.page-about {
  --about-pad-y: clamp(48px, 7vw, 92px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
}

.page-about .about-section {
  padding: var(--about-pad-y) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section .container {
  position: relative;
}

.page-about .section-head {
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-about .about-lede {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 96px);
  opacity: 0.32;
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 5vw, 44px);
}

.page-about .about-hero .kicker {
  margin: 0 0 clamp(8px, 1.6vw, 14px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__year-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .about-hero__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(64px, 19vw, 190px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 2px var(--line);
}

.page-about .about-hero__title {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.6vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.84;
}

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

.page-about .about-facts .kicker {
  margin: 0 0 14px;
}

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

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .about-facts__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-facts__item dt {
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.02em;
}

.page-about .about-facts__item dd {
  margin: 0;
  text-align: right;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-facts__item .mono {
  font-family: var(--font-mono);
  font-size: 19px;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 沿革 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
  text-decoration: none;
  border: 1px dashed var(--line);
  clip-path: polygon(7px 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%, 0 7px);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-history__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-left: 22px;
  border-left: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--steel);
  transform: rotate(45deg);
}

.page-about .about-timeline__item--now::before {
  background: var(--cyan);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--steel);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--cyan);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
}

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

/* ---------- 图片位 ---------- */
.page-about .media-frame {
  margin: 0;
  position: relative;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
  border-top: 1px solid var(--line);
}

.page-about .media-frame--grid {
  border-color: var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-role {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: #1b2b38;
  transform: translateY(-3px);
}

.page-about .about-role__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-role__name {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-role__duty {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .about-role__mate {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel);
  opacity: 0.6;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-role:hover .about-role__mate,
.page-about .about-role:focus-within .about-role__mate {
  opacity: 1;
  color: var(--cyan);
}

.page-about .about-team__media {
  margin-top: clamp(24px, 4vw, 40px);
}

/* ---------- 资料库（浅色块） ---------- */
.page-about .about-library {
  background: var(--pale);
  color: var(--ink);
  border-top: 0;
}

.page-about .about-library .section-head__title {
  color: var(--ink);
}

.page-about .about-library .section-head__index {
  color: #0d7a6a;
}

.page-about .about-library .about-lede {
  color: rgba(11, 22, 32, 0.68);
}

.page-about .about-library__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(16px, 2.6vw, 30px);
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .about-stat {
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6.4vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-stat--fee .about-stat__num {
  color: #b45f00;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  color: rgba(11, 22, 32, 0.64);
}

.page-about .about-library__rhythm {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  display: grid;
  gap: 12px;
  border-top: 1px dashed rgba(11, 22, 32, 0.26);
}

.page-about .about-library__rhythm li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(11, 22, 32, 0.82);
}

.page-about .about-library__rhythm .mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: #0d7a6a;
  min-width: 88px;
}

.page-about .about-library__link {
  display: inline-block;
  margin-top: 20px;
  padding-bottom: 2px;
  font-size: 14px;
  color: #0b5c52;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color var(--dur) var(--ease);
}

.page-about .about-library__link:hover,
.page-about .about-library__link:focus-visible {
  color: var(--ink);
}

/* ---------- 服务网络 ---------- */
.page-about .about-scale {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-scale svg {
  display: block;
  width: 100%;
  height: clamp(44px, 7vw, 80px);
}

.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 40px);
  align-items: start;
}

.page-about .about-network__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-network__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-network__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-network__list .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--ink-deep);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about .about-eco__item {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-eco__num--amber {
  color: var(--amber);
}

.page-about .about-eco__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 品牌主张 ---------- */
.page-about .about-claim__box {
  position: relative;
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 52px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 44px) 0, 100% 44px, 100% 100%, 0 100%);
}

.page-about .about-claim__box::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--cyan);
}

.page-about .about-claim__box h2 {
  margin: 16px 0 14px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 46px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-claim__box p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-claim__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-claim__note {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-network__list li {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 8px 20px;
  }

  .page-about .about-timeline__item::before {
    top: 12px;
  }
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.62fr);
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    padding-left: 28px;
    gap: 10px 32px;
  }

  .page-about .about-timeline__body h3 {
    margin-top: -4px;
  }
}

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

  .page-about .about-claim__box {
    padding-right: clamp(48px, 6vw, 96px);
  }
}

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

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