/* ============ tokens ============ */
:root{
  --bg:#f6f7f9; --bg-elev:#ffffff; --bg-sunk:#eef0f3;
  --line:#e2e5ea; --line-soft:#edeff3;
  --ink:#11151c; --ink-2:#4a5361; --ink-3:#79828f;
  --brand:#4f46e5; --brand-2:#6366f1; --brand-soft:#eef2ff; --brand-ink:#fff;
  --ok:#0f9960; --ok-soft:#e6f6ee;
  --warn:#b45309; --warn-soft:#fef4e6;
  --err:#d92d20; --err-soft:#fef3f2;
  --shadow-sm:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.04);
  --shadow-md:0 4px 12px rgba(16,24,40,.07),0 2px 4px rgba(16,24,40,.04);
  --shadow-lg:0 18px 40px rgba(16,24,40,.12),0 4px 10px rgba(16,24,40,.06);
  --r-sm:7px; --r:10px; --r-lg:14px; --r-xl:20px;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --sidebar-w:248px;
}
[data-theme="dark"]{
  --bg:#0b0d12; --bg-elev:#13161d; --bg-sunk:#0f1218;
  --line:#232833; --line-soft:#1b1f28;
  --ink:#eef1f6; --ink-2:#a3adbd; --ink-3:#6c7686;
  --brand:#6366f1; --brand-2:#818cf8; --brand-soft:#1e1b4b; --brand-ink:#fff;
  --ok:#3ddc97; --ok-soft:#0d2a1f;
  --warn:#f0b429; --warn-soft:#2b210a;
  --err:#ff6b6b; --err-soft:#2d1214;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow-md:0 4px 14px rgba(0,0,0,.45);
  --shadow-lg:0 20px 48px rgba(0,0,0,.6);
}
*,*::before,*::after{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:14px;line-height:1.55;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility}
[hidden]{display:none!important}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.018em}
::selection{background:var(--brand);color:#fff}

/* ============ login ============ */
.auth-wrap{min-height:100dvh;display:grid;place-items:center;padding:24px;position:relative;overflow:hidden}
.auth-bg{position:absolute;inset:0;z-index:0;filter:blur(70px);opacity:.5}
.auth-bg span{position:absolute;border-radius:50%;display:block}
.auth-bg span:nth-child(1){width:460px;height:460px;background:var(--brand);top:-140px;left:-100px;opacity:.4}
.auth-bg span:nth-child(2){width:380px;height:380px;background:#0ea5e9;bottom:-120px;right:-80px;opacity:.28}
.auth-bg span:nth-child(3){width:300px;height:300px;background:#a855f7;top:45%;left:52%;opacity:.2}
.auth-card{position:relative;z-index:1;width:100%;max-width:396px;background:var(--bg-elev);
  border:1px solid var(--line);border-radius:var(--r-xl);padding:32px;box-shadow:var(--shadow-lg)}
.auth-brand{display:flex;gap:13px;align-items:center;margin-bottom:26px}
.auth-brand h1{font-size:19px}
.auth-brand p{margin:1px 0 0;color:var(--ink-3);font-size:12.5px}
.logo-mark{width:42px;height:42px;flex:0 0 42px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand),var(--brand-2));color:#fff;font-size:19px;
  box-shadow:0 5px 14px color-mix(in srgb,var(--brand) 40%,transparent)}
.logo-mark.sm{width:29px;height:29px;flex:0 0 29px;border-radius:9px;font-size:14px}
.auth-foot{margin:20px 0 0;text-align:center;color:var(--ink-3);font-size:11.5px}
.auth-foot span{font-family:var(--mono)}

