/* Design tokens: one quiet neutral system with a single ink-blue accent.
   Experiment pages stay calm (no gradients, no motion); the lab home page may use the decorative extras at the end. */
:root{
 --bg:#f5f6f8;--surface:#fff;--surface-2:#f8f9fb;--surface-3:#f1f3f6;
 --line:#e3e6ec;--line-strong:#cdd2db;
 --ink:#121722;--text:#262c38;--muted:#5d6676;--faint:#8b93a2;
 --accent:#2f45d0;--accent-hover:#2436ad;--accent-soft:#eef1fd;--accent-line:#c8d0f7;--accent-ink:#1f2f96;
 --good:#1d7350;--good-soft:#ebf6f0;--good-line:#c4e2d2;
 --warn:#835812;--warn-soft:#fbf6ea;--warn-line:#ead9b4;
 --danger:#a3392f;--danger-soft:#fcf1ef;--danger-line:#ecc9c3;
 --focus:#2f45d0;
 --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
 font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
 color:var(--text);background:var(--bg);font-synthesis:none;-webkit-font-smoothing:antialiased;
}
*{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.75;background:var(--bg)}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}
button{cursor:pointer;border:1px solid var(--line-strong);background:var(--surface);border-radius:8px;padding:10px 17px;color:var(--ink);font-weight:550;line-height:1.6;transition:background-color .15s,border-color .15s}
button:hover:not(:disabled){border-color:#aab2c0;background:var(--surface-2)}button:disabled{cursor:not-allowed;opacity:.45}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible,.upload-label:focus-within{outline:2px solid var(--focus);outline-offset:3px}
button.primary,button.dark{background:var(--accent);border-color:var(--accent);color:#fff}button.primary:hover:not(:disabled),button.dark:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}
button.danger{color:var(--danger);border-color:var(--danger-line);background:var(--surface)}button.danger:hover:not(:disabled){background:var(--danger-soft);border-color:#dba79f}button.small{padding:6px 11px;font-size:13px}

/* Top bar */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 max(28px,calc((100vw - 1384px)/2));border-bottom:1px solid var(--line);background:var(--surface);min-height:60px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}.brand strong{font-size:16px;letter-spacing:.2px;font-weight:650}
.mark{display:block;width:26px;height:26px;flex-shrink:0;color:var(--accent)}
.brand-en,.brand-sub{border-left:1px solid var(--line);padding-left:12px;margin-left:4px;font-size:13px;color:var(--muted);font-weight:400}
nav{display:flex;gap:22px;font-size:14px}.topbar nav a{color:var(--muted);padding:4px 0}.topbar nav a:hover{color:var(--ink)}
body[data-view=study] .topbar nav{display:none}

/* Type */
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);font-weight:500;margin-bottom:8px}h1,h2,h3,p{margin-top:0}
h1{font-size:28px;line-height:1.4;letter-spacing:-.2px;margin-bottom:10px;font-weight:650;color:var(--ink)}h2{font-size:20px;line-height:1.55;font-weight:620;color:var(--ink)}h3{font-size:16px;line-height:1.65;font-weight:600;color:var(--ink)}
p{color:var(--muted);margin-bottom:17px}small,.muted{color:var(--muted);font-size:13px;font-weight:400}

/* Layout + surfaces */
.page{max-width:1100px;margin:auto;padding:36px 28px 65px}.page.wide{max-width:1480px}.heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}.heading p{margin-bottom:0;font-size:14px}
.badge{display:inline-flex;align-items:center;gap:7px;padding:4px 11px;background:var(--accent-soft);color:var(--accent-ink);border:1px solid var(--accent-line);border-radius:999px;font-size:12px;white-space:nowrap}.badge::before{content:'';width:6px;height:6px;border-radius:50%;background:currentColor}.badge.off{background:var(--surface-3);border-color:var(--line);color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}.stat{border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:18px 22px}
