.page-about {
  --about-rail-w: 172px;
  --about-line: rgba(43, 33, 24, 0.16);
  background: var(--paper);
  color: var(--brown);
  font-family: var(--font-sans);
  line-height: 1.75;
}

.page-about .about-readout {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 80;
  background: rgba(43, 33, 24, 0.12);
  pointer-events: none;
}
.page-about .about-readout__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--print), var(--orange) 45%, var(--orange-soft));
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1.4rem, 5vw, 3rem) 0 clamp(3.4rem, 9vw, 6rem);
  background: radial-gradient(130% 100% at 88% 0%, #17253f 0%, var(--ink-0) 52%, var(--ink-2) 100%);
  color: var(--cool);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(201, 212, 232, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 212, 232, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 90% at 72% 8%, #000 22%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 72% 8%, #000 22%, transparent 78%);
}
.page-about .about-hero__curve {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  display: block;
  width: 100%;
  height: clamp(34px, 6vw, 78px);
}
.page-about .about-hero__curve path {
  fill: var(--paper);
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}
@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .breadcrumb {
  margin: 0 0 1.1rem;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--cool-dim);
  opacity: 0.65;
}
.page-about .breadcrumb__link {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  border-bottom-color: var(--orange-soft);
}
.page-about .breadcrumb__current {
  color: var(--cool-dim);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--orange-soft);
}
.page-about .about-hero__kicker-line {
  width: 2.2rem;
  height: 2px;
  background: var(--orange);
}
.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(1.85rem, 6.4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: #fff;
  transform: skewX(-4deg);
  transform-origin: left bottom;
  text-wrap: balance;
}
.page-about .about-hero__lede {
  max-width: 40em;
  margin: 1.1rem 0 0;
  font-size: clamp(0.95rem, 2.6vw, 1.05rem);
  line-height: 1.85;
  color: var(--cool);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
  margin: 1.6rem 0 0;
  padding: 1rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(201, 212, 232, 0.18);
}
.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}
.page-about .about-hero__stats strong {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 3.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--green);
  letter-spacing: -0.01em;
}
.page-about .about-hero__stats span {
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--cool-dim);
}
.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 0.5rem;
  border: 1px solid rgba(201, 212, 232, 0.2);
  border-radius: var(--radius);
  background: rgba(17, 28, 51, 0.7);
  box-shadow: var(--shadow-stack);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: 2px;
}
.page-about .about-hero__cap {
  margin: 0.55rem 0 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.03em;
  color: var(--cool-dim);
}
.page-about .about-hero__note {
  display: none;
}
@media (min-width: 1120px) {
  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 2.4rem;
    right: 0;
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.32em;
    color: var(--cool-dim);
    opacity: 0.72;
  }
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: clamp(2rem, 6vw, 3.5rem) 0 clamp(3rem, 8vw, 5.5rem);
  background: var(--paper);
}
.page-about .about-shell {
  display: grid;
  gap: clamp(1.2rem, 4vw, 2.6rem);
}
@media (min-width: 940px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}
@media (min-width: 940px) {
  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
  }
}
.page-about .about-rail__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.28em;
  color: var(--warm);
}
.page-about .about-rail__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}
@media (min-width: 940px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--about-line);
  }
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0.3rem 0.7rem;
  font-size: 0.84rem;
  color: var(--warm);
  text-decoration: none;
  white-space: nowrap;
  background: transparent;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.06em;
  color: var(--print);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--brown);
  background: rgba(255, 106, 26, 0.08);
  border-color: rgba(255, 106, 26, 0.5);
}
.page-about .about-rail__link.is-active {
  color: var(--ink-1);
  background: rgba(255, 106, 26, 0.14);
  border-color: var(--orange);
}
@media (min-width: 940px) {
  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 0.5rem 0.75rem;
    white-space: normal;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: rgba(255, 106, 26, 0.45);
    border-radius: 0;
  }
  .page-about .about-rail__link.is-active {
    border-left-color: var(--orange);
    border-radius: 0;
    background: linear-gradient(90deg, rgba(255, 106, 26, 0.15), transparent 88%);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(1.7rem, 4.5vw, 2.8rem);
  min-width: 0;
}
.page-about .about-chapter {
  position: relative;
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px dashed rgba(43, 33, 24, 0.3);
  scroll-margin-top: 5.5rem;
}
.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
}
.page-about .about-chapter__num {
  flex: 0 0 auto;
  padding: 0.08rem 0.42rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--orange);
  background: rgba(255, 106, 26, 0.1);
  border: 1px solid rgba(255, 106, 26, 0.42);
  border-radius: 2px;
}
.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.25rem, 4.2vw, 1.85rem);
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: -0.015em;
  color: var(--brown);
  transform: skewX(-2.5deg);
  transform-origin: left bottom;
}
.page-about .about-chapter__lead {
  margin: 0 0 0.8rem;
  font-size: clamp(0.98rem, 2.8vw, 1.1rem);
  font-weight: 700;
  line-height: 1.7;
  color: var(--brown);
}
.page-about .about-chapter__body > p {
  margin: 0 0 0.85rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--brown);
}
.page-about .about-chapter__body > p:last-child {
  margin-bottom: 0;
}
.page-about .about-chapter a:not(.about-next__card):not(.about-top) {
  color: var(--print);
  text-underline-offset: 3px;
}