/* ============ forms ============ */
.field{display:block;margin-bottom:15px}
.field>span{display:block;font-size:12.5px;font-weight:500;color:var(--ink-2);margin-bottom:6px}
.field>span em{font-style:normal;color:var(--ink-3);font-weight:400}
.field.sm>span{font-size:11.5px}
input[type=text],input[type=password],input[type=number],textarea,select{
  width:100%;padding:9px 12px;background:var(--bg-sunk);color:var(--ink);
  border:1px solid var(--line);border-radius:var(--r);font:inherit;font-size:13.5px;
  transition:border-color .15s,box-shadow .15s,background .15s;outline:none}
textarea{resize:vertical;line-height:1.6;min-height:76px}
input:focus,textarea:focus,select:focus{border-color:var(--brand);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 18%,transparent);background:var(--bg-elev)}
input::placeholder,textarea::placeholder{color:var(--ink-3)}
input[type=range]{padding:0;height:5px;-webkit-appearance:none;appearance:none;background:var(--line);
  border:0;border-radius:99px;margin-top:9px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:15px;height:15px;border-radius:50%;
  background:var(--brand);cursor:pointer;border:2px solid var(--bg-elev);box-shadow:var(--shadow-sm)}
input[type=range]::-moz-range-thumb{width:15px;height:15px;border-radius:50%;background:var(--brand);
  cursor:pointer;border:2px solid var(--bg-elev)}
.check{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ink-2);cursor:pointer;user-select:none}
.check input{accent-color:var(--brand);width:15px;height:15px;cursor:pointer}

/* ============ buttons ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 15px;
  border-radius:var(--r);border:1px solid transparent;font:inherit;font-size:13.5px;font-weight:500;
  cursor:pointer;transition:transform .09s,background .15s,border-color .15s,opacity .15s;white-space:nowrap}
.btn:active{transform:translateY(.5px)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn.primary{background:var(--brand);color:var(--brand-ink);
  box-shadow:0 1px 2px rgba(0,0,0,.16),inset 0 1px 0 rgba(255,255,255,.13)}
.btn.primary:hover:not(:disabled){background:var(--brand-2)}
.btn.ghost{background:var(--bg-elev);border-color:var(--line);color:var(--ink-2)}
.btn.ghost:hover{border-color:var(--ink-3);color:var(--ink)}
.btn.danger{background:transparent;border-color:transparent;color:var(--err);padding:5px 9px}
.btn.danger:hover{background:var(--err-soft)}
.btn.block{width:100%;padding:11px}
.btn.sm{padding:6px 11px;font-size:12.5px}
.btn.loading .btn-label{opacity:.45}
.btn svg{width:15px;height:15px;flex:0 0 15px}
.icon-btn svg{width:16px;height:16px;flex:0 0 16px}
.icon-btn{width:31px;height:31px;display:grid;place-items:center;background:transparent;
  border:1px solid transparent;border-radius:8px;color:var(--ink-3);cursor:pointer;transition:.15s}
.icon-btn:hover{background:var(--bg-sunk);color:var(--ink);border-color:var(--line)}

/* ============ shell ============ */
.shell{display:grid;grid-template-columns:var(--sidebar-w) 1fr;min-height:100dvh}
.sidebar{background:var(--bg-elev);border-right:1px solid var(--line);display:flex;flex-direction:column;
  padding:18px 13px;position:sticky;top:0;height:100dvh}
.side-brand{display:flex;align-items:center;gap:9px;padding:4px 8px 20px;font-weight:600;font-size:14.5px;letter-spacing:-.02em}
.side-nav{display:flex;flex-direction:column;gap:2px;flex:1}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:var(--r);
  background:transparent;border:0;color:var(--ink-2);font:inherit;font-size:13.5px;font-weight:450;
  cursor:pointer;text-align:left;transition:background .14s,color .14s;position:relative}
.nav-item:hover{background:var(--bg-sunk);color:var(--ink)}
.nav-item.active{background:var(--brand-soft);color:var(--brand);font-weight:550}
[data-theme="dark"] .nav-item.active{color:var(--brand-2)}
.nav-item svg{width:16px;height:16px;flex:0 0 16px;opacity:.85}
.side-foot{border-top:1px solid var(--line-soft);padding-top:13px;margin-top:8px}
.status-chip{display:flex;align-items:center;gap:7px;padding:6px 10px;border-radius:99px;
  background:var(--bg-sunk);font-size:11.5px;color:var(--ink-2);margin-bottom:11px;font-weight:450}
.status-chip .dot{width:7px;height:7px;border-radius:50%;background:var(--ink-3);flex:0 0 7px}
.status-chip.ok .dot{background:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb,var(--ok) 22%,transparent)}
.status-chip.bad .dot{background:var(--err);box-shadow:0 0 0 3px color-mix(in srgb,var(--err) 22%,transparent)}
.user-row{display:flex;align-items:center;gap:9px}
.avatar{width:31px;height:31px;flex:0 0 31px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand),var(--brand-2));color:#fff;font-size:12.5px;font-weight:600}
.user-meta{flex:1;min-width:0;display:flex;flex-direction:column;line-height:1.3}
.user-meta strong{font-size:13px;font-weight:550;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-meta span{font-size:11px;color:var(--ink-3)}

