*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{--bg:#f9f9f7;--fg:#242424;--sub:#8b8b83;--line:#e7e7e2;--card:#fff;--accent:#223c35;--on-accent:#fff;--bubble:#eaeae5;--soft:#e9edeb;--press:#eeeeea;--danger:#b3261e;
  --app-h:100dvh;--st:env(safe-area-inset-top);--sb:env(safe-area-inset-bottom);--sl:env(safe-area-inset-left);--sr:env(safe-area-inset-right)}
@media (prefers-color-scheme:dark){:root{--bg:#1b1c1b;--fg:#ececea;--sub:#9a9a93;--line:#30312f;--card:#262725;--accent:#7fb8a4;--on-accent:#10201b;--bubble:#2f302e;--soft:#2c3a35;--press:#2a2b29}}
/* 皮肤（ECHO 设计）；选了皮肤就不再跟随系统深浅色 */
:root[data-skin=peach]{--bg:#FFF8F1;--card:#FFFFFF;--bubble:#F6DFC9;--accent:#9B4F28;--on-accent:#FFFDFC;--fg:#352B27;--sub:#756055;--line:#e5ddd7;--soft:#f3eae5;--press:#f1eae3;--danger:#b3261e;color-scheme:light}
:root[data-skin=sakura]{--bg:#FFF5F7;--card:#FFFCFD;--bubble:#F8DCE5;--accent:#A03D61;--on-accent:#FFFFFF;--fg:#3F2932;--sub:#795864;--line:#e6dadd;--soft:#f4e5ea;--press:#f2e7e9;--danger:#b3261e;color-scheme:light}
:root[data-skin=lavender]{--bg:#F7F4FC;--card:#FDFCFF;--bubble:#E8DFF6;--accent:#7450A1;--on-accent:#FFFFFF;--fg:#332B40;--sub:#70617F;--line:#dedae4;--soft:#ede7f4;--press:#e9e6ef;--danger:#b3261e;color-scheme:light}
:root[data-skin=mint]{--bg:#F1F8F3;--card:#FCFFFD;--bubble:#D8EDDF;--accent:#326C53;--on-accent:#FFFFFF;--fg:#243C30;--sub:#567161;--line:#d6e0da;--soft:#e4ede9;--press:#e3ebe5;--danger:#b3261e;color-scheme:light}
:root[data-skin=sky]{--bg:#F2F7FC;--card:#FFFFFF;--bubble:#DAEAF9;--accent:#2D6392;--on-accent:#FFFFFF;--fg:#263748;--sub:#586D82;--line:#d7dee5;--soft:#e6ecf2;--press:#e4eaef;--danger:#b3261e;color-scheme:light}
:root[data-skin=night]{--bg:#181C2B;--card:#23283B;--bubble:#353451;--accent:#BEB0F1;--on-accent:#211D30;--fg:#F1EDF9;--sub:#B4AFC4;--line:#343746;--soft:#363851;--press:#272b39;--danger:#ff8f86;color-scheme:dark}
/* 按钮按下、焦点 */
button,.pill{transition:transform .15s ease,background-color .15s ease}
button:not(:disabled):active,.pill:active{transform:scale(.97)}
@media (prefers-reduced-motion:reduce){button,.pill{transition:none}button:not(:disabled):active,.pill:active{transform:none}}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--fg);
  font:16px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Noto Sans SC",sans-serif;-webkit-text-size-adjust:100%}
body{position:fixed;inset:0}
/* 整页不缩放：禁双击放大；输入框字号不小于 16px，iOS 点输入框不会自动放大（看图层自己处理缩放） */
html,body{touch-action:pan-x pan-y}
input,textarea,select{font-size:max(16px,1em)}
#app{position:fixed;left:0;right:0;top:0;height:var(--app-h);overflow:hidden}
button{font:inherit;border:0;background:transparent;color:inherit;padding:0;cursor:pointer}
svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
[hidden]{display:none!important}
input,textarea{font:inherit;color:inherit}

/* 登录 */
#login{height:100%;overflow-y:auto;display:grid;place-items:center;padding:24px calc(24px + var(--sr)) calc(24px + var(--sb)) calc(24px + var(--sl))}
.login-box{width:100%;max-width:340px;text-align:center}
.login-robot{display:block;width:96px;height:96px;border-radius:26px;margin:auto;box-shadow:0 10px 24px -10px var(--glow,rgba(0,0,0,.35))}
.login-box h1{font-size:24px;margin:18px 0 4px}
.login-box p{color:var(--sub);margin:0 0 24px}
.login-box input{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--card);font-size:17px;outline:none}
.login-box input:focus{border-color:var(--accent)}
.primary{width:100%;margin-top:12px;padding:14px;border-radius:14px;background:var(--accent);color:var(--on-accent);font-weight:600;font-size:17px;min-height:48px}
.err{color:var(--danger);min-height:24px;margin-top:10px;font-size:14px}
.logo{width:56px;height:56px;border-radius:18px;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;font-weight:700;margin:auto;letter-spacing:1px}
.logo.big{width:52px;height:52px}

