/* ---------- 步骤容器 ---------- */
    .how-to-use-section .steps-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 40px;
        max-width: 1200px;
        margin: 0 auto;
    }

    /* ---------- 步骤卡片 ---------- */
    .how-to-use-section .step-card {
        background: white;
        border-radius: var(--radius, 12px);
        box-shadow: var(--shadow, 0 4px 20px rgba(0, 0, 0, 0.08));
        padding: 35px 30px 30px;
        position: relative;
        overflow: hidden;
        border: 1px solid rgba(42, 92, 170, 0.10);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .how-to-use-section .step-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 12px 32px rgba(42, 92, 170, 0.14);
    }

    /* ---------- 步骤编号 ---------- */
    .how-to-use-section .step-number {
        position: absolute;
        top: 18px;
        right: 20px;
        width: 48px;
        height: 48px;
        background: var(--primary, #2A5CAA);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.6rem;
        font-weight: 700;
        font-family: 'Montserrat', sans-serif;
        line-height: 1;
        box-shadow: 0 4px 12px rgba(42, 92, 170, 0.30);
    }

    /* ---------- 步骤标题 ---------- */
    .how-to-use-section .step-title {
        font-size: 1.4rem;
        color: var(--primary, #2A5CAA);
        margin: 0 0 22px 0;
        font-weight: 600;
        font-family: 'Montserrat', sans-serif;
        padding-right: 60px;
    }

    /* ---------- 步骤主体（flex 左右布局） ---------- */
    .how-to-use-section .step-body {
        display: flex;
        gap: 28px;
        align-items: stretch;
    }

    /* --- 左列：操作指引 --- */
    .how-to-use-section .step-guide {
        flex: 0 0 38%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: #f8faff;
        border-radius: 10px;
        padding: 22px 18px;
        text-align: center;
        border: 1px solid #edf2f9;
        min-height: 200px;
    }

    .how-to-use-section .guide-text {
        font-size: 0.95rem;
        color: var(--text-light, #555);
        margin: 0 0 16px 0;
        line-height: 1.5;
    }

    /* 二维码 */
    .how-to-use-section .qr-wrapper {
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-bottom: 14px;
    }

    .how-to-use-section .qr-image {
        width: 130px;
        height: 130px;
        object-fit: contain;
        border-radius: 6px;
        background: white;
        padding: 6px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    }

    .how-to-use-section .qr-caption {
        font-size: 0.8rem;
        color: #888;
        margin-top: 6px;
        font-style: italic;
    }

    /* APK 下载按钮 */
    .how-to-use-section .download-link {
        display: inline-block;
        padding: 10px 28px;
        background: var(--primary, #2A5CAA);
        color: white;
        border-radius: 30px;
        text-decoration: none;
        font-weight: 500;
        font-size: 0.95rem;
        transition: background 0.3s ease, transform 0.2s ease;
        box-shadow: 0 4px 14px rgba(42, 92, 170, 0.25);
    }

    .how-to-use-section .download-link:hover {
        background: var(--primary-light, #4A7CC8);
        transform: translateY(-2px);
    }

    /* App Store 图标 */
    .how-to-use-section .appstore-wrapper {
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-bottom: 6px;
    }

    .how-to-use-section .appstore-image {
        width: 140px;
        height: auto;
        object-fit: contain;
        border-radius: 12px;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        background: white;
        padding: 6px;
    }

    .how-to-use-section .appstore-hint {
        font-size: 0.95rem;
        color: var(--text-light, #555);
        margin-top: 10px;
    }

    .how-to-use-section .appstore-hint strong {
        color: var(--primary, #2A5CAA);
        font-weight: 600;
    }

    /* --- 右列：视频播放器 --- */
    .how-to-use-section .step-video {
        flex: 1;
        display: flex;
        flex-direction: column;
        min-width: 0;
    }

    .how-to-use-section .video-player {
        position: relative;
        width: 100%;
        padding-bottom: 56.25%;
        /* 16:9 */
        background: #111;
        border-radius: 10px;
        overflow: hidden;
        cursor: pointer;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.10);
        transition: box-shadow 0.3s ease;
    }

