.page-about {
  background: var(--ink);
  color: var(--warm);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(40px, 7vw, 88px) 0 clamp(48px, 8vw, 100px);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 68% 50%;
  opacity: 0.44;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(100deg, rgba(14, 14, 14, 0.96) 0%, rgba(14, 14, 14, 0.76) 46%, rgba(42, 10, 15, 0.9) 100%),
    radial-gradient(120% 90% at 88% 16%, rgba(177, 18, 38, 0.34), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero h1 {
  margin: 20px 0 24px;
  max-width: 15ch;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 44ch;
  padding-left: 20px;
  border-left: 2px solid var(--red);
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.8;
  color: var(--warm-86);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero__meta .chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(52px, 8vw, 108px) 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
}

.page-about .about-block .h2 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-intro {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm-72);
}

/* ---------- 起点与今天 ---------- */
.page-about .about-origin__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 44px);
  margin-top: clamp(22px, 3.4vw, 38px);
}

.page-about .about-origin__cols p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm-72);
}

.page-about .about-origin__cols p:first-child {
  color: var(--warm-86);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(28px, 4.5vw, 52px);
}

.page-about .about-tl__rail {
  grid-column: 1;
  order: -1;
  padding: 14px 0;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-tl__rail .index-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cool);
}

.page-about .about-tl__rail .index-rail__list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-tl__rail .index-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-tl__rail .index-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: 13px;
  color: var(--warm-72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-tl__rail .index-rail__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-tl__rail .index-rail__link:hover {
  color: var(--warm);
}

.page-about .about-tl__rail .index-rail__link.is-active {
  color: var(--warm);
  border-bottom-color: var(--gold);
}

.page-about .about-tl__list {
  --tl-pad: clamp(20px, 3vw, 34px);
  grid-column: 1;
  display: grid;
  gap: clamp(32px, 4.6vw, 60px);
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  list-style: none;
  border-left: 1px solid var(--hair);
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad) - 5px);
  top: 10px;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  border: 1px solid var(--hair);
  background: var(--ink);
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-tl__item.is-visible::before {
  border-color: var(--gold);
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
}

.page-about .about-tl__year {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
}

.page-about .about-tl__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-tl__stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cool);
}

.page-about .about-tl__item .h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 1.9vw, 24px);
  line-height: 1.35;
  color: var(--warm);
}

.page-about .about-tl__item > p:last-child {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--warm-72);
}

.page-about .about-tl__figure {
  margin: 0 0 0 calc(-1 * var(--tl-pad) + 6px);
}

.page-about .about-figure,
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-figure img,
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--hair);
}

.page-about .about-figure figcaption,
.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--cool);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .about-reach__grid p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm-72);
}

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

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

.page-about .about-reach__facts li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-reach__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cool);
}

.page-about .about-reach__v {
  font-size: 15px;
  color: var(--warm);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .about-team__roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.6vw, 30px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__roles li {
  padding-top: 16px;
  border-top: 1px solid var(--hair);
}

.page-about .about-team__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-team__roles .h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .about-team__roles p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--warm-72);
}

/* ---------- 三件坚持的事 ---------- */
.page-about .about-holds__list {
  display: grid;
  gap: 0;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hair);
}

.page-about .about-holds__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(22px, 3vw, 34px) 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-holds__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan-lift);
}

.page-about .about-holds__list .h3 {
  margin: 0;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.4;
  color: var(--warm);
}

.page-about .about-holds__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--warm-72);
}

/* ---------- 运营数字 ---------- */
.page-about .about-numbers__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hair);
}

.page-about .about-numbers__list li {
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-numbers__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 54px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.page-about .about-numbers__num em {
  margin-left: 4px;
  font-style: normal;
  font-size: 0.42em;
  color: var(--cyan-lift);
}

.page-about .about-numbers__label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cool);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  background: linear-gradient(180deg, rgba(42, 10, 15, 0.78) 0%, rgba(14, 14, 14, 0.98) 100%);
}

.page-about .about-outro__statement {
  margin: 0;
  max-width: 30ch;
  font-size: clamp(20px, 2.6vw, 32px);
  line-height: 1.6;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--warm);
}

.page-about .about-outro__statement span {
  color: var(--gold);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .about-holds__list li {
    grid-template-columns: 64px minmax(0, 6fr) minmax(0, 7fr);
    align-items: baseline;
    gap: 0 20px;
  }

  .page-about .about-holds__idx {
    align-self: baseline;
  }

  .page-about .about-numbers__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-numbers__list li {
    padding: 30px 22px 30px 0;
    border-bottom: 0;
    border-left: 1px solid var(--hair-soft);
  }

  .page-about .about-numbers__list li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-numbers__list li:not(:first-child) {
    padding-left: 22px;
  }
}

@media (min-width: 860px) {
  .page-about .about-origin__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-tl {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }

  .page-about .about-tl__rail {
    grid-column: 2;
    grid-row: 1;
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding: 22px 20px;
    border: 1px solid var(--hair);
    background: rgba(42, 10, 15, 0.55);
  }

  .page-about .about-tl__rail .index-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-tl__rail .index-rail__list li + li {
    margin-top: 4px;
  }

  .page-about .about-tl__rail .index-rail__link {
    display: flex;
    width: 100%;
    white-space: normal;
  }

  .page-about .about-tl__list {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team__roles {
    grid-template-columns: 1fr;
    gap: clamp(22px, 2.4vw, 32px);
  }
}

@media (min-width: 1100px) {
  .page-about .about-team__figure {
    margin-top: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item::before,
  .page-about .about-tl__rail .index-rail__link {
    transition: none;
  }
}