.mottainai-theory {
  --mt-red: #e21e2f;
  --mt-ink: #060606;
  --mt-paper: #f0ece3;
  --mt-muted: rgba(240, 236, 227, 0.6);
  --mt-line: rgba(240, 236, 227, 0.16);
  --mt-pointer-x: 0px;
  --mt-pointer-y: 0px;
  --mt-progress: 0;
  position: relative;
  z-index: 1;
  isolation: isolate;
  overflow: clip;
  background:
    radial-gradient(circle at 79% 11%, rgba(226, 30, 47, 0.14), transparent 24%),
    radial-gradient(circle at 12% 65%, rgba(104, 0, 10, 0.18), transparent 28%),
    linear-gradient(170deg, #0a0909 0%, #050505 50%, #0b0808 100%);
  color: var(--mt-paper);
  font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  overflow-wrap: break-word;
  word-break: normal;
  line-break: strict;
}

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

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

.mottainai-atmosphere::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-image:
    linear-gradient(135deg, transparent 48.9%, rgba(255, 255, 255, 0.055) 49.5%, transparent 50.1%),
    linear-gradient(45deg, transparent 48.9%, rgba(226, 30, 47, 0.04) 49.5%, transparent 50.1%);
  background-size: 112px 112px;
  mask-image: linear-gradient(to bottom, #000, transparent 94%);
}

.mottainai-atmosphere::after {
  content: "OWN WAY";
  position: absolute;
  top: 8%;
  left: -3vw;
  color: transparent;
  font: 900 clamp(7rem, 22vw, 21rem)/0.72 Arial, sans-serif;
  letter-spacing: -0.09em;
  white-space: nowrap;
  -webkit-text-stroke: 1px rgba(240, 236, 227, 0.035);
  transform: rotate(-7deg);
}

.mottainai-atmosphere i {
  position: absolute;
  display: block;
  width: 30vw;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(226, 30, 47, 0.18), transparent);
  transform: translate3d(var(--mt-pointer-x), var(--mt-pointer-y), 0) rotate(var(--mt-line-angle, 0deg));
  transition: transform 850ms cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-atmosphere i:nth-child(1) { top: 15%; left: -5vw; --mt-line-angle: 24deg; }
.mottainai-atmosphere i:nth-child(2) {
  top: 53%;
  right: -5vw;
  --mt-line-angle: -32deg;
  transform: translate3d(calc(0px - var(--mt-pointer-x)), var(--mt-pointer-y), 0) rotate(var(--mt-line-angle));
}
.mottainai-atmosphere i:nth-child(3) {
  bottom: 9%;
  left: 26%;
  --mt-line-angle: 12deg;
  transform: translate3d(var(--mt-pointer-x), calc(0px - var(--mt-pointer-y)), 0) rotate(var(--mt-line-angle));
}

.mottainai-progress {
  position: absolute;
  top: 3rem;
  right: clamp(1rem, 2.6vw, 3rem);
  bottom: 3rem;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: rgba(240, 236, 227, 0.28);
  font: 700 0.52rem/1 Arial, sans-serif;
  letter-spacing: 0.15em;
  writing-mode: vertical-rl;
  pointer-events: none;
}

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

.mottainai-progress b::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(var(--mt-red), rgba(226, 30, 47, 0.04));
  transform: scaleY(var(--mt-progress));
  transform-origin: top;
}

.mottainai-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(--mt-line);
}

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

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

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

.mottainai-opening {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(330px, 0.75fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
  min-height: max(100svh, 760px);
}

.mottainai-overline,
.mottainai-chapter-head {
  font-family: Arial, Helvetica, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.24em;
}

.mottainai-overline {
  margin: 0 0 2.5rem;
  color: var(--mt-red);
  font-size: clamp(0.64rem, 0.78vw, 0.78rem);
  font-weight: 800;
}

.mottainai-opening h2 {
  max-width: 10em;
  margin: 0;
  font-size: clamp(3.7rem, 8.2vw, 8.4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.075em;
  text-wrap: balance;
}

