/* ==========================================================================
   AI 网页版 · 公共样式 v2
   iOS Liquid Glass 质感 · 年轻化配色 · 移动端拇指优先
   ⚠ 本文件不得删除 .convs .conv .del .msg .who .body .bubble .foot .fee
     .typing .code .bar2 .lang .cp .tabs .field .card .chip .bar .avatar
     .atts .att .tool .spin .rm .msg-atts .thumb .filechip .zoom 等
     类名 —— 均由 ai.js 动态生成，删了样式就丢。
   ========================================================================== */
:root{
  --bg:#eef1f7;
  --glass:rgba(255,255,255,.72);
  --glass2:rgba(255,255,255,.60);
  --glass3:rgba(255,255,255,.44);
  --line:rgba(255,255,255,.65);          /* 玻璃高光描边 */
  --line2:rgba(16,24,40,.12);
  --hair:rgba(16,24,40,.07);             /* 极细分隔线 */
  --tx:#14161b;
  --tx2:#565c68;
  --tx3:#98a0ad;
  --accent:#0A6CFF;
  --accent2:#12B886;
  --danger:#F04A52;
  --grad-a:linear-gradient(135deg,#7FB0FF 0%,#0A6CFF 52%,#3FC8FF 100%);
  --grad-b:linear-gradient(135deg,#4ADE9B 0%,#12B886 55%,#2BD9C4 100%);
  --grad-pink:linear-gradient(135deg,#FF8FB8 0%,#FF5C8A 100%);
  --radius:20px;
  --radius-sm:14px;
  --radius-lg:26px;
  --blur:blur(30px) saturate(190%);
  --blur-s:blur(16px) saturate(185%);
  --shadow:
    0 1px 0 rgba(255,255,255,.75) inset,
    0 0 0 .5px rgba(16,24,40,.05),
    0 10px 30px -8px rgba(16,24,40,.14),
    0 2px 6px rgba(16,24,40,.04);
  --shadow-lg:
    0 1px 0 rgba(255,255,255,.70) inset,
    0 26px 64px -18px rgba(16,24,40,.26),
    0 2px 8px rgba(16,24,40,.06);
  --appH:100vh;
}
@supports (height:100dvh){ :root{ --appH:100dvh; } }

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  margin:0;
  font:15px/1.68 -apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Segoe UI","Microsoft YaHei",Helvetica,Arial,sans-serif;
  color:var(--tx);
  background-color:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;                        /* 聊天页锁滚动；落地页用 body.lp 放开 */
}
/* iOS Safari 不支持 body 的 background-attachment:fixed，
   所以底色与光斑统统挂到 fixed 伪元素上，滚动时不撕裂。 */
body::after{
  content:'';position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    radial-gradient(820px 640px at 6% -8%,  rgba(91,140,255,.34), transparent 62%),
    radial-gradient(720px 580px at 98% 2%,  rgba(79,209,255,.28), transparent 60%),
    radial-gradient(760px 640px at 88% 96%, rgba(255,92,138,.20), transparent 62%),
    radial-gradient(660px 560px at 8% 96%,  rgba(18,184,134,.20), transparent 60%);
}
/* 落地页：放开滚动交给文档流，保证 iOS 惯性滚动与 sticky 顶栏正常 */
body.lp{overflow:visible;height:auto;min-height:100%}

/* 漂浮光斑，让玻璃有东西可透 */
body::before{
  content:'';position:fixed;inset:-12%;z-index:-1;pointer-events:none;
  background:
    radial-gradient(closest-side, rgba(122,162,255,.42), transparent) 14% 20% / 40% 44% no-repeat,
    radial-gradient(closest-side, rgba(255,122,178,.34), transparent) 86% 74% / 38% 42% no-repeat,
    radial-gradient(closest-side, rgba(46,214,190,.30), transparent) 60% 92% / 34% 38% no-repeat;
  filter:blur(52px);
  animation:drift 26s ease-in-out infinite alternate;
}
@keyframes drift{
  0%  {transform:translate3d(0,0,0) scale(1)}
  50% {transform:translate3d(2.4%,-1.8%,0) scale(1.06)}
  100%{transform:translate3d(-2%,2.2%,0) scale(1.02)}
}
@media (prefers-reduced-motion:reduce){
  body::before{animation:none}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:none;padding:0}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:var(--line2);border-radius:8px;border:2px solid transparent;background-clip:padding-box}
::-webkit-scrollbar-thumb:hover{background:rgba(16,24,40,.22);border:2px solid transparent;background-clip:padding-box}
::-webkit-scrollbar-track{background:transparent}

