:root{--platform-ink:#172a31;--platform-accent:#21665c;--platform-line:#d9e3df;--platform-paper:#f6f8f4;--platform-muted:#62736f}
[hidden]{display:none!important}*{box-sizing:border-box}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:wait}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #68a897;outline-offset:3px}
.login-page{margin:0;background:var(--platform-paper);color:var(--platform-ink);font:16px/1.65 system-ui,sans-serif}.login-layout{display:grid;grid-template-columns:1.2fr 1fr;max-width:1200px;margin:auto;min-height:100vh;align-items:center;padding:70px 40px;gap:90px}.login-story h1{font:normal clamp(44px,6vw,76px)/1.07 Georgia,serif;letter-spacing:-2px;margin:32px 0}.login-story>p:not(.eyebrow){color:var(--platform-muted)}.eyebrow{font:600 11px/1.5 system-ui,sans-serif;letter-spacing:1.8px;color:var(--platform-accent)}.login-card{background:white;border:1px solid var(--platform-line);border-radius:18px;padding:38px;box-shadow:0 15px 60px #172a3107}.login-card h2{font:normal 28px/1.25 Georgia,serif;margin:18px 0}.login-card p{font-size:14px}.login-card label{display:block;font-size:13px;margin:18px 0}.login-card input{display:block;width:100%;padding:13px;border:1px solid var(--platform-line);border-radius:7px;background:#fafcf9;margin-top:7px}.login-card button{border:0;border-radius:7px;width:100%;padding:14px;margin-top:10px;background:var(--platform-ink);color:white}.muted{color:var(--platform-muted)}#login-error,.platform-error{color:#9c362c;white-space:pre-wrap}.login-diagram{display:flex;align-items:center;gap:9px;margin:45px 0}.login-diagram span{border:1px solid #cddad4;background:white;border-radius:7px;padding:14px 15px;font-size:21px}.login-diagram .sorted{background:#dceee4;border-color:#b9d7c6;color:#246753}.login-diagram i{font-style:normal;margin:0 8px}.login-caption{font-size:12px!important}
.account-bar{display:flex;align-items:center;gap:10px;margin-left:auto;flex-wrap:wrap}.account-bar button{font-size:12px}.credit-pill{border:1px solid #bcd5c7;background:#edf6ef;color:#245e48;padding:6px 11px;border-radius:30px;font-size:12px;white-space:nowrap}.platform-lead{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin:15px 0 32px}.platform-lead h1{font:normal 44px/1.15 Georgia,serif;margin:12px 0}.platform-lead p{max-width:660px;color:var(--platform-muted)}.platform-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:26px}.platform-card{border:1px solid var(--platform-line);border-radius:12px;padding:24px;background:white}.platform-card h2,.platform-card h3{margin-top:0;padding-top:0}.context-card{align-self:start;position:sticky;top:140px}.context-card select,.platform-card input,.platform-card select,.platform-card textarea{max-width:100%;width:100%;padding:10px;border:1px solid var(--platform-line);border-radius:6px;margin:6px 0 14px;background:white;color:var(--platform-ink)}.context-card p{font-size:13px}.chat-log{min-height:310px;max-height:570px;overflow-y:auto;padding:20px;background:#f7faf7;border-radius:9px;scroll-behavior:smooth}.chat-message{max-width:94%;padding:14px 17px;margin:0 0 16px;border:1px solid var(--platform-line);border-radius:12px;background:white;overflow-wrap:anywhere;line-height:1.7;font-size:15px}.chat-message.user{background:#e4f0e8;margin-left:auto;border-color:#cadece}.chat-message strong.speaker{display:block;font-size:10px;letter-spacing:1px;color:#59816b;margin-bottom:8px}.chat-message p{margin:8px 0}.chat-message pre{background:#162c30;color:#eef7ec;padding:14px;border-radius:8px;white-space:pre-wrap;overflow:auto}.chat-empty{text-align:center;padding:65px 20px;color:var(--platform-muted)}.chat-empty h2{font:normal 29px Georgia,serif}.chat-prompts{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.chat-prompts button{font-size:12px;background:#f7faf7}.chat-compose{margin-top:20px}.chat-compose