*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  position: relative;
}

#sky {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
  contain: strict;
}

.star {
  opacity: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--star-color);
  border-radius: 100%;
  transform-origin: 0 0;
  animation-name: starFly, starFade;
  animation-timing-function: linear, linear;
  animation-iteration-count: infinite, infinite;
  will-change: transform, opacity;
}

.size-1 {
  width: 1px;
  height: 1px;
}

.size-2 {
  width: 2px;
  height: 2px;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}

.sidebar {
  border-right: 2.5px solid var(--line);
  padding: 30px 20px;
  background: var(--panel);
}

.main-shell {
  position: relative;
  padding: 18px;
}

@keyframes starFly {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(var(--dx), var(--dy), 0); }
}

@keyframes starFade {
  0% { opacity: 0; }
  12% { opacity: 0; }
  22% { opacity: var(--peak-opacity, 0.9); }
  100% { opacity: var(--peak-opacity, 0.9); }
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    border-right: 0;
    border-bottom: 2.5px solid var(--line);
  }
  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .star {
    animation: none !important;
    opacity: 0.25;
  }
}