:root{
  --bg:#0b1220;
  --text:#e6eefc;
  --muted:#9fb0d0;
  --accent:#4aa3ff;
  --accent2:#7c5cff;
  --danger:#ff4a6a;
  --border:rgba(255,255,255,.08);
  --shadow: 0 18px 60px rgba(0,0,0,.55);
  --radius: 18px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:var(--sans);
  background:
    radial-gradient(1200px 700px at 15% 15%, rgba(74,163,255,.18), transparent 55%),
    radial-gradient(900px 600px at 85% 25%, rgba(124,92,255,.18), transparent 60%),
    radial-gradient(900px 600px at 70% 90%, rgba(255,74,106,.10), transparent 60%),
    var(--bg);
  color:var(--text);
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px;
}
.shell{
  width:min(1180px, 100%);
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:18px;
}
@media (max-width: 980px){ .shell{grid-template-columns:1fr;} }

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.02));
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 18px;
  background:linear-gradient(90deg, rgba(74,163,255,.12), rgba(124,92,255,.10));
  border-bottom:1px solid var(--border);
  gap:12px; flex-wrap:wrap;
}
.brand{display:flex; gap:10px; align-items:center;}
.logo{
  width:34px;height:34px;border-radius:12px;
  background: conic-gradient(from 210deg, var(--accent), var(--accent2), var(--danger), var(--accent));
  box-shadow: 0 10px 26px rgba(74,163,255,.18);
}
.brand h1{font-size:15px;margin:0; letter-spacing:.2px;}
.brand p{margin:0; font-size:12px; color:var(--muted);}
.controls{display:flex; gap:10px; align-items:center; flex-wrap:wrap;}

.seg{
  display:flex; flex-wrap:wrap;
  background: rgba(0,0,0,.18);
  border:1px solid var(--border);
  border-radius:14px;
  padding:3px;
  gap:3px;
}
.seg button{
  border:0;
  padding:8px 10px;
  border-radius:11px;
  background:transparent;
  color:var(--muted);
  cursor:pointer;
  font-size:12px;
  transition:.15s ease;
  white-space:nowrap;
}
.seg button.active{background:rgba(255,255,255,.10); color:var(--text);}

.pill{
  border:1px solid var(--border);
  background:rgba(0,0,0,.18);
  color:var(--muted);
  padding:8px 10px;
  border-radius:14px;
  font-size:12px;
  cursor:pointer;
  transition:.15s ease;
  white-space:nowrap;
}
.pill:hover{color:var(--text); border-color:rgba(255,255,255,.14)}

.main{
  padding:18px;
  display:grid;
  grid-template-rows:auto auto 1fr;
  gap:14px;
  background:linear-gradient(180deg, rgba(0,0,0,.10), rgba(0,0,0,0));
}

.display{
  background: rgba(0,0,0,.22);
  border:1px solid var(--border);
  border-radius:16px;
  padding:14px 14px 12px;
}
.expr{
  font-family:var(--mono);
  width:100%;
  background:transparent;
  border:0;
  outline:none;
  color:var(--text);
  font-size:18px;
  letter-spacing:.2px;
}
.smallInput{
  border:1px solid var(--border);
  border-radius:12px;
  padding:8px 10px;
  background:rgba(255,255,255,.03);
  font-size:13px;
}

.result{
  margin-top:8px;
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:10px;
}
.val{ font-family:var(--mono); font-size:22px; color:#dff0ff; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.hint{ font-size:12px; color:var(--muted); white-space:nowrap; }

.block{ margin-top:12px; }
.row{ display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-top:10px; }
.subrow{display:flex; gap:10px; flex-wrap:wrap; align-items:center;}
.small{font-size:12px; color:var(--muted);}
.warn{color:#ffd7de;}
.mono{font-family:var(--mono);}

.pad{ display:grid; grid-template-columns: repeat(4, 1fr); gap:10px; }
.pad.wide{ grid-template-columns: repeat(6, 1fr); }

