* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --scaleFactor: 1;
  --base-width: 1920px;
  --base-height: 1080px;
  --color-correct-base: #219150;
  --color-correct-light: #58d98b;
  --color-wrong-base: #ff6f61;
  --color-orange-base: #ff7f3f;
  --color-orange-light: #ff9c6a;
  --color-orange-dark: #e56529;
  --color-blue-base: #3498db;
  --color-blue-light: #5eb2e7;
  --color-gold-base: #f1c40f;
  --color-yellow-base: #ff9f1a;
  --color-purple-base: #9b59b6;
  --color-pink-base: #ff4d6d;
  --color-white-base: #ffffff;
  --panel-bg: #3a3a3a;
  --panel-inner: #2d2d2d;
  --page-bg: #4a4a4a;
  --font-family-primary: Arial, sans-serif;
}

html,
body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  font-family: var(--font-family-primary);
  background: #000;
}

.interactive-text {
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
  pointer-events: none;
}

.responsive-container {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

.responsive-wrapper {
  width: var(--base-width);
  height: var(--base-height);
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: top left;
  transform: scale(var(--scaleFactor)) translate(-50%, -50%);
  background: var(--page-bg);
}

.equiv-applet {
  width: 1920px;
  height: 1080px;
  padding: 28px 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
}

.equiv-header {
  text-align: center;
  font-size: 44px;
  font-weight: 700;
  color: var(--color-white-base);
  line-height: 1.2;
  min-height: 108px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 48px;
}

.equiv-header .interactive-text {
  max-width: 1600px;
}

.equiv-inline-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  line-height: 1;
  margin: 0 3px;
}

.equiv-inline-frac-num,
.equiv-inline-frac-den {
  font-size: 0.78em;
}

.equiv-inline-frac-bar {
  width: 0.95em;
  height: 0.08em;
  border-radius: 999px;
  background: currentColor;
  margin: 0.08em 0 0.1em;
}

.equiv-body {
  flex: 1;
  display: flex;
  gap: 28px;
  min-height: 0;
}

.equiv-main {
  flex: 1;
  background: var(--panel-bg);
  border-radius: 28px;
  padding: 36px 40px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  box-shadow: inset 0 2px 12px rgba(0, 0, 0, 0.35);
}

.equiv-main-top {
  width: 100%;
  flex: 0 0 20%;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.equiv-main-mid {
  width: 100%;
  flex: 0 0 50%;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.equiv-main-bottom {
  width: 100%;
  flex: 0 0 30%;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.equiv-main-multiplier {
  font-size: 40px;
  font-weight: 700;
  color: #fff;
  text-align: center;
}

.equiv-main-top-multipliers {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  width: 100%;
}

.equiv-main-top-slot {
  display: flex;
  align-items: center;
  justify-content: center;
}

.equiv-main-top-slot--col {
  width: 380px;
  flex: 0 0 380px;
}

.equiv-main-top-slot--eq {
  width: 56px;
  flex: 0 0 56px;
}

.equiv-sidebar {
  width: 340px;
  flex-shrink: 0;
  background: var(--panel-bg);
  border-radius: 28px;
  padding: 20px 24px;
  display: grid;
  grid-template-rows: 15% 70% 15%;
  justify-items: center;
  align-items: stretch;
  box-shadow: inset 0 2px 12px rgba(0, 0, 0, 0.35);
}

.equiv-sidebar-title {
  width: 100%;
  font-size: 22px;
  color: #c8c8c8;
  text-align: center;
  margin: 0;
  line-height: 1.3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.equiv-slider-wrap {
  position: relative;
  width: 120px;
  height: 100%;
  min-height: 0;
  display: flex;
  justify-content: center;
  align-self: stretch;
  margin: 0;
}

.equiv-slider-wrap--highlight .equiv-slider-track {
  box-shadow: 0 0 24px rgba(52, 152, 219, 0.65);
}

.equiv-slider-track {
  position: absolute;
  left: 50%;
  top: 44px;
  bottom: 4px;
  transform: translateY(20px);
  width: 6px;
  margin-left: -3px;
  background: linear-gradient(180deg, var(--color-blue-light), var(--color-blue-base));
  border-radius: 4px;
  transition: box-shadow 0.3s ease;
}

.equiv-slider-tick {
  position: absolute;
  left: 50%;
  width: 0;
  transform: translateX(-50%);
  height: 36px;
}

.equiv-slider-tick-line {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 4px;
  width: 28px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 2px;
}

.equiv-slider-bottom-tick {
  position: absolute;
  left: 50%;
  bottom: 72px;
  transform: translateX(-50%);
  height: 4px;
  width: 28px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 2px;
}

.equiv-slider-tick-num {
  position: absolute;
  right: 54px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 44px;
  font-weight: 700;
  color: var(--color-blue-light);
  min-width: 48px;
  text-align: right;
  opacity: 1;
  transition: color 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

.equiv-slider-tick-num--active {
  color: var(--color-correct-base);
  font-size: 66px;
}

.equiv-slider-tick-num--zero-active {
  transform: translateY(calc(-50% - 20px));
  transition: none;
  animation: none !important;
}

