@font-face{font-family:'Golos Text';src:url('fonts/GolosText.ttf') format('truetype');font-weight:400 900;font-style:normal;font-display:swap}
@font-face{font-family:Manrope;src:url('fonts/Manrope.ttf') format('truetype');font-weight:200 800;font-style:normal;font-display:swap}
:root{--font-body:'Golos Text',sans-serif;--font-heading:Manrope,'Golos Text',sans-serif}
body,.login-page{font-family:var(--font-body);font-size:15px;font-weight:400;color:#243859;-webkit-font-smoothing:antialiased}
button,input,textarea,select{font-family:var(--font-body)}
h1,h2,h3,h4,.app-brand,.login-story h1,.login-card h2{font-family:var(--font-heading);font-weight:700}
h1{letter-spacing:-1.8px}h2{letter-spacing:-.6px}h3,h4{letter-spacing:-.2px}
.app-brand{font-size:17px;letter-spacing:-.5px}.top-tabs button{font-size:12px;font-weight:500}.account-bar button{font-size:11px}
.section-lead>p,.platform-lead>div>p,.answer-body,.deep-answer{line-height:1.85}.exam-question>summary{font-size:15px;font-weight:500}.concept-flow summary{font-weight:600}.core-idea{line-height:1.85}.eyebrow{letter-spacing:1.7px;font-size:10px;font-weight:500}
.studio-invariant p,.studio-toolbar label,.studio-range-label,.studio-code-footer span{font-size:12px}.studio-code-line code{font-size:12px}.studio-card-heading .eyebrow,.studio-step,.studio-legend{font-size:10px}.studio-player button{font-size:12px}
.login-story h1{font-weight:750;letter-spacing:-3px}.login-card h2{font-size:27px}.login-card p,.login-card label{font-size:14px}.login-card input{font-size:16px}.login-caption{letter-spacing:0}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
#chat{max-width:1320px;margin:auto}.chat-page-heading{display:flex;justify-content:space-between;align-items:center;margin:0 0 28px;gap:20px}.chat-page-heading .eyebrow{color:#7386a5;margin:0 0 8px}.chat-page-heading h1{font-size:38px;margin:0;line-height:1.3}.chat-page-heading h1 span{color:#3974ee}.chat-provider{display:flex;align-items:center;gap:8px;font-size:12px;border:1px solid #dde7f8;background:white;padding:9px 14px;border-radius:100px;color:#56709a}.chat-provider svg{width:15px;height:15px;color:#4c7bea}
.chat-shell{display:grid;grid-template-columns:260px minmax(0,1fr);border:1px solid #dde6f4;border-radius:22px;background:#fff;box-shadow:0 12px 50px #2e569808;overflow:hidden;min-height:650px;height:min(780px,calc(100dvh - 240px))}
.chat-context-panel{padding:25px 23px;border:0;border-right:1px solid #e6edf8;border-radius:0;background:#f8faff;margin:0;overflow:auto}.chat-context-panel>summary{font-size:12px;font-weight:600;display:flex;justify-content:space-between;align-items:center;list-style:none;padding:0 0 24px;color:#436089;cursor:pointer}.chat-context-panel>summary::-webkit-details-marker{display:none}.chat-context-panel>summary>span{font-family:var(--font-heading);color:#3777ef;background:#e8f0ff;border-radius:8px;min-width:32px;height:30px;display:grid;place-items:center}.chat-context-panel label{font-size:11px;color:#7a8ca7}.chat-context-panel select{width:100%;min-width:0;font-size:12px;color:#405b83;background:white;border:1px solid #dce5f5;border-radius:9px;margin:8px 0 0;padding:11px 8px;text-overflow:ellipsis}.chat-context-caption{font-size:9px;letter-spacing:1.3px;color:#7890b1;margin:29px 0 11px}.chat-context-inner h2{font-size:16px;line-height:1.6;letter-spacing:-.2px;padding:0;margin:0 