.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* 計算式レイアウト */
.calc-sentence {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.cs-label {
  font-size: 1rem;
  color: var(--text-sub);
  white-space: nowrap;
}
.cs-group {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.cs-group input[type="number"] {
  width: 120px;
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.cs-group input[type="number"]:focus { border-color: var(--blue); }
.cs-unit {
  font-size: 0.9rem;
  color: var(--text-sub);
  white-space: nowrap;
}
.cs-select-group select {
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}
.cs-select-group select:focus { border-color: var(--blue); }

/* 結果 */
.result-box {
  background: linear-gradient(135deg, #eff6ff, #f0fdf4);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 1.5rem;
  display: none;
}
.result-box.show { display: block; }
.result-label {
  font-size: 0.875rem;
  color: var(--text-sub);
  margin-bottom: 0.3rem;
  font-weight: 500;
}
.result-main {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 0.4rem;
}
.result-sub {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ダークモード */
html[data-theme="dark"] .result-box {
  background: linear-gradient(135deg, #1e3a5f, #0f2d1f);
  border-color: #1e40af;
}

@media (max-width: 540px) {
  .calc-sentence { gap: 0.5rem; }
  .cs-group input[type="number"] { width: 90px; }
  .tab-btn { font-size: 0.8rem; padding: 0.45rem 0.7rem; }
  .result-main { font-size: 1.75rem; }
}