/* Cool and professional: a blue/teal palette */
:root {
  --bg: #f0f9ff; /* very light blue background */
  --card: #ffffff;
  --accent: #06b6d4; /* vibrant cyan */
  --accent-dark: #0891b2; /* darker cyan */
  --muted: #64748b; /* cool gray */
  --max-w: 900px;
  --radius: 14px;
  --pad: 20px;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: #2d2d2d;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

.container {
  max-width: var(--max-w);
  margin: 24px auto;
  padding: 0 16px;
}

.site-header {
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.1), rgba(255,255,255,0));
  padding: 26px 0;
  border-bottom: 2px solid rgba(0,0,0,0.05);
}

.site-header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: var(--pad);
  margin: 18px 0;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(0,0,0,0.04);
  transition: transform 0.1s ease-in-out;
}
.card:hover {
  transform: translateY(-2px);
}

.join-grid {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.whatsapp-cta {
  display: inline-block;
  padding: 14px 20px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  color: white;
  text-decoration: none;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(6, 182, 212, 0.25);
  transition: background 0.2s ease, transform 0.1s ease-in-out;
}
.whatsapp-cta:hover {
  background: linear-gradient(90deg, var(--accent-dark), var(--accent));
  transform: scale(1.02);
}

.qr {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.qr img {
  border-radius: 10px;
  background: #fff;
  padding: 6px;
  border: 2px solid rgba(6, 182, 212, 0.25);
}
.qr figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 8px;
}

h2 {
  margin-top: 0;
  font-size: 1.3rem;
  color: var(--accent-dark);
}

h3 {
  color: var(--accent-dark);
}

.small {
  color: var(--muted);
  font-size: 0.9rem;
}

.disclaimer {
  background: linear-gradient(0deg, #f0f9ff, #ffffff);
  border-left: 5px solid var(--accent);
}

.site-footer {
  padding: 20px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 2px solid rgba(0,0,0,0.05);
}

code {
  background: #e0f2fe;
  padding: 2px 6px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", monospace;
}

@media (max-width: 600px) {
  .join-grid {
    flex-direction: column;
    align-items: flex-start;
  }
  .whatsapp-cta {
    width: 100%;
    text-align: center;
  }
}