.page-about {
  --about-line: rgba(61, 110, 143, 0.26);
  --about-line-soft: rgba(61, 110, 143, 0.14);
  --about-shadow: rgba(14, 42, 71, 0.08);
  background: var(--mist);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about #trail,
.page-about #method,
.page-about #team,
.page-about #partners,
.page-about #rhythm {
  scroll-margin-top: 76px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 40px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--serif);
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.24;
  letter-spacing: 0.07em;
  font-weight: 600;
  color: var(--deep);
  margin: 12px 0 20px;
}

.page-about .about-hero__intro {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
  margin: 0 0 14px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .media__frame {
  border: 1px solid var(--about-line);
  background: var(--paper);
  padding: 8px;
}

.page-about .about-hero__media .media__frame {
  box-shadow: 12px 12px 0 var(--about-shadow);
}

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

.page-about .about-hero__media .media__img {
  aspect-ratio: 4 / 3;
}

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--tide);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(247, 244, 239, 0.95);
  border-top: 1px solid var(--about-line-soft);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-index__list {
  display: flex;
  gap: clamp(14px, 3vw, 30px);
  margin: 0;
  padding: 11px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--night);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--deep);
  border-bottom-color: var(--coral);
}

.page-about .about-index__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--tide);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head h2 {
  font-family: var(--serif);
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.32;
  letter-spacing: 0.06em;
  color: var(--deep);
  margin: 8px 0 14px;
  font-weight: 600;
}

.page-about .about-head__note {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 56ch;
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-trail {
  padding: clamp(38px, 6vw, 72px) 0 clamp(44px, 7vw, 88px);
}

.page-about .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .timeline__item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .timeline__detail > summary {
  list-style: none;
}

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

.page-about .timeline__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(12px, 3vw, 26px);
  align-items: baseline;
  padding: 20px 2px;
  cursor: pointer;
}

.page-about .timeline__year {
  font-family: var(--mono);
  font-size: clamp(15px, 2.4vw, 19px);
  letter-spacing: 0.06em;
  color: var(--tide);
}

.page-about .timeline__title {
  font-family: var(--serif);
  font-size: clamp(17px, 2.7vw, 22px);
  letter-spacing: 0.05em;
  color: var(--deep);
}

.page-about .timeline__summary::after {
  content: "＋";
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
  color: var(--tide);
}

.page-about .timeline__detail[open] .timeline__summary::after {
  content: "－";
  color: var(--coral);
}

.page-about .timeline__detail[open] .timeline__summary {
  padding-bottom: 12px;
}

.page-about .timeline__body {
  padding: 0 2px 24px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .timeline__media {
  border-bottom: 1px solid var(--about-line);
  padding: clamp(22px, 4vw, 36px) 0;
}

.page-about .timeline__media .media {
  margin: 0;
  max-width: 560px;
  margin-left: clamp(0px, 5vw, 88px);
}

.page-about .timeline__media .media__img {
  aspect-ratio: 4 / 3;
}

/* ---------- 整理方法 ---------- */
.page-about .about-method {
  background: var(--paper);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: clamp(38px, 6vw, 82px) 0;
}

.page-about .method-grid {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .method-note {
  border-left: 2px solid var(--gold);
  padding-left: 16px;
}

.page-about .method-note .label-mono {
  color: var(--tide);
  letter-spacing: 0.14em;
  font-size: 12px;
}

.page-about .method-note p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--night);
}

.page-about .method-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 42em;
}

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

.page-about .method-step {
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  padding: 18px 20px;
}

.page-about .method-step__num {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--tide);
  margin-bottom: 8px;
}

.page-about .method-step h3 {
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--deep);
  margin: 0 0 8px;
  font-weight: 600;
}

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

.page-about .method-quote {
  margin: 28px 0 0;
  padding: 22px 24px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--coral);
  box-shadow: 10px 10px 0 var(--about-shadow);
  font-family: var(--serif);
  font-size: clamp(16px, 2.6vw, 20px);
  line-height: 1.75;
  letter-spacing: 0.05em;
  color: var(--deep);
}

.page-about .method-media {
  margin: 30px 0 0;
}

.page-about .method-media .media__img {
  aspect-ratio: 3 / 2;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(40px, 7vw, 92px) 0;
}

.page-about .role-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 26px;
}

.page-about .role-tab {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  font-size: 14px;
  color: var(--deep);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .role-tab:hover,
.page-about .role-tab:focus-visible {
  border-color: var(--coral);
  transform: translateY(-2px);
}

.page-about .role-tab__count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--tide);
}

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

.page-about .role {
  position: relative;
  padding: 20px 22px 22px 24px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--coral);
  border-radius: 2px;
  scroll-margin-top: 90px;
}

.page-about .role h3 {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--deep);
  margin: 0 0 10px;
  font-weight: 600;
}

.page-about .role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  padding: clamp(34px, 5vw, 56px) 0 clamp(44px, 7vw, 92px);
}

.page-about .partner-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .partner-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .partner-item__num {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .partner-item__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
}

/* ---------- 更新节奏（深色收束） ---------- */
.page-about .about-rhythm {
  position: relative;
  background: var(--deep);
  color: var(--mist);
  padding: clamp(42px, 7vw, 92px) 0;
  overflow: hidden;
}

.page-about .about-rhythm::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(240, 138, 138, 0.22), rgba(240, 138, 138, 0) 68%);
  pointer-events: none;
}

.page-about .about-head--dark h2 {
  color: var(--mist);
}

.page-about .about-head--dark .eyebrow {
  color: var(--gold);
}

.page-about .about-head--dark .about-head__note {
  color: rgba(247, 244, 239, 0.82);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid rgba(247, 244, 239, 0.2);
}

.page-about .rhythm-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(247, 244, 239, 0.2);
}

.page-about .rhythm-item__when {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .rhythm-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 244, 239, 0.88);
  max-width: 62ch;
}

.page-about .rhythm-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .rhythm-top {
  margin-left: auto;
}

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

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

  .page-about .partner-item {
    grid-template-columns: 90px 1fr;
    gap: 20px;
    align-items: baseline;
  }

  .page-about .rhythm-item {
    grid-template-columns: 110px 1fr;
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(40px, 5vw, 68px);
  }

  .page-about .about-hero__media {
    margin-top: 18px;
  }

  .page-about .method-grid {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 60px);
    align-items: start;
  }

  .page-about .method-note {
    position: sticky;
    top: 84px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-tab,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .role-tab:hover,
  .page-about .role-tab:focus-visible {
    transform: none;
  }
}
<<<END>>>