    .how-to-use-section .video-player:hover {
        box-shadow: 0 6px 24px rgba(0, 0, 0, 0.18);
    }

    .how-to-use-section .video-thumb {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        transition: transform 0.4s ease;
    }

    .how-to-use-section .video-player:hover .video-thumb {
        transform: scale(1.02);
    }

    /* 播放按钮覆盖层 */
    .how-to-use-section .play-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(0, 0, 0, 0.30);
        transition: background 0.3s ease;
    }

    .how-to-use-section .video-player:hover .play-overlay {
        background: rgba(0, 0, 0, 0.20);
    }

    .how-to-use-section .play-btn {
        width: 72px;
        height: 72px;
        background: rgba(255, 255, 255, 0.92);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: transform 0.3s ease, background 0.3s ease;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        backdrop-filter: blur(2px);
    }

    .how-to-use-section .video-player:hover .play-btn {
        transform: scale(1.06);
        background: white;
    }

    .how-to-use-section .play-btn svg {
        margin-left: 4px;
        width: 40px;
        height: 40px;
        filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.20));
    }

    /* 视频加载后 iframe 样式 */
    .how-to-use-section .video-player iframe {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        border: none;
        border-radius: 10px;
    }

    /* 视频标签 */
    .how-to-use-section .video-label {
        font-size: 0.85rem;
        color: #888;
        text-align: center;
        margin: 10px 0 0 0;
        letter-spacing: 0.3px;
        transition: color 0.3s ease;
    }

    .how-to-use-section .step-video:hover .video-label {
        color: var(--primary, #2A5CAA);
    }

    /* ---------- 响应式 ---------- */
    @media (max-width: 1024px) {
        .how-to-use-section .steps-container {
            gap: 30px;
        }

        .how-to-use-section .step-body {
            flex-direction: column;
            gap: 20px;
        }

        .how-to-use-section .step-guide {
            flex: 1 1 auto;
            padding: 20px 16px;
            min-height: auto;
        }

        .how-to-use-section .step-video {
            flex: 1 1 auto;
        }

        .how-to-use-section .step-card {
            padding: 28px 22px 24px;
        }

        .how-to-use-section .step-title {
            font-size: 1.3rem;
            padding-right: 54px;
        }
    }

    @media (max-width: 768px) {
        .how-to-use-section .steps-container {
            grid-template-columns: 1fr;
            gap: 28px;
        }

        .how-to-use-section .step-card {
            padding: 24px 18px 20px;
        }

        .how-to-use-section .step-number {
            width: 40px;
            height: 40px;
            font-size: 1.3rem;
            top: 14px;
            right: 16px;
        }

        .how-to-use-section .step-title {
            font-size: 1.2rem;
            padding-right: 48px;
            margin-bottom: 18px;
        }

        .how-to-use-section .qr-image {
            width: 110px;
            height: 110px;
        }

        .how-to-use-section .appstore-image {
            width: 120px;
        }

        .how-to-use-section .play-btn {
            width: 60px;
            height: 60px;
        }

        .how-to-use-section .play-btn svg {
            width: 32px;
            height: 32px;
        }
    }

    @media (max-width: 480px) {
        .how-to-use-section .step-guide {
            padding: 16px 12px;
        }

        .how-to-use-section .guide-text {
            font-size: 0.9rem;
        }

        .how-to-use-section .download-link {
            padding: 8px 20px;
            font-size: 0.85rem;
        }

        .how-to-use-section .qr-image {
            width: 90px;
            height: 90px;
        }

        .how-to-use-section .appstore-image {
            width: 100px;
        }

        .how-to-use-section .play-btn {
            width: 50px;
            height: 50px;
        }

        .how-to-use-section .play-btn svg {
            width: 26px;
            height: 26px;
        }

        .how-to-use-section .video-label {
            font-size: 0.78rem;
        }
    }