;
        }

        /* 新增：键盘导航高亮 */
        .focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        /* 新增：搜索栏容器修复内联样式问题 */
        .search-bar-container {
            position: sticky;
            z-index: 10;
            margin-bottom: 2rem;
            top: var(--nav-height, 8px);
        }

        /* 修复：更新卡片颜色 */
        .paper-card {
            background-color: var(--bg-secondary) !important;
            border-color: var(--border-primary) !important;
            color: var(--text-primary) !important;
        }

        /* 修复：搜索输入框样式 */
        #searchInput {
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            border-color: var(--border-primary);
        }

        #searchInput:focus {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        /* ===== 用户引导和教程样式 ===== */

        /* 教程覆盖层 */
        .tutorial-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 1000;
            display: none;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .tutorial-overlay.active {
            display: flex;
            opacity: 1;
        }

        /* 教程高亮区域 */
        .tutorial-highlight {
            position: absolute;
            background-color: transparent;
            border: 3px solid var(--accent-primary);
            border-radius: 8px;
            box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.7);
            z-index: 1001;
            pointer-events: none;
            transition: all 0.3s ease;
            animation: pulse-highlight 2s infinite;
        }

        @keyframes pulse-highlight {

            0%,
            100% {
                border-color: var(--accent-primary);
                box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.7), 0 0 20px var(--accent-primary);
            }

            50% {
                border-color: var(--accent-secondary);
                box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.7), 0 0 30px var(--accent-secondary);
            }
        }

        /* 教程信息卡片 */
        .tutorial-card {
            position: fixed;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
            max-width: 400px;
            width: 90%;
            z-index: 1002;
            transform: scale(0.9);
            opacity: 0;
            transition: all 0.3s ease;
            border: 1px solid var(--border-primary);
        }

        .tutorial-card.active {
            transform: scale(1);
            opacity: 1;
        }

        .tutorial-card h3 {
            color: var(--accent-primary);
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .tutorial-card p {
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 1.5rem;
        }

        .tutorial-card .feature-list {
            list-style: none;
            padding: 0;
            margin: 1rem 0;
        }

        .tutorial-card .feature-list li {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 0;
            color: var(--text-secondary);
        }

        .tutorial-card .feature-list .check-icon {
            color: #22c55e;
            font-weight: bold;
        }

        /* 教程按钮 */
        .tutorial-buttons {
            display: flex;
            gap: 0.75rem;
            justify-content: flex-end;
            margin-top: 1.5rem;
        }

        .tutorial-btn {
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            border: none;
            font-size: 0.875rem;
        }

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

        .tutorial-btn-primary:hover {
            background-color: var(--accent-secondary);
            transform: translateY(-1px);
        }

        .tutorial-btn-secondary {
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
            border: 1px solid var(--border-primary);
        }

        .tutorial-btn-secondary:hover {
            background-color: var(--bg-primary);
        }

        .tutorial-btn-skip {
            background-color: transparent;
            color: var(--text-tertiary);
            border: none;
            text-decoration: underline;
        }

        .tutorial-btn-skip:hover {
            color: var(--text-secondary);
        }

        /* 教程进度指示器 */
        .tutorial-progress {
            position: fixed;
            top: 2rem;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--bg-secondary);
            padding: 1rem 2rem;
            border-radius: 2rem;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            z-index: 1003;
            border: 1px solid var(--border-primary);
            display: none;
        }

        .tutorial-progress.active {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .tutorial-progress-bar {
            width: 150px;
            height: 6px;
            background-color: var(--bg-tertiary);
            border-radius: 3px;
            overflow: hidden;
        }

        .tutorial-progress-fill {
            height: 100%;
            background-color: var(--accent-primary);
            transition: width 0.3s ease;
            border-radius: 3px;
        }

        .tutorial-progress-text {
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* 功能提示气泡 */
        .feature-tooltip {
            position: absolute;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            padding: 0.75rem 1rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            font-size: 0.875rem;
            z-index: 100;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s ease;
            border: 1px solid var(--border-primary);
            max-width: 250px;
            white-space: pre-wrap;
        }

        .feature-tooltip.show {
            opacity: 1;
            transform: translateY(-5px);
        }

        .feature-tooltip::after {
            content: '';
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            border: 6px solid transparent;
            border-top-color: var(--bg-secondary);
        }

        .feature-tooltip.tooltip-bottom::after {
            top: -12px;
            border-top-color: transparent;
            border-bottom-color: var(--bg-secondary);
        }

        /* 热门关键词展示 */
        .popular-keywords {
            background-color: var(--bg-tertiary);
            border-radius: 0.75rem;
            padding: 1rem;
            margin-bottom: 1rem;
            border: 1px solid var(--border-primary);
        }

