@import url('https://fonts.googleapis.com/css2?family=Pretendard:wght@100;400;600;800&family=Montserrat:wght@200;800&display=swap');

    body { margin: 0; padding: 20px; background-color: #f5f7fa; }

    /* 전체 컨테이너 및 레이아웃 */
    .nb-white-widget {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        min-height: 600px;
        background: #ffffff;
        border-radius: 40px;
        position: relative;
        overflow: hidden;
        padding: 60px;
        box-sizing: border-box;
        font-family: 'Pretendard', sans-serif;
        color: #1a1e23;
        box-shadow: 0 30px 60px rgba(0,0,0,0.05);
        border: 1px solid #f0f2f5;
        display: flex;
        flex-direction: column;
    }

    .nb-content-inner {
        position: relative;
        z-index: 5;
        display: flex;
        gap: 50px;
        flex: 1;
        align-items: flex-start;
    }

    /* 텍스트 영역 */
    .nb-text-frame { flex: 1.8; }

    /* 우측 비디오 프레임 (디자인 최적화) */
    .nb-image-frame {
        flex: 1;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100%;
        margin-top: 50px;
        position: relative; /* 사운드 버튼 배치용 */
    }

    .nb-video-container {
        width: 100%;
        max-width: 380px;
        aspect-ratio: 4 / 5;
        position: relative;
        background: #000;
        border-radius: 30px;
        overflow: hidden;
        box-shadow: 0 20px 50px rgba(59, 130, 246, 0.15);
        border: 1px solid rgba(255, 255, 255, 0.1);
        transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    }

    /* 비디오 컨테이너 호버 효과 유지 (단, 버튼 클릭을 위해 scale은 약간 축소하거나 조정) */
    .nb-image-frame:hover .nb-video-container {
        transform: translateY(-10px);
        box-shadow: 0 30px 70px rgba(59, 130, 246, 0.25);
    }

    .nb-video-content {
        width: 100%;
        height: 100%;
        object-fit: cover; /* 영상을 영역에 꽉 채움 */
    }

    /* 비디오 위 오버레이 (디자인 터치) */
    .nb-video-overlay {
        position: absolute;
        top: 0; left: 0; width: 100%; height: 100%;
        background: linear-gradient(180deg, rgba(15, 23, 42, 0.2) 0%, rgba(37, 99, 235, 0.1) 100%);
        mix-blend-mode: overlay;
        z-index: 2;
        pointer-events: none; /* 오버레이는 클릭 방해 안 함 */
    }

    /* [추가] 사운드 제어 버튼 스타일 */
    .nb-sound-control {
        position: absolute;
        bottom: 20px;
        right: calc(50% - 170px); /* 비디오 컨테이너 내 오른쪽 하단 배치 */
        z-index: 10;
        width: 36px;
        height: 36px;
        background: rgba(255, 255, 255, 0.15);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 50%;
        color: rgba(255, 255, 255, 0.8);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.3s ease;
        font-size: 14px;
    }

    .nb-sound-control:hover {
        background: rgba(255, 255, 255, 0.3);
        transform: scale(1.1);
        color: #ffffff;
    }

    /* 다이나믹 배경 빛 효과 */
    .nb-light-sphere {
        position: absolute;
        top: -150px;
        right: -150px;
        width: 450px;
        height: 450px;
        background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
        border-radius: 50%;
        animation: floating 8s infinite ease-in-out;
    }

    @keyframes floating {
        0%, 100% { transform: translate(0, 0); }
        50% { transform: translate(-30px, 30px); }
    }

    /* 상단 메타 정보 */
    .nb-top-meta {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 50px;
    }

    .nb-sys-badge {
        display: flex;
        align-items: center;
        gap: 8px;
        background: #f8fafc;
        padding: 6px 14px;
        border-radius: 30px;
        border: 1px solid #e2e8f0;
    }

    .nb-sys-badge .dot {
        width: 6px; height: 6px; background: #ef4444; border-radius: 50%;
        box-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
        animation: blink 1.5s infinite;
    }

    .nb-sys-badge .text { font-size: 10px; font-weight: 800; color: #64748b; letter-spacing: 0.5px; }
    .nb-version-tag { font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 200; color: #94a3b8; }

    /* 메인 타이틀 */
    .nb-hero-section { margin-bottom: 60px; }
    .nb-main-title {
        font-family: 'Montserrat', sans-serif;
        font-size: 52px;
        line-height: 1.1;
        margin: 0;
        letter-spacing: -2px;
        color: #0f172a;
    }
    .nb-thin { font-weight: 200; color: #94a3b8; }
    .nb-bold { font-weight: 800; background: linear-gradient(to right, #2563eb, #7c3aed); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

    .nb-divider { width: 60px; height: 4px; background: #2563eb; margin: 25px 0; border-radius: 2px; }
    .nb-lead-text { font-size: 18px; line-height: 1.7; color: #475569; }

    /* 가치 그리드 */
    .nb-value-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 40px 25px;
        margin-bottom: 30px;
    }
    .nb-value-item { position: relative; }
    .nb-value-no { font-family: 'Montserrat', sans-serif; font-size: 36px; font-weight: 800; color: #f1f5f9; position: absolute; top: -18px; left: -5px; z-index: -1; }
    .nb-value-item h3 { font-size: 15px; font-weight: 800; color: #1e293b; margin: 0 0 12px 0; letter-spacing: 1.5px; }
    .nb-value-item p { font-size: 13.5px; line-height: 1.6; color: #64748b; margin: 0; word-break: keep-all; }

    /* 푸터 정보 */
    .nb-info-footer {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding-top: 30px;
        border-top: 1px solid #f1f5f9;
        margin-top: auto;
    }
    .nb-stats { display: flex; gap: 30px; }
    .stat-node { display: flex; flex-direction: column; }
    .stat-label { font-size: 9px; font-weight: 800; color: #94a3b8; }
    .stat-val { font-family: 'Montserrat', sans-serif; font-size: 14px; font-weight: 800; color: #2563eb; }
    .nb-copyright { font-size: 11px; color: #cbd5e1; }

    @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

    /* 반응형 */
    @media (max-width: 992px) {
        .nb-content-inner { flex-direction: column; }
        .nb-image-frame { width: 100%; max-width: 100%; margin-top: 0; }
        .nb-video-container { max-width: 380px; margin: 0 auto; aspect-ratio: 4 / 5; } /* 반응형에서도 비율 유지 */
        .nb-sound-control { right: calc(50% - 170px); } /* 버튼 위치 조정 */
        .nb-value-grid { grid-template-columns: 1fr 1fr; }
        .nb-main-title { font-size: 42px; }
    }

    @media (max-width: 480px) {
        .nb-value-grid { grid-template-columns: 1fr; }
        .nb-sound-control { right: 20px; bottom: 20px; } /* 모바일에서 버튼 위치 고정 */
    }