.dekinai-theory {
  --dk-red: #e21e2f;
  --dk-dark-red: #71000a;
  --dk-ink: #060606;
  --dk-paper: #f0ece3;
  --dk-muted: rgba(240, 236, 227, 0.6);
  --dk-line: rgba(240, 236, 227, 0.16);
  --dk-pointer-x: 0px;
  --dk-pointer-y: 0px;
  --dk-progress: 0;
  position: relative;
  z-index: 1;
  isolation: isolate;
  overflow: clip;
  background:
    radial-gradient(circle at 8% 14%, rgba(226, 30, 47, 0.14), transparent 25%),
    radial-gradient(circle at 88% 63%, rgba(105, 0, 10, 0.18), transparent 25%),
    linear-gradient(155deg, #0b0b0b 0%, #050505 52%, #0b0808 100%);
  color: var(--dk-paper);
  font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  overflow-wrap: break-word;
  word-break: normal;
  line-break: strict;
}

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

.dekinai-atmosphere {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.dekinai-atmosphere::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.16;
  background:
    repeating-linear-gradient(112deg, transparent 0 72px, rgba(255, 255, 255, 0.05) 73px 74px),
    linear-gradient(90deg, transparent, rgba(226, 30, 47, 0.08), transparent);
  mask-image: linear-gradient(to bottom, #000, transparent 93%);
}

.dekinai-atmosphere::after {
  content: "IMPOSSIBLE?";
  position: absolute;
  top: 4%;
  right: -5vw;
  color: transparent;
  font: 900 clamp(6rem, 20vw, 19rem)/0.75 Arial, sans-serif;
  letter-spacing: -0.09em;
  white-space: nowrap;
  -webkit-text-stroke: 1px rgba(240, 236, 227, 0.035);
  transform: rotate(90deg) translateX(60%);
  transform-origin: right top;
}

.dekinai-atmosphere i {
  position: absolute;
  display: block;
  border: 1px solid rgba(226, 30, 47, 0.1);
  transform: translate3d(var(--dk-pointer-x), var(--dk-pointer-y), 0) rotate(45deg);
  transition: transform 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-atmosphere i:nth-child(1) {
  top: 9%;
  left: -13vw;
  width: 26vw;
  aspect-ratio: 1;
}

.dekinai-atmosphere i:nth-child(2) {
  top: 48%;
  right: -20vw;
  width: 40vw;
  aspect-ratio: 1;
  transform: translate3d(calc(0px - var(--dk-pointer-x)), var(--dk-pointer-y), 0) rotate(45deg);
}

.dekinai-atmosphere i:nth-child(3) {
  bottom: 4%;
  left: 18%;
  width: 12vw;
  aspect-ratio: 1;
  transform: translate3d(var(--dk-pointer-x), calc(0px - var(--dk-pointer-y)), 0) rotate(45deg);
}

.dekinai-progress {
  position: absolute;
  top: 3rem;
  left: clamp(1rem, 2.5vw, 2.8rem);
  bottom: 3rem;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  color: rgba(240, 236, 227, 0.3);
  font: 700 0.55rem/1 Arial, sans-serif;
  letter-spacing: 0.16em;
  pointer-events: none;
}

.dekinai-progress b {
  position: relative;
  flex: 1;
  width: 1px;
  overflow: hidden;
  background: rgba(240, 236, 227, 0.14);
}

.dekinai-progress b::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(var(--dk-red), rgba(226, 30, 47, 0.05));
  transform: scaleY(var(--dk-progress));
  transform-origin: top;
}

.dekinai-scene {
  position: relative;
  width: min(100%, 1440px);
  min-height: 100svh;
  margin: 0 auto;
  padding: clamp(7rem, 10vw, 11rem) clamp(2rem, 8.5vw, 9rem);
  border-top: 1px solid var(--dk-line);
}

.dekinai-scene:first-of-type {
  border-top: 0;
}

.dekinai-scene::before {
  content: "";
  position: absolute;
  top: 0;
  right: clamp(2rem, 8.5vw, 9rem);
  width: 0;
  height: 1px;
  background: var(--dk-red);
  transition: width 1.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-scene.dekinai-seen::before {
  width: min(20rem, 36vw);
}

.dekinai-opening {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(330px, 0.72fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
  min-height: max(100svh, 760px);
}

