* { box-sizing: border-box; }

:root {
  --bg: #0f1115;
  --card: #181b22;
  --card-2: #20242d;
  --border: #2a2f3a;
  --text: #e6e9ef;
  --muted: #8a93a3;
  --accent: #4f8cff;
  --accent-2: #21c08b;
  --danger: #ff6b6b;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

header .sub {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
}

.card h2 {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.grid {
  display: grid;
  gap: 12px;
  margin-bottom: 10px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 640px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input[type="number"] {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s, background .15s;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"]:focus {
  border-color: var(--accent);
  background: #1a2436;
}

input[readonly] {
  opacity: 0.85;
  color: var(--accent-2);
}

.hint {
  color: var(--muted);
  font-size: 12px;
  margin: 6px 0 0;
}

.results .result-block {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
}
.results .result-block:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.results h3 {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.kpi {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.kpi span {
  font-size: 12px;
  color: var(--muted);
}

.kpi strong {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.kpi.total strong {
  color: var(--accent-2);
}

footer {
  text-align: right;
  margin-top: 8px;
}

button#limpar {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 16px;
  font-size: 13px;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}

button#limpar:hover {
  color: var(--danger);
  border-color: var(--danger);
}