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*,
::before,
::after {
  box-sizing: border-box;
}

body,
h1,
h2,
h3,
p,
ul,
ol {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

html {
  -webkit-text-size-adjust: 100%;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  background: #f6f3ea;
  color: #1f2328;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  font-size: 15px;
  line-height: 24px;
  -webkit-font-smoothing: antialiased;
}

button {
  background: transparent;
  border: 0;
  color: inherit;
  font-family: inherit;
  cursor: pointer;
}

input,
select {
  color: inherit;
  font-family: inherit;
}

.PolynomialEditor {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

.Stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: calc(56px + 16px) 24px 88px;
}
.Stage-Frame {
  position: relative;
  flex-shrink: 0;
  width: min(720px, 100%);
}
.Stage-Arrow {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: visible;
  pointer-events: none;
}
.Stage-Body {
  position: relative;
  z-index: 2;
}
.Stage-Note {
  position: relative;
  min-height: 48px;
  margin-top: 12px;
  padding: 11px calc(14px + 4px) calc(11px - 4.5px) calc(14px + 4px);
  background: #f2ead8;
  border-radius: 2px;
}
.Stage-Note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: #9a7b42;
}
.Stage [data-highlight] {
  background: var(--highlight-color);
  border-radius: 2px;
  box-shadow: 0 0 0 0.13em var(--highlight-color);
}
.Stage [data-pop] {
  display: inline-block;
  animation: polynomial-pop 0.5s cubic-bezier(0.2, 0.9, 0.3, 1.25);
}

.ExpandLine {
  overflow-x: auto;
  padding: 6px 2px;
  font-size: clamp(20px, 5vw, 27px);
  white-space: nowrap;
}
.ExpandLine[data-equation] {
  font-size: clamp(18px, 4.4vw, 24px);
}
.ExpandLine[data-room] {
  padding-top: 52px;
  padding-bottom: 50px;
}
.ExpandLine[data-hidden] {
  display: none;
}
.ExpandLine[data-final] > .katex {
  display: inline-block;
  padding: 4px 12px;
  background: #fbf0ec;
  border: 2px solid #b4452f;
  border-radius: 2px;
  animation: polynomial-pop 0.5s cubic-bezier(0.2, 0.9, 0.3, 1.25);
}

.Logo {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 24px;
}
.Logo a {
  color: #1f2328;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.PanelControl {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 56px;
  padding: 0 28px;
}
.PanelControl-Item {
  display: flex;
  align-items: center;
  color: #5c6370;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}
.PanelControl-Item[data-open] {
  color: #1f2328;
}

.PanelColumn {
  position: absolute;
  left: 0;
  top: 56px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.Panel {
  position: relative;
  display: flex;
  flex-direction: column;
  width: max-content;
  max-height: calc(100vh - 56px);
  background: #fffdf7;
  border: 1px solid #e7dfcd;
  border-radius: 12px 8px 8px 8px;
  overflow: hidden;
}
.Panel[data-panel]:not([data-open]) {
  display: none;
}
.Panel[data-float] {
  position: fixed;
}
.Panel-Header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 32px;
  cursor: grab;
  user-select: none;
}
.Panel-Header:active {
  cursor: grabbing;
}
.Panel-Title {
  display: flex;
  align-items: center;
  height: 32px;
  padding: 0 16px;
  background: #ebe3d0;
  border-bottom-right-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}
.Panel-CloseIcon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: #5c6370;
  cursor: pointer;
}
.Panel-CloseIcon svg {
  visibility: hidden;
}
.Panel-CloseIcon:hover svg {
  visibility: visible;
}
.Panel-Main {
  flex: 1;
  min-height: 0;
  padding: 8px 10px;
  overflow-y: scroll;
  overscroll-behavior-y: none;
  scrollbar-width: none;
}
.Panel-Handle {
  position: absolute;
}
.Panel-Handle[data-direction=n] {
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  cursor: ns-resize;
}
.Panel-Handle[data-direction=s] {
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  cursor: ns-resize;
}
.Panel-Handle[data-direction=e] {
  top: 0;
  right: 0;
  bottom: 0;
  width: 6px;
  cursor: ew-resize;
}
.Panel-Handle[data-direction=w] {
  top: 0;
  left: 0;
  bottom: 0;
  width: 6px;
  cursor: ew-resize;
}
.Panel-Handle[data-direction=ne] {
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  cursor: nesw-resize;
}
.Panel-Handle[data-direction=nw] {
  top: 0;
  left: 0;
  width: 12px;
  height: 12px;
  cursor: nwse-resize;
}
.Panel-Handle[data-direction=se] {
  bottom: 0;
  right: 0;
  width: 12px;
  height: 12px;
  cursor: nwse-resize;
}
.Panel-Handle[data-direction=sw] {
  bottom: 0;
  left: 0;
  width: 12px;
  height: 12px;
  cursor: nesw-resize;
}