.dekinai-overline,
.dekinai-chapter-head,
.dekinai-point-number {
  font-family: Arial, Helvetica, sans-serif;
  text-transform: uppercase;
}

.dekinai-overline {
  margin: 0 0 2.5rem;
  color: var(--dk-red);
  font-size: clamp(0.64rem, 0.78vw, 0.78rem);
  font-weight: 800;
  letter-spacing: 0.25em;
}

.dekinai-opening h2 {
  max-width: 12em;
  margin: 0;
  font-size: clamp(2.8rem, 6.5vw, 6.8rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.065em;
  text-wrap: balance;
}

.dekinai-opening-impact {
  margin: clamp(2rem, 5vw, 4.2rem) 0 0;
  color: var(--dk-red);
  font-size: clamp(2rem, 4.7vw, 5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.055em;
}

.dekinai-wall {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  width: min(35vw, 440px);
  aspect-ratio: 1.06;
  margin-inline: auto;
  perspective: 700px;
}

.dekinai-wall > span {
  border: 1px solid rgba(240, 236, 227, 0.24);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.005));
  transform: translate3d(0, 0, 0);
  transition: transform 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-wall > span:nth-child(2),
.dekinai-wall > span:nth-child(5) {
  background: linear-gradient(145deg, rgba(226, 30, 47, 0.12), rgba(255, 255, 255, 0.01));
}

.dekinai-seen .dekinai-wall > span:nth-child(1) { transform: translate3d(-12px, -7px, 28px) rotate(-2deg); }
.dekinai-seen .dekinai-wall > span:nth-child(2) { transform: translate3d(-4px, -14px, 42px) rotate(2deg); }
.dekinai-seen .dekinai-wall > span:nth-child(3) { transform: translate3d(10px, -5px, 20px) rotate(1deg); }
.dekinai-seen .dekinai-wall > span:nth-child(4) { transform: translate3d(-9px, 8px, 17px) rotate(1deg); }
.dekinai-seen .dekinai-wall > span:nth-child(5) { transform: translate3d(5px, 16px, 48px) rotate(-3deg); }
.dekinai-seen .dekinai-wall > span:nth-child(6) { transform: translate3d(13px, 6px, 24px) rotate(2deg); }

.dekinai-wall > i {
  position: absolute;
  top: 48%;
  left: 49%;
  z-index: 3;
  width: 36%;
  height: 2px;
  background: var(--dk-red);
  box-shadow: 0 0 18px rgba(226, 30, 47, 0.55);
  transform: rotate(var(--crack-angle, 0deg)) scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1) 350ms;
}

.dekinai-wall > i:nth-of-type(1) { --crack-angle: -48deg; }
.dekinai-wall > i:nth-of-type(2) { --crack-angle: 13deg; }
.dekinai-wall > i:nth-of-type(3) { --crack-angle: 61deg; }

.dekinai-seen .dekinai-wall > i {
  transform: rotate(var(--crack-angle, 0deg)) scaleX(1);
}

.dekinai-wall > b {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  color: rgba(240, 236, 227, 0.08);
  font: 900 clamp(5rem, 10vw, 9rem)/1 Arial, sans-serif;
  letter-spacing: -0.1em;
  transition:
    color 0.8s ease,
    transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-seen .dekinai-wall > b {
  color: rgba(226, 30, 47, 0.24);
  transform: scale(1.08);
}

.dekinai-chapter-head {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: clamp(3.5rem, 7vw, 6.5rem);
  color: var(--dk-red);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.25em;
}

.dekinai-chapter-head i {
  width: clamp(2rem, 6vw, 5rem);
  height: 1px;
  background: currentColor;
}

.dekinai-chapter-head small {
  color: var(--dk-muted);
  font: 500 0.78rem/1 "Noto Serif JP", serif;
  letter-spacing: 0.28em;
}

.dekinai-copy {
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  line-height: 2.1;
}

.dekinai-copy p {
  margin: 0 0 1.2em;
}

.dekinai-copy strong,
.dekinai-choice-copy strong,
.dekinai-epilogue-inner strong {
  color: var(--dk-red);
  font-weight: 800;
}

.dekinai-prologue {
  overflow: hidden;
}

.dekinai-prologue-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(360px, 1fr);
  align-items: center;
  gap: clamp(3rem, 9vw, 10rem);
}

