:root{
  --bg:#fbfaf5;        /* warm cream, almost white */
  --paper:#ffffff;
  --paper-2:#fdfcf7;
  --ink:#1d1d1f;
  --ink-2:#3a3a3c;
  --dim:#86868b;
  --hi:#f4f1e8;        /* warmer hover tint */
  /* lines: stronger, visible against cream */
  --line-strong:rgba(28,24,18,0.22);   /* panel separators (header, sidebar, turn divider) */
  --line:rgba(28,24,18,0.16);          /* control borders, cards */
  --line-2:rgba(28,24,18,0.10);        /* subtle inline dividers */
  --accent:#1d1d1f;
  --err:#b53a2c;
  --ok:#2e7d4f;
  --send:#1d1d1f;
  --shadow-sm:0 1px 2px rgba(60,50,40,.05);
  --shadow-md:0 1px 2px rgba(60,50,40,.05), 0 8px 24px rgba(60,50,40,.07);
  --shadow-lg:0 1px 2px rgba(60,50,40,.05), 0 20px 48px rgba(60,50,40,.11);
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "JetBrains Mono", "Roboto Mono", monospace;
  --dock-h: 132px;
  --side-w: 256px;
  --hdr-h: 56px;
}

/* force-light: never auto-dark */
:root, html, body { color-scheme: light; }

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{padding-bottom:calc(var(--dock-h) + env(safe-area-inset-bottom));min-height:100vh}
a{color:inherit;text-decoration:none}
button{font-family:inherit;font-size:inherit;background:none;border:0;cursor:pointer;color:inherit;padding:0}
textarea,select,input{font-family:inherit;font-size:inherit;color:inherit}
::selection{background:rgba(46,125,79,.16)}

/* ======= header ======= */
.hdr{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;gap:14px;
  padding:10px 22px;
  height:var(--hdr-h);
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom:1px solid var(--line-strong);
}
.brand{display:flex;align-items:center;gap:8px;font-weight:600;letter-spacing:-.014em;font-size:15px}
.brand .mark{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:6px;background:var(--ink);color:var(--bg);font-size:14px;line-height:1}
.brand .bn{color:var(--ink)}
.meta{margin-left:auto;display:flex;align-items:center;gap:8px}
#model-select,#image-select,#video-select{
  appearance:none;-webkit-appearance:none;
  padding:7px 28px 7px 12px;border:1px solid var(--line);border-radius:10px;background:var(--paper);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'><path d='M3 4.5l3 3 3-3' stroke='%2386868b' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat:no-repeat;background-position:right 8px center;
  font-size:13px;color:var(--ink-2);max-width:240px;letter-spacing:-.005em;
  box-shadow:var(--shadow-sm);
}
.iconbtn{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:10px;color:var(--ink-2);background:var(--paper);
  border:1px solid var(--line);box-shadow:var(--shadow-sm);transition:background .15s, color .15s;
}
.iconbtn:hover{background:var(--hi);color:var(--ink)}
#side-toggle{display:none}

/* ======= layout: sidebar + main ======= */
.shell{display:flex;align-items:flex-start;gap:0;min-height:calc(100vh - var(--hdr-h))}

/* ======= sidebar ======= */
.sidebar{
  position:sticky;top:var(--hdr-h);
  width:var(--side-w);flex-shrink:0;
  height:calc(100vh - var(--hdr-h));
  border-right:1px solid var(--line-strong);
  background:var(--paper-2);
  display:flex;flex-direction:column;
  padding:0;
}
.sb-head{padding:14px 14px 8px;display:flex;align-items:center;gap:8px}
.sb-head .sb-mode{
  flex:1;display:flex;align-items:center;gap:6px;
  font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--dim);font-weight:500;
}
.sb-head .sb-mode strong{color:var(--ink);font-weight:600;letter-spacing:0;text-transform:none}
.sb-head .sb-new{
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:8px;background:var(--ink);color:var(--bg);
  transition:opacity .15s, transform .12s;
}
.sb-head .sb-new:hover{opacity:.85}
.sb-head .sb-new:active{transform:scale(.96)}

