        /* 全局变量定义 - 保留必要变量，移除冗余 */
        :root {
            --primary: #4361ee;
            --primary-light: #4895ef;
            --secondary: #4cc9f0;
            --accent: #f72585;
            --text-primary: #2b2d42;
            --text-secondary: #6c757d;
            --bg-primary: #ffffff;
            --bg-secondary: #f8f9fa;
            --bg-gradient: linear-gradient(135deg, #4361ee 0%, #4cc9f0 100%);
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-full: 50px;
        }

        /* 基础样式重置 - 精简核心属性，避免冗余计算 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* 自定义滚动条 - 保持轻量，仅必要样式 */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-secondary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-light);
            border-radius: var(--radius-full);
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary);
        }

        /* 主要内容区域 - 简化flex布局，减少嵌套计算 */
        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 2rem 1rem;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
        }

        /* 导航栏 - 核心修复：LOGO居中（justify-content: center） */
        .navbar {
            background-color: var(--bg-primary);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            padding: 1rem 0;
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .navbar-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: flex;
            justify-content: center; /* 关键：LOGO水平居中 */
            align-items: center;
        }
        .navbar-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            /* 确保LOGO本身在容器内居中，避免内容偏移 */
            text-align: center;
        }

        /* 举报容器 - 移除冗余伪元素动画，简化样式 */
        .report-container {
            width: 100%;
            max-width: 600px;
            background-color: var(--bg-primary);
            border-radius: var(--radius-md);
            padding: 2rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(0, 0, 0, 0.05);
            position: relative;
        }
        .report-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--bg-gradient);
            /* 移除不必要的动画，减少重绘 */
        }

        /* 提示信息 - 简化过渡，避免多余动画 */
        .error-message {
            background-color: rgba(247, 37, 133, 0.1);
            border-radius: var(--radius-sm);
            padding: 1rem;
            color: var(--accent);
            margin-bottom: 1.5rem;
            text-align: center;
            border-left: 4px solid var(--accent);
            word-break: break-all;
        }
        .warning-message {
            background-color: rgba(245, 124, 0, 0.1);
            border-radius: var(--radius-sm);
            padding: 1rem;
            color: #E65100;
            margin-bottom: 1.5rem;
            text-align: center;
            border-left: 4px solid #F57C00;
        }
        .debug-info {
            background-color: rgba(0, 0, 0, 0.05);
            border-radius: var(--radius-sm);
            padding: 0.8rem;
            color: #666;
            font-size: 0.75rem;
            margin-top: 1rem;
            text-align: center;
            border: 1px dashed #ddd;
            word-break: break-all;
        }

        /* 标题和说明 - 简化样式，减少字体计算 */
        .report-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 1rem;
            text-align: center;
        }
        .report-description {
            color: var(--text-secondary);
            margin-bottom: 2rem;
            text-align: center;
            line-height: 1.6;
        }

        /* 资源信息卡片 - 简化边框和背景，减少渲染压力 */
        .resource-info-card {
            background-color: var(--bg-secondary);
            border-radius: var(--radius-sm);
            padding: 1.5rem;
            margin-bottom: 2rem;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        .resource-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            line-height: 1.4;
            word-wrap: break-word;
        }
        .disk-type-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.25rem 0.75rem;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            background-color: rgba(67, 97, 238, 0.1);
            color: var(--primary);
        }

        /* 表单样式 - 统一输入框样式，简化过渡 */
        .report-form {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .form-label {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.95rem;
        }
        .form-input,
        .form-textarea {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-family: inherit;
            /* 仅过渡变化的属性：border-color、box-shadow */
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
            background-color: var(--bg-primary);
        }
        .form-input:focus,
        .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
        }
        .form-textarea {
            min-height: 120px;
            resize: vertical;
            line-height: 1.5;
        }
        .form-hint {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 0.25rem;
        }

