:root{--bg: #f4f6fb;--panel: #ffffff;--line: #e4e8f0;--text: #1a1f2b;--muted: #6b7488;--accent: #2f6bff;--accent-weak: #eaf0ff;--ok: #1a9d5a;--warn: #d98a00;--danger: #d7263d;--radius: 12px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,Segoe UI,system-ui,sans-serif;font-size:14px}a{color:var(--accent);text-decoration:none}.layout{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:18px 12px}.brand{font-weight:800;font-size:18px;padding:6px 10px 18px}.nav a{display:block;padding:10px 12px;border-radius:10px;color:var(--text);margin-bottom:2px}.nav a.active,.nav a:hover{background:var(--accent-weak);color:var(--accent)}.main{padding:24px 28px;max-width:1100px}h1{font-size:22px;margin:0 0 18px}h2{font-size:16px;margin:22px 0 12px}.panel{background:var(--panel);border:1px solid 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