.app{display:flex;height:var(--appH);gap:14px;padding:14px;position:relative;z-index:0}
.glass{
  background:linear-gradient(152deg, rgba(255,255,255,.80), rgba(255,255,255,.56));
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
}

/* ============================ 侧栏 ============================ */
.side{width:272px;flex:0 0 272px;display:flex;flex-direction:column;overflow:hidden}
.brand{padding:20px 16px 12px;display:flex;align-items:center;gap:11px}
.logo{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;font-weight:700;color:#fff;font-size:15px;
  background:var(--grad-a);box-shadow:0 6px 16px rgba(10,108,255,.32), 0 1px 0 rgba(255,255,255,.5) inset;flex:none}
.logo.g{background:var(--grad-b);box-shadow:0 6px 16px rgba(18,184,134,.32), 0 1px 0 rgba(255,255,255,.5) inset}
.brand h1{font-size:15.5px;margin:0;font-weight:680;letter-spacing:.2px}
.brand p{margin:1px 0 0;font-size:11.5px;color:var(--tx3)}

.btn-new{
  margin:6px 14px 6px;padding:11px 13px;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:var(--glass3);
  box-shadow:0 1px 0 rgba(255,255,255,.8) inset, 0 2px 8px rgba(16,24,40,.06);
  display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:600;color:var(--tx);
  transition:transform .18s cubic-bezier(.2,.8,.3,1), border-color .18s, color .18s;
}
.btn-new:hover{border-color:rgba(10,108,255,.5);color:var(--accent);transform:translateY(-1px)}
.btn-new:active{transform:scale(.985)}
.btn-new svg{flex:none;opacity:.85}

.convs{flex:1;overflow-y:auto;overscroll-behavior:contain;padding:6px 10px 12px}
.convs-h{font-size:10.5px;letter-spacing:1px;text-transform:uppercase;color:var(--tx3);padding:10px 10px 6px;font-weight:600}
.conv{padding:10px 11px;border-radius:var(--radius-sm);display:flex;align-items:center;gap:8px;
  font-size:13.5px;color:var(--tx2);transition:background .16s,color .16s;cursor:pointer;border:1px solid transparent}
.conv:hover{background:rgba(255,255,255,.72);color:var(--tx)}
.conv.active{background:rgba(10,108,255,.12);border-color:rgba(10,108,255,.26);color:var(--tx);font-weight:600}
.conv span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv .del{opacity:0;color:var(--tx3);font-size:17px;line-height:1;padding:4px 7px;border-radius:8px;transition:.16s;flex:none}
.conv:hover .del{opacity:.7}
.conv .del:hover{opacity:1;color:var(--danger);background:rgba(240,74,82,.12)}

.side-foot{padding:12px 14px;border-top:1px solid var(--hair);background:rgba(255,255,255,.34)}
.quota{font-size:11.5px;color:var(--tx3);line-height:1.75}
.quota b{color:var(--tx2);font-weight:650}
.bar{height:6px;border-radius:99px;background:rgba(16,24,40,.09);overflow:hidden;margin:7px 0}
.bar i{display:block;height:100%;border-radius:99px;background:var(--grad-a);transition:width .45s cubic-bezier(.2,.8,.3,1)}
.bar.low i{background:var(--grad-pink)}
.user{display:flex;align-items:center;gap:10px;padding:10px 11px;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:var(--glass3);margin-top:10px}
.avatar{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;font-size:12.5px;font-weight:680;color:#fff;
  background:var(--grad-b);flex:none;box-shadow:0 3px 8px rgba(18,184,134,.28)}
.user .info{flex:1;min-width:0}
.user .info b{display:block;font-size:13px;font-weight:620;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user .info em{display:block;font-style:normal;font-size:11px;color:var(--tx3)}
.user .out{color:var(--tx3);font-size:12px;padding:7px 9px;border-radius:9px;flex:none}
.user .out:hover{color:var(--danger);background:rgba(240,74,82,.12)}