.stat strong{display:block;font-size:28px;line-height:1.4;color:var(--ink);font-variant-numeric:tabular-nums;font-weight:600}.stat span{font-size:13px;color:var(--muted)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:26px;margin-bottom:20px}.card.dark{background:var(--surface);color:var(--text)}.card.dark p,.card.dark .muted{color:var(--muted)}
.card>h2,.card>h3{margin-bottom:14px}.card.accent{border-top:2px solid var(--accent)}.card>:last-child{margin-bottom:0}.split{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(250px,1fr);gap:24px}
.empty{max-width:720px;margin:64px auto;text-align:center;padding:32px}.empty .round{width:56px;height:56px;border-radius:50%;background:var(--accent-soft);display:grid;place-items:center;font-size:24px;margin:0 auto 23px}
.readable{white-space:pre-wrap;overflow-wrap:anywhere;color:var(--text);max-height:380px;overflow:auto;line-height:1.9}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.row.between{justify-content:space-between}.row>h2,.row>h3{margin-bottom:0}.spaced{margin-top:22px}
.rule-list{padding-left:21px;color:var(--text)}.rule-list li{margin:12px 0}.form-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px 22px}.form-grid>p{align-self:end;padding-bottom:10px}.full{grid-column:1/-1}

/* Forms */
label.field{display:flex;flex-direction:column;gap:8px;font-size:14px;font-weight:550;margin-bottom:17px;min-width:0;color:var(--ink)}.field-help{display:block;color:var(--muted);font-size:13px;font-weight:400;line-height:1.75;margin:-6px 0 19px}label.field .field-help{margin:0}
input,textarea,select{width:100%;border:1px solid var(--line-strong);border-radius:8px;background:var(--surface);padding:10px 12px;color:var(--ink);min-height:44px}
input:hover,textarea:hover,select:hover{border-color:#a6aebc}input:focus,textarea:focus,select:focus{border-color:var(--accent)}input:disabled,textarea:disabled,select:disabled{background:var(--surface-3);color:var(--muted);border-color:var(--line)}
input::placeholder,textarea::placeholder{color:var(--faint);font-weight:400}textarea{resize:vertical;min-height:116px;line-height:1.8;font-size:14px}
input[type=checkbox],input[type=radio]{width:18px;height:18px;min-height:18px;accent-color:var(--accent);flex-shrink:0}
.check{display:flex;align-items:flex-start;gap:10px;margin:15px 0;font-size:14px}.check input{margin-top:4px}

/* Notices */
.notice{background:var(--surface-2);border:1px solid var(--line);border-left:3px solid var(--accent-line);border-radius:8px;padding:13px 16px;margin:18px 0;font-size:13px;color:var(--text);line-height:1.85}
.notice.warn{background:var(--warn-soft);border-color:var(--warn-line);border-left-color:#d9b46a;color:var(--warn)}.notice.error{background:var(--danger-soft);border-color:var(--danger-line);border-left-color:#d58c82;color:var(--danger)}.error:empty{display:none}
.timer{font-family:var(--mono);font-size:24px;font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:.5px;color:var(--accent)}

/* Task workspace */
.work-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:20px;align-items:start}.work-grid .card{margin-bottom:18px;padding:22px}.work-grid h2{font-size:19px}
.work-grid .card.accent h2{white-space:pre-wrap;overflow-wrap:anywhere;margin:10px 0 16px;font-size:17px;line-height:1.8}
.chat-panel{display:flex;flex-direction:column;min-height:560px;height:clamp(560px,80vh,820px);position:sticky;top:20px}
.chat-panel>.row{padding-bottom:12px;border-bottom:1px solid var(--line)}.chat-panel>p{margin:12px 0 4px}
.chat-log{height:330px;overflow:auto;display:flex;flex-direction:column;gap:12px;padding:12px 3px;margin-bottom:16px;scrollbar-width:thin;scrollbar-color:#c5cbd5 transparent}
.chat-panel>.chat-log{flex:1;min-height:180px}.chat-log.short{height:186px;margin-top:10px}
