:root{
  --bg:#0f1115;--panel:#151a22;--accent:#5da7ff;--text:#e8edf3;--muted:#9aa6b2;
  --danger:#ff5d73;--ok:#28c76f;--border:#242b36;
}
*{box-sizing:border-box}
body{margin:0;padding:24px;background:radial-gradient(1000px 1000px at 80% -10%,#162032 0%,#0f1115 60%);
  color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Arial}
.card{background:linear-gradient(180deg,#151a22 0%,#11161e 100%);border:1px solid var(--border);
  border-radius:14px;padding:18px;margin:0 auto;max-width:980px;
  box-shadow:0 10px 30px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.02)}
.header{display:flex;align-items:center;margin-bottom:12px}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:56px;height:56px;border-radius:12px;border:1px solid var(--border)}
h1{font-size:1.35rem;margin:0;font-weight:650;letter-spacing:.2px}
.subtitle{color:var(--muted);margin-top:2px}
label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:6px}
input[type="text"],input[type="number"]{width:100%;padding:12px 12px;border-radius:10px;border:1px solid var(--border);
  background:#0e141b;color:var(--text);outline:none;font-size:.95rem;transition:border-color .2s, box-shadow .2s}
input[type="text"]:focus,input[type="number"]:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(93,167,255,.12)}
.btn{display:inline-block;background:#0d1a28;border:1px solid var(--border);color:var(--text);
  padding:8px 12px;border-radius:10px;font-weight:600;cursor:pointer}
.btn.small{margin-top:1px;font-size:.85rem}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin-bottom:12px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:12px}
@media (max-width: 900px){.grid-3,.grid-2,.grid-4{grid-template-columns:1fr}}
.help{font-size:.85rem;color:var(--muted);margin-top:4px}
.small{font-size:.84rem}
.slider-wrap{background:#0e141b;border:1px solid var(--border);border-radius:10px;padding:12px}
.slider-line{display:flex;align-items:center;gap:10px}
input[type="range"]{width:100%}
.pill{display:inline-block;min-width:74px;text-align:center;padding:6px 10px;border-radius:999px;background:#0d1a28;border:1px solid var(--border);
  color:var(--text);font-weight:600;font-size:.9rem}
.stat{padding:12px;border:1px solid var(--border);border-radius:10px;background:#0e141b}
.stat .k{font-size:.78rem;color:var(--muted)}
.stat .v{font-size:1.02rem;font-weight:650;margin-top:4px}
.foot{margin-top:4px;font-size:.86rem}
.err{color:var(--danger);font-weight:600}
.tip .k{display:flex;align-items:center;gap:8px}
.disclaimer{font-size:.78rem;color:var(--muted)}
.link{color:inherit !important; text-decoration: none;}
.linkb{color:inherit !important; text-decoration: none; font-weight: bolder;}
.price-box {
  position: relative;
  display: flex;
  align-items: center;
}

.price-box input {
  flex: 1;
  padding-right: 90px; /* espaço para o botão */
}

.price-box .btn.inside {
  position: absolute;
  right: 6px;
  height: 70%;
  padding: 0 10px;
  font-size: 0.85rem;
  background: #1a2432;
  border: 1px solid #2a3345;
  color: #e8edf3;
  border-radius: 8px;
  cursor: pointer;
}
.price-box .btn.inside:hover {
  background: #24334a;
}
/* table visuals (keeps original palette) */
.table-apr { width:100%; border-collapse:collapse; margin-top:20px; text-align:center; }
.table-apr th, .table-apr td { border:1px solid #242b36; padding:8px; }
.table-apr th { background:#1b2230; color:#e8edf3; }
.table-apr td { background:#0e141b; }

/* combobox styled to look like button */
select#cmbperiod {
  width:120px;
  background-color: #0f141b;      /* mesma cor de fundo do input */
  color: #e8edf3;                 /* mesma cor do texto */
  border: 1px solid #242b36;      /* mesma borda */
  border-radius: 8px;             /* arredondamento igual */
  padding: 10px 12px;             /* mesmo espaçamento interno */
  font-weight: bold;              /* texto em negrito */
  font-size: 0.9rem;              /* mesmo tamanho de fonte */
  height: 40px;                   /* mesma altura do input */
  line-height: normal;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  cursor: pointer;
}

/* add a little caret feel */
select#cmbperiod { background-image: linear-gradient(45deg, transparent 50%, #9aa6b2 50%), linear-gradient(135deg, #9aa6b2 50%, transparent 50%); background-position: calc(100% - 16px) 16px, calc(100% - 11px) 16px; background-size: 5px 5px, 5px 5px; background-repeat:no-repeat; }

/* push the Calculate button slightly to the right */
#btnCalc { margin-left: 10px; }