:root{--color-bg:#f7f7fa;--color-surface:#fff;--color-border:#e0e0e6;--color-text:#1b1b23;--color-muted:#6b6b76;--color-primary:#3f51b5;--color-primary-dark:#303f9f;--color-success:#2e7d32;--color-warning:#b26a00;--color-danger:#c62828;--radius:8px;--space-1:4px;--space-2:8px;--space-3:16px;--space-4:24px;--space-5:32px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{background:var(--color-bg);color:var(--color-text);margin:0;line-height:1.5}a{color:var(--color-primary)}h1,h2,h3{line-height:1.2}.app-shell{flex-direction:column;min-height:100vh;display:flex}.uat-banner{background:var(--color-warning);color:#fff;text-align:center;padding:var(--space-2) var(--space-3);letter-spacing:.02em;font-size:.85rem;font-weight:600}.navbar{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-3) 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var(--color-primary);outline-offset:1px}.checkbox-row{flex-direction:row;align-items:center}table{border-collapse:collapse;width:100%;font-size:.9rem}th,td{text-align:left;padding:var(--space-2) var(--space-3);border-bottom:1px solid var(--color-border)}.table-wrap{overflow-x:auto}.badge{border-radius:999px;padding:2px 10px;font-size:.75rem;font-weight:600;display:inline-block}.badge-open,.badge-confirmed,.badge-present{color:var(--color-success);background:#e6f4ea}.badge-full,.badge-waitlisted,.badge-late{color:var(--color-warning);background:#fff3e0}.badge-cancelled,.badge-absent{color:var(--color-danger);background:#fdecea}.badge-draft,.badge-inactive{color:var(--color-muted);background:#eceff1}.badge-online{color:var(--color-primary-dark);background:#e8eaf6}.badge-in-person{color:var(--color-text);background:#eceff1}.alert{padding:var(--space-3);border-radius:var(--radius);margin-bottom:var(--space-3)}.alert-error{color:var(--color-danger);background:#fdecea;border:1px solid #f5c6cb}.alert-success{color:var(--color-success);background:#e6f4ea;border:1px solid #b7dfc0}.muted{color:var(--color-muted);font-size:.9rem}.stack{gap:var(--space-2);flex-direction:column;display:flex}.row{gap:var(--space-2);flex-wrap:wrap;align-items:center;display:flex}.page-header{justify-content:space-between;align-items:center;gap:var(--space-2);margin-bottom:var(--space-4);flex-wrap:wrap;display:flex}.tabs{gap:var(--space-2);border-bottom:1px solid var(--color-border);margin-bottom:var(--space-4);display:flex;overflow-x:auto}.tabs a{padding:var(--space-2) var(--space-3);color:var(--color-muted);white-space:nowrap;border-bottom:2px solid #0000;text-decoration:none}.tabs a.active{color:var(--color-primary);border-bottom-color:var(--color-primary);font-weight:600}@media (width<=640px){.main-content{padding:var(--space-3)}.navbar{padding:var(--space-2) var(--space-3)}form{max-width:100%}}:root{--bp-stack:900px}@media (width<=900px){.table-wrap table,.table-wrap tbody,.table-wrap tr,.table-wrap td{width:100%;display:block}.table-wrap thead{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.table-wrap tbody tr{border:1px solid var(--color-border);border-radius:var(--radius);padding:var(--space-3);margin-bottom:var(--space-3);background:var(--color-surface)}.table-wrap tbody tr:last-child{margin-bottom:0}.table-wrap td{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-1) 0;border-bottom:1px solid var(--color-border);text-align:right;display:flex}.table-wrap td:last-child{border-bottom:none}.table-wrap td:before{content:attr(data-label);color:var(--color-muted);text-align:left;flex-shrink:0;font-size:.78rem;font-weight:600}.table-wrap td:first-child{font-size:1rem;font-weight:600}.table-wrap td.cell-stack{text-align:left;flex-direction:column;align-items:stretch}.table-wrap td.cell-stack:before{margin-bottom:var(--space-1)}.attendance-actions{gap:var(--space-2);grid-template-columns:1fr 1fr;display:grid}.attendance-actions .btn{width:100%}.attendance-actions>.muted{grid-column:1/-1}.admin-nav-summary{justify-content:space-between;align-items:center;gap:var(--space-2);padding:10px var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);cursor:pointer;margin-bottom:var(--space-3);font-weight:600;list-style:none;display:flex}.admin-nav-summary::-webkit-details-marker{display:none}.admin-nav .tabs{margin-bottom:var(--space-3);border-bottom:none;flex-direction:column;align-items:stretch;overflow-x:visible}.admin-nav .tabs a{padding:10px var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius);border-bottom:1px solid var(--color-border)}.admin-nav:not([open]) 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