.page-about {
  --about-node: 10px;
  --about-card-pad: 22px;
}

.page-about .about-hero {
  position: relative;
  padding: 28px 0 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30px;
  left: -10%;
  right: -10%;
  height: 150px;
  background-image: repeating-linear-gradient(103deg, transparent 0 26px, rgba(43, 230, 168, 0.09) 26px 27px);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  margin-bottom: 26px;
  font-size: 0.8125rem;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__copy .kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--path);
  border: 1px solid var(--line);
  padding: 5px 10px;
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  line-height: 1.04;
  font-size: clamp(2.1rem, 7vw, 4.25rem);
  margin: 0 0 20px;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__media {
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-panel);
  margin: 0;
}

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

.page-about .media__cap {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  line-height: 1.6;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  margin-top: 30px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 9px;
  font-size: 0.8125rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--path);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--text);
  border-color: var(--line);
  background: var(--ink-800);
}

.page-about .about-body {
  display: grid;
  gap: 20px;
  padding-top: 36px;
  padding-bottom: 72px;
}

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

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-left: 4px solid var(--path);
  padding-left: 14px;
  margin-bottom: 26px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--amber);
  letter-spacing: 0.08em;
}

.page-about .about-sec__num::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--amber);
  margin-right: 8px;
  vertical-align: 2px;
}

.page-about .about-sec__title {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  margin: 0;
  line-height: 1.2;
}

.page-about .about-sec__intro {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 34em;
  margin: 0 0 22px;
}

.page-about .about-sec__body {
  margin-top: 22px;
}

.page-about .about-sec__body p {
  max-width: 34em;
  line-height: 1.8;
  color: var(--text);
  margin: 0 0 16px;
  font-size: 0.9688rem;
}

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

.page-about .about-sec__body a {
  color: var(--path);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 230, 168, 0.35);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-sec__body a:hover {
  color: var(--amber-soft);
  border-color: var(--amber);
}

.page-about .about-sec__action {
  margin-top: 26px;
}

.page-about .about-principles {
  display: grid;
  gap: 14px;
}

.page-about .about-principle {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: var(--about-card-pad);
  box-shadow: 0 8px 24px rgba(5, 15, 12, 0.45);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-principle:hover {
  border-color: rgba(43, 230, 168, 0.4);
}

.page-about .about-principle--lead {
  border-left: 4px solid var(--path);
  background-image: linear-gradient(155deg, rgba(22, 56, 47, 0.9), rgba(15, 42, 35, 0.95));
}

.page-about .about-principle__kicker {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin: 0 0 10px;
}

.page-about .about-principle__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--text);
}

.page-about .about-principle p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

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

.page-about .about-principle__path {
  display: inline-block;
  margin-top: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--path);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.page-about .about-team {
  display: grid;
  gap: 24px;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 14px;
  padding: 15px 10px 15px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.2s var(--ease), padding-left 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-team__row:hover {
  background: rgba(43, 230, 168, 0.05);
  padding-left: 10px;
  box-shadow: inset 4px 0 0 var(--path);
}

.page-about .about-team__role {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9688rem;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

.page-about .about-team__row:hover .about-team__role {
  color: var(--path);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.125rem;
  color: var(--amber);
  justify-self: end;
  line-height: 1.1;
}

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 0.9063rem;
  line-height: 1.7;
  transition: color 0.2s var(--ease);
}

.page-about .about-team__row:hover .about-team__desc {
  color: var(--text);
}

.page-about .about-data {
  display: grid;
  gap: 20px;
}

.page-about .about-data__flow {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 4px solid var(--path);
  padding: 20px;
}

.page-about .about-data__step {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.6;
}

.page-about .about-data__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--path);
  min-width: 2.4em;
  line-height: 1.1;
}

.page-about .about-data__arrow {
  margin: 6px 0 6px 0.4em;
  color: var(--amber);
  font-size: 0.875rem;
  line-height: 1;
}

.page-about .about-data__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.25rem, 4vw, 1.6rem);
  font-weight: 700;
  color: var(--path);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-stats__label {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-timeline {
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__track {
  position: relative;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(178px, 1fr);
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 30px 0 0;
  min-width: 100%;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 8px;
  height: 1px;
  background: linear-gradient(90deg, var(--path) 0%, rgba(43, 230, 168, 0.45) 55%, rgba(43, 230, 168, 0.08) 100%);
}

.page-about .about-mile {
  position: relative;
  padding-top: 4px;
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  top: -22px;
  left: 0;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 165, 61, 0.14);
}

.page-about .about-mile__box {
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-mile__box:hover,
.page-about .about-mile__box[open] {
  border-color: rgba(43, 230, 168, 0.45);
}

.page-about .about-mile__sum {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
}

.page-about .about-mile__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-mile__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .about-mile__name {
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.5;
}

.page-about .about-mile__sum::after {
  content: "展开";
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-top: 4px;
}

.page-about .about-mile__box[open] .about-mile__sum::after {
  content: "收起";
  color: var(--path);
}

.page-about .about-mile__note {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 0.8438rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .about-contact {
  display: grid;
  gap: 24px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  padding: var(--about-card-pad);
}

.page-about .about-contact__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1875rem;
  margin: 0 0 12px;
  color: var(--text);
}

.page-about .about-contact__main p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 32em;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-contact__list {
  margin: 0;
  border-top: 1px solid var(--line);
  padding-top: 4px;
}

.page-about .about-contact__list dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--path);
  margin-top: 14px;
}

.page-about .about-contact__list dd {
  margin: 4px 0 0;
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.6;
  word-break: break-word;
}

@media (min-width: 700px) {
  .page-about .about-data {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-contact__list {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 24px;
  }

  .page-about .about-contact__list dt:first-of-type {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 36px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: 44px;
  }

  .page-about .about-hero__media {
    -webkit-mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0.35), #000 62%);
    mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0.35), #000 62%);
  }

  .page-about .about-principles {
    grid-template-columns: 2fr 1fr 1fr;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-team__media {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding-top: 16px;
    border-right: 1px solid var(--line);
    min-height: 240px;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 0;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s var(--ease), transform 0.2s var(--ease);
  }

  .page-about .about-rail__link::before {
    content: "";
    width: 7px;
    height: 7px;
    border: 1px solid var(--line);
    background: transparent;
    transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--path);
    transform: translateX(4px);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--path);
    border-color: var(--path);
  }

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

  .page-about .about-timeline__track {
    grid-auto-columns: minmax(200px, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-team__row,
  .page-about .about-rail__link,
  .page-about .about-index__link,
  .page-about .about-mile__box {
    transition-duration: 0.12s;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: none;
  }
}