:root{
  --bg:#0F3E27;
  --panel:#11372a;
  --panel-2:#173f30;
  --accent:#b8c68b;
  --accent-2:#d8e0b5;
  --text:#f4f2ea;
  --muted:#cdd5b8;
  --bubble:#1d3e31;
  --bubble-user:#224b3d;
  --input:#16392c;
  --shadow:0 12px 36px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:linear-gradient(180deg,#0f3e27 0%, #0e3a2a 60%, #0b3325 100%);
  color:var(--text);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
.app{min-height:100%; display:flex; flex-direction:column}
.header{
  position:sticky; top:0; z-index:10; display:flex; align-items:center; gap:12px;
  padding:12px 16px; background:rgba(18,60,45,.7); backdrop-filter: blur(12px) saturate(120%);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.brand{display:flex; align-items:center; gap:10px}
.brand img{width:34px; height:34px; border-radius:8px; box-shadow:var(--shadow)}
.title{font-weight:700; letter-spacing:.5px}
.controls{margin-left:auto; display:flex; gap:8px; align-items:center}
.btn{
  background:var(--panel-2); color:var(--text); border:1px solid rgba(255,255,255,.08);
  padding:8px 12px; border-radius:12px; font-weight:600; cursor:pointer; transition:.2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn[aria-pressed="true"]{outline:2px solid rgba(184,198,139,.35)}
.main{flex:1; display:flex; justify-content:center}
.chat{width:min(1200px,100%); padding:20px; display:flex; flex-direction:column; gap:12px}
.msg{
  max-width:85ch; padding:12px 14px; border-radius:16px; box-shadow:var(--shadow); line-height:1.55;
}
.msg.ai{align-self:flex-start; background:var(--bubble)}
.msg.user{align-self:flex-end; background:var(--bubble-user)}
.inputbar{position:sticky; bottom:0; z-index:10; padding:14px 16px; background:linear-gradient(180deg,transparent, rgba(0,0,0,.35))}
.inputwrap{display:flex; gap:10px; align-items:center; background:var(--input); border:1px solid rgba(255,255,255,.08);
  border-radius:16px; padding:8px}
input[type=text]{flex:1; background:transparent; border:0; color:var(--text); font-size:16px; padding:8px}
.iconbtn{width:42px; height:42px; border-radius:12px; border:1px solid rgba(255,255,255,.08); background:var(--panel); color:var(--text); cursor:pointer}
.footer{opacity:.7; text-align:center; padding:12px 0 20px}
.small{font-size:12px; color:var(--muted)}
.settings{position:fixed; inset:0; display:none; place-items:center; background:rgba(0,0,0,.5)}
.settings .panel{background:var(--panel); padding:18px; border-radius:14px; width:min(560px,90vw); box-shadow:var(--shadow)}
.settings label{display:block; margin:10px 0 4px; color:var(--accent-2)}
.settings input, .settings select, .settings textarea{width:100%; background:#102e24; color:var(--text); border:1px solid rgba(255,255,255,.12); border-radius:10px; padding:8px}
.settings .row{display:flex; gap:10px}
.settings .row > *{flex:1}
.toggle{display:inline-flex; align-items:center; gap:8px}
.toggle input{accent-color:#9fb67e}