.ad-root{background:var(--color-bg-page);min-height:100vh;color:var(--color-text-primary);font:var(--text-body);box-sizing:border-box}body:has(.ad-root){background:var(--color-bg-page);margin:0}.ad-root *,.ad-root :before,.ad-root :after{box-sizing:border-box}.ad-root :focus-visible{outline:3px solid var(--color-border-focus);outline-offset:2px}.ad-header{background:var(--color-bg-surface);border-bottom:1px solid var(--color-border-default)}.ad-header-inner{align-items:center;gap:var(--space-2) var(--space-4);flex-wrap:wrap;max-width:1120px;margin:0 auto;padding:10px 16px;display:flex}.ad-header-end{align-items:center;gap:var(--space-4);margin-left:auto;display:flex}.ad-brand{align-items:center;gap:var(--space-2);display:inline-flex}.ad-parent-link{color:var(--color-text-brand);font:var(--text-label);text-decoration:none}.ad-nav{flex-wrap:wrap;gap:4px;display:flex}.ad-nav a{border-radius:var(--radius-sm);color:var(--color-text-primary);border:1px solid #0000;padding:8px 12px;font-weight:600;text-decoration:none;display:inline-block}.ad-nav a:hover{background:var(--color-bg-brand-soft)}.ad-nav a[aria-current=page]{background:var(--color-bg-brand-soft);border-color:var(--color-action-primary);color:var(--color-action-primary)}.ad-main{flex-direction:column;gap:20px;max-width:1120px;margin:0 auto;padding:20px 16px 56px;display:flex}.ad-title{margin:0;font-size:26px;line-height:1.2}.ad-h2{margin:0 0 8px;font-size:18px}.ad-muted{color:var(--color-text-secondary)}.ad-small{font-size:14px}.ad-sr{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.ad-card{background:var(--color-bg-surface);border:1px solid var(--color-border-default);border-radius:var(--radius-md);padding:16px}.ad-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;display:grid}.ad-stat{background:var(--color-bg-surface);border:1px solid var(--color-border-default);border-radius:var(--radius-md);padding:14px}.ad-stat-num{font-size:30px;font-weight:800;line-height:1.1;display:block}.ad-stat-label{color:var(--color-text-secondary);font-size:14px;display:block}.ad-callout{border-radius:var(--radius-md);border:2px solid var(--color-feedback-warning-border);background:var(--color-feedback-warning-bg);color:var(--color-feedback-warning-text);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;padding:18px 20px;display:flex}.ad-callout.ad-callout-clear{border-color:var(--color-feedback-correct-border);background:var(--color-feedback-correct-bg);color:var(--color-feedback-correct-text)}.ad-callout-num{font-size:34px;font-weight:800;line-height:1.1}.ad-callout-text{font-size:19px;font-weight:700}.ad-btn{appearance:none;font:inherit;border:2px solid var(--color-action-primary);background:var(--color-bg-surface);min-height:44px;color:var(--color-action-primary);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:8px 18px;font-weight:700;text-decoration:none;display:inline-flex}.ad-btn:hover:not(:disabled){background:var(--color-bg-brand-soft)}.ad-btn:disabled{opacity:.55;cursor:not-allowed}.ad-btn-primary{background:var(--color-action-primary);color:var(--color-text-on-brand)}.ad-btn-primary:hover:not(:disabled){background:var(--color-action-primary);filter:brightness(1.1)}.ad-btn-danger{border-color:var(--color-feedback-incorrect-border);color:var(--color-feedback-incorrect-border);background:var(--color-bg-surface)}.ad-btn-danger:hover:not(:disabled){background:var(--color-feedback-incorrect-bg)}.ad-btn-quiet{border-color:var(--color-border-control);color:var(--color-text-primary)}.ad-kbd{opacity:.85;border:1px solid;border-radius:4px;padding:0 5px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}.ad-field{flex-direction:column;gap:4px;display:flex}.ad-label{font-size:14px;font-weight:700}.ad-input,.ad-select,.ad-textarea{font:inherit;border:1px solid var(--color-border-control);border-radius:var(--radius-sm);background:var(--color-bg-surface);min-height:42px;color:var(--color-text-primary);max-width:100%;padding:8px 10px}.ad-textarea{resize:vertical;min-height:72px}.ad-row{flex-wrap:wrap;align-items:flex-end;gap:12px;display:flex}.ad-error{border:1px solid var(--color-feedback-incorrect-border);background:var(--color-feedback-incorrect-bg);color:var(--color-feedback-incorrect-text);border-radius:10px;margin:0;padding:10px 14px}.ad-ok{border:1px solid var(--color-feedback-correct-border);background:var(--color-feedback-correct-bg);color:var(--color-feedback-correct-text);border-radius:10px;margin:0;padding:10px 14px}.ad-badge{text-transform:uppercase;letter-spacing:.04em;border-radius:var(--radius-full);border:1px solid var(--color-border-default);color:var(--color-text-secondary);padding:2px 