:root {
  --bg: #f5f5f5;
  --card: #ddd;
  --ink: #000;
  --muted: #555;
  --extramuted: #777;
  --accent: #2d53fc;
  --warn: #fbbf24;
}

body {
  background-color: var(--bg);
  color: var(--ink);
  font-family: 'Nunito';
  margin: 0;
}

.header {
  margin-bottom:15px;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 12px;
}

p.hint {
  color: var(--muted);
  margin: 0 0 1rem;
  line-height: 1.4;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid #828496;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.card h2 {
  font-size: 1.1rem;
  color: var(--accent);
  margin-top: 0;
}

.card-left .form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
}

label {
  font-size: 0.9rem;
  color: var(--ink);
  align-self: center;
}

input, select {
  background: #ccc;
  color: var(--ink);
  border: 1px solid #aaa;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
}

input[type="text"],
input[type="number"] {
  box-sizing: border-box;
}

/* Hide spinners */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield;
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  background: #1f6feb;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn:hover {
  background: #2563eb;
}

.btn.primary {
  width: 100%;
  font-weight: 500;
  padding: 10px 0;
  margin-top: 10px;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.table-header,
.row-data {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr 1fr 0.7fr;
  gap: 6px;
  align-items: center;
}

.table-header {
  font-weight: bold;
  color: var(--accent);
  font-size: 0.9rem;
  border-bottom: 1px solid #26293d;
  padding-bottom: 6px;
  margin-bottom: 6px;
}

.row-data {
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.row-data input {
  text-align: center;
}

.card-output {
  grid-column: 1 / span 2;
}

.output-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.output-cell {
  background: var(--card);
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #26293d;
}

.output-cell .label {
  font-size: 0.85rem;
  color: var(--ink);
  margin-bottom: 4px;
}

.out {
  font-family: monospace;
  background: #bbb;
  border-radius: 8px;
  padding: 8px;
  border: 1px solid #aaa;
  font-size: 0.9rem;
}

.hr {
  border: 0;
  height: 1px;
  background: #26293d;
  margin: 12px 0;
}

.small {
  font-size: 0.85rem;
  color: var(--muted);
}

.footer {
  text-align: center;
  color: var(--extramuted);
  font-size: 0.85rem;
  margin-top: 30px;
  padding: 16px 0;
  border-top: 1px solid #26293d;
}

@media (max-width: 900px) {
  .grid {
    display: block;           /* forces vertical flow */
  }
  
.card {
    margin-bottom: 16px;      /* space between stacked cards */
  }  
  
}