:root {
            --primary-500: #1E40AF;
            --primary-600: #1E3A8A;
            --primary-100: #DBEAFE;
            --primary-50: #EFF6FF;
            --accent-500: #3B82F6;
            --accent-50: #EFF6FF;
            --gold-500: #F59E0B;
            --gold-600: #D97706;
            --gold-50: #FEF3C7;
            --text-primary: #1E293B;
            --text-secondary: #475569;
            --text-tertiary: #94A3B8;
            --bg-page: #F5F7FA;
            --bg-card: #FFFFFF;
            --border-color: #E2E8F0;
            --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.08);
            --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.12);
            --radius-card: 12px;
            --radius-button: 8px;
            --radius-tag: 6px;
            --navbar-height: 64px;
            --content-max-width: 1200px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-page);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        /* ==================== 顶部导航栏 ==================== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--navbar-height);
            background: #fff;
            box-shadow: var(--shadow-small);
            z-index: 1000;
            display: flex;
            align-items: center;
        }
        .navbar-inner {
            max-width: var(--content-max-width);
            width: 100%;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .navbar-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-500);
            white-space: nowrap;
            cursor: pointer;
            flex-shrink: 0;
        }
        .navbar-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary-500);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 800;
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }
        .navbar-nav .nav-item {
            position: relative;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-button);
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 4px;
            white-space: nowrap;
        }
        .navbar-nav .nav-item:hover {
            background: var(--primary-50);
            color: var(--primary-500);
        }
        .navbar-nav .nav-item .arrow {
            font-size: 10px;
            transition: transform 0.2s;
        }
        .navbar-nav .nav-item:hover .arrow {
            transform: rotate(180deg);
        }
        /* 下拉菜单 */
        .nav-item .dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 160px;
            background: #fff;
            border-radius: 10px;
            box-shadow: var(--shadow-large);
            padding: 8px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: all 0.25s ease;
            z-index: 100;
        }
        .nav-item:hover .dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .nav-item .dropdown a {
            display: block;
            padding: 8px 12px;
            font-size: 13px;
            color: var(--text-secondary);
            border-radius: 6px;
            transition: all 0.15s;
        }
        .nav-item .dropdown a:hover {
            background: var(--primary-50);
            color: var(--primary-500);
        }
        .navbar-search {
            flex: 1;
            min-width: 200px;
            max-width: 360px;
            display: flex;
            align-items: center;
            background: var(--bg-page);
            border: 1.5px solid var(--border-color);
            border-radius: var(--radius-button);
            padding: 0 12px;
            height: 40px;
            transition: all 0.2s;
            margin: 0 auto;
        }
        .navbar-search:focus-within {
            border-color: var(--accent-500);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }
        .navbar-search input {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            color: var(--text-primary);
            padding: 0 8px;
        }
        .navbar-search input::placeholder {
            color: var(--text-tertiary);
        }
        .navbar-search .search-btn {
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-tertiary);
            font-size: 16px;
            padding: 4px;
            display: flex;
            align-items: center;
            transition: color 0.2s;
        }
        .navbar-search .search-btn:hover {
            color: var(--primary-500);
        }
        .navbar-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .btn-login {
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: none;
            border: none;
            cursor: pointer;
            border-radius: var(--radius-button);
            transition: all 0.2s;
        }
        .btn-login:hover {
            color: var(--primary-500);
            background: var(--primary-50);
        }
        .btn-register {
            padding: 8px 20px;
            font-size: 14px;
            font-weight: 500;
            color: #fff;
            background: var(--primary-500);
            border: none;
            cursor: pointer;
            border-radius: var(--radius-button);
            transition: all 0.2s;
        }
        .btn-register:hover {
            background: var(--primary-600);
        }
        .btn-vip-nav {
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--gold-600);
            background: var(--gold-50);
            border: 1.5px solid var(--gold-500);
            cursor: pointer;
            border-radius: var(--radius-button);
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 4px;
            white-space: nowrap;
        }
        .btn-vip-nav:hover {
            background: var(--gold-500);
            color: #fff;
        }

        /* ==================== 主体内容 ==================== */
        .main-content {
            margin-top: var(--navbar-height);
        }

        /* ==================== Hero 搜索区 ==================== */
        .hero-section {
            background: linear-gradient(135deg, #1E40AF 0%, #1E3A8A 50%, #1E40AF 100%);
            padding: 80px 24px 72px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 30% 40%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(245, 158, 11, 0.1) 0%, transparent 40%);
            pointer-events: none;
        }
        .hero-inner {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }
        .hero-title {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 1px;
        }
        .hero-subtitle {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 36px;
            letter-spacing: 0.5px;
        }
        .hero-search-box {
            display: flex;
            gap: 12px;
            max-width: 640px;
            margin: 0 auto 20px;
        }
        .hero-search-box input {
            flex: 1;
            height: 56px;
            border: none;
            border-radius: 12px;
            padding: 0 20px;
            font-size: 16px;
            color: var(--text-primary);
            outline: none;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
            transition: box-shadow 0.3s;
        }
        .hero-search-box input:focus {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }
        .hero-search-box input::placeholder {
            color: var(--text-tertiary);
        }
        .hero-search-box .hero-btn-search {
            height: 56px;
            padding: 0 36px;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            background: var(--gold-500);
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.2s;
            white-space: nowrap;
            letter-spacing: 2px;
        }
        .hero-search-box .hero-btn-search:hover {
            background: var(--gold-600);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
        }
        .hero-hot-tags {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
        }
        .hero-hot-tags .hot-label {
            color: rgba(255, 255, 255, 0.5);
        }
        .hero-hot-tags .hot-tag {
            padding: 4px 14px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 20px;
            color: rgba(255, 255, 255, 0.85);
            cursor: pointer;
            transition: all 0.2s;
            font-size: 13px;
        }
        .hero-hot-tags .hot-tag:hover {
            background: rgba(255, 255, 255, 0.25);
            color: #fff;
        }