0 13px;color:#344f77}#chat-context{font-size:12px;color:#778aa7;line-height:1.85;margin:0 0 17px}#chat-reference{width:100%;font-size:12px;border:0;color:#4276c9;background:#ebf2ff;text-align:left;padding:11px 13px;border-radius:8px;display:flex;justify-content:space-between;align-items:center}#chat-source{display:flex;gap:10px;padding:22px 0;margin-top:22px;border-top:1px solid #e2eaf8;font-size:11px}.chat-source-icon{color:#7798cb;font-size:22px}#chat-source strong{font-size:11px;font-weight:500;color:#55749e}#chat-source p{font-size:10px;color:#8596af;line-height:1.7;margin:5px 0 0}.chat-context-foot{color:#8b9bb2;font-size:10px;line-height:1.8}
.chat-conversation{display:flex;flex-direction:column;min-width:0;min-height:0;background:linear-gradient(160deg,#fff,#fcfdff)}.chat-conversation-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 25px;border-bottom:1px solid #eef2f8;flex-shrink:0}.chat-conversation-heading>div{display:flex;gap:10px;align-items:center;font-size:11px;color:#8393ac}.chat-small-spark{display:grid;place-items:center;color:#5c87df;width:25px;height:25px;background:#f0f5ff;border-radius:8px}.chat-small-spark svg{width:12px;height:12px}#chat-clear{padding:6px 8px;min-height:30px;color:#8294af;border:0;background:transparent;font-size:10px}
#chat .chat-log{flex:1;min-height:0;max-height:none;overflow-y:auto;padding:28px 32px;scrollbar-width:thin;scrollbar-color:#dee7f5 transparent;overscroll-behavior:contain;display:block}.chat-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100%;padding:28px 0 20px;text-align:center;margin:0}.chat-empty-symbol{width:59px;height:59px;border:1px solid #e0e9fe;background:linear-gradient(140deg,#fbfcff,#edf3ff);border-radius:19px;color:#4a7cee;display:grid;place-items:center;margin-bottom:25px;box-shadow:0 7px 16px #3974ee08}.chat-empty-symbol svg{width:27px;height:27px}.chat-empty .eyebrow{font-size:9px;color:#95a7c0;margin:0 0 10px}.chat-empty h2{font-size:29px;letter-spacing:-1px;line-height:1.4;margin:0 0 13px;padding:0;color:#2c456b}.chat-empty>p:last-of-type{font-size:13px;color:#8a9ab2;line-height:1.85;margin:0}.chat-starters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px;width:100%;max-width:650px;margin-top:31px}.chat-starters button{padding:17px 15px;border:1px solid #e3eaf7;border-radius:12px;background:#fff;text-align:left;line-height:1.6;min-width:0;transition:border-color .2s,transform .2s,box-shadow .2s}.chat-starters button:hover{border-color:#b5ccf9;transform:translateY(-2px);box-shadow:0 5px 16px #3b71c70b}.chat-starters strong{display:flex;align-items:center;justify-content:space-between;gap:6px;font-size:11px;font-weight:500;color:#4c6690;margin-bottom:7px}.chat-starters strong span{color:#9ab5e2}.chat-starters button>span{font-size:10px;color:#94a2b9;font-weight:400;display:block;line-height:1.7}
#chat .chat-message{display:flex;align-items:flex-start;gap:13px;margin:0 auto 26px;padding:0;background:transparent;border:0;border-radius:0;max-width:770px;font-size:14px;line-height:1.8}.chat-avatar{width:29px;height:29px;display:grid;place-items:center;border-radius:10px;background:#edf3ff;color:#4477e5;flex-shrink:0}.chat-avatar svg{width:14px;height:14px}.chat-message-content{min-width:0;flex:1}#chat .speaker{display:block;font-size:10px;font-weight:500;letter-spacing:.2px;color:#8395ae;margin:0 0 