        .popular-keywords h4 {
            color: var(--text-primary);
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .popular-keywords-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .popular-keyword {
            background-color: var(--bg-secondary);
            color: var(--text-secondary);
            padding: 0.375rem 0.75rem;
            border-radius: 1rem;
            font-size: 0.75rem;
            cursor: pointer;
            transition: all 0.2s ease;
            border: 1px solid var(--border-primary);
        }

        .popular-keyword:hover {
            background-color: var(--accent-primary);
            color: white;
            border-color: var(--accent-primary);
            transform: translateY(-1px);
        }

        /* 功能介绍卡片 */
        .welcome-card {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: white;
            padding: 2rem;
            border-radius: 1rem;
            margin-bottom: 2rem;
            position: relative;
            overflow: hidden;
        }

        .welcome-card::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100%;
            height: 100%;
            background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath d='M20 20h60v60H20z' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='1'/%3E%3C/svg%3E") repeat;
            animation: float 20s linear infinite;
        }

        @keyframes float {
            0% {
                transform: translateX(0) translateY(0);
            }

            100% {
                transform: translateX(-50px) translateY(-50px);
            }
        }

        .welcome-card h2 {
            font-size: 1.75rem;
            font-weight: 800;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }

        .welcome-card p {
            font-size: 1rem;
            opacity: 0.9;
            line-height: 1.6;
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 1;
        }

        .welcome-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .welcome-btn {
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            border: none;
            font-size: 0.875rem;
        }

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

        .welcome-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        .welcome-btn-secondary {
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .welcome-btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.3);
        }

        /* 快速功能访问面板 */
        .quick-actions {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .quick-action-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-primary);
            border-radius: 0.75rem;
            padding: 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }

        .quick-action-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            border-color: var(--accent-primary);
        }

        .quick-action-icon {
            width: 3rem;
            height: 3rem;
            margin: 0 auto 1rem;
            background-color: var(--accent-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
        }

        .quick-action-title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }

        .quick-action-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        /* 首次访问检测和状态 */
        .first-visit-indicator {
            position: fixed;
            top: -100px;
            left: 50%;
            transform: translateX(-50%);
            background-color: #10b981;
            color: white;
            padding: 1rem 2rem;
            border-radius: 0.5rem;
            font-weight: 600;
            z-index: 200;
            transition: top 0.5s ease;
            box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
        }

        .first-visit-indicator.show {
            top: 2rem;
        }

        /* 移动端教程优化 */
        @media (max-width: 768px) {
            .tutorial-card {
                width: 95%;
                padding: 1.5rem;
                border-radius: 0.75rem;
                max-width: none;
                position: fixed !important;
                top: 50% !important;
                left: 50% !important;
                transform: translate(-50%, -50%) !important;
            }

            .tutorial-card h3 {
                font-size: 1.125rem;
            }

            .tutorial-buttons {
                flex-direction: column;
                gap: 0.5rem;
            }

            .tutorial-btn {
                width: 100%;
                justify-content: center;
                display: flex;
                min-height: 44px;
            }

            .tutorial-progress {
                top: 1rem;
                width: 90%;
                padding: 0.75rem 1rem;
            }

            .tutorial-progress-bar {
                width: 100px;
            }

            .tutorial-highlight {
                border-width: 2px;
                animation: none;
                /* 在移动端禁用动画以提高性能 */
            }

            .welcome-card {
                padding: 1.5rem;
                text-align: center;
            }

            .welcome-card h2 {
                font-size: 1.5rem;
            }

            .welcome-actions {
                justify-content: center;
                flex-direction: column;
                gap: 0.75rem;
            }

            .welcome-btn {
                width: 100%;
                min-height: 44px;
                justify-content: center;
                display: flex;
                align-items: center;
            }

            .quick-actions {
                grid-template-columns: 1fr;
                gap: 0.75rem;
            }

            .quick-action-card {
                padding: 1rem;
            }

            .quick-action-card:active {
                transform: scale(0.98);
            }

            .feature-tooltip {
                max-width: 200px;
                font-size: 0.75rem;
                position: fixed !important;
                top: auto !important;
                bottom: 6rem !important;
                left: 1rem !important;
                right: 1rem !important;
                transform: none !important;
                text-align: center;
            }

            .feature-tooltip::after {
                display: none;
                /* 隐藏箭头 */
            }

            .popular-keywords {
                margin-bottom: 0.75rem;
            }

            .popular-keyword {
                min-height: 36px;
                padding: 0.5rem 0.75rem;
                font-size: 0.875rem;
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }
        }