/* ============ main ============ */
.main{min-width:0;display:flex;flex-direction:column;min-height:100dvh}
.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;
  padding:22px 30px 18px;border-bottom:1px solid var(--line);background:var(--bg);
  position:sticky;top:0;z-index:20;backdrop-filter:blur(8px)}
.topbar h2{font-size:20px}
.topbar p{margin:2px 0 0;color:var(--ink-3);font-size:13px}
.topbar-actions{display:flex;gap:7px;align-items:center}
.view{padding:24px 30px 44px;display:flex;flex-direction:column;gap:18px;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}

/* ============ panels & stats ============ */
.panel{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:19px;box-shadow:var(--shadow-sm)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:15px}
.panel-head h3{font-size:14.5px}
.muted{color:var(--ink-3);font-size:12.5px}
.panel-row{display:grid;grid-template-columns:2fr 1fr;gap:18px}
.panel-row .span2{grid-column:auto}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat-card{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:17px 18px;box-shadow:var(--shadow-sm);transition:border-color .18s,transform .18s}
.stat-card:hover{border-color:color-mix(in srgb,var(--brand) 38%,var(--line));transform:translateY(-1px)}
.stat-head{display:flex;align-items:center;justify-content:space-between;color:var(--ink-3);
  font-size:12px;font-weight:500;margin-bottom:9px}
.stat-head svg{width:15px;height:15px;opacity:.6}
.stat-card strong{display:block;font-size:26px;font-weight:650;letter-spacing:-.03em;line-height:1.15}
.stat-card small{display:block;color:var(--ink-3);font-size:11.5px;margin-top:3px}
.kv{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.kv li{display:flex;justify-content:space-between;gap:12px;font-size:13px;padding-bottom:9px;
  border-bottom:1px solid var(--line-soft)}
.kv li:last-child{border:0;padding-bottom:0}
.kv span{color:var(--ink-3)}
.kv b{font-weight:550;font-family:var(--mono);font-size:12px}

/* chart */
.chart-wrap{position:relative;height:200px}
#chart{width:100%;height:200px;display:block;overflow:visible}
.empty-inline{position:absolute;inset:0;display:grid;place-items:center;color:var(--ink-3);font-size:13px}
.task-bars{display:flex;flex-direction:column;gap:11px}
.tb-row{display:grid;grid-template-columns:130px 1fr 78px;align-items:center;gap:13px;font-size:12.5px}
.tb-track{height:7px;background:var(--bg-sunk);border-radius:99px;overflow:hidden}
.tb-fill{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2));border-radius:99px;
  transition:width .5s cubic-bezier(.4,0,.2,1)}
.tb-row b{font-family:var(--mono);font-size:11.5px;color:var(--ink-2);text-align:right;font-weight:500}