.bubble,.chat-panel.dark .bubble{background:var(--surface-3);border:1px solid var(--line);padding:11px 14px;border-radius:10px 10px 10px 3px;max-width:94%;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--text);font-size:14px;line-height:1.85}
.bubble.mine,.chat-panel.dark .bubble.mine{align-self:flex-end;background:var(--accent-soft);border-color:var(--accent-line);border-radius:10px 10px 3px 10px}
.bubble .author,.chat-panel.dark .author{display:block;font-family:var(--mono);font-size:11px;font-weight:500;color:var(--faint);margin-bottom:4px;letter-spacing:.04em}
.chat-panel.dark textarea{background:var(--surface);color:var(--ink)}.chat-panel.dark textarea:disabled{background:var(--surface-3)}
.composer{margin-top:auto}.composer textarea{min-height:80px}.composer .row{margin-top:10px}.idea-entry{border-top:1px solid var(--line);padding:13px 0}.idea-entry strong{font-size:13px}.idea-entry p{white-space:pre-wrap;overflow-wrap:anywhere;margin:6px 0;color:var(--text)}

/* Admin */
.tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:25px;border-bottom:1px solid var(--line);padding-bottom:15px}.tabs button{background:transparent;border-color:transparent;font-size:14px;color:var(--muted)}
.tabs button.active{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent-line)}.tab-index{font-family:var(--mono);font-size:11px;color:var(--faint);font-variant-numeric:tabular-nums;letter-spacing:1px}.tabs button.active .tab-index{color:var(--accent)}
.page.admin-page{max-width:1310px}.admin-layout{display:grid;grid-template-columns:178px minmax(0,1fr);align-items:start;gap:28px}
.admin-layout>.tabs{display:flex;flex-direction:column;flex-wrap:nowrap;position:sticky;top:24px;gap:6px;border-bottom:0;padding:0;margin:0}
.admin-layout>.tabs button{display:flex;align-items:center;gap:13px;text-align:left;padding:11px 14px;border-radius:8px;white-space:nowrap}.admin-content{min-width:0}.admin-content .card{padding:26px 28px}.admin-content .card>p{font-size:14px}
.section-title{display:flex;align-items:center;gap:12px;margin:0 0 15px}.section-title h2,.section-title h3{margin:0}
.step-number{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;flex-shrink:0;border-radius:8px;background:var(--accent-soft);color:var(--accent-ink);font-family:var(--mono);font-size:12px;font-weight:600;font-variant-numeric:tabular-nums}
.protocol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:16px 0 20px}.protocol div{background:var(--surface-2);border:1px solid var(--line);padding:16px 14px;border-radius:8px}.protocol strong{display:block;font-size:21px;font-weight:600;color:var(--ink)}.protocol span{font-size:12px;color:var(--muted)}
.condition-card{border:1px solid var(--line);border-radius:10px;padding:23px;margin:22px 0;background:var(--surface-2)}.condition-card:last-child{margin-bottom:0}.condition-card>.number{display:inline-block;background:var(--accent-soft);border-radius:5px;padding:4px 10px;color:var(--accent-ink)}
.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px;text-align:left}td,th{border-bottom:1px solid var(--line);padding:13px 12px;vertical-align:top}th{color:var(--muted);font-weight:550;background:var(--surface-2)}td .small{white-space:nowrap}

/* Ratings */
.rating-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:25px;margin-bottom:20px}.rating-card>h3{white-space:pre-wrap;overflow-wrap:anywhere;margin-top:8px;font-size:17px;line-height:1.85}
.rating-dimension{border-top:1px solid var(--line);padding-top:16px;margin-top:19px}.rating-dimension h3{font-size:14px;margin-bottom:12px}.rating-options{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.rating-options.source{grid-template-columns:repeat(4,minmax(0,1fr))}