        /* ==================== 通用区块 ==================== */
        .section {
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 56px 24px 40px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 36px;
        }
        .section-header h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .section-header p {
            font-size: 15px;
            color: var(--text-tertiary);
        }

        /* ==================== 学段分类（三列布局） ==================== */
        .level-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            max-width: 900px;
            margin: 0 auto;
        }
        .level-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            padding: 32px 24px 28px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid transparent;
            box-shadow: var(--shadow-small);
        }
        .level-card:hover {
            border-color: var(--accent-500);
            box-shadow: var(--shadow-medium);
            transform: translateY(-4px);
        }
        .level-card .level-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 30px;
            font-weight: 700;
        }
        .level-card:nth-child(1) .level-icon {
            background: #DBEAFE;
            color: #1E40AF;
        }
        .level-card:nth-child(2) .level-icon {
            background: #DCFCE7;
            color: #166534;
        }
        .level-card:nth-child(3) .level-icon {
            background: #FEF3C7;
            color: #92400E;
        }
        .level-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .level-card .level-subjects {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            justify-content: center;
        }
        .level-card .level-subjects .subject-tag {
            padding: 4px 12px;
            font-size: 13px;
            background: var(--bg-page);
            color: var(--text-secondary);
            border-radius: 20px;
            transition: all 0.2s;
        }
        .level-card:hover .subject-tag {
            background: var(--primary-50);
            color: var(--primary-500);
        }

        /* ==================== 组卷宣传区 ==================== */
        .group-banner {
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .group-banner-inner {
            background: linear-gradient(135deg, #1E40AF 0%, #3B82F6 60%, #60A5FA 100%);
            border-radius: 20px;
            padding: 48px 56px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-large);
        }
        .group-banner-inner::after {
            content: '📝';
            position: absolute;
            right: -20px;
            bottom: -30px;
            font-size: 180px;
            opacity: 0.1;
            pointer-events: none;
        }
        .group-banner-left {
            flex: 1;
            position: relative;
            z-index: 1;
        }
        .group-banner-left .vip-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: rgba(245, 158, 11, 0.2);
            border: 1px solid rgba(245, 158, 11, 0.5);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            color: #FDE68A;
            margin-bottom: 16px;
        }
        .group-banner-left h2 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .group-banner-left p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.7;
            max-width: 480px;
        }
        .group-banner-right {
            display: flex;
            flex-direction: column;
            gap: 12px;
            position: relative;
            z-index: 1;
            flex-shrink: 0;
        }
        .btn-group-cta {
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.2s;
            border: none;
            letter-spacing: 1px;
            white-space: nowrap;
        }
        .btn-group-cta.primary {
            background: #fff;
            color: var(--primary-500);
        }
        .btn-group-cta.primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }
        .btn-group-cta.secondary {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .btn-group-cta.secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
        }

        /* ==================== 平台优势 ==================== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 16px;
        }
        .feature-item {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            padding: 24px 16px;
            text-align: center;
            box-shadow: var(--shadow-small);
            transition: all 0.2s;
        }
        .feature-item:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }
        .feature-item .feature-icon {
            font-size: 28px;
            margin-bottom: 10px;
        }
        .feature-item h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* ==================== Footer ==================== */
        .footer {
            background: #fff;
            border-top: 1px solid var(--border-color);
            padding: 32px 24px;
            margin-top: 40px;
        }
        .footer-inner {
            max-width: var(--content-max-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .footer-links {
            display: flex;
            gap: 20px;
        }
        .footer-links a {
            color: var(--text-tertiary);
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: var(--primary-500);
        }

        /* ==================== 响应式 ==================== */
        @media (max-width: 1024px) {
            .level-grid {
                grid-template-columns: repeat(2, 1fr);
                max-width: 600px;
            }
            .features-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .group-banner-inner {
                flex-direction: column;
                text-align: center;
                padding: 36px 28px;
            }
            .group-banner-left p {
                max-width: 100%;
            }
            .navbar-nav {
                display: none;
            }
            .navbar-search {
                max-width: 200px;
            }
        }
        @media (max-width: 640px) {
            .level-grid {
                grid-template-columns: 1fr;
                max-width: 320px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-title {
                font-size: 26px;
            }
            .hero-search-box {
                flex-direction: column;
            }
            .hero-search-box .hero-btn-search {
                width: 100%;
            }
            .navbar-actions .btn-login {
                display: none;
            }
        }
    }

        :root {
            --primary-500: #1E40AF;
            --primary-600: #1E3A8A;
            --primary-100: #DBEAFE;
            --primary-50: #EFF6FF;
            --accent-500: #3B82F6;
            --accent-50: #EFF6FF;
            --gold-500: #F59E0B;
            --gold-600: #D97706;
            --gold-50: #FEF3C7;
            --text-primary: #1E293B;
            --text-secondary: #475569;
            --text-tertiary: #94A3B8;
            --bg-page: #F5F7FA;
            --bg-card: #FFFFFF;
            --border-color: #E2E8F0;
            --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.08);
            --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.12);
            --radius-card: 12px;
            --radius-button: 8px;
            --navbar-height: 64px;
            --content-max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
            background: var(--bg-page);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }

