:root {
  --bg: #0f1014;
  --panel: #181c24;
  --panel-2: #1f2530;
  --border: #2a3140;
  --fg: #e6ecf2;
  --muted: #8b95a3;
  --accent: #7cc4ff;
  --accent-dim: #4a7aa8;
  --good: #7cffa1;
  --good-bg: rgba(124, 255, 161, 0.1);
  --bad: #ff7c8a;
  --bad-bg: rgba(255, 124, 138, 0.1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

code {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  background: var(--panel);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.88em;
}

a { color: var(--accent); }

header {
  max-width: 1080px;
  margin: 28px auto 16px;
  padding: 0 20px;
}

h1 {
  margin: 0 0 6px;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 .arrow {
  color: var(--accent);
  font-weight: 400;
  margin: 0 8px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 76ch;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.panel-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.io-panel {
  display: flex;
  flex-direction: column;
}

#schemaIn, #outputIn, .prompt-out, .example-out {
  width: 100%;
  flex: 1;
  background: #0c0e13;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  outline: none;
  min-height: 240px;
  resize: vertical;
  white-space: pre-wrap;
  overflow: auto;
  margin: 0;
}

#schemaIn:focus, #outputIn:focus { border-color: var(--accent); }

.example-out {
  min-height: auto;
  max-height: 220px;
}

.schema-error {
  margin-top: 8px;
  color: var(--bad);
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.85rem;
  padding: 6px 10px;
  background: var(--bad-bg);
  border-radius: 4px;
}

.copy {
  margin-top: 10px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  align-self: flex-start;
}

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

/* ── Validation result ── */

.valid-result {
  display: flex;
  flex-direction: column;
  min-height: 240px;
}

.valid-empty {
  color: var(--muted);
  font-size: 0.92rem;
  padding: 16px 0;
}

.valid-good, .valid-bad {
  border-radius: 6px;
  padding: 14px 16px;
}

.valid-good { background: var(--good-bg); border: 1px solid rgba(124, 255, 161, 0.3); }
.valid-bad  { background: var(--bad-bg);  border: 1px solid rgba(255, 124, 138, 0.3); }

.valid-head {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.valid-good .valid-head { color: var(--good); }
.valid-bad .valid-head  { color: var(--bad); }

.valid-detail {
  color: var(--muted);
  font-size: 0.88rem;
}

.valid-list {
  margin: 8px 0 0;
  padding-left: 20px;
  color: var(--fg);
  font-size: 0.88rem;
}

.valid-list li {
  margin-bottom: 4px;
}

.valid-list code {
  background: rgba(255, 124, 138, 0.18);
  color: var(--bad);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.85em;
}

/* ── Presets ── */

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.preset {
  background: var(--panel-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}

.preset:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Notes ── */

.notes-panel ul {
  margin: 0;
  padding-left: 18px;
}

.notes-panel li {
  margin-bottom: 6px;
}

footer {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
  line-height: 1.6;
}

footer code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.8rem;
}

@media (max-width: 720px) {
  .panel-row { grid-template-columns: 1fr; }
}