:root{--bg:#f5f7fb;--panel:#fff;--text:#172033;--muted:#6b7280;--line:#e5e9f0;--nav:#0d1b2a;--primary:#1769e0;--soft:#eef5ff;--green:#087f5b;--red:#c24141;--shadow:0 12px 34px #17203312}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text);margin:0;padding:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans KR,sans-serif}button,input,select,textarea{font:inherit}button{cursor:pointer}code{background:#eef2f7;border-radius:6px;padding:2px 5px}.login-shell{background:radial-gradient(circle at 20% 10%,#e9f4ff,transparent 36%),var(--bg);place-items:center;min-height:100vh;padding:20px;display:grid}.login-card{border:1px solid var(--line);width:min(430px,100%);box-shadow:var(--shadow);text-align:center;background:#fff;border-radius:24px;padding:32px}.brand-mark{color:#fff;background:linear-gradient(135deg,#1769e0,#53b7ff);border-radius:16px;place-items:center;width:52px;height:52px;margin:auto;font-size:24px;font-weight:900;display:grid}.brand-mark.small{border-radius:10px;width:34px;height:34px;margin:0;font-size:16px}.login-card h1{margin:14px 0 4px}.muted{color:var(--muted)}.fine{color:var(--muted);margin-top:16px;font-size:12px;line-height:1.55}.notice{text-align:left;background:#fff7ed;border:1px solid #fed7aa;border-radius:10px;padding:10px;font-size:13px}.app-shell{grid-template-columns:236px 1fr;min-height:100vh;display:grid}.sidebar{background:var(--nav);color:#fff;height:100vh;padding:20px 14px;position:sticky;top:0}.brand{align-items:center;gap:10px;margin:0 6px 24px;font-size:19px;font-weight:850;display:flex}.sidebar nav{gap:6px;display:grid}.nav{color:#c9d3df;text-align:left;background:0 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