:root{--ink:#182538;--muted:#66758b;--line:#e1e6ed;--paper:#fff;--page:#f5f7fa;--accent:#285dba;--soft:#eaf1ff;--danger:#b23538;--radius:14px;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--page);font-synthesis:none}*{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.65}button,input,textarea,select{font:inherit}button{cursor:pointer;border:1px solid var(--line);background:white;border-radius:9px;padding:9px 14px;color:var(--ink)}button:hover{background:#f1f4f8}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #9dbefa;outline-offset:2px}a{color:var(--accent)}input,textarea,select{width:100%;border:1px solid #cbd3df;border-radius:9px;background:white;color:var(--ink);padding:11px 13px;line-height:1.5}textarea{resize:vertical}label{display:block;font-size:14px;font-weight:600;margin:16px 0 6px}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.4;letter-spacing:-.8px}h2{font-size:23px;line-height:1.45}h3{font-size:17px}small,.muted{color:var(--muted)}.muted{font-size:13px}.primary{background:var(--accent);color:white;border-color:var(--accent)}.primary:hover{background:#204d9d}.danger{color:var(--danger)}.small{font-size:13px;padding:5px 9px}.ghost{border-color:transparent;background:transparent}.brand{display:flex;gap:12px;align-items:center;font-weight:700;letter-spacing:.2px}.brandmark{width:34px;height:34px;background:var(--ink);color:white;border-radius:10px;display:grid;place-items:center;font-size:13px;letter-spacing:-.5px}.eyebrow{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:1.5px;margin-bottom:14px}.demo-banner{background:#fff0c9;color:#6d4d0e;padding:8px 20px;text-align:center;font-size:13px}.login-page{max-width:1080px;min-height:90vh;margin:auto;padding:48px 32px}.login-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:90px;align-items:center;margin:65px 0 30px}.login-copy h1{font-size:39px}.login-copy p{color:var(--muted);max-width:420px;font-size:16px}.steps{display:grid;gap:16px;margin-top:36px}.step{display:flex;gap:16px;align-items:flex-start}.step-number{font-size:13px;background:#e7edf5;padding:4px 9px;border-radius:8px;color:var(--muted)}.step b{display:block;font-size:15px}.login-card{background:white;padding:28px 32px;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 36px #253b5a08}.login-card h2{margin-bottom:4px}.login-card button[type=submit]{width:100%;margin-top:22px}.mode-link{margin-top:12px;width:100%;font-size:13px}.form-error{color:var(--danger);font-size:13px;margin-top:12px;min-height:20px;white-space:pre-wrap}.fineprint{border-top:1px solid var(--line);padding-top:18px;font-size:12px;color:var(--muted);margin-top:32px;max-width:900px}.topbar{height:74px;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:0 28px;border-bottom:1px solid var(--line);background:white}.who{display:flex;align-items:center;gap:13px;font-size:14px}.who .muted{font-size:12px}.workspace{display:grid;grid-template-columns:248px minmax(0,1fr);height:calc(100vh - 74px)}.sidebar{padding:22px 16px;background:#f5f7fa;border-right:1px solid var(--line);display:flex;flex-direction:column;overflow:auto;gap:14px}.sidebar .primary{width:100%}.nav-label{font-size:11px;letter-spacing:1px;color:var(--muted);margin:8px 8px 0}.history-list{display:grid;gap:6px;align-content:start;flex:1;overflow:auto}.history-item{text-align:left;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;background:transparent;border-color:transparent;font-size:14px}.history-item.active{background:white;border-color:var(--line);color:var(--accent)}.usage-box{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding:15px 7px 0}.usage-box strong{font-size:18px;display:block;color:var(--ink)}.chat-pane{display:flex;flex-direction:column;min-width:0;background:white;min-height:0}.chat-top{padding:14px 28px;border-bottom:1px solid #eef1f5;display:flex;gap:12px;align-items:center;justify-content:space-between}.chat-top strong{font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-feed{flex:1;overflow:auto;padding:30px max(28px,calc((100% - 820px)/2));scroll-behavior:smooth}.welcome{max-width:690px;margin:8vh auto}.welcome h2{font-size:29px}.welcome p{color:var(--muted)}.examples{display:grid;gap:10px;margin-top:30px}.example{text-align:left;padding:15px 18px;background:#fbfcfe;font-size:14px}.turn{margin:0 0 34px}.message-user{max-width:85%;background:var(--soft);padding:12px 17px;border-radius:14px 14px 3px 14px;white-space:pre-wrap;overflow-wrap:anywhere;margin-left:auto}.assistant{margin-top:19px}.assistant-label{font-size:12px;color:var(--muted);margin-bottom:9px;font-weight:600}.prose{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.85}.codebox{margin:15px 0;background:#f4f6f9;border:1px solid var(--line);border-radius:10px;overflow:hidden}.codehead{display:flex;align-items:center;justify-content:space-between;padding:6px 