7px}.chat-prose{color:#3b506f;font-size:14px;line-height:1.85;overflow-wrap:anywhere}.chat-prose>:first-child{margin-top:0}.chat-prose>:last-child{margin-bottom:0}.chat-prose p{margin:0 0 13px}.chat-prose h3{font-size:17px;color:#314e77;margin:23px 0 10px}.chat-prose ul,.chat-prose ol{padding-left:23px;margin:12px 0 17px}.chat-prose li{margin:6px 0}.chat-prose strong{font-weight:600;color:#365580}.chat-prose blockquote{border-left:3px solid #a6c5ff;background:#f4f8ff;padding:10px 15px;margin:16px 0;color:#6380a8}.chat-prose code{font-family:Consolas,'Courier New',monospace;font-size:.9em;background:#eff4fc;border-radius:4px;padding:2px 5px;color:#3a6bb6}.chat-code{border:1px solid #e1e9f6;border-radius:11px;overflow:hidden;margin:17px 0;background:#f8faff}.chat-code-bar{display:flex;justify-content:space-between;align-items:center;padding:8px 13px;border-bottom:1px solid #e5edf9;font-size:10px;color:#7790b4}.chat-code-bar button{font-size:10px;border:0;background:transparent;color:#587fae;padding:5px 7px;min-height:26px}.chat-code pre{margin:0!important;padding:17px!important;border:0!important;border-radius:0!important;background:transparent!important;white-space:pre;overflow:auto;max-height:400px}.chat-code pre code{background:transparent;padding:0;font-size:12px;line-height:1.8;color:#3e5b87}.chat-table{overflow:auto;margin:16px 0;border:1px solid #e1e9f6;border-radius:10px}.chat-table table{width:100%;border-collapse:collapse;font-size:12px}.chat-table th,.chat-table td{padding:10px 13px;border-bottom:1px solid #e9eff8;text-align:left}.chat-table th{background:#f3f7ff;font-weight:500}
#chat .chat-message.user{justify-content:flex-end;padding-left:45px}#chat .user .chat-message-content{flex:0 1 auto;max-width:90%;padding:13px 18px;background:#edf3ff;border:1px solid #e3ecfc;border-radius:15px 15px 4px 15px}#chat .user .speaker{color:#7e98c0;font-size:9px;margin-bottom:4px}#chat .user .chat-prose{color:#3d5b89}#chat .user.chat-failed .chat-message-content{border-color:#eacda4;background:#fff9f0}.chat-thinking{display:flex;align-items:center;gap:6px;font-size:11px;color:#8c9db6;margin:12px 0 25px}.chat-thinking>.chat-avatar{margin-right:7px}.chat-thinking i{width:4px;height:4px;border-radius:50%;background:#86a6de;animation:chat-pulse 1.3s infinite}.chat-thinking i:nth-last-child(2){animation-delay:.15s}.chat-thinking i:last-child{animation-delay:.3s}.chat-loading{text-align:center;padding:90px 20px;color:#8799b5;font-size:13px}
.chat-compose-area{padding:0 27px 19px;flex-shrink:0;background:#fdfefe}#chat .chat-compose{padding:0;border:1px solid #dae5f6;border-radius:16px;background:white;box-shadow:0 5px 20px #31538c06;margin:0}#chat .chat-compose:focus-within{border-color:#9bbcf5;box-shadow:0 0 0 3px #3b82f610}#chat-input{display:block;width:100%;min-height:66px;height:66px;max-height:180px;resize:none;border:0!important;background:transparent!important;padding:17px 19px 8px!important;margin:0!important;box-shadow:none!important;border-radius:16px;font-size:14px;line-height:1.7;color:#3e5578;outline:none}#chat-input::placeholder{color:#a0aec3}.chat-compose-bottom{display:flex;gap:12px;align-items:center;padding:7px 10px 10px 15px}.chat-mode-label{margin:0}#chat-mode{width:auto!important;margin:0!important;border:0!important;background:#f3f7fd;border-radius:7px;padding:7px 