:root{--bg:#f4f6f9;--panel:#fff;--text:#172033;--muted:#7b8496;--line:#e6e9ef;--primary:#2f6fed;--green:#12a66a;--dark:#111827;--danger:#d94b4b;--shadow:0 10px 30px rgba(26,36,61,.08)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh;display:flex}.sidebar{width:238px;background:var(--dark);color:#fff;padding:22px 16px;display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0}.brand{display:flex;gap:12px;align-items:center;padding:0 8px 22px}.logo{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,#75a6ff,#2f6fed);display:grid;place-items:center;font-weight:800;font-size:21px}.brand strong,.brand span{display:block}.brand span{font-size:12px;color:#9da7b8;margin-top:3px}nav{display:flex;flex-direction:column;gap:6px}.nav-item{border:0;background:transparent;color:#b8c0ce;text-align:left;padding:12px 14px;border-radius:10px;cursor:pointer}.nav-item:hover,.nav-item.active{background:#243047;color:#fff}.sidebar-footer{margin-top:auto;font-size:12px;color:#9da7b8;display:flex;align-items:center;gap:8px;padding:8px}.status-dot{width:8px;height:8px;background:#25d17c;border-radius:50%;box-shadow:0 0 0 4px rgba(37,209,124,.12)}.main{margin-left:238px;width:calc(100% - 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