/* 主界面 */
#main,.page{height:100%;display:flex;flex-direction:column}
.top{flex:none;display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:calc(6px + var(--st)) calc(8px + var(--sr)) 6px calc(8px + var(--sl));border-bottom:1px solid var(--line);background:var(--bg)}
.icon{width:44px;height:44px;display:grid;place-items:center;border-radius:12px}
.icon:active{background:var(--press)}
.icon.small{width:40px;height:40px;border-radius:50%;background:var(--soft);color:var(--accent)}
.icon.small:active{background:var(--bubble)}
.model{display:flex;align-items:center;gap:2px;font-weight:600;font-size:16px;padding:8px 10px;border-radius:12px;max-width:72vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.model svg{width:18px;height:18px;color:var(--sub);flex:none}
button.model:active{background:var(--press)}
#chat{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:16px calc(16px + var(--sr)) 24px calc(16px + var(--sl))}
.empty{text-align:center;color:var(--sub);padding-top:18vh}
.empty h2{color:var(--fg);font-size:22px;margin:16px 0 6px}
.empty p{margin:0 24px;font-size:15px}
#msgs{max-width:760px;margin:0 auto;font-size:var(--chat-fs,17px)}
.msg{margin:0 0 22px}
.msg.user{display:flex;flex-direction:column;align-items:flex-end}
.msg.user .bubble{max-width:85%;background:var(--bubble);color:var(--fg);padding:10px 15px;border-radius:20px 20px 6px 20px;white-space:pre-wrap;word-break:break-word}
.msg.user .tag{font-size:12px;color:var(--sub);margin-bottom:4px}
.msg.user .tag .ic{width:22px;height:22px}
.msg.ai .who .who-ic{width:24px;height:24px}
.thumbs{display:flex;flex-wrap:wrap;gap:6px;justify-content:flex-end;margin-bottom:6px}
.thumbs img{width:96px;height:96px;object-fit:cover;border-radius:12px;background:var(--bubble)}
.msg.ai .who{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--sub);margin-bottom:6px}
.avatar{width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--on-accent);display:inline-grid;place-items:center;font-size:11px;font-weight:600;flex:none}
.avatar.m-claude{background:#d97757;color:#fff}
.avatar.m-gpt{background:#0d0d0d;color:#fff}
@media (prefers-color-scheme:dark){:root:not([data-skin]) .avatar.m-gpt{background:#fff;color:#0d0d0d}}
:root[data-skin=night] .avatar.m-gpt{background:#fff;color:#0d0d0d}
.avatar svg{width:18px;height:18px}
.avatar.m-gpt svg{width:17px;height:17px}
.fs-row{display:flex;gap:8px;margin:4px 0 12px}
.fs-row button{flex:1;min-height:44px;padding:8px 0;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.fs-row button.on{border-color:var(--accent);background:var(--soft);color:var(--accent);font-weight:700}
.fs-demo{padding:12px 14px;border-radius:12px;background:var(--bubble);line-height:1.75}
.answer{word-break:break-word;line-height:1.75}
.answer p{margin:0 0 .8em}
.answer>*:last-child{margin-bottom:0}
.answer h1,.answer h2,.answer h3,.answer h4{font-size:1.06em;margin:1.1em 0 .5em}
.answer ul,.answer ol{padding-left:1.4em;margin:0 0 .8em}
.answer li{margin:.2em 0}
.answer code{font:14px ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--bubble);padding:1px 5px;border-radius:5px}
.answer pre{background:#1f2321;color:#e8ece9;border-radius:12px;padding:0;margin:0 0 .9em;overflow:hidden}
.answer pre .code-head{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#9aa;padding:6px 12px;background:#2a2f2c}
.answer pre .code-head button{color:#cde;font-size:12px}
.answer pre code{display:block;background:none;padding:10px 12px;overflow-x:auto;color:inherit;font-size:.8em;line-height:1.55;white-space:pre}
.answer blockquote{margin:0 0 .8em;padding-left:12px;border-left:3px solid var(--line);color:var(--sub)}
.answer table{border-collapse:collapse;display:block;overflow-x:auto;margin:0 0 .9em;font-size:.88em}
.answer th,.answer td{border:1px solid var(--line);padding:5px 9px;text-align:left}
.answer a{color:var(--accent)}
.answer hr{border:0;border-top:1px solid var(--line)}
.gen{display:grid;gap:8px;margin-top:4px}
.gen img{width:100%;max-width:520px;border-radius:14px;background:var(--bubble);display:block}
.typing{display:inline-flex;gap:5px;padding:8px 0}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--sub);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
.status{font-size:13px;color:var(--sub);margin-top:4px}
.status.error{color:var(--danger)}
.actions{display:flex;gap:4px;margin-top:8px;margin-left:-8px}
.actions button{display:inline-flex;align-items:center;gap:4px;font-size:13px;color:var(--sub);padding:6px 8px;border-radius:10px}
.actions button svg{width:16px;height:16px}
.actions button:active{background:var(--press)}
.cursor::after{content:"▍";color:var(--sub);animation:blink 1s infinite}
.to-bottom{position:absolute;right:calc(16px + var(--sr));bottom:calc(var(--composer-h,150px) + 10px);width:38px;height:38px;border-radius:50%;
  background:var(--card);border:1px solid var(--line);display:grid;place-items:center;box-shadow:0 2px 10px #0002;z-index:5}
.to-bottom svg{width:18px;height:18px}

