.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .section {
  padding: 56px 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .breadcrumb {
  margin-bottom: 26px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--silver);
}

.page-about .breadcrumb__link {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.page-about .breadcrumb__current {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--deep);
  color: var(--paper);
  overflow: hidden;
  isolation: isolate;
}

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

.page-about .about-hero__shape-a {
  position: absolute;
  top: -14%;
  right: -12%;
  width: 74%;
  height: 128%;
  background: var(--bench);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .92;
}

.page-about .about-hero__shape-b {
  position: absolute;
  top: 0;
  right: -4%;
  width: 38%;
  height: 100%;
  background: var(--indigo);
  clip-path: polygon(58% 0, 100% 0, 100% 100%, 14% 100%);
  opacity: .78;
}

.page-about .about-hero__mesh {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(185, 194, 190, .16) 1px, transparent 1px),
    linear-gradient(rgba(185, 194, 190, .16) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: .6;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: 44px;
  padding-bottom: 60px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 8.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 6px 0 0;
  transform: rotate(-3deg);
  transform-origin: left top;
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 26px 0 0;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 32px 0 0;
}

.page-about .about-fact {
  padding: 14px 16px 16px;
  border-left: 3px solid var(--orange);
  background: rgba(16, 21, 20, .34);
  backdrop-filter: blur(2px);
}

.page-about .about-fact__label {
  font-size: 13px;
  color: var(--silver);
  margin: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1.1;
  font-weight: 700;
  color: var(--yellow);
  margin: 4px 0 0;
}

.page-about .about-fact__unit {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--gray);
}

/* ---------- 使命 ---------- */

.page-about .about-mission__inner {
  display: grid;
  gap: 34px;
}

.page-about .about-mission__title,
.page-about .about-crew__title,
.page-about .about-stages__title,
.page-about .about-verify__title,
.page-about .about-scale__title,
.page-about .about-next__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.015em;
  margin: 0 0 18px;
  transform: rotate(-2deg);
  transform-origin: left center;
}

.page-about .prose p {
  max-width: 46ch;
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.page-about .about-pledge {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--gray-2);
}

.page-about .about-pledge__item {
  position: relative;
  padding: 14px 0 14px 30px;
  border-bottom: 1px solid var(--gray-2);
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-pledge__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 12px;
  height: 3px;
  background: var(--orange);
  transform: rotate(-18deg);
}

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

.page-about .figure--cut .figure__media {
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
  border-radius: var(--r-organic);
  overflow: hidden;
  background: var(--deep);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.04);
}

.page-about .figure__cap {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ink-soft);
  border-left: 3px solid var(--orange);
  padding-left: 10px;
}

/* ---------- 团队 ---------- */

.page-about .about-crew {
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-crew__inner {
  display: grid;
  gap: 42px;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
}

.page-about .about-ring__seg {
  transition: stroke-width .22s ease;
}

.page-about .about-ring__seg:hover {
  stroke-width: 30;
}

.page-about .about-ring__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--yellow);
}

.page-about .about-ring__label {
  font-family: var(--font-body);
  font-size: 10px;
  fill: var(--gray);
}

.page-about .about-ring__legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-legend__dot {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  display: inline-block;
}

.page-about .about-legend__dot--a { background: var(--orange); }
.page-about .about-legend__dot--b { background: var(--yellow); }
.page-about .about-legend__dot--c { background: var(--silver); }

.page-about .about-ring__hint {
  margin: 12px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--silver);
}

.page-about .about-crew__lead {
  max-width: 44ch;
  margin: 0 0 26px;
  color: var(--gray);
  font-size: 15px;
}

.page-about .about-duty {
  padding: 20px 0 22px 20px;
  border-left: 3px solid var(--orange);
  border-bottom: 1px solid rgba(185, 194, 190, .28);
}

.page-about .about-duty:last-of-type {
  border-bottom: none;
}

.page-about .about-duty__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-duty__body {
  margin: 0 0 10px;
  font-size: 15px;
  color: var(--gray);
  max-width: 48ch;
}

.page-about .about-duty__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--yellow);
}

/* ---------- 时间轴 ---------- */

.page-about .about-stages {
  background: var(--paper);
  padding: 56px 0 0;
}

.page-about .about-stages__head {
  margin-bottom: 28px;
}

.page-about .about-stages__lead {
  max-width: 46ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.page-about .about-stages__figure {
  margin: 0 0 44px;
}

.page-about .about-stages__figure .figure__media {
  clip-path: polygon(0 6%, 100% 0, 100% 94%, 0 100%);
  overflow: hidden;
  background: var(--deep);
}

.page-about .about-stages__figure .figure__cap {
  max-width: var(--maxw);
  margin: 12px auto 0;
  padding-left: 10px;
}

.page-about .about-stages__inner {
  display: grid;
  gap: 26px;
  padding-bottom: 56px;
}

.page-about .about-stages__rail {
  display: none;
}

.page-about .about-stages__rail .rail__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
  margin: 0 0 12px;
}

.page-about .about-stages__rail .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--gray-2);
}

.page-about .about-stages__rail .rail__item {
  margin: 0;
}

.page-about .about-stages__rail .rail__link {
  display: block;
  padding: 10px 0 10px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: transform .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-stages__rail .rail__link:hover,
.page-about .about-stages__rail .rail__link:focus-visible,
.page-about .about-stages__rail .rail__link.is-active {
  color: var(--orange);
  border-left-color: var(--orange);
  transform: translateX(4px);
}

.page-about .about-stages__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  counter-reset: stage;
}

