:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --bg-soft: #fafbfc;
  --fg: #1f2328;
  --fg-soft: #57606a;
  --border: #d0d7de;
  --border-soft: #e6e8eb;
  --accent: #0969da;
  --accent-soft: #ddf4ff;
  --error-bg: #fff5f5;
  --error-border: #f1b0b7;
  --error-fg: #86181d;
  --row-stripe: #fafbfc;
  --row-hover: #eef3fb;
  --header-bg: #f6f7f9;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand h1 {
  font-size: 15px;
  font-weight: 600;
  margin: 0;
}

.meta {
  flex: 1;
  color: var(--fg-soft);
  font-size: 13px;
}

.actions {
  display: flex;
  gap: 8px;
}

button {
  font: inherit;
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
button:hover { background: var(--bg-alt); }
button:active { background: var(--border-soft); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button:disabled { opacity: 0.5; cursor: default; }
button:disabled:hover { background: var(--bg); }

main {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.io-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 900px) {
  .io-grid { grid-template-columns: 1fr; }
}

.io-col {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  overflow: hidden;
  min-width: 0;
}

.io-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  gap: 12px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
}
.io-head label {
  font-weight: 600;
  font-size: 13px;
  color: var(--fg);
}
.io-tools {
  display: flex;
  gap: 6px;
  align-items: center;
}
.io-tools select {
  font: inherit;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
}

.io-col textarea {
  flex: 1;
  width: 100%;
  min-height: 260px;
  border: 0;
  outline: none;
  resize: vertical;
  padding: 12px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.45;
  background: var(--bg);
  color: var(--fg);
  tab-size: 2;
  white-space: pre;
}
.io-col textarea:focus {
  background: var(--bg);
  box-shadow: inset 0 0 0 2px var(--accent-soft);
}

.io-status {
  padding: 6px 12px;
  border-top: 1px solid var(--border-soft);
  background: var(--bg-soft);
  color: var(--fg-soft);
  font-size: 12px;
}
.io-status.ok    { color: #1a7f37; }
.io-status.error { color: var(--error-fg); background: var(--error-bg); }
.io-status.inline {
  border: 0;
  background: transparent;
  padding: 0;
}
@media (prefers-color-scheme: dark) {
  .io-status.ok { color: #56d364; }
}

.panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.preview-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
}
.preview-head h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
}
.preview-head .actions { margin-left: auto; }

.preview-empty {
  margin: 0;
  padding: 24px;
  text-align: center;
  color: var(--fg-soft);
  font-size: 13px;
}

.tableScroll {
  overflow: auto;
  max-height: 560px;
}

table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  font-variant-numeric: tabular-nums;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  text-align: left;
  padding: 8px 10px;
  font-weight: 600;
  font-size: 12px;
  color: var(--fg-soft);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
thead th:hover { background: var(--bg-alt); }
thead th .sort-indicator {
  display: inline-block;
  width: 10px;
  margin-left: 6px;
  color: var(--accent);
}

thead .filter-row th {
  position: sticky;
  top: 33px;
  z-index: 1;
  cursor: default;
  background: var(--bg-soft);
  padding: 4px 6px;
  border-bottom: 1px solid var(--border);
}
thead .filter-row input {
  width: 100%;
  padding: 4px 6px;
  font: inherit;
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
}
thead .filter-row input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

tbody td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
  font-size: 13px;
  max-width: 480px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
tbody tr:nth-child(even) td { background: var(--row-stripe); }
tbody tr:hover td { background: var(--row-hover); }

tbody td .cell-number { color: #0a3069; font-variant-numeric: tabular-nums; }
tbody td .cell-bool   { color: #6639ba; font-weight: 500; }
tbody td .cell-null   { color: var(--fg-soft); font-style: italic; }
tbody td .cell-string { color: var(--fg); }
tbody td .cell-empty  { color: var(--fg-soft); }
tbody td .cell-json   { font-family: var(--mono); font-size: 12px; color: #0a3069; }

.status {
  margin: 0;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--fg-soft);
  background: var(--bg-soft);
  border-top: 1px solid var(--border-soft);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-alt: #161b22;
    --bg-soft: #161b22;
    --fg: #e6edf3;
    --fg-soft: #8d96a0;
    --border: #30363d;
    --border-soft: #21262d;
    --accent: #58a6ff;
    --accent-soft: #1f3a5f;
    --error-bg: #2a1011;
    --error-border: #6e2327;
    --error-fg: #ffa198;
    --row-stripe: #11161d;
    --row-hover: #1a2230;
    --header-bg: #161b22;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
  tbody td .cell-number { color: #79c0ff; }
  tbody td .cell-bool   { color: #d2a8ff; }
  tbody td .cell-json   { color: #79c0ff; }
}