.mottainai-lead {
  max-width: 33rem;
  margin: clamp(2.5rem, 5vw, 4.2rem) 0 0;
  color: var(--mt-muted);
  font-size: clamp(1rem, 1.45vw, 1.3rem);
  line-height: 2;
}

.mottainai-lead strong {
  display: block;
  color: var(--mt-red);
  font-size: 1.25em;
}

.mottainai-mountain {
  position: relative;
  width: min(35vw, 440px);
  aspect-ratio: 1;
  margin-inline: auto;
  opacity: 0.18;
  transform: translateY(40px) scale(0.82);
  transition:
    opacity 1s ease,
    transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-seen .mottainai-mountain {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.mottainai-mountain::before,
.mottainai-mountain::after {
  content: "";
  position: absolute;
  bottom: 10%;
  width: 72%;
  height: 63%;
  border: 1px solid rgba(240, 236, 227, 0.28);
  transform: rotate(45deg);
}

.mottainai-mountain::before { left: -3%; }
.mottainai-mountain::after { right: -8%; width: 54%; height: 48%; border-color: rgba(226, 30, 47, 0.38); }

.mottainai-mountain > span {
  position: absolute;
  z-index: 2;
  width: 12px;
  aspect-ratio: 1;
  border: 1px solid var(--mt-red);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0);
  transition:
    opacity 0.6s ease,
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-mountain > span:nth-child(1) { top: 22%; right: 30%; }
.mottainai-mountain > span:nth-child(2) { top: 39%; right: 12%; transition-delay: 100ms; }
.mottainai-mountain > span:nth-child(3) { top: 48%; left: 31%; transition-delay: 200ms; }
.mottainai-mountain > span:nth-child(4) { top: 28%; left: 13%; transition-delay: 300ms; }
.mottainai-mountain > span:nth-child(5) { bottom: 18%; right: 35%; transition-delay: 400ms; }

.mottainai-seen .mottainai-mountain > span {
  opacity: 1;
  transform: scale(1);
}

.mottainai-mountain > i {
  position: absolute;
  bottom: 4%;
  left: 46%;
  z-index: 3;
  width: 22%;
  height: 82%;
  border-left: 2px solid var(--mt-red);
  border-radius: 50%;
  transform: rotate(12deg) scaleY(0);
  transform-origin: bottom;
  transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1) 250ms;
}

.mottainai-seen .mottainai-mountain > i {
  transform: rotate(12deg) scaleY(1);
}

.mottainai-mountain > b {
  position: absolute;
  top: 9%;
  left: 55%;
  z-index: 4;
  width: 9px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--mt-red);
  box-shadow: 0 0 25px rgba(226, 30, 47, 0.85);
}

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

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

.mottainai-chapter-head small {
  color: var(--mt-muted);
  font: 500 0.78rem/1 "Noto Serif JP", serif;
  letter-spacing: 0.22em;
}

.mottainai-copy,
.mottainai-train-copy,
.mottainai-safe-inner,
.mottainai-definition-inner,
.mottainai-applause-inner {
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  line-height: 2.1;
}

.mottainai-copy p,
.mottainai-train-copy p,
.mottainai-safe-inner p,
.mottainai-definition-inner p,
.mottainai-applause-inner p {
  margin: 0 0 1.2em;
}

.mottainai-copy strong,
.mottainai-train-copy strong,
.mottainai-safe-inner strong,
.mottainai-definition-inner strong,
.mottainai-applause-inner strong {
  color: var(--mt-red);
  font-weight: 800;
}

.mottainai-black-box {
  position: relative;
  margin: clamp(2.5rem, 5vw, 4.5rem) 0;
  padding: clamp(1.8rem, 4.5vw, 3.8rem);
  border-left: 3px solid var(--mt-red);
  background:
    linear-gradient(115deg, rgba(226, 30, 47, 0.12), transparent 62%),
    #020202;
  color: var(--mt-paper);
  font-size: clamp(1.2rem, 2.35vw, 2.2rem);
  line-height: 1.6;
}

