:root{--bg: #0b1020;--panel: #121a2b;--border: #243047;--text: #e6edf7;--muted: #9fb0cc;--accent: #4f8cff}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji"}button,input,select,textarea{font:inherit;color:inherit}.app{display:flex;flex-direction:column;height:100%}.header{display:flex;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--border);background:var(--panel)}.title{font-weight:600}.spacer{flex:1}.btn{background:var(--accent);color:#fff;border:none;padding:12px 16px;border-radius:10px;cursor:pointer}.btn.secondary{background:#1f2a40;color:var(--text);border:1px solid var(--border)}.btn:disabled{opacity:.6;cursor:not-allowed}.select,input[type=text]{background:#0f1628;border:1px solid var(--border);padding:8px;border-radius:8px}.content{flex:1;display:flex;flex-direction:column;min-height:0}.editor{flex:1;min-height:0;padding:12px;display:flex}.editor textarea{flex:1;width:100%;height:100%;min-height:0;resize:none;overflow:auto;background:#0a1222;color:var(--text);border:1px solid var(--border);border-radius:12px;padding:16px}.preview{background:#fff;color:#0b1020;border-radius:12px;padding:24px;min-height:200px;max-width:100%;box-shadow:0 0 0 1px #e5eaf3}.preview.export{width:var(--export-width)}.offscreen{position:fixed;left:-10000px;top:-10000px;pointer-events:none}.preview h1,.preview h2,.preview h3{margin:16px 0 8px}.preview pre{background:#0f1628;color:#e6edf7;padding:12px;border-radius:8px;overflow:auto}.preview code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}.preview blockquote{border-left:4px solid #dde3ee;margin:8px 0;padding:8px 12px;background:#f7f9fc}.preview table{border-collapse:collapse}.preview td,.preview th{border:1px solid #dde3ee;padding:6px 8px}.footer{position:fixed;bottom:0;left:0;right:0;padding:10px 14px;display:flex;gap:8px;align-items:center;justify-content:center}.viewerWrap{flex:1;display:flex;align-items:center;justify-content:center;padding:12px}.viewerImage{max-width:100%;height:auto;border-radius:12px;background:#fff;box-shadow:0 0 0 1px #e5eaf3}.filename{width:200px}