:root{--bg:#f5f6f3;--panel:#fff;--ink:#25352d;--muted:#768179;--line:#dfe5dd;--green:#365c45;--light:#eaf0e7;--rust:#b56d45}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI","Microsoft JhengHei",sans-serif;color:var(--ink);background:var(--bg);font-size:14px}button,input,textarea,select{font:inherit}button,.button{padding:9px 13px;border:1px solid var(--line);background:white;border-radius:8px;color:var(--ink);cursor:pointer;text-decoration:none;display:inline-block}button:hover,.button:hover{background:var(--light)}button:disabled{opacity:.5;cursor:wait}.primary{background:var(--green);color:#fff;border-color:var(--green)}.primary:hover{background:#254632}input,textarea,select{padding:10px;border:1px solid #ccd6cb;border-radius:7px;background:#fff;color:var(--ink);width:100%}textarea{resize:vertical;line-height:1.65}input:focus,textarea:focus{outline:2px solid #bfd2b7;outline-offset:1px}label{display:block;margin:12px 0;line-height:1.9}label>input,label>textarea{display:block;margin-top:5px}input[type=checkbox]{width:auto;display:inline-block;margin:0 8px 0 0}.check{font-size:13px}.muted,small{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:2px;color:var(--muted);font-weight:700;text-transform:uppercase}h1{font-size:23px;font-weight:600;margin:8px 0}h2{font-size:23px;font-weight:600}p{line-height:1.8}header{height:80px;display:flex;justify-content:space-between;align-items:center;padding:0 28px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:21px;font-weight:650}.brand small{display:block;font-size:11px;font-weight:400;letter-spacing:1px;margin-top:2px}.brand-mark{width:36px;height:40px;background:var(--green);color:white;display:grid;place-items:center;border-radius:14px 3px 14px 3px}.header-actions{display:flex;align-items:center;gap:8px}.header-actions>span{font-size:12px;margin-right:12px}.workspace{display:grid;grid-template-columns:240px minmax(360px,1fr) 260px;height:calc(100dvh - 80px)}.sidebar{padding:22px 14px;border-right:1px solid var(--line);overflow:auto}.section-title{font-weight:700;font-size:13px;letter-spacing:.8px;display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.icon{padding:2px 8px;font-size:21px;border:0;background:transparent}.list-item{width:100%;text-align:left;border:0;background:transparent;padding:12px;border-radius:8px;margin:2px 0;overflow-wrap:anywhere}.list-item.active{background:#e5eddf;color:#284c35}.list-item span{display:block;font-size:11px;color:var(--muted);margin-top:5px}.conversations-title{margin-top:35px}.subtle-link{display:block;font-size:12px;color:var(--green);margin:20px 8px}main{display:flex;flex-direction:column;min-width:0;background:#fcfcfa}.chat-heading{display:flex;justify-content:space-between;align-items:center;padding:23px 30px 18px;border-bottom:1px solid var(--line);gap:10px}.chat-heading>div:last-child{display:flex;gap:6px;flex-wrap:wrap}.chat-heading h1{font-size:19px;overflow-wrap:anywhere}.chat-heading button,.chat-heading .button{font-size:12px}.messages{flex:1;overflow:auto;padding:28px max(25px,calc((100% - 850px)/2));scroll-behavior:smooth}.welcome{max-width:800px;margin:6vh auto}.pill{border:1px solid #ccd7c6;border-radius:30px;padding:7px 13px;font-size:11px;color:var(--green)}.welcome h2{font-family:Georgia,"Microsoft JhengHei",serif;font-size:40px;line-height:1.4;font-weight:400;margin-top:27px}.welcome>p{color:var(--muted);font-size:14px}.welcome-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:38px}.welcome-grid>div{border-top:1px solid var(--line);padding-top:15px;font-size:12px;color:var(--rust)}.welcome-grid b{display:block;color:var(--ink);font-size:13px;margin:10px 0}.welcome-grid span{display:block;color:var(--muted);font-size:11px}.message{margin-bottom:26px}.message-header{font-size:12px;font-weight:700;margin-bottom:9px;display:flex;gap:12px;align-items:center}.message-header small{font-weight:400;font-size:10px}.message-body{line-height:1.9;overflow-wrap:anywhere}.message.user{margin-left:10%;padding:16px 20px;background:#eaf0e5;border-radius:15px 15px 3px 15px}.message.assistant{padding:0 5px}.message-body>:first-child{margin-top:0}.message-body img{max-width:100%;max-height:420px;object-fit:contain;border-radius:8px;display:block;margin:12px 0}.message-body pre{padding:16px;background:#eff2ed;overflow:auto;border-radius:8px;white-space:pre}.message-body code{font-family:Consolas,monospace}.message-body table{border-collapse:collapse;max-width:100%;display:block;overflow:auto}.message-body td,.message-body th{padding:8px 12px;border:1px solid var(--line)}.message-body blockquote{border-left:3px solid #b1c6a8;margin-left:0;padding-left:16px;color:#62715f}.