:root{--brand:#167256;--brand-soft:#edf6f1;--ink:#18322d;--muted:#70827b;--line:#e0e8e2;--paper:#fff;--bg:#f5f7f4;--shadow:0 16px 60px #163b2912;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:14px}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer}button:disabled{opacity:.55;cursor:not-allowed}a{color:var(--brand)}button svg{width:18px;height:18px;flex-shrink:0}button{display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn{border:0;background:var(--brand);color:white;padding:12px 18px;border-radius:10px;font-weight:650;transition:filter .2s,transform .2s}.btn:hover{filter:brightness(.94)}.btn.secondary{background:white;border:1px solid var(--line);color:var(--ink)}.btn.danger{background:#fbefed;color:#b44335}.btn.small{padding:8px 12px;font-size:12px}.icon-btn{width:34px;height:34px;border:0;background:transparent;color:var(--muted);border-radius:8px}.icon-btn:hover{background:var(--brand-soft);color:var(--brand)}.field{display:grid;gap:7px;font-size:12px;font-weight:600}.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);padding:11px 12px;min-width:0}.field textarea{resize:vertical;line-height:1.7}.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand);outline:2px solid #16725616}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-size:10px;font-weight:750;color:var(--brand)}.muted{color:var(--muted);line-height:1.75}.error{color:#b44335;line-height:1.65;font-size:12px;min-height:1em}.tag{font-size:10px;padding:4px 8px;border-radius:5px;background:var(--brand-soft);color:var(--brand);white-space:nowrap}.tag.amber{background:#fff5df;color:#9b7024}.tag.gray{background:#f0f2f0;color:#70827b}.row{display:flex;align-items:center;gap:12px}.spread{justify-content:space-between}.stack{display:grid;gap:16px}.empty{padding:35px 16px;color:var(--muted);text-align:center;line-height:1.8;font-size:13px}.boot{padding:20vh 30px;text-align:center;color:var(--muted)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);background:#173d30;color:white;padding:13px 20px;border-radius:10px;max-width:min(90vw,600px);z-index:80;opacity:0;pointer-events:none;transition:all .2s}.toast.visible{opacity:1;transform:translate(-50%,0)}
.login-page{min-height:100dvh;display:grid;grid-template-columns:1.05fr 1fr;background:white}.login-story{position:relative;display:flex;flex-direction:column;padding:55px clamp(30px,6vw,100px);background:#e9f1e8;overflow:hidden}.wordmark{font-size:22px;font-weight:750;letter-spacing:-.05em}.wordmark small{font-size:10px;letter-spacing:.13em;margin-left:12px;font-weight:500}.brand-symbol{display:inline-grid;place-items:center;background:var(--brand);color:white;width:42px;height:42px;border-radius:13px;font-family:serif;font-size:24px;font-weight:600;flex-shrink:0}.login-story h1{font-weight:500;font-size:clamp(34px,3.6vw,58px);line-height:1.4;letter-spacing:-.05em;margin:80px 0 20px;z-index:1}.login-story h1 em{font-style:normal;color:var(--brand)}.login-story>p{max-width:370px;color:#6b8071;line-height:1.9;font-size:15px;z-index:1}.story-art{display:flex;gap:16px;align-items:end;margin:50px 0 30px;transform:rotate(-6deg)}.art-card{width:130px;height:155px;border:1px solid #b8d0bc;background:#f9fcf4;border-radius:12px;padding:20px;box-shadow:0 20px 30px #4e7d3a0d}.art-card:nth-child(2){transform:translateY(-20px);background:#1c7355;color:white}.art-card svg{width:32px;height:32px;margin-bottom:25px}.art-card b{display:block;font-weight:500;font-size:13px}.art-card small{font-size:9px;opacity:.65;letter-spacing:.1em}.story-foot{margin-top:auto;font-size:11px;color:#738775;padding-top:30px}.login-form-wrap{display:flex;align-items:center;justify-content:center;padding:40px}.login-form{width:100%;max-width:370px;display:grid;gap:22px}.login-form h2{font-size:28px;font-weight:550;margin:8px 0}.login-form .intro{font-size:13px;color:var(--muted);line-height:1.8;margin:0 0 10px}.login-notice{font-size:11px;line-height:1.8;border-top:1px solid var(--line);padding-top:20px;color:var(--muted)}
