:root{--bg:#FAF9F5;--side:#F3F1EA;--fg:#2b2a27;--muted:#73726c;--accent:#C96442;--border:#e4e1d8;--card:#fff;--code:#f1efe9;--user:#EDEAE0;--vh:100dvh;--vt:0px}
@media(prefers-color-scheme:dark){:root{--bg:#262624;--side:#1f1e1d;--fg:#ececea;--muted:#9a988f;--border:#3a3935;--card:#30302e;--code:#1f1e1d;--user:#35342f}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;width:100%;height:100%;overflow:hidden;overflow-x:hidden;overscroll-behavior:none;background:var(--bg);color:var(--fg);font:15px/1.6 -apple-system,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%}
body{position:fixed;left:0;right:0;top:var(--vt);height:var(--vh)}
#app{display:flex;height:100%;width:100%;overflow:hidden}
button{font-family:inherit}
#sidebar{width:260px;background:var(--side);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px;flex-shrink:0}
.brand{font-family:ui-serif,"New York","Tiempos Text",Georgia,"Times New Roman","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;font-size:20px;font-weight:600}
.side-head{padding:6px 8px 12px}
.new-btn{border:1px solid var(--border);background:var(--card);color:var(--accent);border-radius:10px;padding:9px;font-size:14px;cursor:pointer;font-weight:600}
.side-label{font-size:12px;color:var(--muted);margin:16px 8px 6px}
#convList{overflow-y:auto;flex:1;-webkit-overflow-scrolling:touch}
.conv{display:flex;align-items:center;border-radius:8px;gap:2px}
.conv:hover,.conv.active{background:var(--border)}
.conv .t{flex:1;min-width:0;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;background:none;border:none;color:var(--fg);padding:10px 8px;cursor:pointer}
.conv .more{background:none;border:none;color:var(--muted);font-size:18px;padding:6px 10px;cursor:pointer;border-radius:6px}
@media(hover:hover){.conv .more{visibility:hidden}.conv:hover .more,.conv.active .more{visibility:visible}}
.ctx{position:fixed;z-index:50;background:var(--card);border:1px solid var(--border);border-radius:10px;box-shadow:0 6px 20px #0003;padding:4px;min-width:120px}
.ctx button{display:block;width:100%;text-align:left;background:none;border:none;color:var(--fg);padding:10px 12px;border-radius:6px;font-size:14px;cursor:pointer}
.ctx button:hover{background:var(--border)}.ctx .danger{color:#c0392b}
main{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0}
.top{display:none}
#scroll{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
#chat{max-width:720px;margin:0 auto;padding:24px 16px 40px}
.empty{text-align:center;margin-top:18vh}
.empty .greet{font-family:ui-serif,"New York","Tiempos Text",Georgia,"Times New Roman","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;font-size:30px}
.empty small{display:block;font:15px sans-serif;color:var(--muted);margin-top:8px}
.msg.user{display:flex;justify-content:flex-end;margin:18px 0}
.msg.user .bubble{font-family:ui-serif,"New York","Tiempos Text",Georgia,"Times New Roman","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.55;background:var(--user);padding:9px 14px;border-radius:18px;max-width:85%;white-space:pre-wrap;overflow-wrap:anywhere}
.msg.ai{margin:18px 0;font-family:ui-serif,"New York","Tiempos Text",Georgia,"Times New Roman","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;font-size:17px;font-weight:400;line-height:1.65;min-width:0;overflow-wrap:anywhere}
.copy-msg{display:flex;gap:6px;margin:4px 0 0 -8px}