        /* ========== 通用组件 ========== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--navbar-height);
            background: #fff;
            box-shadow: var(--shadow-small);
            z-index: 1000;
            display: flex;
            align-items: center;
        }
        .navbar-inner {
            max-width: var(--content-max-width);
            width: 100%;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .navbar-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-500);
            cursor: pointer;
            flex-shrink: 0;
        }
        .navbar-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary-500);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 800;
        }
        .navbar-search {
            flex: 1;
            min-width: 150px;
            max-width: 300px;
            display: flex;
            align-items: center;
            background: var(--bg-page);
            border: 1.5px solid var(--border-color);
            border-radius: var(--radius-button);
            padding: 0 12px;
            height: 40px;
            transition: all 0.2s;
            margin: 0 auto;
        }
        .navbar-search input {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            padding: 0 8px;
        }
        .navbar-search .search-btn {
            background: none;
            border: none;
            color: var(--text-tertiary);
            font-size: 16px;
        }
        .navbar-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .btn-login {
            padding: 8px 16px;
            font-size: 14px;
            color: var(--text-secondary);
            background: none;
            border: none;
            border-radius: var(--radius-button);
        }
        .btn-login:hover {
            color: var(--primary-500);
            background: var(--primary-50);
        }
        .btn-register {
            padding: 8px 20px;
            font-size: 14px;
            color: #fff;
            background: var(--primary-500);
            border: none;
            border-radius: var(--radius-button);
        }
        .btn-register:hover {
            background: var(--primary-600);
        }
        .btn-vip-nav {
            padding: 8px 14px;
            font-size: 13px;
            font-weight: 600;
            color: var(--gold-600);
            background: var(--gold-50);
            border: 1.5px solid var(--gold-500);
            border-radius: var(--radius-button);
        }
        .btn-vip-nav:hover {
            background: var(--gold-500);
            color: #fff;
        }
        .main-content {
            margin-top: var(--navbar-height);
            min-height: calc(100vh - var(--navbar-height));
        }
        .page-container {
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 24px;
        }
        .btn-primary {
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: var(--primary-500);
            border: none;
            border-radius: var(--radius-button);
            transition: all 0.2s;
        }
        .btn-primary:hover {
            background: var(--primary-600);
        }
        .btn-gold {
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: var(--gold-500);
            border: none;
            border-radius: var(--radius-button);
            transition: all 0.2s;
        }
        .btn-gold:hover {
            background: var(--gold-600);
        }
        .btn-outline {
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 500;
            color: var(--primary-500);
            background: #fff;
            border: 1.5px solid var(--primary-500);
            border-radius: var(--radius-button);
            transition: all 0.2s;
        }
        .btn-outline:hover {
            background: var(--primary-50);
        }
        .tag {
            padding: 4px 10px;
            font-size: 12px;
            border-radius: 6px;
            background: var(--primary-50);
            color: var(--primary-500);
            display: inline-block;
        }
        .tag-gold {
            background: var(--gold-50);
            color: var(--gold-600);
        }
        .page-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* ========== 各页面显示/隐藏 ========== */
        .page {
            display: none;
        }
        .page.active {
            display: block;
        }

        /* ========== 试卷列表页 ========== */
        .list-layout {
            display: flex;
            gap: 24px;
            align-items: flex-start;
        }
        .filter-sidebar {
            width: 260px;
            flex-shrink: 0;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-small);
            position: sticky;
            top: calc(var(--navbar-height) + 20px);
        }
        .filter-group {
            margin-bottom: 20px;
        }
        .filter-group h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .filter-group label {
            display: block;
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 6px;
            cursor: pointer;
        }
        .filter-group input[type="checkbox"],
        .filter-group input[type="radio"] {
            margin-right: 6px;
        }
        .filter-actions {
            display: flex;
            gap: 8px;
            margin-top: 16px;
        }
        .list-results {
            flex: 1;
        }
        .list-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 16px;
        }
        .list-header .count {
            font-size: 14px;
            color: var(--text-tertiary);
        }
        .sort-tabs {
            display: flex;
            gap: 4px;
        }
        .sort-tabs button {
            padding: 6px 14px;
            font-size: 13px;
            border: none;
            background: none;
            color: var(--text-secondary);
            border-radius: 20px;
        }
        .sort-tabs button.active {
            background: var(--primary-50);
            color: var(--primary-500);
            font-weight: 600;
        }
        .paper-card-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .paper-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-small);
            transition: all 0.2s;
        }
        .paper-card:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }
        .paper-card .card-tags {
            display: flex;
            gap: 6px;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .paper-card h3 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .paper-card .card-desc {
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .paper-card .card-meta {
            font-size: 12px;
            color: var(--text-tertiary);
            margin-bottom: 12px;
            display: flex;
            gap: 12px;
        }
        .paper-card .card-actions {
            display: flex;
            gap: 8px;
        }
        .pagination {
            display: flex;
            justify-content: center;
            gap: 6px;
            margin-top: 24px;
        }
        .pagination button {
            width: 36px;
            height: 36px;
            border: 1px solid var(--border-color);
            background: #fff;
            border-radius: 8px;
            font-size: 13px;
            color: var(--text-secondary);
        }
        .pagination button.active {
            background: var(--primary-500);
            color: #fff;
            border-color: var(--primary-500);
        }

