/* Preview — Academic paper rendering */
.latex-page {
    max-width: 780px; margin: 20px auto; padding: 52px 60px;
    background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.06);
    font-family: var(--font-serif); font-size: 14px; line-height: 1.9; color: var(--gray-800);
    border: 1px solid var(--gray-200); border-radius: var(--radius);
}
@media (max-width: 900px) { .latex-page { padding: 24px 20px; margin: 8px; } }

.latex-section { margin-top: 28px; margin-bottom: 10px; }
.latex-section-lv2 { font-size: 19px; font-weight: 700; color: var(--gray-900); }
.latex-section-lv3 { font-size: 16px; font-weight: 600; color: var(--gray-800); }
.latex-section-lv4 { font-size: 14px; font-weight: 600; color: var(--gray-700); }
.latex-section-number { color: var(--accent); margin-right: 6px; }
.latex-para { margin: 6px 0; text-indent: 2em; }

.latex-inline-math { font-style: italic; }
.latex-display-math { display: flex; align-items: center; justify-content: center; margin: 14px 0; padding: 8px 0; position: relative; }
.latex-equation-number { position: absolute; right: 0; font-size: 13px; color: var(--gray-500); }
.latex-math-unicode { font-family: var(--font-mono); font-size: 13px; }
.latex-math-raw { font-family: var(--font-mono); font-size: 12px; color: var(--error); background: #fef2f2; padding: 2px 6px; border-radius: 2px; }

.latex-figure, .latex-table.latex-float { margin: 18px auto; text-align: center; }
.latex-caption { font-size: 12px; color: var(--gray-500); margin-top: 6px; }

.latex-table { border-collapse: collapse; margin: 14px auto; font-size: 13px; }
.latex-table td, .latex-table th { border: 1px solid var(--gray-300); padding: 5px 10px; text-align: left; }
.latex-table th { background: var(--gray-100); font-weight: 600; }

.latex-list { margin: 8px 0; padding-left: 26px; }
.latex-list-item { margin: 3px 0; }

.latex-bibliography { margin-top: 28px; border-top: 1px solid var(--gray-200); padding-top: 14px; }
.latex-bibitem { margin: 4px 0; font-size: 12px; padding-left: 18px; text-indent: -18px; }
.latex-bibitem-marker { font-weight: 600; color: var(--accent); }

.latex-ref { color: var(--accent); cursor: pointer; }
.latex-ref-unresolved { color: var(--error); text-decoration: underline wavy; }
.latex-cite { color: var(--accent); font-size: 12px; }

.latex-env { margin: 14px 0; }
.latex-env-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--gray-800); }
.latex-theorem { font-style: italic; margin: 12px 0; padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--accent-subtle); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.latex-theorem-head { font-style: normal; font-weight: 600; }
.latex-tcolorbox { border: 1px solid var(--gray-200); border-radius: var(--radius-sm); padding: 12px; margin: 12px 0; }
.latex-tcolorbox-title { font-weight: 600; margin-bottom: 6px; }
.latex-verbatim { font-family: var(--font-mono); font-size: 12px; background: var(--gray-100); padding: 12px; border-radius: var(--radius-sm); overflow-x: auto; white-space: pre-wrap; border: 1px solid var(--gray-200); }

.latex-image-container { margin: 14px auto; text-align: center; }
.latex-image-placeholder { display: inline-flex; align-items: center; justify-content: center; min-width: 200px; min-height: 100px; background: var(--gray-100); border: 1px dashed var(--gray-300); border-radius: var(--radius-sm); color: var(--gray-500); font-size: 12px; }

.latex-error { color: var(--error); padding: 14px; background: #fef2f2; border-radius: var(--radius); border: 1px solid #fecaca; margin: 16px; }
.preview-spacer { pointer-events: none; }

/* PDF preview iframe */
.pdf-preview-iframe {
    width: 100%; height: 100%; border: none;
    border-radius: var(--radius);
    background: #fff;
}