body { background-color: #f4f7f9; font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #1a202c; overflow: hidden; margin: 0; }
        .grid-layout { display: grid; grid-template-columns: 240px 1fr 280px; grid-template-rows: 60px 1fr; height: 100vh; gap: 1px; background-color: #e2e8f0; }
        @media (max-width: 1024px) { .grid-layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr; overflow-y: auto; height: auto; background-color: #f4f7f9; } }
        .header { grid-column: 1 / -1; background: #fff; display: flex; align-items: center; padding: 0 20px; justify-content: space-between; border-bottom: 2px solid #FCD535; }
        .sidebar { background: #fff; padding: 15px; display: flex; flex-direction: column; gap: 20px; overflow-y: auto; }
        .main-content { background: #f8fafc; padding: 20px; overflow-y: auto; scroll-behavior: smooth; }
        .right-panel { background: #fff; padding: 15px; border-left: 1px solid #e2e8f0; overflow-y: auto; }
        .btn-buy { background: #38a169; color: #fff; padding: 8px 16px; border-radius: 4px; font-weight: 600; transition: opacity 0.2s; }
        .btn-buy:hover { opacity: 0.9; }
        .btn-sell { background: #e53e3e; color: #fff; padding: 8px 16px; border-radius: 4px; font-weight: 600; transition: opacity 0.2s; }
        .btn-sell:hover { opacity: 0.9; }
        .tag { font-size: 11px; padding: 2px 6px; background: #edf2f7; border-radius: 3px; color: #4a5568; }
        .nav-item { padding: 8px 12px; border-radius: 4px; font-size: 14px; color: #4a5568; display: block; text-decoration: none; }
        .nav-item:hover { background: #f4f7f9; }
        .nav-item.active { background: #fffbea; color: #b7791f; font-weight: 600; border-left: 3px solid #FCD535; }
        .seo-text { font-size: 12px; line-height: 1.5; color: #718096; }
        
        /* 视频容器特效 */
        .video-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; background: #000; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); cursor: pointer;}
        .video-container iframe, .video-container video, .video-container .video-placeholder { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
        .play-button { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 64px; height: 64px; background: rgba(252, 213, 53, 0.9); border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: all 0.3s ease; }
        .video-container:hover .play-button { transform: translate(-50%, -50%) scale(1.1); background: rgba(252, 213, 53, 1); }
        .play-button::after { content: ''; display: block; width: 0; height: 0; border-style: solid; border-width: 12px 0 12px 20px; border-color: transparent transparent transparent #111; margin-left: 6px; }

        @media (max-width: 1024px) { .sidebar, .right-panel { display: none; } }
        body{
        padding-bottom: 92px;
    }

    .fixed-ad-bar{
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 9999;
        background: rgba(17, 24, 39, 0.96);
        backdrop-filter: blur(10px);
        box-shadow: 0 -8px 24px rgba(0,0,0,0.18);
        border-top: 1px solid rgba(255,255,255,0.08);
    }

    .fixed-ad-inner{
        max-width: 1280px;
        margin: 0 auto;
        padding: 12px 16px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
    }

    .fixed-ad-left{
        display: flex;
        align-items: center;
        gap: 12px;
        min-width: 0;
    }

    .fixed-ad-icon{
        width: 42px;
        height: 42px;
        flex: 0 0 42px;
        border-radius: 9999px;
        background: #facc15;
        color: #111827;
        font-weight: 700;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 14px rgba(250, 204, 21, 0.35);
    }

    .fixed-ad-text{
        min-width: 0;
    }

    .fixed-ad-title{
        color: #ffffff;
        font-size: 15px;
        line-height: 1.3;
        font-weight: 700;
        margin: 0 0 2px;
    }

    .fixed-ad-desc{
        color: rgba(255,255,255,0.75);
        font-size: 12px;
        line-height: 1.4;
        margin: 0;
    }

    .fixed-ad-actions{
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }

    .fixed-ad-btn{
        display: inline-flex;
        align-items: center;
        justify-content: center;
        height: 42px;
        padding: 0 18px;
        border-radius: 9999px;
        font-size: 14px;
        font-weight: 700;
        text-decoration: none;
        transition: all 0.2s ease;
        white-space: nowrap;
    }

    .fixed-ad-btn-download{
        background: #facc15;
        color: #111827;
    }

    .fixed-ad-btn-download:hover{
        background: #fde047;
    }

    .fixed-ad-btn-register{
        background: #ffffff;
        color: #111827;
    }

    .fixed-ad-btn-register:hover{
        background: #f3f4f6;
    }

    @media (max-width: 768px){
        body{
            padding-bottom: 118px;
        }

        .fixed-ad-inner{
            padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
            flex-direction: column;
            align-items: stretch;
        }

        .fixed-ad-left{
            width: 100%;
        }

        .fixed-ad-title{
            font-size: 14px;
        }

        .fixed-ad-desc{
            font-size: 12px;
        }

        .fixed-ad-actions{
            width: 100%;
        }

        .fixed-ad-btn{
            flex: 1;
            height: 40px;
            padding: 0 12px;
        }
    }