.dekinai-prologue blockquote {
  display: grid;
  gap: 0.75rem;
  margin: 2rem 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid rgba(240, 236, 227, 0.24);
  color: var(--dk-muted);
}

.dekinai-question {
  padding: clamp(2rem, 4vw, 4rem);
  border: 1px solid rgba(226, 30, 47, 0.65);
  background:
    linear-gradient(125deg, rgba(226, 30, 47, 0.12), transparent 57%),
    rgba(6, 6, 6, 0.8);
}

.dekinai-question h3 {
  margin: 0 0 1rem;
  color: var(--dk-red);
  font-size: clamp(1.7rem, 3.6vw, 3.9rem);
  line-height: 1.4;
  letter-spacing: -0.04em;
}

.dekinai-question p {
  margin: 0;
  color: var(--dk-muted);
  font-size: clamp(0.95rem, 1.35vw, 1.18rem);
}

.dekinai-question-mark {
  position: absolute;
  right: -2vw;
  bottom: -8vw;
  width: min(36vw, 510px);
  aspect-ratio: 1;
  opacity: 0.23;
  pointer-events: none;
  transform: rotate(-20deg) scale(0.7);
  transition:
    opacity 1s ease,
    transform 1.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-seen .dekinai-question-mark {
  opacity: 0.6;
  transform: rotate(0deg) scale(1);
}

.dekinai-question-mark span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: transparent;
  font: 900 min(28vw, 25rem)/1 Arial, sans-serif;
  -webkit-text-stroke: 1px rgba(226, 30, 47, 0.7);
}

.dekinai-question-mark i {
  position: absolute;
  inset: 10%;
  border: 1px dashed rgba(240, 236, 227, 0.2);
  border-radius: 50%;
}

.dekinai-active .dekinai-question-mark i {
  animation: dekinai-turn 16s linear infinite;
}

.dekinai-point {
  min-height: max(100svh, 800px);
}

.dekinai-point-number {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: clamp(4rem, 7vw, 6.5rem);
}

.dekinai-point-number span {
  color: var(--dk-red);
  font: 300 clamp(3.4rem, 7vw, 6rem)/1 Arial, sans-serif;
  letter-spacing: -0.08em;
}

.dekinai-point-number small {
  color: rgba(240, 236, 227, 0.38);
  font: 700 0.62rem/1 Arial, sans-serif;
  letter-spacing: 0.2em;
}

.dekinai-point-grid,
.dekinai-limit-grid,
.dekinai-method-grid,
.dekinai-reasons-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.72fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
}

.dekinai-point-one .dekinai-copy h3 {
  margin: 1.5rem 0 3rem;
  font-size: clamp(2rem, 4.5vw, 4.7rem);
  font-style: normal;
  line-height: 1.45;
  letter-spacing: -0.05em;
}

.dekinai-point-one .dekinai-copy h3 strong {
  color: var(--dk-red);
}

.dekinai-point-one .dekinai-copy h3 em {
  color: var(--dk-paper);
  font-style: normal;
}

.dekinai-black-box {
  position: relative;
  margin: clamp(2rem, 4vw, 3.5rem) 0;
  padding: clamp(1.7rem, 4vw, 3.3rem);
  border-left: 3px solid var(--dk-red);
  background:
    linear-gradient(110deg, rgba(226, 30, 47, 0.12), transparent 65%),
    #020202;
  color: var(--dk-paper);
  font-size: clamp(1.25rem, 2.5vw, 2.35rem);
  font-weight: 750;
  line-height: 1.55;
}

.dekinai-black-box p {
  margin: 0 0 0.4rem;
  color: var(--dk-muted);
  font-size: 0.62em;
  font-weight: 500;
}

.dekinai-divide {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: min(31vw, 410px);
  aspect-ratio: 0.96;
  margin-inline: auto;
  border: 1px solid rgba(240, 236, 227, 0.18);
  overflow: hidden;
}

.dekinai-divide > span {
  display: grid;
  place-items: center;
  color: rgba(240, 236, 227, 0.25);
  font: 900 clamp(1rem, 2.1vw, 1.9rem)/1 Arial, sans-serif;
  letter-spacing: -0.04em;
  writing-mode: vertical-rl;
}

