.preview-shell {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.preview-hero {
    background: linear-gradient(135deg, #e3f3ff 0%, #fdfbff 60%);
    padding: 2rem;
    border-radius: 28px;
    box-shadow: 0 24px 40px rgba(15, 23, 42, 0.08);
}

.preview-hero h1 {
    margin: 0.5rem 0 0;
    font-size: clamp(2.2rem, 4vw, 3rem);
    color: #0f172a;
}

.preview-hero p {
    color: #475569;
    margin: 0.5rem 0 0;
}

.preview-panel {
    background: #ffffff;
    border-radius: 28px;
    box-shadow: 0 20px 35px rgba(15, 23, 42, 0.12);
    border: 1px solid rgba(15, 23, 42, 0.05);
    overflow: hidden;
}

.preview-toolbar {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: #f8fafc;
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.toolbar-group label {
    display: flex;
    flex-direction: column;
    font-size: 0.85rem;
    gap: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748b;
}

.toolbar-group select {
    min-width: 220px;
    padding: 0.4rem 0.6rem;
    border-radius: 8px;
    border: 1px solid rgba(15, 23, 42, 0.15);
    background: #fff;
    color: #0f172a;
}

.nav-buttons button,
.toolbar-actions button {
    border: none;
    background: rgba(10, 160, 210, 0.12);
    color: #0aa0d2;
    padding: 0.5rem 0.9rem;
    border-radius: 999px;
    font-weight: 600;
    cursor: pointer;
    transition:
        background 0.15s ease,
        transform 0.15s ease;
}

.nav-buttons button:hover,
.toolbar-actions button:hover {
    background: rgba(99, 102, 241, 0.5);
    transform: translateY(-1px);
}

.mode-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: #0f172a;
}

.mode-toggle input {
    width: 1rem;
    height: 1rem;
}

.preview-main {
    padding: 1.5rem;
    display: grid;
    gap: 1.5rem;
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
}

.preview-meta {
    padding: 1.25rem;
    border-radius: 20px;
    background: #f8fafc;
    border: 1px solid rgba(15, 23, 42, 0.08);
}

.preview-meta h2 {
    margin: 0 0 0.35rem;
    font-size: 1.5rem;
    color: #0f172a;
}

.preview-meta p {
    margin: 0.35rem 0;
    color: #475569;
    line-height: 1.5;
}

.preview-date {
    font-size: 0.9rem;
    color: #94a3b8;
}

.preview-meta a {
    color: #0aa0d2;
    text-decoration: none;
}

.preview-note {
    font-style: italic;
    color: #94a3b8;
}

.preview-stage {
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid rgba(15, 23, 42, 0.08);
    background: #0f172a;
}

#previewFrame {
    width: 100%;
    min-height: 70vh;
    border: none;
    display: block;
    background: #fff;
}

.preview-status {
    text-align: center;
    color: #475569;
    font-size: 0.95rem;
    min-height: 1.5rem;
    padding-bottom: 1rem;
}

@media (max-width: 960px) {
    .preview-main {
        grid-template-columns: 100%;
    }
}