.chat-app{--background: rgb(255, 255, 255);--foreground: rgb(41, 41, 41);--sidebar: rgb(248, 248, 248);--border: rgb(233, 233, 233);--surface-hover: rgb(240, 240, 240);--muted-foreground: rgb(112, 112, 112);--brand: rgb(124, 157, 255);--brand-hover: rgb(100, 137, 245);--composer-border: rgb(215, 215, 215);--user-avatar-background: rgb(238, 243, 251);--user-avatar-border: rgb(216, 226, 242);--user-avatar-foreground: rgb(59, 99, 165);--danger: rgb(180, 55, 45);--font-sans: "SF Pro SC", "SF Pro Text", "PingFang SC", "Segoe UI", "Noto Sans CJK SC", system-ui, sans-serif;height:100dvh;min-height:0;display:grid;grid-template-columns:260px minmax(0,1fr);overflow:hidden;color:var(--foreground);background:var(--background);color-scheme:light;font:14px/1.5 var(--font-sans)}.chat-app *,.chat-app *:before,.chat-app *:after{box-sizing:border-box}.chat-app button,.chat-app textarea{font:inherit}.chat-app button{cursor:pointer}.chat-app button:disabled{cursor:default;opacity:.45}.chat-app button:focus-visible,.chat-app textarea:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.chat-app .sidebar{min-height:0;display:flex;flex-direction:column;border-right:1px solid var(--border);background:var(--sidebar)}.chat-app .session-toolbar{height:64px;flex:none;display:flex;align-items:center;gap:8px;padding:0 16px;border-bottom:1px solid var(--border)}.chat-app .toolbar-current,.chat-app .session-toolbar button{width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:7px;background:transparent;color:var(--muted-foreground)}.chat-app .toolbar-current{color:var(--foreground);background:var(--border)}.chat-app .toolbar-title{flex:1;font-size:13px;font-weight:600}.chat-app .lab-story-select{flex:none}.chat-app .session-toolbar button:hover{color:var(--foreground);background:var(--border)}.chat-app .session-list{flex:1;min-height:0;overflow-y:auto;padding:12px 8px}.chat-app .session-item{display:block;width:100%;overflow:hidden;margin:0 0 2px;padding:10px 12px;border:0;border-radius:8px;background:transparent;color:var(--foreground);text-align:left;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.chat-app .session-item:hover{background:var(--surface-hover)}.chat-app .session-item[aria-current=page]{background:var(--border);font-weight:600}.chat-app .disconnect{flex:none;display:flex;align-items:center;gap:10px;width:calc(100% - 16px);margin:8px;padding:10px 12px;border:0;border-top:1px solid var(--border);border-radius:0;background:transparent;color:var(--muted-foreground);text-align:left;font-size:12px}.chat-app .disconnect:hover{color:var(--foreground)}.chat-app .sidebar-scrim{display:none}.chat-app .conversation{min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr) auto}.chat-app .conversation-header{min-height:76px;display:flex;align-items:center;padding:14px 28px;border-bottom:1px solid var(--border);background:var(--sidebar)}.chat-app .conversation-heading{min-width:0}.chat-app .conversation-heading h1{overflow:hidden;margin:0;color:var(--foreground);text-overflow:ellipsis;white-space:nowrap;font-size:16px;font-weight:600;line-height:1.35}.chat-app .conversation-heading p{margin:3px 0 0;color:var(--muted-foreground);font-size:12px}.chat-app .mobile-menu{display:none}.chat-app .messages{min-height:0;display:flex;flex-direction:column;overflow-y:auto;overscroll-behavior-y:contain}.chat-app .messages-inner{width:min(100%,920px);display:flex;flex-direction:column;margin:0 auto;padding:18px 28px 32px}.chat-app .empty-chat{flex:1;display:grid;align-content:center;justify-items:center;padding:32px;text-align:center}.chat-app .empty-chat h2{margin:0;font-size:20px;font-weight:600}.chat-app .empty-chat p{margin:8px 0 0;color:var(--muted-foreground);font-size:13px}.chat-app .message{padding:10px 0 18px}.chat-app .message-role{display:flex;align-items:center;gap:8px;color:var(--foreground);font-size:12px}.chat-app .message-role strong{font-weight:600}.chat-app .message-avatar{width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:50%;background:var(--sidebar);color:var(--muted-foreground);font-size:10px;font-weight:600}.chat-app .message-avatar.user{color:var(--user-avatar-foreground);background:var(--user-avatar-background);border-color:var(--user-avatar-border)}.chat-app .message-body{padding:8px 0 0 32px;color:var(--foreground);white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.7}.chat-app .status-text{align-self:center;padding:8px;color:var(--muted-foreground);font-size:12px}.chat-app .typing{color:var(--muted-foreground)}.chat-app .reconnect{align-self:center;display:flex;align-items:center;gap:8px;margin:16px;color:var(--danger);font-size:12px}.chat-app .reconnect button{padding:5px 10px;border:1px solid var(--border);border-radius:6px;background:var(--sidebar);color:var(--foreground)}.chat-app .composer{width:min(calc(100% - 48px),920px);margin:0 auto 20px;border:1px solid var(--composer-border);border-radius:12px;background:var(--background)}.chat-app .composer:focus-within{border-color:var(--brand)}.chat-app .composer