.sb-list{flex:1;overflow-y:auto;padding:4px 8px 16px;display:flex;flex-direction:column;gap:2px}
.sb-list::-webkit-scrollbar{width:8px}
.sb-list::-webkit-scrollbar-thumb{background:var(--line);border-radius:8px}
.sb-section{font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--dim);padding:10px 8px 4px;font-weight:500}
.sb-section-row{display:flex;align-items:center;justify-content:space-between}
.sb-add{font-size:14px;line-height:1;color:var(--ink-2);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:0 7px;height:20px}
.sb-add:hover{background:var(--ink);color:var(--bg)}

.sb-item{
  position:relative;display:block;padding:8px 10px;border-radius:8px;
  font-size:13.5px;color:var(--ink-2);line-height:1.35;cursor:pointer;
  transition:background .12s;
}
.sb-item:hover{background:var(--hi)}
.sb-item.active{background:var(--hi);color:var(--ink)}
.sb-item .sb-title{display:block;letter-spacing:-.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-right:18px;font-family:var(--mono);font-size:13px}
.sb-item .sb-meta{font-size:10.5px;color:var(--dim);margin-top:2px;font-family:var(--mono);letter-spacing:-.005em}
.sb-item .sb-pin{position:absolute;right:6px;top:8px;font-size:11px;color:var(--dim);opacity:0;transition:opacity .15s}
.sb-item:hover .sb-pin, .sb-item.pinned .sb-pin{opacity:1}
.sb-item.pinned .sb-pin{color:var(--ink)}
.sb-item .sb-menu-btn{position:absolute;right:6px;bottom:6px;width:18px;height:18px;border-radius:4px;color:var(--dim);opacity:0;display:inline-flex;align-items:center;justify-content:center}
.sb-item:hover .sb-menu-btn{opacity:1}
.sb-item .sb-menu-btn:hover{background:var(--paper);color:var(--ink)}

.sb-edit{display:flex;width:100%;background:transparent;border:1px solid var(--line);border-radius:6px;padding:5px 7px;font-size:13.5px;color:var(--ink);outline:none}
.sb-edit:focus{border-color:var(--ink)}

.sb-empty{padding:24px 16px;color:var(--dim);font-size:12.5px;text-align:center;line-height:1.5}

/* context menu */
.ctxmenu{
  position:fixed;z-index:80;background:var(--paper);border:1px solid var(--line);
  border-radius:10px;box-shadow:var(--shadow-lg);padding:4px;min-width:160px;
  display:flex;flex-direction:column;gap:0;
}
.ctxmenu button{
  text-align:left;padding:7px 10px;font-size:13px;color:var(--ink);border-radius:6px;
}
.ctxmenu button:hover{background:var(--hi)}
.ctxmenu button.danger{color:var(--err)}

/* ======= main column ======= */
.main{flex:1;min-width:0;max-width:880px;margin:0 auto;padding:24px 24px 8px}

.welcome{display:flex;flex-direction:column;align-items:center;gap:14px;padding:11vh 0 30px;text-align:center}
.welcome h1{font-size:clamp(28px, 4.5vw, 44px);font-weight:600;letter-spacing:-.028em;margin:0;color:var(--ink);max-width:640px}
.welcome .sub{margin:0;color:var(--dim);max-width:520px;font-size:14px;font-family:var(--mono);letter-spacing:-.01em}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin-top:32px;width:100%;max-width:760px}
.card{
  display:flex;align-items:center;
  padding:14px 16px;text-align:left;min-height:64px;
  background:var(--paper);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow-sm);transition:transform .12s ease, box-shadow .15s ease, border-color .15s;
}
.card:hover{box-shadow:var(--shadow-md);border-color:var(--line-strong);transform:translateY(-1px)}
.card .ct{font-size:13.5px;color:var(--ink);letter-spacing:-.005em;line-height:1.45;font-family:var(--mono)}

/* ======= thread ======= */
.thread{display:flex;flex-direction:column;gap:36px;padding-top:8px}
.turn{display:flex;flex-direction:column;gap:14px}
.turn + .turn{border-top:1px solid var(--line-strong);padding-top:28px}