.copy-msg button{background:none;border:none;color:var(--muted);padding:8px;border-radius:8px;cursor:pointer;display:flex;opacity:.85}
.copy-msg button:active{background:var(--border)}
.msg.ai:not(:last-child) .act-regen{display:none}
.md>*:first-child{margin-top:0}.md p{margin:.6em 0}
.md pre{background:var(--code);padding:12px;border-radius:10px;overflow-x:auto;max-width:100%;font-size:13px;line-height:1.5;border:1px solid var(--border);overflow-wrap:normal}
.md code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.88em}
.md :not(pre)>code{background:var(--code);padding:1px 5px;border-radius:5px}
.md pre code.hljs{background:none;padding:0;white-space:pre}
.md table{border-collapse:collapse;display:block;overflow-x:auto;max-width:100%}
.md th,.md td{border:1px solid var(--border);padding:5px 10px}
.md blockquote{border-left:3px solid var(--accent);margin:.6em 0;padding-left:12px;color:var(--muted)}
.md a{color:var(--accent)}
.md img{max-width:100%;height:auto}
.svg-box{position:relative;background:none;border:none;padding:0;margin:1.2em 0;max-width:100%;overflow-x:auto}
.svg-view{text-align:center}
.svg-view svg{width:100%;max-width:none;height:auto;display:block}
.svg-box.pending{color:var(--muted);font:14px sans-serif;padding:28px;text-align:center}
.shimmer{background:linear-gradient(90deg,var(--muted) 30%,var(--fg) 50%,var(--muted) 70%);background-size:200% 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:shim 1.6s linear infinite}
@keyframes shim{from{background-position:200% 0}to{background-position:-200% 0}}
details.act{font:13px/1.5 -apple-system,"PingFang SC",sans-serif;color:var(--muted);margin:6px 0;padding:2px 0}
details.act summary{cursor:pointer;list-style:none;padding:4px 0}
details.act summary::-webkit-details-marker{display:none}
details.act .spin{display:inline-block;width:10px;height:10px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:sp .8s linear infinite;margin-right:6px;will-change:transform}
@keyframes sp{to{transform:rotate(360deg)}}
.src{display:flex;align-items:center;gap:8px;padding:4px 0 4px 8px;color:var(--fg);text-decoration:none;overflow:hidden}
.src img{width:16px;height:16px;border-radius:3px;flex-shrink:0}
.src .st{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}
.src .dm{color:var(--muted);font-size:12px;flex-shrink:0}
details.think pre{white-space:pre-wrap;margin:4px 0 0;padding-left:10px;border-left:2px solid var(--border);font:13px/1.6 -apple-system,"PingFang SC",sans-serif;max-height:240px;overflow:auto}
.err{color:#c0392b;border:1px solid #c0392b55;border-radius:10px;padding:8px 12px;margin:8px 0;font:14px sans-serif}
.composer-wrap{padding:0 12px calc(10px + env(safe-area-inset-bottom));flex-shrink:0}
.composer{max-width:720px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;background:var(--card);border:1px solid var(--border);border-radius:28px;padding:9px 9px 9px 20px;box-shadow:0 4px 18px #0000000f}
.note{max-width:720px;margin:0 auto 6px;padding:0 6px;font-size:13px;color:var(--muted);opacity:.85}
.composer:focus-within{border-color:#c9644299}
#input{flex:1;min-width:0;border:none;outline:none;resize:none;background:none;color:var(--fg);font-family:inherit;font-size:17px;line-height:1.5;max-height:200px;padding:6px 0;-webkit-appearance:none}
#sendBtn{width:38px;height:38px;border-radius:50%;border:none;background:var(--accent);color:#fff;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;padding:0}
