/* Da Fu: shared light/dark and embedded layouts. */
#header .logo-icon.dafu-brand{width:44px;height:44px;overflow:hidden;border-radius:15px;background:var(--brand-primary-light);border:1px solid var(--border);cursor:default}
#header .dafu-brand img{position:absolute;width:112px;height:112px;max-width:none;left:-42px;top:-4px;object-fit:contain}
.message.assistant .avatar:has(.dafu-face){overflow:hidden;position:relative;border-radius:50%;background:var(--brand-primary-light);width:38px;height:38px;flex-shrink:0}
.message.assistant .avatar .dafu-face{position:absolute;width:104px;height:104px;max-width:none;left:-40px;top:-4px;object-fit:contain;border-radius:0}
#launcher .dafu-launcher{width:100%;height:100%;object-fit:contain;margin:0}
#messages.dafu-empty{container-type:inline-size;padding:20px 24px;display:block}
.dafu-welcome{--df-panel:#202e46;--df-soft:#1b2538;--df-ink:#edf4ff;--df-muted:#b3c2d8;--df-line:#334965;width:min(100%,1040px);margin:0 auto}
.light .dafu-welcome,.light .dafu-tutorial-hero{--df-panel:#edf4fe;--df-soft:#f7faff;--df-ink:#203e65;--df-muted:#62768f;--df-line:#dbe7f5}
.dafu-hero{position:relative;display:grid;grid-template-columns:1.3fr 1fr;align-items:center;min-height:300px;border-radius:24px;background:linear-gradient(120deg,var(--df-panel),var(--df-soft));border:1px solid var(--df-line);padding:28px 32px 0;isolation:isolate;overflow:hidden}
.dafu-intro{padding-bottom:28px;z-index:1}
.dafu-eyebrow{display:block;font-size:11px;letter-spacing:.08em;color:var(--accent);font-weight:600;margin-bottom:10px}
.dafu-intro h1{font-size:29px;font-weight:650;line-height:1.4;letter-spacing:-.02em;color:var(--df-ink);margin:0 0 8px}
.dafu-intro h1 span{white-space:nowrap;color:var(--accent)}
.dafu-lead{font-size:22px;font-weight:600;line-height:1.55;color:var(--df-ink);margin-bottom:12px}
.dafu-description{color:var(--df-muted);font-size:13px;line-height:1.8}
.dafu-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.dafu-actions button{font:inherit;font-size:12px;border-radius:9px;border:1px solid var(--df-line);padding:10px 13px;background:var(--bg);color:var(--df-ink);cursor:pointer;min-height:40px}
.dafu-actions button:first-child{background:var(--accent2);border-color:var(--accent2);color:#fff}
.dafu-actions button span{margin-left:12px}
.dafu-hero-art{position:relative;align-self:end;height:315px;display:flex;justify-content:center;align-items:end}
.dafu-hero-art img{position:relative;width:350px;max-width:none;height:350px;object-fit:contain;z-index:1;display:block}
.dafu-orbit{position:absolute;width:270px;height:270px;bottom:14px;left:50%;transform:translateX(-50%);background:radial-gradient(circle,#83b8fb33,#7eaafb0a);border:1px solid #82b6f533;border-radius:50%}
.dafu-topics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:16px}
.dafu-topics button{display:flex;gap:10px;align-items:flex-start;text-align:left;min-width:0;position:relative;padding:16px 12px;border:1px solid var(--border);background:var(--ai-msg);color:var(--text);border-radius:13px;cursor:pointer;font:inherit;transition:border-color .15s,background .15s}
.dafu-topics button:hover{border-color:var(--accent);background:var(--brand-primary-light)}
.dafu-topic-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:30px;height:30px;border-radius:9px;color:var(--accent);background:var(--brand-primary-light)}
.dafu-topic-icon svg{width:18px;height:18px}
.dafu-topics b{display:block;font-size:13px;font-weight:600;margin-bottom:5px}
.dafu-topics small{display:block;font-size:11px;line-height:1.65;color:var(--df-muted)}
.dafu-topic-arrow{display:none}
.dafu-steps{display:flex;flex-wrap:wrap;justify-content:center;gap:24px;margin-top:20px;color:var(--df-muted);font-size:11px}
.dafu-steps i{font-style:normal;color:var(--accent);font-weight:600;margin-right:6px}
.dafu-note{font-size:10px;text-align:center;color:var(--df-muted);margin:14px 0 2px;line-height:1.7}
.dafu-welcome button:focus-visible,.dafu-tutorial-backdrop:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.tutorial-panel{width:min(430px,100vw);max-width:100%;z-index:12001;background:var(--bg)}
