.activity-grid{display:grid;gap:16px}.activity-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow-sm)}.activity-card-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}.activity-card-head h2{margin:10px 0 4px}.activity-card-head p{margin:0;color:var(--muted)}.activity-value{min-width:110px;text-align:right;padding:12px;border-radius:12px;background:var(--soft)}.activity-value small,.activity-value span{display:block;color:var(--muted)}.activity-value strong{display:block;font-size:1.45rem}.activity-description{margin:16px 0;line-height:1.55}.activity-meta{display:flex;gap:10px 20px;flex-wrap:wrap;padding:12px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted)}.activity-card details{margin-top:12px;padding:10px 12px;border:1px solid var(--line);border-radius:10px}.activity-card details p{white-space:pre-wrap;line-height:1.5}.activity-card .row-actions{margin-top:15px}.activity-active{align-self:end;margin-bottom:10px}.activity-grade-table{margin-top:16px}.activity-grade-table table{min-width:900px}.activity-grade-table .grade-score{min-width:110px}.activity-grade-table .grade-comment{min-width:320px;min-height:72px}.activity-correction-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:14px}.activity-correction-summary>div{padding:14px;border-radius:12px;background:var(--soft)}.activity-correction-summary small,.activity-correction-summary b{display:block}.activity-correction-summary small{color:var(--muted);margin-bottom:5px}@media(max-width:800px){.activity-card-head{flex-direction:column}.activity-value{text-align:left;width:100%}.activity-correction-summary{grid-template-columns:1fr 1fr}}@media(max-width:520px){.activity-correction-summary{grid-template-columns:1fr}}