:root{--bg:#faf9f5;--surface:#ffffff;--side:#f3f1ea;--text:#1f1f1f;--muted:#5f6368;--line:#e6e2d8;--accent:#c96a3a;--link:#a44f22;--accent-soft:#f7e9df;--user:#f1efe8;--ok:#2f8f5b;--bad:#c0392b;--code-bg:#f1efe8;--pre-bg:#1f1f1f;--pre-text:#eeeeee;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;--serif:Georgia,"Times New Roman",serif}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#17181a;--surface:#1f2124;--side:#1b1d1f;--text:#eceff1;--muted:#a8b0b8;--line:#2e3236;--accent:#e08b5a;--link:#f0a97a;--accent-soft:#3a2418;--user:#26292d;--ok:#5fc98d;--bad:#f28b82;--code-bg:#26292d;--pre-bg:#0e0f11;--pre-text:#e6e6e6}}
:root[data-theme="dark"]{--bg:#17181a;--surface:#1f2124;--side:#1b1d1f;--text:#eceff1;--muted:#a8b0b8;--line:#2e3236;--accent:#e08b5a;--link:#f0a97a;--accent-soft:#3a2418;--user:#26292d;--ok:#5fc98d;--bad:#f28b82;--code-bg:#26292d;--pre-bg:#0e0f11;--pre-text:#e6e6e6}
*{box-sizing:border-box}html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--link)}button{font-family:inherit;cursor:pointer}.hidden{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}
.wordmark{display:flex;align-items:center;gap:8px;font-family:var(--serif);font-size:22px;font-weight:700;letter-spacing:.2px}
a.wordmark{color:inherit;text-decoration:none}
a.wordmark:hover .mark{filter:brightness(1.08)}
.wordmark.big{font-size:30px;justify-content:center}
.mark{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-size:17px;font-family:var(--serif)}
.wordmark.big .mark{width:40px;height:40px;font-size:22px}
.btn{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:10px;padding:10px 16px;font-size:15px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}.btn.primary:hover{filter:brightness(.95)}
.icon{background:none;border:1px solid var(--line);color:var(--muted);border-radius:8px;width:30px;height:30px;font-size:18px;line-height:1}

/* gate */
.gate{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}
.gate-card{width:100%;max-width:420px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:34px 30px;text-align:center}
.lead{color:var(--muted);margin:10px 0 22px}
#gateForm{display:flex;gap:8px}#gateForm input{flex:1;border:1px solid var(--line);border-radius:10px;padding:11px 13px;font:inherit;background:var(--bg)}
#gateForm input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.error{color:var(--bad);font-size:14px;min-height:20px;margin:10px 0 0}
.small{font-size:12.5px;color:var(--muted);line-height:1.5;margin:14px 0 0}

/* layout */
#app{display:flex;height:100vh;overflow:hidden}
#sidebar{width:250px;background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:16px 12px;gap:10px;transition:margin .2s}
#sidebar.collapsed{margin-left:-250px}
.side-top{display:flex;align-items:center;justify-content:space-between;padding:0 4px}
.btn.new{text-align:left;background:var(--surface)}
.side-label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.6px;padding:8px 6px 0}
#recents{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px}
.recent{display:flex;align-items:center;gap:6px;padding:8px 10px;border-radius:8px;font-size:14.5px;cursor:pointer;white-space:nowrap;overflow:hidden}
.recent:hover{background:rgba(0,0,0,.05)}.recent.active{background:var(--surface);border:1px solid var(--line)}
.recent{position:relative}.recent span{flex:1;overflow:hidden;text-overflow:ellipsis}
.recent .more{opacity:0;background:none;border:none;color:var(--muted);font-size:16px;line-height:1;padding:0 4px;border-radius:6px}.recent:hover .more,.recent.active .more{opacity:1}.recent .more:hover{background:rgba(0,0,0,.08)}
.pop{position:absolute;right:6px;top:34px;z-index:30;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 6px 20px rgba(0,0,0,.12);padding:4px;min-width:130px;display:flex;flex-direction:column}
.pop button{background:none;border:none;text-align:left;padding:8px 10px;border-radius:7px;font-size:14px;color:var(--text)}.pop button:hover{background:var(--side)}.pop button.danger{color:var(--bad)}
input.rename{flex:1;font:inherit;font-size:14px;border:1px solid var(--accent);border-radius:6px;padding:3px 6px;background:var(--surface);color:var(--text);min-width:0}
#title{cursor:text}#title:hover{text-decoration:underline dotted var(--muted)}
.side-foot{font-size:12px;color:var(--muted);padding:8px 6px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:8px}
.linkish{background:none;border:none;padding:0;font:inherit;color:var(--muted);cursor:pointer;text-decoration:underline;text-underline-offset:2px}
.linkish:hover{color:var(--ink)}
#main{flex:1;display:flex;flex-direction:column;min-width:0}
#topbar{display:flex;align-items:center;gap:10px;padding:12px 18px;border-bottom:1px solid var(--line);font-weight:600;background:var(--bg)}
#showSide{display:none}#sidebar.collapsed~#main #showSide{display:inline-block}
.status{font-size:12px;color:var(--muted);font-weight:400;margin-left:10px}
#scroll{flex:1;overflow-y:auto;padding:26px 0}
.thread,.empty{max-width:760px;margin:0 auto;padding:0 22px}
.empty h1{font-family:var(--serif);font-weight:600;font-size:34px;margin:40px 0 8px;text-align:center}
.empty p{color:var(--muted);text-align:center;max-width:560px;margin:0 auto 26px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}
.card{text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14px;line-height:1.45;color:var(--text)}.card:hover{border-color:var(--accent)}
.card-tag{display:block;font-size:12px;font-weight:600;color:var(--muted);margin-bottom:4px;letter-spacing:.01em}