        /* ========== 试卷详情页 ========== */
        .breadcrumb {
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: 16px;
        }
        .breadcrumb span {
            margin: 0 4px;
        }
        .detail-header h1 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .detail-tags {
            display: flex;
            gap: 8px;
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .detail-meta {
            font-size: 13px;
            color: var(--text-secondary);
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .detail-actions {
            display: flex;
            gap: 12px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }
        .detail-actions .btn-primary {
            padding: 12px 28px;
            font-size: 15px;
        }
        .detail-actions .btn-outline {
            padding: 12px 20px;
            font-size: 14px;
        }
        .detail-quota {
            font-size: 12px;
            color: var(--text-tertiary);
            margin-bottom: 24px;
        }
        .preview-box {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 40px 30px;
            box-shadow: var(--shadow-small);
            min-height: 400px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 24px;
            border: 2px dashed var(--border-color);
            text-align: center;
        }
        .preview-box .preview-icon {
            font-size: 48px;
        }
        .preview-box .preview-text {
            font-size: 15px;
            color: var(--text-tertiary);
        }
        .preview-box .preview-hint {
            font-size: 13px;
            color: var(--text-tertiary);
            background: var(--bg-page);
            padding: 8px 16px;
            border-radius: 20px;
        }
        .related-section h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        /* ========== 登录/注册页 ========== */
        .auth-container {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: calc(100vh - var(--navbar-height) - 80px);
            padding: 40px 24px;
        }
        .auth-card {
            background: #fff;
            border-radius: 16px;
            padding: 40px 36px;
            box-shadow: var(--shadow-large);
            width: 100%;
            max-width: 420px;
        }
        .auth-tabs {
            display: flex;
            gap: 0;
            margin-bottom: 24px;
            border-bottom: 2px solid var(--border-color);
        }
        .auth-tabs button {
            flex: 1;
            padding: 12px;
            font-size: 15px;
            font-weight: 500;
            background: none;
            border: none;
            color: var(--text-tertiary);
            border-bottom: 2px solid transparent;
            margin-bottom: -2px;
        }
        .auth-tabs button.active {
            color: var(--primary-500);
            border-bottom-color: var(--primary-500);
            font-weight: 600;
        }
        .auth-form label {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            display: block;
            margin-bottom: 6px;
        }
        .auth-form input {
            width: 100%;
            height: 48px;
            border: 1.5px solid var(--border-color);
            border-radius: var(--radius-button);
            padding: 0 16px;
            font-size: 14px;
            margin-bottom: 16px;
            outline: none;
            transition: all 0.2s;
        }
        .auth-form input:focus {
            border-color: var(--accent-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }
        .auth-form .btn-primary {
            width: 100%;
            height: 48px;
            font-size: 16px;
            border-radius: var(--radius-button);
        }
        .auth-form .auth-links {
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: 16px;
        }
        .auth-divider {
            text-align: center;
            font-size: 13px;
            color: var(--text-tertiary);
            margin: 16px 0;
            position: relative;
        }
        .auth-divider::before,
        .auth-divider::after {
            content: '';
            position: absolute;
            top: 50%;
            width: 40%;
            height: 1px;
            background: var(--border-color);
        }
        .auth-divider::before {
            left: 0;
        }
        .auth-divider::after {
            right: 0;
        }
        .auth-social {
            display: flex;
            gap: 12px;
            justify-content: center;
            margin-top: 16px;
        }
        .auth-social button {
            padding: 10px 20px;
            font-size: 13px;
            border: 1.5px solid var(--border-color);
            background: #fff;
            border-radius: var(--radius-button);
            color: var(--text-secondary);
        }

        /* ========== VIP页面 ========== */
        .vip-hero {
            text-align: center;
            padding: 40px 0 20px;
        }
        .vip-hero h1 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .vip-hero p {
            font-size: 15px;
            color: var(--text-tertiary);
        }
        .vip-plans {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 32px;
        }
        .vip-plan-card {
            background: #fff;
            border-radius: 16px;
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-small);
            border: 2px solid transparent;
            transition: all 0.3s;
            position: relative;
        }
        .vip-plan-card:hover {
            border-color: var(--gold-500);
            box-shadow: var(--shadow-large);
            transform: translateY(-4px);
        }
        .vip-plan-card.featured {
            border-color: var(--gold-500);
            box-shadow: var(--shadow-medium);
        }
        .vip-plan-card .plan-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--gold-500);
            color: #fff;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }
        .vip-plan-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .vip-plan-card .price {
            font-size: 36px;
            font-weight: 700;
            color: var(--gold-600);
            margin-bottom: 4px;
        }
        .vip-plan-card .price-unit {
            font-size: 14px;
            color: var(--text-tertiary);
        }
        .vip-plan-card .btn-gold {
            width: 100%;
            margin-top: 16px;
            padding: 12px;
            font-size: 15px;
        }
        .vip-features {
            margin-top: 40px;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 32px;
            box-shadow: var(--shadow-small);
        }
        .vip-features h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 20px;
            text-align: center;
        }
        .vip-features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .vip-feature-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .vip-feature-item .check {
            color: #10B981;
            font-weight: 700;
        }

        /* ========== 个人中心 ========== */
        .user-layout {
            display: flex;
            gap: 24px;
            align-items: flex-start;
        }
        .user-sidebar {
            width: 220px;
            flex-shrink: 0;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 16px;
            box-shadow: var(--shadow-small);
        }
        .user-sidebar button {
            display: flex;
            align-items: center;
            gap: 10px;
            width: 100%;
            padding: 12px 14px;
            font-size: 14px;
            font-weight: 500;
            background: none;
            border: none;
            border-radius: var(--radius-button);
            color: var(--text-secondary);
            text-align: left;
            transition: all 0.2s;
            margin-bottom: 4px;
        }
        .user-sidebar button:hover {
            background: var(--primary-50);
            color: var(--primary-500);
        }
        .user-sidebar button.active {
            background: var(--primary-50);
            color: var(--primary-500);
            font-weight: 600;
        }
        .user-sidebar button .vip-mark {
            font-size: 12px;
            color: var(--gold-600);
            margin-left: auto;
        }
        .user-content {
            flex: 1;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-small);
            min-height: 400px;
        }
        .user-profile-header {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-bottom: 24px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }
        .user-avatar {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: var(--primary-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 30px;
            color: var(--primary-500);
            font-weight: 700;
            flex-shrink: 0;
        }
        .user-info h2 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .user-info .vip-status {
            font-size: 13px;
            color: var(--gold-600);
            font-weight: 500;
        }
        .user-info .user-email {
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .user-detail-row {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }
        .user-detail-row .label {
            color: var(--text-tertiary);
        }
        .user-detail-row .value {
            font-weight: 500;
        }