.btn{
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border:1px solid var(--border);
  color:var(--text);
  border-radius:14px;
  padding:12px 10px;
  font-size:14px;
  cursor:pointer;
  transition:.12s ease;
  user-select:none;
}
.btn:hover{ transform: translateY(-1px); border-color:rgba(255,255,255,.14); }
.btn:active{ transform: translateY(0px); opacity:.92; }
.btn.op{ background: linear-gradient(180deg, rgba(74,163,255,.10), rgba(74,163,255,.04)); }
.btn.eq{ background: linear-gradient(180deg, rgba(124,92,255,.16), rgba(124,92,255,.06)); border-color: rgba(124,92,255,.25); }
.btn.danger{ background: linear-gradient(180deg, rgba(255,74,106,.16), rgba(255,74,106,.06)); border-color: rgba(255,74,106,.25); }
.btn.wide2{ grid-column: span 2; }

.kbd{
  font-family:var(--mono);
  border:1px solid var(--border);
  padding:1px 6px;
  border-radius:8px;
  background:rgba(0,0,0,.18);
  color:var(--text);
  font-size:11px;
}

.grid2{ display:grid; grid-template-columns: 1fr 1fr; gap:10px; margin-top:10px; }
.mini{
  border:1px solid var(--border);
  border-radius:14px;
  background:rgba(255,255,255,.03);
  padding:10px;
}
.mini .k{font-size:11px; color:var(--muted); margin-bottom:6px;}
.mini .v{font-family:var(--mono); font-size:13px; color:var(--text); overflow:auto;}

.plot{
  width:100%;
  height:auto;
  border:1px solid var(--border);
  border-radius:14px;
  background:rgba(255,255,255,.02);
}

.side{padding:18px; display:flex; flex-direction:column; gap:12px;}
.panel{
  background:rgba(0,0,0,.18);
  border:1px solid var(--border);
  border-radius:16px;
  padding:12px;
}
.panel h2{margin:0 0 6px; font-size:13px; letter-spacing:.2px;}
.panel p{margin:0; color:var(--muted); font-size:12px; line-height:1.35;}

.tiles{ display:grid; grid-template-columns: repeat(2, 1fr); gap:10px; margin-top:10px; }
.tile{
  border:1px solid var(--border);
  border-radius:14px;
  padding:10px;
  background:rgba(255,255,255,.03);
  cursor:pointer;
  transition:.12s ease;
}
.tile:hover{ border-color: rgba(255,255,255,.14); transform: translateY(-1px); }
.tile .t{ font-size:13px; }
.tile .d{ font-size:11px; color:var(--muted); margin-top:6px; line-height:1.3; }

.chips{ display:flex; flex-wrap:wrap; gap:8px; margin-top:10px; }
.chip{
  border:1px solid var(--border);
  border-radius:999px;
  padding:7px 10px;
  background:rgba(255,255,255,.03);
  font-size:12px;
  color:var(--text);
  cursor:pointer;
  transition:.12s ease;
}
.chip:hover{ border-color: rgba(255,255,255,.14); }

.form{ margin-top:10px; display:grid; gap:10px; }
.form label{ display:grid; gap:6px; color:var(--muted); font-size:12px; }
.form input, .form select{
  border:1px solid var(--border);
  border-radius:12px;
  padding:8px 10px;
  background:rgba(255,255,255,.03);
  color:var(--text);
  font-family:var(--mono);
}
.rowInline{ display:flex; gap:8px; align-items:center; }

.history{
  margin-top:10px;
  display:flex; flex-direction:column; gap:8px;
  max-height: 320px; overflow:auto; padding-right:2px;
}
.item{
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  border-radius:14px;
  padding:10px;
  cursor:pointer;
  transition:.12s ease;
}
.item:hover{border-color:rgba(255,255,255,.14)}
.item .e{ font-family:var(--mono); font-size:12px; color:var(--muted); }
.item .r{ font-family:var(--mono); font-size:14px; color:var(--text); margin-top:6px; }

.footer{
  padding:12px 18px;
  border-top:1px solid var(--border);
  display:flex;
  justify-content:space-between;
  gap:10px;
  flex-wrap:wrap;
  color:var(--muted);
  font-size:12px;
  background: rgba(0,0,0,.12);
}
.footer a{ color:var(--muted); text-decoration:none; }
.footer a:hover{ color:var(--text); }