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}.source-box{border:1px solid var(--line);border-radius:8px;padding:10px 13px;margin-top:12px;font-size:12px}.source-box summary{cursor:pointer;color:var(--green)}.source{padding:12px 0;border-top:1px solid var(--line);margin-top:10px}.source pre{white-space:pre-wrap;background:#f2f5ef;padding:10px;max-height:250px;overflow:auto}.source img{max-width:100%;max-height:180px;margin:6px}.composer-wrap{padding:12px 25px 8px;border-top:1px solid var(--line);background:#fcfcfa}.composer{max-width:900px;margin:auto;border:1px solid #cfd8cb;background:#fff;border-radius:12px;box-shadow:0 4px 25px #25352d05;padding:10px}.composer textarea{border:0;min-height:75px;max-height:280px;outline:none}.composer-actions{display:flex;justify-content:space-between;align-items:center;gap:6px}.composer-actions button{font-size:12px}.composer-actions>div{display:flex;gap:5px;flex-wrap:wrap}.composer-note{text-align:center;font-size:10px;color:var(--muted);margin:8px 0 2px}.pending-images{display:flex;gap:8px;max-width:900px;margin:auto}.pending-images div{position:relative}.pending-images img{height:70px;width:90px;object-fit:cover;border-radius:6px}.pending-images button{position:absolute;right:0;top:0;padding:1px 6px}.materials{background:#f7f8f5;padding:26px 20px;border-left:1px solid var(--line);overflow:auto}.materials .muted{font-size:12px}.full{width:100%}.document{padding:15px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.document a{color:var(--green);font-size:12px}.document small{display:block;font-size:10px;margin:6px 0}.document button{font-size:10px;padding:3px 8px}.tip{font-size:11px;margin-top:35px;color:var(--muted)}.tip b{color:var(--ink);font-size:12px}.notice{font-size:12px;color:#786747;padding:10px 13px;background:#f4f0e6;border-radius:7px;line-height:1.8}.login{min-height:100dvh;display:grid;place-items:center;background:radial-gradient(ellipse at top left,#dce7d3,transparent 60%),var(--bg)}.login-card{width:min(500px,92vw);padding:40px;background:#ffffffdd;border:1px solid white;box-shadow:0 15px 60px #283d2820;border-radius:18px}.login-card h1{font-size:28px;margin-top:20px}.login-card>p{color:var(--muted);font-size:13px}.login-card form{margin-top:25px}.login-card .primary{width:100%;margin:12px 0}dialog{border:1px solid var(--line);border-radius:15px;padding:26px;max-width:min(650px,94vw);max-height:92dvh;color:var(--ink);box-shadow:0 20px 90px #0003}dialog::backdrop{background:#1a2e235a;backdrop-filter:blur(3px)}.large-dialog{width:1000px;max-width:94vw}.dialog-top{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:16px}.dialog-top h2{margin:4px 0}.dialog-bottom{display:flex;justify-content:flex-end}.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0 16px}.form-grid label{font-size:12px}.inline-form{display:flex;gap:8px;flex-wrap:wrap}.inline-form input{flex:1;min-width:180px}.inline-form select{width:120px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;margin-top:15px}td,th{text-align:left;border-bottom:1px solid var(--line);padding:12px}td button{font-size:11px;padding:5px 10px;margin-right:5px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);padding:14px 22px;background:#283f30;color:white;border-radius:10px;box-shadow:0 6px 30px #0002;max-width:90vw;z-index:100;font-size:13px;white-space:pre-wrap}#toast.error{background:#8b4032}.busy-line{padding:20px;color:var(--muted);font-size:13px}[hidden]{display:none!important}@media(max-width:1100px){.workspace{grid-template-columns:205px minmax(340px,1fr);height:auto}.sidebar{grid-row:1 / span 2;max-height:calc(100dvh - 80px);position:sticky;top:0}main{height:calc(100dvh - 80px)}.materials{display:block;grid-column:2;max-height:400px}.chat-heading{padding:18px}.messages{padding:24px}.header-actions button{font-size:11px}.composer-wrap{padding:10px 15px}}@media(max-width:700px){header{height:auto;min-height:72px;padding:12px;gap:12px;flex-wrap:wrap}.header-actions{flex-wrap:wrap;gap:5px}.brand{font-size:18px}.workspace{display:flex;flex-direction:column;height:auto}.sidebar{position:static;border-right:0;max-height:230px;border-bottom:1px solid var(--line)}.sidebar .conversations-title{margin-top:15px}.list-item{width:auto;max-width:220px;vertical-align:top}.materials{display:block;border-left:0;border-top:1px solid var(--line)}main{height:85dvh;min-height:600px}.chat-heading{flex-wrap:wrap}.welcome h2{font-size:29px}.welcome-grid{gap:10px}.form-grid{grid-template-columns:1fr 1fr}.composer-actions{align-items:end}.composer-actions>div{max-width:65%}}