        /* ========== 拆题预览页 ========== */
        .split-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 16px;
            flex-wrap: wrap;
            gap: 12px;
        }
        .split-toolbar {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .question-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .question-item {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-small);
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .question-item input[type="checkbox"] {
            width: 20px;
            height: 20px;
            margin-top: 4px;
            flex-shrink: 0;
        }
        .question-body {
            flex: 1;
        }
        .question-body .q-title {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .question-body .q-stem {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }
        .question-body .q-options {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 8px;
            padding-left: 16px;
        }
        .question-body .q-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }

        /* ========== 个人题库页 ========== */
        .tab-bar {
            display: flex;
            gap: 0;
            border-bottom: 2px solid var(--border-color);
            margin-bottom: 20px;
        }
        .tab-bar button {
            padding: 12px 24px;
            font-size: 14px;
            font-weight: 500;
            background: none;
            border: none;
            color: var(--text-tertiary);
            border-bottom: 2px solid transparent;
            margin-bottom: -2px;
        }
        .tab-bar button.active {
            color: var(--primary-500);
            border-bottom-color: var(--primary-500);
            font-weight: 600;
        }
        .question-bank-toolbar {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .question-bank-toolbar select,
        .question-bank-toolbar input {
            height: 38px;
            padding: 0 12px;
            border: 1.5px solid var(--border-color);
            border-radius: var(--radius-button);
            font-size: 13px;
            outline: none;
            background: #fff;
        }
        .selected-count {
            font-size: 13px;
            color: var(--text-secondary);
            margin-left: auto;
        }

        /* ========== 组卷项目页 ========== */
        .project-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }
        .project-table th {
            text-align: left;
            padding: 12px 16px;
            background: var(--bg-page);
            font-weight: 600;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-color);
        }
        .project-table td {
            padding: 14px 16px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-secondary);
        }
        .project-table .project-name {
            font-weight: 600;
            color: var(--text-primary);
        }
        .project-table .status {
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
        }
        .project-table .status.draft {
            background: #FEF3C7;
            color: #92400E;
        }
        .project-table .status.done {
            background: #DCFCE7;
            color: #166534;
        }

        /* ========== 组卷编辑器 ========== */
        .editor-layout {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .editor-sidebar {
            width: 320px;
            flex-shrink: 0;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-small);
        }
        .editor-sidebar h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .editor-question-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
            max-height: 400px;
            overflow-y: auto;
        }
        .editor-question-item {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 12px;
            background: var(--bg-page);
            border-radius: 8px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.2s;
        }
        .editor-question-item:hover {
            background: var(--primary-50);
        }
        .editor-question-item .drag {
            color: var(--text-tertiary);
            cursor: grab;
        }
        .editor-question-item .remove {
            margin-left: auto;
            color: #EF4444;
            cursor: pointer;
            background: none;
            border: none;
            font-size: 16px;
        }
        .editor-preview {
            flex: 1;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 32px;
            box-shadow: var(--shadow-small);
            min-height: 500px;
        }
        .editor-preview .preview-paper-title {
            font-size: 20px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 24px;
        }
        .editor-preview .preview-section-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .editor-preview .preview-question {
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--border-color);
        }
        .editor-toolbar {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 16px;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .list-layout,
            .user-layout,
            .editor-layout {
                flex-direction: column;
            }
            .filter-sidebar,
            .user-sidebar,
            .editor-sidebar {
                width: 100%;
                position: static;
            }
            .paper-card-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .vip-plans {
                grid-template-columns: 1fr;
            }
            .vip-features-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 640px) {
            .navbar-search {
                max-width: 120px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .vip-plans {
                grid-template-columns: 1fr;
            }
        }
    }