.qline{display:flex;align-items:flex-start}
.qtext{flex:1;font-size:clamp(20px, 2.4vw, 26px);font-weight:600;letter-spacing:-.018em;line-height:1.3;color:var(--ink);white-space:pre-wrap}

.aline{display:flex;flex-direction:column;gap:14px}
.meta-row{display:flex;gap:10px;align-items:center;font-size:11px;letter-spacing:.04em;color:var(--dim);flex-wrap:wrap}
.alabel{font-weight:500;text-transform:uppercase}
.dim{color:var(--dim)}
.cached{color:var(--ok)}

.trace{
  display:flex;flex-direction:column;gap:5px;font-size:12.5px;color:var(--dim);
  background:var(--paper);border:1px solid var(--line-2);border-radius:12px;padding:12px 14px;
  max-height:300px;overflow:auto;font-family:var(--mono);
}
.trace .step{display:flex;gap:10px;align-items:flex-start;line-height:1.5}
.trace .step b{color:var(--ink);min-width:84px;text-transform:uppercase;font-size:10.5px;font-weight:600;letter-spacing:.05em;padding-top:1px;font-family:var(--sans)}
.trace .step .body{flex:1;word-break:break-word}
.trace.collapsed{max-height:60px}
.toggle{margin-top:6px;color:var(--ink-2);font-size:11px;letter-spacing:.04em;cursor:pointer;border:1px solid var(--line);background:var(--paper);padding:4px 9px;border-radius:8px;align-self:flex-start;font-family:var(--sans)}
.toggle:hover{background:var(--hi)}

.answer{font-size:14.5px;line-height:1.7;color:var(--ink-2);font-family:var(--mono);letter-spacing:-.005em}
.answer h2{font-size:18px;margin:22px 0 8px;font-weight:600;letter-spacing:-.012em;color:var(--ink);font-family:var(--sans)}
.answer h3{font-size:13px;margin:16px 0 6px;color:var(--dim);text-transform:uppercase;letter-spacing:.06em;font-weight:500;font-family:var(--sans)}
.answer p{margin:0 0 10px}
.answer ul,.answer ol{padding-left:22px;margin:8px 0}
.answer li{margin:4px 0}
.answer code{background:var(--hi);padding:2px 6px;border-radius:5px;font-size:13.5px;font-family:var(--mono)}
.answer pre{
  background:var(--ink);color:#fff;padding:14px 16px;border-radius:12px;overflow:auto;
  font-family:var(--mono);font-size:13px;position:relative;line-height:1.55;
  box-shadow:var(--shadow-sm);
}
.answer pre code{background:transparent;color:#fff;padding:0;font-size:inherit}
.answer pre .copy{position:absolute;top:10px;right:10px;font-size:10.5px;letter-spacing:.04em;background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.14);padding:4px 9px;border-radius:7px;cursor:pointer;font-family:var(--sans);font-weight:500;text-transform:uppercase}
.answer pre .copy:hover{background:rgba(255,255,255,.16)}
.answer blockquote{border-left:3px solid var(--line);margin:0;padding:6px 14px;color:var(--dim)}
.answer a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line)}
.answer a:hover{text-decoration-color:var(--ink)}
.answer sup.cite{font-size:10px;background:var(--hi);padding:1px 5px;border-radius:5px;margin-left:2px;cursor:pointer;color:var(--ink-2);font-family:var(--sans);font-weight:500}
.answer sup.cite:hover{background:var(--ink);color:var(--bg)}
.answer strong{font-weight:600;color:var(--ink)}

/* gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.gcard{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .12s, box-shadow .15s, border-color .15s;text-decoration:none;color:inherit}
.gcard:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.gthumb{width:100%;aspect-ratio:4/3;border:0;background:var(--hi);pointer-events:none}
.gmeta{display:flex;flex-direction:column;gap:3px;padding:10px 12px}
.gmeta .gkind{font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--dim);font-weight:500}
.gmeta .gtitle{font-size:13.5px;color:var(--ink);font-weight:500;line-height:1.35;letter-spacing:-.005em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.gmeta .gdim{font-size:11px;color:var(--dim);font-family:var(--mono);letter-spacing:-.005em}

