body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: radial-gradient(circle at top, #0b1220, #020617);
  color: #e5e7eb;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  margin: 0;
  font-size: 32px;
}

header p {
  opacity: 0.7;
}

.app-header {
  text-align: center;
  margin-bottom: 30px;
  position: relative;
}

.back {
  position: absolute;
  left: 0;
  top: 0;
  color: #9ca3af;
  text-decoration: none;
  font-size: 14px;
}

.app-header h1 {
  margin: 0;
  font-size: 30px;
}

.app-header p {
  margin-top: 6px;
  opacity: 0.7;
}

.filter {
  max-width: 400px;
  margin: 0 auto 20px;
}

select {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: none;
  background: #020617;
  color: #e5e7eb;
}

.groups {
  max-width: 600px;
  margin: auto;
  display: grid;
  gap: 16px;
}

.group-card {
  background: #020617;
  padding: 16px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.group-card h3 {
  margin: 0 0 6px;
}

.group-meta {
  font-size: 14px;
  opacity: 0.85;
  margin-bottom: 8px;
}

.badge {
  display: inline-block;
  background: #1f2937;
  color: #9ca3af;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
}

footer {
  text-align: center;
  margin-top: 40px;
}

.app-cta {
  display: inline-block;
  margin-top: 10px;
  padding: 14px 22px;
  background: #22c55e;
  color: #022c22;
  font-weight: 700;
  border-radius: 14px;
  text-decoration: none;
}

.app-footer {
  text-align: center;
  margin-top: 40px;
  opacity: 0.85;
  font-size: 14px;
}

body {
  line-height: 1.6;
}

button, a {
  font-family: inherit;
}