.rating-options label{display:flex;align-items:center;gap:8px;border:1px solid var(--line-strong);border-radius:8px;padding:13px 10px;cursor:pointer;font-size:13px;background:var(--surface)}.rating-options label:hover{border-color:#a6aebc;background:var(--surface-2)}.rating-options label:has(input:checked){background:var(--accent-soft);border-color:var(--accent);color:var(--accent-ink)}
.number{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--faint);font-weight:500}.modal-shade{position:fixed;inset:0;background:#12172299;z-index:30;display:grid;place-items:center;padding:25px}.modal{background:var(--surface);border-radius:14px;padding:30px;width:min(740px,100%);max-height:90vh;overflow:auto;box-shadow:0 24px 64px #0b10203d}.modal h2{margin-top:0}.modal .row{justify-content:flex-end;margin-top:22px}
#notice{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);max-width:min(580px,90vw);background:var(--ink);color:#fff;border-radius:10px;padding:12px 20px;box-shadow:0 8px 30px #0b102033;z-index:50;display:none;font-size:14px}#notice.visible{display:block}
.footnote{font-size:12px;line-height:1.8;color:var(--faint);margin-top:26px;padding-top:17px;border-top:1px solid var(--line)}.mini-progress{height:4px;border-radius:8px;background:var(--line);margin:20px 0;overflow:hidden}.mini-progress>span{display:block;height:100%;background:var(--accent)}
.countdown-box{padding:25px;background:var(--surface-2);border:1px solid var(--line);border-radius:10px;margin:24px auto;max-width:500px}.center{text-align:center}.pill-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.pill-list span{background:var(--surface-3);border:1px solid var(--line);border-radius:5px;padding:4px 9px;font-size:13px}
.login{max-width:480px;margin:48px auto;padding:34px}.login button{width:100%;margin-top:5px}
.config-actions{position:sticky;bottom:12px;z-index:10;background:#fffffff5;border:1px solid var(--line-strong);border-radius:10px;padding:14px 17px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;align-items:center;box-shadow:0 6px 24px #0b10201a;margin-top:23px}
.config-actions .row{gap:8px}.config-actions button{font-size:13px;padding:9px 13px}.config-actions #save-status{font-size:12px}
.lock-note{padding:20px;text-align:center;background:var(--surface-2);border:1px solid var(--line);border-radius:8px;color:var(--muted)}.loading{padding:40px;color:var(--muted)}.connection-banner{background:var(--warn-soft);color:var(--warn);padding:12px 24px;text-align:center;border-bottom:1px solid var(--warn-line)}.metric-caption{margin-top:6px;font-size:12px;color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
summary{cursor:pointer;color:var(--accent-ink);font-weight:550;padding:7px 0}summary::marker{color:var(--accent)}

/* Materials */
.material-pages{max-width:1000px;margin:20px auto}.material-pages figure{margin:0 0 24px}.material-pages img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:6px;background:#fff}.material-pages figcaption{font-size:12px;color:var(--muted);margin-top:9px;text-align:center}
.participant-code{position:sticky;top:12px;z-index:8;display:flex;align-items:center;gap:15px;flex-wrap:wrap;padding:11px 20px;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;margin-bottom:22px;box-shadow:0 2px 10px #0b10200d;font-size:14px;color:var(--muted)}
.participant-code strong{font-family:var(--mono);font-size:24px;color:var(--ink);font-weight:600;letter-spacing:.06em}.participant-code span{font-size:13px;color:var(--faint)}
.tips-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;margin-bottom:20px}.tip-panel{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:24px;min-height:175px}.tip-panel p{white-space:pre-wrap;overflow-wrap:anywhere;margin:14px 0 0;color:var(--text);font-size:15px;line-height:1.9}
