.center-ribbon {
  position: fixed;
  top: 18px;
  left: 264px;
  z-index: 18;
  display: grid;
  gap: 10px;
  align-items: start;
  transition: opacity 160ms ease, transform 160ms ease;
}

.center-ribbon summary {
  list-style: none;
}

.center-ribbon summary::-webkit-details-marker {
  display: none;
}

.center-ribbon-handle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 18px;
  border: 1px solid rgba(17, 54, 105, 0.22);
  background: linear-gradient(135deg, rgba(12, 35, 70, 0.96), rgba(26, 73, 135, 0.94));
  color: #f7fbff;
  box-shadow: 0 18px 42px rgba(7, 18, 37, 0.28);
  cursor: pointer;
  user-select: none;
  animation: center-ribbon-nudge 2.8s ease-in-out infinite;
  transition:
    transform 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.center-ribbon-handle:hover,
.center-ribbon:focus-within .center-ribbon-handle,
.center-ribbon[open] .center-ribbon-handle {
  animation: none;
  transform: translateY(2px);
  background: linear-gradient(135deg, rgba(17, 54, 105, 0.98), rgba(40, 94, 163, 0.96));
  box-shadow: 0 22px 46px rgba(7, 18, 37, 0.32);
}

.center-ribbon-handle-text {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1;
  white-space: nowrap;
}

.center-ribbon-handle-icon {
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 180ms ease;
}

.center-ribbon[open] .center-ribbon-handle-icon {
  transform: rotate(225deg);
}

.center-ribbon-panel {
  width: min(240px, calc(100vw - 36px));
  display: grid;
  gap: 6px;
  padding: 8px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(10, 23, 44, 0.96);
  backdrop-filter: blur(16px);
  box-shadow: 0 24px 54px rgba(8, 19, 37, 0.34);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
  transition:
    opacity 180ms ease,
    transform 180ms ease,
    visibility 180ms ease;
}

.center-ribbon:hover .center-ribbon-panel,
.center-ribbon:focus-within .center-ribbon-panel,
.center-ribbon[open] .center-ribbon-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.center-ribbon-link {
  display: grid;
  gap: 3px;
  width: 100%;
  padding: 10px 12px;
  min-height: 54px;
  align-content: center;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.06);
  color: #f4f8ff;
  text-decoration: none;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.center-ribbon-link:hover {
  transform: translateX(2px);
  background: rgba(255, 255, 255, 0.11);
  border-color: rgba(255, 255, 255, 0.16);
}

.center-ribbon-link strong {
  font-size: 0.84rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-align: left;
}

.center-ribbon-link small {
  display: block;
  font-size: 0.68rem;
  line-height: 1.3;
  color: rgba(229, 237, 248, 0.72);
}

.center-ribbon-link.is-active {
  background: linear-gradient(135deg, #f1c84c, #f7d86a);
  border-color: rgba(175, 126, 0, 0.42);
  color: #322300;
  box-shadow: 0 14px 28px rgba(114, 84, 2, 0.18);
}

.center-ribbon-link.is-active small {
  color: rgba(50, 35, 0, 0.72);
}

.page-shell.sidebar-open .center-ribbon {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}

@keyframes center-ribbon-nudge {
  0%,
  72%,
  100% {
    transform: translateY(0);
  }

  78% {
    transform: translateY(3px);
  }

  86% {
    transform: translateY(1px);
  }
}

@media (max-width: 980px) {
.center-ribbon {
    top: 12px;
    left: auto;
    right: 14px;
  }

  .center-ribbon-panel {
    width: min(220px, calc(100vw - 24px));
  }

  .center-ribbon-handle {
    min-height: 40px;
    padding: 9px 12px;
    border-radius: 16px;
  }

  .center-ribbon-link {
    min-height: 50px;
    padding: 9px 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .center-ribbon,
  .center-ribbon * {
    transition: none !important;
  }

  .center-ribbon-handle {
    animation: none !important;
  }
}