#sendBtn.stop{font-size:13px}
body.kb .composer-wrap{padding-bottom:8px}
.hint{text-align:center;font-size:11px;color:var(--muted);margin-top:4px}
#scrim{display:none}
@media(max-width:760px){
 #sidebar{position:fixed;inset:0 auto 0 0;z-index:20;transform:translateX(-100%);transition:transform .22s ease;width:80%;max-width:300px;padding-top:calc(12px + env(safe-area-inset-top));padding-bottom:calc(12px + env(safe-area-inset-bottom))}
 body.drawer #sidebar{transform:none}
 #scrim{display:block;position:fixed;inset:0;background:#0006;z-index:10;opacity:0;pointer-events:none;transition:opacity .22s}
 body.drawer #scrim{opacity:1;pointer-events:auto}
 #sidebar.drag,#sidebar.drag~#scrim{transition:none!important}
 body.dragging #scrim{transition:none}
 .top{display:flex;justify-content:space-between;position:absolute;top:0;left:0;right:0;z-index:6;padding:calc(8px + env(safe-area-inset-top)) 14px 0;pointer-events:none}
 .top::before{content:"";position:absolute;left:0;right:0;top:0;height:calc(70px + env(safe-area-inset-top));background:linear-gradient(var(--bg) 35%,transparent);z-index:-1}
 #topTitle{display:none}
 .fab{pointer-events:auto;height:44px;min-width:44px;border-radius:22px;background:var(--card);border:1px solid var(--border);box-shadow:0 2px 10px #0000000d;color:var(--fg);display:flex;align-items:center;justify-content:center;padding:0;cursor:pointer}
 
 #chat{padding-top:calc(76px + env(safe-area-inset-top))}
 .hint{display:none}
}
.logo-big{width:84px;height:84px;border-radius:22px;display:block;margin:0 auto 14px;box-shadow:0 4px 16px #0000001f}
.logo-s{width:28px;height:28px;border-radius:8px;vertical-align:middle;margin-right:8px}
.msg.enter{animation:rise .28s cubic-bezier(.2,.8,.2,1) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.fi{animation:fi .22s ease-out both}
@keyframes fi{from{opacity:0}to{opacity:1}}
.blk>*:first-child{margin-top:0}.blk:not(:first-child)>*:first-child{margin-top:.6em}
.ph{font:14px sans-serif;color:var(--muted);padding:4px 0}
.msg.user.failed{flex-wrap:wrap;justify-content:flex-end}
.msg.user .bubble{font-family:ui-serif,"New York","Tiempos Text",Georgia,"Times New Roman","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.55;will-change:transform}
.retry{flex-basis:100%;text-align:right;background:none;border:none;color:#c0392b;font:13px sans-serif;padding:6px 4px 0;cursor:pointer}
details.grp>summary{display:flex;align-items:center;min-height:28px;line-height:28px}
details.grp .chev{display:inline-block;width:10px;margin-right:6px;transition:transform .15s}
details.grp[open] .chev{transform:rotate(90deg)}
details.grp .spin{flex-shrink:0}
details.grp>summary>span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.gb{padding:2px 0 6px 10px;border-left:2px solid var(--border);margin:2px 0 4px 3px}
.gt pre{white-space:pre-wrap;margin:4px 0;font:13px/1.6 -apple-system,"PingFang SC",sans-serif;max-height:240px;overflow:auto;color:var(--muted)}
.tl{margin:2px 0}.tl>summary{cursor:pointer;list-style:none;padding:3px 0}.tl>summary::-webkit-details-marker{display:none}
.ph{min-height:28px;line-height:28px;padding:0}
#toBottom{position:absolute;left:50%;transform:translateX(-50%);bottom:104px;z-index:5;background:var(--card);border:1px solid var(--border);color:var(--fg);border-radius:20px;font:13px sans-serif;padding:6px 14px;display:flex;align-items:center;gap:4px;box-shadow:0 2px 10px #0002;opacity:0;pointer-events:none;transition:opacity .2s}