/* 输入区 */
.composer{flex:none;padding:8px calc(12px + var(--sr)) calc(8px + var(--sb)) calc(12px + var(--sl));background:var(--bg)}
.kb .composer{padding-bottom:8px}
.modes{display:flex;gap:8px;margin-bottom:8px}
.chip{padding:6px 14px;font-size:13px;border:1px solid var(--line);border-radius:20px;background:var(--card)}
.chip.active{background:var(--soft);color:var(--accent);border-color:var(--accent);font-weight:600}
.box{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:0 2px 14px rgba(40,30,60,.06);padding:10px 10px 8px 14px;max-width:760px;margin:0 auto}
#input{width:100%;border:0;outline:none;background:transparent;resize:none;font-size:16px;line-height:1.5;max-height:35vh;padding:2px 0;display:block}
#input::placeholder{color:var(--sub)}
.tools{display:flex;align-items:center;justify-content:space-between;margin-top:6px;gap:8px}
.mode-hint{flex:1;font-size:12px;color:var(--sub);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.send{width:44px;height:44px;border-radius:50%;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;flex:none;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.send:disabled{background:var(--line);color:var(--sub);box-shadow:none;cursor:default}
.send svg{width:20px;height:20px}
.send.stop svg{fill:currentColor;stroke:none}
.attach-list{display:flex;gap:8px;overflow-x:auto;margin-bottom:8px}
.attach-list:empty{display:none}
.att{position:relative;flex:none}
.att img{width:60px;height:60px;object-fit:cover;border-radius:10px;display:block}
.att .x{position:absolute;top:-6px;right:-6px;width:22px;height:22px;border-radius:50%;background:#000a;color:#fff;font-size:14px;line-height:22px;text-align:center}
.att.loading img{opacity:.4}

/* 侧栏 */
.mask{position:fixed;inset:0;background:#0006;z-index:20;animation:fade .2s}
@keyframes fade{from{opacity:0}}
#drawer{position:fixed;top:0;bottom:0;left:0;width:min(84vw,330px);background:var(--bg);z-index:21;display:flex;flex-direction:column;
  transform:translateX(-102%);transition:transform .22s ease;padding:var(--st) 0 var(--sb) var(--sl)}
#drawer.open{transform:none}
.drawer-head{padding:12px 14px 6px}
.pill{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:9px 18px;border:1px solid var(--line);border-radius:22px;background:var(--card);font-size:15px;text-decoration:none;color:inherit}
.pill svg{width:18px;height:18px}
.pill:active{background:var(--press)}
.pill:disabled{background:var(--line);color:var(--sub);border-color:var(--line)}
.pill.danger{color:var(--danger)}
.primary-pill{background:var(--accent);border-color:var(--accent);color:var(--on-accent);font-weight:600}
.primary-pill:active{background:var(--accent);opacity:.9}
.drawer-head .pill{width:100%;background:var(--soft);border-color:transparent;color:var(--accent);font-weight:600}
.drawer-search{padding:6px 14px}
.drawer-search input{width:100%;padding:9px 12px;border-radius:12px;border:1px solid var(--line);background:var(--card);outline:none;font-size:16px}
.topic-list{flex:1;overflow-y:auto;padding:4px 8px;-webkit-overflow-scrolling:touch}
.group{font-size:12px;color:var(--sub);padding:12px 10px 4px}
.topic{display:flex;align-items:center;border-radius:12px}
.topic.active{background:var(--soft)}
.topic.active .t{color:var(--accent);font-weight:600}
.topic .t{flex:1;padding:11px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:15px;text-align:left}
.topic .pin{display:inline-block;vertical-align:-2px;margin-right:5px;color:var(--accent)}
.topic .pin .ic{display:inline-block;width:16px;height:16px;vertical-align:-3px}
.topic .more{width:40px;height:40px;display:grid;place-items:center;color:var(--sub)}
.drawer-foot{border-top:1px solid var(--line);padding:8px 12px}
.row-btn{display:flex;align-items:center;gap:10px;width:100%;padding:11px 6px;font-size:15px;border-radius:10px}
.row-btn:active{background:var(--press)}
.me{display:flex;align-items:center;gap:10px;padding:8px 6px}
.me #meName{flex:1;font-weight:600}
.link{color:var(--sub);font-size:14px;padding:6px}
.no-topic{color:var(--sub);font-size:14px;padding:20px 10px;text-align:center}