/* ============ playground ============ */
.pg-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:stretch}
.pg-grid>.panel{display:flex;flex-direction:column}
.pg-grid>.panel:last-child .output{flex:1}
.preset-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:15px}
.chip{padding:5px 11px;border-radius:99px;border:1px solid var(--line);background:var(--bg-sunk);
  color:var(--ink-2);font:inherit;font-size:12px;font-weight:450;cursor:pointer;transition:.14s}
.chip:hover{border-color:var(--ink-3);color:var(--ink)}
.chip.active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:500}
.param-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.param-row .field{margin-bottom:12px}
.pg-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-top:13px;border-top:1px solid var(--line-soft)}
.output{min-height:290px;max-height:520px;overflow-y:auto;background:var(--bg-sunk);
  border:1px solid var(--line);border-radius:var(--r);padding:14px 15px;font-size:14px;
  line-height:1.68;white-space:pre-wrap;word-wrap:break-word;position:relative}
.output.streaming::after{content:'';display:inline-block;width:7px;height:15px;
  background:var(--brand);vertical-align:text-bottom;margin-left:2px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.metrics{display:flex;flex-wrap:wrap;gap:7px;margin-top:13px}
.metric{background:var(--bg-sunk);border:1px solid var(--line);border-radius:99px;
  padding:4px 11px;font-size:11.5px;color:var(--ink-2);font-family:var(--mono)}
.metric b{color:var(--ink);font-weight:600}

/* ============ tables ============ */
.table-wrap{overflow-x:auto;margin:0 -19px -19px;padding:0 19px}
.table{width:100%;border-collapse:collapse;font-size:13px;min-width:600px}
.table th{text-align:left;font-size:11px;font-weight:600;text-transform:uppercase;
  letter-spacing:.055em;color:var(--ink-3);padding:0 12px 9px;border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:11px 12px;border-bottom:1px solid var(--line-soft);vertical-align:middle}
.table tbody tr:last-child td{border-bottom:0}
.table tbody tr{transition:background .12s}
.table tbody tr:hover{background:var(--bg-sunk)}
.table code{font-family:var(--mono);font-size:11.5px;background:var(--bg-sunk);
  border:1px solid var(--line);padding:2px 6px;border-radius:5px}
.badge{display:inline-block;padding:2px 9px;border-radius:99px;font-size:11px;font-weight:550}
.badge.ok{background:var(--ok-soft);color:var(--ok)}
.badge.off{background:var(--bg-sunk);color:var(--ink-3)}
.badge.err{background:var(--err-soft);color:var(--err)}
.badge.warn{background:var(--warn-soft);color:var(--warn)}
.empty-row{text-align:center;color:var(--ink-3);padding:34px 0!important;font-size:13px}

/* ============ misc ============ */
.alert{padding:11px 14px;border-radius:var(--r);font-size:13px;margin-bottom:14px;
  border:1px solid transparent;line-height:1.5}
.alert.error{background:var(--err-soft);color:var(--err);border-color:color-mix(in srgb,var(--err) 26%,transparent)}
.alert.success{background:var(--ok-soft);color:var(--ok);border-color:color-mix(in srgb,var(--ok) 26%,transparent)}
.alert code{font-family:var(--mono);font-size:12px;word-break:break-all;display:block;
  margin-top:7px;background:rgba(0,0,0,.16);padding:8px 10px;border-radius:6px;color:var(--ink)}
.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(196px,1fr));gap:14px}
.settings-grid .field{margin:0}
.save-bar{display:flex;align-items:center;justify-content:flex-end;gap:14px;
  position:sticky;bottom:0;background:var(--bg);padding:14px 0;border-top:1px solid var(--line)}
.docs{font-size:13.5px;line-height:1.7}
.docs h4{margin:22px 0 8px;font-size:13.5px;font-weight:600}
.docs h4:first-child{margin-top:0}
.docs p{margin:0 0 10px;color:var(--ink-2)}
.docs pre{background:var(--bg-sunk);border:1px solid var(--line);border-radius:var(--r);
  padding:13px 15px;overflow-x:auto;font-family:var(--mono);font-size:12px;line-height:1.65;margin:0 0 14px}
.docs code{font-family:var(--mono);font-size:12.5px}
.docs table{width:100%;border-collapse:collapse;margin-bottom:14px;font-size:12.5px}
.docs th,.docs td{text-align:left;padding:7px 10px;border-bottom:1px solid var(--line-soft)}
.docs th{color:var(--ink-3);font-size:11px;text-transform:uppercase;letter-spacing:.05em}