.image-editor{margin:22px 0;border-top:1px solid var(--line);padding-top:22px}.image-editor:first-child{margin-top:0;padding-top:0;border-top:0}.image-editor h3{margin-bottom:7px}.image-editor>p{font-size:13px}
.upload-surface{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px;background:var(--surface-2);border:1px dashed var(--line-strong);border-radius:10px;padding:19px;margin:14px 0;min-height:99px}
.upload-label{display:inline-flex;align-items:center;justify-content:center;position:relative;padding:10px 16px;background:var(--surface);border:1px solid var(--line-strong);color:var(--ink);border-radius:8px;cursor:pointer;overflow:hidden;font-size:13px;font-weight:550}
.upload-label:hover{border-color:#a6aebc;background:var(--surface-2)}.upload-label input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}.upload-label:has(input:disabled){cursor:wait;opacity:.6}
.upload-status{color:var(--muted);font-size:12px;line-height:1.8;margin:8px 0 0}.image-preview{display:flex;align-items:center;gap:16px;min-width:0;flex:1 1 220px}
.image-preview img{display:block;max-width:150px;max-height:128px;width:auto;height:auto;object-fit:contain;border:1px solid var(--line);border-radius:6px;background:#fff}.image-preview>a{flex-shrink:0}.image-preview>div{min-width:0}.image-preview strong,.image-preview p{overflow-wrap:anywhere;font-size:13px;margin-bottom:5px}
.image-thumbnails{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;margin:18px 0}.image-thumbnails>div{border:1px solid var(--line);border-radius:8px;padding:10px}.image-thumbnails img{height:165px;width:100%;object-fit:contain;background:var(--surface-3)}.image-thumbnails .row{margin-top:8px;gap:6px}
.consent-actions{justify-content:space-between;margin-top:25px;padding-top:22px;border-top:1px solid var(--line)}.material-downloads a{text-decoration:underline;text-underline-offset:3px;color:var(--accent-ink)}.material-downloads li{margin:10px 0;overflow-wrap:anywhere}
.posttest-actions{display:flex;align-items:center;flex-wrap:wrap;gap:13px 20px;border-top:1px solid var(--line);padding-top:22px;margin-top:24px}.posttest-actions .posttest-hint{margin:0}.posttest-hint{font-size:13px;color:var(--muted);line-height:1.8}.posttest-hint.warn{color:var(--warn)}

/* Progress steps */
.experiment-progress{margin:0 0 24px}.experiment-progress ol,ol.experiment-progress{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:0 0 24px;padding:0}
.experiment-progress li{display:flex;align-items:center;gap:9px;border-bottom:2px solid var(--line);padding:8px 8px 11px;color:var(--faint);font-size:12px}
.experiment-progress li>span:first-child{display:inline-grid;place-items:center;width:23px;height:23px;flex-shrink:0;background:var(--surface-3);border:1px solid var(--line);border-radius:50%;font-family:var(--mono);font-size:11px}
.experiment-progress li.current,.experiment-progress li[aria-current=step]{color:var(--ink);border-color:var(--accent);font-weight:600}
.experiment-progress li.current>span:first-child,.experiment-progress li[aria-current=step]>span:first-child{background:var(--accent);border-color:var(--accent);color:#fff}.experiment-progress li.done{color:var(--muted);border-color:var(--accent-line)}.experiment-progress li.done>span:first-child{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent-ink)}
.room-page>.heading{margin-bottom:20px}.room-stage{max-width:1050px;margin:0 auto}.room-stage:has(.work-grid){max-width:none}.room-stage>.card.center{padding:38px 28px}
@media(min-width:881px){
 .room-page.wide{padding-top:24px}.room-page.wide>.heading{margin-bottom:14px}.room-page.wide h1{font-size:25px;margin-bottom:6px}.room-page.wide .eyebrow{margin-bottom:4px}
 .room-page.wide>.experiment-progress{margin-bottom:18px}.room-page.wide .experiment-progress li{padding-top:4px;padding-bottom:8px}