#toBottom.show{opacity:1;pointer-events:auto}
main{position:relative}
.md table{border-collapse:collapse;display:block;overflow-x:auto;max-width:100%;font:13px/1.45 -apple-system,"PingFang SC",sans-serif;margin:.7em 0;-webkit-overflow-scrolling:touch}
.md th,.md td{border:1px solid var(--border);padding:4px 9px;white-space:nowrap}
.md th{background:var(--code);font-weight:600;text-align:left}
#scroll{overflow-anchor:auto}

/* v3.1 layout fixes */
.composer-wrap{position:absolute;left:0;right:0;bottom:0;z-index:4;padding-top:18px;background:linear-gradient(transparent,var(--bg) 18px)}
#scroll{padding-bottom:calc(var(--ch,96px) + 12px);scroll-padding-bottom:var(--ch,96px)}
.note{max-width:720px;margin:0 auto;padding:4px 16px 8px;font-size:12px;color:var(--muted);opacity:.8;text-align:left}
#chat:has(.empty)+.note{display:none}
#chat{padding-bottom:8px}
#toBottom{bottom:calc(var(--ch,96px) + 10px)}
@media (max-width:760px){#chat{padding-top:calc(60px + env(safe-area-inset-top))}}
#chat>.msg:first-child{margin-top:0}

/* v3.2 */
.composer{padding:5px 5px 5px 16px;border-radius:24px;gap:6px;align-items:flex-end}
#input{font-size:16px;line-height:1.45;padding:6px 0}
#sendBtn{width:32px;height:32px}
#sendBtn svg{width:18px;height:18px}
.composer-wrap{padding-top:14px}
#scroll:has(.empty){overflow:hidden}
body.kb .empty{margin-top:6vh}
body.kb .logo-big{width:56px;height:56px;border-radius:15px;margin-bottom:8px}
#toast{position:fixed;left:50%;top:calc(64px + env(safe-area-inset-top));transform:translate(-50%,-8px);background:#2b2a27e6;color:#fff;font:14px -apple-system,"PingFang SC",sans-serif;padding:8px 14px;border-radius:12px;opacity:0;pointer-events:none;transition:.2s;z-index:50;white-space:nowrap}
#toast.show{opacity:1;transform:translate(-50%,0)}
/* paragraph spacing a bit looser */
.md p{margin:.95em 0}
.md li{margin:.3em 0}
.blk:not(:first-child)>*:first-child{margin-top:.95em}

/* UX audit round */
.stopped{display:block;font:13px -apple-system,"PingFang SC",sans-serif;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:26px auto 0;max-width:460px;padding:0 8px}
.chip{font:15px -apple-system,"PingFang SC",sans-serif;color:var(--fg);background:var(--card);border:1px solid var(--border);border-radius:18px;padding:9px 14px;cursor:pointer}
.chip:active{background:var(--user)}
body.kb .chips{display:none}
@media(max-width:760px){.top::before{height:calc(64px + env(safe-area-inset-top));background:linear-gradient(var(--bg) 70%,transparent)}}
.conv .more{font-size:22px;padding:8px 14px;min-width:48px;min-height:44px}
.note{font-size:13px}

/* images */
.composer{flex-wrap:wrap;padding-left:6px}
#attachBtn{width:32px;height:32px;border-radius:50%;border:1px solid var(--border);background:none;color:var(--muted);flex-shrink:0;display:flex;align-items:center;justify-content:center;padding:0;cursor:pointer}
#attachBtn:active{background:var(--user)}
#input{padding-left:4px}
#tray{flex-basis:100%;display:none;gap:8px;overflow-x:auto;padding:8px 8px 4px 6px;-webkit-overflow-scrolling:touch}
#tray.has{display:flex}
.th{position:relative;width:64px;height:64px;flex-shrink:0;border-radius:12px;background:var(--code) center/cover no-repeat}
