*{box-sizing:border-box}body{margin:0;padding:16px 24px;background:#f5f6f3;color:#22312c;font:15px/1.5 "Microsoft YaHei",sans-serif}header,footer{max-width:1280;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}header{height:42px;border-bottom:1px solid #d5dfd7;margin-bottom:12px}header strong{font-size:21px}.badge{font-size:12px;margin-left:18px;background:#e4eee7;padding:5px 10px;border-radius:12px}main{max-width:1280;margin:auto}h1{font-size:21px;margin:8px 0 12px}h2{font-size:16px;margin:0 0 8px}p{margin:7px 0}button{font:inherit;color:#fff;background:#25644e;border:0;border-radius:6px;padding:9px 18px;cursor:pointer}button:disabled{opacity:.5;cursor:wait}input{font:inherit}input:not([type=radio]):not([type=checkbox]){padding:8px;border:1px solid #a8b9ae;border-radius:5px}.panel{background:white;border:1px solid #dde4dd;border-radius:10px;padding:18px}#start,#done{max-width:850px;margin:35px auto}.q-rules{font-size:14px}.q-rules p:first-child{font-weight:600}#qNodes{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:16px 0}fieldset{margin:0;padding:14px;border:1px solid #cddad0;border-radius:10px;background:#fff}legend{font-weight:600;padding:0 5px}fieldset label{display:block;padding:12px 8px;background:#f4f7f3;margin:10px 0;border-radius:6px;font-size:14px}fieldset input{margin-right:6px}.a-layout{display:grid;grid-template-columns:340px minmax(0,1fr);gap:24px}.a-layout aside{font-size:13px;line-height:1.55;padding:15px}.secondary{color:#516059}.a-decision>p{font-size:14px;line-height:1.5}.stats{display:flex;gap:20px;background:#e4eee7;padding:10px 14px;border-radius:8px;font-size:15px}.stats b{font-size:21px}canvas{display:block;width:100%;height:auto;max-height:230px;background:#fff;border:1px solid #d3ddd4;border-radius:10px;margin-top:10px}#feedback{min-height:43px;padding:9px 0;font-size:18px;font-weight:bold;color:#205b47}footer{margin-top:14px;font-size:12px;color:#65756a}footer button{font-size:12px;padding:6px 12px;background:#64766c}#error{color:#a83028;font-weight:600}#reconnect{background:#785634}[hidden]{display:none!important}@media(max-width:900px){body{padding:12px}.a-layout{grid-template-columns:1fr}.a-layout aside{font-size:14px}#qNodes{grid-template-columns:1fr}.badge{display:block;margin:0}header{height:auto;min-height:55px}.stats{flex-wrap:wrap}}@media(min-width:1000px) and (max-height:800px){body{padding-top:10px;padding-bottom:10px}.a-layout{gap:18px}.a-layout aside{font-size:12.5px;line-height:1.45}.a-decision>p{margin:6px 0}h1{font-size:19px;margin:5px 0 8px}footer{margin-top:8px}canvas{max-height:215px}}

#quizQuestions{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}#quiz label{display:inline-block;margin-right:14px}footer{gap:12px}footer button{font-size:12px;padding:6px}#start input[type=checkbox]{width:auto}#start label{margin-right:10px}
@media(max-height:680px){header,footer{padding:6px 16px}main{padding:6px 16px}h1{font-size:19px;margin:4px 0}.a-layout{grid-template-columns:290px 1fr;gap:12px}.a-layout p{font-size:12px;line-height:1.45;margin:6px 0}.a-layout .panel{padding:12px}.a-layout h2{font-size:15px;margin:3px 0}#arena{max-height:170px}.stats{font-size:13px}#feedback{min-height:20px;font-size:14px}.q-rules p{font-size:12px}#qNodes fieldset{padding:9px}#qNodes p,#qNodes label{font-size:12px}footer{font-size:10px}}

@media(max-height:680px){body{padding:8px 12px}header{height:34px;margin-bottom:6px;padding:0 8px}main{padding:0 8px}.a-layout{grid-template-columns:330px minmax(0,1fr)}footer{padding:2px 8px;margin-top:6px}.a-layout .panel{padding:10px}}

