:root{
  --bg:#0f172a;
  --card:#111827;
  --muted:#94a3b8;
  --accent:#22d3ee;
  --pos:#16a34a;
  --neg:#dc2626;
  --text:#e5e7eb;
}
*{box-sizing:border-box}
body{
  margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
  background:linear-gradient(120deg,#0b1222,#0f172a);
  color:var(--text);
  min-height:100svh;
}
header{ text-align:center; padding:28px 16px 8px;}
h1{ margin:0; font-size:28px; letter-spacing:0.5px; }
.subtitle{ margin:6px 0 0; color:var(--muted); }
main{ max-width:900px; margin:0 auto; padding:16px; }

.topbar{ display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:8px;}
.topbar .brand{ font-weight:800; letter-spacing:.3px; }
.topbar .lang{ display:flex; align-items:center; gap:8px; color:var(--muted); }
.topbar select{ padding:6px 10px; border-radius:8px; border:1px solid rgba(255,255,255,.1); background:#0b1222; color:var(--text); }

.code-box{
  background:rgba(17,24,39,.6);
  border:1px solid rgba(255,255,255,.08);
  border-radius:14px;
  padding:14px;
  display:grid; grid-template-columns:1fr auto auto; gap:8px; align-items:center;
}
.code-box label{ color:var(--muted); font-size:14px; grid-column:1/-1}
.code-box input{ width:100%; padding:10px 12px; border-radius:10px; border:1px solid rgba(255,255,255,.08); background:#0b1222; color:var(--text); }
button{
  padding:10px 14px; border-radius:10px; border:1px solid rgba(255,255,255,.1);
  background:#111827; color:var(--text); cursor:pointer;
}
button:hover{ border-color:rgba(255,255,255,.25); }
button.ghost{ background:transparent; }
button.small{ padding:6px 10px; font-size:12px; }
button.danger{ border-color:#ef4444; color:#fecaca; }
.hint{ grid-column:1/-1; color:var(--muted); }

.hidden{ display:none; }

.bar{ display:flex; justify-content:space-between; align-items:center; margin:16px 2px; }
.group-code{ color:var(--muted); }

.grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(140px,1fr));
  gap:12px;
}
.friend-card{
  background:rgba(17,24,39,.7);
  border:1px solid rgba(255,255,255,.08);
  border-radius:16px;
  padding:16px;
  display:flex; justify-content:space-between; align-items:end;
  min-height:84px;
}
.friend-card .name{ font-size:18px; font-weight:600; }
.friend-card .saldo{ font-size:28px; font-weight:700; }
.friend-card .saldo.pos{ color:var(--pos); }
.friend-card .saldo.neg{ color:var(--neg); }
.friend-card .saldo.zero{ color:var(--muted); }

.card{
  margin-top:14px;
  background:rgba(17,24,39,.7);
  border:1px solid rgba(255,255,255,.08);
  border-radius:16px;
  padding:16px;
}
.card h2, .card h3{ margin-top:0; }

.form-row{ margin:10px 0; display:grid; gap:8px;}
select, input[type="text"]{ padding:10px 12px; border-radius:10px; border:1px solid rgba(255,255,255,.1); background:#0b1222; color:var(--text); }

.chips{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px; border-radius:999px; border:1px solid rgba(255,255,255,.12);
  background:rgba(17,24,39,.5);
}
.chip input{ accent-color:var(--accent); }

.history ul{ list-style:none; padding:0; margin:0; }
.history li{ padding:6px 0; border-bottom:1px dashed rgba(255,255,255,.08); }
.history li:last-child{ border-bottom:0; }
.muted{ color:var(--muted); }

dialog{
  border:none; border-radius:14px; padding:0; background:#0b1222; color:var(--text);
  width:min(520px, 92vw);
}
dialog::backdrop{ background:rgba(0,0,0,.6); }
dialog form{ padding:16px; }
dialog .names{ display:grid; grid-template-columns:1fr 1fr; gap:8px; margin:10px 0 16px; }
menu{ display:flex; gap:8px; justify-content:flex-end; padding:0; margin:0; }
menu button{ min-width:100px; }

.toast{
  position:fixed; bottom:18px; left:50%; transform:translateX(-50%);
  background:#111827; border:1px solid rgba(255,255,255,.16);
  padding:10px 14px; border-radius:10px; opacity:.001; transition:opacity .2s ease, transform .2s ease; z-index:9999;
}
.toast.show{ opacity:1; transform:translateX(-50%) translateY(-6px); }

/* Footer */
.site-footer{
  margin-top:24px;
  background:rgba(17,24,39,.8);
  border-top:1px solid rgba(255,255,255,.08);
}
.site-footer .footer-inner{
  max-width:900px; margin:0 auto; padding:16px; display:grid; grid-template-columns:1fr 1fr 1fr; gap:12px;
}
.site-footer .brand{ font-weight:700; }
.site-footer a{ color:var(--text); opacity:.85; text-decoration:none; }
.site-footer a:hover{ opacity:1; text-decoration:underline; }
@media (max-width:720px){
  .site-footer .footer-inner{ grid-template-columns:1fr; }
}