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.btn{width:100%;justify-content:center}@media(min-width:768px){.exercise-actions{flex-direction:row;gap:var(--spacing-md)}.exercise-actions .btn{width:auto}}.empty-state{text-align:center;padding:var(--spacing-2xl) var(--spacing-lg);color:var(--color-text-muted)}.empty-state__icon{margin-bottom:var(--spacing-md);color:var(--color-text-faint)}.empty-state__text{font-size:15px}.back-link{display:inline-flex;align-items:center;gap:var(--spacing-xs);font-size:14px;font-weight:600;color:var(--color-primary);text-decoration:none;margin-bottom:var(--spacing-md);transition:opacity var(--transition)}.back-link:hover{opacity:.7}.cat-card{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);text-decoration:none;color:inherit;transition:all var(--transition)}.cat-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md);transform:translateY(-1px)}.cat-card:active{transform:scale(.99)}.cat-card__icon{width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff}.cat-card__body{flex:1;min-width:0}.cat-card__title{font-size:15px;font-weight:700;color:var(--color-text);margin-bottom:2px}.cat-card__desc{font-size:12px;color:var(--color-text-muted);line-height:1.4}.cat-card__meta{display:flex;align-items:center;gap:var(--spacing-sm);margin-top:4px}.cat-card__count{font-size:11px;font-weight:600;color:var(--color-text-faint)}.cat-card__arrow{color:var(--color-text-faint);flex-shrink:0;transition:transform var(--transition)}.cat-card:hover .cat-card__arrow{transform:translate(3px);color:var(--color-primary)}@media(min-width:768px){.cat-card{gap:var(--spacing-lg);padding:var(--spacing-md) var(--spacing-lg)}.cat-card__icon{width:48px;height:48px}}.mini-bar{height:4px;background:var(--color-surface-2);border-radius:999px;overflow:hidden;margin-top:6px}.mini-bar__fill{height:100%;border-radius:999px;background:var(--color-learned);transition:width .5s ease}.level-filter-btn{padding:8px 16px;border-radius:999px;font-size:13px;font-weight:600;border:1.5px solid var(--color-border);background:var(--color-surface);color:var(--color-text-muted);cursor:pointer;transition:all var(--transition);flex:1;text-align:center}@media(min-width:768px){.level-filter-btn{flex:none}}.level-filter-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.level-filter-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}