:root{--bg:#eef2f7;--panel:#fff;--ink:#172033;--muted:#64748b;--line:#dbe3ed;--blue:#2563eb;--editor:#0f172a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 Inter,system-ui,sans-serif}.app{max-width:1600px;margin:auto;padding:20px}.back{display:inline-block;margin-bottom:12px;color:var(--muted);font-size:13px;font-weight:650;text-decoration:none}.back:hover{color:var(--blue)}header,.panel{background:var(--panel);border:1px solid var(--line);border-radius:17px;box-shadow:0 8px 25px #0f172a10}header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:15px 18px;margin-bottom:17px}header h1{margin:0;font-size:21px}header p{margin:1px 0;color:var(--muted);font-size:13px}nav{display:flex;gap:8px;flex-wrap:wrap}button,.button{border:1px solid var(--line);border-radius:10px;background:#fff;padding:9px 13px;font-weight:750;cursor:pointer}.button input{display:none}.primary{background:var(--blue);border-color:var(--blue);color:#fff}.grid{display:grid;grid-template-columns:minmax(350px,1fr) minmax(500px,1fr);gap:17px}.panel{overflow:hidden}.panel-head{height:55px;padding:10px 14px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.panel-head input{width:55%;padding:7px 9px;border:1px solid var(--line);border-radius:8px}.panel-head small{color:var(--muted)}textarea{display:block;width:100%;min-height:78vh;resize:vertical;border:0;outline:0;padding:19px;background:var(--editor);color:#e2e8f0;font:13px/1.65 ui-monospace,monospace}
textarea.drag-over{box-shadow:inset 0 0 0 2px var(--blue)}.preview-shell{padding:22px;background:#cbd5e1;overflow:auto}#paper{width:794px;max-width:100%;min-height:1123px;margin:auto;padding:48px 54px;background:#fff;box-shadow:0 10px 30px #0f172a25;color:#1e293b}.meta{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);margin-bottom:28px;padding-bottom:9px;color:#94a3b8;font-size:10px;font-weight:800;letter-spacing:.13em;text-transform:uppercase}#paper h1{font-size:34px;line-height:1.15;margin:0 0 24px;color:#0f172a}#paper h2{font-size:23px;margin:30px 0 12px;padding-bottom:6px;border-bottom:1px solid #e2e8f0}#paper h3{font-size:18px;margin:22px 0 8px}#paper blockquote{margin:18px 0;padding:12px 15px;border-left:4px solid #14b8a6;background:#f0fdfa;border-radius:0 11px 11px 0}#paper code{padding:2px 5px;background:#f1f5f9;color:#be123c;border-radius:5px}#paper table{width:100%;border-collapse:collapse;margin:16px 0;font-size:13px}#paper th{padding:9px;background:#0f172a;color:#fff;text-align:left}#paper td{padding:9px;border-bottom:1px solid #e2e8f0}#paper ul,#paper ol{padding-left:24px}.diagram{margin:20px 0;padding:12px;border:1px solid var(--line);border-radius:14px;background:#f8fafc;overflow:auto;break-inside:avoid}.error{padding:13px;border-left:4px solid #dc2626;background:#fef2f2;color:#991b1b;white-space:pre-wrap}@media(max-width:1050px){.grid{grid-template-columns:1fr}header{align-items:flex-start;flex-direction:column}}@page{size:A4;margin:16mm 14mm 18mm}@media print{header,.editor-panel,.panel-head,.back{display:none!important}.app{max-width:none;margin:0;padding:0}.grid{display:block;gap:0}.panel{border:0;border-radius:0;box-shadow:none;background:#fff;overflow:visible}.preview-shell{padding:0;background:#fff;overflow:visible}#paper{width:100%;max-width:none;min-height:0;margin:0;padding:0;box-shadow:none}.diagram{overflow:visible}.diagram svg{max-height:235mm!important;width:auto!important;max-width:100%!important;height:auto!important;display:block;margin:0 auto}.diagram,table,blockquote{break-inside:avoid;page-break-inside:avoid}h1,h2,h3{break-after:avoid;page-break-after:avoid}}


/* Fenced Code Blocks: ```text, ```bash, ```json usw. */
.code-block{margin:18px 0;border:1px solid #26344b;border-radius:13px;overflow:hidden;background:#0f172a;break-inside:avoid}
.code-head{display:flex;align-items:center;justify-content:space-between;padding:7px 12px;background:#1e293b;color:#cbd5e1;font:700 11px/1.4 system-ui,sans-serif;letter-spacing:.08em;text-transform:uppercase}
.code-block pre{margin:0;padding:15px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;color:#e2e8f0;font:12.5px/1.6 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;tab-size:4}
#paper .code-block code.code-content{display:block;padding:0;border-radius:0;background:transparent;color:inherit;font:inherit;white-space:inherit}
@media print{.code-block{break-inside:avoid}.code-block pre{overflow:visible}.code-head{-webkit-print-color-adjust:exact;print-color-adjust:exact}.code-block{-webkit-print-color-adjust:exact;print-color-adjust:exact}}