:root {
            --deepseek-bg: #f7f7f8;
            --deepseek-sidebar: #ffffff;
            --deepseek-primary: #10a37f;
            --deepseek-primary-hover: #0d8c6d;
            --deepseek-secondary: #667eea;
            --deepseek-border: #e5e5e5;
            --deepseek-text: #374151;
            --deepseek-text-secondary: #6b7280;
            --deepseek-warning: #FF9800;
            --deepseek-danger: #dc3545;
            --deepseek-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
            --deepseek-radius: 12px;
            --deepseek-radius-sm: 8px;
            --deepseek-radius-lg: 16px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            color: var(--deepseek-text);
            background-color: var(--deepseek-bg);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .header {
            background: linear-gradient(135deg, var(--deepseek-primary) 0%, var(--deepseek-primary-hover) 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
        }

        .header::after {
            content: '';
            position: absolute;
            bottom: -50%;
            left: -50%;
            width: 250px;
            height: 250px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
        }

        .header-content {
            position: relative;
            z-index: 1;
        }

        .header h1 {
            font-size: 2.8rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }

        .header p {
            font-size: 1.2rem;
            opacity: 0.95;
            font-weight: 400;
        }

        .header .subtitle {
            margin-top: 12px;
            font-size: 1rem;
            opacity: 0.8;
        }

        .back-btn {
            position: fixed;
            top: 24px;
            left: 24px;
            background: rgba(255, 255, 255, 0.9);
            color: var(--deepseek-primary);
            border: none;
            padding: 12px 24px;
            border-radius: var(--deepseek-radius);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: var(--deepseek-shadow);
            z-index: 1000;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(16, 163, 127, 0.2);
        }

        .back-btn:hover {
            background: white;
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(16, 163, 127, 0.2);
            color: var(--deepseek-primary-hover);
        }

        .accept-btn {
            position: fixed;
            top: 24px;
            right: 24px;
            background: var(--deepseek-primary);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: var(--deepseek-radius);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: var(--deepseek-shadow);
            z-index: 1000;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .accept-btn:hover {
            background: var(--deepseek-primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(16, 163, 127, 0.3);
        }

        .content {
            background: var(--deepseek-sidebar);
            border-radius: var(--deepseek-radius-lg);
            border: 1px solid var(--deepseek-border);
            box-shadow: var(--deepseek-shadow);
            padding: 60px;
            margin-bottom: 60px;
            position: relative;
            overflow: hidden;
        }

        .content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(to bottom, var(--deepseek-primary), var(--deepseek-secondary));
        }

        .agreement-header {
            text-align: center;
            margin-bottom: 40px;
            padding-bottom: 30px;
            border-bottom: 1px solid var(--deepseek-border);
        }

        .agreement-header h2 {
            color: var(--deepseek-text);
            margin-bottom: 12px;
            font-size: 2.2rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--deepseek-primary) 0%, var(--deepseek-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .agreement-header .effective-date {
            color: var(--deepseek-text-secondary);
            font-size: 15px;
            font-weight: 500;
        }

        .section {
            margin-bottom: 48px;
            position: relative;
        }

        .section:last-child {
            margin-bottom: 0;
        }

        .section-title {
            font-size: 1.8rem;
            color: var(--deepseek-text);
            margin-bottom: 24px;
            padding-bottom: 16px;
            border-bottom: 2px solid var(--deepseek-border);
            font-weight: 600;
            position: relative;
            padding-left: 32px;
        }

        .section-title::before {
            content: '§';
            position: absolute;
            left: 0;
            color: var(--deepseek-primary);
            font-weight: 700;
            font-size: 1.5rem;
        }

        .section-content {
            font-size: 16px;
            color: var(--deepseek-text);
            line-height: 1.7;
        }

        .section-content p {
            margin-bottom: 20px;
            text-align: justify;
        }

        .section-content ul, .section-content ol {
            margin-left: 24px;
            margin-bottom: 20px;
        }

        .section-content li {
            margin-bottom: 10px;
            position: relative;
            padding-left: 8px;
        }

        .section-content li::before {
            content: '•';
            color: var(--deepseek-primary);
            font-weight: bold;
            position: absolute;
            left: -16px;
        }

        .section-content strong {
            color: var(--deepseek-primary);
            font-weight: 600;
        }

        .section-content a {
            color: var(--deepseek-primary);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

        .section-content a:hover {
            color: var(--deepseek-primary-hover);
            text-decoration: underline;
        }

        .important-notice {
            background-color: rgba(255, 152, 0, 0.1);
            border: 2px solid rgba(255, 152, 0, 0.3);
            padding: 28px;
            border-radius: var(--deepseek-radius);
            margin: 40px 0;
            position: relative;
            overflow: hidden;
        }

        .important-notice::before {
            content: '⚠️';
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 32px;
            opacity: 0.3;
        }

        .important-notice h3 {
            color: var(--deepseek-warning);
            margin-bottom: 16px;
            font-size: 1.3rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .important-notice h3::before {
            content: '❗';
            font-size: 20px;
        }