.mottainai-black-box p {
  margin: 0 0 0.35rem;
  color: var(--mt-muted);
  font-size: 0.68em;
}

.mottainai-ordinary-grid,
.mottainai-got-off-grid,
.mottainai-why-grid,
.mottainai-flow-grid,
.mottainai-faces-grid,
.mottainai-challenge-grid,
.mottainai-proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.72fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
}

.mottainai-reverse {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  width: min(30vw, 380px);
  min-height: 320px;
  margin-inline: auto;
}

.mottainai-reverse > span {
  display: block;
  width: 100%;
  height: 1px;
  background: rgba(240, 236, 227, 0.25);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-reverse > span:nth-child(2) { transition-delay: 120ms; }
.mottainai-reverse > span:nth-child(3) { transition-delay: 240ms; }
.mottainai-seen .mottainai-reverse > span { transform: scaleX(1); }

.mottainai-reverse > i {
  position: absolute;
  top: 50%;
  right: 5%;
  width: 72%;
  height: 2px;
  background: var(--mt-red);
  transform: rotate(180deg) scaleX(0);
  transform-origin: right;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1) 420ms;
}

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

.mottainai-seen .mottainai-reverse > i { transform: rotate(180deg) scaleX(1); }

.mottainai-reverse > b {
  position: absolute;
  right: 0;
  bottom: 2rem;
  color: rgba(240, 236, 227, 0.12);
  font: 900 3.4rem/1 Arial, sans-serif;
  letter-spacing: -0.06em;
}

.mottainai-ticket-stack {
  position: relative;
  width: min(30vw, 380px);
  min-height: 330px;
  margin-inline: auto;
}

.mottainai-ticket-stack > span {
  position: absolute;
  top: calc(var(--ticket-index) * 26%);
  left: calc(var(--ticket-index) * 8%);
  display: grid;
  place-items: center;
  width: 76%;
  height: 31%;
  border: 1px solid rgba(240, 236, 227, 0.25);
  background: #090909;
  color: rgba(240, 236, 227, 0.35);
  font: 800 1rem/1 Arial, sans-serif;
  letter-spacing: 0.25em;
  opacity: 0;
  transform: translateX(40px) rotate(5deg);
  transition:
    opacity 0.7s ease,
    transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-ticket-stack > span:nth-child(1) { --ticket-index: 0; }
.mottainai-ticket-stack > span:nth-child(2) { --ticket-index: 1; transition-delay: 130ms; }
.mottainai-ticket-stack > span:nth-child(3) { --ticket-index: 2; transition-delay: 260ms; }

.mottainai-seen .mottainai-ticket-stack > span {
  opacity: 1;
  transform: translateX(0) rotate(-3deg);
}

.mottainai-ticket-stack > i {
  position: absolute;
  top: 5%;
  right: 18%;
  width: 2px;
  height: 93%;
  background: var(--mt-red);
  transform: rotate(27deg) scaleY(0);
  transform-origin: top;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1) 480ms;
}

.mottainai-seen .mottainai-ticket-stack > i {
  transform: rotate(27deg) scaleY(1);
}

.mottainai-doubt {
  max-width: 900px;
  margin: clamp(6rem, 11vw, 11rem) auto 0;
  text-align: center;
}

.mottainai-doubt h3 {
  margin: 0 0 2rem;
  color: var(--mt-red);
  font-size: clamp(3rem, 7vw, 7rem);
  line-height: 1;
}

.mottainai-doubt blockquote,
.mottainai-faces blockquote {
  margin: 2.5rem 0 0;
  padding: clamp(1.5rem, 3.5vw, 2.8rem);
  background: #020202;
  color: var(--mt-paper);
  font-size: clamp(1.08rem, 1.9vw, 1.65rem);
  line-height: 2;
}

.mottainai-train-scene {
  overflow: hidden;
}

.mottainai-train-copy {
  position: relative;
  z-index: 2;
  max-width: 850px;
}

