:root{--bg:#f5f5f0;--paper:#fff;--ink:#25312e;--muted:#76817a;--line:#e2e6de;--green:#244b42;--soft:#e8eee6;--accent:#ad8550;--danger:#9f4541;--radius:16px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--ink);border-radius:10px;padding:9px 15px;transition:background .15s}button:hover{background:var(--soft)}button:disabled{opacity:.5;cursor:wait}a{color:var(--green)}h1,h2,h3,p{margin:0}h1{font-size:32px;line-height:1.4;letter-spacing:-.8px}h2{font-size:21px}h3{font-size:17px}.muted{color:var(--muted)}.small,small{font-size:12px}.eyebrow{font-size:12px;letter-spacing:1px;color:var(--accent);margin-bottom:7px}.primary{background:var(--green);color:white;border-color:var(--green)}.primary:hover{background:#346052}.plain{background:transparent;border-color:transparent;color:var(--muted)}input,textarea,select{border:1px solid var(--line);border-radius:9px;padding:10px 12px;background:#fff;color:var(--ink);max-width:100%}input:focus,textarea:focus,select:focus{outline:2px solid #8ca99b;outline-offset:1px}label{display:block}.brand-mark{display:grid;place-items:center;background:var(--green);color:#f5f1df;border-radius:12px;width:42px;height:42px;font-family:serif;font-size:25px;flex-shrink:0}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-weight:650;font-size:18px}.brand small{display:block;font-weight:400;font-size:11px;color:var(--muted);margin-top:2px}.sidebar{position:fixed;inset:0 auto 0 0;width:248px;padding:34px 22px;background:#eef0e9;border-right:1px solid var(--line);display:flex;flex-direction:column}.sidebar nav{display:grid;gap:9px;margin-top:48px}.sidebar nav button{text-align:left;display:flex;gap:12px;align-items:center;background:transparent;border:none;font-size:18px;padding:12px 15px;color:#66746b}.sidebar nav button span{font-size:14px}.sidebar nav button.active{background:var(--green);color:white}.sidebar-bottom{margin-top:auto;font-size:12px;color:var(--muted);display:flex;align-items:center;gap:7px}.sidebar-bottom button{margin-left:auto;font-size:12px;padding:4px 8px}.private-dot{width:7px;height:7px;border-radius:50%;background:#7a9877}main{margin-left:248px;max-width:1450px;padding:0 48px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:25px 0;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.quiet-badge{background:var(--soft);padding:3px 10px;border-radius:20px}.page-head{display:flex;gap:20px;justify-content:space-between;align-items:center;padding:32px 0 25px}.page-head .muted{margin-top:8px;font-size:13px}.filter-panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:22px}.search-row{display:flex;gap:9px}.search-row input{flex:1;min-width:0;background:#fafbf8}.filter-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:12px}.filter-row label{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted)}.filter-row input{font-size:12px;padding:6px}.filter-row select{padding:6px 9px;font-size:12px}.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}.chips:empty{display:none}.chip{padding:3px 10px;font-size:12px;border-radius:20px;border-color:transparent;background:#f0f2eb;color:#68766b}.chip.selected{background:var(--green);color:white}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:14px}.card{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);padding:20px;min-width:0}.conversation-card{display:flex;flex-direction:column;gap:12px}.card-head{display:flex;align-items:start;justify-content:space-between;gap:12px}.avatar{width:38px;height:38px;display:grid;place-items:center;background:var(--soft);border-radius:11px;color:var(--green);font-weight:600;flex-shrink:0}.conversation-card h3{flex:1;word-break:break-word}.meta{font-size:12px;color:var(--muted)}.card-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #f0f1ed;padding-top:12px;margin-top:auto}.card-bottom button{padding:5px 10px;font-size:12px}.card-tags{display:flex;flex-wrap:wrap;gap:5px;min-height:20px}.pill{font-size:11px;border-radius:6px;padding:1px 7px;background:#f0f2eb;color:#5d725f}.pill.amber{color:#906e37;background:#f8f1e2}.empty{text-align:center;padding:65px 22px;border:1px dashed #cbd5c8;border-radius:var(--radius);color:var(--muted)}.empty h2{color:var(--ink);margin:10px 0}.empty p{max-width:510px;margin:0 auto}.notice{background:#f5efdf;color:#796137;border:1px solid #e8ddbf;padding:12px 16px;border-radius:11px;margin-bottom:17px;font-size:13px}.toolbar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:15px}.toolbar .spacer{flex:1}.messages{display:grid;gap:12px}.message{border:1px solid var(--line);background:white;border-radius:13px;padding:16px 19px;scroll-margin-top:20px}.message.mine{background:#edf3ea}.message.anchor{outline:2px solid #ad8550}.message-header{display:flex;gap:10px;align-items:baseline;font-size:12px;color:var(--muted);margin-bottom:9px}.message-header strong{font-size:13px;color:var(--ink)}.message-text{white-space:pre-wrap;word-break:break-word;font-size:15px}.message-actions{display:flex;gap:6px;margin-top:10px;justify-content:flex-end}.message-actions button{font-size:11px;padding:3px 8px;background:transparent}.message-actions button.saved{color:var(--accent)}mark{background:#f7e7ad;color:inherit;border-radius:3px}.source-hint{font-size:11px;color:#958a74;margin-top:10px}.article-tools{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.article-card{display:grid;gap:10px}.article-card h3{font-size:18px}.article-card .card-bottom{gap:8px}.article-card progress{width:100%;height:4px;accent-color:var(--green)}.article-reader{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:30px;max-height:72vh;overflow-y:auto;scroll-behavior:auto}.article-body{max-width:710px;margin:25px auto 0;font-size:17px;line-height:1.95;word-break:break-word}.article-body p{margin:15px 0}.article-body img{max-width:100%;height:auto;display:block;margin:18px auto}.article-body a{overflow-wrap:anywhere}.article-body blockquote{border-left:3px solid #9cb09b;padding-left:16px;color:#647367}.article-body pre{white-space:pre-wrap;background:#f5f6f1;padding:12px;overflow:auto}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:24px}.stat{padding:22px;background:white;border:1px solid var(--line);border-radius:var(--radius)}.stat b{font-size:30px;display:block;font-weight:500}.settings-box{margin:16px 0}.settings-box p{margin:9px 0}.send-form{display:grid;gap:16px;max-width:800px}.send-form textarea{width:100%;min-height:180px}.result-text{white-space:pre-wrap;word-break:break-word}.citation-button{margin:3px;font-size:12px;padding:4px 8px}.check{display:flex;align-items:center;gap:10px;margin:15px 0}input[type=checkbox]{accent-color:var(--green);width:17px;height:17px}.login-wrap{min-height:100dvh;display:grid;place-items:center;padding:20px;background:radial-gradient(ellipse at top left,#e2ebdf,transparent 65%),var(--bg)}.login-wrap[hidden]{display:none}.login-card{background:white;padding:38px;border-radius:24px;width:100%;max-width:430px;border:1px solid var(--line);box-shadow:0 20px 80px #25402e0a}.login-card .brand-mark{margin-bottom:25px}.login-card h1{font-size:27px}.login-card label{margin-top:20px;font-size:12px}.login-card input{display:block;width:100%;margin-top:6px}.login-card button.primary{width:100%;margin-top:25px;display:flex;justify-content:space-between}.login-card small{display:block;text-align:center;color:var(--muted);margin-top:24px}.error{color:var(--danger);font-size:13px;margin-top:12px}dialog{border:1px solid var(--line);border-radius:20px;padding:25px;width:min(600px,calc(100% - 28px));max-height:85dvh;overflow:auto;color:var(--ink)}dialog::backdrop{background:#18332970;backdrop-filter:blur(2px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:17px}dialog label input:not([type=checkbox]){width:100%;margin:7px 0 10px}#result-dialog{width:min(850px,calc(100% - 28px))}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#203f36;color:#fff;border-radius:12px;padding:11px 22px;z-index:99;max-width:90%;box-shadow:0 8px 30px #0002;font-size:13px}footer{padding:36px 0 24px;text-align:center;color:#9aa196;font-size:11px}[hidden]{display:none!important}