.shell{display:grid;grid-template-columns:250px minmax(0,1fr);min-height:100dvh}.sidebar{background:#edf2ec;border-right:1px solid #dce5db;padding:26px 16px;display:flex;flex-direction:column;height:100dvh;position:sticky;top:0;z-index:30}.sidebar-brand{padding:0 12px 27px;gap:11px}.sidebar-brand strong{font-size:17px;font-weight:650}.sidebar-brand small{display:block;font-size:9px;letter-spacing:.12em;margin-top:4px;color:var(--muted)}.new-chat{background:white;box-shadow:0 3px 10px #1e473008;border:1px solid #d6e2d4;margin:0 4px 24px;padding:12px;border-radius:10px;color:var(--brand);font-weight:650}.nav-btn{justify-content:start;gap:12px;width:100%;border:0;background:transparent;padding:12px 15px;border-radius:9px;color:#607366;font-size:13px;margin:2px 0}.nav-btn.active{background:#dce9dc;color:var(--brand);font-weight:650}.side-label{font-size:10px;color:#869789;letter-spacing:.09em;padding:25px 15px 10px}.chat-list{overflow-y:auto;min-height:60px;flex:1;scrollbar-width:thin}.chat-item{display:flex;align-items:center;gap:2px;margin:3px 2px;border-radius:7px}.chat-item.active{background:#dfe9dd}.chat-open{display:block;flex:1;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;color:#68806d;background:transparent;border:0;padding:11px 12px}.chat-item .delete-chat{opacity:0;width:28px;flex-shrink:0}.chat-item:hover .delete-chat,.chat-item:focus-within .delete-chat{opacity:1}.sidebar-bottom{border-top:1px solid #d7e2d5;padding-top:18px;margin-top:15px}.account-button{width:100%;justify-content:start;background:transparent;border:0;padding:8px;color:var(--ink);text-align:left}.avatar{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#d8e6d6;color:var(--brand);font-size:12px}.account-button small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.side-version{font-size:9px;color:#8a9b8e;display:flex;justify-content:space-between;padding:16px 9px 0}
.workspace{min-width:0;display:flex;flex-direction:column;height:100dvh}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 38px;border-bottom:1px solid #e8ede5;background:#fafcf8;flex-shrink:0}.school-name{font-size:12px;font-weight:650}.top-meta{font-size:11px;color:var(--muted)}.status-dot{width:5px;height:5px;display:inline-block;background:#76a87b;border-radius:50%;margin-right:6px}.mobile-menu{display:none}.view{flex:1;min-height:0;overflow:auto}.chat-view{height:100%;display:flex;flex-direction:column;position:relative}.chat-toolbar{padding:20px 38px;display:flex;align-items:center;justify-content:space-between;gap:15px}.model-picker{border:1px solid var(--line);background:#fff;border-radius:8px;color:var(--ink);padding:9px 34px 9px 12px;font-size:12px;max-width:250px}.quota-pill{display:flex;align-items:center;gap:8px;font-size:10px;color:var(--muted)}.quota-pill b{font-weight:650;color:var(--brand)}.message-area{flex:1;min-height:0;overflow:auto;padding:5px max(25px,calc((100% - 800px)/2));scroll-behavior:smooth}.welcome{max-width:650px;margin:10vh auto 40px;text-align:center}.welcome-mark{width:64px;height:64px;border-radius:23px;background:#e6efe2;color:var(--brand);display:grid;place-items:center;margin:0 auto 24px}.welcome-mark svg{width:35px;height:35px}.welcome h1{font-size:32px;letter-spacing:-.04em;font-weight:520;margin:12px 0}.welcome p{font-size:13px;color:var(--muted);line-height:1.9}.prompt-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:35px}.prompt-card{display:flex;flex-direction:column;align-items:flex-start;justify-content:start;text-align:left;gap:12px;padding:18px;background:white;border:1px solid var(--line);border-radius:12px;color:var(--ink);font-size:11px;line-height:1.7}.prompt-card svg{color:var(--brand);width:19px;height:19px}.prompt-card:hover{border-color:#9cbaa3;transform:translateY(-2px)}.message{display:flex;gap:13px;margin:25px 0;line-height:1.9;font-size:14px}.message .message-avatar{width:27px;height:27px;display:grid;place-items:center;border-radius:8px;background:#e2eddf;color:var(--brand);flex-shrink:0;font-size:12px}.message-body{min-width:0;flex:1}.message-label{font-size:10px;color:var(--muted);margin-bottom:7px}.message-text{white-space:pre-wrap;overflow-wrap:anywhere}.message.user{justify-content:flex-end}.message.user .message-avatar{display:none}.message.user .message-body{flex:0 1 auto;max-width:85%;background:#e9f0e5;padding:13px 