/* 단위 변환기 전용 스타일 */

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

.cat-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.cat-tab {
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-sub);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.cat-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.cat-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.convert-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.85rem;
  align-items: stretch;
  margin-bottom: 0.85rem;
}

.convert-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.95rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  min-width: 0;
}

.col-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-sub);
}

.convert-col select,
.convert-col input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  min-width: 0;
}
.convert-col select:focus,
.convert-col input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}
.convert-col input[type="text"][readonly] {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-weight: 600;
  color: var(--text);
  cursor: text;
}

.result-wrap {
  display: flex;
  gap: 0.4rem;
}
.result-wrap input { flex: 1; }
.copy-btn {
  flex-shrink: 0;
  padding: 0 0.85rem;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.swap-btn {
  align-self: center;
  width: 40px;
  height: 40px;
  font-size: 1.1rem;
  font-weight: 700;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px dashed var(--border);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.swap-btn:hover {
  border-style: solid;
  border-color: var(--primary);
  color: var(--primary);
  transform: rotate(180deg);
}

.hint {
  margin-top: 0.5rem;
  padding: 0.6rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-sub);
  text-align: center;
}

@media (max-width: 600px) {
  .convert-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .swap-btn {
    transform: rotate(90deg);
    margin: 0 auto;
  }
  .swap-btn:hover {
    transform: rotate(270deg);
  }
}

@media (max-width: 480px) {
  .cat-tab { padding: 0.4rem 0.7rem; font-size: 0.8rem; }
  .convert-col { padding: 0.8rem; }
  .convert-col select,
  .convert-col input[type="text"] { font-size: 0.9rem; min-height: 44px; }
}