        /* 无障碍和可访问性优化 */
        .tutorial-overlay:focus-within {
            outline: none;
        }

        .tutorial-btn:focus,
        .welcome-btn:focus,
        .quick-action-card:focus {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }

        /* 减少动画的用户偏好 */
        @media (prefers-reduced-motion: reduce) {

            .tutorial-highlight,
            .tutorial-card,
            .feature-tooltip,
            .welcome-card::before {
                animation: none;
                transition: none;
            }
        }

        /* 深色模式下的教程样式优化 */
        [data-theme="dark"] .tutorial-overlay {
            background-color: rgba(0, 0, 0, 0.8);
        }

        [data-theme="dark"] .tutorial-highlight {
            border-color: var(--accent-secondary);
            box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.8), 0 0 30px var(--accent-secondary);
        }

        [data-theme="dark"] .welcome-card {
            background: linear-gradient(135deg, #1e40af, #3b82f6);
        }

        [data-theme="dark"] .first-visit-indicator {
            background-color: #059669;
            box-shadow: 0 4px 15px rgba(5, 150, 105, 0.4);
        }

        /* 修复：按钮样式 */
        .paper-card button {
            background-color: transparent;
            border: none;
        }

        .paper-card a {
            color: inherit;
        }

        [data-theme="dark"] .paper-card a:hover {
            color: var(--accent-primary);
        }

        /* 新增：AI分析按钮样式 */
        .ai-toggle-btn {
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
            border: 1px solid var(--border-primary);
            transition: all 0.2s ease;
        }

        .ai-toggle-btn:hover {
            background-color: var(--accent-primary);
            color: white;
            border-color: var(--accent-primary);
        }

        /* 新增：论文标题样式 */
        .paper-title {
            color: var(--text-primary) !important;
        }

        .paper-title-zh {
            color: var(--accent-primary) !important;
        }

        /* 新增：AI分析标题样式 */
        .ai-analysis-title {
            color: var(--text-primary) !important;
        }

        /* 新增：论文链接样式 */
        .paper-link-abstract {
            color: #3b82f6;
            transition: color 0.2s ease;
        }

        .paper-link-abstract:hover {
            color: #1d4ed8;
        }

        .paper-link-pdf {
            color: #ef4444;
            transition: color 0.2s ease;
        }

        .paper-link-pdf:hover {
            color: #dc2626;
        }

        [data-theme="dark"] .paper-link-abstract {
            color: #60a5fa;
        }

        [data-theme="dark"] .paper-link-abstract:hover {
            color: #93c5fd;
        }

        [data-theme="dark"] .paper-link-pdf {
            color: #f87171;
        }

        [data-theme="dark"] .paper-link-pdf:hover {
            color: #fca5a5;
        }

        .paper-link-alphaxiv {
            color: #4f46e5;
            transition: color 0.2s ease;
        }

        .paper-link-alphaxiv:hover {
            color: #3730a3;
        }

        [data-theme="dark"] .paper-link-alphaxiv {
            color: #818cf8;
        }

        [data-theme="dark"] .paper-link-alphaxiv:hover {
            color: #a78bfa;
        }

        /* ===== 移动端优化样式 ===== */

        /* 基础响应式设置 */
        @media (max-width: 768px) {

            /* 容器和间距优化 */
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }

            /* 标题优化 */
            header h1 {
                font-size: 1.75rem;
                line-height: 1.2;
            }

            /* 快速导航栏移动端优化 */
            .quick-nav {
                flex-direction: column;
                gap: 0.75rem;
                align-items: stretch;
            }

            .quick-nav .year-group {
                flex-direction: column;
                align-items: stretch;
                gap: 0.5rem;
                margin-bottom: 0.5rem;
            }

            .quick-nav .year-label {
                text-align: center;
                font-size: 0.875rem;
                padding: 0.375rem 0.5rem;
            }

            .quick-nav .month-btn {
                min-height: 44px;
                /* 触摸目标最小尺寸 */
                padding: 0.75rem;
                font-size: 0.875rem;
                text-align: center;
                margin: 0.125rem;
                border: 2px solid transparent;
                position: relative;
                overflow: hidden;
            }

            /* 触摸反馈涟漪效果 */
            .month-btn::before {
                content: '';
                position: absolute;
                top: 50%;
                left: 50%;
                width: 0;
                height: 0;
                background: rgba(59, 130, 246, 0.3);
                border-radius: 50%;
                transform: translate(-50%, -50%);
                transition: width 0.3s, height 0.3s;
                pointer-events: none;
            }