/* 底部弹层 */
.sheet{position:fixed;left:0;right:0;bottom:var(--kb,0px);z-index:31;background:var(--card);border-radius:20px 20px 0 0;
  padding:8px calc(12px + var(--sr)) calc(12px + var(--sb)) calc(12px + var(--sl));max-height:calc(var(--app-h) - var(--st) - 16px);
  overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;animation:up .22s ease}
.kb .sheet{padding-bottom:12px}
.kb .page-body{padding-bottom:20px}
.top .side{display:flex;min-width:88px}
.top .side.right{justify-content:flex-end}
#notesText{width:100%;min-height:50vh;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--card);outline:none;font-size:16px;line-height:1.6;resize:vertical}
.kb #notesText{min-height:0;max-height:calc(var(--app-h) * .45)}
#notesPage .mem-actions{align-items:center;justify-content:space-between}
#notesPage .mem-actions .note-text{margin:0}
.kb #impText{max-height:calc(var(--app-h) * .45)}
.kb #toast{bottom:calc(var(--kb,0px) + 90px)}
#sheetMask{z-index:30}
@keyframes up{from{transform:translateY(100%)}}
.sheet .grab{width:38px;height:5px;border-radius:3px;background:var(--line);margin:2px auto 10px}
.sheet h3{font-size:15px;margin:4px 6px 8px;color:var(--sub);font-weight:500}
.opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:12px 10px;border-radius:12px}
.opt:active{background:var(--press)}
.opt .n{font-weight:600}
.opt .d{font-size:13px;color:var(--sub)}
.opt .ck{margin-left:auto;color:var(--accent);font-weight:700}
.opt.danger{color:var(--danger)}
.sheet input[type=text],.sheet textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);outline:none;font-size:16px}
.sheet textarea{resize:vertical;min-height:90px}
.sheet .btns{display:flex;gap:10px;margin-top:12px}
.sheet .btns .pill{flex:1}

/* 记忆 */
.page{position:fixed;left:0;right:0;top:0;height:var(--app-h);background:var(--bg);z-index:25}
.page-body{flex:1;overflow-y:auto;padding:12px calc(16px + var(--sr)) calc(20px + var(--sb)) calc(16px + var(--sl));-webkit-overflow-scrolling:touch}
.note-text{color:var(--sub);font-size:14px;margin:0 0 12px}
.mem-actions{display:flex;gap:10px;margin:10px 0 14px;flex-wrap:wrap}
.mem-actions.sticky{position:sticky;bottom:0;background:var(--bg);padding:10px 0;margin:0}
.mem{display:flex;gap:8px;align-items:flex-start;padding:12px 4px;border-bottom:1px solid var(--line)}
.mem .mt{flex:1;word-break:break-word;font-size:15px}
.mem .src{display:block;font-size:12px;color:var(--sub);margin-top:2px}
.mem .more{width:36px;height:30px;display:grid;place-items:center;color:var(--sub);flex:none}
#impText{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--card);outline:none;font-size:16px;resize:vertical}
.imp{display:flex;gap:10px;align-items:flex-start;padding:10px 2px;border-bottom:1px solid var(--line);font-size:15px}
.imp input{width:20px;height:20px;margin-top:3px;accent-color:var(--accent);flex:none}
.imp span{flex:1;word-break:break-word;outline:none}

/* 看图 */
#viewer{position:fixed;left:0;right:0;top:0;height:var(--app-h,100dvh);z-index:50;display:flex;flex-direction:column;touch-action:none;color:var(--fg);
  background:radial-gradient(120% 70% at 50% 0%,color-mix(in srgb,var(--accent) 16%,transparent),transparent 70%),var(--bg)}
.viewer-stage{flex:1;overflow:hidden;display:grid;place-items:center;position:relative;z-index:0}
#viewerImg{max-width:100%;max-height:100%;transform-origin:center;will-change:transform;user-select:none;-webkit-user-select:none;-webkit-touch-callout:default;border-radius:6px;box-shadow:0 6px 30px #0003}
.viewer-bar{position:absolute;left:0;right:0;top:0;z-index:2;display:flex;justify-content:space-between;align-items:center;gap:8px;touch-action:manipulation;
  padding:calc(8px + var(--st)) calc(12px + var(--sr)) 8px calc(12px + var(--sl));font-size:14px;color:var(--sub);
  background:linear-gradient(180deg,color-mix(in srgb,var(--bg) 92%,transparent),color-mix(in srgb,var(--bg) 0%,transparent))}
.vbtn{display:inline-flex;align-items:center;gap:6px;min-height:44px;min-width:44px;padding:0 16px 0 12px;border-radius:22px;font-size:15px;font-weight:600;
  color:var(--fg);background:var(--ic-bg);border:1px solid var(--line);box-shadow:0 2px 10px #0001;touch-action:manipulation;cursor:pointer}
.vbtn .ic{width:22px;height:22px}
.vbtn:active{background:var(--press)}
#viewerTip{position:absolute;left:0;right:0;bottom:0;z-index:2;text-align:center;font-size:13px;color:var(--sub);pointer-events:none;padding:8px 16px calc(10px + var(--sb))}
#viewerTip:empty{display:none}
.pill.dark{background:#ffffff1a;border-color:#ffffff33;color:#fff}