/* ============ 试卷网扩展样式（动态页面） ============ */
.tag { display:inline-block; padding:2px 10px; border-radius:var(--radius-tag); background:var(--primary-50); color:var(--primary-600); font-size:12px; line-height:20px; }
.tag-gold { background:var(--gold-50); color:var(--gold-600); }
.page-title { font-size:22px; font-weight:700; margin:0; }
.breadcrumb { display:flex; gap:6px; font-size:13px; color:var(--text-tertiary); margin:0 0 16px; }
.breadcrumb a { color:var(--primary-500); }
.filter-group h4 { font-size:14px; color:var(--text-primary); margin:0 0 10px; }
.checkbox-list { max-height:210px; overflow:auto; }
.checkbox-item { display:flex; align-items:center; gap:8px; padding:4px 0; font-size:13px; color:var(--text-secondary); cursor:pointer; }
.checkbox-item input { accent-color:var(--primary-500); }
.checkbox-item:hover { color:var(--primary-600); }
.filter-select { width:100%; padding:7px 10px; border:1px solid var(--border-color); border-radius:var(--radius-button); font-size:13px; color:var(--text-primary); background:#fff; outline:none; }
.filter-select:focus { border-color:var(--accent-500); }
.mt-2 { margin-top:8px; } .mt-3 { margin-top:12px; } .mt-4 { margin-top:20px; } .mb-2 { margin-bottom:8px; } .mb-3 { margin-bottom:12px; } .mb-4 { margin-bottom:20px; } .mr-2{margin-right:8px;} .ml-auto{margin-left:auto;} .d-flex{display:flex;} .align-center{align-items:center;} .gap-2{gap:8px;} .gap-3{gap:12px;} .flex-wrap{flex-wrap:wrap;} .text-secondary{color:var(--text-secondary)!important;} .text-tertiary{color:var(--text-tertiary)!important;} .text-primary{color:var(--primary-500)!important;} .text-gold{color:var(--gold-500)!important;} .text-danger{color:#DC2626!important;} .text-success{color:#16A34A!important;} .fs-12{font-size:12px;} .fs-14{font-size:14px;} .fs-16{font-size:16px;} .fw-bold{font-weight:700;} .text-ellipsis{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.alert-info,.alert-success,.alert-warning,.alert-danger{border-radius:var(--radius-card); border:1px solid var(--border-color); padding:12px 16px; font-size:14px; margin-bottom:16px;}
.question-block { background:#fff; border:1px solid var(--border-color); border-radius:var(--radius-card); padding:16px; margin-bottom:12px; box-shadow:var(--shadow-small); }
.q-meta { display:flex; align-items:center; gap:8px; margin-bottom:8px; }
.q-stem { color:var(--text-primary); line-height:1.8; white-space:pre-line; }
.q-options { display:grid; grid-template-columns:1fr 1fr; gap:4px 24px; margin-top:8px; font-size:14px; color:var(--text-secondary); }
.answer-line { margin-top:8px; font-size:13px; color:var(--text-secondary); }
.form-item { margin-bottom:14px; } .form-item label{display:block;font-size:13px;color:var(--text-secondary);margin-bottom:6px;}
.form-input,.form-select{width:100%;padding:9px 12px;border:1px solid var(--border-color);border-radius:var(--radius-button);font-size:14px;font-family:inherit;color:var(--text-primary);background:#fff;outline:none;}
.form-input:focus,.form-select:focus{border-color:var(--accent-500);box-shadow:0 0 0 3px rgba(59,130,246,.12);}
.btn-sm{padding:6px 12px;font-size:12px;}
.stat-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-small);}
.upload-zone{border:2px dashed var(--border-color);border-radius:var(--radius-card);padding:36px 20px;text-align:center;color:var(--text-tertiary);background:var(--bg-card);cursor:pointer;}
.upload-zone:hover{border-color:var(--accent-500);color:var(--primary-500);}
.row{display:flex;flex-wrap:wrap;margin:0 -10px;} .col,.col-md-4,.col-md-6,.col-md-8,.col-md-3,.col-lg-9,.col-lg-3,.col-6,.col-12,.col-md-7,.col-md-5{padding:0 10px;box-sizing:border-box;}
.col-6{width:50%;} .col-12{width:100%;} .col-md-3{width:25%;} .col-md-4{width:33.3333%;} .col-md-5{width:41.6667%;} .col-md-6{width:50%;} .col-md-7{width:58.3333%;} .col-md-8{width:66.6667%;} .col-lg-3{width:25%;} .col-lg-9{width:75%;}
@media(max-width:992px){.col-md-3,.col-md-4,.col-md-5,.col-md-6,.col-md-7,.col-md-8,.col-lg-3,.col-lg-9{width:100%;}}
@media(max-width:640px){.col-6{width:100%;}}
.pagination{display:flex;justify-content:center;gap:6px;margin:20px 0;list-style:none;padding:0;}
.pagination .page-link{display:inline-flex;min-width:34px;height:34px;padding:0 6px;align-items:center;justify-content:center;border:1px solid var(--border-color);border-radius:var(--radius-button);color:var(--text-secondary);font-size:13px;background:#fff;}
.pagination .active .page-link{background:var(--primary-500);color:#fff;border-color:var(--primary-500);}
.pagination .disabled .page-link{opacity:.45;pointer-events:none;}
.table{width:100%;border-collapse:collapse;font-size:14px;} .table th{background:#F8FAFC;color:var(--text-secondary);font-weight:600;padding:10px 12px;border-bottom:1px solid var(--border-color);text-align:left;} .table td{padding:10px 12px;border-bottom:1px solid var(--border-color);color:var(--text-primary);}
.btn-gold{background:linear-gradient(135deg,#F59E0B,#D97706);color:#fff;border:none;padding:10px 22px;border-radius:var(--radius-button);font-weight:600;font-size:14px;cursor:pointer;}
.btn-gold:hover{opacity:.92;}


/* ============ Bootstrap 组件统一皮肤 ============ */
.btn{border-radius:var(--radius-button);font-weight:500;font-family:inherit;}
.btn-primary{background:var(--primary-500);border:1px solid var(--primary-500);}
.btn-primary:hover,.btn-primary:focus{background:var(--primary-600);border-color:var(--primary-600);}
.btn-outline-primary{color:var(--primary-500);border-color:var(--primary-500);}
.btn-outline-primary:hover{background:var(--primary-50);color:var(--primary-600);}
.btn-outline-secondary{color:var(--text-secondary);border-color:var(--border-color);}
.btn-outline-secondary:hover{background:var(--bg-page);color:var(--text-primary);}
.btn-outline-danger{color:#DC2626;border-color:#FECACA;}
.btn-outline-danger:hover{background:#FEF2F2;color:#B91C1C;}
.btn-warning{background:linear-gradient(135deg,#F59E0B,#D97706);border:none;color:#fff;}
.btn-warning:hover{color:#fff;opacity:.92;}
.btn-success{background:#16A34A;border-color:#16A34A;}
.btn-info{background:#0EA5E9;border-color:#0EA5E9;}
.form-control,.form-select{border:1px solid var(--border-color);border-radius:var(--radius-button);padding:8px 12px;font-size:14px;}
.form-control:focus,.form-select:focus{border-color:var(--accent-500);box-shadow:0 0 0 3px rgba(59,130,246,.12);}
.form-label{color:var(--text-secondary);font-size:13px;}
.card{border:1px solid var(--border-color);border-radius:var(--radius-card);box-shadow:var(--shadow-small);}
.card-header{background:#F8FAFC;border-bottom:1px solid var(--border-color);font-weight:600;color:var(--text-primary);}
.badge{border-radius:var(--radius-tag);font-weight:500;}
.alert{border-radius:var(--radius-card);font-size:14px;}
.list-group-item{border-color:var(--border-color);color:var(--text-primary);}
.page-link{color:var(--primary-500);border-color:var(--border-color);}
.page-item.active .page-link{background:var(--primary-500);border-color:var(--primary-500);}
.text-muted{color:var(--text-tertiary)!important;}