/* messages */
.msg{display:flex;gap:14px;margin:0 0 26px}
.msg.user{justify-content:flex-end}.msg.user .bubble{background:var(--user);border-radius:16px;padding:11px 16px;max-width:85%;white-space:pre-wrap}
.msg.assistant .avatar{flex:none;width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-weight:700;font-size:14px;margin-top:4px}
.msg.assistant .body{flex:1;min-width:0}
.md p{margin:0 0 12px}.md h1,.md h2,.md h3{margin:18px 0 8px;line-height:1.3;font-family:var(--serif);font-weight:600}.md h1{font-size:24px}.md h2{font-size:20px}.md h3{font-size:17px}
.md ul,.md ol{margin:0 0 12px 22px}.md li{margin:3px 0}
.md code{background:var(--code-bg);border:1px solid var(--line);padding:1px 5px;border-radius:5px;font-size:13.5px}
.md pre{background:var(--pre-bg);color:var(--pre-text);padding:12px 14px;border-radius:10px;overflow-x:auto;font-size:13px}.md pre code{background:none;border:none;color:inherit;padding:0}
.md table{border-collapse:collapse;margin:6px 0 14px;font-size:14px;display:block;overflow-x:auto}.md th,.md td{border:1px solid var(--line);padding:7px 11px;text-align:left}.md th{background:var(--side)}
.md hr{border:none;border-top:1px solid var(--line);margin:14px 0}.md blockquote{border-left:3px solid var(--accent);margin:8px 0;padding:2px 12px;color:var(--muted)}
.cursor::after{content:"▍";color:var(--accent)}
.tools{display:flex;flex-wrap:wrap;gap:6px;margin:2px 0 10px}
.chip{font-size:13px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 12px;color:var(--muted);display:inline-flex;align-items:center;gap:7px;max-width:100%;font-family:inherit;text-align:left}
.chip:hover{border-color:var(--accent)}
.chip .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);flex:none}.chip.running .dot{animation:pulse 1s infinite}.chip.done .dot{background:var(--ok)}.chip.error .dot{background:var(--bad)}
.chip b{color:var(--text);font-weight:600;flex:none}.chip .cd{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tooldetail{width:100%;background:var(--pre-bg);color:var(--pre-text);border-radius:10px;padding:12px 14px;font-size:12.5px;line-height:1.5;overflow-x:auto;margin:2px 0 0;white-space:pre-wrap;word-break:break-word}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}
.thinking{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:14px;margin:2px 0 10px}
.thinking .shimmer{width:14px;height:14px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--accent);animation:spin .8s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}
.chart{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:6px 0 16px}
.chart h4{margin:0 0 8px;font-size:14px;font-weight:600}.chart svg{width:100%;height:auto;display:block}
.chart .legend{display:flex;gap:16px;font-size:12.5px;color:var(--muted);margin-top:6px}.legend i{display:inline-block;width:14px;height:3px;border-radius:2px;margin-right:6px;vertical-align:middle}
.chart .stats{display:flex;flex-wrap:wrap;gap:16px;margin-top:8px;font-size:13px;color:var(--muted)}.chart .stats b{color:var(--text)}