.equiv-slider-tick-num--dim {
  color: rgba(94, 178, 231, 0.45);
  opacity: 0.6;
}

.equiv-slider-tick-num--pulse {
  animation: tickPulse 0.9s ease-in-out infinite;
}

@keyframes tickPulse {
  0%,
  100% {
    transform: translateY(-50%) scale(1);
  }
  50% {
    transform: translateY(-50%) scale(1.08);
  }
}

.equiv-knife {
  position: absolute;
  left: 50%;
  width: 72px;
  height: 40px;
  margin-left: -36px;
  cursor: grab;
  z-index: 5;
  touch-action: none;
  filter: drop-shadow(2px 4px 4px rgba(0, 0, 0, 0.45));
  transition: transform 0.15s ease;
}

.equiv-knife--locked {
  cursor: default;
}

.equiv-knife--hidden {
  opacity: 0;
  pointer-events: none;
}

.equiv-knife--fly {
  transition: transform 0.9s cubic-bezier(0.45, 0, 0.2, 1), left 0.9s cubic-bezier(0.45, 0, 0.2, 1),
    top 0.9s cubic-bezier(0.45, 0, 0.2, 1);
}

.equiv-slider-swipe {
  position: absolute;
  width: 84px;
  height: 84px;
  left: calc(50% + 38px);
  transform: translateY(-50%);
  object-fit: contain;
  pointer-events: none;
  z-index: 6;
  filter: drop-shadow(2px 4px 4px rgba(0, 0, 0, 0.4));
  animation: sliderSwipeHint 1.2s ease-in-out infinite;
}

@keyframes sliderSwipeHint {
  0%,
  100% {
    transform: translateY(-50%) translateY(0);
    opacity: 0.85;
  }
  50% {
    transform: translateY(-50%) translateY(-12px);
    opacity: 1;
  }
}

.equiv-whole-btn {
  align-self: center;
  width: 100%;
  max-width: 280px;
  padding: 16px 12px;
  border-radius: 14px;
  border: 2px solid rgba(255, 255, 255, 0.55);
  background: linear-gradient(180deg, var(--color-orange-light), var(--color-orange-base));
  color: var(--color-white-base);
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  cursor: default;
  box-shadow: none;
  transition: none;
}

.equiv-whole-btn--pulse {
  animation: none;
}

@keyframes wholePulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 4px 0 var(--color-orange-dark), 0 6px 16px rgba(0, 0, 0, 0.35);
  }
  50% {
    transform: scale(1.04);
    box-shadow: 0 4px 0 var(--color-orange-dark), 0 0 28px rgba(255, 159, 26, 0.55);
  }
}

.equiv-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  width: 100%;
}

.equiv-equals-big {
  font-size: 72px;
  font-weight: 300;
  color: #b0b0b0;
  width: 56px;
  text-align: center;
  flex-shrink: 0;
}

.equiv-equals-big--dim {
  color: #5a5a5a;
}

.equiv-equals-big--pulse {
  animation: eqPulse 1s ease-in-out infinite;
}

@keyframes eqPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.12);
    opacity: 0.85;
  }
}

.equiv-col {
  width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  position: relative;
}

.equiv-badges {
  position: absolute;
  top: -54px;
  left: 0;
  z-index: 3;
  display: flex;
  justify-content: space-around;
  gap: 0;
  min-height: 0;
  flex-wrap: nowrap;
  width: 100%;
  max-width: 360px;
  pointer-events: none;
}

.equiv-badge {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  color: #333;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}

.equiv-badge--active {
  background: var(--color-correct-base);
  color: #fff;
}

.equiv-clay-stack {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: center;
  height: 200px;
  width: 100%;
  max-width: 360px;
}

.equiv-clay-stack--teeter {
  animation: teeter 0.5s ease-in-out;
}

@keyframes teeter {
  0% {
    transform: rotate(0deg);
  }
  20% {
    transform: rotate(-6deg);
  }
  40% {
    transform: rotate(6deg);
  }
  60% {
    transform: rotate(-4deg);
  }
  80% {
    transform: rotate(3deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

.equiv-clay-seg {
  flex: 1;
  min-width: 0;
  border-radius: 10px;
  background-color: rgba(0, 0, 0, 0);
  background-image: url('../assets/images/image.png');
  background-size: 100% 125%;
  background-position: center top;
  background-repeat: no-repeat;
  box-shadow: none;
  border: none;
  cursor: pointer;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.equiv-clay-stack--selectable .equiv-clay-seg:hover {
  filter: brightness(1.08);
}

.equiv-clay-seg + .equiv-clay-seg {
  border-left: none;
}

.equiv-clay-stack--two .equiv-clay-seg {
  border: none;
  box-shadow: none;
}

.equiv-clay-stack--two .equiv-clay-seg + .equiv-clay-seg {
  border-left: none;
}

.equiv-clay-seg--selected {
  box-shadow: none;
  filter: drop-shadow(0 0 12px rgba(33, 145, 80, 0.8)) drop-shadow(0 0 24px rgba(33, 145, 80, 0.45));
  z-index: 2;
  transform: scale(1.04) translateY(-4px);
}