            .month-btn:active::before {
                width: 300px;
                height: 300px;
            }

            /* 工具栏移动端优化 */
            .quick-nav .flex.items-center {
                flex-direction: column;
                gap: 0.5rem;
                width: 100%;
            }

            .view-toggle {
                width: 100%;
                justify-content: center;
            }

            .view-toggle button {
                flex: 1;
                min-height: 44px;
                padding: 0.75rem 1rem;
            }

            #show-favorites-btn {
                width: 100%;
                min-height: 44px;
                justify-content: center;
                padding: 0.75rem 1rem;
            }
        }

        /* 移动端导航栏汉堡菜单 */
        @media (max-width: 640px) {
            .mobile-nav-toggle {
                display: block;
                background: none;
                border: none;
                font-size: 1.5rem;
                padding: 0.5rem;
                cursor: pointer;
                color: var(--text-primary);
                min-height: 44px;
                min-width: 44px;
            }

            .mobile-nav-content {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--bg-secondary);
                border: 1px solid var(--border-primary);
                border-radius: 0.5rem;
                margin-top: 0.5rem;
                padding: 1rem;
                box-shadow: 0 10px 25px var(--shadow-dark);
                z-index: 50;
            }

            .mobile-nav-content.active {
                display: block;
            }

            .quick-nav-container {
                position: relative;
            }

            /* 隐藏桌面端导航 */
            .hidden.md\\:flex {
                display: none !important;
            }
        }

        /* 桌面端隐藏移动端元素 */
        @media (min-width: 769px) {
            .mobile-nav-toggle {
                display: none;
            }

            .mobile-nav-content {
                display: none !important;
            }

            .md\\:hidden {
                display: none !important;
            }
        }

        /* 搜索框移动端优化 */
        @media (max-width: 768px) {
            #searchInput {
                font-size: 1rem;
                /* 防止iOS缩放 */
                padding: 1rem;
                min-height: 44px;
            }

            .search-suggestions {
                max-height: 200px;
                border-radius: 0.5rem;
            }

            .suggestion-item {
                padding: 1rem;
                min-height: 44px;
                display: flex;
                align-items: center;
            }

            .search-history-panel {
                border-radius: 0.5rem;
                margin-bottom: 1rem;
            }

            .search-history-item {
                min-height: 36px;
                padding: 0.5rem 0.75rem;
                margin: 0.25rem;
                display: inline-flex;
                align-items: center;
            }
        }

        /* 论文卡片移动端优化 */
        @media (max-width: 768px) {
            .paper-card {
                padding: 1rem;
                margin-bottom: 1rem;
                border-radius: 0.75rem;
            }

            .paper-card h2 {
                font-size: 1.125rem;
                line-height: 1.4;
                margin-bottom: 0.75rem;
            }

            .paper-card h3 {
                font-size: 1rem;
                margin-bottom: 0.5rem;
            }

            .paper-card .flex.justify-between {
                flex-direction: column;
                align-items: stretch;
                gap: 0.75rem;
            }

            .paper-card .flex.items-center.space-x-2 {
                justify-content: space-between;
                margin-top: 0.5rem;
            }

            .paper-card button,
            .paper-card a {
                min-height: 44px;
                min-width: 44px;
                display: inline-flex;
                align-items: center;
                justify-content: center;
                padding: 0.75rem;
                border-radius: 0.5rem;
                transition: all 0.2s ease;
            }

            /* 分类和关键词标签优化 */
            .keyword-tag {
                font-size: 0.75rem;
                padding: 0.5rem 0.75rem;
                margin: 0.125rem;
                min-height: 32px;
                display: inline-flex;
                align-items: center;
            }

            /* AI分析按钮优化 */
            .ai-toggle-btn {
                width: 100%;
                min-height: 44px;
                margin-top: 0.75rem;
            }

            /* 论文链接优化 */
            .paper-card .flex.items-center.space-x-4 {
                flex-direction: column;
                gap: 0.75rem;
                align-items: stretch;
            }

            .paper-card .flex.items-center.space-x-4 a {
                text-align: center;
                padding: 0.75rem 1rem;
                border: 1px solid var(--border-primary);
                border-radius: 0.5rem;
                font-weight: 600;
                transition: all 0.2s ease;
            }

            .paper-link-abstract {
                background-color: rgba(59, 130, 246, 0.1);
            }

            .paper-link-pdf {
                background-color: rgba(239, 68, 68, 0.1);
            }

            .paper-link-alphaxiv {
                background-color: rgba(79, 70, 229, 0.1);
            }
        }

