/* 簡易計算機頁 — 需先載入 calculator/style.css、header2026.css、footer2026.css */

.page-simple-calc {
  min-height: 100vh;
}

.page-simple-calc .simple-main {
  padding: 1.5rem 1rem 2.5rem;
}

.page-simple-calc .simple-container {
  max-width: 480px;
  margin: 0 auto;
}

/* 計算機主卡片 */
.page-simple-calc .calc-machine {
  background: var(--surface);
  border-radius: 1rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-hover);
  overflow: hidden;
}

/* 顯示區 */
.page-simple-calc .display-section {
  background: var(--contrast);
  color: #fff;
  padding: 1.25rem 1.25rem 1rem;
}

.page-simple-calc .display-input {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.5rem;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.65rem;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1.15rem;
  text-align: right;
  min-height: 2.75rem;
  overflow-x: auto;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.page-simple-calc .display-result {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.5rem;
  padding: 0.85rem 1rem;
  color: #fff;
  font-size: 1.85rem;
  font-weight: 700;
  text-align: right;
  min-height: 3.25rem;
  overflow-x: auto;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.page-simple-calc .display-result.error {
  color: #fca5a5;
  font-size: 1.05rem;
  font-weight: 600;
}

/* 按鈕區 */
.page-simple-calc .buttons-section {
  padding: 1rem;
  background: var(--bg-panel);
}

.page-simple-calc .button-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
}

.page-simple-calc .calc-btn {
  min-height: 3.25rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1.35rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.12s, background 0.12s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}

.page-simple-calc .calc-btn:active {
  transform: scale(0.96);
}

.page-simple-calc .btn-number {
  background: var(--surface);
  color: var(--contrast);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.page-simple-calc .btn-number:hover {
  border-color: var(--border-hover);
  background: var(--brand-light);
}

.page-simple-calc .btn-operator {
  background: var(--btn-primary);
  color: #fff;
  border: 1px solid var(--brand-dark);
}

.page-simple-calc .btn-operator:hover {
  background: var(--brand-dark);
}

.page-simple-calc .btn-equal {
  background: #166534;
  color: #fff;
  grid-column: span 2;
  border: 1px solid #14532d;
}

.page-simple-calc .btn-equal:hover {
  background: #14532d;
}

.page-simple-calc .btn-clear {
  background: #b91c1c;
  color: #fff;
  border: 1px solid #991b1b;
}

.page-simple-calc .btn-clear:hover {
  background: #991b1b;
}

.page-simple-calc .btn-delete {
  background: #b45309;
  color: #fff;
  border: 1px solid #92400e;
}

.page-simple-calc .btn-delete:hover {
  background: #92400e;
}

/* 歷史 */
.page-simple-calc .history-section {
  background: var(--surface);
  padding: 1rem 1rem 1.1rem;
  max-height: 200px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
}

.page-simple-calc .history-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--contrast);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.page-simple-calc .clear-history {
  font-size: 0.8rem;
  color: var(--btn-primary);
  cursor: pointer;
  padding: 0.2rem 0.45rem;
  border-radius: 0.25rem;
  transition: background 0.15s;
  white-space: nowrap;
}

.page-simple-calc .clear-history:hover {
  background: var(--brand-light);
}

.page-simple-calc .history-item {
  padding: 0.65rem 0.75rem;
  margin-bottom: 0.4rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.12s;
}

.page-simple-calc .history-item:hover {
  border-color: var(--btn-secondary);
  transform: translateX(3px);
}

.page-simple-calc .history-expression {
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.page-simple-calc .history-result {
  color: var(--btn-primary);
  font-weight: 600;
}

.page-simple-calc .history-empty {
  text-align: center;
  color: var(--text-hint);
  padding: 1.5rem 1rem;
  font-size: 0.9rem;
}

/* 使用說明 */
.page-simple-calc .info-box {
  background: var(--surface);
  border-radius: 1rem;
  padding: 1.5rem 1.35rem;
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.page-simple-calc .info-box h3 {
  font-size: 1.25rem;
  color: var(--btn-primary);
  margin-bottom: 0.85rem;
}

.page-simple-calc .info-box h4 {
  font-size: 1.05rem;
  color: var(--contrast);
  margin: 1.25rem 0 0.6rem;
}

.page-simple-calc .info-box ul {
  list-style: none;
  padding-left: 0;
}

.page-simple-calc .info-box li {
  padding: 0.35rem 0;
  line-height: 1.65;
  color: var(--text);
}

.page-simple-calc .info-box strong {
  color: var(--btn-primary);
}

.page-simple-calc .tip-box {
  background: var(--brand-light);
  border-left: 4px solid var(--btn-secondary);
  padding: 1rem;
  border-radius: 0.45rem;
  margin: 1rem 0;
}

.page-simple-calc .tip-box p {
  margin: 0.35rem 0;
  line-height: 1.6;
  color: var(--text);
}

.page-simple-calc .shortcut-table {
  width: 100%;
  margin: 0.75rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-simple-calc .shortcut-table th,
.page-simple-calc .shortcut-table td {
  padding: 0.55rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.page-simple-calc .shortcut-table th {
  background: var(--bg-panel);
  font-weight: 600;
  color: var(--contrast);
}

.page-simple-calc .shortcut-table kbd {
  background: var(--contrast);
  color: #fff;
  padding: 0.15rem 0.4rem;
  border-radius: 0.2rem;
  font-family: ui-monospace, monospace;
  font-size: 0.82rem;
}

.page-simple-calc .history-section::-webkit-scrollbar {
  width: 6px;
}

.page-simple-calc .history-section::-webkit-scrollbar-track {
  background: var(--bg-sub);
}

.page-simple-calc .history-section::-webkit-scrollbar-thumb {
  background: var(--btn-tertiary);
  border-radius: 3px;
}

@media (min-width: 768px) {
  .page-simple-calc .simple-main {
    padding: 2rem 1.5rem 3rem;
  }

  .page-simple-calc .simple-container {
    max-width: 520px;
  }

  .page-simple-calc .calc-btn {
    min-height: 3.6rem;
    font-size: 1.5rem;
  }

  .page-simple-calc .display-input {
    font-size: 1.35rem;
  }

  .page-simple-calc .display-result {
    font-size: 2.1rem;
  }
}

@media (max-width: 767px) {
  .page-simple-calc .button-grid {
    gap: 0.35rem;
  }

  .page-simple-calc .calc-btn {
    min-height: 2.85rem;
    font-size: 1.2rem;
  }
}