.page-about {
  --about-rail-w: 208px;
  --about-gap-y: clamp(44px, 6vw, 88px);
  --about-rule: rgba(26, 20, 16, 0.14);
  --about-rule-soft: rgba(26, 20, 16, 0.08);
  --about-body-ink: rgba(26, 20, 16, 0.84);
  --about-soft-ink: rgba(26, 20, 16, 0.6);
  background: var(--cream);
  color: var(--brown);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--mist);
  padding-top: calc(var(--header-h) + clamp(30px, 5vw, 66px));
  padding-bottom: clamp(44px, 6vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -26%;
  width: 78%;
  height: 150%;
  background: linear-gradient(155deg, var(--ink-800) 0%, var(--ink-750) 100%);
  transform: rotate(13deg);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: clamp(90px, 16vw, 220px);
  height: 5px;
  background: var(--orange);
  z-index: 2;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 4vw, 54px);
  align-items: center;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: 13px;
  color: rgba(232, 238, 244, 0.6);
}

.page-about .about-crumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 238, 244, 0.3);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 80px);
  line-height: 0.99;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 54ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(232, 238, 244, 0.8);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  row-gap: 14px;
  border-top: 1px solid rgba(143, 163, 184, 0.26);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 16px 20px 0 0;
  margin-right: 20px;
  border-right: 1px solid rgba(143, 163, 184, 0.2);
}

.page-about .about-hero__meta li:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-about .about-hero__meta-num {
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-hero__meta-label {
  font-size: 13px;
  color: rgba(232, 238, 244, 0.64);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 14 / 9;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-900);
  background: var(--cyan);
}

/* ---------- 双轨骨架 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
  padding-top: var(--about-gap-y);
  padding-bottom: var(--about-gap-y);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--red);
}

.page-about .about-rail__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-rail .toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 11px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-soft-ink);
  text-decoration: none;
  border: 1px solid var(--about-rule);
  background: transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-rail .toc-link:hover,
.page-about .about-rail .toc-link:focus-visible,
.page-about .about-rail .toc-link.is-active {
  color: var(--brown);
  border-color: var(--red);
  background: rgba(226, 72, 42, 0.06);
}

.page-about .about-rail .toc-num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--red);
}

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

/* ---------- 章节通用 ---------- */

.page-about .about-sec {
  padding: clamp(30px, 4vw, 52px) 0;
  border-top: 1px solid var(--about-rule);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-sec:last-child {
  padding-bottom: 0;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  align-items: start;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-sec__num {
  padding-top: 9px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--brown);
}

.page-about .about-prose {
  max-width: 68ch;
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.9;
  color: var(--about-body-ink);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
}

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

.page-about .about-prose strong {
  color: var(--brown);
  font-weight: 700;
  box-shadow: inset 0 -0.42em 0 rgba(255, 107, 44, 0.22);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--red) 0%, rgba(226, 72, 42, 0.1) 100%);
}

.page-about .about-tl {
  position: relative;
  padding-bottom: clamp(20px, 2.6vw, 32px);
}

.page-about .about-tl:last-child {
  padding-bottom: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 13px;
  height: 13px;
  background: var(--cream);
  border: 1px solid var(--red);
  transform: rotate(45deg);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin-bottom: 9px;
  padding: 2px 9px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--red);
  border: 1px solid rgba(226, 72, 42, 0.42);
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-size: clamp(16.5px, 1.5vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--brown);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-ink);
}

/* ---------- 图形容器 ---------- */

.page-about .about-figure {
  margin: clamp(24px, 3vw, 38px) 0 0;
  border: 1px solid var(--about-rule);
  background: var(--mist);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-rule);
  background: var(--cream);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--about-soft-ink);
}

/* ---------- 团队卡片 ---------- */

.page-about .about-teams {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-team {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--cream);
  transition: background-color 0.18s ease;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--red);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.22s ease;
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  background: #fbf8f1;
}

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

.page-about .about-team__head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 10px;
}

.page-about .about-team__dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--red);
}

.page-about .about-team__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--brown);
  transition: color 0.18s ease;
}

.page-about .about-team:hover .about-team__name,
.page-about .about-team:focus-within .about-team__name {
  color: var(--red);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body-ink);
}

/* ---------- 内容覆盖清单 ---------- */

.page-about .about-cov {
  list-style: none;
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-cov__row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 3px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-cov__num {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-cov__title {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--brown);
}

.page-about .about-cov__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body-ink);
}

/* ---------- 数据面板 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  background: rgba(143, 163, 184, 0.22);
  border-left: 4px solid var(--orange);
}

.page-about .about-stats__item {
  padding: clamp(18px, 2.4vw, 28px) clamp(16px, 2vw, 24px);
  background: var(--ink-800);
}

.page-about .about-stats__num {
  display: block;
  margin-bottom: 8px;
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(232, 238, 244, 0.72);
}

/* ---------- 联系与行动 ---------- */

.page-about .about-contact {
  list-style: none;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-contact li {
  padding: 18px;
  background: var(--cream);
}

.page-about .about-contact__label {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
}

.page-about .about-contact__value {
  display: block;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--brown);
  word-break: break-word;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

@media (min-width: 860px) {
  .page-about .about-cov__row {
    grid-template-columns: 40px 190px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
    padding: 16px 0;
  }

  .page-about .about-cov__num {
    grid-row: auto;
    padding-top: 0;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-rail .toc-link {
    padding: 10px 0;
    border: 0;
    border-bottom: 1px solid transparent;
    font-size: 14px;
    background: transparent;
  }

  .page-about .about-rail .toc-link:hover,
  .page-about .about-rail .toc-link:focus-visible {
    background: transparent;
  }
}

@media (min-width: 1180px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-team::before,
  .page-about .about-team__name,
  .page-about .about-rail .toc-link,
  .page-about .about-crumb a {
    transition: none;
  }
}