:root {
  --bg: #0f1419;
  --card: #1a222c;
  --text: #e7ecf1;
  --muted: #9aa7b5;
  --accent: #c45c26;
  --ok: #3d9a6a;
  --err: #c44;
  --border: #2a3542;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 10% -10%, #243044, var(--bg));
  color: var(--text);
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

h1 {
  font-size: 1.6rem;
  font-weight: 650;
  margin: 0 0 0.5rem;
}

.hint {
  color: var(--muted);
  margin: 0 0 1.5rem;
  line-height: 1.45;
}

form {
  display: grid;
  gap: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  background: #121820;
  color: var(--text);
  font: inherit;
}

textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
}

button {
  appearance: none;
  border: 0;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.results {
  margin-top: 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.results.hidden {
  display: none;
}

.results h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.counts {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.counts .ok {
  color: var(--ok);
}

.counts .bad {
  color: var(--err);
}

.fail-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.fail-list li {
  margin: 0.35rem 0;
}

.error-banner {
  color: var(--err);
  margin: 0;
}