        /* 新增：移动端卡片滑动操作 */
        @media (max-width: 768px) {
            .paper-card {
                position: relative;
                overflow: hidden; /* 隐藏初始状态下的操作按钮 */
                -webkit-user-select: none; /* 防止滑动时选中文本 */
                user-select: none;
            }

            .paper-card-content {
                position: relative;
                z-index: 2;
                background-color: var(--bg-secondary);
                transition: transform 0.3s ease;
                touch-action: pan-y; /* 允许垂直滚动，JS处理水平滑动 */
            }

            .swipe-action {
                position: absolute;
                top: 0;
                bottom: 0;
                width: 100px; /* 操作区域宽度 */
                display: flex;
                align-items: center;
                justify-content: center;
                z-index: 1;
                color: white;
                opacity: 0;
                transition: opacity 0.3s ease;
            }

            .swipe-action-right { /* 右滑时出现（在左侧） */
                left: 0;
                background: linear-gradient(to right, #f59e0b, #facc15); /* 收藏的颜色 */
            }

            .swipe-action-left { /* 左滑时出现（在右侧） */
                right: 0;
                background: linear-gradient(to left, #6b7280, #9ca3af); /* 隐藏的颜色 */
            }

            .swipe-action svg {
                width: 2rem;
                height: 2rem;
                transform: scale(0.8);
                transition: transform 0.2s ease;
            }

            .paper-card.is-swiping .paper-card-content {
                transition: none; /* 滑动时禁用过渡，确保实时响应 */
            }

            .paper-card.is-hidden {
                transition: transform 0.4s ease, opacity 0.4s ease, max-height 0.5s ease 0.1s, margin-bottom 0.5s ease 0.1s, padding 0.5s ease 0.1s;
                transform: translateX(-120%);
                opacity: 0;
                max-height: 0;
                padding-top: 0;
                padding-bottom: 0;
                margin-bottom: 0 !important; /* 确保移除间距 */
                border: none;
            }
        }

        /* 收藏按钮移动端优化 */
        @media (max-width: 768px) {
            .favorite-btn {
                min-height: 44px;
                min-width: 44px;
                padding: 0.75rem;
                border-radius: 0.5rem;
                background-color: var(--bg-tertiary);
                transition: all 0.2s ease;
            }

            .favorite-btn:active {
                transform: scale(0.95);
                background-color: var(--accent-primary);
                color: white;
            }
        }

        /* 分类筛选器移动端优化 */
        @media (max-width: 768px) {
            .category-filter-btn {
                min-height: 44px;
                padding: 0.75rem 1rem;
                font-size: 0.875rem;
                margin: 0.25rem;
                flex-shrink: 0;
            }
        }

        /* 日期筛选器移动端优化 */
        @media (max-width: 768px) {
            .date-filter-btn {
                min-height: 40px;
                padding: 0.5rem 0.75rem;
                font-size: 0.875rem;
                margin: 0.125rem;
            }

            .flex.flex-wrap.items-center.gap-2 {
                overflow-x: auto;
                flex-wrap: nowrap;
                padding-bottom: 0.5rem;
            }
        }

        /* 返回顶部按钮移动端优化 */
        @media (max-width: 768px) {
            .back-to-top-btn {
                bottom: 1rem;
                right: 1rem;
                width: 3.5rem;
                height: 3.5rem;
                box-shadow: 0 8px 25px var(--shadow-dark);
            }
        }

        /* Toast通知移动端优化 */
        @media (max-width: 768px) {
            .toast {
                left: 1rem;
                right: 1rem;
                transform: none;
                border-radius: 0.75rem;
                padding: 1rem;
                font-size: 0.875rem;
            }

            .toast.show {
                top: 1rem;
            }
        }

        /* 底部导航栏（移动端专用） */
        @media (max-width: 768px) {
            .mobile-bottom-nav {
                position: fixed;
                bottom: 0;
                left: 0;
                right: 0;
                background-color: var(--bg-secondary);
                border-top: 1px solid var(--border-primary);
                padding: 0.75rem 1rem;
                display: flex;
                justify-content: space-around;
                align-items: center;
                z-index: 40;
                box-shadow: 0 -4px 10px var(--shadow-light);
            }

            .mobile-bottom-nav button {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 0.25rem;
                background: none;
                border: none;
                color: var(--text-secondary);
                font-size: 0.75rem;
                font-weight: 500;
                padding: 0.5rem;
                border-radius: 0.5rem;
                transition: all 0.2s ease;
                min-height: 44px;
                min-width: 44px;
            }

            .mobile-bottom-nav button.active {
                color: var(--accent-primary);
                background-color: rgba(59, 130, 246, 0.1);
            }