/* ============================ 主区 ============================ */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}
.topbar{display:flex;align-items:center;gap:10px;padding:11px 16px;border-bottom:1px solid var(--hair);
  flex:none;background:rgba(255,255,255,.42);backdrop-filter:var(--blur-s);-webkit-backdrop-filter:var(--blur-s)}
.topbar .title{font-size:14.5px;font-weight:660;margin-right:2px;letter-spacing:.1px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar .sub{font-size:11.5px;color:var(--tx3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tbinfo{min-width:0}
.spacer{flex:1}
.sel{
  appearance:none;-webkit-appearance:none;padding:8px 30px 8px 13px;border-radius:12px;
  border:1px solid var(--line);background:var(--glass3);font-size:12.5px;color:var(--tx2);font-weight:550;
  background-image:linear-gradient(45deg,transparent 50%,var(--tx3) 50%),linear-gradient(135deg,var(--tx3) 50%,transparent 50%);
  background-position:calc(100% - 16px) 50%,calc(100% - 11px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;
  transition:.16s;max-width:150px;
}
.sel:hover{color:var(--tx);border-color:rgba(10,108,255,.45)}
.tbtn{padding:8px 13px;border-radius:12px;border:1px solid var(--line);background:var(--glass3);
  font-size:12.5px;color:var(--tx2);font-weight:550;text-decoration:none;transition:.16s;white-space:nowrap}
.tbtn:hover{color:var(--accent);border-color:rgba(10,108,255,.45);transform:translateY(-1px)}
.tbtn:active{transform:scale(.97)}
.tbtn.primary{background:var(--grad-a);border-color:transparent;color:#fff;box-shadow:0 4px 14px rgba(10,108,255,.30)}
.tbtn.primary:hover{filter:brightness(1.06);color:#fff}

.chat{flex:1;overflow-y:auto;overscroll-behavior:contain;padding:26px 8px 10px;scroll-behavior:smooth}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
.empty{padding:52px 0 34px;text-align:center;color:var(--tx3)}
.empty h2{margin:0 0 10px;font-size:24px;font-weight:700;color:var(--tx);letter-spacing:-.2px;
  background:var(--grad-a);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.empty p{margin:0;font-size:13.5px;line-height:1.8}
.chips{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;margin-top:24px}
.chip{padding:9px 15px;border-radius:99px;border:1px solid var(--line);background:var(--glass3);
  font-size:13px;color:var(--tx2);font-weight:520;transition:.18s cubic-bezier(.2,.8,.3,1);
  box-shadow:0 1px 0 rgba(255,255,255,.8) inset, 0 2px 8px rgba(16,24,40,.05)}
.chip:hover{color:var(--accent);border-color:rgba(10,108,255,.5);transform:translateY(-2px);
  box-shadow:0 1px 0 rgba(255,255,255,.8) inset, 0 8px 20px rgba(10,108,255,.18)}
.chip:active{transform:scale(.97)}

.msg{display:flex;gap:12px;padding:14px 0;animation:rise .34s cubic-bezier(.2,.8,.3,1)}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg .who{width:32px;height:32px;border-radius:11px;flex:none;display:grid;place-items:center;font-size:12px;font-weight:680;color:#fff;
  box-shadow:0 1px 0 rgba(255,255,255,.45) inset}
.msg.user .who{background:var(--grad-a);box-shadow:0 4px 12px rgba(10,108,255,.28), 0 1px 0 rgba(255,255,255,.45) inset}
.msg.ai .who{background:var(--grad-b);box-shadow:0 4px 12px rgba(18,184,134,.28), 0 1px 0 rgba(255,255,255,.45) inset}
.msg.err .who{background:var(--grad-pink)}
.msg .body{flex:1;min-width:0;max-width:calc(100% - 44px)}
.msg .head{font-size:11.5px;color:var(--tx3);margin:2px 0 6px}
.bubble{border-radius:var(--radius);padding:13px 17px;border:1px solid var(--line);
  background:linear-gradient(150deg, rgba(255,255,255,.86), rgba(255,255,255,.62));
  box-shadow:0 1px 0 rgba(255,255,255,.8) inset, 0 6px 18px -6px rgba(16,24,40,.12);
  overflow-wrap:anywhere}
.msg.user .bubble{background:var(--grad-a);border-color:transparent;color:#fff;
  box-shadow:0 8px 22px -6px rgba(10,108,255,.42), 0 1px 0 rgba(255,255,255,.35) inset;
  border-top-right-radius:8px;white-space:pre-wrap}
.msg.ai .bubble{border-top-left-radius:8px}
.msg .foot{display:flex;gap:10px;align-items:center;font-size:11px;color:var(--tx3);margin-top:8px;flex-wrap:wrap}
.msg .foot .fee{padding:2px 9px;border-radius:99px;background:rgba(18,184,134,.14);color:#0B8F66;font-weight:600}
.msg .foot .fee.paid{background:rgba(10,108,255,.13);color:var(--accent)}
.msg.err .bubble{border-color:rgba(240,74,82,.4);background:rgba(240,74,82,.07);color:var(--danger)}
.typing{display:inline-flex;gap:5px;align-items:center;padding:3px 0}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--tx3);animation:bounce 1.2s infinite}
.typing i:nth-child(2){animation-delay:.18s}
.typing i:nth-child(3){animation-delay:.36s}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.35}30%{transform:translateY(-5px);opacity:1}}

