.container-flex {
    display: flex;
    gap: 30px;
    max-width: 1200px;
    margin: 30px auto;
    align-items: flex-start;
}

.responsive-pdf-container {
    flex: 2;
    width: 90vw;
    max-width: 900px;
    height: 100vh;
    min-height: 400px;
    border: 1px solid #ccc;
    box-sizing: border-box;
    background: #fff;
}

.responsive-pdf-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

.news-list {
    flex: 1;
    min-width: 320px;
    max-width: 380px;
    border-radius: 12px;
    padding: 1.5rem;
    background: transparent;
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #f0f0f0;
    flex-shrink: 0;
}

.news-cards-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex: 1;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.news-cards-container::-webkit-scrollbar { width: 4px; }
.news-cards-container::-webkit-scrollbar-track { background: transparent; }
.news-cards-container::-webkit-scrollbar-thumb { background: #ddd; border-radius: 4px; }
.news-cards-container::-webkit-scrollbar-thumb:hover { background: #ccc; }

.news-card {
    display: block;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.news-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.news-card-image {
    width: 100%;
    height: 160px;
    overflow: hidden;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.news-card-content { padding: 0.75rem; }

.news-card-title {
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.3;
    color: #1a1a1a;
    margin-bottom: 0.35rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-date {
    font-size: 0.7rem;
    color: #999;
}

@media screen and (max-width: 900px) {
    .container-flex {
        flex-direction: column;
        gap: 20px;
    }

    .responsive-pdf-container {
        width: 98vw;
        height: 70vh;
        min-height: 300px;
    }

    .news-list {
        max-width: 100%;
        width: 100%;
        position: static;
    }

    .news-cards-container {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 12px;
        overflow-y: visible;
    }

    .news-card {
        flex: 1 1 45%;
        max-width: 48%;
    }
}

@media screen and (max-width: 600px) {
    .responsive-pdf-container {
        width: 98vw;
        height: 70vh;
        min-height: 300px;
    }

    .news-cards-container {
        flex-direction: column;
        gap: 10px;
    }

    .news-card { max-width: 100%; }
}