:root{--bg:#faf9f5;--side:#f0eee6;--card:#ffffff;--fg:#141413;--mut:#6b6a63;--line:#e3e0d5;--hover:#e8e5da;--accent:#c96442;--accent2:#b5563a;--err:#b3261e;--user:#efece2;--code:#f4f2ea;--shadow:0 2px 14px rgba(20,20,19,.07)}
@media(prefers-color-scheme:dark){:root{--bg:#262624;--side:#1f1e1d;--card:#30302e;--fg:#f3f1ea;--mut:#a3a199;--line:#3d3c39;--hover:#2d2c2a;--user:#3a3936;--code:#1c1b1a;--err:#ff8a80;--shadow:0 2px 14px rgba(0,0,0,.35)}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
input,textarea,select{font:inherit;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px;outline:none;width:100%}
input:focus,textarea:focus,select:focus{border-color:var(--accent)}
.primary{background:var(--accent);color:#fff;border-radius:10px;padding:10px 18px;font-weight:600}
.primary:hover{background:var(--accent2)}
.ghost{background:var(--hover);border-radius:10px;padding:9px 14px}
.ghost.danger{color:var(--err)}
.icon{width:34px;height:34px;border-radius:8px;color:var(--mut)}
.icon:hover{background:var(--hover);color:var(--fg)}
.err{color:var(--err);min-height:1.3em;margin:0;font-size:.9rem}
.logo{color:var(--accent);font-size:2.2rem;line-height:1}
.logo.sm{font-size:1.3rem}

.login{min-height:100%;display:grid;place-items:center;padding:20px}
.login-card{width:100%;max-width:360px;text-align:center;display:flex;flex-direction:column;gap:12px}
.login-card h1{font:500 2rem Georgia,"Times New Roman",serif;margin:6px 0 0}
.sub{color:var(--mut);margin:0 0 6px}

#app{display:flex;height:100%}
#sidebar{width:288px;background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:12px 10px;gap:8px;flex-shrink:0}
.side-top{display:flex;align-items:center;justify-content:space-between;padding:2px 6px}
.brand{display:flex;gap:8px;align-items:center;font:500 1.35rem Georgia,serif}
.newchat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px;text-align:left;font-weight:600;color:var(--accent);box-shadow:var(--shadow)}
.newchat:hover{border-color:var(--accent)}
.search{padding:8px 12px;font-size:.92rem;background:transparent}
.scroll{flex:1;overflow-y:auto;min-height:0}
.sec{display:flex;justify-content:space-between;align-items:center;font-size:.76rem;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);padding:12px 8px 4px}
.item{display:flex;align-items:center;gap:6px;padding:7px 10px;border-radius:9px;cursor:pointer;font-size:.93rem}
.item span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.item:hover,.item.active{background:var(--hover)}
.item .x{opacity:0;color:var(--mut);width:22px;height:22px;border-radius:6px}
.item:hover .x{opacity:1}.item .x:hover{background:var(--line);color:var(--err)}
@media(hover:none){.item .x{opacity:.6}}
.empty{color:var(--mut);font-size:.88rem;padding:4px 10px}
.profile{display:flex;align-items:center;gap:10px;padding:8px;border-radius:12px;text-align:left}
.profile:hover{background:var(--hover)}
.profile #pname{flex:1;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.gear{color:var(--mut)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700}

main{flex:1;display:flex;flex-direction:column;min-width:0;height:100%}
header{display:flex;align-items:center;gap:8px;padding:10px 14px;padding-top:calc(10px + env(safe-area-inset-top))}
.title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;color:var(--mut)}
header select{width:auto;max-width:48%;padding:7px 10px;font-size:.88rem;border-radius:10px}
#view{flex:1;overflow-y:auto;scroll-behavior:smooth}
.col{max-width:760px;margin:0 auto;padding:12px 18px 24px}

.hello{text-align:center;padding:12vh 12px 0}
.hello .logo{display:block;margin-bottom:10px}
.hello h2{font:400 clamp(1.7rem,5vw,2.4rem) Georgia,"Times New Roman",serif;margin:0}
.chips{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:22px}
.chip{border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:.9rem;color:var(--mut)}
.chip:hover{border-color:var(--accent);color:var(--fg)}

