.page-about {
  --about-line: 3px solid var(--ink);
  --about-pad: clamp(44px, 7vw, 92px);
  background: var(--paper);
  color: var(--brown);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding: clamp(14px, 3vw, 30px) 0 clamp(40px, 7vw, 84px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 8vw, 66px);
  line-height: 1.03;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 14px 0 18px;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.78;
  max-width: 36em;
  margin: 0 0 24px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 3px;
  padding: 11px 14px;
  background: var(--paper-3);
  border-left: 6px solid var(--cyan);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__facts span {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--brown);
}

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

.page-about .about-hero__media {
  align-self: start;
}

.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-top: var(--about-line);
}

.page-about .about-chapter--tone {
  background: var(--paper-2);
}

.page-about .about-chapter--dark {
  background: var(--ink);
  color: var(--white);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-chapter__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 8vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--orange);
}

.page-about .about-chapter--dark .about-chapter__no {
  color: var(--lemon);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 10px 0 0;
  color: var(--ink);
}

.page-about .about-chapter--dark .about-chapter__title {
  color: var(--white);
}

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

.page-about .about-chapter__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  margin: 0 0 16px;
  max-width: 38em;
}

.page-about .about-chapter--dark .about-chapter__lede {
  color: var(--paper-2);
}

.page-about .about-chapter__body p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0 0 12px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: var(--about-line);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 8px;
  width: 13px;
  height: 13px;
  background: var(--orange);
  border: 3px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 10px;
  background: var(--ink);
  color: var(--lemon);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--ink);
  margin: 10px 0 8px;
}

.page-about .about-timeline__text {
  font-size: 15px;
  line-height: 1.78;
  max-width: 36em;
  margin: 0;
}

.page-about .about-takeaway {
  margin: 30px 0 0;
  padding: 14px 18px;
  border-left: 8px solid var(--cyan);
  background: rgba(43, 245, 200, 0.16);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-chapter--dark .about-takeaway {
  background: var(--cyan);
  border-left-color: var(--lemon);
  color: var(--ink);
}

.page-about .about-inline-link {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--chilli);
  text-decoration-thickness: 3px;
  text-underline-offset: 3px;
}

.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-flow__step {
  padding: 18px 16px;
  background: var(--ink-soft);
  border: 3px solid var(--moss);
  border-top-color: var(--cyan);
}

.page-about .about-flow__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lemon);
}

.page-about .about-flow__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--white);
  margin: 6px 0 8px;
}

.page-about .about-flow__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper-2);
  margin: 0;
}

.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-role {
  padding: 18px 18px 14px;
  background: var(--paper-3);
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-role__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.page-about .about-role__share {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  background: var(--ink);
  color: var(--cyan);
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
  margin: 10px 0 6px;
}

.page-about .about-role__desc {
  font-size: 14px;
  line-height: 1.72;
  margin: 0 0 12px;
}

.page-about .about-role__bar {
  height: 10px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
  margin-bottom: 12px;
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
}

.page-about .about-role__fill--a { width: 25%; background: var(--cyan); }
.page-about .about-role__fill--b { width: 32%; background: var(--orange); }
.page-about .about-role__fill--c { width: 29%; background: var(--chilli); }
.page-about .about-role__fill--d { width: 14%; background: var(--moss); }

.page-about .about-role__more summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 6px 0 6px 20px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
  border-top: 2px dashed var(--paper-2);
  padding-top: 10px;
}

.page-about .about-role__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-role__more summary::before {
  content: "＋";
  position: absolute;
  left: 0;
  top: 10px;
  font-family: var(--font-mono);
  color: var(--chilli);
}

.page-about .about-role__more[open] summary::before {
  content: "－";
}

.page-about .about-role__more ul {
  margin: 8px 0 0;
  padding: 0 0 0 20px;
  display: grid;
  gap: 6px;
}

.page-about .about-role__more li {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--brown);
}

.page-about .about-standard {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: 22px;
}

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

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

.page-about .about-standard__item {
  padding: 14px 16px;
  background: var(--paper-3);
  border-left: 6px solid var(--ink);
}

.page-about .about-standard__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 2px 8px;
  background: var(--orange);
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-standard__item p {
  font-size: 14.5px;
  line-height: 1.76;
  margin: 0;
}

.page-about .about-partner__grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-partner__card {
  padding: 20px 18px;
  background: var(--ink-soft);
  border: 3px solid var(--moss);
  border-left: 8px solid var(--orange);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 9vw, 76px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.05em;
  color: var(--lemon);
}

.page-about .about-partner__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--white);
  margin: 8px 0 8px;
}

.page-about .about-partner__text {
  font-size: 14px;
  line-height: 1.74;
  color: var(--paper-2);
  margin: 0;
}

.page-about .about-partner__media {
  margin-top: 20px;
}

.page-about .about-close {
  background: var(--ink);
  color: var(--white);
  border-top: 8px solid var(--cyan);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-close__inner {
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .about-close h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.4vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0;
}

.page-about .about-close p {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  max-width: 34em;
  color: var(--paper-2);
  margin: 0;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

@media (min-width: 640px) {
  .page-about .about-partner__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-roles > :nth-child(even) {
    margin-top: 24px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(170px, 226px) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 128px;
  }

  .page-about .about-standard {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role__more summary::before {
    transition: none;
  }
}