 .work-grid>.chat-panel{position:sticky;top:18px;height:calc(100dvh - 36px);min-height:0;max-height:620px}
 .work-grid>.chat-panel>.chat-log{flex:1;min-height:100px}.work-grid .chat-log.short{height:120px}
 .work-grid .card{padding:19px;margin-bottom:15px}.work-grid .composer textarea{min-height:68px}.work-grid .card.accent h2{margin:8px 0 13px}
}
@media(max-width:1100px){
 .admin-layout{grid-template-columns:150px minmax(0,1fr);gap:20px}.admin-layout>.tabs button{padding:11px;gap:9px;font-size:13px}.admin-content .card{padding:23px}
 .work-grid{gap:16px}.work-grid .card{padding:20px}.protocol{grid-template-columns:repeat(2,minmax(0,1fr))}.rating-options,.rating-options.source{grid-template-columns:repeat(2,minmax(0,1fr))}.split{grid-template-columns:1fr}
}
@media(max-width:880px){
 .brand-en,.brand-sub{display:none}.page{padding:28px 22px 60px}.admin-layout{grid-template-columns:1fr;gap:0}
 .admin-layout>.tabs{position:static;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;border-bottom:1px solid var(--line);padding-bottom:17px;margin-bottom:22px}
 .admin-layout>.tabs button{justify-content:center}.heading{align-items:flex-start}.chat-panel{min-height:540px;height:75vh}.work-grid>.chat-panel>.row{align-items:flex-start;flex-direction:column;gap:8px}.tips-grid{gap:14px}.tip-panel{padding:20px}
}
@media(max-width:720px){
 body{font-size:15px}.topbar{padding:0 16px;gap:12px;min-height:56px}.brand{gap:8px}.brand strong{font-size:15px}.mark{width:24px;height:24px}nav{gap:15px}.topbar nav a{font-size:13px}
 .page{padding:25px 16px 45px}h1{font-size:24px}h2{font-size:19px}.heading{align-items:flex-start;flex-direction:column;gap:16px;margin-bottom:24px}.work-grid,.form-grid,.tips-grid{grid-template-columns:1fr}
 .card,.admin-content .card{padding:20px;border-radius:10px}.condition-card{padding:18px}.stats{gap:9px;margin:20px 0}.stat{padding:14px 10px;border-radius:8px}.stat strong{font-size:24px}.stat span{font-size:11px}
 .config-actions{bottom:8px;padding:13px}.config-actions .row{gap:7px}.config-actions button{font-size:12px;padding:8px 10px}
 .chat-panel{position:static;min-height:430px;height:560px}.work-grid>.chat-panel>.row{align-items:center;flex-direction:row}.chat-log{height:250px}.empty{margin:35px auto;padding:20px}
 .rating-card{padding:20px}.rating-options label{font-size:13px;padding:12px 8px}.participant-code{position:static;gap:8px 12px;padding:11px 15px}.participant-code strong{font-size:22px}.participant-code span{flex-basis:100%}
 .tip-panel{min-height:130px}.upload-surface{padding:15px}.image-preview img{max-width:110px;max-height:110px}.modal-shade{padding:15px}.modal{padding:23px}
 .consent-actions{align-items:stretch}.consent-actions button{flex:1 1 220px}.experiment-progress li{font-size:11px;padding:7px 0 10px;gap:5px}.experiment-progress li>span:first-child{width:20px;height:20px;font-size:10px}
 .posttest-actions{align-items:stretch;flex-direction:column}
}
@media(max-width:390px){.admin-layout>.tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.tab-index{display:none}.experiment-progress li{flex-direction:column;text-align:center}.topbar nav{gap:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}

/* Persistent task tips inside the workspace */
.task-tip{flex-shrink:0;margin:12px 0;padding:11px 14px;border:1px solid var(--warn-line);border-radius:8px;background:var(--warn-soft);color:#5e4a22;font-size:13px;line-height:1.8;overflow-wrap:anywhere}.task-tip>strong{display:block;font-size:12px;margin-bottom:4px;color:var(--warn)}.task-tip>div{white-space:pre-wrap}.task-tip-2,.task-tip-4{background:var(--surface-2);border-color:var(--line);color:var(--text)}.task-tip-2>strong,.task-tip-4>strong{color:var(--muted)}.work-grid>.persistent-tips-panel{height:auto;max-height:none;min-height:620px}.work-grid>.persistent-tips-panel>.chat-log{flex:1 0 160px;height:clamp(160px,26vh,300px);min-height:160px}.persistent-tips-panel .composer{flex-shrink:0}.persistent-tips-panel .task-tip{margin-top:10px;margin-bottom:12px}@media(max-width:720px){.work-grid>.persistent-tips-panel{min-height:0;position:static}.task-tip{padding:11px 12px}}
