:root{--navy:#13263d;--navy2:#0d1c2d;--blue:#1e73be;--pale:#eef5f9;--line:#dce5eb;--ink:#1c2b3a;--muted:#70808e;--white:#fff;--green:#20a36a}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:"Yu Gothic UI","Meiryo",sans-serif;color:var(--ink);background:#f5f7f8}body{font-size:14px}.app-shell{display:grid;grid-template-columns:238px 1fr;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:238px;background:linear-gradient(180deg,var(--navy),var(--navy2));color:#fff;padding:30px 18px;display:flex;flex-direction:column}.brand{display:grid;grid-template-columns:47px 1fr;grid-template-rows:25px 20px;gap:0 12px;color:#fff;text-decoration:none;padding:0 8px 30px;border-bottom:1px solid #ffffff1f}.brand span{grid-row:1/3;background:#fff;color:var(--navy);font:800 27px/47px Arial;text-align:center;border-radius:8px}.brand strong{font-size:18px;letter-spacing:.08em}.brand small{color:#9eb4c8}.sidebar nav{margin-top:25px;display:grid;gap:6px}.sidebar nav 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