:root{font-family:Microsoft YaHei,PingFang SC,Noto Sans CJK SC,Arial,sans-serif;color:#1d2b3f;background:#f6f8fb;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:#f6f8fb;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid rgba(38,119,207,.25);outline-offset:2px}.experiment-app{min-height:100vh}.topbar{height:82px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100% - 1280px)/2));background:#fff;border-bottom:1px solid #dbe4ef}.brand-block{display:flex;align-items:center;gap:13px}.brand-mark{width:44px;height:44px;display:grid;place-items:center;color:#246fbe;background:#eaf3fc;border-radius:50%}.brand-block h1,.brand-block p{margin:0}.brand-block h1{font-size:21px}.brand-block p{margin-top:3px;font-size:13px;color:#728196}.progress-label{font-size:14px;font-weight:700;color:#33516f}.research-note{height:38px;display:flex;align-items:center;justify-content:flex-end;padding:0 max(24px,calc((100% - 1280px)/2));font-size:13px;color:#7d8b9d;background:#fbfcfe;border-bottom:1px solid #edf1f5}.main-content{width:min(1280px,calc(100% - 40px));margin:0 auto;padding:38px 0 60px}.page-card{background:#fff;border:1px solid #dde6f0;border-radius:16px;padding:30px;box-shadow:0 10px 30px #223a570f}.consent-page{width:min(760px,100%);margin:0 auto}.page-card h1,.page-card h2{margin-top:0}.page-card p{line-height:1.8;color:#4f6075}.check-list{display:grid;gap:12px;margin:24px 0}.check-list label,.compact-card label{display:flex;align-items:flex-start;gap:10px;line-height:1.6}.button-row,.survey-actions,.composer-actions,.inline-controls{display:flex;gap:12px;align-items:center;justify-content:flex-end}.primary-button,.secondary-button,.danger-button{min-height:46px;border-radius:10px;padding:0 20px;font-weight:700;border:1px solid transparent}.primary-button{color:#fff;background:#2677cf}.primary-button:hover{background:#1f68b8}.primary-button.compact{min-height:46px}.secondary-button{color:#245987;background:#fff;border-color:#aac2da}.danger-button{color:#fff;background:#b73535}.form-error,.validation-hint{color:#b32828!important;background:#fff3f3;padding:10px 12px;border-radius:8px}.loading-state{padding:48px;text-align:center;color:#607287}.loading-state.full{min-height:100vh;display:grid;place-items:center}.scenario-page{width:min(900px,100%);margin:auto;display:grid;gap:20px}.scenario-card{background:#fff;border:1px solid #d8e3ef;border-radius:16px;overflow:hidden;box-shadow:0 8px 24px #223a570f}.scenario-heading{width:100%;display:flex;align-items:center;gap:10px;padding:18px 20px;border:0;color:#254a6d;background:#eef5fc;font-weight:700;text-align:left}.scenario-heading span{flex:1}.scenario-caret{transition:transform .2s}.scenario-card.is-open .scenario-caret{transform:rotate(180deg)}.scenario-content{padding:20px;max-height:calc(100vh - 210px);overflow:auto}.scenario-content h3{margin:20px 0 8px;font-size:16px;color:#245987}.scenario-content h3:first-child{margin-top:0}.scenario-content p{margin:8px 0;line-height:1.75;color:#405269}.compact-card{padding:22px;display:grid;gap:13px}.compact-card h2{font-size:18px;margin-bottom:4px}.compact-card .primary-button{justify-self:end}.chat-layout{display:grid;grid-template-columns:minmax(300px,380px) minmax(0,1fr);gap:22px;align-items:start}.chat-layout>.scenario-card{position:sticky;top:18px}.chat-panel{min-height:680px;display:grid;grid-template-rows:auto minmax(360px,1fr) auto auto;background:#fff;border:1px solid #d8e3ef;border-radius:16px;overflow:hidden}.chat-status{display:flex;justify-content:space-between;padding:14px 18px;font-size:13px;color:#5b6d81;background:#f8fafc;border-bottom:1px solid #e4eaf1}.messages{padding:22px;overflow:auto}.empty-chat{min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:#77879a}.message-row{display:flex;gap:10px;margin-bottom:22px;align-items:flex-start}.message-row.user{flex-direction:row-reverse;text-align:right}.message-row>div{max-width:78%}.message-row strong{font-size:13px;color:#566a80}.message-avatar{width:38px;height:38px;display:grid;place-items:center;flex:0 0 