/* AI owns its surfaces and interaction states; shared styles load first. */
:root{--paper:#090909;--ink:#f2f2f2;--muted:#999;--line:#292929;--accent:#e8e8e8}
*{box-sizing:border-box}
body.ai-page{--paper:#090909;--ink:#f2f2f2;--muted:#999;--line:#292929;--accent:#e8e8e8;--gold:#e8e8e8;display:flex;flex-direction:column;height:100dvh;min-height:0;margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 Inter,system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color-scheme:dark}
.ai-page button,.ai-page textarea{font:inherit}
#ai-page-root{display:contents}
.ai-page button{cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.ai-page button:disabled{cursor:not-allowed;opacity:.45}
.ai-page a{color:inherit;text-decoration:none}
.ai-page :focus-visible{outline:2px solid #bcbcbc;outline-offset:3px}
.ai-page ::selection{background:#454545;color:#fff}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.ai-topbar{flex-shrink:0}
.ai-topbar #ai-status{font-size:12px;color:var(--muted)}
.ai-topbar .page-intro{align-items:center}
.ai-topbar .page-intro p{margin-top:8px}
.ai-topbar .page-intro-actions button{border:1px solid var(--line);border-radius:12px;background:#171717;color:var(--ink);font-weight:500;box-shadow:none}
.ai-topbar .page-intro-actions button:hover{background:#252525;border-color:#444}
#ai-menu{display:none}
.ai-app{display:grid;grid-template-columns:240px minmax(0,1fr);flex:1;min-height:240px;width:min(1280px,calc(100% - 96px));margin:0 auto 24px;border:1px solid var(--line);border-radius:16px;background:#0e0e0e}
.ai-sidebar{display:flex;flex-direction:column;gap:18px;min-width:0;min-height:0;overflow-y:auto;padding:22px 16px;background:#111;border-right:1px solid var(--line);border-radius:16px 0 0 16px;color:var(--ink)}
.ai-sidebar-head{display:flex;align-items:center;justify-content:space-between}
.ai-brand{padding:3px 10px;color:#bbb;font-size:16px;font-weight:500;letter-spacing:-.02em}
.ai-brand span{color:var(--ink)}
.ai-sidebar-head,.ai-new,.ai-sidebar-label,.ai-sidebar-note{flex-shrink:0}
.ai-close,.ai-overlay{display:none}
.ai-new{min-height:46px;padding:10px 14px;border:1px solid #363636;border-radius:12px;background:#202020;color:var(--ink);font-size:14px;font-weight:500;text-align:left}
.ai-new span{margin-right:7px;font-size:20px;vertical-align:-1px}
.ai-new:hover{background:#2a2a2a;border-color:#555}
.ai-sidebar-label{margin:0 10px -8px;font-size:11px;font-weight:400;letter-spacing:.04em;color:#888}
.ai-sidebar nav{display:flex;flex-direction:column;gap:5px;min-height:0;overflow-y:auto;scrollbar-width:thin}
.ai-sidebar nav button{min-height:44px;padding:10px 12px;border:1px solid transparent;border-radius:12px;background:transparent;color:#aaa;font-size:13px;font-weight:400;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ai-sidebar nav button:hover{background:#202020;color:#eee;border-color:#303030}
.ai-sidebar nav button[aria-current=true]{background:#252525;border-color:#3b3b3b;color:#f2f2f2}
.ai-sidebar nav button[aria-current=true]:hover{background:#2d2d2d;border-color:#494949}
.ai-sidebar-note{margin:auto 10px 0;font-size:11px;line-height:1.7;color:#888}
.ai-main{display:flex;flex-direction:column;min-width:0;min-height:0}
.ai-messages{display:flex;flex-direction:column;gap:22px;flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:32px max(24px,calc((100% - 820px)/2)) 18px;scrollbar-width:thin}
.ai-empty{margin:auto;max-width:530px;text-align:center}

.ai-empty h1{margin:12px 0 8px;color:#eee;font-size:28px;font-weight:500;letter-spacing:-.04em;line-height:1.3}
