.quiz-page{max-width:940px;margin:auto;padding:32px 24px 64px}.quiz-intro{margin-bottom:30px}.quiz-intro h1{font-family:FieldbookModules,var(--book-serif);color:var(--rust,#a74723);font-size:clamp(30px,5vw,42px);margin:0 0 14px;line-height:1.4}.quiz-page p{line-height:1.9}.quiz-note,.quiz-page .quiz-draft-note{color:#606958;font-size:14px}.quiz-note{max-width:60ch}.quiz-message{padding:14px 0;color:#7d361c}.quiz-page button{min-height:48px;border:1px solid #626e4f;border-radius:8px;background:#626e4f;color:#fffaf1;font:inherit;padding:12px 22px;cursor:pointer}.quiz-page button:hover{background:#4d593e}.quiz-page button:disabled{opacity:.6;cursor:wait}.quiz-page :focus-visible{outline:3px solid #a74723;outline-offset:4px}.quiz-progress{position:sticky;top:0;z-index:2;padding:12px 0;background:#f6efe1;border-bottom:1px solid #d9ccb6;color:#38472c;font-variant-numeric:tabular-nums}.quiz-section{margin-top:32px;padding:26px;background:#fffaf1;border:1px solid #d9ccb6;border-radius:12px}.quiz-section h2{font-family:FieldbookSong,"Songti SC",serif;font-size:23px;margin:0 0 16px;line-height:1.6}.quiz-source{display:block;background:white;border:1px solid #e5dccb;border-radius:6px;overflow:hidden}.quiz-source img{width:100%;max-height:650px;object-fit:contain;display:block}.quiz-image-note{display:block;font-size:13px;color:#606958;margin-top:8px}.quiz-question{border:0;padding:26px 0 0;margin:26px 0 0;min-width:0;border-top:1px solid #d9ccb6}.quiz-question legend{font-size:17px;font-weight:600;line-height:1.8;max-width:100%;padding:0}.quiz-question legend span{color:#a74723;margin-right:8px}.quiz-options{display:grid;gap:10px;margin-top:14px}.quiz-option{display:flex;align-items:start;gap:10px;border:1px solid #d9ccb6;border-radius:7px;min-height:48px;padding:13px 14px;cursor:pointer;font-size:16px;line-height:1.7;overflow-wrap:anywhere}.quiz-option:hover{background:#f2f2e7}.quiz-option:has(input:checked){border-color:#626e4f;background:#edf0e3}.quiz-option input{margin:7px 0 0;width:17px;height:17px;flex-shrink:0;accent-color:#626e4f}.quiz-option:has(input:focus-visible){outline:3px solid #a74723;outline-offset:3px}.quiz-submit{padding:24px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}.quiz-submit p{color:#606958;font-size:14px;margin:0}.quiz-next{display:inline-block;color:#536140;text-underline-offset:5px;line-height:1.8;margin-top:24px}.quiz-result{border-top:1px solid #d9ccb6;padding:24px 0}.quiz-result h2{font-family:FieldbookSong,"Songti SC",serif;font-size:28px;color:#a74723;margin:0}.quiz-result .quiz-score{font-size:20px;font-weight:600;color:#293b2b}.quiz-result .quiz-review{padding:22px 0;border-bottom:1px solid #d9ccb6}.quiz-review h3{font-size:17px;line-height:1.9;margin:0 0 8px}.quiz-review p{margin:6px 0;font-size:16px}.quiz-correct{color:#455832}.quiz-wrong{color:#963b22}.quiz-explanation{color:#606958}.quiz-reviewed{margin-top:24px}.quiz-reviewed summary{padding:16px 0;cursor:pointer;color:#536140}.quiz-reviewed figure{margin:20px 0}.quiz-reviewed figcaption{margin-bottom:8px;font-weight:600}.quiz-entry{margin-top:32px;padding:24px 0;border-top:1px solid #d9ccb6}.quiz-entry h2{font-family:FieldbookSong,"Songti SC",serif;font-size:24px;color:#a74723;margin:0 0 10px}.quiz-entry p{color:#606958;line-height:1.8}.quiz-entry a{display:inline-block;background:#626e4f;color:#fffaf1;min-height:48px;padding:12px 22px;border-radius:8px;text-decoration:none;line-height:1.6}.quiz-entry a:hover{background:#4d593e}@media(max-width:600px){.quiz-page{padding:24px 18px 48px}.quiz-section{padding:20px 14px;margin-top:24px}.quiz-question legend{font-size:16px}.quiz-option{font-size:15px;padding:12px}.quiz-submit button{width:100%}.quiz-source img{max-height:none}.quiz-review p{font-size:15px}.quiz-entry{padding:22px 4px}}@media(prefers-reduced-motion:reduce){.quiz-page *{scroll-behavior:auto}}

/* Quiz copy is dynamic: use complete system CJK families, not the home-title glyph subset. */
.quiz-page,.quiz-entry{--quiz-serif:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC","SimSun",serif}
