:root{--primary:#f07000;--primary-dark:#c85c00;--notice:#0080d0;--attendance:#00a040;--reservation:#f05080;--danger:#d93025;--bg:#f7f7f8;--surface:#fff;--border:#e3e5ea;--text:#1f2329;--text-muted:#6b7280;--radius:8px;--shadow:0 1px 3px #0000000f}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;font-size:15px;line-height:1.6}a{color:var(--notice);text-decoration:none}a:hover{text-decoration:underline}.app-shell{min-height:100vh;display:flex}.sidebar{background:var(--surface);border-right:1px solid var(--border);flex-shrink:0;width:220px;padding:16px 12px}.sidebar__brand{color:var(--primary);padding:4px 8px 16px;font-size:1.05rem;font-weight:700}.sidebar__nav{flex-direction:column;gap:2px;display:flex}.sidebar__link{border-radius:var(--radius);color:var(--text);justify-content:space-between;align-items:center;gap:8px;padding:8px 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