9px!important;font-size:10px!important;color:#7590b6;max-width:200px}#chat-length{font-size:9px;color:#a6b3c7;margin-left:auto}#chat-send{display:grid;place-items:center;width:37px;height:37px;min-height:37px;padding:0;border:0;border-radius:11px;background:#3775ed;box-shadow:0 3px 9px #3775ed21;flex-shrink:0;color:#fff}#chat-send svg{width:21px;height:21px}#chat-send:disabled{background:#c9d8f1;box-shadow:none;opacity:1}.chat-compose-hint{display:flex;justify-content:space-between;flex-wrap:wrap;gap:5px 15px;margin:10px 3px 0}.chat-compose-hint small{font-size:9px;color:#9daac0}#chat-status{font-size:11px;line-height:1.7;margin:8px 3px 0;color:#7b91ae;min-height:0}#chat-status:empty{display:none}#chat-status.is-error{color:#a26638}#chat-reload{font-size:11px;margin-top:8px;padding:7px 10px;min-height:30px}.book-reference{padding:19px 21px;background:#f8faff;border:1px solid #e0e9f7;border-radius:12px;margin:25px 0;font-size:13px;line-height:1.85}.book-reference summary{font-weight:500;color:#5475a3}.book-reference p{margin:12px 0 0;color:#7388a6}.book-reference .source-pages{font-size:11px;color:#8799b2}
@keyframes chat-pulse{0%,70%,100%{opacity:.3;transform:translateY(0)}35%{opacity:1;transform:translateY(-3px)}}
@media(min-width:1100px){.chat-context-panel:not([open]){align-self:start}.chat-context-panel>summary{pointer-events:none}.chat-shell:has(.chat-context-panel:not([open])){grid-template-columns:260px minmax(0,1fr)}}
@media(max-width:1100px){.chat-shell{grid-template-columns:225px minmax(0,1fr);min-height:680px}.chat-context-panel{padding:23px 17px}#chat .chat-log{padding:24px 22px}.chat-starters{gap:8px}.chat-starters button{padding:13px 11px}.chat-starters strong{font-size:10px}.chat-compose-area{padding:0 20px 17px}.chat-empty h2{font-size:27px}}
@media(max-width:760px){.chat-page-heading{margin-bottom:20px}.chat-page-heading h1{font-size:30px;letter-spacing:-1px}.chat-page-heading .eyebrow{font-size:8px;letter-spacing:1px}.chat-provider{font-size:10px;padding:8px 10px}.chat-shell{display:flex;flex-direction:column;height:auto;min-height:0;border-radius:16px}.chat-context-panel{border-right:0;border-bottom:1px solid #e6edf8;padding:13px 18px;overflow:visible;flex-shrink:0}.chat-context-panel>summary{padding:0;font-size:12px;cursor:pointer}.chat-context-panel>summary:after{content:'⌄';margin-left:10px;color:#7496ca}.chat-context-panel>summary>span{margin-left:auto;height:27px;min-width:30px;font-size:11px}.chat-context-panel[open] .chat-context-inner{padding-top:17px}.chat-context-inner h2{font-size:15px}.chat-context-caption{margin-top:17px}#chat-context{font-size:13px}#chat-source{margin-top:15px;padding:15px 0}.chat-context-foot{margin-bottom:0}.chat-conversation{height:690px;min-height:590px;max-height:none}.chat-conversation-heading{padding:13px 17px}.chat-conversation-heading>div{font-size:10px}#chat-clear{font-size:9px}#chat .chat-log{padding:20px 17px}.chat-empty{padding:14px 0}.chat-empty-symbol{width:46px;height:46px;border-radius:14px;margin-bottom:18px}.chat-empty-symbol svg{width:22px;height:22px}.chat-empty h2{font-size:26px}.chat-empty>p:last-of-type{font-size:12px}.chat-starters{grid-template-columns:1fr;gap:8px;margin-top:23px;max-width:360px}.chat-starters button{padding:12px 15px;display:flex;align-items:center;justify-content:space-between;gap:15px}.chat-starters strong{margin:0;font-size:11px;white-space:nowrap}.chat-starters