.consent-frame{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;align-items:center;gap:12px}.consent-frame .material-pages{width:100%;margin:12px auto}.consent-slide{margin:0!important}.consent-slide[hidden]{display:none}.consent-arrow{padding:0;width:44px;height:52px;font-size:24px;font-weight:500;border-color:var(--line-strong);background:var(--surface);color:var(--ink)}.consent-arrow:disabled{opacity:.25}.consent-prev{grid-column:1}.consent-next{grid-column:3}.consent-page-number{text-align:center;margin:8px 0;font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--muted);font-size:13px}.consent-carousel .field-help{margin-bottom:20px}@media(max-width:600px){.consent-frame{grid-template-columns:34px minmax(0,1fr) 34px;gap:5px}.consent-arrow{width:34px;height:48px;font-size:21px}}

/* Material emphasis colours and stepwise, immutable ratings */
.text-red{color:#b42332}.text-blue{color:#175ca5}.text-green{color:#226647}.text-purple{color:#7041a0}.text-orange{color:#a74b0c}
.format-field{min-width:0}.format-field>label{font-weight:600}.format-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:7px;padding:9px 11px;background:var(--surface-2);border:1px solid var(--line);border-radius:8px 8px 0 0}.format-toolbar button{padding:6px 10px;font-size:12px;background:var(--surface)}.format-toolbar select{width:auto;min-width:80px;padding:5px 9px;font-size:12px}.format-field textarea{margin-top:-8px;border-radius:0 0 8px 8px;line-height:1.8}.format-preview{padding:12px 15px;border-left:3px solid var(--accent-line);background:var(--surface-2);font-weight:400;white-space:pre-wrap;overflow-wrap:anywhere;min-height:48px}.format-preview:empty:before{content:'文字效果预览';color:var(--faint)}.format-field .field-help{font-weight:400}
.protected-experiment{-webkit-user-select:none;user-select:none}.protected-experiment input,.protected-experiment textarea{-webkit-user-select:text;user-select:text}.protected-experiment img{-webkit-user-drag:none}
.rating-card fieldset{border:0;padding:0;margin:0;min-width:0}.rating-card fieldset:disabled{opacity:.7}.rating-idea{font-size:20px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere;padding-bottom:18px;border-bottom:1px solid var(--line);color:var(--ink)}.effort-dimension{margin-top:26px;padding:22px;background:var(--surface-2);border:1px solid var(--line);border-radius:10px}.effort-dimension>label{font-weight:600}.effort-value{text-align:center;font-family:var(--mono);font-size:28px;font-weight:600;color:var(--accent);margin:14px 0 10px;font-variant-numeric:tabular-nums}.effort-dimension input[type=range]{width:100%;height:30px;padding:0;accent-color:var(--accent);cursor:pointer}.effort-anchors{display:flex;justify-content:space-between;gap:30px;font-size:13px;line-height:1.7;color:var(--muted)}.effort-anchors>span{max-width:46%}.effort-anchors>span:last-child{text-align:right}.room-page h2,.heading h1{white-space:pre-wrap}.rating-options span strong{display:inline}.rating-options span span{display:inline}
@media(max-width:600px){.effort-dimension{padding:15px}.effort-anchors{gap:16px;font-size:12px}.format-toolbar{gap:5px}.format-toolbar button{padding:6px 8px}}
:root:fullscreen{background:var(--bg);overflow:auto}
.monitor-shade{position:fixed;inset:0;z-index:10000;background:#121722e6;display:grid;place-items:center;padding:24px}
.monitor-dialog{background:var(--surface);color:var(--ink);width:min(600px,100%);padding:36px;border-radius:16px;box-shadow:0 24px 80px #0006}
