.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--content-bg, #fff);
    overflow: hidden;
}

.content-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color, #ddd);
    background-color: var(--content-header-bg, #fff);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.content-header h2 {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary, #333);
}

.content-body {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

.content-section {
    max-width: 1200px;
}

.content-section h3 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary, #333);
}

.content-section p {
    margin: 0 0 16px 0;
    font-size: 14px;
    color: var(--text-secondary, #666);
    line-height: 1.6;
}

.placeholder {
    padding: 48px;
    border: 2px dashed var(--border-color, #ddd);
    border-radius: 8px;
    text-align: center;
    background-color: var(--placeholder-bg, #f9f9f9);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder span {
    font-size: 16px;
    color: var(--text-secondary, #999);
    font-weight: 600;
}

/* Scrollbar styling */
.content-body::-webkit-scrollbar {
    width: 8px;
}

.content-body::-webkit-scrollbar-track {
    background: transparent;
}

.content-body::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb, #ccc);
    border-radius: 4px;
}

.content-body::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover, #999);
}

@media (max-width: 768px) {
    .content-header {
        padding: 16px 20px;
    }

    .content-header h2 {
        font-size: 22px;
    }

    .content-body {
        padding: 20px;
    }

    .placeholder {
        padding: 32px 20px;
        min-height: 150px;
    }

    .placeholder span {
        font-size: 14px;
    }
}