            .mobile-bottom-nav svg {
                width: 1.25rem;
                height: 1.25rem;
            }

            .mobile-badge {
                position: absolute;
                top: -0.25rem;
                right: -0.25rem;
                background-color: #ef4444;
                color: white;
                font-size: 0.75rem;
                border-radius: 50%;
                height: 1.25rem;
                width: 1.25rem;
                display: flex;
                align-items: center;
                justify-content: center;
                font-weight: bold;
            }

            /* 为底部导航栏添加空间 */
            body {
                padding-bottom: 5rem;
            }
        }

        /* 手势操作支持 */
        @media (max-width: 768px) {
            .swipe-container {
                touch-action: pan-x;
                position: relative;
                overflow: hidden;
            }

            .swipe-indicator {
                position: fixed;
                top: 50%;
                transform: translateY(-50%);
                background-color: var(--accent-primary);
                color: white;
                padding: 1rem;
                border-radius: 0.5rem;
                font-size: 0.875rem;
                font-weight: 600;
                opacity: 0;
                transition: opacity 0.2s ease;
                z-index: 60;
                pointer-events: none;
            }

            .swipe-indicator.left {
                left: 1rem;
            }

            .swipe-indicator.right {
                right: 1rem;
            }

            .swipe-indicator.show {
                opacity: 0.9;
            }
        }

        /* 加载状态移动端优化 */
        @media (max-width: 768px) {
            #progress-container {
                font-size: 0.875rem;
            }

            #progress-text {
                padding: 0.5rem 0.75rem;
                border-radius: 0 0 0.5rem 0;
            }

            .skeleton-card {
                padding: 1rem;
                margin-bottom: 1rem;
            }
        }

        /* 搜索信息移动端优化 */
        @media (max-width: 768px) {
            #search-info {
                font-size: 1rem;
                padding: 0.75rem;
                background-color: var(--bg-tertiary);
                border-radius: 0.5rem;
                margin-bottom: 1rem;
            }
        }

        /* 月份标题移动端优化 */
        @media (max-width: 768px) {
            .month-header {
                font-size: 1.5rem;
                padding: 1.5rem 0 0.75rem 0;
                text-align: center;
            }
        }

        /* 修复移动端特定问题 */
        @media (max-width: 768px) {

            /* 防止横向滚动 */
            .container {
                overflow-x: hidden;
            }

            /* 优化文本选择 */
            .paper-card {
                -webkit-user-select: text;
                user-select: text;
            }

            /* 优化滚动性能 */
            html {
                scroll-behavior: smooth;
            }

            /* 提升触摸反馈 */
            button:active,
            .keyword-tag:active,
            .suggestion-item:active {
                transform: scale(0.98);
                opacity: 0.8;
            }
        }

        /* 个性化功能样式 */

        /* 模态框样式 */
        /* 模态框样式 - 增强滚动条兼容性 */
        .modal-content {
            max-height: 90vh;
            overflow-y: auto;
        }

        /* Firefox 支持 - 使用特性查询确保兼容性 */
        @supports (scrollbar-width: thin) {
            .modal-content {
                scrollbar-width: thin;
                scrollbar-color: var(--border-secondary) transparent;
            }
        }

        /* WebKit 内核浏览器支持 (Chrome, Safari, Edge) */
        .modal-content::-webkit-scrollbar {
            width: 6px;
        }

        .modal-content::-webkit-scrollbar-track {
            background: transparent;
        }

        .modal-content::-webkit-scrollbar-thumb {
            background-color: var(--border-secondary);
            border-radius: 3px;
        }

        .modal-content::-webkit-scrollbar-thumb:hover {
            background-color: var(--border-primary);
        }

        /* 为不支持自定义滚动条的浏览器提供回退 */
        @supports not (scrollbar-width: thin) {
            .modal-content {
                padding-right: 8px;
                /* 为原生滚动条留出空间 */
            }
        }

        /* 设置面板中的表单控件 */
        .settings-form input[type="number"],
        .settings-form select {
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }

        .settings-form input[type="number"]:focus,
        .settings-form select:focus {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        /* 自定义分类样式 */
        .custom-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
            padding: 0.25rem 0.5rem;
            border-radius: 0.375rem;
            font-size: 0.75rem;
            margin-right: 0.25rem;
            margin-bottom: 0.25rem;
            transition: background-color 0.2s ease;
        }

        .custom-tag:hover {
            background-color: var(--accent-primary);
            color: white;
        }

        .tag-remove {
            cursor: pointer;
            font-weight: bold;
            margin-left: 0.25rem;
            opacity: 0.7;
            transition: opacity 0.2s ease;
        }

