body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: #f5f6f8;
}

.page-wrapper {
    padding: 24px;
}

.content-panel {
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 16px;
    min-width: 0;
}

.title {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 22px;
}

.info-box {
    background: #eef6ff;
    border: 1px solid #bdd7f0;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 16px;
    color: #1f4e79;
}

.warning-box {
    background: #fff5e5;
    border: 1px solid #ffd28a;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 16px;
    color: #8a5a00;
}

.file-preview-layout {
    display: grid;
    grid-template-columns: minmax(520px, 1fr) 430px;
    gap: 16px;
    align-items: stretch;
}

.file-manager-box {
    min-width: 0;
}

.preview-panel {
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #fafafa;
    display: flex;
    flex-direction: column;
    min-height: 650px;
    overflow: hidden;
}

.preview-header {
    padding: 12px;
    border-bottom: 1px solid #ddd;
    background: #f0f2f5;
    font-weight: 600;
    color: #333;
}

.preview-body {
    flex: 1;
    position: relative;
    background: white;
}

.preview-empty {
    padding: 20px;
    color: #777;
    font-size: 14px;
}

.preview-frame {
    width: 100%;
    height: 100%;
    border: 0;
    display: none;
}

.ws-topbar-title {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    color: var(--ws-blue-dark);
}

@media (max-width: 1200px) {
    .file-preview-layout {
        grid-template-columns: 1fr;
    }

    .preview-panel {
        min-height: 500px;
    }
}