:root {
  --accent: #6366f1;
  --accent-strong: #4f46e5;
  --accent-soft: #eef2ff;
  --emerald: #059669;
  --emerald-soft: #ecfdf5;
  --ink: #18181b;
  --muted: #71717a;
  --faint: #a1a1aa;
  --line: #e7e7ec;
  --line-soft: #f1f1f4;
  --bg: #fbfbfd;
  --surface: #ffffff;
  --bg-soft: #fafafb;
  --code-bg: #f5f5f7;
  --ok: #15803d;
  --err: #dc2626;
  --radius: 14px;
  --shadow-1:
    0 1px 2px rgba(24, 24, 27, 0.05), 0 2px 6px rgba(24, 24, 27, 0.06);
  --shadow-2: 0 6px 18px rgba(24, 24, 27, 0.09);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans:
    ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
}
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
/* faint accent wash behind the hero, never interactive */
body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto 0;
  height: 360px;
  background: radial-gradient(
    58% 100% at 50% 0%,
    rgba(99, 102, 241, 0.12),
    transparent 72%
  );
  pointer-events: none;
  z-index: 0;
}

/* top bar */
.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px clamp(16px, 5vw, 40px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(251, 251, 253, 0.8);
  backdrop-filter: saturate(180%) blur(10px);
  z-index: 10;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--ink);
}
.brand-name {
  font-weight: 650;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.brand-tag {
  color: var(--faint);
  font-size: 13px;
}
.toplinks {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.toplinks a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
}
.toplinks a:hover {
  color: var(--ink);
}
.link-btn {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  background: none;
  border: none;
  padding: 0;
  height: auto;
  cursor: pointer;
  border-radius: 0;
  transition: color 0.12s ease;
}
.link-btn:hover {
  color: var(--ink);
}

/* layout */
.wrap {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px clamp(16px, 5vw, 40px) 64px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.block {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-1);
}
.block-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.pill {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 9px;
  border-radius: 999px;
}
.pill.ghost {
  color: var(--muted);
  background: var(--line-soft);
}
.hint {
  margin-left: auto;
  color: var(--faint);
  font-size: 12px;
}
.presets {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 11px;
}
.presets-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--faint);
}
.preset {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 11px;
  height: auto;
  cursor: pointer;
  box-shadow: none;
  transition:
    color 0.12s ease,
    background 0.12s ease,
    border-color 0.12s ease;
}
.preset:hover {
  color: var(--accent-strong);
  background: var(--surface);
  border-color: #d7d7e0;
  box-shadow: none;
}
.preset.active {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--ink);
}

/* source editor (transparent textarea over a highlight layer) */
.editor {
  position: relative;
  height: 168px;
}
.editor .hl-layer,
.editor #input {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--code-bg);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}
.editor .hl-layer {
  color: #3f3f46;
  pointer-events: none;
  border-color: transparent;
  z-index: 0;
}
.editor #input {
  color: transparent;
  background: transparent;
  caret-color: var(--accent);
  resize: none;
  z-index: 1;
}
.editor #input::selection {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}
.editor #input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

select,
#facts {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}
select {
  margin-left: auto;
  padding: 5px 10px;
  cursor: pointer;
}
select:focus,
#facts:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.meta {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.facts {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 220px;
}
.facts label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--faint);
}
.feditor {
  position: relative;
  width: 100%;
  height: 112px;
}
.feditor .feditor-hl,
.feditor #facts {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--code-bg);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}
.feditor .feditor-hl {
  color: #3f3f46;
  pointer-events: none;
  border-color: transparent;
  z-index: 0;
}
.feditor #facts {
  color: transparent;
  background: transparent;
  caret-color: var(--accent);
  resize: none;
  z-index: 1;
}
.feditor #facts::selection {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}
.feditor #facts:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
button {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  padding: 9px 16px;
  cursor: pointer;
  height: 38px;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.28);
  transition:
    background 0.12s ease,
    box-shadow 0.12s ease;
}
button:hover {
  background: var(--accent-strong);
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.35);
}
.eval-out {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  min-width: 60px;
}
.eval-out.ok {
  color: var(--ok);
}
.eval-out.bad {
  color: var(--err);
}

/* converted targets */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(252px, 1fr));
  gap: 12px;
}
.out {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-1);
  transition:
    border-color 0.14s ease,
    box-shadow 0.14s ease,
    transform 0.14s ease;
}
.out:hover {
  border-color: #d7d7e0;
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}
.out-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.out-name {
  font-size: 12.5px;
  font-weight: 600;
}
.kind {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1px 7px;
  border-radius: 5px;
}
.kind.json {
  color: var(--accent-strong);
  background: var(--accent-soft);
}
.kind.expr {
  color: var(--emerald);
  background: var(--emerald-soft);
}
.copy {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--faint);
  background: none;
  border: none;
  padding: 0;
  height: auto;
  cursor: pointer;
  font-weight: 500;
  border-radius: 0;
  box-shadow: none;
  transition: color 0.12s ease;
}
.copy:hover {
  color: var(--ink);
  background: none;
  box-shadow: none;
}
.copy.done {
  color: var(--ok);
}
.copy svg {
  width: 12px;
  height: 12px;
}
.out-body {
  padding: 11px 13px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--code-bg);
  color: #3f3f46;
  flex: 1;
  min-height: 60px;
  max-height: 240px;
  overflow: auto;
}
.out.err .out-body {
  background: #fef2f2;
  color: var(--err);
  white-space: normal;
  font-family: var(--sans);
}
.out.err .out-name {
  color: var(--err);
}

/* syntax */
.k {
  color: #4f46e5;
}
.s {
  color: #047857;
}
.n {
  color: #c2410c;
}
.c {
  color: #be185d;
}
.op {
  color: #475569;
}

footer {
  position: relative;
  z-index: 1;
  text-align: center;
  font-size: 12px;
  color: var(--faint);
  padding: 18px;
}
/* biome-ignore lint/style/noDescendingSpecificity: footer links are independent of topbar links */
footer a {
  color: var(--faint);
}
.sep {
  margin: 0 6px;
}

@media (max-width: 560px) {
  .brand-tag {
    display: none;
  }
}