.two-col {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.25rem;
    align-items: start;
}

@media (max-width: 820px) {
    .two-col {
        grid-template-columns: 1fr;
    }
}

.preview-card {
    min-width: 0;
    overflow: hidden;
}

.preview-canvas-wrap {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    min-height: 300px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.preview-canvas-wrap canvas {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 2px;
}

.thumb-strip {
    display: flex;
    gap: 0.4rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.5rem 0 0.4rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
}

.thumb-strip::-webkit-scrollbar {
    height: 4px;
}

.thumb-strip::-webkit-scrollbar-thumb {
    background: var(--border2);
    border-radius: 2px;
}

.thumb-frame {
    flex-shrink: 0;
    width: 52px;
    height: 68px;
    border: 2px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    transition: border-color var(--transition);
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.thumb-frame:hover {
    border-color: var(--accent2);
}

.thumb-frame.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-bg);
}

.thumb-frame canvas {
    display: block;
    width: 100% !important;
    height: auto !important;
}

.page-nav-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-nav-btn {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text2);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.page-nav-btn:hover:not(:disabled) {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.page-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.page-nav-label {
    flex: 1;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text2);
}

.file-pill {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    color: var(--text2);
    margin-bottom: 1rem;
    word-break: break-all;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 1rem 0;
}

.preview-page-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    pointer-events: none;
    z-index: 2;
}