.page-about {
  --about-num: clamp(2.6rem, 9vw, 5.4rem);
  --about-cut: 14px;
  padding-bottom: clamp(48px, 9vw, 110px);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding-top: clamp(26px, 5vw, 54px);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .about-crumbs a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--gap);
  margin-top: clamp(24px, 4vw, 46px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 17em;
}

.page-about .about-hero__main .lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-index {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: clamp(14px, 2vw, 18px) 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .about-index a span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--dim);
  transition: color 0.25s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
}

.page-about .about-index a:hover span,
.page-about .about-index a:focus-visible span {
  color: var(--cyan);
}

.page-about .about-hero__card {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__ver {
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-2);
}

.page-about .about-hero__ver b {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-kv {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-kv li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-kv li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-kv__k {
  font-size: 13px;
  color: var(--text-2);
}

.page-about .about-kv__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-kv__v small {
  margin-left: 2px;
  font-size: 0.55em;
  font-weight: 400;
  color: var(--text-2);
}

.page-about .about-kv__v--sm {
  font-size: 15px;
  font-weight: 500;
  color: var(--orange);
}

.page-about .about-hero__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-2);
}

.page-about .about-sec {
  margin-top: clamp(52px, 9vw, 108px);
}

.page-about .section-title {
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .about-h-num {
  display: inline-block;
  margin-right: 12px;
  font-family: var(--font-mono);
  font-size: 0.46em;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--dim);
  vertical-align: middle;
  transform: translateY(-0.12em);
}

.page-about .layout {
  display: grid;
  gap: var(--gap);
  min-width: 0;
}

.page-about .layout__main {
  min-width: 0;
}

.page-about .about-intro {
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 40em;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-aside__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .about-aside__note {
  margin: 8px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .about-quick {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-quick li {
  padding: 11px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  background: rgba(0, 229, 212, 0.06);
  border-left: 2px solid var(--cyan);
}

.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 20px);
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px clamp(14px, 2.4vw, 28px);
  padding: clamp(20px, 3vw, 30px);
  transition: transform 0.35s var(--ease);
}

.page-about .about-rule__num {
  grid-row: 1 / span 3;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--about-num);
  font-weight: 700;
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: var(--dim);
  transition: color 0.35s var(--ease);
}

.page-about .about-rule__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2vw, 1.42rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-rule__body {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-2);
}

.page-about .about-rule__counter {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.72;
  color: var(--text-2);
  opacity: 0.6;
  transition: opacity 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-rule__counter b {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-rule:hover .about-rule__num,
.page-about .about-rule:focus-within .about-rule__num {
  color: var(--cyan);
}

.page-about .about-rule:hover .about-rule__counter,
.page-about .about-rule:focus-within .about-rule__counter {
  opacity: 1;
  border-left-color: var(--orange);
}

.page-about .about-figure {
  margin: 0 0 clamp(26px, 4vw, 46px);
}

.page-about .about-figure--compare {
  margin-top: clamp(22px, 3vw, 34px);
  margin-bottom: 0;
}

.page-about .media {
  max-width: 100%;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(28px, 5vw, 46px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--dim), var(--blue) 48%, var(--cyan));
  opacity: 0.5;
}

.page-about .about-stage {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-stage:last-child {
  padding-bottom: 0;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(28px, 5vw, 46px) + 3px);
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--dim);
  transform: rotate(45deg);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-stage:hover::before,
.page-about .about-stage:target::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(0, 229, 212, 0.14);
}

.page-about .about-stage__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-stage__title {
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.08rem, 2vw, 1.34rem);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-stage__body {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-2);
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-nodes a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-nodes a:hover,
.page-about .about-nodes a:focus-visible {
  color: var(--text);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 212, 0.06);
}

.page-about .about-nodes__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-about .about-nodes a:hover .about-nodes__k,
.page-about .about-nodes a:focus-visible .about-nodes__k {
  color: var(--cyan);
}

.page-about .about-compare {
  display: grid;
  gap: clamp(12px, 2vw, 20px);
}

.page-about .about-compare__col {
  padding: clamp(20px, 3vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  transition: opacity 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-compare__col--old {
  opacity: 0.7;
}

.page-about .about-compare__col--old:hover,
.page-about .about-compare__col--old:focus-within {
  opacity: 1;
}

.page-about .about-compare__col--new {
  border-color: rgba(0, 229, 212, 0.36);
}

.page-about .about-compare__col--new:hover,
.page-about .about-compare__col--new:focus-within {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-compare .tag {
  margin: 0 0 16px;
}

.page-about .about-tree {
  list-style: none;
  counter-reset: about-step;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-tree li {
  position: relative;
  padding: 10px 14px 10px 34px;
  border-left: 2px solid var(--blue);
  background: rgba(76, 111, 255, 0.08);
  font-size: 14px;
  color: var(--text);
}

.page-about .about-tree li::before {
  counter-increment: about-step;
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .about-compare__col--old .about-tree li:nth-child(2) {
  margin-left: 18px;
}

.page-about .about-compare__col--old .about-tree li:nth-child(3) {
  margin-left: 36px;
  border-left-color: var(--orange);
  background: rgba(255, 122, 61, 0.1);
}

.page-about .about-compare__col--new .about-tree li:last-child {
  border-left-color: var(--cyan);
  background: rgba(0, 229, 212, 0.1);
}

.page-about .about-compare__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--text-2);
}

.page-about .about-drops {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 20px);
}

.page-about .about-drop {
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-drop h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-drop dl {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-drop dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-drop dd {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
  gap: 10px;
}

.page-about .about-roles li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 14px;
  color: var(--text);
}

.page-about .about-roles b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-roles__note {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-2);
}

.page-about .about-cadence {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence li {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-cadence span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-april {
  padding: clamp(22px, 3.6vw, 38px);
}

.page-about .about-april__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 44em;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-april__list {
  margin: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-april__list dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-april__list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-next {
  margin-top: clamp(48px, 8vw, 96px);
  padding-top: clamp(24px, 3.6vw, 38px);
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-top {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

@media (max-width: 599px) {
  .page-about .about-rule {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-rule__num {
    grid-row: auto;
    font-size: clamp(2.4rem, 14vw, 3.4rem);
    line-height: 0.9;
  }

  .page-about .about-compare__col--old .about-tree li:nth-child(3) {
    margin-left: 18px;
  }
}

@media (min-width: 720px) {
  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-april__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }

  .page-about .layout__aside {
    position: sticky;
    top: clamp(24px, 4vw, 44px);
    align-self: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-drops {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rule,
  .page-about .about-rule__num,
  .page-about .about-rule__counter,
  .page-about .about-compare__col,
  .page-about .about-stage::before,
  .page-about .about-nodes a,
  .page-about .about-index a,
  .page-about .about-top {
    transition: none;
  }

  .page-about .about-compare__col--new:hover,
  .page-about .about-compare__col--new:focus-within {
    transform: none;
  }
}