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/* v2: real-render thumbnails, editor feature section, back-to-top */
.thumb-page{display:block;position:relative;width:190px;aspect-ratio:210/297;overflow:hidden;background:#fff;box-shadow:0 8px 15px #314b3b14;flex:none}
.thumb-page .lr-page{position:absolute;left:0;top:0;transform-origin:0 0;pointer-events:none}
#large-preview .thumb-page{width:270px}
.editor-feature{padding:85px 0;border-top:1px solid var(--line)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden;margin-bottom:32px}
.feature-grid article{background:var(--bg);padding:28px 26px}
.feature-grid svg{width:22px;height:22px;fill:none;stroke:#6f8a5a;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.feature-grid h3{font-size:16px;font-weight:500;margin:16px 0 8px}
.feature-grid p{font-size:12px;color:var(--muted);margin:0}
.to-top{position:fixed;right:24px;bottom:96px;z-index:30;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:#fffffff0;color:var(--ink);display:flex;align-items:center;justify-content:center;box-shadow:0 6px 20px #24382f1c;opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .2s,transform .2s}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.to-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
@media(max-width:1000px){.feature-grid{grid-template-columns:1fr 1fr}}
@media(max-width:720px){.thumb-page{width:146px}.editor-feature{padding:55px 0}.feature-grid{grid-template-columns:1fr}.feature-grid article{padding:22px}.to-top{right:16px;bottom:84px}}