#toast{position:fixed;left:50%;bottom:calc(120px + var(--sb));transform:translateX(-50%);background:#000c;color:#fff;padding:9px 16px;border-radius:20px;font-size:14px;z-index:60;max-width:86vw;text-align:center}

/* 设置：皮肤 */
.skin-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:4px 0 16px}
.skin{display:flex;flex-direction:column;gap:6px;padding:6px 6px 8px;border-radius:16px;border:1.5px solid var(--line);background:var(--card);text-align:center;font-size:13px;color:var(--fg)}
.skin.on{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.skin.on .sn::after{content:" ✓";color:var(--accent);font-weight:700}
.skin .sv{position:relative;height:66px;border-radius:11px;overflow:hidden;border:1px solid rgba(0,0,0,.06)}
.skin .sv i{position:absolute;display:block}
.skin .sv .b1{right:8px;top:9px;width:46%;height:14px;border-radius:8px}
.skin .sv .t1{left:8px;top:30px;width:60%;height:5px;border-radius:3px;opacity:.7}
.skin .sv .t2{left:8px;top:40px;width:42%;height:5px;border-radius:3px;opacity:.4}
.skin .sv .sd{right:7px;bottom:6px;width:16px;height:16px;border-radius:50%}

/* 模型名前的公司标志 */
.brand{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;flex:none}
.brand svg{width:16px;height:16px}
.brand.m-claude{background:#d97757;color:#fff}
.brand.m-gpt{background:#0d0d0d;color:#fff}
@media (prefers-color-scheme:dark){:root:not([data-skin]) .brand.m-gpt{background:#fff;color:#0d0d0d}}
:root[data-skin=night] .brand.m-gpt{background:#fff;color:#0d0d0d}
#modelName{display:inline-flex;align-items:center;gap:6px;min-width:0}
#modelName .brand{width:20px;height:20px}
#modelName .brand svg{width:13px;height:13px;color:inherit}
#modelName .mn{overflow:hidden;text-overflow:ellipsis}

/* ---------- 皮肤加料：渐变背景、渐变气泡和按钮、点缀（老洪嫌太素） ---------- */
:root[data-skin=milktea]{--bg:#F7F1EA;--card:#FFFDF9;--bubble:#E9DCCB;--accent:#7B5A43;--on-accent:#FFFFFF;--fg:#3A2E26;--sub:#76675A;--line:#ded8d1;--soft:#efe9e3;--press:#eae3dc;--danger:#b3261e;color-scheme:light}
:root[data-skin=candy]{--bg:#FBF7FF;--card:#FFFFFF;--bubble:#F1DDF3;--accent:#9A4FA8;--on-accent:#FFFFFF;--fg:#362B44;--sub:#6F6380;--line:#e1dce7;--soft:#f3eaf5;--press:#ede9f2;--danger:#b3261e;color-scheme:light}
:root[data-skin=peach]{--bg-img:radial-gradient(60% 40% at 100% 0%,#FFDDC4 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#FFE0D6 0,transparent 70%),linear-gradient(180deg,#FFF9F3,#FFF3E8);
  --glass:rgba(255,248,241,.72);--bubble-img:linear-gradient(135deg,#FAE6D2,#F3CDB5);--accent-img:linear-gradient(135deg,#C8733F,#9B4F28);--glow:rgba(155,79,40,.30);--deco:"🍑"}
:root[data-skin=sakura]{--bg-img:radial-gradient(60% 40% at 100% 0%,#FFD3E1 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#FCE1F0 0,transparent 70%),linear-gradient(180deg,#FFF7F9,#FFEFF4);
  --glass:rgba(255,245,247,.72);--bubble-img:linear-gradient(135deg,#FDE3EC,#F6C5D6);--accent-img:linear-gradient(135deg,#DE6E96,#A03D61);--glow:rgba(160,61,97,.32);--deco:"🌸"}
:root[data-skin=lavender]{--bg-img:radial-gradient(60% 40% at 100% 0%,#E4D6FA 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#F7DCEF 0,transparent 70%),linear-gradient(180deg,#F9F6FD,#F2ECFB);
  --glass:rgba(247,244,252,.72);--bubble-img:linear-gradient(135deg,#EFE6FB,#DACBF3);--accent-img:linear-gradient(135deg,#A383D6,#7450A1);--glow:rgba(116,80,161,.32);--deco:"💜"}
:root[data-skin=mint]{--bg-img:radial-gradient(60% 40% at 100% 0%,#CFEFDB 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#E8F5D5 0,transparent 70%),linear-gradient(180deg,#F4FAF5,#EAF5EE);
  --glass:rgba(241,248,243,.72);--bubble-img:linear-gradient(135deg,#E0F3E7,#C4E5D0);--accent-img:linear-gradient(135deg,#55A07C,#326C53);--glow:rgba(50,108,83,.30);--deco:"🌿"}
:root[data-skin=sky]{--bg-img:radial-gradient(60% 40% at 100% 0%,#D1E6FB 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#DDF3FB 0,transparent 70%),linear-gradient(180deg,#F5F9FD,#EAF2FB);
  --glass:rgba(242,247,252,.72);--bubble-img:linear-gradient(135deg,#E3F0FC,#C7DDF5);--accent-img:linear-gradient(135deg,#5294CC,#2D6392);--glow:rgba(45,99,146,.30);--deco:"☁️"}
:root[data-skin=night]{--bg-img:radial-gradient(1.2px 1.2px at 12% 18%,#fff9 50%,transparent 51%),radial-gradient(1px 1px at 72% 9%,#fff8 50%,transparent 51%),radial-gradient(1.4px 1.4px at 88% 31%,#fffa 50%,transparent 51%),radial-gradient(1px 1px at 35% 6%,#fff7 50%,transparent 51%),radial-gradient(1px 1px at 55% 24%,#fff6 50%,transparent 51%),radial-gradient(60% 40% at 100% 0%,#3a3270 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#2a2a5a 0,transparent 70%),linear-gradient(180deg,#1C2036,#141726);
  --glass:rgba(24,28,43,.70);--bubble-img:linear-gradient(135deg,#46427A,#33325A);--accent-img:linear-gradient(135deg,#DCD3FF,#A898EC);--glow:rgba(190,176,241,.35);--deco:"🌙"}
:root[data-skin=milktea]{--bg-img:radial-gradient(60% 40% at 100% 0%,#EFDCC6 0,transparent 70%),radial-gradient(55% 35% at 0% 100%,#F3E3D3 0,transparent 70%),linear-gradient(180deg,#F9F4EE,#F2EADF);
  --glass:rgba(247,241,234,.72);--bubble-img:linear-gradient(135deg,#EEE2D2,#DEC9B1);--accent-img:linear-gradient(135deg,#A57B5C,#7B5A43);--glow:rgba(123,90,67,.30);--deco:"🧋"}
:root[data-skin=candy]{--bg-img:radial-gradient(60% 40% at 100% 0%,#FFD6EC 0,transparent 70%),radial-gradient(55% 40% at 0% 100%,#D6E4FF 0,transparent 70%),radial-gradient(40% 30% at 0% 30%,#EBDDFF 0,transparent 70%),linear-gradient(180deg,#FDF8FF,#F6F0FF);
  --glass:rgba(251,247,255,.72);--bubble-img:linear-gradient(135deg,#FCDDEE,#DCD3FA);--accent-img:linear-gradient(135deg,#E46FA5,#8E63D8);--glow:rgba(160,90,190,.32);--deco:"🦄"}

