:root {
  --primary-color: oklch(0.65 0.25 260);
  --secondary-color: oklch(0.65 0.25 320);
  --accent-color: oklch(0.85 0.15 150);
  --bg-color: oklch(0.15 0.02 260);
  --card-bg: oklch(0.2 0.03 260);
  --text-primary: oklch(0.95 0.01 260);
  --text-secondary: oklch(0.75 0.02 260);
  --shadow-color: rgba(0, 0, 0, 0.4);
  --font-main: 'Inter', system-ui, sans-serif;
  --font-heading: 'Outfit', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
}

.background-texture {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.container {
  max-width: 600px;
  width: 90%;
  text-align: center;
  z-index: 1;
  padding: 2rem 0;
}

header h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

header .highlight {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 2rem;
  padding: 3rem 2rem;
  box-shadow: 0 20px 40px var(--shadow-color), 
              0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  transition: transform 0.3s ease;
  margin-bottom: 2rem;
}

.card:hover {
  transform: translateY(-5px);
}

.ball-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  min-height: 100px;
  align-items: center;
  margin-bottom: 2.5rem;
}

.placeholder {
  color: var(--text-secondary);
  font-style: italic;
  opacity: 0.6;
}

.glow-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: 1rem 2.5rem;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2),
              0 0 20px var(--primary-color);
  position: relative;
  overflow: hidden;
}

.glow-button:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3),
              0 0 30px var(--secondary-color);
}

.glow-button:active {
  transform: scale(0.95);
}

footer {
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0.5;
}

/* Container query example */
@container (min-width: 400px) {
  .ball-container {
    gap: 1.5rem;
  }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .card {
    padding: 2rem 1rem;
  }
  
  .glow-button {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
  }
}