.mottainai-train-copy > h3 {
  margin: 1.5rem 0 3rem;
  color: var(--mt-red);
  font-size: clamp(2.4rem, 5.8vw, 6rem);
  line-height: 1.25;
}

.mottainai-train {
  position: absolute;
  right: -4vw;
  bottom: 4vw;
  width: min(53vw, 720px);
  height: 250px;
  opacity: 0.26;
  pointer-events: none;
}

.mottainai-train > span {
  position: absolute;
  right: 0;
  bottom: var(--rail-bottom, 28%);
  width: 100%;
  height: 1px;
  background: rgba(240, 236, 227, 0.55);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 1.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-train > span:nth-child(2) { --rail-bottom: 17%; transition-delay: 120ms; }
.mottainai-seen .mottainai-train > span { transform: scaleX(1); }

.mottainai-train > i {
  position: absolute;
  right: 9%;
  bottom: 28%;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mt-red);
  box-shadow: 0 0 18px rgba(226, 30, 47, 0.8);
  transform: translateX(0);
  transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1) 340ms;
}

.mottainai-train > i:nth-of-type(2) { bottom: 17%; }
.mottainai-seen .mottainai-train > i { transform: translateX(-54vw); }

.mottainai-train > b {
  position: absolute;
  right: 20%;
  bottom: 25%;
  width: 32px;
  height: 62px;
  border: 1px solid var(--mt-red);
  opacity: 0;
  transform: translateY(0);
  transition:
    opacity 0.5s ease 680ms,
    transform 1s cubic-bezier(0.16, 1, 0.3, 1) 680ms;
}

.mottainai-seen .mottainai-train > b {
  opacity: 1;
  transform: translate(-65px, -45px);
}

.mottainai-two-roads {
  position: relative;
  width: min(31vw, 410px);
  aspect-ratio: 1;
  margin-inline: auto;
}

.mottainai-two-roads > span {
  position: absolute;
  top: 52%;
  left: 4%;
  width: 92%;
  height: 2px;
  background: rgba(240, 236, 227, 0.32);
  transform: rotate(var(--road-angle, 0deg)) scaleX(0);
  transform-origin: left;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-two-roads > span:first-child { --road-angle: -22deg; }
.mottainai-two-roads > span:nth-child(2) { --road-angle: 24deg; background: var(--mt-red); transition-delay: 150ms; }
.mottainai-seen .mottainai-two-roads > span { transform: rotate(var(--road-angle)) scaleX(1); }

.mottainai-two-roads > i,
.mottainai-two-roads > b {
  position: absolute;
  right: 0;
  color: rgba(240, 236, 227, 0.4);
  font: 800 0.66rem/1 Arial, sans-serif;
  letter-spacing: 0.2em;
}

.mottainai-two-roads > i { top: 20%; }
.mottainai-two-roads > b { bottom: 20%; color: var(--mt-red); }

.mottainai-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  width: min(31vw, 400px);
  margin-inline: auto;
  padding: 2rem;
}

.mottainai-flow > span {
  position: relative;
  width: 44px;
  height: 2px;
  background: rgba(240, 236, 227, 0.48);
  opacity: 0;
  transform: translateX(-25px);
  transition:
    opacity 0.6s ease,
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-flow > span::after,
.mottainai-flow > b::after {
  content: "";
  position: absolute;
  top: -4px;
  right: 0;
  width: 8px;
  height: 8px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
}

.mottainai-flow > span:nth-child(2) { transition-delay: 80ms; }
.mottainai-flow > span:nth-child(3) { transition-delay: 160ms; }
.mottainai-flow > span:nth-child(4) { transition-delay: 240ms; }
.mottainai-flow > span:nth-child(5) { transition-delay: 320ms; }
.mottainai-flow > span:nth-child(6) { transition-delay: 400ms; }
.mottainai-seen .mottainai-flow > span { opacity: 1; transform: translateX(0); }