18px;border-radius:15px 15px 3px 15px}.message.user .message-label{display:none}.message-status{margin-top:10px;font-size:10px;color:#9a812f}.streaming .message-text:after{content:"";display:inline-block;width:5px;height:15px;background:var(--brand);margin-left:4px;animation:pulse 1s infinite}.composer-wrap{padding:15px max(25px,calc((100% - 800px)/2)) 15px;background:linear-gradient(transparent,var(--bg) 20%);flex-shrink:0}.composer{background:white;border:1px solid #d5e2d5;border-radius:15px;box-shadow:0 4px 18px #274d2f06;padding:15px 16px 11px}.composer:focus-within{border-color:#7eab8a;box-shadow:0 0 0 3px #16725608}.composer textarea{width:100%;border:0;resize:none;outline:none;background:transparent;min-height:48px;max-height:160px;padding:2px;font-size:13px;line-height:1.7;color:var(--ink)}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px}.composer-hint{font-size:10px;color:#8a9b8e}.send-button{background:var(--brand);border:0;border-radius:8px;color:white;width:35px;height:35px}.stop-button{background:#f5e4df;color:#a24736;border:0;padding:9px 14px;border-radius:8px;font-size:12px}.disclaimer{font-size:9px;text-align:center;color:#96a18f;margin:9px 0 0;line-height:1.5}.api-notice{margin:0 38px 10px;border:1px solid #eadfc7;background:#fbf7ed;padding:10px 14px;border-radius:8px;color:#8b7545;font-size:11px;line-height:1.7}.connection-status{font-size:10px;color:var(--muted)}
.page{padding:35px 38px 60px;max-width:1250px;margin:0 auto}.page-heading{margin-bottom:28px}.page-heading h1{font-size:25px;font-weight:550;letter-spacing:-.04em;margin:8px 0 12px}.page-heading p{font-size:12px;color:var(--muted);line-height:1.8}.panel{background:white;border:1px solid var(--line);border-radius:13px;padding:22px;min-width:0}.panel h2{font-size:15px;font-weight:650;margin:0 0 7px}.panel .sub{font-size:11px;color:var(--muted);line-height:1.7;margin:0 0 20px}.teacher-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:20px}.upload-zone{display:block;position:relative;border:1px dashed #b5ccb6;border-radius:10px;text-align:center;padding:24px 12px;background:#f7faf4;cursor:pointer}.upload-zone svg{width:25px;height:25px;color:var(--brand);margin-bottom:10px}.upload-zone b{display:block;font-size:12px;font-weight:600}.upload-zone small{display:block;font-size:10px;color:var(--muted);margin-top:8px}.upload-zone input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%}.document-row{display:flex;align-items:center;gap:10px;padding:14px 0;border-bottom:1px solid #edf0ea}.document-row:last-child{border-bottom:0}.document-row input{accent-color:var(--brand);width:16px;height:16px}.document-name{flex:1;min-width:0}.document-name strong{font-size:12px;font-weight:550;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.document-name small{display:block;font-size:10px;color:var(--muted);margin-top:5px}.workstep{display:flex;align-items:center;gap:10px;margin-bottom:18px}.step-badge{width:25px;height:25px;border:1px solid #b4cfb7;border-radius:50%;display:grid;place-items:center;color:var(--brand);font-size:10px}.artifact-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin-top:18px}.artifact-card{text-align:left;align-items:stretch;justify-content:space-between;flex-direction:column;border:1px solid var(--line);border-radius:11px;background:white;padding:18px;gap:18px;color:var(--ink)}.artifact-card h3{font-size:13px;font-weight:600;line-height:1.6;margin:0}.artifact-card small{color:var(--muted);font-size:10px}.section-head{margin-top:30px;display:flex;justify-content:space-between;align-items:center}.section-head h2{font-size:16px;font-weight:600}.admin-tabs{display:flex;gap:7px;margin-bottom:25px;flex-wrap:wrap}.admin-tabs button{border:1px solid var(--line);border-radius:8px;background:white;color:var(--muted);padding:9px 17px;font-size:12px}.admin-tabs button.active{color:var(--brand);background:var(--brand-soft);border-color:#a9c9b0}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-bottom:22px}.stat{background:white;border:1px solid var(--line);border-radius:12px;padding:23px}.stat small{font-size:10px;color:var(--muted)}.stat b{display:block;font-size:28px;font-weight:500;margin-top:12px;letter-spacing:-.04em}.table-wrap{width:100%;overflow:auto}table{width:100%;border-collapse:collapse;white-space:nowrap;text-align:left;font-size:11px}th{font-weight:500;color:var(--muted);padding:13px 12px;background:#f7f9f4}td{padding:15px 12px;border-bottom:1px solid #edf0ea}tbody tr:last-child td{border-bottom:0}.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.budget-controls{display:grid;gap:20px}.mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.form-footer{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}
