body {
            background: rgb(220, 220, 220);
        }
        .download-main-card {
            border: none;
            border-radius: 24px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
            background: #ffffff;
        }

        /* ===== Hero 区域：浅薄荷绿渐变 + 黑色 Hero 文字配色体系 ===== */
        .section-hero-soft {
            background: linear-gradient(135deg, #f0faf5 0%, #e6f5ee 50%, #eef9f3 100%);
            border-radius: 20px;
            padding: 2.8rem 2rem;
            text-align: center;
            border: 1px solid rgba(0, 120, 72, 0.08);
            box-shadow: 0 4px 20px rgba(0, 120, 72, 0.05);
            position: relative;
            overflow: hidden;
        }
        /* 装饰性光晕 */
        .section-hero-soft::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -40px;
            width: 220px;
            height: 220px;
            background: radial-gradient(circle, rgba(0, 150, 90, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .section-hero-soft::after {
            content: '';
            position: absolute;
            bottom: -50px;
            left: -30px;
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(0, 150, 90, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        /* 标题：对应黑色背景下的白色，浅底上使用深色主文字 */
        .section-hero-soft h2 {
            font-weight: 700;
            color: #1e2a3a;
            letter-spacing: -0.02em;
            position: relative;
            z-index: 1;
            text-align: center !important;
            margin-bottom: 20px;
            font-size: 2.4rem;
        }
        /* 副标题：对应黑色背景下的 rgba(255,255,255,0.9)，浅底上使用等效深色 */
        .section-hero-soft h4 {
            font-weight: 600;
            color: #2c3e50;
            margin-top: 0.8rem;
            font-size: 1.12rem;
            position: relative;
            z-index: 1;
            text-align: center !important;
            margin-top: 20px;
            margin-bottom: 20px;
        }
        /* 描述文字：对应黑色背景下的 rgba(255,255,255,0.75)，浅底上使用等效中深灰 */
        .section-hero-soft .hero-desc {
            display: block;
            margin-top: 1.2rem;
            font-size: 1.02rem;
            color: #4a5b6e;
            line-height: 1.8;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
            position: relative;
            z-index: 1;
            text-align: center !important;
        }

        /* 特性卡片 */
        .feature-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 1.25rem;
            justify-content: center;
            margin-top: 1.5rem;
        }
        .feature-card {
            flex: 0 0 calc(25% - 1.25rem);
            min-width: 200px;
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid rgba(0, 0, 0, 0.04);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
            transition: transform 0.15s, box-shadow 0.15s;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
        }
        .feature-card .card-header {
            background: #f8fafc;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            border-radius: 16px 16px 0 0 !important;
            padding: 1rem 1.25rem;
        }
        .feature-card .card-header h5 {
            font-size: 1.05rem;
            color: #007848;
            font-weight: 600;
            margin: 0;
        }
        .feature-card .card-body {
            padding: 1.25rem;
            font-size: 0.95rem;
            color: #3a4a5e;
            line-height: 1.7;
        }

        /* 价格卡片 */
        .pricing-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
            margin-top: 1.5rem;
        }
        .pricing-card {
            flex: 1 1 240px;
            max-width: 300px;
            background: #ffffff;
            border-radius: 20px;
            border: 1px solid rgba(0, 0, 0, 0.04);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.03);
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            flex-direction: column;
        }
        .pricing-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
        }
        .pricing-card .card-header {
            background: #ffffff;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            padding: 1.25rem 1.5rem;
            border-radius: 20px 20px 0 0 !important;
        }
        .pricing-card .card-header h5 {
            font-weight: 700;
            color: #1e2a3a;
            margin: 0;
        }
        .pricing-card .card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .price-tag {
            font-size: 2.2rem;
            font-weight: 700;
            color: #007848;
            line-height: 1.2;
            margin-bottom: 0.5rem;
        }
        .price-desc {
            font-size: 0.95rem;
            color: #4b5b6e;
            line-height: 1.8;
            flex: 1;
        }
        .note-text {
            color: #6b7a8d;
            font-size: 0.9rem;
        }
        .note-text a {
            color: #007848;
            text-decoration: none;
            font-weight: 500;
        }
        .note-text a:hover {
            text-decoration: underline;
        }

        /* ===== 版本更新日志（时间线） ===== */
        .changelog-section {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid rgba(0, 0, 0, 0.06);
        }
        .changelog-title {
            font-weight: 700;
            color: #1e2a3a;
            font-size: 1.3rem;
            margin-bottom: 2rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .changelog-title i {
            color: #007848;
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 7px;
            top: 6px;
            bottom: 6px;
            width: 2px;
            background: linear-gradient(to bottom, #007848, rgba(0, 120, 72, 0.15));
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            padding-bottom: 2rem;
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-dot {
            position: absolute;
            left: -2rem;
            top: 4px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: #ffffff;
            border: 3px solid #007848;
            box-shadow: 0 0 0 4px rgba(0, 120, 72, 0.08);
            z-index: 1;
        }
        .timeline-item:first-child .timeline-dot {
            background: #007848;
            border-color: #007848;
            box-shadow: 0 0 0 4px rgba(0, 120, 72, 0.15);
        }
        .timeline-content {
            background: #f8fafc;
            border-radius: 14px;
            padding: 1.25rem 1.5rem;
            border: 1px solid rgba(0, 0, 0, 0.04);
            transition: box-shadow 0.2s;
        }
        .timeline-content:hover {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
        }
        .timeline-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 0.6rem;
        }
        .timeline-version {
            font-weight: 700;
            color: #007848;
            font-size: 1.05rem;
            background: rgba(0, 120, 72, 0.08);
            padding: 0.15rem 0.9rem;
            border-radius: 40px;
        }
        .timeline-date {
            font-size: 0.85rem;
            color: #8a9aad;
        }
        .timeline-badge {
            font-size: 0.75rem;
            font-weight: 500;
            padding: 0.2rem 0.7rem;
            border-radius: 40px;
            background: #e8f5ee;
            color: #007848;
        }
        .timeline-badge.fix {
            background: #fff3e0;
            color: #b85c00;
        }
        .timeline-badge.feature {
            background: #e3f2fd;
            color: #0b5e9e;
        }
        .timeline-list {
            list-style: none;
            padding: 0;
            margin: 0.5rem 0 0;
        }
        .timeline-list li {
            position: relative;
            padding-left: 1.4rem;
            font-size: 0.93rem;
            color: #3a4a5e;
            line-height: 1.8;
        }
        .timeline-list li::before {
            content: '•';
            position: absolute;
            left: 0.2rem;
            color: #007848;
            font-weight: 700;
            font-size: 1.1rem;
        }
        @media (max-width: 992px) {
            .feature-card {
                flex: 0 0 calc(50% - 1.25rem);
            }
        }
        @media (max-width: 576px) {
            .feature-card {
                flex: 0 0 100%;
            }
            .timeline {
                padding-left: 1.5rem;
            }
            .timeline-dot {
                left: -1.5rem;
                width: 14px;
                height: 14px;
            }
        }