:root{--bg: #0e1116;--panel: #161b22;--line: #283041;--txt: #e6edf3;--muted: #8b949e;--accent: #2f81f7;--ok: #2ea043}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--txt)}.app{display:flex;flex-direction:column;height:100dvh;max-width:720px;margin:0 auto}header{padding:16px;border-bottom:1px solid var(--line)}header h1{margin:0;font-size:20px}.sub{margin:2px 0 8px;color:var(--muted);font-size:13px}.badge{font-size:11px;color:var(--ok);border:1px solid var(--line);padding:3px 8px;border-radius:999px}.chat{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}.empty{color:var(--muted);font-size:14px;text-align:center;margin-top:30%;padding:0 24px}.bubble{padding:10px 14px;border-radius:14px;max-width:85%;font-size:15px;line-height:1.4}.bubble.user{align-self:flex-end;background:var(--accent)}.bubble.system{align-self:flex-start;background:var(--panel);border:1px solid var(--line)}footer{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:var(--panel);padding-bottom:max(12px,env(safe-area-inset-bottom))}footer input{flex:1;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:16px}footer button{border:none;border-radius:12px;font-size:15px;padding:0 16px;cursor:pointer;color:#fff}.send{background:var(--accent)}.mic{background:var(--panel);border:1px solid var(--line)!important;font-size:18px;padding:0 14px}.answer{align-self:flex-start;max-width:92%;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px 16px}.markdown{font-size:15px;line-height:1.5}.markdown h1,.markdown h2,.markdown h3{font-size:16px;margin:8px 0 4px}.markdown p{margin:6px 0}.markdown ul,.markdown ol{margin:6px 0;padding-left:20px}.markdown strong{color:#fff}.citations{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}.cit-title{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px}.cit{display:flex;gap:8px;align-items:flex-start;margin:5px 0;font-size:13px}.cit-marker{background:var(--accent);color:#fff;border-radius:6px;min-width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;flex-shrink:0}.cit-body{color:var(--txt)}.thinking{display:flex;gap:5px}.thinking .dot{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:blink 1.2s infinite both}.thinking .dot:nth-child(2){animation-delay:.2s}.thinking .dot:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.2}40%{opacity:1}}.speak{margin-top:10px;background:transparent;border:1px solid var(--line);color:var(--txt);border-radius:10px;padding:6px 12px;font-size:13px;cursor:pointer}.speak:disabled{opacity:.6}.mic{background:var(--panel);border:1px solid var(--line)!important;font-size:16px;padding:0 14px;color:var(--txt);white-space:nowrap}.mic.on{background:#b3261e;color:#fff;border-color:#b3261e!important;animation:pulse 1.2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.login{display:flex;align-items:center;justify-content:center;height:100dvh;padding:20px}.login-card{width:100%;max-width:360px;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px 24px;display:flex;flex-direction:column;gap:12px}.login-card h1{margin:0;font-size:22px;text-align:center}.login-card .sub{margin:0 0 8px;text-align:center}.login-card input{padding:12px 14px;border-radius:10px;font-size:16px;border:1px solid var(--line);background:var(--bg);color:var(--txt)}.login-card button{padding:12px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-size:15px;cursor:pointer}.login-err{color:#ff7b72;font-size:13px;text-align:center}.head-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:6px}.logout{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:8px;padding:4px 10px;font-size:12px;cursor:pointer}.study-select{background:var(--bg);color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:13px}.who{font-size:11px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:55%}.tabs{display:flex;gap:6px;margin-top:10px}.tab{flex:1;background:var(--bg);border:1px solid var(--line);color:var(--muted);border-radius:8px;padding:7px;font-size:13px;cursor:pointer}.tab.on{background:var(--accent);color:#fff;border-color:var(--accent)}.docs{padding:4px 0;display:flex;flex-direction:column;gap:16px}.upload{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;display:flex;flex-direction:column;gap:8px}.upload-title{font-size:14px;font-weight:600;margin-bottom:2px}.upload input[type=text],.upload input:not([type]){padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:15px}.upload input[placeholder]{padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:15px}.upload button{padding:10px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-size:14px;cursor:pointer}.upload button:disabled{opacity:.6}.upload-status{font-size:13px;color:var(--muted)}.doc-list{display:flex;flex-direction:column;gap:8px}.empty-small{color:var(--muted);font-size:14px;padding:8px 0}.doc-row{display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 14px}.doc-main{flex:1;min-width:0}.doc-title{font-size:14px}.doc-meta{display:flex;gap:8px;font-size:12px;color:var(--muted);margin-top:3px;flex-wrap:wrap;align-items:center}.st{border-radius:6px;padding:1px 6px;font-size:11px}.st-indexed{background:#2ea04333;color:#3fb950}.st-processing,.st-uploaded{background:#bb800933;color:#d29922}.st-failed{background:#f8514933;color:#f85149}.pdf-btn{background:transparent;border:1px solid var(--line);color:var(--txt);border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer;white-space:nowrap}.cit-code{color:var(--muted)}.history{display:flex;flex-direction:column;gap:8px;padding:4px 0}.hist-item{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.hist-head{display:flex;justify-content:space-between;gap:10px;padding:12px 14px;cursor:pointer}.hist-q{font-size:14px;flex:1}.hist-date{font-size:11px;color:var(--muted);white-space:nowrap}.hist-body{padding:0 14px 12px;border-top:1px solid var(--line)}.user-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 14px;display:flex;flex-direction:column;gap:10px}.user-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}.assign-chips{display:flex;flex-wrap:wrap;gap:6px}.chip{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:3px 6px 3px 10px;font-size:12px;display:inline-flex;align-items:center;gap:4px}.chip button{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:14px;line-height:1;padding:0 2px}.assign-add{display:flex;gap:6px}.assign-add input{flex:1;min-width:0;padding:8px 10px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:14px}.assign-add select{padding:8px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:13px}.queue{display:flex;flex-direction:column;gap:8px;margin-top:8px}.qrow{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:8px 10px;display:flex;flex-direction:column;gap:6px}.qfile{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qfields{display:flex;gap:6px;align-items:center}.qfields input{flex:1;min-width:0;padding:7px 9px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--txt);font-size:13px}.mini{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:8px;padding:6px 8px;font-size:11px;cursor:pointer;white-space:nowrap}.hist-user{font-size:11px;color:var(--accent);margin-top:2px}.calc-field{display:flex;flex-direction:column;gap:4px}.calc-field label{font-size:13px;color:var(--muted)}.calc-field input,.calc-field select{padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--txt);font-size:15px}.calc-results{margin-top:10px;border-top:1px solid var(--line);padding-top:10px;display:flex;flex-direction:column;gap:6px}.calc-res{display:flex;justify-content:space-between;align-items:center;padding:8px 10px;border-radius:8px;background:var(--bg);font-size:14px}.calc-res.final{background:#2ea04326;border:1px solid rgba(46,160,67,.4)}.calc-res strong{font-size:15px}.builder-row{display:flex;flex-wrap:wrap;gap:6px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:8px}.builder-row input,.builder-row select,.builder-row textarea{padding:7px 9px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--txt);font-size:13px}.builder-row>input{flex:1;min-width:120px}.builder-row textarea{width:100%;min-height:48px;font-family:inherit}.op-line{display:flex;gap:6px;align-items:center;width:100%;flex-wrap:wrap}.op-line select{flex:1;min-width:90px}.cnum{width:70px}