.mottainai-flow > b {
  position: absolute;
  bottom: 1rem;
  left: 42%;
  width: 55%;
  height: 2px;
  color: var(--mt-red);
  background: var(--mt-red);
  transform: rotate(180deg) scaleX(0);
  transform-origin: right;
  transition: transform 1.1s cubic-bezier(0.16, 1, 0.3, 1) 520ms;
}

.mottainai-seen .mottainai-flow > b { transform: rotate(180deg) scaleX(1); }

.mottainai-flow > i {
  position: absolute;
  bottom: calc(1rem - 4px);
  left: 37%;
  width: 10px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--mt-red);
  box-shadow: 0 0 20px rgba(226, 30, 47, 0.8);
}

.mottainai-flow-grid .mottainai-copy h3 {
  margin: 2.8rem 0 0;
  color: var(--mt-red);
  font-size: clamp(2rem, 4.5vw, 4.6rem);
  line-height: 1.4;
}

.mottainai-clouded-faces {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  width: min(30vw, 370px);
  margin-inline: auto;
}

.mottainai-clouded-faces > span {
  position: relative;
  display: block;
  aspect-ratio: 1;
  border: 1px solid rgba(240, 236, 227, 0.28);
  border-radius: 50%;
  opacity: 0.65;
  transition:
    opacity 1s ease,
    background 1s ease;
}

.mottainai-clouded-faces > span::before,
.mottainai-clouded-faces > span::after {
  content: "";
  position: absolute;
  top: 42%;
  width: 5px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(240, 236, 227, 0.6);
}

.mottainai-clouded-faces > span::before { left: 30%; }
.mottainai-clouded-faces > span::after { right: 30%; }

.mottainai-seen .mottainai-clouded-faces > span {
  opacity: 0.28;
  background: rgba(240, 236, 227, 0.05);
}

.mottainai-clouded-faces > i {
  position: absolute;
  inset: -10%;
  background: radial-gradient(circle, rgba(226, 30, 47, 0.13), transparent 67%);
  opacity: 0;
  transition: opacity 1s ease 380ms;
}

.mottainai-seen .mottainai-clouded-faces > i { opacity: 1; }

.mottainai-return-reason {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(240, 236, 227, 0.18);
}

.mottainai-return-reason small,
.mottainai-real-challenge small {
  display: block;
  margin-bottom: 1.5rem;
  color: var(--mt-red);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
}

.mottainai-return-reason strong {
  display: block;
  margin-top: 2rem;
  color: var(--mt-red);
  font-size: clamp(1.65rem, 3.2vw, 3.2rem);
  line-height: 1.55;
}

.mottainai-safe-choice {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.mottainai-safe-inner {
  position: relative;
  z-index: 2;
  width: min(100%, 850px);
  margin: auto;
}

.mottainai-safe-box {
  position: absolute;
  right: 4vw;
  bottom: -6vw;
  width: min(37vw, 500px);
  aspect-ratio: 1;
  opacity: 0.22;
  transform: rotate(45deg) scale(0.72);
  transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-seen .mottainai-safe-box { transform: rotate(45deg) scale(1); }

.mottainai-safe-box > span {
  position: absolute;
  inset: var(--safe-inset, 0);
  border: 1px solid rgba(240, 236, 227, 0.35);
}

.mottainai-safe-box > span:nth-child(2) { --safe-inset: 17%; border-color: rgba(226, 30, 47, 0.38); }
.mottainai-safe-box > span:nth-child(3) { --safe-inset: 34%; }

.mottainai-safe-box > i {
  position: absolute;
  inset: 42%;
  display: grid;
  place-items: center;
  color: var(--mt-red);
  font: 800 0.7rem/1 Arial, sans-serif;
  letter-spacing: 0.12em;
  transform: rotate(-45deg);
}

.mottainai-real-challenge {
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: clamp(1.8rem, 4vw, 3.5rem);
  border: 1px solid rgba(226, 30, 47, 0.55);
  background: linear-gradient(120deg, rgba(226, 30, 47, 0.08), transparent);
}

.mottainai-real-challenge strong {
  display: block;
  margin: 1.5rem 0;
  font-size: clamp(1.6rem, 3vw, 3rem);
  line-height: 1.5;
}