.msg{margin:18px 0}
.msg.user{display:flex;justify-content:flex-end}
.msg.user .bubble{background:var(--user);border-radius:18px;padding:10px 16px;max-width:85%;white-space:pre-wrap;overflow-wrap:anywhere}
.msg.assistant{display:flex;gap:12px}
.msg.assistant .mark{color:var(--accent);font-size:1.25rem;line-height:1.5;flex-shrink:0}
.msg.assistant .body{min-width:0;flex:1}
.msg .tools{display:flex;gap:4px;margin-top:6px;opacity:.7}
.tools button{font-size:.8rem;color:var(--mut);padding:3px 8px;border-radius:8px}
.tools button:hover{background:var(--hover);color:var(--fg)}
.md p{margin:.55em 0}.md h1,.md h2,.md h3,.md h4{font-family:Georgia,serif;font-weight:600;margin:1em 0 .3em;line-height:1.3}
.md ul,.md ol{padding-left:1.4em;margin:.5em 0}.md li{margin:.2em 0}
.md a{color:var(--accent)}
.md code{background:var(--code);border-radius:6px;padding:.1em .35em;font:.88em ui-monospace,Menlo,Consolas,monospace}
.md pre{background:var(--code);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:.8em 0}
.md pre code{display:block;padding:12px 14px;overflow-x:auto;background:none;white-space:pre;font-size:.86rem}
.codehead{display:flex;justify-content:space-between;align-items:center;padding:4px 10px 4px 14px;font-size:.76rem;color:var(--mut);border-bottom:1px solid var(--line)}
.copy{font-size:.76rem;color:var(--mut);padding:2px 8px;border-radius:6px}.copy:hover{background:var(--hover)}
.cursor::after{content:"●";color:var(--accent);margin-left:3px;animation:b 1s infinite}
@keyframes b{50%{opacity:.2}}
.msg.bad .body{color:var(--err)}

.composer-wrap{padding:6px 14px calc(10px + env(safe-area-inset-bottom))}
.composer{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:10px 12px 8px;box-shadow:var(--shadow)}
.composer:focus-within{border-color:var(--accent)}
.composer textarea{border:0;padding:4px 4px;resize:none;max-height:180px;background:transparent;border-radius:0}
.composer-row{display:flex;align-items:center;justify-content:space-between;margin-top:4px}
.ctx{font-size:.8rem;color:var(--mut);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-left:4px}
.sendbtn{width:36px;height:36px;border-radius:10px;background:var(--accent);color:#fff;font-weight:700;font-size:1.1rem;flex-shrink:0}
.sendbtn.stop{background:var(--fg);color:var(--bg)}
.fine{text-align:center;font-size:.74rem;color:var(--mut);margin:6px 0 0}

.proj h2{font:500 1.7rem Georgia,serif;margin:10px 0 4px}
.proj label{display:block;font-size:.85rem;color:var(--mut);margin:16px 0 6px}
.proj .row{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.proj .item{border:1px solid var(--line);margin-top:6px;background:var(--card)}

dialog{border:0;border-radius:18px;background:var(--bg);color:var(--fg);padding:0;width:min(520px,calc(100vw - 24px));box-shadow:0 20px 60px rgba(0,0,0,.35)}
dialog::backdrop{background:rgba(0,0,0,.45)}
.dlg{padding:22px;display:flex;flex-direction:column;gap:14px}
.dlg h2{margin:0;font:500 1.5rem Georgia,serif}
.dlg label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:var(--mut)}
.row{display:flex;gap:8px;flex-wrap:wrap}.row.end{justify-content:space-between}
.note{font-size:.78rem;color:var(--mut);margin:0}

#scrim{display:none}
.only-mobile{display:none}
@media(max-width:800px){
  .only-mobile{display:inline-block}
  #sidebar{position:fixed;inset:0 auto 0 0;z-index:20;transform:translateX(-100%);transition:transform .22s;width:min(86vw,320px);padding-top:calc(12px + env(safe-area-inset-top));padding-bottom:calc(12px + env(safe-area-inset-bottom))}
  #app.open #sidebar{transform:none}
  #app.open #scrim{display:block;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:10}
}