/* problem.css: ページ固有のスタイル（レイアウト、電卓、数値調整スピナー非表示など） */

.problem-grid-container {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 768px) {
  .problem-grid-container {
    grid-template-columns: 1fr;
  }
}

/* 小さめ電卓 */
.calc-panel {
  padding: 1rem;
  border: 1px solid var(--border-color);
  background: var(--header-bg);
}
.calc-title {
  font-family: 'Silkscreen', cursive;
  font-size: 0.8rem;
  color: var(--nav-link-color);
  margin: 0 0 0.75rem 0;
  text-align: center;
  letter-spacing: 0.05em;
}
.calc-display-box {
  width: 100%;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  margin-bottom: 0.5rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}
.calc-display-box:focus-within {
  border-color: var(--text-color);
}
.calc-katex-preview {
  min-height: 42px;
  padding: 0.4rem 0.6rem 0.2rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  overflow-x: auto;
  font-size: 1.15rem;
  color: var(--text-color);
  border-bottom: 1px dashed var(--border-color);
}
.calc-input-field {
  width: 100%;
  padding: 0.35rem 0.6rem;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.9rem;
  background: transparent;
  border: none;
  color: var(--nav-link-color);
  outline: none;
  box-sizing: border-box;
}
.calc-history {
  max-height: 110px;
  overflow-y: auto;
  margin-bottom: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.calc-history:empty {
  display: none;
}
.history-item {
  padding: 0.35rem 0.5rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  transition: all 0.1s;
}
.history-item:hover {
  border-color: var(--text-color);
  background: var(--btn-bg);
  color: var(--btn-text);
}
.calc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
}
.calc-btn {
  padding: 0.45rem 0;
  font-family: 'Silkscreen', 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.1s;
}
.calc-btn.op {
  color: var(--nav-link-color);
  font-weight: bold;
}
.calc-btn.eq {
  background: var(--btn-bg);
  color: var(--btn-text);
}
.calc-btn:hover, .calc-btn.op:hover {
  border-color: var(--text-color);
  background: var(--btn-bg);
  color: var(--btn-text);
}
.calc-btn.eq:hover {
  transform: translateY(1px);
}

/* 数値入力スピナー非表示 */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* 解答送信フォーム */
.problem-submit-form {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  box-sizing: border-box;
}
.submit-form-label {
  font-size: 0.9rem;
  font-weight: bold;
  letter-spacing: 0.05em;
  color: var(--text-color);
}
.submit-form-row {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  align-items: stretch;
}
.submit-form-input {
  flex: 1;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border-color);
  border-bottom: 3px solid var(--nav-link-color);
  background: var(--bg-color);
  color: var(--text-color);
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 1.2rem;
  box-sizing: border-box;
  transition: border-color 0.15s, background 0.15s;
}
.submit-form-input:focus {
  outline: none;
  border-color: var(--text-color);
  border-bottom: 3px solid var(--text-color);
  background: var(--btn-bg);
  color: var(--btn-text);
}
.submit-form-btn {
  padding: 0.65rem 2.2rem;
  cursor: pointer;
  border: none;
  font-size: 0.95rem;
  font-weight: bold;
}
.submit-form-feedback {
  font-size: 0.9rem;
  font-weight: bold;
  min-height: 1.4em;
}