.mottainai-unknown-map {
  position: relative;
  width: min(30vw, 390px);
  aspect-ratio: 1;
  margin-inline: auto;
  border: 1px solid rgba(240, 236, 227, 0.15);
  background:
    linear-gradient(rgba(240, 236, 227, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 236, 227, 0.06) 1px, transparent 1px);
  background-size: 33% 33%;
}

.mottainai-unknown-map > span {
  position: absolute;
  top: 48%;
  left: 8%;
  width: 12px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--mt-red);
  box-shadow: 0 0 22px rgba(226, 30, 47, 0.75);
}

.mottainai-unknown-map > i {
  position: absolute;
  top: 51%;
  left: 11%;
  width: var(--map-width, 35%);
  height: 1px;
  background: rgba(240, 236, 227, 0.52);
  transform: rotate(var(--map-angle, 0deg)) scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-unknown-map > i:nth-of-type(1) { --map-angle: -28deg; --map-width: 56%; }
.mottainai-unknown-map > i:nth-of-type(2) { --map-angle: 13deg; --map-width: 72%; transition-delay: 130ms; }
.mottainai-unknown-map > i:nth-of-type(3) { --map-angle: 43deg; --map-width: 48%; transition-delay: 260ms; }
.mottainai-seen .mottainai-unknown-map > i { transform: rotate(var(--map-angle)) scaleX(1); }

.mottainai-unknown-map > b {
  position: absolute;
  right: 10%;
  bottom: 29%;
  width: 25px;
  height: 40px;
  border-left: 2px solid var(--mt-red);
  border-top: 2px solid var(--mt-red);
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease 650ms,
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1) 650ms;
}

.mottainai-seen .mottainai-unknown-map > b { opacity: 1; transform: translateY(0); }

.mottainai-voices {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.mottainai-voices-inner {
  position: relative;
  z-index: 2;
  width: min(100%, 900px);
  margin: auto;
}

.mottainai-voices-inner > blockquote {
  display: grid;
  gap: 1rem;
  margin: 0 0 4rem;
  padding: 0;
  border: 0;
  color: var(--mt-muted);
  font-size: clamp(1.35rem, 2.8vw, 2.6rem);
  line-height: 1.5;
}

.mottainai-voices-inner > blockquote span:nth-child(2) { margin-left: 12%; }
.mottainai-voices-inner > blockquote span:nth-child(3) { margin-left: 24%; }

.mottainai-sound-lines {
  position: absolute;
  right: -8vw;
  bottom: 6%;
  width: min(47vw, 640px);
  aspect-ratio: 1;
  opacity: 0.2;
}

.mottainai-sound-lines span {
  position: absolute;
  inset: var(--sound-inset, 0);
  border: 1px solid rgba(240, 236, 227, 0.35);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.6);
  transition:
    opacity 0.7s ease,
    transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-sound-lines span:nth-child(1) { --sound-inset: 0; }
.mottainai-sound-lines span:nth-child(2) { --sound-inset: 14%; transition-delay: 100ms; }
.mottainai-sound-lines span:nth-child(3) { --sound-inset: 28%; transition-delay: 200ms; }
.mottainai-sound-lines span:nth-child(4) { --sound-inset: 42%; transition-delay: 300ms; border-color: var(--mt-red); }
.mottainai-seen .mottainai-sound-lines span { opacity: 1; transform: scale(1); }

.mottainai-proof-steps {
  display: grid;
  gap: 0;
  margin: 3rem 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(240, 236, 227, 0.18);
}

.mottainai-proof-steps li {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(240, 236, 227, 0.18);
}

.mottainai-proof-steps span {
  color: var(--mt-red);
  font: 800 0.65rem/1 Arial, sans-serif;
  letter-spacing: 0.15em;
}

.mottainai-proof-machine {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
  width: min(28vw, 350px);
  margin-inline: auto;
}

