.page-about {
  --about-hair: 1px solid var(--frost);
  --about-shadow: 0 1px 0 rgba(14, 19, 22, .05), 0 18px 36px -30px rgba(14, 19, 22, .85);
  background: var(--snow);
  color: var(--ink);
}

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

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--paper) 0%, var(--snow) 100%);
  border-bottom: var(--about-hair);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -20%;
  width: 66%;
  height: 132%;
  background: linear-gradient(158deg, var(--volt) 0 44%, var(--spring) 44% 72%, var(--autumn) 72% 100%);
  transform: rotate(-9deg);
  opacity: .1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(22px, 4vw, 44px) clamp(30px, 5vw, 60px);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: start;
  }
}

.page-about .about-hero__eyebrow {
  margin: 14px 0 10px;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  max-width: 20ch;
  font-size: clamp(32px, 6.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  border-top: var(--about-hair);
  display: grid;
  gap: 14px 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-facts__key {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ash);
}

.page-about .about-hero__media {
  margin: 0;
  padding: 10px;
  background: var(--paper);
  border: var(--print);
  box-shadow: var(--sheet-shadow);
}

@media (min-width: 960px) {
  .page-about .about-hero__media {
    transform: rotate(-1.4deg);
  }
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__media figcaption {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--frost);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--ash);
}

.page-about .about-hero__strip {
  position: relative;
  z-index: 1;
  height: 8px;
  background: linear-gradient(90deg, var(--spring) 0 25%, var(--volt) 25% 50%, var(--autumn) 50% 75%, var(--red) 75% 100%);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  background: var(--paper);
  border-bottom: var(--about-hair);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  display: grid;
  gap: 6px 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 820px) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 16px 0;
  }
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 2px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-toc__list a:hover {
  border-bottom-color: var(--autumn);
}

.page-about .about-toc__list span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--autumn);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(36px, 6vw, 76px);
}

.page-about .about-section--paper {
  background: var(--paper);
  border-block: var(--about-hair);
}

.page-about .chapter-band {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-cols {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-copy p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
}

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

.page-about .rail-note {
  margin: 0;
  padding: 16px 16px 16px 18px;
  background: var(--snow);
  border-left: 4px solid var(--autumn);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .rail-note strong {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ink);
}

/* ---------- 四季色卡 ---------- */
.page-about .about-wide-media {
  margin: clamp(20px, 3vw, 30px) 0 clamp(22px, 3vw, 32px);
  padding: 8px;
  background: var(--paper);
  border: var(--print);
  box-shadow: var(--sheet-shadow);
}

.page-about .about-wide-media img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-wide-media figcaption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--ash);
}

.page-about .seasons {
  display: grid;
  gap: 16px;
}

@media (min-width: 680px) {
  .page-about .seasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .seasons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .seasons > :nth-child(2) {
    margin-top: 26px;
  }

  .page-about .seasons > :nth-child(3) {
    margin-top: 10px;
  }

  .page-about .seasons > :nth-child(4) {
    margin-top: 36px;
  }
}

.page-about .season {
  position: relative;
  overflow: hidden;
  padding: 22px 52px 20px 18px;
  background: var(--paper);
  border: var(--about-hair);
  box-shadow: var(--about-shadow);
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .season:hover,
.page-about .season:focus-within {
  transform: translateY(-2px);
  border-color: var(--ink);
}

.page-about .season__bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
}

.page-about .season h3 {
  margin: 8px 0 10px;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -.01em;
}

.page-about .season p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash);
}

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

.page-about .season__note {
  position: absolute;
  top: 26px;
  right: 12px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--frost);
  transition: color .2s var(--ease);
}

.page-about .season:hover .season__note {
  color: var(--ink);
}

.page-about .season--spring .season__bar {
  background: var(--spring);
}

.page-about .season--summer .season__bar {
  background: var(--volt);
}

.page-about .season--autumn .season__bar {
  background: var(--autumn);
}

.page-about .season--winter .season__bar {
  background: var(--frost);
}

/* ---------- 复核流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .step {
  position: relative;
  padding: 16px 16px 16px 18px;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: var(--about-shadow);
}

.page-about .step__num {
  display: inline-block;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--paper);
  background: var(--ink);
}

.page-about .step h3 {
  margin: 10px 0 8px;
  font-size: 16px;
}

.page-about .step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash);
}

@media (min-width: 900px) {
  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -14px;
    top: 44px;
    width: 14px;
    height: 2px;
    background: var(--ink);
  }
}

.page-about .about-portrait {
  margin: 0;
  padding: 9px;
  background: var(--paper);
  border: var(--print);
  box-shadow: var(--sheet-shadow);
}

.page-about .about-portrait img {
  width: 100%;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-portrait figcaption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  margin-top: 20px;
}

@media (min-width: 920px) {
  .page-about .crew {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

.page-about .crew__stats {
  list-style: none;
  margin: 18px 0;
  padding: 0;
}

.page-about .crew__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--frost);
}

.page-about .crew__stat-num {
  min-width: 56px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
}

.page-about .crew__stat-key {
  font-size: 14px;
  color: var(--ash);
}

.page-about .about-fold {
  margin-bottom: 10px;
  padding: 0;
  background: var(--paper);
  border: var(--about-hair);
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--autumn);
}

.page-about .about-fold[open] summary::after {
  content: "–";
}

.page-about .about-fold[open] summary {
  border-bottom: 1px solid var(--frost);
}

.page-about .about-fold .panel__body {
  padding: 12px 16px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .about-numbers {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 1px;
  background: var(--frost);
  border: 1px solid var(--frost);
}

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

@media (min-width: 1000px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-number {
  padding: 18px 16px;
  background: var(--paper);
}

.page-about .about-number b {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: -.01em;
}

.page-about .about-number span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ash);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: linear-gradient(180deg, var(--spring) 0%, var(--volt) 38%, var(--autumn) 72%, var(--red) 100%);
  transform: skewY(-3deg);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 14px;
  height: 14px;
  background: var(--yellow);
  border: 2px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .timeline__item:nth-child(even)::before {
  background: var(--red);
}

.page-about .timeline__year {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
  background: var(--ink);
}

.page-about .timeline__item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ash);
}

/* ---------- 理由与行动 ---------- */
.page-about .reasons {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

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

.page-about .reason {
  padding: 20px 18px;
  background: var(--snow);
  border: var(--about-hair);
  border-top: 4px solid var(--volt);
}

.page-about .reason:nth-child(2) {
  border-top-color: var(--spring);
}

.page-about .reason:nth-child(3) {
  border-top-color: var(--autumn);
}

.page-about .reason:nth-child(4) {
  border-top-color: var(--ink);
}

.page-about .reason__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ash);
}

.page-about .reason h3 {
  margin: 8px 0 10px;
  font-size: 18px;
  line-height: 1.4;
}

.page-about .reason p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ash);
}

.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding: 22px 20px;
  display: grid;
  gap: 16px;
  background: var(--snow);
  border: 1px solid var(--frost);
  border-left: 6px solid var(--spring);
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season,
  .page-about .season__note,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .season:hover,
  .page-about .season:focus-within {
    transform: none;
  }
}
<<<END>>>