.tutorial-header{min-height:60px;padding:12px 20px}
.tutorial-header button{min-width:40px;min-height:36px;font-size:20px;border-radius:8px;background:var(--hover)}
.tutorial-body{padding:16px 20px 28px;overscroll-behavior:contain}
.dafu-tutorial-backdrop{position:fixed;inset:0;z-index:12000;background:rgba(13,25,46,.38);border:0;cursor:default;backdrop-filter:blur(2px)}
.dafu-tutorial-backdrop[hidden]{display:none}
.dafu-tutorial-hero{--df-panel:#202e46;--df-soft:#1b2538;--df-ink:#edf4ff;--df-muted:#b3c2d8;--df-line:#334965;position:relative;isolation:isolate;background:linear-gradient(130deg,var(--df-panel),var(--df-soft));border:1px solid var(--df-line);border-radius:18px;margin:60px 0 18px;padding:20px 15px;min-height:162px;overflow:visible}
.dafu-tutorial-hero>img{position:absolute;right:-8px;bottom:0;width:230px;height:230px;object-fit:contain;object-position:bottom;z-index:-1;pointer-events:none}
.dafu-tutorial-hero>div{max-width:190px;padding-right:24px}
.dafu-tutorial-hero .dafu-eyebrow{font-size:10px;letter-spacing:0}
.dafu-tutorial-hero h2{font-size:18px;line-height:1.55;color:var(--df-ink);margin:0 0 10px}
.dafu-tutorial-hero p{font-size:11px;line-height:1.85;color:var(--df-muted)}
.tutorial-tip{color:var(--text);background:var(--brand-primary-light);border-color:var(--border);font-size:12px;padding:12px}
.tutorial-section{margin:22px 0}
.tutorial-section h3{font-size:13px}
.tutorial-item{padding:11px 10px;gap:12px;font-size:12px;line-height:1.6}
.tutorial-item button{min-height:34px;border-radius:7px;padding:4px 9px;font-size:11px}
.v2-summary-dialog>header h3{display:flex;align-items:center;gap:8px}
.v2-summary-dialog>header h3:before{content:'';display:block;width:40px;height:44px;flex-shrink:0;background:url('/static/dafu-v1/success.webp') center 10%/75px auto no-repeat}
@container (max-width:780px){
 .dafu-hero{padding:22px 24px 0;grid-template-columns:1.35fr 1fr;min-height:270px}
 .dafu-intro h1{font-size:24px}.dafu-lead{font-size:19px}.dafu-hero-art{height:275px}.dafu-hero-art img{width:295px;height:295px}
 .dafu-topics{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@container (max-width:520px){
 .dafu-hero{padding:20px 18px 0;display:block;min-height:280px;border-radius:18px}
 .dafu-intro{padding-bottom:18px}.dafu-eyebrow{font-size:9px;letter-spacing:0}.dafu-intro h1{font-size:23px;max-width:80%;margin-bottom:13px}.dafu-intro h1 span{display:block}
 .dafu-lead{font-size:17px;max-width:65%;margin-bottom:10px}.dafu-description{font-size:11px;max-width:63%}.dafu-description br{display:none}
 .dafu-hero-art{position:absolute;right:-28px;bottom:49px;height:190px;width:190px;z-index:-1}.dafu-hero-art img{width:205px;height:205px}.dafu-orbit{width:160px;height:160px;bottom:2px}
 .dafu-actions{gap:7px;margin-top:19px}.dafu-actions button{padding:8px 10px;font-size:11px}.dafu-actions button span{margin-left:4px}
 .dafu-topics{gap:8px;margin-top:12px}.dafu-topics button{padding:12px 10px;gap:8px}.dafu-topics b{font-size:12px}.dafu-topics small{font-size:10px}.dafu-topic-icon{width:26px;height:26px}
 .dafu-steps{gap:10px;font-size:10px;margin-top:15px}.dafu-note{margin-top:10px;font-size:9px}
}
@media(max-width:600px){
 #messages.dafu-empty{padding:12px}
 #header{height:auto;min-height:100px;padding:8px 12px;gap:7px;flex-direction:column;align-items:stretch}
 #header .header-left{gap:7px}#header .logo-text{font-size:14px}
 #header .header-right{min-width:0;flex-shrink:1;gap:0}#header .student-label{display:none}
 #header .student-selectors{width:100%;display:grid;grid-template-columns:80px minmax(0,1fr) 74px;gap:6px}
 #header .hdr-select,#header .hdr-subject-area,#header .hdr-score-wrap{width:100%;min-width:0}
 #header .hdr-select select,#header .hdr-score-wrap input{width:100%;min-width:0;font-size:12px}
 #header .hdr-score-wrap{gap:3px;padding:4px 6px}#header .hdr-score-wrap input{flex:1;appearance:textfield;-moz-appearance:textfield}#header .hdr-score-wrap input::-webkit-inner-spin-button,#header .hdr-score-wrap input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}#header .hdr-score-wrap .score-unit{font-size:11px}