.mottainai-proof-machine span,
.mottainai-proof-machine b {
  display: grid;
  place-items: center;
  height: 3.7rem;
  border: 1px solid rgba(240, 236, 227, 0.2);
  color: var(--mt-muted);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  opacity: 0;
  transform: translateX(-25px);
  transition:
    opacity 0.6s ease,
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-proof-machine i {
  width: 32px;
  height: 1px;
  background: var(--mt-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.8s ease;
}

.mottainai-proof-machine span:nth-of-type(2),
.mottainai-proof-machine i:nth-of-type(2) { transition-delay: 140ms; }
.mottainai-proof-machine span:nth-of-type(3),
.mottainai-proof-machine i:nth-of-type(3) { transition-delay: 280ms; }
.mottainai-proof-machine b { border-color: var(--mt-red); color: var(--mt-red); transition-delay: 420ms; }
.mottainai-seen .mottainai-proof-machine span,
.mottainai-seen .mottainai-proof-machine b { opacity: 1; transform: translateX(0); }
.mottainai-seen .mottainai-proof-machine i { transform: scaleX(1); }

.mottainai-definition {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.mottainai-definition-inner {
  position: relative;
  z-index: 2;
  width: min(100%, 850px);
  margin: auto;
}

.mottainai-blueprint {
  position: absolute;
  right: -4vw;
  bottom: -5vw;
  width: min(38vw, 500px);
  aspect-ratio: 1;
  opacity: 0.22;
}

.mottainai-blueprint span {
  position: absolute;
  border: 1px solid rgba(240, 236, 227, 0.35);
  opacity: 0;
  transform: translate(20px, 20px);
  transition:
    opacity 0.7s ease,
    transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-blueprint span:nth-child(1) { inset: 8% 34% 44% 8%; }
.mottainai-blueprint span:nth-child(2) { inset: 34% 8% 10% 34%; transition-delay: 150ms; }
.mottainai-blueprint span:nth-child(3) { inset: 23%; border-color: rgba(226, 30, 47, 0.5); transition-delay: 300ms; }
.mottainai-seen .mottainai-blueprint span { opacity: 1; transform: translate(0, 0); }

.mottainai-blueprint i {
  position: absolute;
  top: 50%;
  left: 3%;
  width: 94%;
  height: 1px;
  background: var(--mt-red);
  transform: rotate(-42deg) scaleX(0);
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1) 460ms;
}

.mottainai-seen .mottainai-blueprint i { transform: rotate(-42deg) scaleX(1); }

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

.mottainai-applause-inner {
  position: relative;
  z-index: 2;
  width: min(100%, 950px);
  margin: auto;
  text-align: center;
}

.mottainai-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);
}

.mottainai-final-frame::after {
  content: "";
  position: absolute;
  inset: 0.45rem;
  border: 1px solid rgba(226, 30, 47, 0.17);
}

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

.mottainai-final-frame strong {
  display: block;
  font-size: clamp(1.8rem, 4vw, 4.1rem);
  line-height: 1.5;
}

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

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

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

.mottainai-footsteps {
  position: absolute;
  right: 0;
  bottom: 5%;
  left: 0;
  height: 80px;
  opacity: 0.35;
  pointer-events: none;
}

.mottainai-footsteps span {
  position: absolute;
  top: 50%;
  left: calc(8% + var(--step-index) * 13%);
  width: 8px;
  aspect-ratio: 0.65;
  border-radius: 50%;
  background: rgba(240, 236, 227, 0.65);
  opacity: 0;
  transform: translateY(20px) rotate(22deg);
  transition:
    opacity 0.5s ease,
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.mottainai-footsteps span:nth-child(1) { --step-index: 0; }
.mottainai-footsteps span:nth-child(2) { --step-index: 1; transition-delay: 120ms; }
.mottainai-footsteps span:nth-child(3) { --step-index: 2; transition-delay: 240ms; }
.mottainai-footsteps span:nth-child(4) { --step-index: 3; transition-delay: 360ms; }
.mottainai-footsteps span:nth-child(5) { --step-index: 4; transition-delay: 480ms; }
.mottainai-seen .mottainai-footsteps span { opacity: 1; transform: translateY(0) rotate(22deg); }