.toast-host{position:fixed;bottom:22px;right:22px;z-index:100;display:flex;flex-direction:column;gap:9px}
.toast{background:var(--bg-elev);border:1px solid var(--line);border-left:3px solid var(--brand);
  border-radius:var(--r);padding:11px 16px;box-shadow:var(--shadow-lg);font-size:13px;
  min-width:210px;animation:slideIn .26s cubic-bezier(.2,.9,.3,1)}
.toast.ok{border-left-color:var(--ok)} .toast.err{border-left-color:var(--err)}
@keyframes slideIn{from{opacity:0;transform:translateX(22px)}to{opacity:1;transform:none}}

/* ============ responsive ============ */
@media(max-width:1080px){
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .panel-row,.pg-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  .shell{grid-template-columns:1fr}
  .sidebar{position:static;height:auto;flex-direction:row;align-items:center;padding:10px 13px;
    border-right:0;border-bottom:1px solid var(--line);overflow-x:auto;gap:14px}
  .side-brand{padding:0;white-space:nowrap}
  .side-nav{flex-direction:row;flex:1;gap:3px}
  .nav-item{white-space:nowrap;padding:7px 10px}
  .side-foot{border:0;padding:0;margin:0;display:flex;gap:9px;align-items:center}
  .status-chip{margin:0}.user-meta{display:none}
  .topbar,.view{padding-left:16px;padding-right:16px}
  .param-row{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ============ chat ============ */
.chat-view{padding:0;flex:1;min-height:0;overflow:hidden}
.chat-shell{display:grid;grid-template-columns:250px 1fr;height:100%;min-height:0}

/* conversation list */
.conv-pane{border-right:1px solid var(--line);padding:14px 11px;display:flex;flex-direction:column;
  gap:11px;min-height:0;background:var(--bg-elev)}
.conv-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;margin:0 -4px;padding:0 4px}
.conv-item{display:flex;align-items:center;gap:4px;padding:8px 8px 8px 10px;border-radius:var(--r);
  color:var(--ink-2);font-size:13px;cursor:pointer;transition:background .14s,color .14s}
.conv-item:hover{background:var(--bg-sunk);color:var(--ink)}
.conv-item.active{background:var(--brand-soft);color:var(--brand);font-weight:550}
[data-theme="dark"] .conv-item.active{color:var(--brand-2)}
.conv-item .t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ci-btn{opacity:0;flex:0 0 auto;background:none;border:0;color:var(--ink-3);cursor:pointer;
  width:22px;height:22px;border-radius:5px;display:grid;place-items:center;transition:.14s}
.conv-item:hover .ci-btn{opacity:1}
.ci-btn:hover{background:var(--line);color:var(--ink)}
.ci-btn.danger:hover{background:var(--err-soft);color:var(--err)}
.ci-btn svg{width:13px;height:13px}
.conv-empty{color:var(--ink-3);font-size:12.5px;text-align:center;padding:22px 8px}

/* main pane */
.chat-main{display:flex;flex-direction:column;min-height:0;min-width:0;position:relative}
.thread{flex:1;overflow-y:auto;padding:26px 26px 10px;display:flex;flex-direction:column;gap:22px}
.chat-empty{margin:auto;text-align:center;max-width:460px;padding:20px}
.chat-empty .logo-mark{margin:0 auto 15px}
.chat-empty h3{font-size:19px;margin-bottom:7px}
.chat-empty p{color:var(--ink-3);font-size:13.5px;margin:0 0 20px;line-height:1.6}
.suggest{display:flex;flex-wrap:wrap;gap:7px;justify-content:center}
.suggest button{padding:8px 13px;border-radius:var(--r);border:1px solid var(--line);
  background:var(--bg-elev);color:var(--ink-2);font:inherit;font-size:12.5px;cursor:pointer;transition:.15s}
.suggest button:hover{border-color:var(--brand);color:var(--ink);transform:translateY(-1px)}