/* ---------------------- Markdown ---------------------- */
.md>*:first-child{margin-top:0}
.md>*:last-child{margin-bottom:0}
.md p{margin:0 0 13px}
.md h1,.md h2,.md h3,.md h4{margin:22px 0 11px;line-height:1.35;font-weight:680;letter-spacing:-.1px}
.md h1{font-size:20px}.md h2{font-size:18px}.md h3{font-size:16px}.md h4{font-size:14.5px}
.md ul,.md ol{margin:0 0 13px;padding-left:22px}
.md li{margin:5px 0}
.md a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.md blockquote{margin:0 0 13px;padding:9px 15px;border-left:3px solid var(--accent);color:var(--tx2);
  background:rgba(10,108,255,.07);border-radius:0 12px 12px 0}
.md hr{border:none;border-top:1px solid var(--hair);margin:20px 0}
.md table{border-collapse:collapse;width:100%;font-size:13.5px;margin:0 0 13px;display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
.md th,.md td{border:1px solid var(--hair);padding:8px 12px;text-align:left}
.md th{background:rgba(16,24,40,.05);font-weight:650}
.md :not(pre)>code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;
  padding:2px 7px;border-radius:7px;background:rgba(16,24,40,.08)}
.msg.user .md :not(pre)>code{background:rgba(255,255,255,.24)}

/* ---------------------- 代码块 ---------------------- */
.code{margin:0 0 15px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--line);
  background:rgba(255,255,255,.55);box-shadow:0 1px 0 rgba(255,255,255,.8) inset, 0 4px 14px -6px rgba(16,24,40,.12)}
.code .bar2{display:flex;align-items:center;gap:8px;padding:7px 9px 7px 15px;border-bottom:1px solid var(--hair);background:rgba(16,24,40,.04)}
.code .lang{font-size:11px;color:var(--tx3);letter-spacing:.5px;text-transform:lowercase;font-weight:600}
.code .cp{margin-left:auto;font-size:11.5px;color:var(--tx2);padding:5px 12px;border-radius:9px;border:1px solid var(--line2);
  background:rgba(255,255,255,.7);font-weight:550;transition:.16s}
.code .cp:hover{color:var(--accent);border-color:rgba(10,108,255,.5)}
.code .cp.done{color:var(--accent2);border-color:rgba(18,184,134,.5)}
.code pre{margin:0;padding:15px 17px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.code code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.72;white-space:pre}
.tk-str{color:#C0392B}.tk-com{color:#8A94A6;font-style:italic}.tk-num{color:#1A6FD4}
.tk-kw{color:#9333EA}.tk-fn{color:#0A6CFF}

/* ---------------------- 输入区 ---------------------- */
.composer{flex:none;padding:12px 16px 16px;border-top:1px solid var(--hair);background:rgba(255,255,255,.34)}
.composer .inner{max-width:820px;margin:0 auto;border:1px solid var(--line);border-radius:22px;
  background:linear-gradient(150deg, rgba(255,255,255,.86), rgba(255,255,255,.62));
  box-shadow:0 1px 0 rgba(255,255,255,.85) inset, 0 8px 26px -10px rgba(16,24,40,.16);
  display:flex;align-items:flex-end;gap:10px;padding:9px 10px 9px 18px;transition:border-color .2s, box-shadow .2s}
.composer .inner:focus-within{border-color:rgba(10,108,255,.55);box-shadow:0 0 0 4px rgba(10,108,255,.12), 0 8px 26px -10px rgba(16,24,40,.16)}
.composer textarea{flex:1;resize:none;border:none;outline:none;background:transparent;max-height:200px;min-height:26px;
  line-height:1.6;padding:7px 0;font-size:15px;color:var(--tx)}
.composer textarea::placeholder{color:var(--tx3)}
.send{width:40px;height:40px;border-radius:14px;flex:none;display:grid;place-items:center;color:#fff;
  background:var(--grad-a);box-shadow:0 5px 14px rgba(10,108,255,.34), 0 1px 0 rgba(255,255,255,.4) inset;transition:.16s}
.send:hover{filter:brightness(1.07)}
.send:active{transform:scale(.94)}
.send[disabled]{background:rgba(16,24,40,.16);color:#fff;box-shadow:none;cursor:not-allowed}
.composer .hint{max-width:820px;margin:9px auto 0;font-size:11px;color:var(--tx3);text-align:center}