/* composer */
#composer{padding:10px 22px 16px;background:var(--bg)}
.inputbox{position:relative;max-width:760px;margin:0 auto;display:flex;gap:8px;align-items:flex-end;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:10px 10px 10px 16px;box-shadow:0 2px 10px rgba(0,0,0,.04)}
.slash{position:absolute;bottom:calc(100% + 8px);left:0;right:0;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:0 10px 30px rgba(0,0,0,.10);overflow:hidden;z-index:40}
.slash.hidden{display:none}
.slash-item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:none;border:none;padding:10px 14px;font:inherit;font-size:14px;cursor:pointer;color:var(--text)}
.slash-item.sel,.slash-item:hover{background:var(--user)}
.si-e{width:22px;text-align:center}
.si-c{font-weight:600;min-width:86px}
.si-l{color:var(--muted);font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.inputbox:focus-within{border-color:var(--accent)}
#input{flex:1;resize:none;border:none;background:none;font:inherit;font-size:16px;line-height:1.5;outline:none;max-height:200px;padding:4px 0}
.sendbtn{width:38px;height:38px;border-radius:12px;border:none;background:var(--accent);color:#fff;font-size:18px;font-weight:700}.sendbtn:disabled{opacity:.35;cursor:default}
.sendbtn.stop{background:#1f1f1f;font-size:14px}
.foot{max-width:760px;margin:8px auto 0;text-align:center;font-size:12px;color:var(--muted)}
.queue{max-width:760px;margin:0 auto 8px;display:flex;flex-direction:column;gap:4px}
.qitem{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);background:var(--side);border:1px solid var(--line);border-radius:10px;padding:6px 10px}
.qitem b{color:var(--text);font-weight:600;font-size:12px}.qitem span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qitem button{background:none;border:none;color:var(--muted);font-size:16px}
.cost{margin-left:auto;font-size:13px;color:var(--muted);font-weight:500;font-variant-numeric:tabular-nums;white-space:nowrap}.cost b{color:var(--text)}
.usage{font-size:12.5px;color:var(--muted);margin:-4px 0 4px;font-variant-numeric:tabular-nums}
.stopped{font-size:12px;color:var(--muted);font-style:italic}
/* mobile helpers */
.mobile-only{display:none}
.backdrop{display:none}
.burger{display:block;width:16px;height:2px;background:currentColor;position:relative;margin:0 auto}.burger::before,.burger::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor}.burger::before{top:-5px}.burger::after{top:5px}
.tobottom{position:absolute;right:18px;bottom:118px;z-index:5;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--text);font-size:18px;box-shadow:0 4px 14px rgba(0,0,0,.12)}
#main{position:relative}
#scroll{overscroll-behavior:contain;-webkit-overflow-scrolling:touch}

@media (max-width:820px){
  #app{height:100dvh}
  /* sidebar becomes a slide-in drawer over a backdrop */
  #sidebar{position:fixed;z-index:40;top:0;left:0;height:100dvh;width:min(84vw,300px);margin:0;transform:translateX(-100%);transition:transform .22s ease;box-shadow:none;padding-top:calc(16px + env(safe-area-inset-top))}
  #sidebar.open{transform:translateX(0);box-shadow:0 0 40px rgba(0,0,0,.25)}
  #sidebar.collapsed{margin-left:0}
  #hideSide{display:none}
  .backdrop{display:block;position:fixed;inset:0;z-index:35;background:rgba(0,0,0,.35);opacity:0;pointer-events:none;transition:opacity .22s}
  .backdrop.show{opacity:1;pointer-events:auto}
  .recent{padding:12px 10px;font-size:15px}.recent .more{opacity:1;width:32px;height:32px}
  .btn.new{padding:12px 14px;font-size:15px}
  /* compact top bar */
  #topbar{padding:10px 10px;padding-top:calc(10px + env(safe-area-inset-top));gap:8px;position:sticky;top:0;z-index:10}
  #showSide{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;flex:none}
  .mobile-only{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;font-size:22px;flex:none}
  #title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:15px}
  .cost{font-size:12px;margin-left:0}.cost b{font-weight:600}.status{display:none}
  .cost .alltime{display:none}
  /* content */
  #scroll{padding:16px 0}
  .thread,.empty{padding:0 14px}
  .msg{gap:10px;margin-bottom:20px}.msg.user .bubble{max-width:92%;padding:10px 14px}
  .msg.assistant .avatar{width:24px;height:24px;font-size:12px}
  .md table{font-size:13px}.md pre{font-size:12.5px}
  .chart{padding:10px 10px}.chart .stats{gap:10px;font-size:12px}
  .empty h1{font-size:26px;margin-top:18px}.empty p{font-size:15px}
  .cards{grid-template-columns:1fr;gap:8px}.card{padding:12px 14px}
  /* composer hugs the bottom, clears the home indicator and the keyboard */
  #composer{padding:8px 10px calc(10px + env(safe-area-inset-bottom));position:sticky;bottom:0;background:var(--bg)}
  .inputbox{padding:8px 8px 8px 14px;border-radius:16px}
  #input{font-size:16px}      /* 16px prevents iOS focus zoom */
  .sendbtn{width:42px;height:42px}
  .foot{font-size:12px;margin-top:6px}#hint{display:none}
  .qitem{padding:8px 10px}.qitem button{width:32px;height:32px}
  .tobottom{bottom:calc(96px + env(safe-area-inset-bottom));right:12px}
  /* gate */
  .gate{padding:16px;align-items:flex-start;padding-top:calc(48px + env(safe-area-inset-top))}.gate-card{padding:28px 20px}
  #gateForm input{font-size:16px}
  .pop{top:40px}
}
@media (hover:none){.recent .more{opacity:1}}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}