:root{--ink:#e8eef3;--muted:#97a6b4;--bg:#101922;--panel:#18232e;--line:#2c3a48;--accent:#8df1ca;--blue:#85b6ff;--warm:#ffbc84}*{box-sizing:border-box}body{margin:0;font:15px/1.6 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--ink);background:var(--bg)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}header,footer{max-width:1320px;margin:auto;padding:26px 36px;display:flex;gap:20px;align-items:center;justify-content:space-between}header{border-bottom:1px solid var(--line)}.brand{font-size:21px;font-weight:700;display:flex;gap:12px;align-items:center;color:var(--ink)}.brand small{font-size:10px;letter-spacing:.18em;color:var(--muted);border-left:1px solid var(--line);padding-left:12px}.mark{display:grid;place-items:center;color:var(--bg);background:var(--accent);width:34px;height:34px;border-radius:9px;font-size:24px}main{max-width:1248px;margin:auto;padding:50px 36px}.intro{display:grid;grid-template-columns:1.1fr .9fr;gap:10px 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.practice{margin:18px 0 26px;padding:22px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.practice textarea{max-width:900px}.practice button{margin-top:4px}.region label{margin:16px 0 6px;color:var(--muted);font-size:11px}.region select{font-size:12px;padding:9px}

#practice-preview {white-space:pre-wrap;overflow-wrap:anywhere;max-height:360px;overflow:auto;background:var(--bg);padding:16px;font:14px/1.6 monospace;}