/* 진법 변환기 전용 스타일 */

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

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.opt {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.83rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.opt input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.bases {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.base-row {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 0.55rem;
  align-items: center;
  padding: 0.65rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.base-label {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.base-hint {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-sub);
}

.base-row input[type="text"] {
  width: 100%;
  padding: 0.55rem 0.7rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  min-width: 0;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.base-row input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.copy-btn {
  flex-shrink: 0;
  padding: 0.4rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.error {
  margin-top: 0.85rem;
  padding: 0.7rem 0.95rem;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 8px;
  color: var(--error);
  font-size: 0.85rem;
}
.error[hidden] { display: none; }

@media (max-width: 600px) {
  .base-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  .base-label { flex-direction: row; align-items: baseline; gap: 0.45rem; }
  .copy-btn { justify-self: end; }
}

@media (max-width: 480px) {
  .base-row input[type="text"] { font-size: 0.85rem; min-height: 44px; }
  .opt { font-size: 0.78rem; }
}