.mottainai-footsteps i {
  position: absolute;
  top: 50%;
  left: 68%;
  width: 25%;
  height: 1px;
  background: var(--mt-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.1s cubic-bezier(0.16, 1, 0.3, 1) 620ms;
}

.mottainai-seen .mottainai-footsteps i { transform: scaleX(1); }

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

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

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

.mottainai-split.mottainai-prepared .mottainai-char {
  display: inline-block;
  opacity: 0;
  transform: translate3d(0.2em, 1.08em, 0) rotate(6deg);
  transform-origin: left bottom;
  transition:
    opacity 0.56s ease,
    transform 0.84s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--mt-char-index) * 22ms + 110ms);
  will-change: transform, opacity;
}

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

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

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

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

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

  .mottainai-opening h2 {
    font-size: clamp(3.5rem, 14vw, 6.2rem);
  }

  .mottainai-mountain {
    width: min(76vw, 390px);
  }

  .mottainai-ordinary-grid,
  .mottainai-got-off-grid,
  .mottainai-why-grid,
  .mottainai-flow-grid,
  .mottainai-faces-grid,
  .mottainai-challenge-grid,
  .mottainai-proof-grid {
    grid-template-columns: 1fr;
  }

  .mottainai-reverse,
  .mottainai-ticket-stack,
  .mottainai-two-roads,
  .mottainai-flow,
  .mottainai-clouded-faces,
  .mottainai-unknown-map,
  .mottainai-proof-machine {
    width: min(76vw, 370px);
    margin-top: 2.5rem;
  }

  .mottainai-train {
    width: 86vw;
    opacity: 0.17;
  }

  .mottainai-safe-box,
  .mottainai-sound-lines,
  .mottainai-blueprint {
    opacity: 0.13;
  }

  .mottainai-proof-machine {
    grid-template-columns: 1fr auto;
  }
}

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

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

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

  .mottainai-opening h2 {
    font-size: clamp(3rem, 14.3vw, 4.5rem);
    line-height: 1.14;
  }

  .mottainai-copy,
  .mottainai-train-copy,
  .mottainai-safe-inner,
  .mottainai-definition-inner,
  .mottainai-applause-inner {
    font-size: 1rem;
    line-height: 2;
  }

  .mottainai-black-box {
    padding: 1.6rem 1.15rem;
    font-size: clamp(1.12rem, 5.8vw, 1.65rem);
  }

  .mottainai-doubt h3 {
    font-size: clamp(2.8rem, 14vw, 4rem);
  }

  .mottainai-doubt {
    text-align: left;
  }

  .mottainai-doubt blockquote,
  .mottainai-faces blockquote {
    padding: 1.4rem 1.1rem;
    font-size: 1.05rem;
  }

  .mottainai-train-copy > h3 {
    font-size: clamp(2rem, 9.6vw, 3rem);
  }

  .mottainai-flow-grid .mottainai-copy h3 {
    font-size: clamp(1.8rem, 8.8vw, 2.7rem);
  }

  .mottainai-return-reason strong {
    font-size: clamp(1.5rem, 7.4vw, 2.25rem);
  }

  .mottainai-real-challenge {
    padding: 1.55rem 1.1rem;
  }

  .mottainai-real-challenge strong {
    font-size: clamp(1.45rem, 7vw, 2.1rem);
  }

  .mottainai-voices-inner > blockquote span:nth-child(2),
  .mottainai-voices-inner > blockquote span:nth-child(3) {
    margin-left: 0;
  }

  .mottainai-proof-machine {
    width: 100%;
  }

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

  .mottainai-final-frame strong {
    font-size: clamp(1.5rem, 7.4vw, 2.25rem);
  }

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

  .mottainai-split.mottainai-prepared .mottainai-char {
    transform: translate3d(0.1em, 0.78em, 0) rotate(4deg);
    transition-delay: calc(var(--mt-char-index) * 17ms + 90ms);
  }
}

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

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

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