 #header .hdr-subject-text{font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
 #header .logo-icon.dafu-brand{width:30px;height:30px;border-radius:10px}
 #header .dafu-brand img{width:84px;height:84px;left:-33px;top:-2px}
 .tutorial-body{padding:12px 16px 24px}.dafu-tutorial-hero>img{width:220px;height:220px;right:-8px}.dafu-tutorial-hero>div{max-width:180px}.dafu-tutorial-hero h2{font-size:17px}
}
@media(prefers-reduced-motion:reduce){.dafu-topics button{transition:none}}
@container (max-width:340px){
 .dafu-hero-art{width:150px;height:170px;right:-18px;bottom:65px}.dafu-hero-art img{width:170px;height:170px}.dafu-orbit{width:140px;height:140px}
 .dafu-description{max-width:58%}.dafu-intro h1{font-size:22px}
 .dafu-topics button{gap:6px;padding:11px 8px}.dafu-topic-icon{width:23px;height:23px}
}
@media(max-width:360px){
 .dafu-tutorial-hero>img{width:170px;height:170px;right:-5px;top:-48px;bottom:auto}
 .dafu-tutorial-hero>div{max-width:none;padding:108px 0 0}
 .dafu-tutorial-hero .dafu-eyebrow{position:absolute;top:20px;left:15px;max-width:100px}
}
/* Intent-first new conversation entries. */
.dafu-entry-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:23px 2px 12px}.dafu-entry-heading h2{font-size:16px;font-weight:650;color:var(--text);margin:0}.dafu-entry-heading>span{font-size:12px;color:var(--sub)}
.dafu-topics{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:0;gap:10px}.dafu-topics button{align-items:center;padding:14px 15px;min-height:80px}.dafu-topics b{font-size:14px}.dafu-topics small{font-size:12px}.dafu-topic-icon{width:36px;height:36px;border-radius:11px}.dafu-topic-icon svg{width:21px;height:21px}.dafu-topic-arrow{display:block;margin-left:auto;color:var(--sub);font-size:16px}.dafu-topics button[data-dafu-start=plan]{border-color:var(--accent);background:var(--brand-primary-light)}
.dafu-tool-link{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px;font-size:12px;color:var(--sub)}.dafu-tool-link button{background:none;border:0;color:var(--accent);font:inherit;cursor:pointer;padding:8px 0;white-space:nowrap}.dafu-steps{margin-top:14px}
.dafu-start-dialog{box-sizing:border-box;width:min(880px,calc(100vw - 32px));max-width:none;max-height:calc(100dvh - 40px);margin:auto;padding:0;border:1px solid var(--border);border-radius:22px;background:var(--bg);color:var(--text);box-shadow:0 24px 100px #031c3d55;overflow:auto}.dafu-start-dialog::backdrop{background:#12244080;backdrop-filter:blur(3px)}.dafu-start-dialog *{box-sizing:border-box}.ds-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 24px;border-bottom:1px solid var(--border)}.ds-header small{font-size:11px;color:var(--accent)}.ds-header h2{font-size:22px;margin:5px 0 0}.ds-header button{font-size:24px;width:38px;height:38px;border:0;border-radius:12px;background:var(--hover);color:var(--text);cursor:pointer}.ds-layout{display:grid;grid-template-columns:230px minmax(0,1fr)}.ds-layout aside{padding:20px;background:var(--brand-primary-light);border-right:1px solid var(--border);font-size:13px;line-height:1.8}.ds-layout aside img{display:block;width:180px;height:170px;object-fit:contain;margin:-12px auto 8px}.ds-layout aside b{font-size:16px}.ds-layout aside p{color:var(--sub);margin:10px 0 20px}.ds-layout aside ol{list-style:none;padding:0;margin:16px 0 24px;font-size:12px;color:var(--sub)}.ds-layout aside li{padding:8px 10px;border-radius:8px}.ds-layout aside li.active{color:var(--accent);background:var(--bg);font-weight:600}.ds-layout aside small{font-size:11px;color:var(--sub)}.ds-content{padding:22px 24px;min-width:0}.ds-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.ds-field{display:block;font-size:12px;color:var(--text);font-weight:550;margin-bottom:16px}.ds-field em,.ds-choices em{font-style:normal;color:#c34545}.ds-field input,.ds-field select,.ds-field textarea{display:block;width:100%;min-width:0;margin-top:7px;border:1px solid