.pb-head{display:flex;gap:var(--space-gap);padding-top:var(--space-gap)}.pb-back,.pb-head{align-items:center}.pb-back{width:36px;height:36px;border-radius:var(--radius-pill);background:var(--color-surface);border:1px solid var(--color-border);display:inline-flex;justify-content:center;color:var(--color-ink);text-decoration:none;flex:none}.pb-title{font-size:var(--type-h1-size);line-height:var(--type-h1-line);font-weight:800;letter-spacing:-.02em;margin:0}.pb-summary{margin:calc(var(--space-gap-lg) * -1 + 2px) 0 0;color:var(--color-ink2);font-size:var(--type-caption-size);line-height:var(--type-caption-line)}.pb-empty{display:flex;flex-direction:column;gap:6px}.pb-empty__title{margin:0;font-size:17px;line-height:22px;font-weight:700}.pb-groups{display:flex;flex-direction:column;gap:var(--space-gap)}.pb-group{background:var(--color-surface);border-radius:var(--radius-card);box-shadow:var(--elevation-card);overflow:hidden}.pb-group__head{width:100%;display:flex;align-items:center;gap:var(--space-gap);padding:14px 16px;border:0;background:none;font-family:inherit;color:var(--color-ink);text-align:left;cursor:pointer}.pb-group__title{flex:1 1;font-size:17px;line-height:22px;font-weight:700}.pb-group__count{min-width:26px;height:26px;padding:0 8px;border-radius:var(--radius-pill);background:var(--color-primary-soft);color:var(--color-primary-text);font-size:12px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}.pb-group__chevron{display:inline-flex;color:var(--color-ink3);transition:transform .25s ease}.pb-group__chevron[data-open=false]{transform:rotate(-90deg)}.pb-collapse{display:grid;grid-template-rows:0fr;transition:grid-template-rows .35s ease}.pb-collapse[data-open=true]{grid-template-rows:1fr}.pb-collapse__inner{min-height:0;overflow:hidden}.pb-group__body{padding:0 16px 16px;gap:var(--space-gap-lg)}.pb-group__body,.pb-lesson{display:flex;flex-direction:column}.pb-lesson{gap:8px}.pb-lesson__module{margin:0}.pb-lesson__title{margin:0;font-size:16px;line-height:22px;font-weight:700}.pb-card{background:var(--color-page);border:1px solid var(--color-border);border-radius:var(--radius-card-sm);padding:var(--space-gap-lg);display:flex;flex-direction:column;gap:var(--space-gap)}.pb-card__text{margin:0;font-size:15px;line-height:24px;white-space:pre-wrap}.pb-card__actions{display:flex;align-items:center;gap:8px}.pb-card__copy{flex:1 1;border:0;border-radius:var(--radius-button);background:var(--color-primary);color:var(--color-ink);font-weight:700;padding:10px 12px}.pb-card__copy,.pb-card__remove{font-family:inherit;font-size:var(--type-caption-size);cursor:pointer}.pb-card__remove{flex:none;border:1px solid var(--color-border);border-radius:var(--radius-button);background:var(--color-surface);color:var(--color-danger);font-weight:600;padding:10px 14px}@media (prefers-reduced-motion:reduce){.pb-collapse,.pb-group__chevron{transition:none}}