/* Loop Chat — LoopXXI symmetric dark system */
:root{
  --bg:#050505; --panel:#0d0d0d; --panel2:#111111; --line:#1c1c1c;
  --text:#f2f2f2; --muted:#8a8a8a; --accent:#f7931a; --accent-dim:#b96f14;
  --radius:14px; --max:720px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:var(--bg); color:var(--text);
  font:15px/1.6 Inter,-apple-system,system-ui,sans-serif;
  display:flex; flex-direction:column; min-height:100vh;
}
a{color:var(--text)}
.hidden{display:none!important}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}

/* header */
.top{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 24px;border-bottom:1px solid var(--line);
  position:sticky;top:0;background:rgba(5,5,5,.85);backdrop-filter:blur(12px);z-index:20;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:17px;letter-spacing:-.02em}
.brand em{font-style:normal;color:var(--accent)}
.mark{width:22px;height:22px}
.top-actions{display:flex;gap:10px;align-items:center}
.pill{
  border:1px solid var(--line);border-radius:999px;padding:6px 14px;
  font-size:13px;color:var(--muted);background:var(--panel);
}
.pill b{color:var(--accent);font-weight:600}
.btn{
  background:var(--accent);color:#050505;font-weight:600;
  border-radius:10px;padding:10px 18px;transition:opacity .15s;
}
.btn:hover{opacity:.88}
.btn:disabled{opacity:.35;cursor:default}
.btn.small{padding:7px 14px;font-size:13px}
.btn.wide{width:100%;margin-top:16px}
.btn.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.btn.ghost:hover{color:var(--text)}
.linklike{color:var(--muted);font-size:14px;text-decoration:underline;text-underline-offset:3px}
.linklike:hover{color:var(--text)}
.linklike.small{font-size:13px}
.linklike.danger:hover{color:#e5534b}

/* welcome */
.welcome{flex:1;display:flex;flex-direction:column;align-items:center;padding:56px 24px 40px}
.hero{display:flex;flex-direction:column;align-items:center;text-align:center;max-width:640px}
.hero-ring{width:150px;height:150px;margin-bottom:32px}
.spin{transform-origin:100px 100px;animation:spin 14s linear infinite}
.spin.slow{animation-duration:22s}
.spin.rev{animation-direction:reverse}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spin{animation:none}}
h1{font-size:clamp(30px,5vw,44px);font-weight:700;letter-spacing:-.03em;line-height:1.15}
.sub{color:var(--muted);margin:16px 0 32px;font-size:16px}
.cta-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;width:100%;max-width:460px;margin-bottom:20px}
.cta{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);
  padding:18px 16px;display:flex;flex-direction:column;gap:4px;align-items:center;
  transition:border-color .15s,transform .15s;
}
.cta:hover{border-color:var(--accent);transform:translateY(-2px)}
.cta-title{font-weight:600;font-size:15px}
.cta-sub{color:var(--muted);font-size:13px}
.btc-cta .cta-sub{color:var(--accent)}

.props{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;
  max-width:860px;width:100%;margin-top:64px;
}
.prop{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);
  padding:26px 22px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px;
}
.prop svg{width:44px;height:44px}
.prop h3{font-size:15px;font-weight:600}
.prop p{color:var(--muted);font-size:13.5px}

/* chat */
.chat{flex:1;display:flex;flex-direction:column;width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.thread{flex:1;padding:28px 0 140px;display:flex;flex-direction:column;gap:18px}
.msg{max-width:88%;border-radius:var(--radius);padding:12px 16px;white-space:normal;word-wrap:break-word}
.msg.user{align-self:flex-end;background:var(--panel2);border:1px solid var(--line)}
.msg.ai{align-self:flex-start;background:transparent;padding-left:0}
.msg.ai .who{color:var(--accent);font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.msg pre{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px;overflow-x:auto;margin:10px 0;font-size:13px}
.msg code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;background:var(--panel);border-radius:5px;padding:1px 5px}
.msg pre code{background:none;padding:0}
.msg p{margin:8px 0}
.msg ul,.msg ol{margin:8px 0 8px 22px}
.msg .err{color:#e5534b}
.cursor{display:inline-block;width:8px;height:15px;background:var(--accent);vertical-align:-2px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

.composer-wrap{
  position:fixed;left:0;right:0;bottom:0;background:linear-gradient(transparent,var(--bg) 30%);
  padding:24px 20px 18px;display:flex;flex-direction:column;align-items:center;
}
.composer{
  width:100%;max-width:var(--max);display:flex;align-items:flex-end;gap:10px;
  background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:10px 10px 10px 18px;
}
.composer:focus-within{border-color:#333}
#input{
  flex:1;background:none;border:none;outline:none;color:var(--text);
  font:inherit;resize:none;max-height:180px;padding:6px 0;
}
.send{
  width:38px;height:38px;border-radius:10px;background:var(--accent);color:#050505;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.send svg{width:18px;height:18px}
.send:disabled{opacity:.35}
.composer-meta{
  width:100%;max-width:var(--max);display:flex;justify-content:space-between;align-items:center;
  padding:10px 4px 0;
}
.model-toggle{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.mt{padding:5px 14px;font-size:12.5px;color:var(--muted)}
.mt.on{background:var(--panel2);color:var(--text)}

/* modals */
.modal{
  position:fixed;inset:0;background:rgba(0,0,0,.65);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;z-index:50;padding:20px;
}
.sheet{
  background:var(--panel);border:1px solid var(--line);border-radius:18px;
  width:100%;max-width:420px;padding:28px;position:relative;max-height:90vh;overflow-y:auto;
}
.sheet h2{font-size:19px;letter-spacing:-.02em;margin-bottom:18px;text-align:center}
.x{position:absolute;top:12px;right:16px;font-size:22px;color:var(--muted)}
.x:hover{color:var(--text)}
.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:18px}
.tab{border:1px solid var(--line);border-radius:10px;padding:9px;color:var(--muted);font-weight:500}
.tab.on{border-color:var(--accent);color:var(--text)}
.packs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.pack{
  border:1px solid var(--line);border-radius:12px;padding:14px 8px;background:var(--panel2);
  display:flex;flex-direction:column;align-items:center;gap:2px;transition:border-color .15s;
}
.pack b{font-size:17px}
.pack span{color:var(--muted);font-size:12px}
.pack.on{border-color:var(--accent)}
.fine{color:var(--muted);font-size:12.5px;margin-top:12px;line-height:1.5}
.fine.center{text-align:center}
.invoice{margin-top:18px;display:flex;flex-direction:column;align-items:center}
.qr{background:#fff;border-radius:12px;padding:12px;margin-bottom:12px;line-height:0}
.qr svg{width:220px;height:220px}
.key-reveal{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}
.key-reveal code{
  display:block;background:var(--panel2);border:1px solid var(--line);border-radius:10px;
  padding:10px 12px;font-size:11.5px;word-break:break-all;margin:10px 0;
}
#keyInput{
  width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:10px;
  color:var(--text);padding:11px 14px;font:inherit;outline:none;margin-top:6px;
}
#keyInput:focus{border-color:#333}
#keyModal .linklike{display:block;margin:12px auto 0;text-align:center}

/* footer */
.foot{
  display:flex;justify-content:center;align-items:center;gap:10px;
  padding:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;
}
.foot a{color:var(--muted)}
.foot a:hover{color:var(--text)}
.dot{opacity:.5}

@media (max-width:720px){
  .props{grid-template-columns:1fr;max-width:420px}
  .cta-row{grid-template-columns:1fr}
  .msg{max-width:100%}
  .top{padding:12px 16px}
}