:root {
  color-scheme: dark;
  --panel: rgba(13, 16, 34, 0.75);
  --text: #ecf2ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #131a38, #070a16 45%, #02020a);
  color: var(--text);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem;
}

.controls {
  background: var(--panel);
  border: 1px solid rgba(119, 239, 255, 0.35);
  border-radius: 14px;
  padding: 1rem 1.2rem;
  backdrop-filter: blur(8px);
  margin-bottom: 1rem;
  box-shadow: 0 0 24px rgba(119, 239, 255, 0.15);
}

h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  letter-spacing: 0.02em;
}

p {
  margin: 0.6rem 0 0.8rem;
  opacity: 0.9;
}

small {
  display: block;
  opacity: 0.85;
}

.buttons {
  display: flex;
  gap: 0.65rem;
  margin-bottom: 0.5rem;
}

button {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(180deg, rgba(94, 125, 255, 0.35), rgba(45, 70, 209, 0.3));
  color: var(--text);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

button:hover:not([disabled]) {
  transform: translateY(-1px);
  box-shadow: 0 0 18px rgba(84, 173, 255, 0.45);
}

button[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

canvas {
  width: 100%;
  height: min(72vh, 860px);
  display: block;
  border-radius: 16px;
  border: 1px solid rgba(200, 220, 255, 0.2);
  background: radial-gradient(circle at center, rgba(28, 33, 80, 0.65), rgba(4, 4, 18, 0.9));
  box-shadow: inset 0 0 55px rgba(158, 100, 255, 0.15), 0 18px 45px rgba(0, 0, 0, 0.45);
}