/* Permanent cleanup appears only in authenticated management pages. */
.trash-dialog{width:920px;max-width:94vw;max-height:90dvh;overflow:auto}.trash-toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.trash-rows{display:grid;gap:12px;margin:16px 0}.trash-row{border:1px solid var(--line);border-radius:10px;padding:14px;overflow-wrap:anywhere}.trash-row small{display:block;color:var(--muted);margin:7px 0}.trash-row .check{margin:0}.trash-row .check strong{overflow-wrap:anywhere;min-width:0}.trash-row .notice{font-size:12px}.danger{color:#8d302c;border-color:#d2a4a0;background:#fff6f5}.danger:disabled{opacity:.5}#trashConfirmItems{max-height:220px;overflow:auto;overflow-wrap:anywhere}#trashConfirmCounts{line-height:1.8}#trashConfirmForm label{display:block}#trashConfirmText{margin:8px 0;width:100%}

.reply-timing{font-size:12px;color:var(--muted);margin:12px 0 0;line-height:1.7;overflow-wrap:anywhere}.reply-failures{font-size:12px;color:#786747;border:1px solid var(--line);border-radius:8px;padding:12px;margin-top:16px}.reply-failures section{border-top:1px solid var(--line);padding:8px 0}.message-body .katex-display{overflow-x:auto;overflow-y:hidden;max-width:100%}

.microphone-button{min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center}.microphone-button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.microphone-button.is-recording{color:#b94739;background:#fff0ec}

/* Long formulas scroll locally. Inline padding also contains radical/accent ink
   and fractional-pixel overhang, avoiding scrollbars on short expressions. */
.math-render{min-width:0;max-width:100%}.math-inline{display:inline-block;vertical-align:middle;overflow-x:auto;overflow-y:hidden;padding:.25em .35em}.math-display{display:block;overflow-x:auto;overflow-y:hidden}.message-body .math-display .katex-display{width:max-content;min-width:100%;max-width:none;overflow:visible}.fixed-formulas{min-width:0;max-width:100%}.fixed-formulas .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden}.fixed-formulas .katex-display>.katex{display:inline-block;width:max-content;min-width:100%}

.math-invalid{color:#8b4032;background:#fff4ed;border-radius:4px;padding:.15em .35em;overflow-wrap:anywhere}.math-format-warning{font-family:system-ui,"Microsoft JhengHei",sans-serif;font-size:.9em}.math-invalid .katex-error{white-space:pre-wrap;font-size:.9em}