strong span{display:none}.chat-starters button>span{font-size:9px;max-width:150px;line-height:1.5}.chat-compose-area{padding:0 13px 15px}.chat-compose-hint small:last-child{display:none}#chat-input{font-size:14px!important;padding:15px 14px 7px!important}.chat-compose-bottom{padding-left:9px;gap:7px}#chat-length{font-size:8px}#chat-mode{font-size:9px!important;max-width:166px}.chat-prose{font-size:13px}.chat-message-content{min-width:0}#chat .chat-message{gap:9px}.chat-avatar{width:25px;height:25px;border-radius:8px}#chat .chat-message.user{padding-left:20px}#chat .user .chat-message-content{max-width:96%;padding:12px 14px}.chat-code pre code{font-size:11px}.exam-question>summary{font-size:13px}.app-brand{font-size:15px}.top-tabs button{font-size:11px}.studio-invariant p{font-size:13px}.studio-player button{font-size:11px}.studio-toolbar label,.studio-range-label{font-size:11px}}
@media(prefers-reduced-motion:reduce){.chat-thinking i{animation:none}.chat-starters button{transition:none}}
@media print{.book-reference{break-inside:avoid;border-color:#ddd}}
.chat-shell{min-height:560px}
@media(max-width:760px){.chat-shell{min-height:0}.chat-conversation{height:calc(100dvh - 320px);min-height:450px}.chat-empty{padding:8px 0}.chat-empty-symbol{margin-bottom:13px}.chat-empty h2{font-size:24px}.chat-starters{margin-top:17px}}

.chat-memory{margin-top:26px;padding-top:22px;border-top:1px solid #dfe8f6;min-width:0}.chat-memory-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}.chat-memory-heading h3{font-size:15px;margin:0}.chat-memory-heading>span{font-size:10px;border-radius:20px;padding:4px 9px;background:#e7efff;color:#255fcc}.chat-memory-intro,.chat-memory-cost{font-size:11px;line-height:1.65;color:#667a98}.chat-memory label{display:block;font-size:11px;margin:17px 0 7px}.chat-memory select,.chat-memory textarea{width:100%;min-width:0;font:inherit;font-size:11px;color:#243d64;border:1px solid #d5e1f5;background:white;border-radius:10px;padding:10px;box-sizing:border-box}.chat-memory textarea{resize:vertical;line-height:1.6}.chat-memory-small{font-size:10px!important;color:#627796!important;line-height:1.6;margin:7px 0 11px}.memory-add-row{display:flex;gap:7px;min-width:0}.memory-add-row select{flex:1;width:0}.memory-add-row button{flex:0 0 36px;padding:0;font-size:20px}.memory-chips{display:flex;flex-direction:column;gap:6px;margin-top:10px}.memory-chips button{font-size:10px;text-align:left;display:flex;justify-content:space-between;gap:8px;line-height:1.5;padding:8px 10px;background:#edf3ff;color:#285898;overflow-wrap:anywhere}.memory-chips button span{font-size:15px}.memory-lab{background:#eaf2ff;border:1px solid #d1e3fc;border-radius:12px;padding:12px;font-size:11px;line-height:1.6;margin:14px 0}.memory-lab strong{display:block}.memory-lab small{display:block;color:#587398}.memory-lab button{font-size:10px;margin-top:9px;padding:6px 9px}#memory-save{width:100%;margin-top:10px;font-size:11px;background:#fff;border:1px solid #ccdafa;color:#245ecb}.chat-memory-cost{font-size:10px;margin-bottom:0}.chat-memory button:disabled,.chat-memory select:disabled,.chat-memory textarea:disabled{opacity:.55}.chat-context-panel{scrollbar-width:thin}@media(max-width:760px){.chat-memory{margin-top:20px}.chat-memory select,.chat-memory textarea{font-size:14px}.chat-memory label{font-size:12px}}