:root[data-skin] #app,:root[data-skin] .page,:root[data-skin] #drawer{background:var(--bg-img,var(--bg))}
:root[data-skin] .top,:root[data-skin] .composer,:root[data-skin] .mem-actions.sticky{background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
:root[data-skin] .top{border-bottom-color:transparent;box-shadow:0 1px 0 var(--line)}
:root[data-skin] .composer{background:transparent;-webkit-backdrop-filter:none;backdrop-filter:none}
:root[data-skin] .msg.user .bubble{background:var(--bubble-img,var(--bubble));box-shadow:0 3px 12px var(--glow);box-shadow:0 4px 14px -6px var(--glow)}
:root[data-skin] .send:not(:disabled),:root[data-skin] .primary,:root[data-skin] .primary-pill,:root[data-skin] .logo,:root[data-skin] #meAvatar{background:var(--accent-img,var(--accent));border-color:transparent;box-shadow:0 6px 16px -6px var(--glow)}
:root[data-skin] .box{border-color:color-mix(in srgb,var(--accent) 22%,var(--line));box-shadow:0 8px 26px -12px var(--glow)}
:root[data-skin] .box:focus-within{border-color:color-mix(in srgb,var(--accent) 55%,var(--line))}
:root[data-skin] .icon.small{background:color-mix(in srgb,var(--accent) 12%,var(--card))}
:root[data-skin] .sheet{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 7%,var(--card)),var(--card) 140px)}
:root[data-skin] .drawer-head .pill{background:var(--accent-img);color:var(--on-accent);box-shadow:0 6px 16px -6px var(--glow)}
:root[data-skin] .topic.active{background:color-mix(in srgb,var(--accent) 13%,transparent)}
:root[data-skin] .chip.active,:root[data-skin] .fs-row button.on{background:color-mix(in srgb,var(--accent) 13%,var(--card))}
:root[data-skin] button.model{background:color-mix(in srgb,var(--card) 65%,transparent);border:1px solid var(--line);border-radius:20px;padding:6px 12px}
/* 点缀：空白页大图标、侧栏顶部、聊天区右上角淡淡一个 */
:root[data-skin] #main{position:relative}
:root[data-skin] #main::after{content:var(--deco);position:absolute;right:calc(14px + var(--sr));top:calc(64px + var(--st));font-size:54px;opacity:.13;pointer-events:none;transform:rotate(12deg)}
:root[data-skin] .drawer-head::before{content:var(--deco) " 我的话题";display:block;font-size:14px;color:var(--sub);margin:2px 4px 10px}
:root[data-skin] .skin .sv{background-size:cover}
.skin .sv .dc{position:absolute;left:6px;bottom:3px;font-size:15px;line-height:1}
:root[data-skin] #chat{position:relative;z-index:1}
:root[data-skin] #main::after{z-index:0}
:root[data-skin] .top,:root[data-skin] .composer{position:relative;z-index:2}

