:root{--blue:#246bfd;--blue-dark:#184fc5;--ink:#14213d;--muted:#718096;--line:#e6eaf2;--bg:#f5f7fb;--card:#fff;--green:#14a673;--amber:#d88900;--red:#d84a4a;--radius:14px}*{box-sizing:border-box}body{margin:0;font:14px/1.55 Inter,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}a{color:var(--blue);text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:230px 1fr}.sidebar{position:sticky;top:0;height:100vh;background:#0f1d3a;color:#d8e2f8;padding:22px 14px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:18px;font-weight:700;padding:0 8px 18px}.brand-mark{display:grid;place-items:center;width:35px;height:35px;border-radius:10px;background:linear-gradient(135deg,#4f8cff,var(--blue));box-shadow:0 8px 24px #0a49d866}.mode{margin:0 8px 18px;padding:5px 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