* { box-sizing: border-box; margin:0; padding:0; }
body {
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
}

header {
  background: #1e293b;
  padding: 1rem 1.5rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.4);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

h1 { 
  font-size: clamp(1.8rem, 5vw, 2.2rem); 
  margin: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.btn {
  padding: 0.65rem 1.3rem;
  background: #3b82f6;
  color: white;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn:hover {
  background: #2563eb;
  transform: translateY(-1px);
}

/* Mass Import button – green */
.btn-mass {
  background: #10b981;
}

.btn-mass:hover {
  background: #059669;
}

/* Add Single Card button – purple */
.btn-single {
  background: #8b5cf6;
}

.btn-single:hover {
  background: #7c3aed;
}

/* Mobile responsive */
@media (max-width: 900px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  nav {
    margin-top: 0.8rem;
  }
}

.hero {
  text-align: center;
  padding: 6rem 1rem 4rem;
}

.hero h2 { font-size: 3rem; margin-bottom: 1rem; }
.hero p { font-size: 1.3rem; color: #94a3b8; }