:root {
  --bg: #fafafa;
  --fg: #18181b;
  --muted: #52525b;
  --accent: #2563eb;
  --border: #e4e4e7;
  --card: #fff;
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
}

.site-header .brand {
  color: var(--fg);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.site-header .brand:hover {
  color: var(--accent);
}

header a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.card-title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.link-row a {
  color: var(--accent);
  font-weight: 600;
}

.card-cta {
  background: #eff6ff;
  border-color: #bfdbfe;
}

.share-url code {
  display: block;
  word-break: break-all;
  font-size: 0.85rem;
  background: #f4f4f5;
  padding: 0.5rem 0.65rem;
  border-radius: 6px;
  margin: 0.5rem 0;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin: 1.25rem 0;
}

label {
  display: block;
  font-weight: 600;
  margin: 0.75rem 0 0.25rem;
  font-size: 0.9rem;
}

input[type="number"],
input[type="email"] {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

button,
.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.65rem 1.1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-size: 1rem;
}

a.btn.secondary,
button.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

a.btn.secondary:hover,
button.secondary:hover {
  background: #eff6ff;
}

.site-footer .copy {
  display: block;
  margin-top: 0.5rem;
}

.result {
  margin-top: 1rem;
  padding: 1rem;
  background: #f4f4f5;
  border-radius: 8px;
  font-variant-numeric: tabular-nums;
}

.disclaimer-box {
  font-size: 0.85rem;
  color: var(--muted);
  border-left: 3px solid var(--border);
  padding-left: 0.75rem;
  margin: 1rem 0;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  margin-right: 1rem;
}