        .definition-box {
            background-color: rgba(0, 0, 0, 0.03);
            border-left: 4px solid var(--deepseek-text-secondary);
            padding: 24px;
            margin: 28px 0;
            border-radius: 0 var(--deepseek-radius) var(--deepseek-radius) 0;
            position: relative;
            overflow: hidden;
        }

        .definition-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, transparent, rgba(0, 0, 0, 0.02), transparent);
        }

        .definition-box dt {
            font-weight: 600;
            color: var(--deepseek-text);
            margin-bottom: 8px;
            font-size: 16px;
            padding-left: 8px;
            position: relative;
        }

        .definition-box dt::before {
            content: '→';
            position: absolute;
            left: -12px;
            color: var(--deepseek-primary);
        }

        .definition-box dd {
            margin-left: 24px;
            margin-bottom: 16px;
            color: var(--deepseek-text);
            line-height: 1.6;
            padding-left: 8px;
        }

        .acceptance-section {
            background-color: rgba(16, 163, 127, 0.08);
            border-radius: var(--deepseek-radius);
            padding: 40px;
            margin-top: 60px;
            text-align: center;
            border: 1px solid rgba(16, 163, 127, 0.2);
            position: relative;
            overflow: hidden;
        }

        .acceptance-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--deepseek-primary), var(--deepseek-secondary));
        }

        .acceptance-section h3 {
            color: var(--deepseek-primary);
            margin-bottom: 24px;
            font-size: 1.5rem;
            font-weight: 600;
        }

        .checkbox-container {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            margin-bottom: 28px;
        }

        .checkbox-container input {
            width: 20px;
            height: 20px;
            cursor: pointer;
            accent-color: var(--deepseek-primary);
        }

        .checkbox-container label {
            font-size: 16px;
            color: var(--deepseek-text);
            font-weight: 500;
            cursor: pointer;
        }

        .accept-btn-bottom {
            background: var(--deepseek-primary);
            color: white;
            border: none;
            padding: 16px 48px;
            border-radius: var(--deepseek-radius);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            min-width: 200px;
        }

        .accept-btn-bottom::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 0.6s ease;
        }

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

        .accept-btn-bottom:hover {
            background: var(--deepseek-primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(16, 163, 127, 0.3);
        }

        .accept-btn-bottom:disabled {
            background: var(--deepseek-border);
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .accept-btn-bottom:disabled::before {
            display: none;
        }

        .footer {
            background-color: var(--deepseek-text);
            color: var(--deepseek-text-secondary);
            text-align: center;
            padding: 40px 0;
            margin-top: 60px;
            position: relative;
            overflow: hidden;
        }

        .footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--deepseek-primary), var(--deepseek-secondary));
        }

        .footer p {
            margin-bottom: 12px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }

        .footer a {
            color: var(--deepseek-primary);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .footer a:hover {
            color: var(--deepseek-primary-hover);
            text-decoration: underline;
        }

        /* 滚动条样式 */
        ::-webkit-scrollbar {
            width: 8px;
        }

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

        ::-webkit-scrollbar-thumb {
            background: #d1d5db;
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #9ca3af;
        }

        /* 页面加载动画 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .content {
            animation: fadeIn 0.6s ease;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .content {
                padding: 48px 40px;
            }

            .header h1 {
                font-size: 2.4rem;
            }

            .section-title {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 768px) {
            .header {
                padding: 40px 0;
            }

            .header h1 {
                font-size: 2rem;
            }

            .content {
                padding: 32px 24px;
                border-radius: var(--deepseek-radius);
            }

            .section-title {
                font-size: 1.4rem;
            }

            .back-btn, .accept-btn {
                top: 16px;
                left: 16px;
                padding: 10px 20px;
                font-size: 13px;
            }

            .accept-btn {
                left: auto;
                right: 16px;
            }

            .acceptance-section {
                padding: 32px 24px;
            }

            .important-notice,
            .definition-box {
                padding: 24px 20px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }

            .header {
                padding: 32px 0;
                margin-bottom: 24px;
            }

            .header h1 {
                font-size: 1.8rem;
            }

            .header p {
                font-size: 1rem;
            }

            .content {
                padding: 24px 20px;
            }

            .section-title {
                font-size: 1.3rem;
                padding-left: 28px;
            }

            .section-content {
                font-size: 15px;
            }

            .accept-btn-bottom {
                padding: 14px 32px;
                font-size: 15px;
                min-width: 180px;
            }

            .footer {
                padding: 32px 0;
            }
        }

        /* 打印样式 */
        @media print {
            .back-btn, .accept-btn, .acceptance-section, .footer {
                display: none;
            }

            .content {
                box-shadow: none;
                border: 1px solid #ccc;
                padding: 20px;
                margin: 0;
            }

            .header {
                padding: 20px 0;
                margin-bottom: 20px;
            }

            .important-notice {
                break-inside: avoid;
            }
        }

        /* 选中文本样式 */
        ::selection {
            background-color: rgba(16, 163, 127, 0.2);
            color: var(--deepseek-text);
        }