@keyframes appear-then-fade {
  0%      { opacity: 0; transform: translateY(-0.5em); }
  5%,60%  { opacity: 1; transform: translateY(0); }
  100%    { opacity: 0; transform: translateY(0); }
}

@keyframes pulsing-outline {
  0%  { outline-width: 0; }
  33% { outline-width: 4px; }
}

@keyframes shake {
  0%  { transform: translateX(-2rem); }
  25% { transform: translateX(2rem); }
  50% { transform: translateX(-1rem); }
  75% { transform: translateX(1rem); }
}

@keyframes submitting {
  0%    { -webkit-mask-position: 0% 0%,   50% 0%,   100% 0% }
  12.5% { -webkit-mask-position: 0% 50%,  50% 0%,   100% 0% }
  25%   { -webkit-mask-position: 0% 100%, 50% 50%,  100% 0% }
  37.5% { -webkit-mask-position: 0% 100%, 50% 100%, 100% 50% }
  50%   { -webkit-mask-position: 0% 100%, 50% 100%, 100% 100% }
  62.5% { -webkit-mask-position: 0% 50%,  50% 100%, 100% 100% }
  75%   { -webkit-mask-position: 0% 0%,   50% 50%,  100% 100% }
  87.5% { -webkit-mask-position: 0% 0%,   50% 0%,   100% 50% }
  100%  { -webkit-mask-position: 0% 0%,   50% 0%,   100% 0% }
}

@keyframes success {
  0%  { background-color: var(--color-border-darker); scale: 0.8; }
  33% { background-color: var(--color-border-darker); scale: 1; }
}

@keyframes wiggle {
  0%   { transform: rotate(0deg); }
  20%  { transform: rotate(3deg); }
  40%  { transform: rotate(-3deg); }
  60%  { transform: rotate(3deg); }
  80%  { transform: rotate(-3deg); }
  100% { transform: rotate(0deg); }
}

@keyframes zoom-fade {
  100% { transform: translateY(-1.5em); scale: 2; opacity: 0; }
}

@keyframes border-fade-out {
  from {
    border-color: var(--color-text);
  }

  to {
    border-color: transparent;
  }
}

@keyframes message-arrive {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
}

@keyframes badge-in {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
}

@keyframes empty-state-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
}

@keyframes typing-dot {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30%           { opacity: 1;   transform: translateY(-2px); }
}

@keyframes bookmark-pop {
  from {
    opacity: 0;
    transform: scale(0.94);
  }
}

@keyframes thread-link-highlight {
  from { background-color: var(--color-selected); }
  to   { background-color: transparent; }
}

@keyframes mention-fade-out {
  0%, 25% { background-color: var(--color-message-mentioned); }
  100%    { background-color: transparent; }
}

@keyframes feedback-reduced {
  0%, 33% { background-color: var(--color-border-darker); }
}

@keyframes pulse-reduced {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}

@keyframes appear-then-fade-reduced {
  0%      { opacity: 0; }
  5%,60%  { opacity: 1; }
  100%    { opacity: 0; }
}