textarea{display:block;width:100%;min-height:56px;max-height:200px;padding:14px 16px 4px;resize:none;border:0;outline:0;background:transparent;color:var(--foreground);font-size:14px;line-height:1.5}.chat-app .composer textarea::placeholder{color:var(--muted-foreground)}.chat-app .composer-footer{display:flex;align-items:center;justify-content:space-between;padding:4px 10px 10px 16px;color:var(--muted-foreground);font-size:11px}.chat-app .send{width:32px;height:32px;display:grid;place-items:center;border:0;border-radius:8px;background:var(--brand);color:#fff}.chat-app .send:hover:not(:disabled){background:var(--brand-hover)}.chat-app .disconnect-dialog{width:min(calc(100% - 32px),360px);padding:24px;border:1px solid var(--border);border-radius:10px;background:var(--background);color:var(--foreground);box-shadow:0 12px 32px #00000029}.chat-app .disconnect-dialog::backdrop{background:#00000073}.chat-app .disconnect-dialog h2{margin:0;font-size:17px;font-weight:600}.chat-app .disconnect-dialog p{margin:8px 0 24px;color:var(--muted-foreground);font-size:13px}.chat-app .dialog-actions{display:flex;justify-content:flex-end;gap:8px}.chat-app .dialog-actions button{padding:8px 12px;border:1px solid var(--border);border-radius:7px;background:var(--background);color:var(--foreground);font-size:13px}.chat-app .dialog-actions .dialog-confirm{border-color:var(--foreground);background:var(--foreground);color:var(--background)}@media(prefers-color-scheme:dark){.chat-app{--background: rgb(17, 17, 17);--foreground: rgb(235, 235, 235);--sidebar: rgb(27, 27, 27);--border: rgb(57, 57, 57);--surface-hover: rgb(40, 40, 40);--muted-foreground: rgb(165, 165, 165);--composer-border: rgb(75, 75, 75);--user-avatar-background: rgb(35, 45, 62);--user-avatar-border: rgb(58, 77, 102);--user-avatar-foreground: rgb(166, 193, 239);--danger: rgb(239, 120, 108);color-scheme:dark}}@media(max-width:700px){.chat-app{grid-template-columns:1fr}.chat-app .sidebar{display:none}.chat-app .sidebar.mobile-open{position:fixed;z-index:3;inset:0 auto 0 0;display:flex;width:min(280px,85vw)}.chat-app .sidebar-scrim{position:fixed;z-index:2;inset:0;display:block;width:100%;border:0;background:#00000073}.chat-app .conversation-header{min-height:64px;gap:12px;padding:10px 16px}.chat-app .mobile-menu{width:32px;height:32px;display:grid;place-items:center;flex:none;border:0;background:transparent;color:var(--foreground)}.chat-app .messages-inner{padding:16px 18px 28px}.chat-app .composer{width:calc(100% - 24px);margin-bottom:max(12px,env(safe-area-inset-bottom))}}:root{--page-background: #fff;--page-foreground: #292929;--page-muted: #707070;--page-border: #d7d7d7;color:var(--page-foreground);background:var(--page-background);color-scheme:light;font-family:SF Pro SC,SF Pro Text,PingFang SC,Segoe UI,Noto Sans CJK SC,system-ui,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid #7c9dff;outline-offset:2px}.center-page,.auth-page{min-height:100dvh;display:grid;place-items:center;padding:24px}.muted{color:var(--page-muted)}.auth-card{width:min(100%,420px)}.wordmark{color:var(--page-foreground);font-size:12px;font-weight:700;letter-spacing:.16em}.auth-card h1{margin:24px 0 10px;font-size:clamp(30px,8vw,42px);font-weight:600;line-height:1.15;letter-spacing:-.025em}.auth-card>p{margin:0 0 32px;color:var(--page-muted);line-height:1.6}.auth-card form{display:grid;gap:10px}.auth-card label{font-size:13px;font-weight:600}.auth-card input{width:100%;padding:15px;border:1px solid var(--page-border);border-radius:8px;background:var(--page-background);color:var(--page-foreground);font:600 22px/1 ui-monospace,monospace;letter-spacing:.12em;text-transform:uppercase}.auth-card small{display:block;margin-top:20px;color:var(--page-muted);line-height:1.5}.primary{padding:14px 18px;border:0;border-radius:8px;background:var(--page-foreground);color:var(--page-background);font-weight:600}.primary:disabled{opacity:.4;cursor:default}.form-error{color:#b4372d;font-size:14px}.lab-stage{height:100dvh}.lab-stage .chat-app{height:100%}.lab-story-select{max-width:138px;height:32px;padding:0 8px;border:1px solid var(--page-border);border-radius:7px;background:var(--page-background);color:var(--page-foreground);font-family:inherit;font-size:12px}@media(prefers-color-scheme:dark){:root{--page-background: #111;--page-foreground: #ebebeb;--page-muted: #a5a5a5;--page-border: #393939;color-scheme:dark}}.picker select{display:block;width:100%;margin:10px 0 24px;padding:12px;border:1px solid var(--page-border);border-radius:8px;background:var(--page-background);color:var(--page-foreground);font:inherit}.bot-list{list-style:none;padding:0;margin:0 0 24px;border-top:1px solid var(--page-border)}.bot-list button{width:100%;padding:18px 0;text-align:left;color:inherit;background:none;border:0;border-bottom:1px solid var(--page-border)}.bot-list button:hover{color:var(--page-muted)}.bot-list button:disabled{opacity:.5;cursor:wait}.text-button{padding:8px 0;border:0;background:none;color:var(--page-muted)}.login-link{display:inline-block;text-decoration:none}