/* Deliberately small and dependency-free — this is a dev tool for looking
   at parser/eval output, not a design showcase. Everything the rendered
   template itself produces is left unstyled on purpose (see `.rendered`
   below): a template's own output should look like whatever the host
   would give it, not like this page. */

:root {
  --bg: #fbfbfa;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --line: #dcdcd8;
  --card: #fff;
  --err: #b3261e;
  --accent: #2b5c8a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e6e6e4;
    --muted: #9a9a97;
    --line: #303237;
    --card: #1d1f23;
    --err: #f2837b;
    --accent: #7fb3e0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

.wrap { max-width: 1200px; margin: 0 auto; }

h1 { font-size: 1.4rem; margin: 0 0 .25rem; }
h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 .5rem; }

.hint { color: var(--muted); font-size: .85rem; margin: 0 0 1rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1rem;
}

summary { cursor: pointer; font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }

/* Two panels side by side, stacking on narrow screens. */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 800px) { .cols { grid-template-columns: 1fr; } }

.row { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }

.input {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.45;
  padding: .6rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  resize: vertical;
}

/* Both the language reference and the AST dump. Wide content scrolls
   inside the box rather than stretching the page. */
.ref {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  line-height: 1.45;
  margin: .75rem 0 0;
  padding: .6rem;
  max-height: 420px;
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
}

/* Output of the user's own template. No element styling here on purpose. */
.rendered { padding: .25rem 0; overflow-x: auto; }

.err { color: var(--err); font-family: ui-monospace, monospace; font-size: 13px; white-space: pre-wrap; }
.empty { color: var(--muted); font-size: .85rem; font-style: italic; }

.btn {
  font: inherit;
  font-size: .8rem;
  padding: .2rem .7rem;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
}
.btn:disabled { opacity: .45; cursor: default; }
.btn-active { background: var(--accent); color: var(--card); border-color: var(--accent); }

.mode-toggle { display: flex; gap: .4rem; }

.tabs { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin: .5rem 0; }
.tab { display: flex; align-items: center; gap: .2rem; padding: .1rem .1rem .1rem .5rem; border: 1px solid var(--line); border-radius: 4px; background: var(--bg); }
.tab-active { border-color: var(--accent); }
.tab-error { border-color: var(--err); }
.tab-name { font: inherit; font-size: .8rem; border: none; background: transparent; color: var(--fg); width: 6.5rem; }
.tab-name:focus { outline: none; }
.tab-close { border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: .9rem; line-height: 1; padding: .2rem .4rem; border-radius: 3px; }
.tab-close:hover:not(:disabled) { background: var(--line); }
.tab-close:disabled { opacity: .35; cursor: default; }

.log { list-style: none; margin: 0; padding: 0; }
.log li {
  display: flex;
  gap: .75rem;
  padding: .35rem 0;
  border-bottom: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
}
.log li:last-child { border-bottom: 0; }
.log-key { color: var(--accent); flex: 0 0 auto; }
.log-payload { color: var(--muted); overflow-wrap: anywhere; }