/* computer-mode browser frame */
.cmp-frame{
  display:flex;flex-direction:column;
  background:var(--paper);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow-md);overflow:hidden;
}
.cmp-head{
  display:flex;align-items:center;gap:8px;
  padding:10px 14px;border-bottom:1px solid var(--line-2);
  background:var(--paper-2);
}
.cmp-dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.cmp-dot.r{background:#ed6a5e}
.cmp-dot.y{background:#f5bf4f}
.cmp-dot.g{background:#62c554}
.cmp-label{font-size:12px;color:var(--dim);letter-spacing:.02em;margin-left:6px}
.cmp-status{margin-left:auto;font-size:11px;color:var(--ok);letter-spacing:.04em;text-transform:uppercase;font-weight:500}
.cmp-tabs{
  display:flex;flex-direction:column;
  max-height:340px;overflow:auto;
  padding:8px;gap:6px;
}
.cmp-tab{
  display:flex;align-items:center;gap:10px;
  padding:9px 12px;border-radius:10px;background:var(--bg);
  border:1px solid var(--line-2);text-decoration:none;color:var(--ink);
  transition:background .12s, border-color .12s;
}
.cmp-tab:hover{background:var(--hi);border-color:var(--line)}
.cmp-fav{width:16px;height:16px;flex-shrink:0;border-radius:3px;background:var(--hi)}
.cmp-tt{flex:1;font-size:13.5px;letter-spacing:-.005em;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cmp-host{font-size:11.5px;color:var(--dim);font-family:var(--mono);flex-shrink:0}

/* deployed site headline (build) */
.deployed{
  display:flex;flex-direction:column;gap:6px;
  padding:16px 18px;background:var(--paper);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow-md);
}
.deployed .dl-label{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ok);font-weight:600}
.deployed .dl-url{font-size:18px;font-weight:600;letter-spacing:-.012em;color:var(--ink);text-decoration:none;word-break:break-all;line-height:1.3}
.deployed .dl-url:hover{text-decoration:underline;text-underline-offset:3px}
.deployed .dl-meta{display:flex;align-items:center;gap:12px;margin-top:6px;font-size:12px;color:var(--dim)}
.deployed .dl-meta .ctl{margin-left:auto;display:flex;gap:6px}
.deployed .dl-meta .btn{font-size:11px;border:1px solid var(--line);background:var(--bg);padding:5px 10px;border-radius:8px;color:var(--ink);cursor:pointer;letter-spacing:.02em;font-weight:500}
.deployed .dl-meta .btn:hover{background:var(--ink);color:var(--bg)}
.deployed .dl-files{margin-top:8px;font-size:12px}
.deployed .dl-files summary{cursor:pointer;color:var(--dim);letter-spacing:.04em;text-transform:uppercase;font-size:10.5px;font-weight:500}
.deployed .dl-files .fl{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-direction:column;gap:3px}
.deployed .dl-files .fl li{display:flex;justify-content:space-between;font-family:var(--mono);font-size:12px;color:var(--ink-2);padding:3px 0;border-bottom:1px solid var(--line-2)}
.deployed .dl-files .fl .fb{color:var(--dim)}

