:root {
  color-scheme: light dark;
  --bg: #f6f7f5;
  --panel: #ffffff;
  --text: #1c2321;
  --muted: #5b6662;
  --border: #d5dbd8;
  --accent: #0b7a5a;
  --accent-text: #ffffff;
  --error: #b3261e;
  --ok: #0b7a5a;
  --warn-bg: #fff4d6;
  --warn-text: #5c4400;
  --code-bg: #eef1ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111615;
    --panel: #1a211f;
    --text: #e6ebe9;
    --muted: #a0aba7;
    --border: #33403c;
    --accent: #3fc79c;
    --accent-text: #08130f;
    --error: #ff8a80;
    --ok: #3fc79c;
    --warn-bg: #3a3014;
    --warn-text: #f5e3a8;
    --code-bg: #232c29;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding-block: 2rem;
  padding-inline: 1rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main { max-width: 40rem; margin: 0 auto; }

h1 { font-size: 1.6rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.1rem; margin: 0 0 0.75rem; display: flex; align-items: center; gap: 0.5rem; }

.num {
  display: inline-grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 0.9rem;
}

.lead { color: var(--muted); margin: 0 0 1.5rem; }

section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

form { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: end; }
label { flex-basis: 100%; font-weight: 600; font-size: 0.95rem; }

input, textarea {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  padding: 0.55rem 0.7rem;
}
input { flex: 1 1 14rem; min-width: 0; }
input:focus, textarea:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 0.4rem;
  padding: 0.55rem 1rem;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: progress; }

button.link {
  background: none;
  color: var(--accent);
  padding: 0;
  font-weight: normal;
  text-decoration: underline;
}

.hint { color: var(--muted); font-size: 0.9rem; margin: 0.75rem 0 0; }

.token-box { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.token-box textarea {
  flex: 1 1 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  word-break: break-all;
  resize: vertical;
}

pre {
  background: var(--code-bg);
  border-radius: 0.4rem;
  padding: 0.6rem 0.8rem;
  overflow-x: auto;
  font-size: 0.85rem;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
pre code { white-space: pre-wrap; word-break: break-all; }

.warn {
  background: var(--warn-bg);
  color: var(--warn-text);
  border-radius: 0.4rem;
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
}

#status { min-height: 1.5rem; margin: 0.5rem 0; }
#status.error { color: var(--error); font-weight: 600; }
#status.ok { color: var(--ok); }

footer { color: var(--muted); font-size: 0.85rem; margin-top: 2rem; }
footer a { color: var(--accent); }