:root{--blue:#315ff2;--ink:#172033;--muted:#667085;--line:#e4e8ef;--surface:#fff;--sidebar:#f7f8fb;--success:#087f5b;--warning:#a16207;--danger:#b42318}*{box-sizing:border-box}body{margin:0;background:#fbfcfe;color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif;font-size:14px}.admin-shell{display:flex;min-height:100vh}.admin-side{width:238px;background:var(--sidebar);border-right:1px solid var(--line);padding:24px 16px 18px;display:flex;flex-direction:column}.admin-brand{display:flex;align-items:center;gap:9px;color:var(--ink);text-decoration:none;padding:2px 8px 28px}.admin-brand img{width:31px;height:43px;object-fit:contain}.admin-brand b{display:block;font-size:17px;letter-spacing:.01em}.admin-brand small{display:block;margin-top:3px;font-size:11px;color:var(--muted)}nav{display:grid;gap:4px}.nav-item{border:0;background:transparent;color:#526078;text-align:left;padding:11px 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