.th.load::after{content:"";position:absolute;left:50%;top:50%;width:20px;height:20px;margin:-10px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.th .x{position:absolute;right:-5px;top:-5px;width:22px;height:22px;border-radius:50%;border:none;background:#2b2a27;color:#fff;font:14px/22px sans-serif;padding:0;text-align:center;cursor:pointer}
.bubble.imgs{padding:4px;background:none}
.msg.user .bubble.hasimg{padding:5px;white-space:normal}
.mimgs{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;width:min(66vw,300px)}
.mimgs.one{display:block;width:auto}
.mimgs img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:12px;display:block;background:var(--code);cursor:pointer}
.mimgs.one img{width:auto;max-width:min(66vw,300px);max-height:320px;aspect-ratio:auto;object-fit:contain}
.bubble .mtxt{white-space:pre-wrap;padding:4px 9px 3px}
#viewer{position:fixed;inset:0;z-index:100;background:#000;display:none;touch-action:none}
#viewer.show{display:block}
#viewer .vs{position:absolute;inset:0;display:flex;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none}
#viewer .vs::-webkit-scrollbar{display:none}
#viewer .vs div{flex:0 0 100%;scroll-snap-align:center;display:flex;align-items:center;justify-content:center}
#viewer img{max-width:100%;max-height:100%;object-fit:contain}
#viewer .vc{position:absolute;top:calc(14px + env(safe-area-inset-top));right:14px;color:#fff;font:14px sans-serif;background:#0008;border-radius:14px;padding:4px 10px}
.th{box-shadow:inset 0 0 0 1px var(--border)}.mimgs img{outline:1px solid var(--border);outline-offset:-1px}
.th{box-shadow:inset 0 0 0 1px var(--border)}
#tray{padding-top:10px}
.mimgs img{box-shadow:inset 0 0 0 1px var(--border);border:1px solid var(--border)}

/* ---- public edition: login gate + incognito (additive) ---- */
#gate{display:none;position:fixed;inset:0;z-index:100;background:var(--bg);align-items:center;justify-content:center;text-align:center;padding:24px}
#gate .gate-t{font-size:18px;line-height:1.6}
#gate small{display:block;margin-top:10px;color:var(--muted);font-size:14px}
body.gated #gate{display:flex}
body.gated #app{display:none}
body.pending #app{visibility:hidden}
#topIncog,#incogTitle{display:none}
.fab.on{background:#2b2a27;color:#fff;border-color:#2b2a27;--eye:#2b2a27}
.fab:not(.on){--eye:var(--card)}
@media(prefers-color-scheme:dark){.fab.on{background:#ececea;color:#262624;border-color:#ececea;--eye:#ececea}.fab:not(.on){--eye:var(--card)}}
.empty.incog{margin-top:22vh}
.empty.incog svg{display:block;margin:0 auto 18px}
.empty.incog small{margin:0 auto;max-width:290px;font-size:15px;color:var(--fg)}
#incogSide{margin-top:8px;color:var(--fg)}
@media(max-width:760px){
  #incogSide{display:none}
  body.emptystate #topIncog{display:flex}
  body.emptystate #topNew{display:none}
  body.incog #incogTitle{display:block;position:absolute;left:0;right:0;top:calc(8px + env(safe-area-inset-top));line-height:44px;text-align:center;font-size:16px;pointer-events:none}
}
/* UI polish (build p) */
:root{--r:12px;--sh:0 2px 10px #0000000d;--sel:#e9e6dc;--danger:#d3392b;--sheet:#fffffffa;--sheetline:#0000001a}
@media(prefers-color-scheme:dark){:root{--sel:#33322e;--danger:#ff6b5e;--sheet:#2f2f2dfa;--sheetline:#ffffff1f;--border:#403f3a;--muted:#a3a198}}
button{transition:transform .12s ease,background-color .12s ease,opacity .12s ease}
.new-btn:active,.fab:active,#sendBtn:active,#attachBtn:active,.chip:active,#toBottom:active{transform:scale(.95);opacity:.8}
#sendBtn:active{transform:scale(.92)}
#sidebar{box-shadow:none}
