.page-about {
  --pa-line: 1px solid var(--c-grid);
  --pa-sec: clamp(48px, 7vw, 100px);
  padding-bottom: var(--pa-sec);
  font-family: var(--font-body);
  color: var(--c-white);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 2.4vw, 28px);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 38px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-hero .kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0;
}

.page-about .about-hero .lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(15.5px, 1.1vw, 17px);
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 66ch;
}

.page-about .about-hero__aside {
  padding-top: clamp(12px, 2vw, 18px);
  border-top: var(--pa-line);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 34ch;
}

.page-about .hero-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-grid);
  border: var(--pa-line);
}

.page-about .hero-figure {
  background: var(--c-night);
  padding: 14px 15px 16px;
}

.page-about .hero-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--c-green);
}

.page-about .hero-figure__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}

/* ---------- section shell ---------- */
.page-about .about-sec {
  margin-top: var(--pa-sec);
  scroll-margin-top: 100px;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: start;
  border-top: var(--pa-line);
  padding-top: clamp(14px, 2vw, 22px);
}

.page-about .about-sec__head .kicker {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0;
}

.page-about .about-sec h2 {
  grid-column: 1;
  grid-row: 2;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.8vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-anno {
  grid-column: 2;
  grid-row: 1 / span 2;
  writing-mode: vertical-rl;
  align-self: start;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-mist);
  opacity: 0.62;
  user-select: none;
}

.page-about .about-sec__body {
  margin-top: clamp(20px, 3vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 44px);
}

.page-about .sec-intro {
  margin: 0;
  font-size: clamp(15.5px, 1.05vw, 17px);
  line-height: 1.78;
  color: var(--c-white);
  max-width: 70ch;
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: clamp(15.5px, 1.05vw, 17px);
  line-height: 1.78;
  color: var(--c-white);
  max-width: 72ch;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- media ---------- */
.page-about .about-figure {
  margin: 0;
  border: var(--pa-line);
  background: var(--c-stand);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.page-about .media__caption {
  padding: 10px 13px 12px;
  border-top: var(--pa-line);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

/* ---------- season track ---------- */
.page-about .season-track {
  list-style: none;
  margin: clamp(22px, 3.4vw, 40px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: var(--c-grid);
}

.page-about .season-node {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

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

.page-about .season-node::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-night);
  border: 2px solid var(--c-green);
  z-index: 1;
}

.page-about .season-node--current::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.18);
}

.page-about .season-node__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-white);
}

.page-about .season-node__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-green);
  margin-bottom: 6px;
}

.page-about .season-node--current .season-node__tag {
  color: var(--c-orange);
}

.page-about .season-node h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 1.9vw, 23px);
  line-height: 1.28;
}

.page-about .season-node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mist);
  max-width: 64ch;
}

/* ---------- flow bar ---------- */
.page-about .flow-bar {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-grid);
  border: var(--pa-line);
}

.page-about .flow-step {
  position: relative;
  background: var(--c-stand);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .flow-step__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-orange);
}

.page-about .flow-step h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.2;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- compare ---------- */
.page-about .field-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(6px, 1vw, 14px);
}

.page-about .field-compare__col {
  border: var(--pa-line);
  border-left: 3px solid var(--c-grid);
  background: var(--c-stand);
  padding: clamp(16px, 2vw, 24px);
}

.page-about .field-compare__col--now {
  border-left-color: var(--c-green);
}

.page-about .field-compare__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .field-compare__col--now .field-compare__label {
  color: var(--c-green-hi);
}

.page-about .field-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .field-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-white);
}

.page-about .field-list li:last-child {
  margin-bottom: 0;
}

.page-about .field-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--c-grid);
}

.page-about .field-compare__col--now .field-list li::before {
  background: var(--c-green);
}

/* ---------- track list ---------- */
.page-about .track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-grid);
  border: var(--pa-line);
}

.page-about .track-item {
  background: var(--c-night);
  padding: clamp(14px, 1.8vw, 20px);
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
}

.page-about .track-item__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 26px);
  letter-spacing: -0.02em;
  color: var(--c-green);
}

.page-about .track-item__label {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- contact ---------- */
.page-about .about-contact {
  border: var(--pa-line);
  border-top: 3px solid var(--c-orange);
  background: var(--c-stand);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .contact-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.page-about .contact-list__label {
  flex: 0 0 100%;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .contact-list__value {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .contact-list__item:last-child .contact-list__value {
  font-family: var(--font-body);
}

.page-about .copy-btn {
  font-family: var(--font-body);
  font-size: 12.5px;
  padding: 5px 12px;
  color: var(--c-green-hi);
  background: transparent;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .copy-btn:hover {
  border-color: var(--c-green);
  color: var(--c-white);
}

.page-about .copy-btn.is-done {
  border-color: var(--c-green);
  background: rgba(47, 191, 113, 0.14);
  color: var(--c-green-hi);
}

.page-about .copy-status {
  font-size: 12px;
  color: var(--c-green-hi);
}

.page-about .contact-list__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: var(--pa-line);
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .about-figure--wide {
  margin-top: clamp(20px, 3vw, 34px);
}

/* ---------- next links ---------- */
.page-about .about-next {
  margin-top: var(--pa-sec);
  border-top: var(--pa-line);
  padding-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 28px);
  margin: 0 0 18px;
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-grid);
  border: var(--pa-line);
}

.page-about .next-links li {
  background: var(--c-night);
}

.page-about .next-link {
  display: block;
  padding: 15px 16px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-left-color: var(--c-green);
  background: var(--c-stand);
  color: var(--c-green-hi);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--c-green-hi);
  outline-offset: 2px;
}

/* ---------- responsive ---------- */
@media (min-width: 700px) {
  .page-about .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .about-hero__aside {
    border-top: none;
    border-left: var(--pa-line);
    padding-top: 0;
    padding-left: clamp(16px, 2.2vw, 28px);
  }

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

  .page-about .about-sec__body--split.media-left {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

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

  .page-about .flow-step + .flow-step::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 50%;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--c-orange);
    transform: translateY(-50%);
    z-index: 2;
  }

  .page-about .season-node {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 0 26px;
    padding-left: 34px;
  }

  .page-about .season-track::before {
    left: 8px;
  }

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

  .page-about .contact-list__item:nth-child(3) {
    grid-column: 1 / -1;
  }

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

@media (min-width: 1100px) {
  .page-about .track-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .copy-btn,
  .page-about .next-link {
    transition: none;
  }
}
<<<END>>>