.equiv-clay-seg--pulse {
  animation: segPulse 1s ease-in-out infinite;
}

@keyframes segPulse {
  0%,
  100% {
    transform: scale(1.04) translateY(-4px);
  }
  50% {
    transform: scale(1.08) translateY(-8px);
  }
}

.equiv-clay-whole {
  width: 100%;
  max-width: 360px;
  height: 200px;
  background-color: rgba(0, 0, 0, 0);
  background-image: url('../assets/images/image.png');
  background-size: 100% 125%;
  background-position: center top;
  background-repeat: no-repeat;
  border: none;
  border-radius: 0;
  box-shadow: none;
}

.equiv-clay-whole--green {
  box-shadow: none;
  filter: drop-shadow(0 0 14px rgba(33, 145, 80, 0.85)) drop-shadow(0 0 26px rgba(33, 145, 80, 0.5));
}

.equiv-clay-whole--pulse {
  animation: wholeClayPulse 1s ease-in-out infinite;
}

.equiv-block-slot--pulse .equiv-clay-whole,
.equiv-block-slot--pulse .equiv-clay-stack {
  animation: wholeClayPulse 1s ease-in-out infinite;
}

@keyframes wholeClayPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.03);
  }
}

.equiv-block-slot--dim .equiv-clay-whole,
.equiv-block-slot--dim .equiv-clay-stack,
.equiv-block-slot--dim .equiv-ghost-num {
  opacity: 1;
  filter: none;
}

.equiv-block-slot--dim .equiv-badges .equiv-badge {
  opacity: 0.4;
}

.equiv-ghost-num {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.12);
  pointer-events: none;
  transform: translateY(-15px);
}

.equiv-fraction-row {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
  margin-top: 0;
  min-height: 100px;
}

.equiv-frac-slot {
  width: 380px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 130px;
}

.equiv-frac-slot--equals {
  width: 56px;
  flex: 0 0 56px;
  align-items: center;
}

.equiv-frac-box {
  min-width: 100px;
  padding: 10px 22px;
  border-radius: 16px;
  border: 3px solid var(--color-blue-base);
  background: rgba(0, 0, 0, 0.2);
  font-size: 59px;
  font-weight: 700;
  color: #fff;
  text-align: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.equiv-frac-num,
.equiv-frac-den {
  min-width: 46px;
}

.equiv-frac-bar {
  width: 100%;
  min-width: 56px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.95);
  margin: 6px 0 7px;
}

.equiv-frac-box--equals {
  border-color: var(--color-yellow-base);
  font-size: 40px;
  padding: 10px 20px;
}

.equiv-frac-box--pulse {
  animation: fracPulse 1s ease-in-out infinite;
}

@keyframes fracPulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: none;
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 159, 26, 0.5);
  }
}

.equiv-tap-finger {
  position: absolute;
  width: 72px;
  height: 72px;
  pointer-events: none;
  z-index: 10;
  object-fit: contain;
  transform: translate(-50%, -50%);
  filter: drop-shadow(2px 4px 4px rgba(0, 0, 0, 0.4));
  animation: handNudge 1.2s ease-in-out infinite;
}

@keyframes handNudge {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(-6px, 4px);
  }
}

.equiv-multiplier {
  position: absolute;
  top: -8px;
  right: 8px;
  padding: 6px 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #b77fd0, var(--color-purple-base));
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.35);
}

.equiv-multiplier--top {
  position: static;
  padding: 10px 22px;
  font-size: 44px;
  border-radius: 16px;
  line-height: 1;
}

.equiv-multiplier .m-x {
  color: #fff;
}

.equiv-multiplier .m-n2 {
  color: var(--color-pink-base);
}

.equiv-multiplier .m-n3 {
  color: var(--color-orange-base);
}

.equiv-dashed-wrap {
  position: absolute;
  top: 0;
  bottom: auto;
  height: 70%;
  border: 3px dashed rgba(255, 255, 255, 0.75);
  border-radius: 14px;
  pointer-events: none;
  z-index: 1;
}

.equiv-dashed-wrap--pulse {
  animation: dashPulse 1s ease-in-out infinite;
}

@keyframes dashPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.55;
  }
}

.equiv-block-slot {
  position: relative;
  width: 100%;
  max-width: 360px;
  min-height: 244px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  background: transparent;
}

.equiv-frac-row-inner {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
  flex-wrap: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .equiv-knife--fly,
  .equiv-clay-seg,
  .equiv-clay-whole,
  .equiv-slider-tick-num--pulse,
  .equiv-whole-btn--pulse,
  .equiv-equals-big--pulse,
  .equiv-clay-seg--pulse,
  .equiv-clay-whole--pulse,
  .equiv-block-slot--pulse .equiv-clay-whole,
  .equiv-block-slot--pulse .equiv-clay-stack,
  .equiv-frac-box--pulse,
  .equiv-tap-finger,
  .equiv-dashed-wrap--pulse {
    animation: none !important;
    transition: none !important;
  }
}