/* ---------------------- 附件：工具条 / 预览区 / 消息内缩略图 ---------------------- */
[hidden]{display:none !important}
.main{position:relative}

.composer .tools{max-width:820px;margin:8px auto 0;display:flex;align-items:center;gap:7px}
.tool{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 12px;border-radius:12px;
  border:1px solid var(--line);background:var(--glass3);font-size:12.5px;color:var(--tx2);font-weight:550;
  transition:.16s cubic-bezier(.2,.8,.3,1);white-space:nowrap}
.tool svg{flex:none;opacity:.82}
.tool:hover{color:var(--accent);border-color:rgba(10,108,255,.45);transform:translateY(-1px)}
.tool:active{transform:scale(.96)}
.tool.off{opacity:.40;cursor:not-allowed}
.tool.off:hover{color:var(--tx2);border-color:var(--line);transform:none}
.tool.rec{background:var(--grad-pink);border-color:transparent;color:#fff;
  box-shadow:0 4px 14px rgba(255,92,138,.34);animation:micpulse 1.15s ease-in-out infinite}
@keyframes micpulse{
  0%,100%{box-shadow:0 4px 14px rgba(255,92,138,.34)}
  50%    {box-shadow:0 4px 22px rgba(255,92,138,.62)}
}
.tools .grow{flex:1}
.tools .ctip{font-size:10.5px;color:var(--tx3)}

.atts{display:none;max-width:820px;margin:0 auto 8px;gap:8px;flex-wrap:wrap}
.atts.show{display:flex}
.att{position:relative;width:66px;height:66px;border-radius:13px;overflow:hidden;flex:none;
  border:1px solid var(--line);background:var(--glass3);box-shadow:0 2px 8px rgba(16,24,40,.08)}
.att img{width:100%;height:100%;object-fit:cover;display:block}
.att.loading{border-style:dashed;border-color:rgba(10,108,255,.50);background:rgba(10,108,255,.06)}
.att.file{width:auto;max-width:200px;height:auto;min-height:44px;padding:9px 28px 9px 12px;
  display:flex;flex-direction:column;justify-content:center}
.att .nm{font-size:12px;font-weight:620;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:158px}
.att .sz{font-size:10.5px;color:var(--tx3)}
.att .rm{position:absolute;top:2px;right:2px;width:20px;height:20px;border-radius:50%;
  display:grid;place-items:center;font-size:14px;line-height:1;color:#fff;
  background:rgba(14,18,28,.50);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);transition:.16s}
.att .rm:hover{background:var(--danger)}
.att .spin{display:block;width:18px;height:18px;margin:24px auto;border-radius:50%;
  border:2px solid rgba(16,24,40,.14);border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.msg-atts{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 9px}
.msg-atts .thumb{max-width:190px;max-height:190px;border-radius:11px;display:block;cursor:zoom-in;
  border:1px solid rgba(255,255,255,.34);background:rgba(255,255,255,.16)}
.msg-atts .thumb.gone{display:inline-flex;align-items:center;min-height:42px;padding:0 13px;cursor:default;
  font-size:12px;color:rgba(255,255,255,.78);border:1px dashed rgba(255,255,255,.42);background:rgba(255,255,255,.10)}
.msg-atts .filechip{display:inline-flex;align-items:center;min-height:30px;padding:0 12px;border-radius:99px;
  font-size:12px;color:#fff;background:rgba(255,255,255,.20);border:1px solid rgba(255,255,255,.30);
  max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg.user .bubble .txt{white-space:pre-wrap}

/* 拖拽投放提示 */
.main.drag::after{
  content:'松开即可添加图片或文件';position:absolute;inset:12px;z-index:60;pointer-events:none;
  display:grid;place-items:center;font-size:14px;font-weight:620;color:var(--accent);
  border:2px dashed rgba(10,108,255,.55);border-radius:var(--radius);background:rgba(10,108,255,.07)}

