.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0;
}

.activities-filter-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1.5rem;
    background: white;
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-left {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    flex: 1;
}

.filter-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-item label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-item select,
.filter-item input {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    min-width: 180px;
    background: white;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.filter-item select:focus,
.filter-item input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.filter-item.search-item {
    flex: 1;
    min-width: 200px;
}

.filter-item.search-item input {
    width: 100%;
    min-width: unset;
}

.filter-right {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.btn-search,
.btn-reset {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    border: none;
}

.btn-search {
    background: var(--accent-blue);
    color: white;
}

.btn-search:hover {
    background: #2563EB;
}

.btn-reset {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-reset:hover {
    background: #E5E7EB;
}

@media (max-width: 768px) {
    .activities-filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-left {
        flex-direction: column;
        gap: 1rem;
    }
    
    .filter-item select,
    .filter-item input {
        min-width: 100%;
    }
    
    .filter-right {
        justify-content: flex-end;
    }
}

.loading-placeholder {
    grid-column: 1/-1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.loading-placeholder i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-blue);
}

.error-message {
    grid-column: 1/-1;
    text-align: center;
    padding: 3rem;
    color: #EF4444;
}

.error-message i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.empty-state {
    grid-column: 1/-1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #D1D5DB;
}

.empty-state p {
    margin: 0.5rem 0;
}

.activity-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.activity-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.activity-cover {
    height: 160px;
    background: linear-gradient(135deg, var(--accent-blue), #667eea);
    position: relative;
    overflow: hidden;
}

.activity-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.activity-cover .status-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: white;
}

.status-badge.draft { background: #9CA3AF; }
.status-badge.published { background: #10B981; }
.status-badge.ongoing { background: #3B82F6; }
.status-badge.ended { background: #6B7280; }

.activity-info {
    padding: 1rem;
}

.activity-info h3 {
    font-size: 1.1rem;
    margin: 0 0 0.5rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.activity-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.activity-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.activity-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.activity-stats .stat {
    text-align: center;
}

.activity-stats .stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-blue);
}

.activity-stats .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.activity-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
}

.activity-actions .btn-small {
    flex: 1;
    padding: 6px 10px;
    font-size: 12px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: all 0.2s;
}

.btn-small.btn-edit {
    background: var(--accent-blue);
    color: white;
}

.btn-small.btn-view {
    background: #6B7280;
    color: white;
}

.btn-small.btn-registrations {
    background: #10B981;
    color: white;
}

.btn-small.btn-summary {
    background: #F59E0B;
    color: white;
}

.btn-small.btn-delete {
    background: #EF4444;
    color: white;
}

.btn-small:hover {
    opacity: 0.9;
    transform: scale(1.02);
}

.btn-small:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row .form-group.half {
    flex: 1;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="datetime-local"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.required {
    color: #EF4444;
}

.image-upload-area {
    position: relative;
}

.image-upload-area input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.upload-preview {
    width: 100%;
    height: 150px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    overflow: hidden;
}

.upload-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.upload-preview i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.multi-image-upload {
    position: relative;
}

.multi-image-upload input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.images-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    min-height: 80px;
    padding: 10px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
}

.images-preview .image-item {
    width: 80px;
    height: 80px;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

.images-preview .image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.images-preview .image-item .remove-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 20px;
    height: 20px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-image-btn {
    width: 80px;
    height: 80px;
    border: 2px dashed var(--border-color);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
}

.add-image-btn i {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.add-image-btn span {
    font-size: 12px;
}

.registrations-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.registrations-header #activity-title-display {
    font-weight: 600;
    color: var(--text-primary);
}

.registration-count {
    font-size: 14px;
    color: var(--text-secondary);
}

.filter-bar.inline {
    margin-bottom: 1rem;
}

.filter-bar.inline select {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

.registrations-list {
    max-height: 400px;
    overflow-y: auto;
}

.registration-item {
    display: flex;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 10px;
    background: white;
}

.registration-item .user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    overflow: hidden;
}

.registration-item .user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.registration-item .user-info {
    flex: 1;
}

.registration-item .user-info .user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.registration-item .user-info .register-time {
    font-size: 12px;
    color: var(--text-secondary);
}

.registration-item .reg-status {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    margin-left: 12px;
}

.reg-status.pending { background: #FEF3C7; color: #D97706; }
.reg-status.approved { background: #D1FAE5; color: #059669; }
.reg-status.rejected { background: #FEE2E2; color: #DC2626; }

.registration-item .reg-actions {
    display: flex;
    gap: 8px;
    margin-left: 12px;
}

.registration-item .reg-actions button {
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    border: none;
    cursor: pointer;
}

.reg-actions .btn-approve {
    background: #10B981;
    color: white;
}

.reg-actions .btn-reject {
    background: #EF4444;
    color: white;
}

.activity-detail-view {
    padding: 1rem;
}

.activity-detail-view .cover-image {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.activity-detail-view h2 {
    margin: 0 0 1rem;
    color: var(--text-primary);
}

.activity-detail-view .detail-meta {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.activity-detail-view .detail-meta .meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.activity-detail-view .detail-meta .meta-item i {
    color: var(--accent-blue);
}

.activity-detail-view .description {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    line-height: 1.6;
}

.activity-detail-view .content-images {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 1rem;
}

.activity-detail-view .content-images img {
    width: 150px;
    height: 100px;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
}

.activity-detail-view .content-images img:hover {
    transform: scale(1.05);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn-secondary {
    padding: 8px 16px;
    background: #6B7280;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: #4B5563;
}

@media (max-width: 768px) {
    .activities-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .activity-detail-view .detail-meta {
        grid-template-columns: 1fr;
    }
}

.activity-card-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    background: var(--bg-secondary);
}

.btn-card-register,
.btn-card-cancel {
    width: 100%;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-card-register {
    background: var(--accent-blue);
    color: white;
}

.btn-card-register:hover {
    background: #2563EB;
}

.btn-card-cancel {
    background: #F97316;
    color: white;
    border: none;
}

.btn-card-cancel:hover {
    background: #EA580C;
}

.btn-card-registered {
    width: 100%;
    padding: 10px 16px;
    background: transparent;
    color: #6B7280;
    border: 2px solid #9CA3AF;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-card-registered:hover {
    background: #FEE2E2;
    color: #EF4444;
    border-color: #EF4444;
}

.badge-registered {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: #D1FAE5;
    color: #059669;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}