        /* 举报原因选项 - 简化过渡，避免all属性 */
        .reason-options {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
        }
        .reason-option {
            padding: 1rem;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: var(--radius-sm);
            cursor: pointer;
            /* 仅过渡必要属性：border-color、background-color、transform */
            transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
            background-color: var(--bg-primary);
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .reason-option:hover {
            border-color: var(--primary-light);
            background-color: rgba(67, 97, 238, 0.05);
            transform: translateY(-1px);
        }
        .reason-option.selected {
            border-color: var(--primary);
            background-color: rgba(67, 97, 238, 0.1);
        }
        .reason-option input[type="radio"] {
            width: 1.25rem;
            height: 1.25rem;
            cursor: pointer;
            accent-color: var(--primary);
        }
        .reason-option label {
            cursor: pointer;
            font-weight: 500;
            color: var(--text-primary);
        }

        /* 按钮样式 - 简化伪元素动画，减少性能消耗 */
        .button-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-top: 1rem;
        }
        .submit-button {
            padding: 0.75rem 2rem;
            background: var(--bg-gradient);
            color: white;
            border: none;
            border-radius: var(--radius-full);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            /* 仅过渡transform、box-shadow */
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-width: 150px;
            position: relative;
        }
        .submit-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.2);
            /* 简化过渡，仅left属性 */
            transition: left 0.5s ease;
        }
        .submit-button:hover::before {
            left: 100%;
        }
        .submit-button:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .submit-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }
        .cancel-button {
            padding: 0.75rem 2rem;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            border: none;
            border-radius: var(--radius-full);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            /* 仅过渡background-color、color、transform */
            transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-width: 150px;
        }
        .cancel-button:hover {
            background-color: var(--text-secondary);
            color: white;
            transform: translateY(-1px);
        }

        /* 成功提示 - 简化样式，减少冗余嵌套 */
        .success-message {
            background-color: rgba(76, 175, 80, 0.1);
            border-radius: var(--radius-sm);
            padding: 1.5rem;
            text-align: center;
            margin-top: 2rem;
            border-left: 4px solid #4CAF50;
        }
        .success-icon {
            width: 60px;
            height: 60px;
            background-color: #4CAF50;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.75rem;
            margin: 0 auto 1rem;
        }
        .success-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: #2E7D32;
            margin-bottom: 0.5rem;
        }
        .success-text {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
        }

        /* 页脚样式 - 简化flex布局，减少嵌套 */
        .footer {
            background-color: var(--bg-primary);
            border-top: 1px solid rgba(0, 0, 0, 0.05);
            padding: 2rem 0;
            margin-top: auto;
        }
        .footer-inner {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        .footer-links {
            display: flex;
            gap: 1.5rem;
            margin: 0.5rem 0;
            flex-wrap: wrap;
            justify-content: center;
        }
        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.9rem;
            /* 仅过渡color */
            transition: color 0.2s ease;
            position: relative;
            padding: 0.25rem 0;
        }
        .footer-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background: var(--bg-gradient);
            /* 仅过渡width */
            transition: width 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--primary);
        }
        .footer-links a:hover::after {
            width: 100%;
        }
        .copyright {
            color: var(--text-secondary);
            font-size: 0.85rem;
            text-align: center;
            line-height: 1.5;
            margin-top: 0.5rem;
        }

        /* 响应式设计 - 简化媒体查询，避免重复样式 */
        @media (max-width: 768px) {
            .main-content {
                padding: 1.5rem 1rem;
            }
            .report-container {
                padding: 1.5rem;
            }
            .report-title {
                font-size: 1.5rem;
            }
            .reason-options {
                grid-template-columns: 1fr;
            }
            .button-group {
                flex-direction: column;
            }
            .submit-button,
            .cancel-button {
                width: 100%;
            }
            .navbar-brand {
                font-size: 1.35rem; /* 响应式下LOGO字体适配 */
            }
        }

        @media (max-width: 480px) {
            .main-content {
                padding: 1rem 1rem;
            }
            .report-container {
                padding: 1.25rem;
            }
            .report-title {
                font-size: 1.35rem;
            }
            .resource-info-card {
                padding: 1.25rem;
            }
            .form-input,
            .form-textarea {
                padding: 0.65rem 0.85rem;
            }
            .reason-option {
                padding: 0.85rem;
            }
            .navbar-brand {
                font-size: 1.2rem; /* 手机端LOGO字体进一步适配 */
            }
        }