.ai-empty p{color:var(--muted);font-size:14px;line-height:1.8}
.ai-message{max-width:85%;font-size:15px;line-height:1.75;white-space:pre-wrap;overflow-wrap:anywhere}
.ai-message.user{align-self:flex-end;padding:12px 16px;border:1px solid #343434;border-radius:16px;background:#222;color:#eee}
.ai-message.assistant{align-self:flex-start;max-width:100%;padding:3px 0;color:#ddd}
.ai-message.assistant::before{content:'✦';display:inline-grid;place-items:center;width:26px;height:26px;margin-right:10px;border:1px solid #303030;border-radius:12px;background:#1c1c1c;color:#ccc;font-size:15px;vertical-align:top}
.ai-message.assistant .ai-content{display:inline-block;width:calc(100% - 42px);vertical-align:top}
.ai-message small{display:block;margin-top:8px;color:var(--muted);font-size:11px}
.ai-message button{min-height:36px;margin-top:8px;padding:5px 12px;border:1px solid #3c3c3c;border-radius:12px;background:#202020;color:#eee;font-size:12px;font-weight:400}
.ai-message button:hover{background:#2a2a2a;border-color:#555}
.ai-message.pending{min-width:140px}
.ai-message.pending .ai-content{color:var(--muted)}
.ai-composer-wrap{flex-shrink:0;padding:12px max(24px,calc((100% - 820px)/2)) 18px;background:transparent}
.ai-composer{border:1px solid #353535;border-radius:16px;background:#171717;box-shadow:none;transition:border-color .15s}
.ai-composer:focus-within{border-color:#777;box-shadow:0 0 0 1px #777}
.ai-composer textarea{display:block;width:100%;min-height:70px;max-height:160px;resize:none;padding:16px 16px 4px;border:0;border-radius:16px;background:transparent;color:var(--ink);outline:0;box-shadow:none;font-size:15px;line-height:1.6}
.ai-composer textarea:focus,.ai-composer textarea:focus-visible{border:0;outline:0;box-shadow:none}
.ai-composer textarea::placeholder{color:#818181}
.ai-compose-bottom{display:flex;align-items:center;gap:10px;padding:6px 10px 10px}
.ai-compose-options{display:flex;align-items:center;gap:8px;min-width:0;flex:0 1 auto}
.ai-compose-bottom #ai-send{flex:none;margin-left:auto;min-height:44px;padding:8px 15px;border:1px solid #e8e8e8;border-radius:12px;background:#e8e8e8;color:#111;font-size:13px;font-weight:500}
.ai-compose-bottom #ai-send:hover:not(:disabled){background:#fff;border-color:#fff}
.ai-compose-bottom #ai-send span{margin-left:7px;color:inherit;font-size:15px}
.ai-queue{margin:8px 0 0;color:var(--muted);font-size:11px}
.ai-disclaimer{margin:9px 0 0;color:#888;font-size:11px;text-align:center}
#ai-error{margin:4px 0;color:#ccc;font-size:12px}
#ai-error:empty{display:none}
.ai-picker{display:inline-flex;align-items:center;gap:8px;min-width:0;min-height:44px;padding:8px 12px;border:1px solid #333;border-radius:12px;background:#202020;color:#ddd;font-size:13px;font-weight:400;line-height:1.3}

.ai-picker-model{flex:0 1 auto;max-width:224px}
.ai-picker:hover,.ai-picker[aria-expanded=true]{background:#2a2a2a;border-color:#555;color:#fff}
.ai-picker[aria-expanded=true]{box-shadow:0 0 0 1px #555}
.ai-picker-symbol{flex:none;color:#aaa;font-size:16px}
.ai-picker-value{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ai-picker-chevron{flex:none;width:6px;height:6px;margin-left:2px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:translateY(-2px) rotate(45deg)}
.ai-picker[aria-expanded=true] .ai-picker-chevron{transform:translateY(2px) rotate(225deg)}
.ai-picker-popup[hidden]{display:none}
.ai-picker-popup{position:fixed;z-index:80;display:flex;flex-direction:column;overflow:hidden;padding:8px;border:1px solid #404040;border-radius:16px;background:#171717;color:var(--ink);box-shadow:none}