dialog{border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:25px;width:min(680px,calc(100vw - 25px));max-height:90dvh;color:var(--ink);overflow:auto;background:#fafcf8}dialog::backdrop{background:#18352b55;backdrop-filter:blur(3px)}dialog.wide{width:min(1100px,calc(100vw - 25px))}.dialog-heading{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:23px;gap:15px}.dialog-heading h2{font-size:20px;font-weight:550;margin:0}.dialog-heading .eyebrow{display:block;margin-bottom:8px}.source-block{border-left:2px solid #b2cdb3;padding:5px 15px;margin:20px 0;line-height:1.8;font-size:12px}.source-block h3{font-size:11px;font-weight:650}.source-block p{white-space:pre-wrap;overflow-wrap:anywhere;color:#617668}.editor-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:24px}.editor-area{height:52vh;min-height:280px;line-height:1.8;font-size:12px}.evidence-list{max-height:60vh;overflow:auto}.checklabel{display:flex;align-items:center;gap:9px;font-size:11px;color:var(--muted)}.checklabel input{accent-color:var(--brand)}.overlay{display:none}
@keyframes pulse{50%{opacity:.2}}@media(min-width:1400px){.welcome{margin-top:5vh}.message-area{padding-left:max(50px,calc((100% - 800px)/2));padding-right:max(50px,calc((100% - 800px)/2))}}@media(max-width:1050px){.shell{grid-template-columns:220px minmax(0,1fr)}.sidebar{padding:25px 10px}.topbar{padding:0 24px}.page{padding:27px 24px}.chat-toolbar{padding:17px 24px}.teacher-grid{grid-template-columns:1fr}.artifact-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-grid{grid-template-columns:1fr}.prompt-grid{gap:7px}.prompt-card{padding:13px}.login-story{padding:40px}.login-story h1{margin-top:65px}}@media(max-width:760px){.login-page{grid-template-columns:1fr}.login-story{display:none}.login-form-wrap{padding:34px 25px}.login-form{max-width:370px}.shell{display:block}.sidebar{position:fixed;left:0;top:0;width:255px;transform:translateX(-100%);transition:transform .2s}.shell.menu-open .sidebar{transform:translateX(0)}.shell.menu-open .overlay{display:block;position:fixed;inset:0;background:#193c2d55;z-index:25}.workspace{height:100dvh}.mobile-menu{display:flex}.topbar{height:64px;padding:0 16px}.top-meta{font-size:9px}.school-name{font-size:11px;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-toolbar{padding:15px 17px}.model-picker{max-width:185px;font-size:11px;padding:8px}.quota-pill{font-size:9px}.quota-pill span{display:none}.api-notice{margin:0 17px 8px;font-size:10px}.welcome{margin:3vh auto 20px}.welcome h1{font-size:26px}.welcome p{font-size:11px;padding:0 15px}.welcome-mark{width:54px;height:54px;border-radius:18px}.message-area{padding:0 18px}.message{font-size:13px;gap:8px}.message.user .message-body{max-width:90%}.prompt-grid{grid-template-columns:1fr;margin:24px 0 0}.prompt-card{padding:12px 15px;flex-direction:row;align-items:center;gap:12px;font-size:11px}.prompt-card svg{flex-shrink:0}.composer-wrap{padding:12px 15px 14px}.composer-hint{font-size:9px}.composer textarea{font-size:13px}.page{padding:25px 17px 40px}.page-heading h1{font-size:23px}.panel{padding:18px}.artifact-grid{grid-template-columns:1fr 1fr;gap:10px}.artifact-card{padding:13px}.artifact-card h3{font-size:12px}.stat-grid{gap:8px}.stat{padding:15px 11px}.stat b{font-size:22px}.stat small{font-size:9px}.mini-grid{grid-template-columns:1fr}.editor-grid{grid-template-columns:1fr}.editor-area{height:42vh}.evidence-list{max-height:200px}.dialog-heading h2{font-size:17px}dialog{padding:20px}.chat-item .delete-chat{opacity:1}.disclaimer{font-size:9px}.field{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}