/* 欢迎页：小机器人 + 柔光 + 皮肤点缀角标 */
.hero{position:relative;width:96px;height:96px;margin:0 auto}
.hero::before{content:"";position:absolute;inset:-46px;border-radius:50%;background:radial-gradient(closest-side,color-mix(in srgb,var(--accent) 26%,transparent),transparent);pointer-events:none}
.hero .robot{position:relative;width:96px;height:96px;border-radius:26px;display:block;box-shadow:0 10px 26px -10px var(--glow,rgba(0,0,0,.25))}
:root[data-skin] .hero::after{content:var(--deco);position:absolute;right:-12px;bottom:-8px;font-size:30px;transform:rotate(10deg)}
/* 顶栏淡淡的同色渐变 */
:root[data-skin] .top{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 12%,var(--glass)),var(--glass))}
/* 用户气泡多一层：高光描边 */
:root[data-skin] .msg.user .bubble{border:1px solid color-mix(in srgb,#fff 55%,transparent);background-clip:padding-box}
:root[data-skin=night] .msg.user .bubble{border-color:rgba(255,255,255,.12)}
/* 皮肤卡片纹样 */
.skin .sv .pt{position:absolute;line-height:1;opacity:.6;pointer-events:none}

/* 新版本提醒：顶部居中的小条，不挡输入框 */
#updBar{position:fixed;top:calc(var(--st) + 10px);left:50%;transform:translateX(-50%);z-index:70;display:flex;align-items:center;gap:10px;
  padding:6px 6px 6px 16px;border-radius:24px;background:var(--card);color:var(--fg);border:1px solid var(--line);box-shadow:0 6px 24px #0003;font-size:15px;white-space:nowrap;max-width:92vw}
#updBar[hidden]{display:none}
#updBar #btnUpd{border:0;border-radius:18px;padding:0 16px;min-height:36px;background:var(--accent);color:var(--on-accent);font-size:15px;font-weight:600}
#updBar #btnUpdX{border:0;background:none;color:var(--sub);font-size:22px;line-height:1;min-width:36px;min-height:36px;border-radius:18px}

/* ---------- 画出来的图标（ECHO 画的粉紫珐琅图集，老洪要求不用系统字体/线条图标） ---------- */
:root{--ic-f:saturate(.8);--ic-bg:color-mix(in srgb,var(--accent) 10%,var(--card))}
@media (prefers-color-scheme:dark){:root:not([data-skin]){--ic-f:saturate(.8) brightness(1.12) drop-shadow(0 0 1px rgba(255,255,255,.55))}}
:root[data-skin=peach]{--ic-f:hue-rotate(28deg) saturate(1.05);--ic-bg:#FCE7D6}
:root[data-skin=sakura]{--ic-f:saturate(1);--ic-bg:#FDE3EC}
:root[data-skin=lavender]{--ic-f:hue-rotate(-18deg);--ic-bg:#EEE5FB}
:root[data-skin=mint]{--ic-f:hue-rotate(-125deg) saturate(.85);--ic-bg:#DDF1E4}
:root[data-skin=sky]{--ic-f:hue-rotate(-110deg);--ic-bg:#DDEBFA}
:root[data-skin=night]{--ic-f:brightness(1.12) drop-shadow(0 0 1.5px rgba(255,255,255,.6));--ic-bg:#363558}
:root[data-skin=milktea]{--ic-f:sepia(.55) saturate(.8) hue-rotate(-8deg);--ic-bg:#F3EADF}
:root[data-skin=candy]{--ic-f:saturate(1.15);--ic-bg:linear-gradient(135deg,#FCE0F0,#DDE6FD)}
.ic{display:block;width:24px;height:24px;object-fit:contain;filter:var(--ic-f);pointer-events:none;-webkit-user-drag:none;user-select:none;-webkit-user-select:none;flex:none}
.top .icon{width:44px;height:44px}
.top .icon .ic{width:28px;height:28px}
:root[data-skin] .top .icon:not(span){background:var(--ic-bg);border-radius:15px;width:42px;height:42px;box-shadow:inset 0 1px 0 rgba(255,255,255,.6),0 3px 10px -6px var(--glow)}
:root[data-skin=night] .top .icon:not(span){box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}
.icon.small{background:var(--ic-bg)}
:root[data-skin] .icon.small{background:var(--ic-bg);box-shadow:inset 0 1px 0 rgba(255,255,255,.6)}
.icon.small .ic{width:26px;height:26px}
/* 发送：浅色底 + 画的箭头；没字时变淡 */
.send,:root[data-skin] .send:not(:disabled){background:var(--ic-bg);border:1.5px solid color-mix(in srgb,var(--accent) 28%,transparent);box-shadow:0 4px 12px -6px var(--glow,rgba(0,0,0,.25))}
.send .ic{width:28px;height:28px}
.send.stop .ic{width:22px;height:22px}
.send:disabled{background:var(--ic-bg);border-color:transparent}
.send:disabled .ic{opacity:.4;filter:var(--ic-f) grayscale(.6)}
.actions button .ic{width:18px;height:18px}
.to-bottom{background:var(--ic-bg)}
.to-bottom .ic{width:24px;height:24px}
.pill .ic{width:20px;height:20px}
:root[data-skin] .drawer-head .pill .ic{filter:var(--ic-f) drop-shadow(0 0 1.5px rgba(255,255,255,.9))}
.topic .more .ic,.mem .more .ic{width:22px;height:22px}
#updBar #btnUpdX .ic{width:18px;height:18px;margin:auto}
.att .x{background:none;width:26px;height:26px;top:-8px;right:-8px;display:grid;place-items:center}
.att .x .ic{width:24px;height:24px;filter:var(--ic-f) drop-shadow(0 1px 2px rgba(0,0,0,.35))}
.opt .ic{width:28px;height:28px}
.model .ic.chev{width:16px;height:16px}
.row-btn .ic{width:26px;height:26px}
.websearch{display:inline-flex;align-items:center;gap:6px;opacity:.85}
.websearch .ic{width:22px;height:22px}