/* 图片查看器 */
.zoom{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:24px;
  background:rgba(10,12,18,.80);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  animation:fadeIn .2s ease}
.zoom img{max-width:100%;max-height:100%;border-radius:var(--radius-sm);box-shadow:var(--shadow-lg)}
.zoom .zx{position:absolute;top:calc(14px + env(safe-area-inset-top));right:14px;width:40px;height:40px;
  border-radius:13px;display:grid;place-items:center;font-size:22px;color:#fff;
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.26)}
.zoom .zx:hover{background:rgba(255,255,255,.26)}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ---------------------- Toast ---------------------- */
.toast{position:fixed;left:50%;bottom:34px;transform:translate(-50%,14px);z-index:120;
  padding:11px 20px;border-radius:16px;font-size:13.5px;font-weight:550;
  background:rgba(255,255,255,.80);border:1px solid var(--line);box-shadow:var(--shadow-lg);
  backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  opacity:0;pointer-events:none;transition:.26s cubic-bezier(.2,.8,.3,1);max-width:88vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{color:var(--danger)}
.toast.ok{color:#0B8F66}

/* ---------------------- 弹窗 ---------------------- */
.modal{position:fixed;inset:0;z-index:140;display:none;align-items:center;justify-content:center;padding:20px;
  background:rgba(14,18,28,.40);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.modal.show{display:flex}
.card{width:100%;max-width:392px;padding:28px;border-radius:28px;position:relative;
  background:linear-gradient(152deg, rgba(255,255,255,.90), rgba(255,255,255,.72));
  border:1px solid var(--line);box-shadow:var(--shadow-lg);
  backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  animation:pop .28s cubic-bezier(.2,.9,.3,1.1)}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.96)}to{opacity:1;transform:none}}
.card h3{margin:0 0 5px;font-size:20px;font-weight:700;letter-spacing:-.2px}
.card .tip{margin:0 0 20px;font-size:12.5px;color:var(--tx3)}
.tabs{display:flex;gap:4px;padding:4px;margin-bottom:18px;border-radius:14px;background:rgba(16,24,40,.06)}
.tabs button{flex:1;padding:9px;border-radius:11px;font-size:13px;color:var(--tx2);font-weight:550;transition:.18s}
.tabs button.on{background:rgba(255,255,255,.92);color:var(--tx);font-weight:650;
  box-shadow:0 1px 0 rgba(255,255,255,.9) inset, 0 2px 8px rgba(16,24,40,.10)}
.field{margin-bottom:13px}
.field label{display:block;font-size:11.5px;color:var(--tx3);margin-bottom:6px;font-weight:600}
.field input{width:100%;height:46px;padding:0 15px;border-radius:14px;outline:none;font-size:16px;
  border:1px solid var(--line2);background:rgba(255,255,255,.72);transition:.18s}
.field input:focus{border-color:rgba(10,108,255,.6);box-shadow:0 0 0 4px rgba(10,108,255,.12)}
.card .err{min-height:18px;font-size:12px;color:var(--danger);margin:2px 0 8px;text-align:center}
.card .primary{width:100%;height:46px;border-radius:14px;background:var(--grad-a);color:#fff;font-weight:650;font-size:14.5px;
  box-shadow:0 6px 18px rgba(10,108,255,.30), 0 1px 0 rgba(255,255,255,.35) inset;transition:.18s}
.card .primary:hover{filter:brightness(1.06)}
.card .primary:active{transform:scale(.99)}
.card .x{position:absolute;top:14px;right:14px;width:32px;height:32px;border-radius:10px;color:var(--tx3);display:grid;place-items:center;font-size:19px}
.card .x:hover{background:rgba(16,24,40,.08);color:var(--tx)}
.card .foot{margin-top:15px;font-size:11.5px;color:var(--tx3);text-align:center;line-height:1.75}

/* ============================ 触屏：无 hover 环境 ============================ */
@media (hover:none){
  .conv .del{opacity:.55}
  .code .cp{opacity:1}
  .chat{scroll-behavior:auto}
}

