.toefl-grammar-quiz-root{--bg:#f7fafc;--card:#fff;--text:#1f2937;--muted:#607187;--primary:#0f766e;--border:#d5dee8;--ok:#1f8a3f;--bad:#bf2f45;font-family:"Segoe UI",Tahoma,Geneva,Verdana,sans-serif;color:var(--text);max-width:900px;margin:0 auto}
.toefl-grammar-quiz-root *{box-sizing:border-box;min-width:0}
.toefl-grammar-quiz-root .card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:12px;box-shadow:0 8px 24px rgba(17,24,39,.06);margin-bottom:10px}
.toefl-grammar-quiz-root h2,.toefl-grammar-quiz-root h3,.toefl-grammar-quiz-root p{margin:0}
.toefl-grammar-quiz-root .sub{margin-top:4px;color:var(--muted);font-size:.92rem}
.toefl-grammar-quiz-root .meta{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.toefl-grammar-quiz-root .chip{display:inline-flex;border:1px solid var(--border);border-radius:999px;padding:3px 8px;font-size:.82rem;color:var(--muted);background:#f8fbff}
.toefl-grammar-quiz-root .progress{height:10px;background:#e9eff5;border-radius:999px;overflow:hidden}
.toefl-grammar-quiz-root .progress>div{height:100%;width:0;background:linear-gradient(90deg,#0f766e,#14b8a6);transition:width .2s ease}
.toefl-grammar-quiz-root .prompt{margin-top:10px;font-size:.98rem;color:var(--muted);font-weight:600}
.toefl-grammar-quiz-root .sentence{margin-top:6px;font-size:1.1rem;line-height:1.4;word-break:break-word}
.toefl-grammar-quiz-root .seg{padding:1px 4px;border-radius:6px;border:1px dashed #b9ccdf;background:#f8fbff}
.toefl-grammar-quiz-root .choices{display:grid;gap:6px;margin-top:10px}
.toefl-grammar-quiz-root .choice{width:100%;text-align:left;border:1px solid var(--border);border-radius:11px;background:#fff;padding:10px;line-height:1.3;cursor:pointer}
.toefl-grammar-quiz-root .choice:hover{background:#f7fbff}
.toefl-grammar-quiz-root .choice.selected{border-color:#86a8c8;background:#eef7ff}
.toefl-grammar-quiz-root .choice.correct{border-color:var(--ok);background:#eefaf2}
.toefl-grammar-quiz-root .choice.wrong{border-color:var(--bad);background:#fff1f4}
.toefl-grammar-quiz-root .actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.toefl-grammar-quiz-root button{border:1px solid var(--border);background:#fff;color:var(--text);border-radius:10px;padding:8px 11px;cursor:pointer}
.toefl-grammar-quiz-root button.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.toefl-grammar-quiz-root button:disabled{opacity:.55;cursor:not-allowed}
.toefl-grammar-quiz-root .feedback{display:none;margin-top:8px;border-radius:10px;padding:9px;border:1px solid var(--border);background:#f7fbff;line-height:1.35}
.toefl-grammar-quiz-root .feedback.ok{display:block;border-color:#98d5ab;background:#eefaf2}
.toefl-grammar-quiz-root .feedback.bad{display:block;border-color:#ef9eab;background:#fff2f5}
.toefl-grammar-quiz-root .hidden{display:none}
.toefl-grammar-quiz-root table{width:100%;border-collapse:collapse;margin-top:8px}
.toefl-grammar-quiz-root th,.toefl-grammar-quiz-root td{border:1px solid var(--border);padding:7px;text-align:left;font-size:.9rem}
@media (max-width:700px){.toefl-grammar-quiz-root .sentence{font-size:1rem}}