.dekinai-divide > span:last-of-type {
  color: var(--dk-red);
}

.dekinai-divide > i {
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  background: var(--dk-red);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-seen .dekinai-divide > i {
  transform: scaleY(1);
}

.dekinai-divide > b {
  position: absolute;
  top: calc(50% - 6px);
  left: calc(50% - 6px);
  width: 12px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--dk-red);
  box-shadow: 0 0 24px rgba(226, 30, 47, 0.8);
  opacity: 0;
  transform: scale(0);
  transition:
    opacity 0.5s ease 850ms,
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 850ms;
}

.dekinai-seen .dekinai-divide > b {
  opacity: 1;
  transform: scale(1);
}

.dekinai-framed {
  position: relative;
  display: block;
  margin: 2.5rem 0;
  padding: clamp(1.6rem, 3.5vw, 3rem);
  border: 1px solid rgba(226, 30, 47, 0.68);
  color: var(--dk-red);
  font-size: clamp(1.8rem, 3.8vw, 4rem);
  line-height: 1.35;
}

.dekinai-framed::after {
  content: "";
  position: absolute;
  inset: 0.4rem;
  border: 1px solid rgba(226, 30, 47, 0.17);
}

.dekinai-limit-question {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(240, 236, 227, 0.18);
}

.dekinai-limit-question strong {
  display: block;
  color: var(--dk-red);
  font-size: clamp(1.6rem, 3.3vw, 3.4rem);
  line-height: 1.4;
}

.dekinai-lock {
  position: relative;
  width: min(28vw, 370px);
  aspect-ratio: 0.88;
  margin-inline: auto;
}

.dekinai-lock span {
  position: absolute;
  top: 5%;
  left: 22%;
  width: 56%;
  height: 55%;
  border: 2px solid rgba(240, 236, 227, 0.3);
  border-bottom: 0;
  border-radius: 50% 50% 0 0;
  transform: translateY(18%) rotate(0deg);
  transform-origin: right bottom;
  transition: transform 1.3s cubic-bezier(0.16, 1, 0.3, 1) 280ms;
}

.dekinai-seen .dekinai-lock span {
  transform: translateY(0) rotate(16deg);
}

.dekinai-lock i {
  position: absolute;
  right: 8%;
  bottom: 4%;
  left: 8%;
  height: 58%;
  border: 1px solid rgba(226, 30, 47, 0.55);
  background: linear-gradient(145deg, rgba(226, 30, 47, 0.12), transparent);
}

.dekinai-lock i::after {
  content: "";
  position: absolute;
  top: 28%;
  left: calc(50% - 4px);
  width: 8px;
  height: 35%;
  border-radius: 50% 50% 2px 2px;
  background: var(--dk-red);
}

.dekinai-lock b {
  position: absolute;
  right: 0;
  bottom: -1.5rem;
  color: rgba(240, 236, 227, 0.15);
  font: 900 3rem/1 Arial, sans-serif;
  letter-spacing: -0.06em;
}

.dekinai-methods {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(240, 236, 227, 0.18);
}

.dekinai-methods li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(240, 236, 227, 0.18);
}

.dekinai-methods li span {
  color: var(--dk-muted);
}

.dekinai-methods li strong {
  white-space: nowrap;
}

.dekinai-method-orbit {
  position: relative;
  width: min(30vw, 390px);
  aspect-ratio: 1;
  margin-inline: auto;
}

.dekinai-method-orbit::before,
.dekinai-method-orbit i {
  content: "";
  position: absolute;
  inset: 16%;
  border: 1px solid rgba(240, 236, 227, 0.2);
  border-radius: 50%;
}

.dekinai-method-orbit i {
  inset: 5%;
  border-style: dashed;
  border-color: rgba(226, 30, 47, 0.28);
}

.dekinai-active .dekinai-method-orbit i {
  animation: dekinai-turn 17s linear infinite;
}

.dekinai-method-orbit > span {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 4.7rem;
  aspect-ratio: 1;
  border: 1px solid rgba(240, 236, 227, 0.25);
  background: var(--dk-ink);
  color: var(--dk-muted);
  font-size: 0.76rem;
  opacity: 0;
  transform: scale(0.5);
  transition:
    opacity 0.6s ease,
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-method-orbit > span:nth-child(1) { top: 0; left: calc(50% - 2.35rem); }
.dekinai-method-orbit > span:nth-child(2) { top: calc(50% - 2.35rem); right: 0; transition-delay: 120ms; }
.dekinai-method-orbit > span:nth-child(3) { bottom: 0; left: calc(50% - 2.35rem); transition-delay: 240ms; }
.dekinai-method-orbit > span:nth-child(4) { top: calc(50% - 2.35rem); left: 0; transition-delay: 360ms; }

