:root{--blue:#2563eb;--blue-dark:#1d4ed8;--bg:#f5f7fb;--text:#172033;--muted:#7a8599;--line:#e7ebf2;--green:#0f9f6e}*{box-sizing:border-box}html,body{min-height:100%;color:var(--text);background:#dfe5ef;margin:0;font-family:Arial,Noto Sans KR,sans-serif}button{font:inherit}.app-shell{background:var(--bg);width:min(100%,480px);min-height:100vh;margin:0 auto;padding-bottom:84px;position:relative;box-shadow:0 0 30px #1f293714}.topbar{border-bottom:1px solid var(--line);z-index:10;background:#fff;align-items:center;height:76px;padding:18px 20px;display:flex;position:sticky;top:0}.topbar>div{flex-direction:column;gap:4px;display:flex}.topbar strong{letter-spacing:-.6px;font-size:20px}.topbar span{color:var(--muted);font-size:12px}.detail-topbar{gap:10px}.icon-button{background:0 0;border:0;place-items:center;width:38px;height:38px;padding:0;display:grid}.content{padding:20px 16px 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