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

html, body {
  height: 100%;
}

body {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: #ffffff;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 48px;
  padding: 40px 20px;
  text-align: center;
  width: 100%;
  max-width: 900px;
}

/* Canvas */
#radar {
  display: block;
  width: min(450px, 75vmin);
  height: min(450px, 75vmin);
  border-radius: 50%;
}

/* Typography */
h1 {
  font-family: 'Poppins', system-ui, sans-serif;
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  color: #ffffff;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.6), 0 0 30px rgba(23, 200, 103, 0.2);
}

.subtitle {
  font-size: clamp(15px, 2.2vw, 18px);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
  max-width: 520px;
  letter-spacing: 0.3px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 640px) {
  .hero {
    gap: 32px;
  }

  h1 {
    font-size: 32px;
  }

  #radar {
    width: 80vmin;
    height: 80vmin;
  }
}