:root{--ink:#273c36;--muted:#78867f;--green:#326456;--pale:#e8f0e8;--line:#e4e8df;--paper:#fcfcf7;--accent:#d2a75b;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{opacity:.5;cursor:wait}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #93b5a7;outline-offset:3px}[hidden]{display:none!important}.muted,small{color:var(--muted)}small{font-size:12px;line-height:1.7}.login-screen{min-height:100dvh;display:grid;grid-template-columns:1fr 1fr;max-width:1200px;margin:auto;align-items:center;padding:70px;gap:100px}.eyebrow{font-size:13px;letter-spacing:3px;color:var(--green)}h1{font-size:64px;line-height:1.35;letter-spacing:2px;font-weight:600;margin:25px 0}.login-art p{font-size:18px;line-height:1.9;color:#738277}.math-doodle{display:flex;gap:15px;margin-top:50px}.math-doodle span{height:65px;width:65px;display:grid;place-items:center;border:1px solid #c9d5c6;border-radius:18px;font-size:32px;transform:rotate(-8deg);color:var(--green)}.math-doodle span:nth-child(2){background:#f4e9ca;transform:rotate(8deg);border:0}.math-doodle span:nth-child(3){background:var(--pale);transform:rotate(-3deg);border:0}.login-card{background:#fff;border:1px solid var(--line);padding:38px;border-radius:24px;box-shadow:0 20px 60px #344c3b08}.brandmark{background:var(--green);color:#fff;border-radius:13px;width:44px;height:44px;display:grid;place-items:center;font-family:Georgia,serif;font-size:30px}.login-card h2{font-size:25px;margin-bottom:10px}.login-card p{font-size:13px;line-height:1.8}.login-card label{display:block;font-size:13px;margin-top:22px}input{width:100%;padding:13px 14px;background:#fafbf8;border:1px solid var(--line);border-radius:9px;margin-top:8px;color:var(--ink);font-size:16px}.primary{background:var(--green);color:white;border-radius:10px;padding:12px 24px;font-weight:600}.login-card .primary{width:100%;display:flex;justify-content:space-between;margin:10px 0 20px}.error{color:#a74f3c;font-size:13px}.workspace{height:100dvh;display:grid;grid-template-columns:268px 1fr;overflow:hidden}aside{background:#f0f3ea;border-right:1px solid var(--line);padding:28px 20px 18px;display:flex;flex-direction:column;min-height:0}.brand{display:flex;align-items:center;gap:12px}.brand strong{font-size:16px}.brand small{display:block;font-size:10px;margin-top:4px}.brand .brandmark{width:36px;height:36px;font-size:25px;border-radius:10px;flex-shrink:0}.new-chat{border:1px solid #c8d7c8;color:var(--green);background:#fafcf6;border-radius:10px;padding:13px;margin:32px 0 28px;font-size:13px;text-align:left}.side-label{font-size:11px;letter-spacing:1px;color:#869180;padding:0 10px;margin-bottom:12px}nav{flex:1;overflow-y:auto}nav button{display:block;text-align:left;width:100%;border-radius:10px;padding:13px 12px;margin-bottom:5px;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}nav button.active{background:#dfe9dc}nav small{display:block;font-size:10px;margin-top:5px}.sidebar-bottom{border-top:1px solid #dae3d6;padding-top:12px;display:grid;gap:4px}.sidebar-bottom button{text-align:left;font-size:12px;padding:10px;border-radius:8px}.sidebar-bottom button:hover,nav button:hover{background:#e4ebde}main{min-width:0;display:flex;flex-direction:column;height:100dvh}header{height:82px;padding:20px 40px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px;flex-shrink:0;background:#fff9}header strong{font-size:16px}header small{display:block;margin-top:5px;font-size:11px}.status-dot{font-size:11px;color:var(--green);white-space:nowrap}.status-dot:before{content:'●';font-size:9px;margin-right:7px;color:#82a77e}.messages{overflow-y:auto;flex:1;padding:32px max(24px,calc((100% - 780px)/2));scroll-behavior:smooth}.welcome{max-width:620px;margin:6vh auto 30px;text-align:center}.welcome .symbol{font-family:Georgia,serif;font-size:46px;color:var(--green);display:inline-grid;place-items:center;width:86px;height:86px;background:#ecf1e6;border-radius:27px;transform:rotate(-5deg)}.welcome h2{font-size:28px;font-weight:500;margin:26px 0 12px}.welcome p{font-size:14px;color:var(--muted);line-height:1.9}.starter-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;text-align:left;margin-top:30px}.starter{background:white;border:1px solid var(--line);border-radius:13px;padding:20px;text-align:left;font-size:13px;line-height:1.8}.starter span{display:block;color:var(--muted);font-size:11px;margin-top:5px}.message{margin:0 0 27px;max-width:100%;font-size:16px;line-height:1.85}.message-label{font-size:11px;color:var(--muted);margin:0 0 8px;display:flex;gap:10px}.message.user{margin-left:12%;}.message.user .bubble{background:#eaf0e4;border-radius:17px 17px 4px 17px;padding:14px 19px;white-space:pre-wrap;overflow-wrap:anywhere}.message.assistant .bubble{padding:3px 0;overflow-wrap:anywhere}.bubble p{margin:0 0 13px}.bubble p:last-child{margin-bottom:0}.bubble pre{overflow:auto;background:#edf0e7;border-radius:9px;padding:14px;font-size:13px}.bubble table{border-collapse:collapse;display:block;overflow:auto}.bubble td,.bubble th{border:1px solid var(--line);padding:5px 12px}.bubble