/* artifact */
.artifact{display:flex;flex-direction:column;gap:10px}
.artifact .abar{display:flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.04em;color:var(--dim)}
.artifact .abar .pill{background:var(--paper);border:1px solid var(--line);padding:4px 10px;border-radius:999px;text-transform:uppercase;font-weight:500}
.artifact .abar .ctl{margin-left:auto;display:flex;gap:6px}
.artifact .abar .btn{font-size:11px;border:1px solid var(--line);background:var(--paper);padding:5px 10px;border-radius:8px;color:var(--ink);cursor:pointer;letter-spacing:.04em;text-transform:uppercase;font-weight:500}
.artifact .abar .btn:hover{background:var(--ink);color:var(--bg)}
.artifact iframe{width:100%;min-height:520px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow-md)}
.artifact .imgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px}
.artifact .imgrid img{width:100%;height:auto;border-radius:14px;border:1px solid var(--line);background:var(--hi);object-fit:cover;aspect-ratio:1/1;box-shadow:var(--shadow-sm)}
.artifact video{width:100%;border:1px solid var(--line);border-radius:14px;background:#000;max-height:560px;box-shadow:var(--shadow-md)}
.vu{display:flex;flex-direction:column;gap:10px;padding:18px 20px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-sm)}
.vu-tag{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--err);font-weight:600}
.vu-msg{font-size:14px;color:var(--ink);font-family:var(--mono);letter-spacing:-.005em;line-height:1.5}
.vu-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
.vu-btn{display:inline-flex;align-items:center;padding:7px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);font-size:12.5px;color:var(--ink);text-decoration:none;letter-spacing:-.005em;font-weight:500;transition:background .12s, color .12s}
.vu-btn:hover{background:var(--ink-2);color:var(--bg)}
.vu-btn.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.vu-btn.primary:hover{opacity:.85}
.vu-detail{font-size:12.5px;color:var(--dim);font-family:var(--mono);margin-top:4px}
.vu-detail summary{cursor:pointer;letter-spacing:.04em;text-transform:uppercase;font-size:10.5px;font-weight:500;color:var(--ink-2)}
.vu-detail p{margin:8px 0 6px;line-height:1.5}
.vu-detail ul{margin:6px 0;padding-left:18px}
.vu-detail li{font-size:11.5px;line-height:1.5;color:var(--dim)}
.vu-detail code{background:var(--hi);padding:1px 5px;border-radius:4px;font-size:12px}

.sources{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.src{border:1px solid var(--line);background:var(--paper);padding:11px 12px;border-radius:12px;display:flex;flex-direction:column;gap:4px;font-size:12.5px;box-shadow:var(--shadow-sm);transition:transform .12s, box-shadow .15s;font-family:var(--mono)}
.src:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}
.src .sn{font-size:10.5px;color:var(--dim);letter-spacing:.02em}
.src .sd{font-weight:500;line-height:1.4;color:var(--ink);letter-spacing:-.01em}
.src .st{color:var(--dim);font-size:11.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.followups{display:flex;flex-direction:column;gap:6px;margin-top:6px;padding-top:14px;border-top:1px solid var(--line-2)}
.followup{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--paper);text-align:left;color:var(--ink-2);font-size:13.5px;cursor:pointer;transition:background .12s, border-color .12s;font-family:var(--mono);letter-spacing:-.005em}
.followup:hover{background:var(--hi);border-color:var(--line-strong)}

/* ======= dock (bottom) ======= */
.dock{
  position:fixed;left:var(--side-w);right:0;bottom:0;z-index:30;
  padding:8px 16px calc(12px + env(safe-area-inset-bottom));
  background:linear-gradient(to top, color-mix(in srgb, var(--bg) 96%, transparent) 60%, color-mix(in srgb, var(--bg) 0%, transparent));
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  backdrop-filter: saturate(180%) blur(24px);
  border-top:1px solid var(--line-strong);
}
.dock-inner{max-width:840px;margin:0 auto;display:flex;flex-direction:column;gap:8px}

/* primary mode segmented control: Chat / Create / Computer */
.modes{
  display:inline-flex;align-self:center;
  background:var(--paper-2);border:1px solid var(--line);border-radius:999px;
  padding:3px;gap:2px;
  box-shadow:var(--shadow-sm);
}
.mode{
  flex-shrink:0;padding:7px 18px;border-radius:999px;font-size:13px;font-weight:500;
  color:var(--dim);background:transparent;border:0;
  letter-spacing:-.005em;transition:background .15s, color .15s;
}
.mode:hover{color:var(--ink-2)}
.mode.on{color:var(--ink);background:var(--paper);box-shadow:var(--shadow-sm)}

/* secondary submode pills (Research/Code/... or Photo/Video/Audio) */
.submodes{display:flex;justify-content:center;gap:4px;flex-wrap:wrap;padding:2px 0}
.submode{
  padding:5px 12px;border-radius:999px;font-size:12px;color:var(--dim);
  background:transparent;border:1px solid transparent;letter-spacing:-.005em;
  transition:background .15s, color .15s, border-color .15s;
}
.submode:hover{color:var(--ink-2)}
.submode.on{color:var(--ink);background:var(--paper);border-color:var(--line)}

