:root {
  --bg: #1e1e1e;
  --fg: #fff;
  --card: #2a2a2a;
  --border: #444;
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  padding: 24px;
  margin: 0;
}

.container {
  width: 100%;
  max-width: 520px;
}

h1 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

label {
  display: block;
  margin-bottom: 4px;
  font-weight: bold;
}

input[type=number] {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  margin-bottom: 20px;
  appearance: auto;
  -webkit-appearance: auto;
}

/* --- iOS Safari: スピンボタンを強制表示 --- */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: inner-spin-button;
  opacity: 1;
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  font-size: 0.95rem;
}

th:first-child,
td:first-child {
  text-align: left;
}

th {
  background: #333;
}

/* --- モバイル調整 --- */
@media (max-width: 600px) {
  body {
    padding: 8px;
  }

  th, td {
    padding: 8px 6px;
    font-size: 0.85rem;
  }

  input[type=number] {
    padding: 8px;
    font-size: 0.95rem;
  }

  h1 {
    font-size: 1.1rem;
  }
}