@media(max-width:760px){#sidebar{border-right:none;box-shadow:6px 0 30px #00000026;border-radius:0 16px 16px 0}}
.side-head{padding:6px 8px 14px}
.new-btn{border-radius:var(--r);padding:11px;font-size:15px;box-shadow:var(--sh)}
.side-label{font-size:12px;font-weight:600;letter-spacing:.02em;color:var(--muted);margin:18px 10px 4px}
#convList .side-label:first-child{margin-top:8px}
.conv{border-radius:10px;margin:1px 0}
.conv:hover{background:none}
@media(hover:hover){.conv:hover{background:var(--sel)}}
.conv.active{background:var(--sel)}
.conv:active{background:var(--sel)}
.conv .t{font-size:15px;padding:11px 10px}
/* action sheet */
.sheet-wrap{position:fixed;inset:0;z-index:80;display:flex;align-items:flex-end;justify-content:center}
.sheet-bg{position:absolute;inset:0;background:#0000006b;opacity:0;transition:opacity .22s}
.sheet-wrap.show .sheet-bg{opacity:1}
.sheet{position:relative;width:100%;max-width:520px;padding:0 8px calc(8px + env(safe-area-inset-bottom));transform:translateY(110%);transition:transform .26s cubic-bezier(.2,.8,.2,1)}
.sheet-wrap.show .sheet{transform:none}
.sheet-grp{background:var(--sheet);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);border-radius:14px;margin-bottom:8px;overflow:hidden;color:var(--fg)}
.sheet-title{font-size:13px;color:var(--muted);text-align:center;padding:14px 16px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sheet-grp button{display:block;width:100%;background:none;border:none;border-top:1px solid var(--sheetline);color:#2f6fdb;font-size:17px;padding:16px;text-align:center;cursor:pointer}
@media(prefers-color-scheme:dark){.sheet-grp button{color:#6aa3ff}}
.sheet-grp button.danger{color:var(--danger)}
.sheet-grp button.bold{font-weight:600}
.sheet-grp button:active{background:var(--sheetline)}
.sheet-grp>button:first-child{border-top:none}
.sheet-in{display:block;width:calc(100% - 32px);margin:2px 16px 14px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--fg);font:17px -apple-system,"PingFang SC",sans-serif;padding:11px 12px;outline:none;-webkit-appearance:none}
.sheet-in:focus{border-color:#c9644299}
.sheet-row{display:flex}
.sheet-row button{flex:1}
.sheet-row button+button{border-left:1px solid var(--sheetline)}
/* toast (unified: bottom, above composer) */
#toast{top:auto;bottom:calc(var(--ch,96px) + 14px + env(safe-area-inset-bottom));transform:translate(-50%,8px);background:#2b2a27f0;box-shadow:0 4px 18px #0003;border-radius:14px;font-size:15px;padding:11px 16px;z-index:90;display:flex;align-items:center;gap:14px}
#toast.show{transform:translate(-50%,0)}
#toast.has-act{pointer-events:auto;padding-right:6px}
#toast button{background:none;border:none;color:#ffb089;font:600 15px -apple-system,"PingFang SC",sans-serif;padding:6px 12px;border-radius:10px;cursor:pointer}
#toast button:active{background:#ffffff22}
@media(prefers-color-scheme:dark){#toast{background:#4a4944f0}}
/* type scale + spacing */
.hint{font-size:12px}
details.act{font-size:14px}
.gt pre,details.think pre{font-size:14px}
.stopped,.retry,.note{font-size:13px}
.ph,.err,.svg-box.pending{font-size:15px}
details.grp>summary{margin-bottom:4px}
.gb{margin:4px 0 8px 3px}
.src .dm{font-size:13px}
/* code / table */
.md pre{border-radius:var(--r);padding:14px;font-size:13.5px;margin:.9em 0;box-shadow:var(--sh)}
.md table{font-size:14px;border:1px solid var(--border);border-radius:10px;border-collapse:separate;border-spacing:0;box-shadow:var(--sh)}