        .tag-remove:hover {
            opacity: 1;
        }

        /* 评分星星样式 */
        .star {
            cursor: pointer;
            color: #d1d5db;
            transition: color 0.2s ease;
            font-size: 1.25rem;
            margin-right: 0.125rem;
        }

        .star:hover,
        .star.active {
            color: #fbbf24;
        }

        /* 推荐面板样式 */
        .recommendations-panel {
            -webkit-backdrop-filter: blur(10px);
            backdrop-filter: blur(10px);
            background-color: rgba(255, 255, 255, 0.95);
            border: 1px solid var(--border-primary);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }

        [data-theme="dark"] .recommendations-panel {
            background-color: rgba(30, 41, 59, 0.95);
        }

        /* 阅读统计图表样式 */
        .reading-stats-bar {
            height: 8px;
            background-color: var(--bg-tertiary);
            border-radius: 4px;
            overflow: hidden;
        }

        .reading-stats-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
            border-radius: 4px;
            transition: width 0.3s ease;
        }

        /* 导出按钮样式 */
        .export-btn {
            position: relative;
            overflow: hidden;
        }

        .export-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.3s ease;
        }

        .export-btn:hover::before {
            left: 100%;
        }

        /* 数据管理区域样式 */
        .data-management-section {
            border: 1px solid var(--border-primary);
            border-radius: 0.5rem;
            padding: 1rem;
            background-color: var(--bg-secondary);
            transition: border-color 0.2s ease;
        }

        .data-management-section:hover {
            border-color: var(--accent-primary);
        }

        /* 进度指示器样式 */
        .progress-ring {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: conic-gradient(var(--accent-primary) 0deg, var(--bg-tertiary) 0deg);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .progress-ring::before {
            content: '';
            position: absolute;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--bg-secondary);
        }

        .progress-text {
            position: relative;
            z-index: 1;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* 笔记区域样式 */
        .paper-notes {
            max-height: 0;
            opacity: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
            background-color: var(--bg-tertiary);
            border-radius: 0.375rem;
            margin-top: 0.5rem;
        }

        .paper-notes.visible {
            max-height: 200px;
            opacity: 1;
            padding: 0.75rem;
        }

        .paper-notes textarea {
            width: 100%;
            min-height: 100px;
            padding: 0.5rem;
            border: 1px solid var(--border-primary);
            border-radius: 0.25rem;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            resize: vertical;
            font-size: 0.875rem;
            line-height: 1.4;
        }

        .paper-notes textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
        }

        /* 紧凑视图隐藏某些元素 */
        .compact-view .compact-hidden {
            display: none;
        }

        /* 阅读目标样式 */
        .reading-goal-progress {
            background: linear-gradient(90deg, #10b981, #34d399);
            border-radius: 9999px;
            height: 6px;
            transition: width 0.3s ease;
        }

        /* 工具提示样式 */
        .tooltip {
            position: relative;
        }

        .tooltip::after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            background-color: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 0.5rem 0.75rem;
            border-radius: 0.25rem;
            font-size: 0.75rem;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.2s ease;
            z-index: 1000;
        }

        .tooltip:hover::after {
            opacity: 1;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .modal-content {
                margin: 1rem;
                max-width: calc(100vw - 2rem);
            }

            .recommendations-panel {
                top: auto !important;
                bottom: 4rem;
                left: 1rem;
                right: 1rem;
                width: auto;
            }

            .custom-tag {
                font-size: 0.625rem;
                padding: 0.125rem 0.375rem;
            }

            .star {
                font-size: 1rem;
            }
        }

        /* 动画增强 */
        @keyframes slideIn {
            from {
                transform: translateX(100%);
                opacity: 0;
            }

            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: scale(0.95);
            }

            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        .slide-in {
            animation: slideIn 0.3s ease-out;
        }

        .fade-in {
            animation: fadeIn 0.2s ease-out;
        }

        /* 数据大小指示器 */
        .storage-indicator {
            position: relative;
            display: inline-block;
        }

        .storage-indicator::after {
            content: '';
            position: absolute;
            top: -2px;
            right: -2px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--accent-primary);
            opacity: 0;
            transform: scale(0);
            transition: all 0.2s ease;
        }

        .storage-indicator.has-data::after {
            opacity: 1;
            transform: scale(1);
        }
        .back-to-home-button {
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            padding: 0.5rem 1rem;
            border-radius: 9999px; /* 胶囊形状 */
            cursor: pointer;
            transition: all 0.2s ease;
            border: 1px solid var(--border-primary);
        }
        
        .back-to-home-button:hover {
            background-color: var(--accent-primary);
            color: white;
            border-color: var(--accent-primary);
        }
        
