/* Original integrations: cross-paper wrong-answer analysis + external DooEnglish reference index. */
.doo-filter-area{background:#fff;border:1px solid #e0e8de;border-radius:18px;padding:20px 22px;margin:25px 0 27px}
.doo-filter-title{font-size:11px;font-weight:800;color:#718973;margin:14px 0 10px}
.doo-filter-title:first-child{margin-top:0}
.doo-filters{display:flex;gap:7px;flex-wrap:wrap;align-items:center}
.doo-chip{border-radius:99px;border:1px solid #dfe7db;background:#fff;color:#677c6a;font-size:11px;font-weight:700;padding:9px 13px;min-height:36px;white-space:nowrap}
.doo-chip.active{background:#294a34;color:#fff;border-color:#294a34}
.doo-chip:hover:not(.active){border-color:#a6c993;background:#f7fbf3}
.doo-mistake-list{display:grid;grid-template-columns:1fr;gap:16px}
.doo-mistake-card{border:1px solid #e0e8dd;border-radius:20px;background:#fff;padding:clamp(22px,4vw,31px);box-shadow:0 12px 30px rgba(24,43,31,.025);min-width:0}
.doo-mistake-header{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;align-items:center;color:#899c89;font-size:11px;font-weight:780;letter-spacing:.035em}
.doo-mistake-card h3{font-size:19px;line-height:1.7;font-weight:740;letter-spacing:-.025em;white-space:pre-line;overflow-wrap:anywhere;margin:17px 0}
.doo-mistake-photo{width:100%;max-width:420px;max-height:245px;object-fit:contain;border-radius:12px;margin:18px 0 0;background:#f5f7f3}
.doo-status{font-size:10px;font-weight:800;background:#fff1eb;color:#ab634b;border-radius:99px;padding:6px 10px;letter-spacing:0}
.doo-status.blank{background:#f4f1e7;color:#957a4a}
.doo-answer-comparison{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:15px 0}
.doo-answer-comparison>div{border:1px solid #eedfd7;background:#fff8f4;border-radius:13px;padding:16px}
.doo-answer-comparison>div+div{border-color:#d5e7ce;background:#f3faed}
.doo-answer-comparison small{font-size:10px;font-weight:800;color:#9a725f}
.doo-answer-comparison>div+div small{color:#5f8554}
.doo-answer-comparison p{font-size:12px;line-height:1.9;color:#38483a;overflow-wrap:anywhere;margin:7px 0 0}
.doo-answer-explanation{padding:17px 19px;border-radius:13px;background:#f6f8f3;margin:13px 0}
.doo-answer-explanation strong{color:#3e6143;font-size:12px}
.doo-answer-explanation p,.doo-reason p{color:#667968;font-size:12px;line-height:1.95;margin:6px 0 0}
.doo-reason{border-left:3px solid #aacb84;background:#f4f8ef;border-radius:0 12px 12px 0;padding:15px 17px;margin:16px 0}
.doo-focus{font-size:11px;font-weight:850;color:#4c7846}
.doo-local-lesson{border:1px solid #c2ddae;background:#eaf5e1;color:#386844;font-size:11px;font-weight:770;padding:11px 14px;border-radius:11px;min-height:41px;margin:2px 0 12px;max-width:100%;text-align:left}
.doo-local-lesson:hover{background:#def0d1}
.doo-resource-related{margin:17px 0 6px}
.doo-resource-related>span{font-size:11px;display:block;margin-bottom:9px;font-weight:800;color:#809580}
.doo-link-pair{display:flex;flex-wrap:wrap;align-items:center;gap:10px;border-top:1px solid #ecf0ea;padding:11px 0;font-size:11px;line-height:1.6}
.doo-link-pair span{flex:1 1 170px;color:#5a715e;font-weight:700}
.doo-link-pair a,.doo-lesson-extension a{color:#377548;font-weight:770;text-decoration:underline;text-underline-offset:3px;white-space:nowrap}
.doo-link-pair a:hover,.doo-lesson-extension a:hover{color:#214f2e}
.doo-question-context{border-top:1px solid #edf1e9;margin-top:16px;padding-top:15px}
.doo-question-context summary{cursor:pointer;font-size:12px;font-weight:750;color:#557354}
.doo-question-context pre{white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.95 -apple-system,BlinkMacSystemFont,"PingFang TC",system-ui,sans-serif;color:#607362;background:#f8faf6;border-radius:11px;padding:17px;margin:12px 0 0}
.doo-origin-note{font-size:11px;line-height:1.9;color:#8e9d90;margin:24px 0}
.doo-origin-note a{color:#397145;text-decoration:underline;text-underline-offset:3px}
.doo-origin-header{display:flex;align-items:center;gap:11px;flex-wrap:wrap;background:#ebf4e2;border:1px solid #dfebd5;border-radius:16px;padding:18px 21px;margin:17px 0 20px}
.doo-origin-header strong{font-size:13px;color:#38583d;flex:1 1 260px}
.doo-origin-header span{font-size:10px;color:#829580}
.doo-origin-header a{font-size:11px;font-weight:790;color:#3b7445;text-decoration:underline;text-underline-offset:3px}
.doo-course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0}
.doo-course-card{border:1px solid #dfe8dc;background:white;border-radius:16px;padding:20px;min-width:0;display:flex;flex-direction:column}
.doo-course-no{font-size:10px;font-weight:800;letter-spacing:.07em;color:#7c977b}
.doo-course-card h3{font-size:17px;line-height:1.55;letter-spacing:-.035em;margin:14px 0 8px;overflow-wrap:anywhere}
.doo-course-card p{font-size:11px;color:#899b89;line-height:1.7;margin:0 0 18px}
.doo-course-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:auto}
.doo-course-actions a{font-size:11px;font-weight:780;padding:10px 13px;border-radius:10px;background:#eff5e9;color:#386943;min-height:40px;text-decoration:none;display:inline-flex;align-items:center}
.doo-course-actions a+ a{background:#f6f7f4;border:1px solid #dfe8db;color:#5e7962}
.doo-course-actions a:hover{filter:brightness(.95)}
.doo-lesson-extension{border-top:1px solid #e6ede2;margin:24px 0 0;padding-top:15px}
.doo-lesson-extension>p{font-size:12px;color:#819582;line-height:1.9}
.doo-exam-diagnostic{border:1px solid #deebd6;background:#f1f8eb;padding:16px 17px;border-radius:13px;margin-top:15px}
.doo-exam-diagnostic>strong{display:block;font-size:12px;color:#4a7743}
.doo-exam-diagnostic>p{font-size:12px;color:#688068;line-height:1.85;margin:9px 0 10px}
.doo-exam-diagnostic .doo-link-pair{border-color:#dce9d4}
@media(max-width:800px){.doo-course-grid{grid-template-columns:1fr}.doo-mistake-card{padding:22px 18px}.doo-filter-area{padding:17px}.doo-link-pair{gap:8px}}
@media(max-width:480px){.doo-answer-comparison{grid-template-columns:1fr;gap:8px}.doo-course-card{padding:19px 17px}.doo-chip{padding:9px 12px;font-size:10px}.doo-mistake-card h3{font-size:17px}.doo-origin-header{padding:16px}.doo-course-actions a{flex:1;justify-content:center}}
@media(prefers-reduced-motion:reduce){.doo-course-card,.doo-chip{transition:none}}