:root{--primary:#007bff;--bg:#f0f2f5;--panel:#fff;--border:#d9dee5;--text:#212529;--muted:#6c757d}body{margin:0;padding:20px;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}.container{display:grid;grid-template-columns:360px 1fr;gap:20px;max-width:1200px;margin:0 auto}.left,.right{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}input,button{width:100%;box-sizing:border-box;padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--panel);color:var(--text);margin:10px 0}button{background:var(--primary);border:none;color:#fff;font-weight:600;cursor:pointer}#preview{display:none;max-width:100%;border-radius:10px;margin-top:10px}.meta-list{display:grid;gap:10px}.meta-item{display:grid;grid-template-columns:180px 1fr;gap:12px;padding:10px;border:1px solid var(--border);border-radius:8px;background:rgba(0,0,0,0.02)}.meta-item strong{word-break:break-word}.placeholder,.desc{color:var(--muted)}.dark-mode{--primary:#3d8bfd;--bg:#1e2128;--panel:#2a2e37;--border:#4a505f;--text:#e5e7eb;--muted:#9ca3af}.dark-mode .meta-item{background:rgba(255,255,255,0.03)}@media(max-width:900px){body{padding:10px}.container{grid-template-columns:1fr}.meta-item{grid-template-columns:1fr}}