38px;border-radius:50%;color:#246fbe;background:#e8f2fc}.message-bubble{margin-top:6px;padding:13px 16px;line-height:1.75;text-align:left;white-space:pre-wrap;background:#f2f5f8;border-radius:6px 16px 16px}.message-row.user .message-bubble{background:#e2effc;border-radius:16px 6px 16px 16px}.typing{padding:10px;color:#667a90}.chat-composer{padding:16px 18px;background:#fbfcfe;border-top:1px solid #e0e7ef}.chat-composer label{display:block;margin-bottom:8px;font-size:13px;font-weight:700}.chat-composer textarea{width:100%;min-height:94px;padding:12px;border:1px solid #b8c8d9;border-radius:10px;resize:vertical}.composer-actions{margin-top:12px}.survey-shell{width:min(900px,100%);margin:auto}.survey-shell>header{margin-bottom:20px}.survey-shell>header h1{margin-bottom:8px}.survey-shell>header p,.page-guidance{color:#5b6d81;line-height:1.7}.survey-form{background:#fff;border:1px solid #dae4ee;border-radius:16px;padding:28px}.survey-progress{float:right;color:#63778c;font-size:14px}.survey-form h2{margin-top:0}.question-card{margin:20px 0;padding:18px;border:1px solid #e0e7ef;border-radius:12px}.question-card legend{padding:0 6px;font-weight:700;line-height:1.6}.question-card textarea,.question-card input[type=number]{width:100%;padding:11px;border:1px solid #bdcada;border-radius:8px}.option-grid{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap;margin-top:12px}.option-grid label{display:flex;align-items:center;gap:6px;min-height:42px;padding:7px 10px;border:1px solid #d3deea;border-radius:8px;background:#fbfcfe}.option-grid .anchor{display:flex;align-items:center;font-size:13px;color:#5e7085}.completion-page{width:min(680px,100%);margin:30px auto;text-align:center}.completion-page svg{color:#25805e}.admin-login{min-height:100vh;display:grid;place-items:center;padding:20px}.admin-login .page-card{width:min(440px,100%)}.admin-login label{display:grid;gap:8px}.admin-login input,.admin-section input,.admin-section select{min-height:44px;padding:8px 11px;border:1px solid #bdcada;border-radius:8px}.admin-login button{width:100%;margin-top:18px}.admin-shell{width:min(1120px,calc(100% - 40px));margin:0 auto;padding:40px 0 70px}.admin-shell>header p{color:#63758a}.admin-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}.metric-card{padding:22px;background:#fff;border:1px solid #dde6ef;border-radius:14px}.metric-card h2{font-size:16px;margin:0}.metric-card strong{display:block;margin-top:14px;font-size:34px;color:#2269ad}.metric-card p{margin:4px 0 0;color:#6b7d91}.admin-section{margin-top:18px}.admin-section h2{font-size:18px}.operation-result{word-break:break-all}.danger-zone{border-color:#efcaca}.detail-list{display:grid;grid-template-columns:130px 1fr;gap:10px}.detail-list dt{font-weight:700}.detail-list dd{margin:0}.admin-message{padding:14px 0;border-top:1px solid #e3e9ef}.admin-message p{margin-bottom:0}.text-button{border:0;background:transparent;color:#236db5;padding:0;margin-bottom:16px}@media(max-width:820px){.topbar{height:auto;padding:16px 20px;align-items:flex-start}.brand-mark{display:none}.brand-block h1{font-size:18px}.research-note{height:auto;padding:9px 20px;justify-content:flex-start}.main-content{width:calc(100% - 24px);padding:18px 0 38px}.page-card{padding:20px}.chat-layout{grid-template-columns:1fr}.chat-layout>.scenario-card{position:static}.scenario-content{max-height:50vh}.chat-panel{min-height:620px}.chat-status{gap:10px;flex-wrap:wrap}.messages{padding:15px}.message-row>div{max-width:86%}.composer-actions,.button-row,.inline-controls{align-items:stretch;flex-direction:column}.composer-actions button,.button-row button,.inline-controls>*{width:100%}.option-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.option-grid .anchor{grid-column:span 1}.option-grid label{justify-content:center}.survey-form{padding:18px}.survey-progress{float:none;margin-bottom:10px}.admin-grid{grid-template-columns:1fr}.admin-shell{width:calc(100% - 24px);padding-top:20px}.detail-list{grid-template-columns:1fr}.detail-list dd{margin-bottom:8px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}