/* 正在作图：珐琅图标轻浮动 + 皮肤色光晕（ECHO 动画说明） */
.drawing{display:flex;flex-direction:column;align-items:center;gap:10px;padding:14px 0 6px;width:100%;max-width:320px;overflow:hidden;contain:paint}
.dw-art{position:relative;width:96px;height:96px;display:grid;place-items:center;flex:none}
.dw-glow{position:absolute;left:4px;top:4px;width:88px;height:88px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,color-mix(in srgb,var(--accent) 70%,transparent) 0%,transparent 70%);opacity:var(--dw-o1,.18);animation:dwGlow 3.2s ease-in-out infinite;will-change:transform,opacity}
:root[data-skin] .dw-glow{background:var(--accent-img);-webkit-mask:radial-gradient(circle,#000 0%,transparent 70%);mask:radial-gradient(circle,#000 0%,transparent 70%)}
.dw-ic{position:relative;width:48px;height:48px;animation:dwFloat 2.4s ease-in-out infinite;will-change:transform}
.dw-t{color:var(--sub);font-size:15px;line-height:1.4;height:1.4em}
@keyframes dwFloat{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-4px) scale(1.04)}}
@keyframes dwGlow{0%,100%{transform:scale(.85);opacity:var(--dw-o1,.18)}50%{transform:scale(1.15);opacity:var(--dw-o2,.32)}}
@media (prefers-color-scheme:light){:root:not([data-skin]) .dw-glow{--dw-o1:.3;--dw-o2:.5;background:radial-gradient(circle,var(--accent) 0%,transparent 70%)}}
@media (prefers-reduced-motion:reduce){.dw-ic,.dw-glow{animation:none}.dw-glow{opacity:.24}}

/* 切换模型提示：居中背板，随皮肤配色，不挡操作 */
#mtoast{position:fixed;left:50%;top:42%;z-index:61;pointer-events:none;transform:translate(-50%,-50%);
  display:flex;flex-direction:column;align-items:center;gap:6px;min-width:180px;max-width:80vw;padding:20px 28px 18px;border-radius:24px;
  background:var(--bubble-img,linear-gradient(135deg,var(--card),var(--soft)));color:var(--fg);border:1px solid var(--line);
  box-shadow:0 14px 44px var(--glow,rgba(0,0,0,.18)),0 2px 8px rgba(0,0,0,.08);text-align:center;opacity:0}
#mtoast.on{animation:mtPop 2.1s ease forwards}
#mtoast .brand{width:48px;height:48px;margin-bottom:4px;box-shadow:0 3px 10px rgba(0,0,0,.15)}
#mtoast .brand svg{width:28px;height:28px}
#mtoast .mt-s{font-size:13px;color:var(--sub)}
#mtoast .mt-n{font-size:19px;font-weight:600;line-height:1.3;word-break:break-word}
@keyframes mtPop{0%{opacity:0;transform:translate(-50%,-50%) scale(.85)}12%{opacity:1;transform:translate(-50%,-50%) scale(1.03)}20%,78%{opacity:1;transform:translate(-50%,-50%) scale(1)}100%{opacity:0;transform:translate(-50%,-50%) scale(.96)}}
@media (prefers-reduced-motion:reduce){@keyframes mtPop{0%{opacity:0}10%,80%{opacity:1}100%{opacity:0}}}