/* Super Counter — mobile-first, system fonts, no framework. */

:root {
  --bg: #fafafa;
  --fg: #111;
  --muted: #666;
  --accent: #2563eb;
  --accent-fg: #fff;
  --border: #d4d4d4;
  --card: #fff;
  --error: #b91c1c;
  --ok: #15803d;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0b;
    --fg: #f5f5f5;
    --muted: #a1a1aa;
    --accent: #60a5fa;
    --accent-fg: #0b0b0b;
    --border: #2a2a2a;
    --card: #161616;
    --error: #fca5a5;
    --ok: #86efac;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100dvh;
}

body {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}

.lede {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 1rem;
}

.count {
  margin: 0 0 20px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  background: var(--bg);
}

.count__num {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.count__label {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

input[type="text"] {
  font: inherit;
  width: 100%;
  padding: 14px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--fg);
}

input[type="text"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button[type="submit"] {
  font: inherit;
  font-weight: 600;
  padding: 14px 14px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-fg);
  cursor: pointer;
  transition: filter 0.1s ease;
}

button[type="submit"]:hover { filter: brightness(0.95); }
button[type="submit"]:disabled { opacity: 0.6; cursor: not-allowed; }

.message {
  min-height: 1.25em;
  margin: 14px 0 0;
  font-size: 0.95rem;
}
.message.is-error { color: var(--error); }
.message.is-ok    { color: var(--ok); }

.fineprint {
  margin: 20px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}