.page-about {
  background: var(--mist);
  color: var(--ink);
  --about-rule: rgba(6, 26, 19, 0.14);
}

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

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--grass);
  color: var(--mist);
  padding: clamp(1.4rem, 4vw, 2.4rem) 0 clamp(2.2rem, 6vw, 4rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(244, 247, 243, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 247, 243, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .crumbs {
  color: rgba(244, 247, 243, 0.72);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0.9rem 0 0;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 1.15rem 0 0;
  max-width: 30em;
  font-size: clamp(1rem, 1.7vw, 1.125rem);
  line-height: 1.82;
  color: rgba(244, 247, 243, 0.88);
}

.page-about .about-hero__media {
  margin: 0;
  background: var(--night);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

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

.page-about .about-hero__note {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

/* 数字带 */
.page-about .about-metrics {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--mist);
  padding: clamp(2rem, 6vw, 3.5rem) 0;
}

.page-about .about-metrics__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
}

.page-about .about-metrics::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(16, 26, 43, 0.94) 12%, rgba(12, 59, 42, 0.78) 100%);
}

.page-about .about-metrics__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-metrics__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem 1rem;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
}

.page-about .about-metric {
  display: grid;
  gap: 0.3rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line-cyan);
}

.page-about .about-metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-metric__label {
  font-size: 1rem;
  letter-spacing: 0.03em;
  color: var(--stand);
}

/* 正文布局与侧边章节轴 */
.page-about .about-flow {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(2.2rem, 6vw, 4.5rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

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

.page-about .about-rail__title {
  margin: 0 0 0.8rem;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--stand);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-rail__link {
  display: flex;
  gap: 0.55rem;
  align-items: baseline;
  padding: 0.5rem 0 0.5rem 0.85rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 0.92rem;
  color: var(--grass);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-left-color: var(--cyan);
  background: rgba(46, 230, 182, 0.1);
  color: var(--ink);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-rail__index {
  font-size: 0.7rem;
  color: var(--violet);
}

@media (min-width: 960px) {
  .page-about .about-flow {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 6.5rem;
  }
}

/* 章节 */
.page-about .about-section {
  scroll-margin-top: 6.5rem;
  padding-bottom: clamp(1.8rem, 4vw, 2.8rem);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-rule);
  padding-top: clamp(1.8rem, 4vw, 2.8rem);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--grass);
}

.page-about .about-kicker::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--about-rule);
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4.6vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  color: var(--ink);
  max-width: 22em;
}

.page-about .about-section__prose {
  max-width: 34em;
  line-height: 1.82;
}

.page-about .about-section__prose p {
  margin: 0 0 1em;
}

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

.page-about .about-section__more {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  margin: 1.4rem 0 0;
}

.page-about .about-link {
  font-weight: 700;
  color: var(--grass);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-link--light {
  color: var(--mist);
}

/* 团队分工 */
.page-about .about-roles {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.9rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-role__num {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--violet);
  line-height: 1.5;
}

.page-about .about-role__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-role__body p {
  margin: 0;
  max-width: 36em;
  line-height: 1.75;
  color: #1d3229;
}

/* 栏目体系 */
.page-about .about-channels {
  margin-top: 1.4rem;
  display: grid;
}

.page-about .about-channel {
  display: grid;
  gap: 0.4rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-channel:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-channel__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--grass);
}

.page-about .about-channel__text {
  margin: 0;
  max-width: 40em;
  line-height: 1.75;
  color: #1d3229;
}

@media (min-width: 720px) {
  .page-about .about-channel {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }
}

/* 版本演进时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0 0 0 1.4rem;
  border-left: 2px solid var(--about-rule);
  display: grid;
  gap: 1.2rem;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.4rem - 6px);
  top: 0.5rem;
  width: 10px;
  height: 10px;
  background: var(--violet);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--grass);
}

.page-about .about-timeline__card {
  background: var(--white);
  border: 1px solid var(--about-rule);
  padding: 0.95rem 1.1rem;
}

.page-about .about-timeline__card--now {
  background: var(--grass);
  border-color: var(--grass);
  color: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-timeline__card--now .about-timeline__title {
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-timeline__card p {
  margin: 0;
  line-height: 1.72;
  max-width: 38em;
  font-size: 0.96rem;
}

/* 编辑做法 */
.page-about .about-practice {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.3rem;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 1.05rem;
  max-width: 34em;
}

.page-about .about-steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.6rem;
  line-height: 1.78;
  color: #1d3229;
}

.page-about .about-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .about-practice__media {
  margin: 0;
  background: var(--sand);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

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

.page-about .about-practice__caption {
  display: block;
  padding: 0.65rem 1rem 0.8rem;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--grass);
}

@media (min-width: 760px) {
  .page-about .about-practice {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
  }
}

/* 结尾 */
.page-about .about-next {
  background: var(--night);
  color: var(--mist);
  padding: clamp(2.2rem, 6vw, 4rem) 0;
  border-top: 4px solid var(--cyan);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.2rem;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  color: var(--white);
}

.page-about .about-next__text p {
  margin: 0;
  max-width: 36em;
  line-height: 1.8;
  color: rgba(244, 247, 243, 0.82);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-next__note {
  margin: 0;
  font-size: 0.85rem;
}

@media (min-width: 880px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }

  .page-about .about-next__note {
    grid-column: 1 / -1;
  }
}