/* ============ 布局修复：顶部导航 ============ */
.navbar{height:var(--navbar-height,64px);}
.navbar-inner{height:var(--navbar-height,64px);flex-wrap:nowrap;align-items:center;}
.navbar-nav{flex-direction:row;align-items:center;gap:4px;height:64px;}
.navbar-nav .nav-item{height:64px;display:flex;align-items:center;position:relative;margin:0 2px;}
.navbar-nav .nav-item > a{display:flex;align-items:center;height:100%;}
.navbar-nav .nav-item .dropdown{top:100%;left:0;}
.navbar-search{margin:0 auto 0 8px;}
@media(max-width:1100px){.navbar-nav .nav-item .dropdown{display:none;}.navbar-nav{gap:0;}}

.btn-danger-armed{background:#DC2626;border:1px solid #DC2626;color:#fff;border-radius:var(--radius-button);padding:8px 12px;font-size:13px;cursor:pointer;}


/* 富文本相关 */
.mini-toolbar{display:flex;gap:4px;flex-wrap:wrap;padding:4px 6px;background:#F8FAFC;border:1px solid var(--border-color);border-bottom:none;border-radius:8px 8px 0 0;}
.mini-toolbar button{border:1px solid var(--border-color);background:#fff;color:var(--text-primary);border-radius:6px;padding:3px 10px;font-size:13px;cursor:pointer;}
.mini-toolbar button:hover{background:var(--primary-50);color:var(--primary-600);}
.ql-container.ql-snow{font-size:15px;line-height:1.8;}
.rich-content p{margin:0 0 6px;}
.rich-content .katex-display{margin:6px 0;}
.rich-content img{max-width:100%;border-radius:4px;}


/* ============ 富文本图片：缩放/拖拽（题干、选项编辑器） ============ */
.sw-qi-host{position:relative;}
.sw-qi-host .ql-editor img{max-width:100%;border-radius:4px;cursor:default;}
.sw-qi-host img.sw-qi-selected{outline:2px dashed var(--primary-600,#2563eb);outline-offset:2px;cursor:move;}
.sw-qi-host img.sw-qi-moving{opacity:.25 !important;}
.sw-qi-overlay{position:absolute;inset:0;pointer-events:none;z-index:20;}
.sw-qi-handle{position:absolute;width:11px;height:11px;background:#fff;border:1.5px solid var(--primary-600,#2563eb);border-radius:3px;box-shadow:0 0 0 1px rgba(255,255,255,.7);pointer-events:auto;z-index:21;}
.sw-qi-handle:hover{background:var(--primary-600,#2563eb);transform:scale(1.15);}
.sw-qi-handle.sw-qi-nw{cursor:nw-resize;}
.sw-qi-handle.sw-qi-ne{cursor:ne-resize;}
.sw-qi-handle.sw-qi-sw{cursor:sw-resize;}
.sw-qi-handle.sw-qi-se{cursor:se-resize;}
.sw-qi-tip{position:absolute;right:4px;bottom:4px;background:rgba(15,23,42,.78);color:#fff;font-size:12px;line-height:1;padding:4px 7px;border-radius:4px;display:none;pointer-events:none;z-index:22;font-family:Consolas,Menlo,monospace;}
.sw-qi-indicator{position:absolute;width:2px;background:var(--primary-600,#2563eb);z-index:23;display:none;pointer-events:none;border-radius:1px;box-shadow:0 0 4px rgba(37,99,235,.55);}
.sw-qi-ghost{position:fixed;z-index:9999;opacity:.85;pointer-events:none;box-shadow:0 8px 22px rgba(15,23,42,.3);border-radius:4px;background:#fff;padding:2px;}
body.sw-qi-dragging,body.sw-qi-dragging *{user-select:none !important;-webkit-user-select:none !important;}


/* ============ 全站分页统一样式 ============ */
.pagination{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:8px;
    margin:24px 0 8px;
    padding:8px;
    list-style:none;
    flex-wrap:wrap;
}
.pagination .page-link,
.pagination button{
    min-width:38px;
    height:38px;
    padding:0 11px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    border:1px solid #dfe6f0;
    border-radius:11px;
    background:#fff;
    color:#475569;
    font-size:13px;
    font-weight:650;
    line-height:1;
    text-decoration:none;
    cursor:pointer;
    box-shadow:0 2px 6px rgba(15,23,42,.035);
    transition:transform .16s ease, box-shadow .16s ease, color .16s ease, background .16s ease, border-color .16s ease;
}
.pagination .page-link:hover,
.pagination button:hover{
    color:#1d4ed8;
    border-color:#93c5fd;
    background:#eff6ff;
    transform:translateY(-1px);
    box-shadow:0 6px 14px rgba(37,99,235,.12);
}
.pagination .page-link.active,
.pagination .page-item.active .page-link,
.pagination button.active{
    color:#fff;
    border-color:transparent;
    background:linear-gradient(135deg,#2563eb,#4f46e5);
    box-shadow:0 8px 18px rgba(37,99,235,.3);
    transform:translateY(-1px) scale(1.05);
    font-weight:850;
}
.pagination .page-link.disabled,
.pagination .page-item.disabled .page-link,
.pagination button.disabled,
.pagination button:disabled{
    opacity:.35;
    pointer-events:none;
    color:#94a3b8;
    background:#f8fafc;
    box-shadow:none;
    transform:none;
}
.pagination .page-link:focus-visible,
.pagination button:focus-visible,
.pl-pager a:focus-visible,
.pager a:focus-visible{
    outline:3px solid rgba(37,99,235,.2);
    outline-offset:2px;
}