.md th,.md td{border:none;border-bottom:1px solid var(--border);border-right:1px solid var(--border);padding:8px 12px}
.md th:last-child,.md td:last-child{border-right:none}
.md tr:last-child td{border-bottom:none}
.md img{border-radius:var(--r)}
.md blockquote{border-left-width:3px;border-radius:2px}
/* images */
.mimgs{gap:3px}
.mimgs img,.th{border-radius:14px}
.mimgs.one img{border-radius:16px}
.msg.user .bubble{border-radius:20px}
.composer{box-shadow:0 4px 20px #0000001a;border-radius:26px}
#toBottom{box-shadow:var(--sh)}
.fab{box-shadow:var(--sh)}

/* ref-aligned: empty state, sidebar, composer */
.logo-big{width:40px;height:40px;border-radius:0;box-shadow:none;margin:0 auto 18px;background:none}
.empty{margin-top:0;position:absolute;left:0;right:0;top:36%;transform:translateY(-50%);padding:0 24px}
.empty .greet{font-size:28px;line-height:1.3;letter-spacing:-.01em}
body.kb .logo-big{width:40px;height:40px;border-radius:0;margin-bottom:14px}
body.kb .empty{margin-top:0;top:30%}
#chat{position:relative}
#chat:has(.empty){min-height:60vh}
@media(min-width:761px){#sidebar{position:relative}}
.side-head{padding:6px 10px 10px;display:flex;align-items:center}
.brand{font-size:26px;font-weight:600;letter-spacing:-.01em}
.logo-s{display:none}
#convList{padding-bottom:90px;margin:0 -4px;padding-left:4px;padding-right:4px}
.conv{padding-left:6px}
.conv::before{content:"";flex-shrink:0;width:20px;height:20px;margin-left:4px;background:var(--muted);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 20l1.3-4A8 8 0 1 1 8.5 19Z'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 20l1.3-4A8 8 0 1 1 8.5 19Z'/%3E%3C/svg%3E") center/contain no-repeat}
.conv .t{padding-left:8px}
.new-btn{position:absolute;left:50%;bottom:calc(16px + env(safe-area-inset-bottom));transform:translateX(-50%);background:#2b2a27;color:#fff;border:none;border-radius:26px;height:52px;padding:0 26px;font-size:17px;font-weight:500;box-shadow:0 6px 20px #0000003d;display:flex;align-items:center;gap:8px;white-space:nowrap;z-index:2}
.new-btn::before{content:"+";font-size:24px;font-weight:300;line-height:1;margin-top:-2px}
.new-btn:active{transform:translateX(-50%) scale(.95)}
@media(prefers-color-scheme:dark){.new-btn{background:#ececea;color:#1f1e1d}}
#sidebar::after{content:"";position:absolute;left:0;right:0;bottom:0;height:calc(96px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--side) 70%);pointer-events:none;z-index:1}
/* top-right button area: same-size round buttons can sit side by side */
.top{gap:8px}.top .fab{flex-shrink:0}
.fab.pill{padding:0;width:44px}
/* two-row composer while typing */
.composer:focus-within{border-radius:24px;padding:10px 8px 8px 16px;gap:0}
.composer:focus-within #tray{order:0}
.composer:focus-within #input{order:1;flex:1 0 100%;padding:2px 4px 8px 0;min-height:30px}
.composer:focus-within #attachBtn{order:2;width:36px;height:36px}
.composer:focus-within #sendBtn{order:3;margin-left:auto;width:36px;height:36px}
.composer:focus-within #sendBtn svg{width:20px;height:20px}
@media(max-width:760px){body:not(.drawer):not(.dragging) #sidebar{box-shadow:none}}
/* Latin in iOS "New York" serif (lining figures, like the Claude app); Chinese stays PingFang */
.msg.ai,.msg.user .bubble{font-variant-numeric:lining-nums;-webkit-font-smoothing:antialiased}
.md strong,.md b{font-weight:600}