:root{--ink:#26333b;--muted:#7c8b91;--line:#e5ebeb;--bg:#f4f7f7;--teal:#16a89a;--teal-dark:#087f78;--nav:#20343b;--danger:#c84f4f}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:13px/1.45 "Microsoft YaHei",Arial,sans-serif}.app-shell{display:flex;min-height:100vh}.sidebar{background:var(--nav);color:#d5e2e3;width:176px;flex:none;display:flex;flex-direction:column}.brand{height:50px;display:flex;align-items:center;gap:8px;padding:0 15px;font-size:14px;font-weight:700;letter-spacing:.03em}.brand-mark{display:grid;place-items:center;width:22px;height:22px;color:#fff;background:var(--teal);border-radius:4px;font-size:13px}.nav-list{padding:10px 8px}.nav-item{border:0;background:none;color:#aebfc1;width:100%;text-align:left;padding:7px 10px;margin:1px 0;border-radius:3px;font:inherit;font-size:13px;cursor:pointer}.nav-item:hover,.nav-item.active{background:#2c4c51;color:#fff}.nav-item.active{box-shadow:inset 3px 0 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