        .back-to-home-button {
            /* ... 其他样式 ... */
            position: fixed;
            bottom: 2rem;
            right: 2rem;
        }
        /* 建议 1：列表项交错加载动画 */
        @keyframes fade-in-up {
          from {
            opacity: 0;
            transform: translateY(15px);
          }
          to {
            opacity: 1;
            transform: translateY(0);
          }
        }
        
/* 新增：GitHub Star 数量徽章通用样式 */
.star-count-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.75rem; /* 12px */
  font-weight: 600;
  padding: 0.125rem 0.5rem; /* 2px 8px */
  border-radius: 9999px;
  min-width: 24px;
  text-align: center;
  border: 1px solid var(--border-primary);
  transition: all 0.2s ease;
}
        
        /* 我们创建一个工具类来触发动画 */
        .paper-card.animate-in {
          /* 使用一个平滑的缓动函数，并设置动画结束时保持最终状态 */
          animation: fade-in-up 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
          /* 关键：动画延迟时间通过一个CSS变量来控制 */
          animation-delay: calc(var(--stagger-index, 0) * 40ms);
        }

        /* === 性能优化相关样式 === */
        
        /* 虚拟滚动优化 */
        .virtual-scroll-container {
          contain: layout style paint;
          will-change: transform;
        }

        .paper-card {
          contain: layout style paint;
          will-change: auto;
        }

        .paper-card:hover {
          will-change: transform, box-shadow;
        }

        /* 减少重绘和回流 */
        .paper-card img,
        .paper-card svg {
          will-change: auto;
        }

        /* 硬件加速 */
        .paper-card-transition {
          transform: translateZ(0);
          backface-visibility: hidden;
          perspective: 1000px;
        }

        /* 懒加载优化 */
        .lazy-loading {
          background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
          background-size: 200% 100%;
          animation: shimmer 2s infinite linear;
        }

        @keyframes shimmer {
          0% { background-position: -200% 0; }
          100% { background-position: 200% 0; }
        }

        /* 内容可见性优化 */
        .paper-card-hidden {
          content-visibility: hidden;
        }

        .paper-card-auto {
          content-visibility: auto;
          contain-intrinsic-size: 280px;
        }

        /* 滚动性能优化 */
        #papers-container {
          overflow-anchor: none; /* 防止滚动锚定问题 */
        }

        /* 高效的网格布局 */
        .papers-grid {
          display: grid;
          grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
          gap: 1rem;
          contain: layout;
        }

        /* 批量操作优化 */
        .batch-update {
          contain: strict;
        }

        /* 动画性能优化 */
        @media (prefers-reduced-motion: reduce) {
          .paper-card.animate-in,
          .lazy-loading {
            animation: none;
            transition: none;
          }
        }

        /* 内存优化的图片处理 */
        .paper-image {
          max-width: 100%;
          height: auto;
          object-fit: cover;
          loading: lazy;
          decoding: async;
        }

        /* 高效的文本渲染 */
        .paper-title,
        .paper-abstract {
          text-rendering: optimizeSpeed;
          font-feature-settings: normal;
        }

        /* 滚动条优化 */
        ::-webkit-scrollbar {
          width: 8px;
          height: 8px;
        }

        ::-webkit-scrollbar-track {
          background: transparent;
        }

        ::-webkit-scrollbar-thumb {
          background-color: rgba(0, 0, 0, 0.2);
          border-radius: 4px;
          transition: background-color 0.2s ease;
        }

        ::-webkit-scrollbar-thumb:hover {
          background-color: rgba(0, 0, 0, 0.4);
        }

        /* 表单性能优化 */
        input[type="search"],
        input[type="text"] {
          will-change: auto;
        }

        input[type="search"]:focus,
        input[type="text"]:focus {
          will-change: border-color, box-shadow;
        }

        /* 移动端性能优化 */
        @media (max-width: 768px) {
          .paper-card {
            contain: layout style;
            will-change: auto;
          }

          .paper-card:active {
            will-change: transform;
          }

          /* 减少移动端动画 */
          .paper-card.animate-in {
            animation-duration: 0.3s;
          }

          /* 优化触摸响应 */
          .paper-card,
          button,
          .keyword-tag {
            touch-action: manipulation;
          }
        }

        /* 高密度显示屏优化 */
        @media (-webkit-min-device-pixel-ratio: 2),
               (min-resolution: 192dpi) {
          .paper-card {
            transform: translateZ(0);
          }
        }

        /* 打印样式优化 */
        @media print {
          .paper-card {
            break-inside: avoid;
            page-break-inside: avoid;
          }
        }