/* Landing-page presentation only. Frozen Q/A decision layouts are unchanged. */
#start.welcome{max-width:1080px;margin:20px auto;padding:0;overflow:hidden;border-radius:16px;border-color:#d9e2dc;box-shadow:0 12px 36px #19352a08}
.welcome-head{padding:26px 30px 20px;background:#edf3ef;border-bottom:1px solid #dbe5de}.eyebrow{font-size:11px;letter-spacing:2px;color:#517362;font-weight:700}.welcome-head h1{font-size:29px;letter-spacing:-.5px;margin:8px 0}.welcome-lead{color:#52675c;font-size:14px}.welcome-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));padding:20px 30px;gap:30px}.welcome-steps>div{position:relative;padding-left:34px}.step-no{position:absolute;left:0;top:1px;font-size:12px;color:#688473;font-weight:700}.welcome-steps h2{font-size:15px;margin:0 0 6px}.welcome-steps p{font-size:13px;line-height:1.65;color:#607168;margin:0}.welcome-note{margin:0 30px;padding:12px 16px;border-left:3px solid #abc4b2;background:#f7f9f6;font-size:13px;color:#4c6155}.welcome-note p{margin:4px 0}.welcome-note strong{color:#274e3a}.welcome-form{padding:18px 30px 24px}.form-row{display:flex;gap:24px;align-items:end}.form-row label{font-size:12px;color:#66796d;display:flex;flex-direction:column;gap:5px}.form-row .preview-code{flex:1}.form-row input{width:100%;font-size:12px;background:#f8faf7;color:#728277}.form-row select{padding:8px 24px 8px 10px;border:1px solid #a8b9ae;border-radius:5px;background:white;color:#2e483a;font:inherit;min-height:36px}.welcome-checks{display:flex;gap:12px 22px;flex-wrap:wrap;margin:16px 0;font-size:13px}.welcome-checks label{display:flex;align-items:center;gap:5px}.welcome-checks .consent-line{flex-basis:100%}.welcome-checks input{accent-color:#25644e}.welcome-action{display:flex;align-items:center;gap:18px}.welcome-action button{padding:11px 25px;border-radius:8px;min-width:155px;font-weight:600}.welcome-action button span{margin-left:14px}.welcome-action>span{font-size:12px;color:#738278}#start button:disabled{cursor:not-allowed}#previewAgain{margin-top:15px}
@media(max-width:750px){.welcome-head{padding:22px}.welcome-head h1{font-size:24px}.welcome-steps{grid-template-columns:1fr;padding:20px 22px;gap:18px}.welcome-note{margin:0 22px}.welcome-form{padding:18px 22px}.form-row,.welcome-action{align-items:stretch;flex-direction:column;gap:10px}.welcome-checks{gap:12px}.welcome-action>span{text-align:center}}
@media(min-width:1000px) and (max-height:680px){#start.welcome{margin:8px auto}.welcome-head{padding:16px 24px 12px}.welcome-head h1{font-size:25px}.welcome-steps{padding:13px 24px;gap:20px}.welcome-note{margin:0 24px;padding:8px 12px}.welcome-form{padding:12px 24px 15px}.welcome-checks{margin:12px 0;gap:8px 18px}}