.dekinai-seen .dekinai-method-orbit > span {
  opacity: 1;
  transform: scale(1);
}

.dekinai-method-orbit b {
  position: absolute;
  inset: 37%;
  display: grid;
  place-items: center;
  border: 1px solid var(--dk-red);
  color: var(--dk-red);
  font: 800 1rem/1 Arial, sans-serif;
  letter-spacing: 0.1em;
  opacity: 0;
  transform: rotate(-45deg) scale(0.4);
  transition:
    opacity 0.6s ease 480ms,
    transform 1s cubic-bezier(0.16, 1, 0.3, 1) 480ms;
}

.dekinai-seen .dekinai-method-orbit b {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.dekinai-point-four .dekinai-copy > h3 {
  margin: 2rem 0 3rem;
  color: var(--dk-red);
  font-size: clamp(2rem, 4.4vw, 4.5rem);
  line-height: 1.3;
}

.dekinai-blocks {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  width: min(29vw, 370px);
  margin-inline: auto;
  padding: 2rem 0;
}

.dekinai-blocks span {
  display: grid;
  place-items: center;
  width: 100%;
  height: 3.2rem;
  border: 1px solid rgba(240, 236, 227, 0.2);
  background: rgba(240, 236, 227, 0.035);
  color: rgba(240, 236, 227, 0.45);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  transition:
    opacity 0.7s ease,
    transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-seen .dekinai-blocks span:nth-child(1) { opacity: 0.35; transform: translateX(-18%) rotate(-3deg); }
.dekinai-seen .dekinai-blocks span:nth-child(2) { opacity: 0.42; transform: translateX(10%) rotate(2deg); transition-delay: 100ms; }
.dekinai-seen .dekinai-blocks span:nth-child(3) { opacity: 0.35; transform: translateX(-8%) rotate(1deg); transition-delay: 200ms; }
.dekinai-seen .dekinai-blocks span:nth-child(4) { opacity: 0.42; transform: translateX(16%) rotate(-2deg); transition-delay: 300ms; }
.dekinai-seen .dekinai-blocks span:nth-child(5) { opacity: 0.35; transform: translateX(-13%) rotate(3deg); transition-delay: 400ms; }

.dekinai-blocks i {
  position: absolute;
  top: 50%;
  left: -8%;
  width: 116%;
  height: 2px;
  background: var(--dk-red);
  box-shadow: 0 0 20px rgba(226, 30, 47, 0.6);
  transform: rotate(-8deg) scaleX(0);
  transform-origin: left;
  transition: transform 1.1s cubic-bezier(0.16, 1, 0.3, 1) 420ms;
}

.dekinai-seen .dekinai-blocks i {
  transform: rotate(-8deg) scaleX(1);
}

.dekinai-choice-copy {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: auto;
  font-size: clamp(1rem, 1.4vw, 1.24rem);
  line-height: 2;
}

.dekinai-choice {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: clamp(1rem, 3vw, 2.5rem);
  margin: clamp(3rem, 7vw, 6rem) 0;
}

.dekinai-choice > div {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid rgba(240, 236, 227, 0.18);
  background: rgba(255, 255, 255, 0.025);
}

.dekinai-choice > div:last-child {
  border-color: rgba(226, 30, 47, 0.58);
  background: rgba(226, 30, 47, 0.075);
}

.dekinai-choice small {
  color: var(--dk-red);
  font: 800 0.62rem/1 Arial, sans-serif;
  letter-spacing: 0.2em;
}

.dekinai-choice p {
  margin: 1rem 0 0;
  color: var(--dk-paper);
  font-size: clamp(1.2rem, 2.1vw, 1.85rem);
  font-weight: 700;
  line-height: 1.65;
}

.dekinai-choice > i {
  width: 1px;
  background: rgba(240, 236, 227, 0.18);
}

.dekinai-choice-copy > h3 {
  margin: 0;
  color: var(--dk-red);
  font-size: clamp(2.4rem, 5.5vw, 5.8rem);
  line-height: 1.2;
  text-align: right;
}