/* 试卷库分页 */
body .pl-pager{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:8px;
    margin-top:28px;
    flex-wrap:wrap;
}
body .pl-pager a,
body .pl-pager span{
    min-width:38px;
    height:38px;
    padding:0 11px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    border:1px solid #dfe6f0;
    border-radius:11px;
    background:#fff;
    color:#475569;
    font-size:13px;
    font-weight:650;
    text-decoration:none;
    box-shadow:0 2px 6px rgba(15,23,42,.035);
    transition:transform .16s ease, box-shadow .16s ease, color .16s ease, background .16s ease, border-color .16s ease;
}
body .pl-pager a:hover{
    color:#1d4ed8;
    border-color:#93c5fd;
    background:#eff6ff;
    transform:translateY(-1px);
    box-shadow:0 6px 14px rgba(37,99,235,.12);
}
body .pl-pager a.active{
    color:#fff !important;
    border-color:transparent !important;
    background:linear-gradient(135deg,#2563eb,#4f46e5) !important;
    box-shadow:0 8px 18px rgba(37,99,235,.3) !important;
    transform:translateY(-1px) scale(1.05);
    font-weight:850 !important;
}
body .pl-pager .pl-disabled{
    opacity:.35;
    pointer-events:none;
    background:#f8fafc;
    box-shadow:none;
}
body .pl-pager .pl-dots{
    border-color:transparent;
    background:transparent;
    box-shadow:none;
    color:#94a3b8;
}

/* 后台分页 */
body.admin-body .pager{
    display:flex;
    justify-content:flex-end;
    align-items:center;
    gap:8px;
    padding:16px 18px;
    flex-wrap:wrap;
}
body.admin-body .pager .pg-info{
    margin-right:auto;
    padding:7px 12px;
    border:1px solid #e8edf5;
    border-radius:999px;
    background:#f8fafc;
    color:#64748b;
    font-size:12.5px;
    line-height:1;
}
body.admin-body .pager a,
body.admin-body .pager span:not(.pg-info){
    min-width:38px;
    height:38px;
    padding:0 11px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    border:1px solid #dfe6f0;
    border-radius:10px;
    background:#fff;
    color:#475569;
    font-size:13px;
    font-weight:650;
    text-decoration:none;
    box-shadow:0 2px 6px rgba(15,23,42,.035);
    transition:transform .16s ease, box-shadow .16s ease, color .16s ease, background .16s ease, border-color .16s ease;
}
body.admin-body .pager a:hover{
    color:#4f46e5;
    border-color:#c4b5fd;
    background:#f5f3ff;
    transform:translateY(-1px);
    box-shadow:0 6px 14px rgba(79,70,229,.14);
}
body.admin-body .pager a.active{
    color:#fff;
    border-color:transparent;
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
    box-shadow:0 8px 18px rgba(79,70,229,.32);
    transform:translateY(-1px) scale(1.05);
    font-weight:850;
}
body.admin-body .pager a.disabled{
    opacity:.35;
    pointer-events:none;
    color:#94a3b8;
    background:#f8fafc;
    box-shadow:none;
    transform:none;
}

@media(max-width:640px){
    body .pagination,
    body .pl-pager,
    body.admin-body .pager{
        justify-content:flex-start;
        flex-wrap:nowrap;
        overflow-x:auto;
        padding-bottom:8px;
        -webkit-overflow-scrolling:touch;
    }
    body.admin-body .pager .pg-info{
        flex:none;
        margin-right:8px;
    }
}

/* AI 拆题图片占位符 */
.ai-image-placeholder,
.rich-content .ai-image-placeholder,
.ql-editor .ai-image-placeholder{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:34px;
    padding:5px 12px;
    margin:2px 4px;
    border:1px dashed #f59e0b;
    border-radius:8px;
    background:linear-gradient(135deg,#fffbeb,#fff7ed);
    color:#b45309;
    font-size:12.5px;
    font-weight:700;
    line-height:1.4;
    vertical-align:middle;
}


/* ==================== 富文本图片提示 ==================== */
.paper-image-toast-host {
    position: fixed;
    top: 92px;
    right: 20px;
    z-index: 12000;
    width: min(370px, calc(100vw - 32px));
    display: grid;
    gap: 10px;
    pointer-events: none;
}

.paper-image-toast {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 13px 14px;
    border: 1px solid #dbeafe;
    border-radius: 14px;
    background: rgba(255, 255, 255, .98);
    box-shadow: 0 18px 46px rgba(15, 23, 42, .16);
    color: #334155;
    font-size: 13px;
    line-height: 1.65;
    pointer-events: auto;
    animation: paperImageToastIn .22s ease-out both;
}

.paper-image-toast.is-warning {
    border-color: #fcd34d;
    background: #fffbeb;
    color: #92400e;
}

.paper-image-toast.is-error {
    border-color: #fca5a5;
    background: #fef2f2;
    color: #b91c1c;
}

.paper-image-toast.is-success {
    border-color: #86efac;
    background: #f0fdf4;
    color: #166534;
}

.paper-image-toast__icon {
    width: 22px;
    height: 22px;
    display: grid;
    place-items: center;
    flex: none;
    margin-top: 1px;
    border-radius: 50%;
    color: #fff;
    background: #2563eb;
    font-size: 12px;
    font-weight: 900;
}

.paper-image-toast.is-warning .paper-image-toast__icon { background: #d97706; }
.paper-image-toast.is-error .paper-image-toast__icon { background: #dc2626; }
.paper-image-toast.is-success .paper-image-toast__icon { background: #16a34a; }

.paper-image-toast__text {
    min-width: 0;
}

.paper-image-toast.is-leaving {
    animation: paperImageToastOut .2s ease-in both;
}

@keyframes paperImageToastIn {
    from { opacity: 0; transform: translate3d(18px, 0, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes paperImageToastOut {
    from { opacity: 1; transform: translate3d(0, 0, 0); }
    to { opacity: 0; transform: translate3d(18px, 0, 0); }
}

@media (max-width: 640px) {
    .paper-image-toast-host {
        top: auto;
        right: 14px;
        bottom: 14px;
        left: 14px;
        width: auto;
    }

    .paper-image-toast {
        font-size: 12.5px;
    }
}