.page-about .about-stage {
  position: relative;
  padding: 26px 22px 26px 26px;
  border-radius: var(--r-organic);
  box-shadow: var(--shadow-1);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .about-stage--deep { background: var(--deep); color: var(--paper); }
.page-about .about-stage--deep2 { background: var(--deep-2); color: var(--paper); }
.page-about .about-stage--indigo { background: var(--indigo); color: var(--paper); }
.page-about .about-stage--bench { background: var(--bench); color: var(--paper); }

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--yellow);
  margin: 0;
  line-height: 1;
}

.page-about .about-stage__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(19px, 4.6vw, 26px);
  margin: 12px 0 10px;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .about-stage__body {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--gray);
  max-width: 48ch;
}

.page-about .about-stage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-about .about-stage .tag {
  background: rgba(247, 248, 246, .12);
  color: var(--paper);
  border: 1px solid rgba(247, 248, 246, .28);
}

.page-about .about-stage .tag--orange {
  background: var(--orange);
  color: var(--ink);
  border-color: var(--orange);
}

.page-about .about-stage .tag--yellow {
  background: var(--yellow);
  color: var(--ink);
  border-color: var(--yellow);
}

/* ---------- 校验机制 ---------- */

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

.page-about .about-verify__inner {
  display: grid;
  gap: 34px;
}

.page-about .about-verify__title {
  color: var(--deep);
}

.page-about .about-verify__lead {
  max-width: 46ch;
  margin: 0 0 26px;
  color: var(--ink-soft);
  font-size: 15px;
}

.page-about .about-verify__table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  font-size: 14px;
  box-shadow: var(--shadow-1);
}

.page-about .about-verify__caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-soft);
  padding-bottom: 8px;
}

.page-about .about-verify__table th,
.page-about .about-verify__table td {
  border: 1px solid var(--silver);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.page-about .about-verify__table thead th {
  background: var(--deep);
  color: var(--paper);
  font-weight: 700;
  font-size: 13px;
}

.page-about .about-verify__table tbody th {
  background: rgba(20, 81, 63, .08);
  color: var(--deep);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-verify__table tbody tr:hover {
  background: rgba(255, 106, 26, .1);
}

.page-about .about-verify__note {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
  border-left: 3px solid var(--orange);
  padding-left: 12px;
}

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

.page-about .about-verify__figure .figure__media {
  border-radius: var(--r-organic);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  background: var(--deep);
}

/* ---------- 规模 ---------- */

.page-about .about-scale {
  background: var(--indigo);
  color: var(--paper);
}

.page-about .about-scale__head {
  max-width: 62ch;
  margin-bottom: 34px;
}

.page-about .about-scale__lead {
  margin: 0;
  color: var(--gray);
  font-size: 15px;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
}

.page-about .about-stat {
  padding: 18px 18px 20px;
  background: rgba(16, 21, 20, .28);
  border-left: 3px solid var(--yellow);
  border-radius: 0 var(--r-organic);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 13px;
  color: var(--silver);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1.05;
  font-weight: 700;
  color: var(--yellow);
  margin: 6px 0 0;
}

.page-about .about-stat__unit {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-scale__note {
  margin: 28px 0 0;
  font-size: 13px;
  color: var(--silver);
  border-top: 1px solid rgba(185, 194, 190, .32);
  padding-top: 14px;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-next__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-next__title {
  color: var(--paper);
}

.page-about .about-next__lead {
  max-width: 44ch;
  margin: 0;
  color: var(--gray);
  font-size: 15px;
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: block;
  padding: 14px 18px;
  background: rgba(247, 248, 246, .06);
  border-left: 3px solid var(--orange);
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  transition: background-color .2s ease, transform .2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(255, 106, 26, .2);
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__inner {
    padding-top: 56px;
    padding-bottom: 84px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    max-width: 820px;
  }

  .page-about .about-fact {
    border-left: 3px solid var(--orange);
    margin-right: 16px;
    padding: 16px 18px 18px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-next__inner {
    grid-template-columns: 5fr 7fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .table__num,
  .page-about .about-verify__table td {
    font-size: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 88px 0;
  }

  .page-about .about-hero__shape-a {
    width: 62%;
  }

  .page-about .about-mission__inner {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-mission__figure {
    margin-top: 34px;
  }

  .page-about .about-crew__inner {
    grid-template-columns: 4fr 8fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-ring {
    margin: 0;
    max-width: 100%;
  }

  .page-about .about-ring__legend {
    justify-content: flex-start;
  }

  .page-about .about-ring__hint {
    text-align: left;
  }

  .page-about .about-stages {
    padding-top: 88px;
  }

  .page-about .about-stages__inner {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 48px;
    padding-bottom: 88px;
  }

  .page-about .about-stages__rail {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-stages__flow {
    gap: 26px;
  }

  .page-about .about-stage {
    padding: 32px 34px 34px 38px;
  }

  .page-about .about-stage:nth-child(even) {
    transform: translateX(22px);
  }

  .page-about .about-verify__inner {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-verify__figure {
    margin-top: 16px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    transform: rotate(-3deg) translateX(-6px);
  }

  .page-about .about-mission__figure {
    margin-top: 58px;
    margin-left: -28px;
  }

  .page-about .about-verify__figure {
    margin-right: -34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title,
  .page-about .about-mission__title,
  .page-about .about-crew__title,
  .page-about .about-stages__title,
  .page-about .about-verify__title,
  .page-about .about-scale__title,
  .page-about .about-next__title {
    transform: none;
  }

  .page-about .about-ring__seg,
  .page-about .about-next__link,
  .page-about .about-stages__rail .rail__link {
    transition: none;
  }

  .page-about .about-stage:nth-child(even) {
    transform: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible,
  .page-about .about-stages__rail .rail__link:hover,
  .page-about .about-stages__rail .rail__link:focus-visible,
  .page-about .about-stages__rail .rail__link.is-active {
    transform: none;
  }
}