var(--border);border-radius:9px;padding:10px 11px;background:var(--input-bg);color:var(--text);font:inherit;font-size:13px;line-height:1.65;outline:none}.ds-field textarea{resize:vertical}.ds-field :is(input,select,textarea):focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--brand-primary-light)}.ds-choices{padding:0;border:0;margin:0 0 17px;display:flex;flex-wrap:wrap;gap:7px}.ds-choices legend{font-size:12px;font-weight:550;margin-bottom:9px}.ds-choices label{cursor:pointer;position:relative}.ds-choices input{position:absolute;opacity:0;width:1px;height:1px}.ds-choices span{display:block;padding:7px 11px;background:var(--input-bg);border:1px solid var(--border);color:var(--sub);font-size:12px;border-radius:8px}.ds-choices input:checked+span{border-color:var(--accent);background:var(--brand-primary-light);color:var(--accent);font-weight:600}.ds-choices input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}.ds-muted{font-size:12px;color:var(--sub);line-height:1.75;margin:0 0 15px}.ds-error{font-size:12px;line-height:1.7;color:var(--red,#c43f3f);margin:8px 0;min-height:4px}.ds-content footer{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:9px;border-top:1px solid var(--border);padding-top:16px;margin-top:16px}.ds-content footer button{font:inherit;font-size:12px;border:1px solid var(--border);background:var(--input-bg);color:var(--text);padding:10px 14px;border-radius:9px;cursor:pointer;min-height:40px}.ds-content footer button.primary{color:#fff;background:var(--accent2);border-color:var(--accent2)}.dafu-start-dialog button:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.ds-destination{padding:0 0 15px}.ds-destination>span{display:inline-block;color:var(--accent);background:var(--brand-primary-light);padding:4px 8px;border-radius:6px;font-size:11px;margin-right:10px}.ds-destination b{font-size:15px}.ds-destination p{font-size:12px;color:var(--sub);margin:12px 0 0}.ds-preview{min-height:240px}.ds-needs{display:grid;gap:10px}.ds-needs button{text-align:left;position:relative;font:inherit;padding:15px 35px 15px 14px;border:1px solid var(--border);background:var(--ai-msg);color:var(--text);border-radius:12px;cursor:pointer}.ds-needs button:hover{border-color:var(--accent)}.ds-needs b{display:block;font-size:13px;margin-bottom:7px}.ds-needs small{display:block;font-size:12px;color:var(--sub);line-height:1.7}.ds-needs span{position:absolute;right:14px;top:20px;color:var(--accent)}
@container(max-width:780px){.dafu-topics{grid-template-columns:repeat(2,minmax(0,1fr))}.dafu-topics button{padding:12px;gap:9px}.dafu-topic-arrow{display:none}.dafu-topics small{font-size:11px}}
@container(max-width:520px){.dafu-entry-heading{display:block;margin-top:19px}.dafu-entry-heading h2{font-size:15px;margin-bottom:6px}.dafu-entry-heading>span{font-size:11px}.dafu-topics button{padding:12px 10px;align-items:flex-start;min-height:94px}.dafu-topics b{font-size:12px}.dafu-topic-icon{width:26px;height:26px}.dafu-topic-icon svg{width:17px;height:17px}.dafu-topics small{font-size:11px}.dafu-tool-link{display:block;font-size:11px}.dafu-tool-link button{display:block}}
@media(max-width:680px){.dafu-start-dialog{width:calc(100vw - 20px);max-height:calc(100dvh - 20px);border-radius:16px}.ds-header{padding:15px 17px}.ds-header h2{font-size:19px}.ds-layout{display:block}.ds-layout aside{position:relative;padding:13px 90px 13px 17px;border-right:0;border-bottom:1px solid var(--border);min-height:90px}.ds-layout aside img{position:absolute;width:110px;height:110px;right:0;bottom:0;margin:0}.ds-layout aside b{font-size:13px}.ds-layout aside p{font-size:11px;line-height:1.7;margin:5px 0 0}.ds-layout aside ol,.ds-layout aside>small{display:none}.ds-content{padding:17px}.ds-grid{gap:10px}.ds-field input,.ds-field select,.ds-field textarea{font-size:14px}.ds-content footer button{flex:1;white-space:nowrap;padding:10px 8px}.ds-preview{min-height:220px}.ds-choices span{min-height:36px}.ds-choices legend{line-height:1.7}}

.dafu-start-dialog .ds-header{position:sticky;top:0;z-index:3;background:var(--bg)}