/* ============================ 移动端 ============================ */
.mask{display:none}
.mbtn{display:none}
@media (max-width:820px){
  .app{padding:0;gap:0}
  .side{
    position:fixed;top:0;bottom:0;left:0;width:84vw;max-width:308px;z-index:80;border-radius:0;border:none;
    box-shadow:14px 0 44px rgba(16,24,40,.20);
    transform:translateX(-104%);transition:transform .28s cubic-bezier(.2,.8,.3,1);
    padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom);
    background:linear-gradient(152deg, rgba(255,255,255,.94), rgba(255,255,255,.86));
  }
  .side.open{transform:none}
  .mask{display:block;position:fixed;inset:0;z-index:70;background:rgba(14,18,28,.36);
    backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);
    opacity:0;pointer-events:none;transition:opacity .28s}
  .mask.show{opacity:1;pointer-events:auto}
  .main{border-radius:0;border:none}
  .mbtn{display:grid;width:40px;height:40px;padding:0;place-items:center;border-radius:12px;font-size:17px}

  /* 顶栏：刘海屏留白 + 压缩下拉与切换按钮 */
  .topbar{
    gap:8px;padding:calc(8px + env(safe-area-inset-top)) 12px 8px;
    background:linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.62));
    backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  }
  .tbinfo{flex:1;min-width:0}
  .topbar .title{font-size:15px}
  .topbar .sub{display:block;font-size:10.5px;line-height:1.4;margin-top:1px}
  .sel{padding:8px 26px 8px 10px;font-size:12px;max-width:120px;background-position:calc(100% - 14px) 50%,calc(100% - 9px) 50%}
  /* 互跳按钮 → 圆形图标按钮（纯 CSS 替换文字，不动 HTML/JS） */
  #peer{width:40px;height:40px;padding:0;font-size:0;display:grid;place-items:center;border-radius:13px;overflow:hidden}
  #peer::after{content:'⇄';font-size:18px;line-height:1;color:var(--tx2)}

  .wrap{padding:0 13px}
  .chat{padding:14px 0 6px;-webkit-overflow-scrolling:touch}
  .empty{padding:34px 0 26px}
  .empty h2{font-size:21px}
  .msg{gap:9px;padding:12px 0}
  .msg .who{width:28px;height:28px;border-radius:9px;font-size:11px}
  .msg .body{max-width:calc(100% - 37px)}
  .bubble{padding:12px 14px;border-radius:17px}
  .msg.user .bubble{border-top-right-radius:7px}
  .msg.ai .bubble{border-top-left-radius:7px}
  .code pre{padding:13px 14px}
  .code code{font-size:12.5px}
  .md h1{font-size:18.5px}.md h2{font-size:17px}.md h3{font-size:15.5px}

  /* 输入区：贴底 + Home 指示条留白 */
  .composer{padding:9px 11px calc(9px + env(safe-area-inset-bottom))}
  .composer .inner{border-radius:19px;padding:7px 8px 7px 15px;gap:8px}
  .composer textarea{font-size:16px;padding:9px 0;line-height:1.55}   /* 防 iOS 聚焦自动放大 */
  .send{width:44px;height:44px;border-radius:15px}
  .composer .hint{margin:7px auto 0;font-size:10.5px}

  /* 附件：拇指热区 ≥40px，副提示在窄屏隐藏让位 */
  .composer .tools{gap:6px;margin-top:7px}
  .tool{min-height:40px;padding:0 11px}
  .tool span{font-size:12.5px}
  .tools .ctip{display:none}
  .atts{margin-bottom:7px;gap:7px}
  .att{width:58px;height:58px;border-radius:12px}
  .att .spin{margin:20px auto}
  .att .rm{width:24px;height:24px;font-size:16px}
  .msg-atts .thumb{max-width:150px;max-height:150px}

  /* 会话列表：拇指热区 */
  .conv{min-height:46px;padding:12px 12px}
  .conv .del{padding:8px 11px}
  .btn-new{min-height:46px}
  .tabs button{min-height:42px}

  /* Toast 移到顶部，避开软键盘 */
  .toast{top:calc(12px + env(safe-area-inset-top));bottom:auto;transform:translate(-50%,-14px)}
  .toast.show{transform:translate(-50%,0)}

  /* 弹窗：接近满宽 + 可滚动 */
  .modal{padding:14px;align-items:center}
  .card{max-width:420px;padding:24px 20px;border-radius:26px;max-height:88vh;overflow-y:auto;-webkit-overflow-scrolling:touch}
}
/* 极窄屏：模型选择器收起（保留语言选择） */
@media (max-width:560px){
  #model{display:none}
  .sel{max-width:44vw}
}