.monitor-dialog h2{font-size:23px;line-height:1.5;margin:0 0 20px}
.monitor-dialog p{font-size:16px;line-height:1.8}
.monitor-dialog button{margin-top:20px}
.material-zoom{display:block;border:0;padding:0;background:transparent;width:100%;cursor:zoom-in}
.material-full{width:100%;height:auto}
.deployment-steps{padding-left:24px;margin:20px 0}.deployment-steps li{padding:8px 0 10px 8px}.deployment-steps li::marker{color:var(--accent);font-weight:700}.deployment-steps p{margin:7px 0 0}
.site-footer{padding:18px 16px 26px;text-align:center;font-size:12px;color:var(--faint)}.site-footer a{color:inherit;text-decoration:underline;text-underline-offset:2px}.site-footer img{vertical-align:-2px}

/* ---------- Lab home page (portal) ---------- */
.portal-hero{position:relative;border-bottom:1px solid var(--line);background:var(--surface);overflow:hidden}
.portal-hero::before{content:'';position:absolute;inset:0;background-image:radial-gradient(circle,#c9cfda 1px,transparent 1.2px);background-size:22px 22px;-webkit-mask-image:linear-gradient(115deg,transparent 30%,#000 75%);mask-image:linear-gradient(115deg,transparent 30%,#000 75%);opacity:.75;pointer-events:none}
.portal-hero-inner{position:relative;max-width:1100px;margin:auto;padding:72px 28px 64px}
.portal-hero h1{font-size:44px;line-height:1.25;letter-spacing:-.8px;max-width:760px;margin:6px 0 18px}
.portal-hero h1 em{font-style:normal;color:var(--accent)}
.portal-hero p{font-size:17px;max-width:620px;margin:0;color:var(--muted)}
.portal-meta{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:30px;font-family:var(--mono);font-size:12px;color:var(--faint);letter-spacing:.04em}
.portal-section{max-width:1100px;margin:auto;padding:44px 28px 64px}
.portal-section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:20px}.portal-section-head h2{margin:0;font-size:18px}.portal-section-head span{font-family:var(--mono);font-size:12px;color:var(--faint)}
.study-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px}
.study-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;min-height:280px;transition:border-color .15s,box-shadow .15s}
a.study-card:hover{border-color:var(--accent-line);box-shadow:0 8px 28px #2f45d014}
.study-card header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.study-code{font-family:var(--mono);font-size:12px;color:var(--faint);letter-spacing:.06em}
.study-card h3{font-size:19px;line-height:1.5;margin:0 0 10px}
.study-card p{font-size:14px;line-height:1.8;margin:0 0 18px}
.study-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:22px}.study-tags span{font-size:12px;color:var(--muted);background:var(--surface-3);border:1px solid var(--line);border-radius:6px;padding:2px 8px}
.study-cta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;padding-top:16px;border-top:1px solid var(--line);font-size:14px;font-weight:600;color:var(--accent)}
.study-cta .arrow{transition:transform .15s}a.study-card:hover .study-cta .arrow{transform:translateX(3px)}
.study-card.placeholder{border-style:dashed;background:transparent;justify-content:center;align-items:flex-start;color:var(--muted)}.study-card.placeholder h3{color:var(--muted)}
.portal-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:44px;padding-top:28px;border-top:1px solid var(--line)}
.portal-notes h3{font-size:14px;margin:0 0 6px}.portal-notes p{font-size:13px;line-height:1.8;margin:0}
.portal-researcher{margin-top:36px;font-size:13px;color:var(--faint)}.portal-researcher a{color:var(--muted);text-decoration:underline;text-underline-offset:3px}
@media(max-width:720px){.portal-hero-inner{padding:48px 16px 44px}.portal-hero h1{font-size:31px}.portal-hero p{font-size:15px}.portal-section{padding:32px 16px 48px}.study-grid{grid-template-columns:1fr}.portal-notes{grid-template-columns:1fr;gap:14px}}