.PolynomialEditor[data-fixed] .Panel {
  position: fixed;
  top: 56px;
  right: 0;
  left: auto;
}
.PolynomialEditor[data-fixed] .Panel-Header {
  cursor: default;
}

.PresetList {
  display: flex;
  flex-direction: column;
  min-width: 200px;
}
.PresetList-Item {
  display: block;
  width: 100%;
  padding: 6px 10px;
  border-radius: 2px;
  color: #1f2328;
  font-size: 14px;
  line-height: 1.7;
  text-align: left;
  white-space: nowrap;
  user-select: none;
}
.PresetList-Item:hover {
  background: #f3ecdd;
}
.PresetList-Item[data-on] {
  background: #eae0c9;
}

.StageControl {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 16px 24px;
}
.StageControl-Button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 2px;
  color: #1f2328;
}
.StageControl-Button:hover {
  background: #f3ecdd;
}
.StageControl-Button[data-primary] {
  background: #eae0c9;
}
.StageControl-Button:disabled {
  opacity: 0.3;
  cursor: default;
}
.StageControl-Button:disabled:hover {
  background: transparent;
}
.StageControl-Icon {
  display: block;
  flex-shrink: 0;
}
.StageControl-Progress {
  min-width: 60px;
  color: #5c6370;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
}
.StageControl .StepperInput {
  margin-left: 12px;
}

.StepperInput {
  display: flex;
  align-items: center;
  gap: 4px;
}
.StepperInput-Arrow {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 2px;
  color: #5c6370;
  cursor: pointer;
}
.StepperInput-Arrow:hover {
  background: #f3ecdd;
}
.StepperInput-Arrow[data-disabled] {
  opacity: 0.3;
  cursor: default;
}
.StepperInput-Arrow[data-disabled]:hover {
  background: transparent;
}
.StepperInput-Track {
  display: grid;
  justify-items: center;
  min-width: 72px;
}
.StepperInput-Option {
  grid-area: 1/1;
  visibility: hidden;
  color: #1f2328;
  font-size: 13px;
  line-height: 1.5;
  white-space: nowrap;
  user-select: none;
}
.StepperInput-Option[data-selected] {
  visibility: visible;
}

.SummaryBox {
  display: none;
  margin-top: 12px;
  padding: 12px 15px;
  background: #fffae8;
  border: 1px solid #f0dfa6;
  border-radius: 2px;
}
.SummaryBox[data-open] {
  display: block;
}
.SummaryBox-Label {
  margin-bottom: 6px;
  color: #5c6370;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.SummaryBox-Formula {
  overflow-x: auto;
  font-size: clamp(17px, 4.2vw, 22px);
}

@keyframes polynomial-pop {
  0% {
    transform: scale(0.2);
    opacity: 0;
  }
  70% {
    transform: scale(1.22);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .Stage [data-pop],
  .ExpandLine[data-final] > .katex {
    animation: none;
  }
}
.HintPanel {
  width: 400px;
  max-height: calc(100vh - 56px);
}
.HintPanel .Panel-Main {
  padding: 0;
}

.Article {
  width: 100%;
  color: #5c6370;
}
.Article h1 {
  margin: 21px 0;
  padding: 0 24px;
  color: #1f2328;
  font-size: 17px;
  line-height: 25px;
  font-weight: 600;
}
.Article strong {
  color: #1f2328;
  font-weight: 600;
}
.Article .katex-display {
  margin: 0;
}
.Article-Heading {
  padding-left: 24px;
  padding-right: 24px;
  padding-top: 3px;
  padding-bottom: 3px;
  margin: 33px 0 21px;
  color: #1f2328;
  font-size: 18px;
  line-height: 1.5;
  font-weight: 500;
}
.Article-Body {
  margin: 21px 0;
  padding-left: 24px;
  padding-right: 24px;
  padding-top: 3px;
  padding-bottom: 3px;
  font-size: 15px;
  line-height: 1.8;
}
.Article-Math {
  overflow-x: auto;
  margin: 15px 0;
  padding: 6px 24px;
  color: #1f2328;
  font-size: 14px;
}