/* Participant wording v2: Q only; A geometry and choice mapping are retained. */
#q{max-width:1280px;margin:auto}.q-subtitle{color:#52655a;margin:0 0 14px;font-size:15px}
.q-rules{display:grid;grid-template-columns:1fr 1fr;gap:26px;font-size:14px;line-height:1.6;padding:16px 20px}.q-rules h2{font-size:16px;margin:0 0 7px}.q-rules p:first-child{font-weight:400}.q-rules p{margin:5px 0}.q-rules ul{margin:6px 0;padding-left:22px}.q-rules>div+div{border-left:1px solid #e0e7e1;padding-left:24px}
#qNodes{gap:16px;margin:16px 0}#qNodes fieldset{padding:12px 16px}#qNodes legend{font-size:16px}#qNodes p{font-size:14px}#qNodes .q-opportunities{display:inline-block;font-size:12px;color:#53665a;background:#edf2ee;padding:2px 8px;border-radius:4px;margin:0 0 3px}
#qNodes label{display:flex;align-items:flex-start;gap:8px;padding:11px;margin:9px 0;border:1px solid transparent;font-size:15px;cursor:pointer}#qNodes label:has(input:checked){border-color:#47765d;background:#edf4ee}#qNodes input{margin:5px 0 0;flex-shrink:0;accent-color:#25644e}#qNodes strong{display:block;font-weight:600}.q-option-detail{display:block;font-size:14px;line-height:1.6;margin-top:3px}#qSubmit{padding:10px 24px}
#participationOptions{position:relative;flex-shrink:0}#participationOptions summary{cursor:pointer;padding:5px 8px;border-radius:5px;color:#52665a}#participationOptions summary:focus-visible{outline:2px solid #25644e}.participation-menu{position:absolute;right:0;bottom:100%;z-index:20;min-width:190px;background:white;border:1px solid #cad8ce;border-radius:8px;padding:7px;box-shadow:0 4px 20px #18362820}.participation-menu button{display:block;width:100%;text-align:left;background:white;color:#304c3e;padding:9px}.participation-menu button:hover{background:#edf3ef}
@media(min-width:1000px) and (max-height:680px){.q-subtitle{font-size:13px;margin-bottom:8px}.q-rules{padding:10px 14px;gap:18px;line-height:1.45}.q-rules p,.q-rules li{font-size:12px;margin:3px 0}.q-rules h2{font-size:14px;margin-bottom:4px}.q-rules ul{margin:4px 0}.q-rules>div+div{padding-left:18px}#qNodes{margin:10px 0;gap:10px}#qNodes fieldset{padding:8px 10px}#qNodes legend{font-size:14px}#qNodes label{padding:7px;margin:7px 0;font-size:13px}#qNodes p,.q-option-detail{font-size:12px}#qSubmit{padding:8px 18px}}
@media(max-width:900px){.q-rules{grid-template-columns:1fr;gap:16px}.q-rules>div+div{border-left:0;border-top:1px solid #e0e7e1;padding:14px 0 0}footer{align-items:flex-start;flex-wrap:wrap}}
@media(min-width:1000px) and (max-height:680px){.q-rules{line-height:1.4}#qNodes{margin:8px 0}#qNodes p{margin:4px 0}#qNodes label{padding:6px;margin:5px 0}#qNodes .q-opportunities{margin:0 0 2px}}
@media(min-width:1000px) and (min-height:681px){.q-rules{line-height:1.5;padding:14px 20px}#qNodes{margin:12px 0}#qNodes label{padding:9px;margin:8px 0}}

/* v3: keep width stable; emphasize the Q-only instruction without framing a choice. */
#qSubtitle{font-weight:600;color:#294b3c;background:#eaf1ec;border-left:3px solid #6d917a;padding:8px 12px;border-radius:0 5px 5px 0}
#qNodes .q-opportunities strong{display:inline;font-size:inherit}
@media(min-width:1000px) and (max-height:680px){#qSubtitle{padding:2px 9px;margin-bottom:7px}}

#qHypotheticalNote{font-size:14px;line-height:1.6;color:#294b3c;margin:12px 0 0;font-weight:600}
@media(min-width:1000px) and (max-height:680px){#qHypotheticalNote{font-size:12px;margin-top:8px}}

/* Four-page participant rules confirmation; identifiers remain in submitted values only. */
#quiz{max-width:960px;margin:20px auto;padding:24px 30px}#quiz h1{margin-top:0}#quizRound{color:#52665a;line-height:1.65;margin-bottom:14px}#quizRulesBox{background:#f4f7f3;border:1px solid #d9e3db;border-radius:8px;padding:10px 14px;margin:12px 0 20px}#quizRulesBox summary{cursor:pointer;color:#385b46}#quizRules{font-size:14px;line-height:1.6;margin-top:10px}#quizPageTitle{font-size:17px;margin:18px 0 16px}#quizPageTitle:focus{outline:none}#quizQuestions{display:grid;grid-template-columns:1fr;gap:16px}#quizQuestions fieldset{padding:12px 16px}#quizQuestions legend{font-size:15px;font-weight:600}#quiz label{display:inline-flex;align-items:flex-start;gap:7px;margin:7px 12px 2px 0;padding:9px 12px;border:1px solid transparent;font-size:14px;cursor:pointer}#quiz label:has(input:checked){border-color:#47765d;background:#edf4ee}#quiz input{margin-top:4px;accent-color:#25644e}.quiz-navigation{display:flex;justify-content:flex-end;gap:12px;margin-top:22px}#quizPrevious{background:#edf2ee;color:#385b46}#quizContinue{min-width:120px}#quizQuestions input:focus-visible{outline:2px solid #25644e;outline-offset:3px}
@media(max-height:680px){#quiz{margin:10px auto;padding:18px 22px}#quizQuestions{gap:12px}#quiz label{padding:7px 10px}#quizPageTitle{margin:12px 0}#quizRulesBox{margin-bottom:14px}}