:root{--bg: #05080f;--panel: #0b111c;--line: #1d2638;--text: #e6ebf5;--muted: #8b97ab;--accent: #3a6df0;--warn: #f0b03a;--bad: #f06a6a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.55 Inter,system-ui,sans-serif}button{font:inherit;color:inherit}.center{min-height:100vh;display:grid;place-items:center;padding:16px}.card{max-width:440px;padding:32px;border:1px solid var(--line);border-radius:10px;background:var(--panel);text-align:center}.card h1{margin:0 0 8px;font-size:22px}.muted,.card p{color:var(--muted)}.warn{color:var(--warn)!important}.btn{display:inline-block;padding:9px 18px;border:0;border-radius:6px;background:var(--accent);color:#fff;font-weight:600;text-decoration:none;cursor:pointer}.btn:disabled{opacity:.5;cursor:default}.link{background:none;border:0;color:var(--muted);cursor:pointer;text-decoration:underline;padding:0 0 0 12px}.link:disabled{opacity:.4;cursor:default}.shell{max-width:920px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:0 16px}header{display:flex;justify-content:space-between;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}.who{color:var(--muted)}.desks{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px;margin-top:16px}.desks button{text-align:left;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--panel);cursor:pointer}.desks button.on{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.desks small{display:block;color:var(--muted)}.focus{color:var(--muted);font-size:13px;margin:10px 2px 0}.lessons{margin-top:12px;padding:10px 14px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.lessons summary{cursor:pointer;font-weight:600}.lessons ol{padding-left:20px}.lessons li{margin:6px 0}.lessons li.off span{color:var(--muted);text-decoration:line-through}.lessons small{color:var(--muted)}a.link{padding:0}.library{margin-top:14px;padding-top:10px;border-top:1px solid var(--line)}.library h4{margin:0 0 4px}.library .upload{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:8px 0}.library select,.library input[type=text]{padding:7px 9px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--text);font:inherit}.library input[type=file]{color:var(--muted);max-width:100%}.library .docs{width:100%;border-collapse:collapse;margin-top:6px}.library .docs td{padding:7px 6px;border-top:1px solid var(--line);vertical-align:top}.library .docs tr.off td{color:var(--muted)}.library .kind{display:inline-block;padding:1px 8px;border:1px solid var(--accent);border-radius:10px;color:var(--accent);font-size:12px}.library .acts{white-space:nowrap;text-align:right}.library .suggest{margin-top:10px;padding:10px;border:1px solid var(--accent);border-radius:8px}.library .suggest label{display:block;margin:6px 0}.log{flex:1;padding:16px 0;display:flex;flex-direction:column;gap:12px}.empty{color:var(--text);padding:24px;border:1px dashed var(--line);border-radius:10px}.msg{padding:12px 14px;border-radius:10px;max-width:100%}.msg.user{align-self:flex-end;background:#13213d;max-width:85%}.msg.assistant{background:var(--panel);border:1px solid var(--line)}.msg.error{border-color:var(--bad);color:var(--bad)}.msg.pending{color:var(--muted)}.text{white-space:pre-wrap;overflow-wrap:anywhere}.tag{font-size:12px;color:var(--accent);font-weight:600;margin-bottom:4px}.steps{margin:0 0 8px;padding-left:18px;color:var(--muted);font-size:13px}footer{position:sticky;bottom:0;background:var(--bg);padding:12px 0 16px;border-top:1px solid var(--line)}textarea{width:100%;resize:vertical;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--text);font:inherit}.actions{display:flex;align-items:center;margin-top:8px}.session-no{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;color:var(--accent);padding-right:10px}.sessions{margin-top:10px;border:1px solid var(--line);border-radius:8px;background:var(--panel);max-height:260px;overflow:auto}.session-row{display:block;width:100%;text-align:left;padding:8px 12px;border:0;border-bottom:1px solid var(--line);background:none;cursor:pointer}.session-row:hover{background:#13213d}.session-row small{color:var(--muted);padding-left:6px}