/* ---------- 三种读法 ---------- */
.page-about .about-reads {
  display: grid;
  gap: 0.7rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-reads__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
  padding: 0.85rem 0.9rem;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 -1px var(--paper-shadow);
}
.page-about .about-reads__tag {
  margin-top: 0.15rem;
  padding: 0.16rem 0.48rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.1em;
  color: #fff;
  white-space: nowrap;
  background: var(--orange);
  border-radius: 2px;
}
.page-about .about-reads__tag--blue {
  background: var(--blue);
}
.page-about .about-reads__tag--green {
  color: var(--ink-1);
  background: var(--green);
}
.page-about .about-reads__title {
  margin: 0 0 0.2rem;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--brown);
}
.page-about .about-reads__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--warm);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  margin: 1.2rem 0 0;
  padding: clamp(1rem, 3.5vw, 1.6rem) clamp(0.9rem, 3.5vw, 1.5rem);
  list-style: none;
  background: linear-gradient(160deg, var(--ink-1), var(--ink-0) 78%);
  border: 1px solid rgba(201, 212, 232, 0.14);
  border-radius: var(--radius);
  box-shadow: var(--shadow-stack);
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.35rem 1.6rem;
  outline: none;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0.32rem;
  top: 0.95rem;
  bottom: -0.1rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 154, 92, 0.72), rgba(255, 154, 92, 0.06));
}
.page-about .about-timeline__item:last-child::before {
  display: none;
}
.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(183, 255, 60, 0.16);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-within .about-timeline__dot {
  transform: scale(1.35);
  box-shadow: 0 0 0 7px rgba(183, 255, 60, 0.2);
}
.page-about .about-timeline__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
}
.page-about .about-timeline__title {
  margin: 0.15rem 0 0.35rem;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: #fff;
}
.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--cool);
}
.page-about .about-timeline__points {
  display: grid;
  gap: 0.25rem;
  margin: 0.5rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__points li {
  position: relative;
  padding-left: 0.9rem;
  font-size: 0.81rem;
  line-height: 1.7;
  color: var(--cool-dim);
  transition: color 0.2s ease;
}
.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.34rem;
  height: 0.34rem;
  background: var(--blue-soft);
  transform: rotate(45deg);
}
.page-about .about-timeline__item:hover .about-timeline__points li,
.page-about .about-timeline__item:focus-within .about-timeline__points li {
  color: var(--cool);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.1rem;
  margin-top: 1rem;
}
@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
  }
}
.page-about .about-team__fig {
  margin: 0;
}
.page-about .about-team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid rgba(43, 33, 24, 0.2);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 -1px var(--paper-shadow);
}
.page-about .about-team__fig figcaption {
  margin: 0.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.03em;
  color: var(--warm);
}
.page-about .about-team__copy > p {
  margin: 0 0 0.8rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--brown);
}
.page-about .about-team__copy .about-chapter__lead {
  font-size: clamp(0.98rem, 2.8vw, 1.08rem);
}
.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 560px) {
  .page-about .about-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.75rem 0.7rem;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--print);
}
.page-about .about-stat__label {
  font-size: 0.77rem;
  color: var(--warm);
}

/* ---------- 标准 ---------- */
.page-about .about-standard {
  display: grid;
  gap: 1rem;
  margin-top: 1.1rem;
  padding: clamp(1rem, 3.5vw, 1.5rem);
  background: linear-gradient(155deg, #16233d, var(--ink-0) 82%);
  border: 1px solid rgba(201, 212, 232, 0.14);
  border-radius: var(--radius);
}
@media (min-width: 780px) {
  .page-about .about-standard {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }
}
.page-about .about-standard__row {
  padding-top: 0.85rem;
  border-top: 2px solid rgba(183, 255, 60, 0.45);
}
.page-about .about-standard__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--green);
}
.page-about .about-standard__row h3 {
  margin: 0.3rem 0 0.35rem;
  font-size: 0.96rem;
  font-weight: 900;
  color: #fff;
}
.page-about .about-standard__row p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 0.7rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
  .page-about .about-partners__item--main {
    grid-row: span 2;
  }
}
.page-about .about-partners__item {
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}
.page-about .about-partners__item--main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--ink-1);
  border-color: rgba(201, 212, 232, 0.18);
}
.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 7vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--print);
}
.page-about .about-partners__item--main .about-partners__num {
  color: var(--green);
}
.page-about .about-partners__item h3 {
  margin: 0.35rem 0 0.25rem;
  font-size: 0.94rem;
  font-weight: 900;
  color: var(--brown);
}
.page-about .about-partners__item--main h3 {
  color: #fff;
}
.page-about .about-partners__item p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--warm);
}
.page-about .about-partners__item--main p {
  color: var(--cool);
}
.page-about .about-partners__note {
  margin: 1rem 0 0;
  font-size: 0.87rem;
  line-height: 1.85;
  color: var(--warm);
}

/* ---------- 城市 ---------- */
.page-about .about-city__fig {
  margin: 0 0 1rem;
  overflow: hidden;
  border: 1px solid rgba(43, 33, 24, 0.18);
  border-radius: var(--radius);
}
.page-about .about-city__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 入口 ---------- */
.page-about .about-next {
  display: grid;
  gap: 0.6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 720px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-next__card {
  display: block;
  height: 100%;
  padding: 0.95rem 1rem;
  text-decoration: none;
  background: var(--ink-1);
  border: 1px solid rgba(201, 212, 232, 0.16);
  border-bottom: 3px solid var(--orange);
  border-radius: var(--radius);
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  background: #16233d;
  border-bottom-color: var(--green);
}
.page-about .about-next__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
}
.page-about .about-next__card h3 {
  margin: 0.3rem 0;
  font-size: 0.98rem;
  font-weight: 900;
  color: #fff;
}
.page-about .about-next__card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--cool-dim);
}
.page-about .about-next__more {
  margin: 1rem 0 0;
  font-size: 0.86rem;
  line-height: 1.9;
  color: var(--warm);
}
.page-about .about-top {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 1.3rem;
  padding: 0 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--brown);
  text-decoration: none;
  border: 1px solid rgba(43, 33, 24, 0.3);
  border-radius: 999px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}