.dekinai-fork {
  position: absolute;
  right: 5vw;
  bottom: 7%;
  width: min(31vw, 430px);
  height: 190px;
  opacity: 0.27;
  pointer-events: none;
}

.dekinai-fork i {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: rgba(240, 236, 227, 0.45);
  transform: rotate(var(--fork-angle, 0deg)) scaleX(0);
  transform-origin: left;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1) 260ms;
}

.dekinai-fork i:nth-child(2) { --fork-angle: -18deg; }
.dekinai-fork i:nth-child(3) { --fork-angle: 18deg; }

.dekinai-seen .dekinai-fork i {
  transform: rotate(var(--fork-angle, 0deg)) scaleX(1);
}

.dekinai-fork span,
.dekinai-fork b {
  position: absolute;
  top: calc(50% - 6px);
  width: 12px;
  aspect-ratio: 1;
  border-radius: 50%;
}

.dekinai-fork span { left: -6px; background: var(--dk-paper); }
.dekinai-fork b { right: -6px; background: var(--dk-red); box-shadow: 0 0 22px rgba(226, 30, 47, 0.8); }

.dekinai-only-question {
  position: relative;
  z-index: 2;
  width: min(100%, 900px);
  margin: auto;
  font-size: clamp(1rem, 1.45vw, 1.28rem);
  line-height: 2;
}

.dekinai-only-question .dekinai-black-box {
  margin-top: clamp(3rem, 7vw, 6rem);
  text-align: center;
}

.dekinai-only-question h3 {
  margin: 0 0 0.5rem;
  color: var(--dk-red);
  font-size: clamp(2rem, 5vw, 5.2rem);
  line-height: 1.3;
}

.dekinai-only-question .dekinai-black-box > strong {
  display: block;
  color: var(--dk-paper);
  font-size: clamp(1.15rem, 2.2vw, 2rem);
}

.dekinai-target {
  position: absolute;
  right: 5vw;
  bottom: 3vw;
  width: min(30vw, 410px);
  aspect-ratio: 1;
  opacity: 0.23;
  pointer-events: none;
}

.dekinai-target span {
  position: absolute;
  inset: var(--target-inset, 0);
  border: 1px solid rgba(240, 236, 227, 0.34);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.6);
  transition:
    opacity 0.7s ease,
    transform 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-target span:nth-child(1) { --target-inset: 0; }
.dekinai-target span:nth-child(2) { --target-inset: 18%; transition-delay: 120ms; }
.dekinai-target span:nth-child(3) { --target-inset: 36%; transition-delay: 240ms; }

.dekinai-seen .dekinai-target span {
  opacity: 1;
  transform: scale(1);
}

.dekinai-target i {
  position: absolute;
  top: 50%;
  left: -10%;
  width: 70%;
  height: 2px;
  background: var(--dk-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1) 500ms;
}

.dekinai-target i::after {
  content: "";
  position: absolute;
  top: -5px;
  right: 0;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--dk-red);
  border-right: 2px solid var(--dk-red);
  transform: rotate(45deg);
}

.dekinai-seen .dekinai-target i {
  transform: scaleX(1);
}

.dekinai-target b {
  position: absolute;
  inset: 42%;
  display: grid;
  place-items: center;
  color: var(--dk-red);
  font: 800 0.58rem/1 Arial, sans-serif;
  letter-spacing: 0.1em;
}

.dekinai-epilogue {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: max(100svh, 820px);
  overflow: hidden;
}

.dekinai-epilogue-inner {
  position: relative;
  z-index: 2;
  width: min(100%, 980px);
  margin: auto;
  color: var(--dk-muted);
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  line-height: 2.1;
  text-align: center;
}

.dekinai-epilogue-inner > h3 {
  margin: clamp(2.3rem, 5vw, 4.3rem) 0;
  color: var(--dk-red);
  font-size: clamp(3.2rem, 8vw, 8rem);
  line-height: 1;
}

.dekinai-final-frame {
  position: relative;
  margin: clamp(3rem, 7vw, 6rem) 0;
  padding: clamp(2rem, 5vw, 4.5rem);
  border: 1px solid rgba(226, 30, 47, 0.68);
  background: linear-gradient(120deg, rgba(226, 30, 47, 0.12), transparent);
}

