.page-about {
  --about-pad: clamp(48px, 7vw, 104px);
  --about-gap: clamp(28px, 4vw, 56px);
  --about-num: 44px;
  position: relative;
}

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

.page-about .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(36px, 5vw, 72px) clamp(48px, 7vw, 96px);
  overflow: hidden;
}

.page-about .about-hero__wash {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.page-about .about-hero__wash::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -16%;
  width: min(74vw, 860px);
  aspect-ratio: 1 / 0.86;
  background: linear-gradient(158deg, var(--graphite) 0%, rgba(23, 27, 34, 0.42) 56%, rgba(11, 13, 17, 0) 100%);
  clip-path: polygon(26% 0, 100% 0, 74% 100%, 0 100%);
  transform: rotate(-5deg);
}

.page-about .about-hero__wash::after {
  content: "";
  position: absolute;
  top: 14%;
  right: 0;
  width: min(48vw, 540px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--red) 44%, transparent);
  opacity: 0.85;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.page-about .about-hero__copy > .eyebrow {
  display: block;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb li {
  color: var(--silver);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--slate);
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--green);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6.6vw, 4.1rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--silver);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--green);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

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

.page-about .about-hero__media .media-frame {
  border: 1px solid var(--line-strong);
  border-radius: 0;
}

.page-about .media-cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--slate);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  position: relative;
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--mast-h) + var(--bar-h) + 16px);
}

.page-about .about-section__head {
  display: grid;
  grid-template-columns: var(--about-num) minmax(0, 1fr);
  align-items: start;
  gap: 6px 18px;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .about-num {
  display: inline-grid;
  place-items: center;
  width: var(--about-num);
  height: var(--about-num);
  background: var(--umber);
  border: 1px solid rgba(134, 255, 110, 0.28);
  color: var(--green);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-about .about-section__head h2 {
  margin: 4px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--silver);
}

.page-about .prose p {
  max-width: 60ch;
  margin: 0 0 1.1em;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--silver);
}

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

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-section__grid > * {
  min-width: 0;
}

/* ---------- 01 起点与时间轴 ---------- */

.page-about .about-origin__lede {
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-timeline {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0 0 16px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 clamp(206px, 62vw, 250px);
  scroll-snap-align: start;
  padding: 28px 22px 6px 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--blue);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--green);
}

.page-about .about-timeline__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--silver);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 02 奶油底校验段 ---------- */

.page-about .about-section--paper {
  background: var(--parchment);
  border-top-color: transparent;
  color: var(--umber);
}

.page-about .about-section--paper .about-num {
  background: var(--umber);
  border-color: rgba(241, 234, 217, 0.3);
  color: var(--parchment);
}

.page-about .about-section--paper .about-section__head h2 {
  color: var(--umber);
}

.page-about .about-paper__lede p,
.page-about .about-paper__lede {
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: rgba(36, 26, 20, 0.78);
}

.page-about .about-paper__lede {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-checks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(36, 26, 20, 0.18);
  border: 1px solid rgba(36, 26, 20, 0.18);
}

.page-about .about-check {
  padding: clamp(22px, 3vw, 30px);
  background: var(--parchment);
}

.page-about .about-check__step {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--red-press);
}

.page-about .about-check h3 {
  margin: 12px 0 12px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--umber);
}

.page-about .about-check p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.74;
  color: rgba(36, 26, 20, 0.82);
}

.page-about .about-check__note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(36, 26, 20, 0.2);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: rgba(36, 26, 20, 0.6) !important;
}

/* ---------- 03 团队 ---------- */

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

.page-about .about-team__media .media-frame {
  border: 1px solid var(--line-strong);
}

.page-about .about-team__list {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__key {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-team__item p {
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 04 覆盖与规模 ---------- */

.page-about .about-scale__media {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-scale__media .media-frame {
  border: 1px solid var(--line-strong);
}

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

.page-about .about-stat {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ink);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-stat__value {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--silver);
}

.page-about .about-stat__unit {
  margin-inline-start: 6px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--slate);
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.62;
  color: var(--slate);
}

/* ---------- 05 约定 ---------- */

.page-about .about-promise {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-promise__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-promise dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--green);
}

.page-about .about-promise dd {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.74;
  color: var(--silver);
}

/* ---------- 06 出口卡片 ---------- */

.page-about .about-section--next {
  padding-bottom: calc(var(--about-pad) * 1.1);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__card {
  position: relative;
  display: block;
  padding: clamp(22px, 3vw, 32px);
  background: var(--ink);
  color: inherit;
  text-decoration: none;
  transition: background 0.24s var(--ease);
}

.page-about .about-next__card::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 3px;
  background: var(--red);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.28s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--graphite);
}

.page-about .about-next__card:hover::before,
.page-about .about-next__card:focus-visible::before {
  transform: scaleY(1);
}

.page-about .about-next__tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .about-next__card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--silver);
}

.page-about .about-next__card p {
  margin: 0;
  max-width: 42ch;
  font-size: 0.97rem;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-next__go {
  display: block;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--green);
  transition: transform 0.24s var(--ease);
}

.page-about .about-next__card:hover .about-next__go {
  transform: translateX(6px);
}

/* ---------- 媒体查询 ---------- */

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-stat__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
  }

  .page-about .about-stat:hover .about-stat__note,
  .page-about .about-stat:focus-within .about-stat__note {
    max-height: 8rem;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (hover: none) {
  .page-about .about-stat__note {
    margin-top: 12px;
  }
}

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

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

  .page-about .about-promise__row {
    grid-template-columns: minmax(0, 9rem) minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

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

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

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

  .page-about .about-team__item {
    grid-template-columns: minmax(0, 8rem) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}