img{max-width:100%;border-radius:10px}.message-images{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}.message-images img{max-height:240px;max-width:100%;border-radius:10px;cursor:zoom-in}.katex-display{overflow-x:auto;overflow-y:hidden;padding:5px 0}.pending{color:var(--muted);font-size:14px}.pending:after{content:' ···';animation:pulse 1.5s infinite}@keyframes pulse{50%{opacity:.3}}.composer-wrap{padding:12px max(24px,calc((100% - 780px)/2)) max(18px,env(safe-area-inset-bottom));background:linear-gradient(#fcfcf700,var(--paper) 15%);flex-shrink:0}#composer{background:#fff;border:1px solid #ccd8c9;border-radius:17px;box-shadow:0 5px 20px #283c2d05;padding:15px 17px 12px}textarea{border:0;resize:none;width:100%;max-height:180px;min-height:55px;background:transparent;line-height:1.7;font-size:16px;color:var(--ink);outline:none}textarea::placeholder{color:#a0aaa1}.composer-actions{display:flex;align-items:center;justify-content:space-between;margin-top:8px;gap:10px}.upload-actions{display:flex;gap:5px}.upload-actions button{padding:8px;font-size:16px;color:#687d6a}.upload-actions span{font-size:12px}.composer-actions .primary{font-size:13px;padding:10px 18px}.composer-foot{margin-top:10px;text-align:center;font-size:10px;line-height:1.8;color:var(--muted)}.composer-foot small{display:block;font-size:10px}.image-preview{display:flex;gap:8px;padding-bottom:8px}.attachment{position:relative}.attachment img{height:70px;width:70px;object-fit:cover;border-radius:9px;border:1px solid var(--line)}.attachment button{position:absolute;right:-4px;top:-5px;border-radius:50%;width:22px;height:22px;background:var(--green);color:white}.notice{font-size:12px;border-radius:10px;padding:10px 14px;background:#f4eacb}.notice button{color:var(--green);text-decoration:underline;margin-left:8px}#toast{font-size:12px;color:#a74f3c;text-align:center;margin-top:7px;min-height:16px}.icon-btn{font-size:24px;padding:4px 10px}.mobile{display:none}dialog{border:1px solid var(--line);border-radius:20px;max-width:650px;width:90%;padding:32px;color:var(--ink);max-height:85dvh}dialog::backdrop{background:#19392b55;backdrop-filter:blur(3px)}.modal-close{position:absolute;right:10px;top:8px}dialog h2{margin-top:0}dialog p{line-height:1.8;font-size:14px}dialog label{font-size:13px;display:block;margin-bottom:14px}dialog .primary{margin-top:12px}.memory-card{padding:14px;border:1px solid var(--line);border-radius:10px;margin:10px 0;font-size:14px;line-height:1.7}.memory-card small{display:block}.photo-full{width:100%;height:auto}.parent-note{background:#f3f6ed;padding:12px;border-radius:8px}.admin-grid{display:grid;gap:10px}.admin-grid textarea{border:1px solid var(--line);padding:12px;min-height:150px}
@media(max-width:1000px){.login-screen{padding:40px;gap:45px}h1{font-size:48px}.workspace{grid-template-columns:235px 1fr}aside{padding:23px 15px}header{padding:18px 25px}.messages{padding:24px}.composer-wrap{padding-left:24px;padding-right:24px}}
@media(max-width:700px){.login-screen{display:block;padding:30px 22px}.login-art{display:none}.login-card{max-width:420px;margin:5vh auto;padding:28px}.workspace{display:block}aside{position:fixed;left:0;top:0;bottom:0;width:275px;z-index:5;box-shadow:10px 0 50px #24362822;transform:translateX(-110%);transition:transform .2s}aside.open{transform:translateX(0)}.mobile{display:block}#close-menu{margin-left:auto}header{height:73px;padding:12px 15px;justify-content:flex-start}header strong{font-size:14px}.status-dot{margin-left:auto}.messages{padding:24px 20px}.composer-wrap{padding:8px 13px max(12px,env(safe-area-inset-bottom))}.welcome{margin-top:4vh}.welcome h2{font-size:24px}.starter{padding:14px}.message{font-size:16px}.message.user{margin-left:6%}.composer-foot{font-size:9px}.composer-foot small{font-size:9px}dialog{padding:26px 20px}.upload-actions span{font-size:11px}}

/* Keep the chat inside the visible area above the iPad keyboard. */
body.chat-open{height:100%;overflow:hidden;overscroll-behavior:none}
body.chat-open .workspace{position:fixed;left:0;right:0;top:var(--chat-top,0px);height:var(--chat-height,100dvh)}
.workspace main{height:100%;min-height:0;overflow:hidden}
.workspace .messages{min-height:0;overscroll-behavior-y:contain;-webkit-overflow-scrolling:touch;scroll-behavior:auto}
.workspace nav{min-height:0;overscroll-behavior-y:contain}
.workspace header>div{min-width:0}
#chat-title{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.keyboard-open .workspace header{height:54px;padding-top:8px;padding-bottom:8px}
.keyboard-open .workspace header small,.keyboard-open .composer-foot{display:none}
.keyboard-open .composer-wrap{padding-top:6px;padding-bottom:6px}
.keyboard-open #composer{padding:8px 12px}
.keyboard-open #question{height:48px;min-height:48px;max-height:90px}
.keyboard-open .composer-actions{margin-top:2px}
.keyboard-open .attachment img{width:44px;height:44px}
.keyboard-open #toast:empty{display:none}
.keyboard-open dialog{max-height:calc(var(--chat-height,100dvh) - 24px);overflow:auto}
@media(max-width:700px){body.chat-open aside{top:var(--chat-top,0px);bottom:auto;height:var(--chat-height,100dvh)}}