/* messages */
.msg{display:flex;gap:13px;max-width:800px;width:100%;margin:0 auto;animation:fade .2s ease}
.msg .who{width:28px;height:28px;flex:0 0 28px;border-radius:8px;display:grid;place-items:center;
  font-size:10.5px;font-weight:600;margin-top:2px;letter-spacing:-.02em}
.msg.user .who{background:var(--bg-sunk);border:1px solid var(--line);color:var(--ink-3)}
.msg.bot .who{background:linear-gradient(140deg,var(--brand),var(--brand-2));color:#fff;font-size:13px}
.msg .col{flex:1;min-width:0}
.msg .body{font-size:14.5px;line-height:1.72}
.msg.user .body{color:var(--ink);white-space:pre-wrap;word-wrap:break-word}
.msg .body.typing::after{content:'';display:inline-block;width:7px;height:15px;background:var(--brand);
  vertical-align:text-bottom;margin-left:3px;animation:blink 1s steps(2) infinite}
.msg .meta{margin-top:5px;font-size:11px;color:var(--ink-3);font-family:var(--mono);opacity:.6;transition:.2s}
.msg:hover .meta{opacity:1}
.msg-imgs{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:9px}
.msg-imgs img{max-width:150px;max-height:150px;border-radius:var(--r);border:1px solid var(--line);
  display:block;object-fit:cover}
.msg-imgs a:hover img{border-color:var(--brand)}

/* per-message actions */
.msg-actions{display:flex;gap:4px;margin-top:9px;opacity:.72;transition:opacity .18s}
.msg:hover .msg-actions,.msg-actions:focus-within{opacity:1}
.ma-btn{display:inline-flex;align-items:center;gap:5px;padding:4px 9px;border-radius:7px;
  border:1px solid transparent;background:transparent;color:var(--ink-3);font:inherit;font-size:11.5px;
  cursor:pointer;transition:.14s}
.ma-btn:hover{background:var(--bg-sunk);border-color:var(--line);color:var(--ink)}
.ma-btn.done{color:var(--ok)}
.ma-btn svg{width:13px;height:13px}

/* markdown */
.md p{margin:0 0 11px} .md p:last-child{margin-bottom:0}
.md h1,.md h2,.md h3,.md h4,.md h5,.md h6{margin:16px 0 8px;font-size:15px;font-weight:600}
.md ul,.md ol{margin:0 0 11px;padding-left:22px}
.md li{margin-bottom:4px}
.md code{font-family:var(--mono);font-size:12.5px;background:var(--bg-sunk);
  border:1px solid var(--line);padding:1px 5px;border-radius:5px}
.md blockquote{margin:0 0 11px;padding-left:13px;border-left:3px solid var(--line);color:var(--ink-2)}
.md a{color:var(--brand);text-decoration:underline}
.md hr{border:0;border-top:1px solid var(--line);margin:15px 0}
.codeblock{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin:0 0 12px;
  background:var(--bg-sunk)}
.cb-head{display:flex;align-items:center;justify-content:space-between;padding:5px 8px 5px 12px;
  border-bottom:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--ink-3)}
.cb-copy{display:inline-flex;align-items:center;gap:5px;background:none;border:0;color:var(--ink-3);
  font:inherit;font-size:11px;cursor:pointer;padding:3px 7px;border-radius:6px;transition:.14s}
.cb-copy:hover{background:var(--line);color:var(--ink)}
.cb-copy.done{color:var(--ok)}
.cb-copy svg{width:12px;height:12px}
.codeblock pre{margin:0;padding:12px 14px;overflow-x:auto}
.codeblock pre code{background:none;border:0;padding:0;font-size:12.5px;line-height:1.62}