12px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}pre{white-space:pre;overflow:auto;margin:0;padding:16px;font-size:13px;line-height:1.6;font-family:ui-monospace,"Cascadia Code",Consolas,monospace;tab-size:2}.message-actions{display:flex;gap:14px;align-items:center;margin-top:10px;flex-wrap:wrap}.message-actions small{font-size:11px}.pending{color:var(--muted);font-size:14px}.pending::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:9px;animation:pulse 1.5s infinite}.inline-error{background:#fff3f2;color:var(--danger);border-radius:9px;padding:12px;font-size:14px}.composer-wrap{padding:12px max(28px,calc((100% - 820px)/2)) 18px;border-top:1px solid #eef1f5}.composer{display:flex;gap:12px;align-items:flex-end;border:1px solid #b9c7db;border-radius:13px;padding:10px 12px;background:white}.composer textarea{border:0;resize:none;max-height:160px;min-height:68px;padding:4px;outline:0;box-shadow:none}.composer textarea:focus-visible{outline:0}.composer button{margin-bottom:1px;flex-shrink:0}.composer-note{display:flex;gap:12px;justify-content:space-between;margin-top:8px;font-size:11px;color:var(--muted)}.admin-page{max-width:1250px;margin:28px auto;padding:0 28px}.admin-intro{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px}.admin-intro h2{margin-bottom:5px}.admin-grid{display:grid;grid-template-columns:260px minmax(0,1fr);gap:22px}.panel{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:white}.class-list{display:grid;gap:10px}.class-item{text-align:left;white-space:normal;padding:14px}.class-item b{display:block}.class-item.active{background:var(--soft);border-color:#a5bde7}.class-meta{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.class-meta h2{margin-bottom:4px}.badge{display:inline-block;border:1px solid var(--line);border-radius:6px;padding:2px 7px;font-size:12px;background:#f7f9fc}.badge.open{color:#246942;background:#eef9f3;border-color:#c5e4d0}.code-large{font-size:20px;letter-spacing:2px;font-family:ui-monospace,monospace;font-weight:700}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.statline{display:flex;gap:24px;flex-wrap:wrap;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:18px 0}.statline strong{display:block;font-size:23px;line-height:1.25}.statline span{font-size:12px;color:var(--muted)}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;padding:12px 8px;border-bottom:1px solid var(--line);vertical-align:middle;white-space:nowrap}th{font-weight:500;color:var(--muted);font-size:12px}td.actions{white-space:normal;min-width:188px}.actions button{margin:2px 3px 2px 0}.empty{color:var(--muted);padding:45px 16px;text-align:center;font-size:14px}.dialog-backdrop{position:fixed;inset:0;background:#15233766;display:grid;place-items:center;z-index:20;padding:20px}.dialog{background:white;max-width:620px;width:100%;border-radius:16px;padding:28px;max-height:88vh;overflow:auto}.dialog h2{font-size:22px}.dialog .toolbar{justify-content:flex-end}.dialog table{margin-top:10px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:100;background:#213148;color:white;padding:12px 20px;border-radius:10px;font-size:14px;max-width:90vw;white-space:pre-wrap;box-shadow:0 6px 25px #0002}.warning{background:#fff7e3;border:1px solid #ead8a5;border-radius:9px;padding:12px 14px;color:#73541c;font-size:13px;margin-top:16px}.only-mobile{display:none}[hidden]{display:none!important}@keyframes pulse{50%{opacity:.25}}@media(max-width:820px){.login-grid{gap:35px;margin-top:35px}.login-copy h1{font-size:30px}.login-card{padding:22px}.workspace{grid-template-columns:200px 1fr}.admin-grid{grid-template-columns:1fr}.class-list{grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}.chat-feed{padding:22px}.composer-wrap{padding:12px 20px}.topbar{padding:0 18px}.admin-page{padding:0 18px}}@media(max-width:600px){.login-page{padding:25px 20px}.login-grid{grid-template-columns:1fr;gap:25px;margin-top:35px}.login-copy .steps{display:none}.login-copy h1{font-size:28px}.login-copy p{font-size:14px}.login-card{padding:24px}.fineprint{margin-top:22px}.topbar{height:68px;gap:8px}.brand{gap:8px;font-size:13px}.brandmark{width:29px;height:29px}.who{gap:6px;font-size:12px}.who .muted{display:none}.workspace{grid-template-columns:1fr;height:calc(100vh - 68px)}.sidebar{display:none}.sidebar.mobile-open{position:fixed;top:68px;bottom:0;left:0;width:250px;z-index:10;display:flex;box-shadow:5px 0 30px #0002}.only-mobile{display:block}.chat-top{padding:11px 16px}.chat-top strong{max-width:50vw}.chat-feed{padding:20px}.welcome{margin:5vh auto}.welcome h2{font-size:25px}.composer-wrap{padding:10px 13px 15px}.composer-note{font-size:10px}.message-user{max-width:92%}.admin-page{margin-top:20px}.admin-intro{align-items:flex-start}.admin-intro h2{font-size:20px}.admin-grid{gap:16px}.panel{padding:16px}.class-meta{gap:12px}.statline{gap:18px}.dialog{padding:20px}.demo-banner{font-size:11px}.toolbar{gap:7px}}
.login-copy h1{white-space:pre-line}