/* 로마 숫자 변환기 전용 스타일 */

nav { max-width: 760px; }
main { max-width: 760px; }

.subtitle {
  color: var(--text-sub);
  margin-bottom: 1.25rem;
}

/* 변환 영역 */
.convert-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.85rem;
  align-items: center;
  margin-bottom: 0.85rem;
}

.conv-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.conv-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.conv-head label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.conv-range {
  font-size: 0.7rem;
  color: var(--text-sub);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

.conv-block input {
  padding: 0.7rem 0.9rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.4rem;
  font-weight: 800;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--primary);
  outline: none;
  text-align: center;
  width: 100%;
  box-sizing: border-box;
  letter-spacing: 0.05em;
}

.conv-block input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.copy-btn {
  padding: 0.4rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  align-self: flex-end;
}

.copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.conv-arrow {
  font-size: 1.5rem;
  color: var(--primary);
  text-align: center;
  font-weight: 800;
  user-select: none;
}

/* 에러 박스 */
.error-box {
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.3);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  font-size: 0.85rem;
  color: var(--error, #dc2626);
  margin-bottom: 1rem;
}

/* 참고 표 */
.ref-table {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 1.5rem;
}

.ref-title {
  margin: 0 0 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}

.ref-table table {
  width: 100%;
  border-collapse: collapse;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88rem;
}

.ref-table th, .ref-table td {
  padding: 0.4rem 0.7rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.ref-table th {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-sub);
  text-transform: uppercase;
}

.ref-table tbody tr:last-child td {
  border-bottom: none;
}

.ref-table tbody td:nth-child(2),
.ref-table tbody td:nth-child(4) {
  color: var(--primary);
  font-weight: 700;
}

@media (max-width: 600px) {
  .convert-grid {
    grid-template-columns: 1fr;
  }
  .conv-arrow {
    transform: rotate(90deg);
    font-size: 1.2rem;
  }
  .conv-block input { font-size: 1.2rem; }
}