.cinema[hidden]{display:none}
.cinema{
  display:flex;flex-direction:column;gap:6px;
  padding:8px 12px;
  background:var(--paper-2);border:1px solid var(--line);border-radius:14px;
  margin-bottom:6px;
}
.submodes[hidden]{display:none}
.att-tray[hidden]{display:none}
.cn-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.cn-label{font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--dim);font-weight:500;margin-left:4px}
.cinema select{
  appearance:none;-webkit-appearance:none;
  padding:5px 22px 5px 9px;border:1px solid var(--line);border-radius:8px;background:var(--paper);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'><path d='M3 4.5l3 3 3-3' stroke='%2386868b' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat:no-repeat;background-position:right 6px center;
  font-size:12px;color:var(--ink-2);font-family:var(--mono);
}
.composer{
  display:flex;align-items:flex-end;gap:6px;flex-wrap:wrap;
  background:var(--paper);border:1px solid var(--line);border-radius:22px;
  padding:8px 8px 8px 12px;
  box-shadow:var(--shadow-md);
  transition:border-color .15s, box-shadow .15s, background .15s;
}
.composer:focus-within{border-color:rgba(28,24,18,.30);box-shadow:var(--shadow-lg)}
.composer.dragging{border-color:var(--ok);background:#f4faf6}
.att-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:18px;color:var(--ink-2);transition:background .12s, color .12s}
.att-btn:hover{background:var(--hi);color:var(--ink)}
.att-tray{display:flex;flex-wrap:wrap;gap:6px;width:100%;padding:4px 4px 0 4px;order:-1}
.att-chip{display:inline-flex;align-items:center;gap:6px;padding:4px 6px 4px 4px;background:var(--bg);border:1px solid var(--line);border-radius:8px;font-size:12px;font-family:var(--mono);max-width:240px}
.att-chip img{width:24px;height:24px;border-radius:5px;object-fit:cover;background:var(--hi)}
.att-chip .att-icon{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:5px;background:var(--hi);color:var(--ink-2)}
.att-chip .att-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink-2)}
.att-chip .att-rm{font-size:14px;line-height:1;padding:2px 4px;color:var(--dim);border-radius:4px}
.att-chip .att-rm:hover{background:var(--hi);color:var(--err)}
.composer textarea{
  flex:1;border:0;outline:0;resize:none;background:transparent;
  min-height:24px;max-height:200px;line-height:1.45;font-size:16px;
  padding:8px 0;letter-spacing:-.005em;color:var(--ink);
}
.composer textarea::placeholder{color:var(--dim)}
.send{
  display:inline-flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:18px;
  background:var(--send);color:var(--bg);transition:opacity .15s, transform .15s;
}
.send:hover{opacity:.85}
.send:active{transform:scale(.96)}
.send[disabled]{opacity:.35;cursor:not-allowed}

@keyframes pulse{0%,100%{opacity:.5}50%{opacity:1}}
.live{animation:pulse 1.4s ease-in-out infinite;color:var(--ink)}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}
.answer .caret{display:inline-block;animation:blink 1s steps(2) infinite;color:var(--ink);margin-left:1px;vertical-align:baseline;font-family:var(--mono)}

/* ======= mobile: collapse sidebar to drawer ======= */
@media (max-width:920px){
  .sidebar{
    position:fixed;left:0;top:var(--hdr-h);height:calc(100vh - var(--hdr-h));
    z-index:25;transform:translateX(-100%);transition:transform .22s ease;
    box-shadow:var(--shadow-lg);
  }
  .sidebar.open{transform:translateX(0)}
  .dock{left:0}
  #side-toggle{display:inline-flex}
}

@media (max-width:720px){
  .hdr{padding:8px 14px}
  #model-select{max-width:120px;font-size:12.5px}
  .meta{gap:6px}
  .main{padding:14px 16px 8px}
  .welcome{padding:6vh 0 20px}
  .cards{grid-template-columns:1fr 1fr}
  .qtext{font-size:19px}
  .answer{font-size:15px}
  .artifact iframe{min-height:380px}
  .dock{padding:8px 12px calc(10px + env(safe-area-inset-bottom))}
}