.ptv-layout {
    --ptv-text: #262626;
    --ptv-text-muted: #9a9a9a;
    --ptv-border: #e8e8e8;
    --ptv-accent: #000;

    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 56px;
    width: 100%;
    margin: 32px 0;
    font-family: inherit;
}

/* ── Navigation ── */
.ptv-layout .ptv-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: sticky;
    top: 24px;
    align-self: start;
}

.ptv-layout button.ptv-nav-btn {
    background: none;
    border: none;
    display: flex;
    padding: 0;
    text-align: left;
    cursor: pointer;
    font: inherit;
    font-size: 14px;
    letter-spacing: 0.02em;
    color: var(--ptv-text-muted);
    transition: color .25s ease, border-color .25s ease, padding-left .25s ease;
    box-shadow: none;
    outline: none;
    position: relative;
    align-items: center;
}

.ptv-layout button.ptv-nav-btn:focus,
.ptv-layout button.ptv-nav-btn:focus-visible,
.ptv-layout button.ptv-nav-btn:active {
    box-shadow: none;
    outline: none;
}

.ptv-layout button.ptv-nav-btn.active {
    color: var(--ptv-text);
    font-weight: 500;
}
.ptv-layout button.ptv-nav-btn:before {
    content: "";
    margin-right: 10px;
    height: 15px;
    width: 1px;
    background: #000;
    display: inline-block;
    opacity: 0;
}

.ptv-layout button.ptv-nav-btn.active:before {
    opacity: 1;
}

/* ── Viewer ── */
.ptv-viewer {
    min-width: 0; /* allow shrinking inside grid */
}

.ptv-panel {
    display: none;
    animation: ptv-fade-in .35s ease;
}
.ptv-panel.active { display: block; }

@keyframes ptv-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.ptv-panel .wp-block-pdfemb-pdf-embedder-viewer,
.ptv-panel iframe,
.ptv-panel canvas {
    border-radius: 4px;
    overflow: hidden;
}

/* ── Loading state ── */
.ptv-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 60vh;
    min-height: 320px;
    color: var(--ptv-text-muted);
    font-size: 13px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    gap: 16px;
    border: 1px solid var(--ptv-border);
    border-radius: 4px;
    background: #fafafa;
}

.ptv-spinner {
    width: 22px;
    height: 22px;
    border: 2px solid var(--ptv-border);
    border-top-color: var(--ptv-text);
    border-radius: 50%;
    animation: ptv-spin .8s linear infinite;
}
@keyframes ptv-spin { to { transform: rotate(360deg); } }

/* ── Error state ── */
.ptv-panel p {
    padding: 16px 20px;
    margin: 0;
    font-size: 14px;
    color: var(--ptv-text-muted);
    border: 1px solid var(--ptv-border);
    border-radius: 4px;
    background: #fafafa;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .ptv-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .ptv-layout .ptv-nav {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        padding-bottom: 8px;
        border-bottom: 1px solid var(--ptv-border);
    }

    .ptv-layout button.ptv-nav-btn {
        border-left: none;
        border-radius: 999px;
        padding: 6px 16px;
        background: #f5f5f5;
        color: var(--ptv-text-muted);
        font-size: 13px;
    }

    .ptv-layout button.ptv-nav-btn:hover {
        padding-left: 16px;
        background: #ececec;
    }

    .ptv-layout button.ptv-nav-btn.active {
        background: var(--ptv-accent);
        color: #fff;
        padding-left: 16px;
        border-left: none;
    }

    .ptv-loading { height: 50vh; min-height: 240px; }
}