.ai-picker-heading{flex:none;padding:7px 10px 9px;color:var(--muted);font-size:12px;font-weight:500}
.ai-picker-list{min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:3px;scrollbar-width:thin}
.ai-picker-option{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:48px;padding:10px;border:1px solid transparent;border-radius:12px;background:transparent;color:inherit;text-align:left}
.ai-picker-option+.ai-picker-option{margin-top:4px}
.ai-picker-option:hover{background:#242424;border-color:#333}
.ai-picker-option[aria-selected=true]{background:#2b2b2b;border-color:#454545}
.ai-picker-option:focus-visible{outline:2px solid #aaa;outline-offset:-2px;background:#303030}
.ai-picker-option-copy{min-width:0}
.ai-picker-option strong{display:block;font-size:13px;font-weight:500;line-height:1.5;overflow-wrap:anywhere}
.ai-picker-option small{display:block;margin-top:3px;color:var(--muted);font-size:12px;font-weight:400;line-height:1.5}
.ai-picker-check{flex:none;width:18px;color:#ddd;font-size:16px}
.ai-picker-hint{flex:none;margin:7px 3px 0;padding:9px 7px 3px;border-top:1px solid #333;color:var(--muted);font-size:11px;line-height:1.5}
@media(max-width:900px){.ai-app{width:calc(100% - 48px)}}
@media(max-width:740px){
 .ai-app{grid-template-columns:minmax(0,1fr);margin-bottom:12px}
 .ai-sidebar{position:fixed;inset:0 auto 0 0;z-index:71;width:min(290px,85vw);padding:20px 16px;border-radius:0 16px 16px 0;transform:translateX(-105%);transition:transform .2s;box-shadow:none}
 .ai-sidebar.open{transform:translateX(0)}
 .ai-overlay:not([hidden]){display:block;position:fixed;inset:0;z-index:70;width:100%;height:100%;padding:0;border:0;background:#0009;cursor:pointer}
 .ai-close{display:inline-grid;place-items:center;min-width:44px;min-height:44px;padding:0;border:1px solid #3a3a3a;border-radius:12px;background:#1b1b1b;color:#eee;font-size:26px;line-height:1}
 .ai-close:hover{background:#2a2a2a;border-color:#555}
 #ai-menu{display:inline-flex;align-items:center;min-width:44px;min-height:44px;padding:0 10px;font-size:21px}
 .ai-topbar .page-intro{flex-direction:row;align-items:center;gap:12px}
 .ai-messages{padding:24px 16px 10px;gap:16px}
 .ai-empty h1{font-size:25px}
 .ai-message{max-width:93%}
 .ai-composer-wrap{padding:8px 10px calc(12px + env(safe-area-inset-bottom))}
 .ai-compose-bottom{gap:6px;padding:5px 8px 8px}
 .ai-compose-options{gap:6px}
 .ai-compose-bottom #ai-send{padding:8px 10px}
 .ai-compose-bottom #ai-send span{margin-left:3px}
 .ai-picker{gap:6px;padding:8px;font-size:12px}

 .ai-picker-model{max-width:154px}
 .ai-picker-symbol{display:none}
 .ai-disclaimer{font-size:10px}
}
@media(max-width:700px){.ai-app{width:calc(100% - 36px)}}
@media(max-height:700px){
 .ai-topbar .page-intro{flex-direction:row;align-items:center}
 .ai-topbar .page-intro p{margin:0;line-height:1.5}
 .ai-app{min-height:220px;margin-bottom:8px}
 .ai-sidebar{padding:12px;gap:10px}
 .ai-messages{padding:12px 16px;gap:12px}
 .ai-composer-wrap{padding:6px 10px}
 .ai-composer textarea{min-height:44px;height:52px;padding:10px 12px 4px}
 .ai-compose-bottom{padding:4px 8px;gap:6px}
 .ai-queue,.ai-disclaimer{margin-top:4px}

 .ai-empty h1{font-size:24px;margin:4px 0}
 .ai-empty p{margin:4px 0}
 .ai-sidebar-label{margin-bottom:0}
}
@media(max-height:450px){
 .ai-topbar .page-intro{padding:6px 0;margin-bottom:8px}
 .ai-app{min-height:0}
 .ai-sidebar nav{flex-shrink:0;min-height:44px}
 .ai-composer textarea{height:44px;min-height:44px}
 .ai-queue,.ai-disclaimer{font-size:10px;line-height:1.4}
}
@media(prefers-reduced-motion:reduce){.ai-page button,.ai-sidebar,.ai-composer{transition:none}}