textarea{resize:vertical;min-height:100px;margin-bottom:0}.chat-compose .actions{justify-content:space-between}.chat-compose small{color:var(--platform-muted)}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:20px 0}.stat-card{padding:20px;border:1px solid var(--platform-line);background:white;border-radius:10px}.stat-card span{font-size:12px;color:var(--platform-muted)}.stat-card strong{display:block;font-size:28px;font-weight:500;margin-top:10px}.admin-create{display:grid;grid-template-columns:1fr 1fr 130px auto;gap:14px;align-items:end}.admin-create input{margin-bottom:0}.admin-list{display:grid;gap:12px;margin:20px 0}.user-row{display:grid;grid-template-columns:minmax(170px,1fr) 170px minmax(300px,1.5fr);gap:20px;align-items:center;border:1px solid var(--platform-line);padding:18px;border-radius:9px;background:#fff}.user-row p{margin:4px 0;font-size:12px;color:var(--platform-muted)}.user-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.user-actions input{width:88px;margin:0}.user-actions button{font-size:12px}.usage-list{max-height:450px;overflow:auto}.usage-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px;padding:13px 0;border-bottom:1px solid var(--platform-line);font-size:13px}.usage-row small{display:block;color:var(--platform-muted)}.password-form{max-width:430px}.platform-status{min-height:24px;font-size:13px}.lesson-extra{padding:20px;border-left:3px solid #a8c7b6;background:#f4f8f2;margin:24px 0}.lesson-extra h4{margin:0 0 10px}.answer-body>p{white-space:pre-line}.lesson-extra p{margin:10px 0}.lab-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:24px}.lab-stage{min-height:300px;background:#f4f8f2;border:1px solid var(--platform-line);border-radius:10px;padding:16px}.lab-stage svg{width:100%;height:auto;display:block}.lab-blocks{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:40px 0}.lab-block{padding:20px 24px;border-radius:8px;background:#dbe9f0;border:2px solid transparent;font-size:25px;transition:background .2s}.lab-block.active{background:#fbe4c1;border-color:#c68b3b}.lab-block.done{background:#d4ebd8}.lab-flow{display:grid;gap:9px}.flow-item{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--platform-line);border-radius:7px;background:white}.flow-item span{flex:1}.flow-item.current{border-color:#7cab8d;background:#e5f2e5}.flow-item button{padding:5px 10px;min-height:32px}.lab-note{min-height:100px;line-height:1.7}.lab-trace{font:13px/1.6 ui-monospace,monospace;white-space:pre-wrap;color:#536c60}.lab-controls{display:flex;gap:10px;flex-wrap:wrap}.lab-controls label{flex:1;min-width:150px}.lab-stage text{font-family:system-ui,sans-serif}.lab-step-label{font-size:12px;color:var(--platform-muted)}
@media(max-width:950px){.login-layout{gap:35px}.platform-grid,.lab-grid{grid-template-columns:1fr}.context-card{position:static;grid-row:1}.user-row{grid-template-columns:1fr 1fr}.user-actions{grid-column:1/-1}.admin-create{grid-template-columns:1fr 1fr}.stat-grid{grid-template-columns:1fr 1fr}.app-header{position:static!important}.account-bar{margin-left:0}.login-diagram{gap:5px}.login-diagram span{padding:10px}}
@media(max-width:600px){.login-layout{display:block;padding:30px 20px}.login-story{margin-bottom:30px}.login-story h1{font-size:44px;margin:20px 0}.login-diagram,.login-caption{display:none}.login-card{padding:24px}.platform-lead{display:block}.platform-lead h1{font-size:34px}.platform-card{padding:16px}.admin-create{grid-template-columns:1fr}.usage-row{grid-template-columns:1fr 1fr}.usage-row> :last-child{grid-column:1/-1}.chat-log{padding:10px}.chat-message{max-width:100%;font-size:14px}.lab-block{padding:14px}.stat-card{padding:15px}.stat-card strong{font-size:23px}}
@media print{.account-bar,#chat,#admin,#account,#lab{display:none!important}.lesson-extra{break-inside:avoid}}