.dekinai-final-frame::after {
  content: "";
  position: absolute;
  inset: 0.45rem;
  border: 1px solid rgba(226, 30, 47, 0.18);
}

.dekinai-final-frame p,
.dekinai-final-frame strong {
  position: relative;
  z-index: 1;
}

.dekinai-final-frame p {
  margin: 0 0 0.5rem;
}

.dekinai-final-frame strong {
  display: block;
  color: var(--dk-red);
  font-size: clamp(1.8rem, 4vw, 4.2rem);
  line-height: 1.4;
}

.dekinai-seal {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  width: max-content;
  margin: clamp(4rem, 8vw, 7rem) auto 0;
  writing-mode: vertical-rl;
}

.dekinai-seal span {
  color: rgba(240, 236, 227, 0.48);
  font-size: 0.75rem;
  letter-spacing: 0.38em;
}

.dekinai-seal b {
  display: grid;
  place-items: center;
  width: 3.4rem;
  aspect-ratio: 1;
  border: 1px solid var(--dk-red);
  color: var(--dk-red);
  font-size: 1.45rem;
}

.dekinai-cage {
  position: absolute;
  right: -5vw;
  bottom: -8vw;
  width: min(38vw, 540px);
  aspect-ratio: 1;
  opacity: 0.25;
  pointer-events: none;
}

.dekinai-cage span {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--cage-left, 10%);
  width: 1px;
  background: rgba(240, 236, 227, 0.6);
  transform: rotate(0deg);
  transform-origin: bottom;
  transition: transform 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-cage span:nth-child(1) { --cage-left: 10%; }
.dekinai-cage span:nth-child(2) { --cage-left: 36%; }
.dekinai-cage span:nth-child(3) { --cage-left: 62%; }
.dekinai-cage span:nth-child(4) { --cage-left: 88%; }

.dekinai-seen .dekinai-cage span:nth-child(1) { transform: rotate(-24deg); }
.dekinai-seen .dekinai-cage span:nth-child(2) { transform: rotate(-8deg); }
.dekinai-seen .dekinai-cage span:nth-child(3) { transform: rotate(8deg); }
.dekinai-seen .dekinai-cage span:nth-child(4) { transform: rotate(24deg); }

.dekinai-cage i {
  position: absolute;
  inset: 43%;
  border: 1px solid var(--dk-red);
  transform: rotate(45deg) scale(0);
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1) 420ms;
}

.dekinai-seen .dekinai-cage i {
  transform: rotate(45deg) scale(1);
}

.dekinai-motion-ready .dekinai-reveal {
  opacity: 0;
  transform: translate3d(0, 34px, 0);
  transition:
    opacity 0.8s ease,
    transform 1.05s cubic-bezier(0.16, 1, 0.3, 1);
}

.dekinai-motion-ready .dekinai-scene.dekinai-seen .dekinai-reveal {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.dekinai-split {
  font-kerning: normal;
}

.dekinai-split.dekinai-prepared .dekinai-char {
  display: inline-block;
  opacity: 0;
  transform: translate3d(-0.18em, 1.08em, 0) skewX(-8deg);
  transform-origin: left bottom;
  transition:
    opacity 0.56s ease,
    transform 0.84s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--dk-char-index) * 22ms + 110ms);
  will-change: transform, opacity;
}

.dekinai-scene.dekinai-seen .dekinai-split.dekinai-prepared .dekinai-char {
  opacity: 1;
  transform: translate3d(0, 0, 0) skewX(0deg);
  will-change: auto;
}

.is-page-hidden .dekinai-theory *,
.dekinai-theory.performance-offscreen * {
  animation-play-state: paused !important;
}

@keyframes dekinai-turn {
  to { transform: rotate(360deg); }
}

@media (max-width: 900px) {
  .dekinai-progress {
    display: none;
  }

  .dekinai-scene {
    min-height: auto;
    padding: 6.8rem clamp(1.25rem, 6vw, 3.5rem);
  }

  .dekinai-opening {
    grid-template-columns: 1fr;
    min-height: 92svh;
    padding-top: 8.5rem;
    padding-bottom: 7.5rem;
  }

