@property --step {
  syntax: "<integer>";
  inherits: true;
  initial-value: 1;
}
html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.tu {
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-sizing: border-box;
  width: min(100%, 408px);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
}

.tu__head {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0;
}

.tu__badge {
  flex: 0 0 auto;
  box-sizing: border-box;
  padding: 0 8px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 800;
  font-size: clamp(9px, 2.4vw, 10px);
  line-height: 1.8;
  font-variant-numeric: tabular-nums;
}

.tu__slot {
  display: grid;
  flex: 1 1 auto;
  min-width: 0;
}

.tu__slot > * {
  grid-area: 1/1;
}

.tu__task {
  color: rgba(23, 20, 26, 0.72);
  font-weight: 700;
  font-size: clamp(9px, 2.6vw, 11px);
  line-height: 1.5;
  visibility: hidden;
}

.tu[data-step="2"] {
  --step: 2;
}

.tu[data-step="3"] {
  --step: 3;
}

.tu__no::after {
  counter-reset: s var(--step);
  content: counter(s);
}

.tu[data-step="1"] .tu__task[data-step="1"],
.tu[data-step="2"] .tu__task[data-step="2"],
.tu[data-step="3"] .tu__task[data-step="3"] {
  visibility: visible;
}

.tu__rail {
  margin: 0;
  height: 4px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(23, 20, 26, 0.12);
}

.tu__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: #2b9d74;
  transform: scaleX(0.3334);
  transform-origin: left center;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.tu[data-step="2"] .tu__fill {
  transform: scaleX(0.6667);
}

.tu[data-step="3"] .tu__fill {
  transform: scaleX(1);
}

.tu__win {
  display: flex;
  align-items: center;
  gap: 8px;
  box-sizing: border-box;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  background: #17141a;
}

.tu__sign {
  flex: 0 0 auto;
  color: #2b9d74;
  font-weight: 800;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1.4;
}

.tu__input {
  flex: 1 1 auto;
  min-width: 0;
  box-sizing: border-box;
  border: 0;
  background: none;
  color: #fff7e6;
  font-family: inherit;
  font-weight: 600;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.5;
}

.tu__input::placeholder {
  color: rgba(255, 255, 255, 0.46);
}

.tu__input:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
  border-radius: 4px;
}

.tu__say {
  flex: 0 0 auto;
  box-sizing: border-box;
  padding: 0 8px;
  border-radius: 999px;
  font-weight: 800;
  font-size: clamp(9px, 2.4vw, 10px);
  line-height: 1.8;
  transform: scale(0.7);
  transform-origin: 50% 50%;
  visibility: hidden;
  transition: transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.tu__say--ok {
  background: #2b9d74;
  color: #17141a;
}

.tu__say--no {
  background: #ffe0d8;
  color: #17141a;
}

.tu.is-ok .tu__say--ok, .tu.is-no .tu__say--no {
  visibility: visible;
  transform: scale(1);
}

.tu.is-demo .tu__task,
.tu.is-demo .tu__badge {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.tu.is-demo .tu__task[data-step="1"] {
  animation-name: tuTask1;
}

.tu.is-demo .tu__task[data-step="2"] {
  animation-name: tuTask2;
}

.tu.is-demo .tu__task[data-step="3"] {
  animation-name: tuTask3;
}

@keyframes tuTask1 {
  0%, 29% {
    visibility: visible;
  }
  30%, 100% {
    visibility: hidden;
  }
}
@keyframes tuTask2 {
  0%, 29% {
    visibility: hidden;
  }
  30%, 61% {
    visibility: visible;
  }
  62%, 100% {
    visibility: hidden;
  }
}
@keyframes tuTask3 {
  0%, 61% {
    visibility: hidden;
  }
  62%, 100% {
    visibility: visible;
  }
}
.tu.is-demo .tu__badge {
  animation-name: tuBadge;
}

.tu.is-demo {
  animation-name: tuStep;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes tuStep {
  0%, 29% {
    --step: 1;
  }
  30%, 61% {
    --step: 2;
  }
  62%, 100% {
    --step: 3;
  }
}
@keyframes tuBadge {
  0%, 29% {
    background: #17141a;
  }
  30%, 61% {
    background: #2f6df6;
  }
  62%, 100% {
    background: #2b9d74;
    color: #17141a;
  }
}
.tu.is-demo .tu__fill {
  animation-name: tuFill;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes tuFill {
  0%, 29% {
    transform: scaleX(0.3334);
  }
  42%, 61% {
    transform: scaleX(0.6667);
  }
  74%, 100% {
    transform: scaleX(1);
  }
}
.tu.is-demo .tu__say--ok {
  animation-name: tuOk;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes tuOk {
  0%, 23% {
    visibility: hidden;
    transform: scale(0.7);
  }
  24% {
    visibility: visible;
    transform: scale(0.7);
  }
  30%, 55% {
    visibility: visible;
    transform: scale(1);
  }
  56%, 100% {
    visibility: hidden;
    transform: scale(1);
  }
}
@media (max-width: 340px) {
  .tu {
    gap: 4px;
  }
  .tu__win {
    padding-left: 8px;
    padding-right: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .tu.is-demo,
  .tu.is-demo .tu__task,
  .tu.is-demo .tu__badge,
  .tu.is-demo .tu__fill,
  .tu.is-demo .tu__say--ok {
    animation: none !important;
  }
  .tu.is-demo .tu__task[data-step="1"] {
    visibility: visible !important;
  }
  .tu.is-demo .tu__task[data-step="2"],
  .tu.is-demo .tu__task[data-step="3"] {
    visibility: hidden !important;
  }
  .tu__fill, .tu__say {
    transition: none !important;
  }
}