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(max-width:899px){.practice-screen{grid-template-columns:minmax(0,1fr)}.practice-topics{position:static;max-height:340px}}@media (prefers-reduced-motion:reduce){.quiz-option{transition:none}}.source-window{display:grid;grid-gap:var(--sp-2);gap:var(--sp-2)}.source-frame{width:100%;min-height:320px;border:1px solid var(--line-strong);border-radius:var(--r);background:#fff}.source-load{min-height:120px;border:1px dashed var(--line-strong);border-radius:var(--r);background:var(--sunken)}.source-tab{font-size:var(--fs-sm);justify-self:start}.real-practice{display:grid;grid-gap:var(--sp-4);gap:var(--sp-4)}.real-elsewhere{margin:0 0 var(--sp-3);color:var(--muted,inherit);font-size:.95em}.real-unit{display:grid;grid-gap:var(--sp-3);gap:var(--sp-3)}.real-part{display:grid;grid-gap:var(--sp-2);gap:var(--sp-2);padding-top:var(--sp-2);border-top:1px solid var(--border,rgba(127,127,127,.25))}.real-part-label{font-weight:600}.real-part input[type=text]{width:100%}.real-work{unicode-bidi:plaintext}.real-choices{display:flex;flex-wrap:wrap;gap:var(--sp-2)}.real-practice .practice-prompt .md,.revealed .md{unicode-bidi:plaintext}.real-choices button{min-width:3rem}.real-choices button.chosen{border-color:var(--primary);background:var(--brand-soft);box-shadow:inset 0 0 0 1px var(--primary)}.feedback-head .md{flex:1 1 12rem;min-width:0}.feedback-head .md p{margin:0}.real-note{font-size:var(--fs-sm);opacity:.75}