8px;font-size:12px;font-weight:800;display:inline-block}.ad-badge-good{background:var(--color-feedback-correct-bg);color:var(--color-feedback-correct-text);border-color:var(--color-feedback-correct-border)}.ad-badge-warn{background:var(--color-feedback-warning-bg);color:var(--color-feedback-warning-text);border-color:var(--color-feedback-warning-border)}.ad-badge-bad{background:var(--color-feedback-incorrect-bg);color:var(--color-feedback-incorrect-text);border-color:var(--color-feedback-incorrect-border)}.ad-badge-info{background:var(--color-bg-brand-soft);color:var(--color-action-primary);border-color:var(--color-action-primary)}.ad-card-info{border-color:var(--color-action-primary)}.ad-toolbar{flex-wrap:wrap;align-items:flex-end;gap:12px 20px;display:flex}.ad-tabs{flex-wrap:wrap;gap:4px;display:flex}.ad-tab{appearance:none;font:inherit;border-radius:var(--radius-sm);border:1px solid var(--color-border-control);background:var(--color-bg-surface);min-height:40px;color:var(--color-text-primary);cursor:pointer;padding:6px 14px;font-weight:700}.ad-tab[aria-pressed=true]{background:var(--color-bg-brand-soft);border-color:var(--color-action-primary);color:var(--color-action-primary)}.ad-review{grid-template-columns:300px minmax(0,1fr);align-items:start;gap:16px;display:grid}.ad-list{border:1px solid var(--color-border-default);border-radius:var(--radius-md);background:var(--color-bg-surface);max-height:70vh;margin:0;padding:0;list-style:none;overflow:auto}.ad-list-lesson{text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-secondary);background:var(--color-bg-page);border-bottom:1px solid var(--color-border-default);padding:6px 12px;font-size:12px;font-weight:800;position:sticky;top:0}.ad-list-item{appearance:none;font:inherit;text-align:left;border:0;border-bottom:1px solid var(--color-border-default);width:100%;color:var(--color-text-primary);cursor:pointer;background:0 0;align-items:flex-start;gap:8px;padding:8px 12px;display:flex}.ad-list-item:hover{background:var(--color-bg-brand-soft)}.ad-list-item[aria-current=true]{background:var(--color-bg-brand-soft);box-shadow:inset 4px 0 0 var(--color-action-primary)}.ad-list-prompt{-webkit-line-clamp:2;-webkit-box-orient:vertical;flex:1;font-size:14px;display:-webkit-box;overflow:hidden}.ad-mark-state{text-align:center;flex:none;width:22px;font-weight:800}.ad-q-prompt{margin:8px 0 12px;font-size:20px;font-weight:700}.ad-options{flex-direction:column;gap:6px;margin:0 0 12px;padding:0;list-style:none;display:flex}.ad-option{border:1px solid var(--color-border-control);border-radius:var(--radius-sm);align-items:center;gap:10px;padding:8px 12px;display:flex}.ad-option-key{border-color:var(--color-feedback-correct-border);background:var(--color-feedback-correct-bg);color:var(--color-feedback-correct-text);font-weight:700}.ad-answer{border:2px solid var(--color-feedback-correct-border);background:var(--color-feedback-correct-bg);color:var(--color-feedback-correct-text);border-radius:var(--radius-sm);margin:0 0 12px;padding:10px 12px;font-weight:700}.ad-answer-none{border-color:var(--color-feedback-incorrect-border);background:var(--color-feedback-incorrect-bg);color:var(--color-feedback-incorrect-text)}.ad-meta{flex-wrap:wrap;gap:6px 14px;margin:0 0 12px;padding:0;list-style:none;display:flex}.ad-held{border:1px solid var(--color-feedback-warning-border);background:var(--color-feedback-warning-bg);color:var(--color-feedback-warning-text);border-radius:var(--radius-sm);margin:0 0 12px;padding:10px 12px;font-size:15px}.ad-actions{flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px;display:flex}.ad-actions-spacer{flex:1}.ad-source{border-top:1px solid var(--color-border-default);margin-top:14px;padding-top:12px}.ad-excerpt{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--color-bg-page);border:1px solid var(--color-border-default);border-radius:var(--radius-sm);max-height:320px;margin:6px 0 12px;padding:10px 12px;font-family:inherit;font-size:15px;position:relative;overflow:auto}.ad-excerpt-open{max-height:none}.ad-excerpt mark{background:var(--color-bg-highlight);color:inherit;border-radius:3px;padding:0 2px}.ad-progress{border-radius:var(--radius-full);background:var(--color-border-default);height:8px;overflow:hidden}.ad-progress>span{background:var(--color-feedback-correct-border);height:100%;display:block}.ad-stack{flex-direction:column;gap:12px;display:flex}.ad-flag-desc{overflow-wrap:anywhere;margin:6px 0 8px}.ad-details summary{cursor:pointer;padding:6px 0;font-weight:700}@media (max-width:860px){.ad-review{grid-template-columns:minmax(0,1fr)}.ad-list{max-height:260px}}@media (max-width:480px){.ad-title{font-size:22px}.ad-q-prompt{font-size:18px}.ad-btn{flex:100%}.ad-actions-spacer{display:none}}@media (prefers-reduced-motion:reduce){.ad-root *{transition:none!important}}