/* composer */
/* above the drop overlay, so attachments stay readable while dragging */
.composer{padding:10px 26px 12px;background:var(--bg);flex:0 0 auto;position:relative;z-index:35}
.composer-box{max-width:800px;margin:0 auto;background:var(--bg-elev);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:7px;transition:border-color .15s,box-shadow .15s}
.composer-box:focus-within{border-color:var(--brand);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 14%,transparent)}
.composer-row{display:flex;align-items:flex-end;gap:6px}
.composer-box textarea{flex:1;border:0;background:none;padding:7px 2px;resize:none;font-size:14.5px;
  line-height:1.55;min-height:38px;max-height:200px;overflow-y:auto;outline:none}
.composer-box textarea:focus{box-shadow:none;background:none;border:0}
.tool-btn{width:32px;height:32px;flex:0 0 32px;border-radius:8px;border:0;background:transparent;
  color:var(--ink-3);display:grid;place-items:center;cursor:pointer;transition:.15s}
.tool-btn:hover{background:var(--bg-sunk);color:var(--ink)}
.tool-btn svg{width:17px;height:17px}
.attach-count{font-size:11px;color:var(--ink-3);font-family:var(--mono);align-self:center}
.send-btn{width:32px;height:32px;flex:0 0 32px;border-radius:8px;border:0;background:var(--brand);
  color:#fff;display:grid;place-items:center;cursor:pointer;transition:.15s}
.send-btn:hover:not(:disabled){background:var(--brand-2)}
.send-btn:disabled{opacity:.35;cursor:not-allowed}
.send-btn.stop{background:var(--err)}
.send-btn svg{width:16px;height:16px}
.composer-hint{max-width:800px;margin:7px auto 0;font-size:11px;color:var(--ink-3);text-align:center}
.composer-hint kbd{font-family:var(--mono);background:var(--bg-sunk);border:1px solid var(--line);
  border-radius:4px;padding:1px 5px;font-size:10.5px}

/* attachments */
.attach-strip{display:flex;flex-wrap:wrap;gap:7px;padding:5px 5px 9px}
.thumb{position:relative;width:58px;height:58px;border-radius:9px;overflow:hidden;
  border:1px solid var(--line)}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb-x{position:absolute;top:2px;right:2px;width:18px;height:18px;border-radius:50%;border:0;
  background:rgba(0,0,0,.68);color:#fff;display:grid;place-items:center;cursor:pointer;padding:0}
.thumb-x svg{width:11px;height:11px}
.thumb-x:hover{background:var(--err)}

/* drag-drop overlay */
.drop-hint{position:absolute;inset:0;z-index:30;display:none;place-items:center;
  background:color-mix(in srgb,var(--bg) 62%,transparent);backdrop-filter:blur(1px)}
.chat-main.dragging .drop-hint{display:grid}
.drop-hint>div{display:flex;flex-direction:column;align-items:center;gap:11px;padding:30px 44px;
  border:2px dashed var(--brand);border-radius:var(--r-xl);background:var(--bg-elev);
  color:var(--brand);font-size:14px;font-weight:500}
.drop-hint svg{width:30px;height:30px}

/* jump to latest */
.scroll-fab{position:absolute;right:22px;bottom:112px;z-index:20;width:34px;height:34px;
  border-radius:50%;border:1px solid var(--line);background:var(--bg-elev);color:var(--ink-2);
  display:grid;place-items:center;cursor:pointer;box-shadow:var(--shadow-md);transition:.15s}
.scroll-fab:hover{color:var(--ink);border-color:var(--ink-3)}
.scroll-fab svg{width:16px;height:16px}

@media(max-width:860px){
  .chat-shell{grid-template-columns:1fr}
  .conv-pane{display:none}
  .thread,.composer{padding-left:14px;padding-right:14px}
}