:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c2024;
  --muted: #5f6b7a;
  --border: #d5dbe3;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --ok: #15803d;
  --warn: #b45309;
  --error: #b91c1c;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --card: #1a1f25;
    --text: #e6e9ed;
    --muted: #97a3b1;
    --border: #313942;
    --accent: #3b82f6;
    --accent-text: #ffffff;
    --ok: #4ade80;
    --warn: #fbbf24;
    --error: #f87171;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

h1 { margin: 0; font-size: 1.75rem; }
h1 span { color: var(--muted); font-weight: 400; }
.sub { margin: 4px 0 24px; color: var(--muted); }

form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

label { display: block; font-weight: 600; margin-bottom: 6px; }

textarea {
  width: 100%;
  min-height: 140px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
  word-break: break-all;
}
textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin: 12px 0 20px;
}

button, .button {
  appearance: none;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}
button:hover, .button:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.1); }

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 0 6px;
  font-weight: 400;
  color: var(--muted);
  cursor: pointer;
}
code { font-size: 0.9em; }

.button[hidden] { display: none; }

#status { margin: 0; min-height: 1.5em; color: var(--muted); }
#status.ok { color: var(--ok); }
#status.warn { color: var(--warn); }
#status.error { color: var(--error); }