  .dekinai-opening h2 {
    font-size: clamp(2.7rem, 10.8vw, 5rem);
  }

  .dekinai-wall {
    width: min(76vw, 390px);
  }

  .dekinai-prologue-grid,
  .dekinai-point-grid,
  .dekinai-limit-grid,
  .dekinai-method-grid,
  .dekinai-reasons-grid {
    grid-template-columns: 1fr;
  }

  .dekinai-question-mark,
  .dekinai-fork,
  .dekinai-target,
  .dekinai-cage {
    opacity: 0.14;
  }

  .dekinai-divide,
  .dekinai-lock,
  .dekinai-method-orbit,
  .dekinai-blocks {
    width: min(76vw, 360px);
    margin-top: 2.5rem;
  }

  .dekinai-choice {
    grid-template-columns: 1fr;
  }

  .dekinai-choice > i {
    width: 100%;
    height: 1px;
  }

  .dekinai-choice-copy > h3 {
    text-align: left;
  }
}

@media (max-width: 520px) {
  .dekinai-scene {
    padding-inline: max(1.15rem, env(safe-area-inset-left));
  }

  .dekinai-chapter-head {
    gap: 0.65rem;
    margin-bottom: 3.7rem;
  }

  .dekinai-chapter-head i {
    width: 1.6rem;
  }

  .dekinai-opening h2 {
    font-size: clamp(2.35rem, 10.7vw, 3.5rem);
    line-height: 1.22;
  }

  .dekinai-opening-impact {
    font-size: clamp(1.95rem, 9.5vw, 3rem);
  }

  .dekinai-copy,
  .dekinai-choice-copy,
  .dekinai-only-question,
  .dekinai-epilogue-inner {
    font-size: 1rem;
    line-height: 2;
  }

  .dekinai-question {
    padding: 1.5rem 1.15rem;
  }

  .dekinai-question h3 {
    font-size: clamp(1.45rem, 7.5vw, 2.15rem);
  }

  .dekinai-point-number {
    margin-bottom: 3.4rem;
  }

  .dekinai-point-number span {
    font-size: 3.2rem;
  }

  .dekinai-point-one .dekinai-copy h3 {
    font-size: clamp(1.8rem, 8.5vw, 2.6rem);
  }

  .dekinai-black-box {
    padding: 1.55rem 1.15rem;
    font-size: clamp(1.15rem, 6vw, 1.7rem);
  }

  .dekinai-framed {
    padding: 1.5rem 1.1rem;
    font-size: clamp(1.5rem, 7.4vw, 2.2rem);
  }

  .dekinai-limit-question strong {
    font-size: clamp(1.5rem, 7.4vw, 2.2rem);
  }

  .dekinai-methods li {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .dekinai-point-four .dekinai-copy > h3 {
    font-size: clamp(1.8rem, 8.5vw, 2.7rem);
  }

  .dekinai-choice p {
    font-size: 1.15rem;
  }

  .dekinai-choice-copy > h3 {
    font-size: clamp(2.2rem, 10vw, 3.3rem);
  }

  .dekinai-only-question h3 {
    font-size: clamp(1.75rem, 8.5vw, 2.8rem);
  }

  .dekinai-epilogue-inner > h3 {
    font-size: clamp(3.1rem, 16vw, 5rem);
  }

  .dekinai-final-frame {
    padding: 2.2rem 1.1rem;
  }

  .dekinai-final-frame strong {
    font-size: clamp(1.55rem, 7.4vw, 2.3rem);
  }

  .dekinai-motion-ready .dekinai-reveal {
    transform: translate3d(0, 22px, 0);
  }

  .dekinai-split.dekinai-prepared .dekinai-char {
    transform: translate3d(-0.08em, 0.78em, 0) skewX(-5deg);
    transition-delay: calc(var(--dk-char-index) * 17ms + 90ms);
  }
}

@media (pointer: coarse) {
  .dekinai-atmosphere i {
    transform: none !important;
  }

  .dekinai-active .dekinai-question-mark i,
  .dekinai-active .dekinai-method-orbit i {
    animation: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .dekinai-theory *,
  .dekinai-theory *::before,
  .dekinai-theory *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .dekinai-motion-ready .dekinai-reveal,
  .dekinai-split.dekinai-prepared .dekinai-char {
    opacity: 1 !important;
    transform: none !important;
  }
}