/* Shared cosmic background layer — use with <canvas id="bg"> + /visuals.js */
:root {
  --cosmic-bg: #0c0c0e;
}

#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

body.cosmic-site {
  background: var(--cosmic-bg);
  position: relative;
  overflow-x: hidden;
  min-height: 100dvh;
}

/* Stack top-level UI above the fixed canvas (toolbar manages its own z-index). */
body.cosmic-site > :not(#bg):not(.cosmic-toolbar) {
  position: relative;
  z-index: 1;
}

/* Flatten page-level gradients so the canvas reads clearly; cards keep their own surfaces. */
body.cosmic-site.math-meteor {
  background: var(--cosmic-bg);
}

/* --- Inner pages: compact planet toolbar (Home left, site areas right) --- */
.cosmic-toolbar {
  --cosmic-toolbar-accent: #c4a574;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem 1rem;
  padding: 0.55rem 1rem;
  margin: 0;
  background: rgba(10, 10, 14, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(196, 165, 116, 0.14);
  position: sticky;
  top: 0;
  z-index: 30;
}

.cosmic-toolbar__sites {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem 0.55rem;
  flex: 1;
  min-width: min(100%, 12rem);
}

.cosmic-toolbar__link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  text-decoration: none;
  color: var(--cosmic-toolbar-accent);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.1;
  max-width: 4.5rem;
  text-align: center;
  transition: color 0.15s ease, opacity 0.15s ease;
}

.cosmic-toolbar__link:hover,
.cosmic-toolbar__link:focus-visible {
  color: #e8d4b0;
}

.cosmic-toolbar__link:focus-visible {
  outline: 2px solid var(--cosmic-toolbar-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.cosmic-toolbar__link--current {
  opacity: 0.55;
  pointer-events: none;
}

.cosmic-toolbar__orb {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow:
    inset -5px -6px 10px rgba(0, 0, 0, 0.45),
    0 0 16px rgba(255, 255, 255, 0.06);
}

.cosmic-toolbar__link--home .cosmic-toolbar__orb {
  background: radial-gradient(
    circle at 32% 28%,
    rgb(150, 118, 175),
    rgb(52, 36, 68) 58%,
    rgb(24, 18, 32) 100%
  );
}

.cosmic-toolbar__link--volley .cosmic-toolbar__orb {
  background: radial-gradient(
    circle at 32% 30%,
    rgb(95, 125, 145),
    rgb(32, 48, 58) 62%,
    rgb(18, 26, 32) 100%
  );
  box-shadow:
    inset -5px -6px 10px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(130, 165, 188, 0.35),
    0 0 16px rgba(255, 255, 255, 0.06);
}

.cosmic-toolbar__link--fivb .cosmic-toolbar__orb {
  background: radial-gradient(
    circle at 30% 28%,
    rgb(105, 165, 145),
    rgb(38, 72, 62) 60%,
    rgb(18, 32, 28) 100%
  );
}

.cosmic-toolbar__link--matchup .cosmic-toolbar__orb {
  background: radial-gradient(
    circle at 32% 30%,
    rgb(130, 140, 205),
    rgb(52, 58, 95) 62%,
    rgb(28, 30, 48) 100%
  );
}

.cosmic-toolbar__link--math .cosmic-toolbar__orb {
  background: radial-gradient(
    circle at 32% 28%,
    rgb(215, 175, 125),
    rgb(95, 65, 42) 58%,
    rgb(38, 28, 20) 100%
  );
}