:root{--bg:#f5f7fa;--surface:#fff;--surface2:#eef2f6;--text:#17202b;--muted:#687383;--line:#dfe5ec;--primary:#1769e0;--shadow:0 8px 24px rgba(25,38,52,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--text);letter-spacing:0}.sidebar{position:fixed;inset:0 auto 0 0;width:224px;background:#18212b;color:#dce4ec;padding:20px 12px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:11px;padding:3px 8px 22px}.brand-mark{display:grid;place-items:center;width:36px;height:36px;background:#ff6b57;color:#fff;font-weight:800;border-radius:7px}.brand strong,.brand small{display:block}.brand small{font-size:11px;color:#8fa0b2;margin-top:3px}nav{display:grid;gap:4px}.nav-item{border:0;background:transparent;color:#aebac7;text-decoration:none;display:grid;grid-template-columns:28px 1fr;align-items:center;text-align:left;min-height:42px;padding:0 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