/* YAML ↔ JSON 변환 전용 스타일 */

nav { max-width: 880px; }
main { max-width: 880px; }

.mode-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}

.mode-tab {
  padding: 0.45rem 1rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.83rem;
  font-weight: 500;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.mode-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.mode-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.options {
  margin-bottom: 0.85rem;
}

.opt-row {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.opt-row label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-sub);
}

.opt-row select {
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.opt-row select:focus {
  border-color: var(--primary);
}

.io-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
}

@media (min-width: 720px) {
  .io-grid {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
  }
}

.io-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.io-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.85rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.io-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-sub);
}

.io-btn {
  padding: 0.3rem 0.7rem;
  font-size: 0.75rem;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.io-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.io-block textarea {
  flex: 1;
  width: 100%;
  padding: 0.85rem 0.95rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  border: none;
  background: transparent;
  color: var(--text);
  resize: vertical;
  outline: none;
  min-height: 280px;
  white-space: pre;
  overflow-x: auto;
  tab-size: 2;
}
.io-block textarea[readonly] {
  cursor: text;
}

.swap-btn {
  align-self: center;
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px dashed var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  width: fit-content;
  margin: 0 auto;
}
.swap-btn:hover {
  border-style: solid;
  border-color: var(--primary);
  color: var(--primary);
}

@media (min-width: 720px) {
  .swap-btn {
    margin: auto 0;
  }
}

.error {
  padding: 0.75rem 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-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
  word-break: break-word;
}
.error[hidden] { display: none; }

@media (max-width: 480px) {
  .io-block textarea { font-size: 0.78rem; min-height: 240px; }
}