.quiz-page h2,.quiz-entry h2{font-family:var(--quiz-serif);font-weight:700;font-synthesis:weight;letter-spacing:normal}
.quiz-question legend,.quiz-review h3{font-family:var(--book-sans);font-weight:600;letter-spacing:normal}
.quiz-option,.quiz-review p{font-family:var(--book-sans);font-weight:400}
.quiz-review strong{font-weight:600}

/* A three-stage field mission: feedback marks progress, never correctness before submission. */
.challenge-route{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:22px 0 18px}.challenge-route>span{padding:12px 10px;border-bottom:2px solid #d9ccb6;color:#606958;font-size:15px;font-weight:600}.challenge-route small{display:block;font-size:12px;font-weight:400;margin-top:5px}.challenge-route .is-active{color:#823719;border-color:#a74723;background:#efe3cf;border-radius:8px 8px 0 0}.challenge-steps{display:flex;justify-content:space-between;gap:8px;margin-bottom:22px}.quiz-page .challenge-steps button{padding:0;min-height:40px;width:40px;border:1px solid #c8bea7;border-radius:50%;background:#fffaf1;color:#606958;font-variant-numeric:tabular-nums;flex-shrink:0}.quiz-page .challenge-steps button.is-answered{background:#e5ead9;border-color:#7b8965;color:#435338}.quiz-page .challenge-steps button[aria-current=step]{background:#a74723;color:#fffaf1;border-color:#a74723;box-shadow:0 3px 8px #674a2620}.challenge-paper{margin-top:0;animation:paper-arrive .18s ease-out}.challenge-paper h2{font-size:22px;color:#536140}.challenge-paper .quiz-question{padding-top:18px;margin-top:14px;border-top:1px dashed #d9ccb6}.challenge-paper .quiz-question legend{font-size:18px;line-height:1.9}.challenge-paper .quiz-question legend>span{display:block;color:#a74723;font-size:14px;margin-bottom:8px}.challenge-paper .quiz-option{padding:14px 16px;transition:background-color .15s,border-color .15s}.challenge-paper .quiz-option>span{display:flex;gap:12px}.challenge-paper .quiz-option b{font-weight:600;flex-shrink:0;color:#536140}.challenge-feedback{min-height:30px;margin:15px 0 0;color:#536140;font-size:14px}.challenge-actions{display:flex;gap:12px;align-items:center}.quiz-page .challenge-secondary{color:#536140;background:transparent;border-color:#bac2a8}.quiz-page .challenge-secondary:hover{background:#edf0e3}.quiz-page .challenge-secondary:disabled{cursor:default;opacity:.45}.quiz-submit{align-items:start}.quiz-submit>p{flex-basis:100%}.challenge-finish{padding:26px;background:#f0ecd9;border-radius:12px;border:1px solid #d9ccb6}.challenge-finish-label{font-size:14px;color:#606958;margin:0 0 8px}.guardian-stars{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.guardian-star{width:34px;height:34px;fill:#e4dfcf;stroke:#9c9c87;stroke-width:1.6}.guardian-star.is-lit{fill:#d4a34f;stroke:#987132}.challenge-review{margin:25px 0}.challenge-review>summary{font-size:17px;color:#536140;cursor:pointer;padding:15px 0;min-height:48px}.quiz-extension{padding:28px 0;margin-top:22px;border-top:1px dashed #b7b99f}.quiz-extension h2{font-size:24px;margin:0 0 12px;line-height:1.7}.quiz-extension p{max-width:62ch;color:#606958}.quiz-extension .quiz-next{background:#626e4f;color:#fffaf1;padding:14px 22px;border-radius:8px;text-decoration:none;min-height:48px;margin-top:10px}.quiz-extension .quiz-next:hover{background:#4d593e}@keyframes paper-arrive{from{transform:translateY(4px)}to{transform:translateY(0)}}@media(max-width:600px){.challenge-steps{gap:5px}.quiz-page .challenge-steps button{width:34px;min-height:34px}.challenge-route>span{font-size:14px;padding:10px 7px}.challenge-actions{width:100%}.challenge-actions button{flex:1;width:auto}.challenge-paper .quiz-question legend{font-size:16px}.challenge-finish{padding:20px 16px}.guardian-stars{gap:5px}.guardian-star{width:29px;height:29px}.quiz-extension h2{font-size:22px}}@media(max-width:350px){.quiz-page .challenge-steps button{width:29px;min-height:29px}.challenge-steps{gap:3px}.guardian-star{width:26px;height:26px}}@media(prefers-reduced-motion:reduce){.challenge-paper{animation:none}.challenge-paper .quiz-option{transition:none}}