:root {
  --fg: #1a1a1f;
  --muted: #5a5a68;
  --line: #e2e2ea;
  --accent: #3b3bb8;
  --code-bg: #f5f5fa;
  --ok: #0a6b3d;
  --bad: #a01028;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--fg);
  background: #fff;
}

main { max-width: 52rem; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 0.75rem; letter-spacing: -0.01em; }
h2 { font-size: 1.25rem; margin: 2.5rem 0 0.75rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }

.lede { font-size: 1.05rem; color: #33333d; }
.note { color: var(--muted); font-size: 0.9rem; }

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

code {
  font: 0.875em ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
pre code { background: none; padding: 0; font-size: 0.85rem; }

table { border-collapse: collapse; width: 100%; margin: 0.75rem 0; font-size: 0.9rem; }
th, td { border: 1px solid var(--line); padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
th { background: var(--code-bg); font-weight: 600; }

blockquote {
  margin: 0.75rem 0;
  padding: 0.6rem 0.9rem;
  border-left: 3px solid #d8b23a;
  background: #fdf9ec;
  color: #4a3f18;
}

hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* The boot line is a status, not decoration: it says what is happening and, on failure, what a
   reader can still do. It must never be the only thing on the page. */
.boot {
  font-size: 0.9rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  background: var(--code-bg);
}
.boot.ready { color: var(--ok); border-color: #b8dcc6; background: #f2fbf6; }
.boot.failed { color: var(--bad); border-color: #e7bcc4; background: #fdf3f5; }

#headline-result { border: 1px solid var(--line); border-radius: 8px; padding: 0.25rem 1.25rem 1.25rem; margin-top: 2rem; }

.panel { border-top: 1px solid var(--line); padding-top: 0.5rem; }

label { display: block; margin: 0.9rem 0 0.3rem; font-size: 0.85rem; font-weight: 600; color: var(--muted); }

textarea, select {
  width: 100%;
  font: 0.85rem ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--fg);
}
textarea:disabled, select:disabled, button:disabled { opacity: 0.55; cursor: not-allowed; }

button {
  font: 0.9rem/1 inherit;
  padding: 0.55rem 1rem;
  margin-top: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--fg);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.row { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.out:not(:empty) { margin-top: 1rem; border-top: 1px dashed var(--line); padding-top: 0.5rem; }

footer { margin-top: 3rem; border-top: 1px solid var(--line); padding-top: 1rem; font-size: 0.9rem; }

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8f0; --muted: #a0a0b0; --line: #33333f; --accent: #9aa8ff;
    --code-bg: #1b1b24; --ok: #6fd39b; --bad: #ff8fa4;
  }
  body { background: #121218; }
  .lede { color: #d0d0dc; }
  textarea, select, button { background: #1b1b24; color: var(--fg); }
  button.primary { background: #4a4ac8; border-color: #4a4ac8; color: #fff; }
  th { background: #1b1b24; }
  blockquote { background: #24200f; color: #e6d9a8; }
  .boot.ready { background: #14241b; border-color: #2b5a3f; }
  .boot.failed { background: #2a1418; border-color: #6b2634; color: #ff8fa4; }
}