:root {
--bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --text-main: #334155;
  --text-dim: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #e2e8f0;
  --result-bg: #f0f9ff;
  --result-text: #0369a1;
}

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

h1#title {
  font-size: 1.6rem;
  margin: 0 0 20px 0;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--accent);
}
h1#title span { font-size: 1rem; color: var(--text-dim); display: block; font-weight: normal; }

.main-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 20px;
}

@media (max-width: 850px) {
  .main-grid { grid-template-columns: 1fr; }
}

.card {
  border-radius: 8px;
  background: var(--card-bg);
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  margin-bottom: 20px;
}

.card-title {
  font-weight: bold;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

/* フォーム要素 */
.form-group {
  margin-bottom: 15px;
}

label {
  display: block;
  font-size: 1rem;
  margin-bottom: 5px;
  color: var(--text-dim);
}

label#sum {
  font-size:1.1rem;
  margin: 10px 0px 0px 0px;
  padding: 8px 0 8px 12px;
}

label#float_label {
  font-size: 1.1rem;
  margin:15px 0px 0px 20px;
}

label#hisukoha_label {
  font-size: 1.1rem;
  margin:0px 0px 0px 20px;
}

select, textarea {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 10px;
  border-radius: 6px;
  box-sizing: border-box;
  font-size: 1.1rem;
}

input[type="text"] {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 0px 10px;
  border-radius: 6px;
  box-sizing: border-box;
  font-size: 1rem;
  margin-top: 10px;
}

textarea {
  font-family: monospace;
  resize: vertical;
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.row > div { flex: 1; min-width: 120px; }

/* ボタン */
.btn-calc {
  background: var(--accent);
  color: white;
  border: none;
  padding: 8px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.2s;
  margin-top: 10px;
  font-size:1.1rem;
 }
 .btn-calc:hover { background: var(--accent-hover); }

 /* 技名リストなどの説明セクション */
 details {
   background: var(--card-bg);
   border: 1px solid var(--border);
   border-radius: 8px;
   margin-bottom: 10px;
 }

 summary {
   padding: 12px;
   cursor: pointer;
   font-weight: bold;
   user-select: none;
 }

 .details-content {
   padding: 0 30px 12px 30px;
   font-size: 1rem;
   line-height: 1.8rem;
   color: var(--text-dim);
 }

 dt { color: var(--accent); font-weight: bold; margin-top: 10px; }
 dd { margin-left: 1em; margin-bottom: 10px; }
 code { background: #f1f5f9; padding: 2px 5px; border-radius: 4px; color: #e11d48; }