:root{--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-danger:#dc2626;--color-success:#16a34a;--color-text:#1f2937;--color-text-secondary:#6b7280;--color-bg:#f3f4f6;--color-surface:#fff;--color-border:#e5e7eb;--touch-target:44px}*{box-sizing:border-box}body{color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:16px}h1{margin:0 0 .5rem;font-size:1.5rem}h3{margin:1.25rem 0 .5rem}.page{max-width:720px;margin:0 auto;padding:1rem}.page--center{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:1rem;min-height:80vh;display:flex}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;padding:1rem}.btn{min-height:var(--touch-target);border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;padding:.5rem 1rem;font-size:1rem;display:inline-flex}.btn:hover{background:var(--color-bg)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn--primary{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.btn--primary:hover{background:var(--color-primary-hover)}.btn--danger{border-color:var(--color-danger);color:var(--color-danger)}.btn--ghost{background:0 0;border-color:#0000}.btn--block{width:100%}.field{flex-direction:column;gap:.25rem;margin-bottom:1rem;display:flex}.field__label{color:var(--color-text-secondary);font-size:.9rem}.field input{min-height:var(--touch-target);border:1px solid var(--color-border);border-radius:8px;padding:.5rem .75rem;font-size:1rem}.field input:focus{outline:2px solid var(--color-primary);outline-offset:-1px}.field__error{color:var(--color-danger);font-size:.85rem}.form-error{color:var(--color-danger);align-items:center;gap:.75rem;margin:.5rem 0;display:flex}.form-actions{justify-content:flex-end;gap:.5rem;display:flex}.checkin-page__header{text-align:center;margin-bottom:1rem}.checkin-page__timer{color:var(--color-text-secondary);align-items:center;gap:.5rem;display:inline-flex}.countdown{font-variant-numeric:tabular-nums;color:var(--color-primary);font-size:1.25rem;font-weight:700}.checkin-form__title{text-align:center;margin:0 0 .25rem}.checkin-form__location{text-align:center;color:var(--color-text-secondary);margin:0 0 1rem}.checkin-result{flex-direction:column;align-items:center;gap:.5rem;padding:2rem 1rem;display:flex}.checkin-result__icon{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;font-size:2rem;display:flex}.checkin-result--success .checkin-result__icon{background:var(--color-success)}.checkin-result--error .checkin-result__icon{background:var(--color-danger)}.checkin-result__message{color:var(--color-text-secondary)}.qr-panel{text-align:center;flex-direction:column;align-items:center;gap:.75rem;display:flex}.qr-panel__img{border:1px solid var(--color-border);border-radius:8px}.qr-panel__url{word-break:break-all;color:var(--color-text-secondary);background:var(--color-bg);border-radius:6px;padding:.4rem .6rem;font-size:.85rem}.qr-panel__warning{color:#92400e;background:#fef3c7;border-radius:8px;padding:.6rem .8rem;font-size:.9rem}.qr-panel__hint{color:var(--color-text-secondary);font-size:.9rem}.admin-layout{min-height:100vh}.admin-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-wrap:wrap;align-items:center;gap:1rem;padding:.5rem 1rem;display:flex;position:sticky;top:0}.admin-header__title{font-weight:700}.admin-nav{flex:1;gap:.25rem;display:flex}.admin-nav a{min-height:var(--touch-target);color:var(--color-text-secondary);border-radius:8px;align-items:center;padding:0 .75rem;text-decoration:none;display:inline-flex}.admin-nav a.active,.admin-nav a:hover{color:var(--color-primary);background:var(--color-bg)}.admin-main{padding-top:1.5rem}.list-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:1rem;display:flex}.activity-list{flex-direction:column;gap:.75rem;margin:0;padding:0;list-style:none;display:flex}.activity-item__main{width:100%;font:inherit;cursor:pointer;text-align:left;background:0 0;border:none;flex-direction:column;align-items:flex-start;gap:.25rem;padding:.25rem;display:flex}.activity-item__name{font-weight:600}.activity-item__meta{color:var(--color-text-secondary);font-size:.9rem}.activity-detail__meta{color:var(--color-text-secondary);margin:0}.activity-detail__actions{flex-wrap:wrap;gap:.5rem;display:flex}.empty-state{text-align:center;color:var(--color-text-secondary);flex-direction:column;align-items:center;gap:1rem;padding:2rem 0;display:flex}.tabs{border-bottom:1px solid var(--color-border);gap:.25rem;margin-bottom:1rem;display:flex}.tabs__item{min-height:var(--touch-target);color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;padding:0 1rem;font-size:1rem}.tabs__item--active{color:var(--color-primary);border-bottom-color:var(--color-primary);font-weight:600}.tab-panel{min-height:300px}.data-table{border-collapse:collapse;width:100%;font-size:.95rem}.data-table th{text-align:left;color:var(--color-text-secondary);border-bottom:1px solid var(--color-border);padding:.5rem;font-weight:500}.data-table td{border-bottom:1px solid var(--color-border);padding:.5rem}.data-table__num{font-variant-numeric:tabular-nums}.checkin-list__toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;margin-bottom:.75rem;display:flex}.checkin-list__toolbar input{min-height:var(--touch-target);border:1px solid var(--color-border);border-radius:8px;padding:.5rem .75rem;font-size:1rem}.viz-root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--surface-1:#fcfcfb;--text-primary:#0b0b0b;--text-secondary:#52514e;--series-1:#2a78d6;--baseline:#c3c2b7}@media (prefers-color-scheme:dark){.viz-root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--surface-1:#1a1a19;--text-primary:#fff;--text-secondary:#c3c2b7;--series-1:#3987e5;--baseline:#383835}}.stat-tiles{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.75rem;display:grid}.stat-tile{background:var(--surface-1);border-radius:10px;flex-direction:column;gap:.25rem;padding:1rem;display:flex}.stat-tile__label{color:var(--text-secondary);font-size:.85rem}.stat-tile__value{color:var(--text-primary);font-size:1.75rem;font-weight:700}.stats-panel__heading{color:var(--text-primary)}.hourly-chart{background:var(--surface-1);border-bottom:2px solid var(--baseline);border-radius:10px;align-items:flex-end;gap:2px;height:160px;padding:.75rem .5rem .5rem;display:flex}.hourly-chart__col{flex-direction:column;flex:1;justify-content:flex-end;align-items:center;gap:.25rem;min-width:0;height:100%;display:flex}.hourly-chart__bar{background:var(--series-1);border-radius:2px 2px 0 0;width:100%;min-height:2px;transition:height 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