/* 數字轉國字大寫 */
.tool { display: flex; flex-direction: column; gap: 18px; }
.lead { margin: 0; text-align: center; color: var(--muted); }
.panel { padding: 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.panel h2 { margin: 0 0 10px; font-size: 1.125rem; }

.tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.tab {
  min-height: 44px; padding: 8px 18px; font: inherit; font-weight: 700; color: var(--ink); background: var(--panel);
  border: 2px solid var(--line); border-radius: 999px; cursor: pointer;
}
.tab:hover, .tab:focus-visible { border-color: var(--accent); outline: none; }
.tab.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

.amount { display: flex; align-items: center; gap: 8px; }
.amount span { font-weight: 700; }
.amount input {
  flex: 1; min-width: 0; font: inherit; font-size: 1.5rem; padding: 10px 14px; text-align: right;
  border: 2px solid var(--accent); border-radius: 12px; background: var(--panel); color: var(--ink);
}
.hint { margin: 8px 0 0; color: var(--muted); font-size: .9375rem; }

.upper { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.upper-text { margin: 0; font-family: var(--font-serif, "Noto Serif TC", serif); font-size: 1.75rem; font-weight: 700; line-height: 1.5; overflow-wrap: anywhere; }
.copy {
  min-height: 44px; padding: 6px 16px; font: inherit; font-weight: 700; color: var(--ink); background: var(--panel);
  border: 2px solid var(--line); border-radius: 999px; cursor: pointer;
}
.copy:hover, .copy:focus-visible { border-color: var(--accent); outline: none; }
.copied { color: var(--accent); font-weight: 700; }

.grid-wrap { overflow-x: auto; }
table.boxes { border-collapse: collapse; width: 100%; min-width: 26rem; text-align: center; }
table.boxes th, table.boxes td { border: 1px solid var(--line); padding: 8px 4px; }
table.boxes thead th { background: var(--accent-soft); font-weight: 700; }
table.boxes tbody th { text-align: left; white-space: nowrap; padding-left: 10px; }
table.boxes td { font-family: var(--font-serif, "Noto Serif TC", serif); font-size: 1.25rem; }
table.boxes td.void { background: repeating-linear-gradient(135deg, transparent 0 6px, var(--line) 6px 7px); color: transparent; }
.error { color: #C0392B; font-weight: 700; margin: 0; }
.notes { margin: 0; padding-left: 1.25rem; color: var(--muted); }