.toolkit-frame{width:100%;height:75vh;border:1px solid var(--line);border-radius:12px;background:white;margin-top:16px}.chat-log{display:flex;flex-direction:column;gap:14px;margin-bottom:22px;max-width:850px}.chat-bubble{align-self:flex-start;max-width:90%;padding:14px 18px;background:white;border:1px solid var(--line);border-radius:15px;white-space:pre-wrap;overflow-wrap:anywhere}.chat-bubble p{margin:6px 0}.chat-bubble.mine{align-self:flex-end;background:var(--soft)}.chat-bubble small{color:var(--muted);font-size:11px}.chat-compose{display:grid;gap:12px;max-width:850px}.chat-compose textarea{width:100%;min-height:110px;resize:vertical}.topbar{gap:10px;flex-wrap:wrap}
@media(max-width:950px){.sidebar{width:205px;padding:25px 14px}.brand{font-size:16px}.brand small{font-size:9px}main{margin-left:205px;padding:0 24px}.grid{grid-template-columns:repeat(auto-fill,minmax(225px,1fr))}}
@media(max-width:650px){body{font-size:14px}.sidebar{position:static;width:100%;padding:14px 16px 0;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:17px}.brand .brand-mark{width:33px;height:33px;font-size:21px;border-radius:9px}.brand small{display:none}.sidebar nav{display:flex;overflow-x:auto;margin-top:14px;gap:4px;padding-bottom:10px;scrollbar-width:none}.sidebar nav button{padding:8px 11px;white-space:nowrap;border-radius:9px;gap:5px;font-size:13px}.sidebar nav button span{font-size:12px}.sidebar-bottom{position:absolute;right:15px;top:19px}.sidebar-bottom .private-dot{display:none}.sidebar-bottom{font-size:0}.sidebar-bottom button{font-size:11px}main{margin-left:0;padding:0 16px}.topbar{padding:12px 0}.page-head{padding:22px 0 18px;align-items:start;gap:10px}h1{font-size:26px}.page-head .muted{font-size:12px}.eyebrow{font-size:10px}.page-head button{padding:7px 10px;font-size:12px}.filter-panel{padding:12px}.filter-row{gap:8px}.filter-row label{gap:4px}.filter-row input{max-width:134px;padding:5px}.search-row button{padding:8px 10px;font-size:12px}.search-row input{font-size:13px;padding:10px}.grid{grid-template-columns:1fr}.card{padding:17px}.conversation-card{gap:10px}.message{padding:13px 14px}.message-text{font-size:14px}.message-header{gap:7px;font-size:10px;flex-wrap:wrap}.message-header strong{font-size:12px}.article-reader{padding:20px 16px;max-height:73vh}.article-body{font-size:16px}.stats{gap:8px}.stat{padding:13px}.stat b{font-size:24px}.stat .muted{font-size:11px}.login-card{padding:27px}.empty{padding:43px 18px}footer{font-size:10px}.toolbar button{font-size:12px;padding:7px 10px}#toast{bottom:18px}}

.account-form{display:grid;gap:14px;max-width:560px;margin-top:18px}.account-form label,.mentor-panel label{font-size:13px}.account-form input,.mentor-panel textarea{display:block;width:100%;margin-top:6px}.account-form button{justify-self:start}.mentor-panel{max-width:850px;margin-bottom:20px;display:grid;gap:13px}.mentor-modes,.mentor-starters{display:flex;gap:8px;flex-wrap:wrap}.mentor-modes button[aria-pressed=true]{font-weight:600}.mentor-panel>button{justify-self:start}.mentor-panel textarea{min-height:78px;resize:vertical}

/* Original C app mark; preserve the familiar interface layout. */
img.brand-mark{object-fit:contain;background:#fbf3e3;border:1px solid #e6d4b8}
.attachment-tray{display:flex;gap:12px;flex-wrap:wrap;padding:12px;border:1px dashed var(--line);border-radius:14px;background:var(--soft)}.attachment-tray[hidden]{display:none}.attachment-card{position:relative;width:100px;min-width:0}.attachment-card img{display:block;width:100px;height:86px;object-fit:cover;border-radius:10px}.attachment-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px;margin-top:5px}.attachment-remove{position:absolute;right:-6px;top:-6px;width:28px;height:28px;padding:0;border-radius:50%;background:white;border:1px solid var(--line);font-size:20px}.compose-actions{display:flex;justify-content:space-between;gap:12px}.compose-actions button{min-height:44px}.chat-images{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0;max-width:100%}.chat-images a{display:block;max-width:100%;min-width:0}.chat-images img{display:block;max-width:100%;width:220px;max-height:260px;object-fit:contain;border-radius:10px}.chat-compose{min-width:0}.chat-compose textarea:disabled{opacity:.7}