.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-pad: clamp(48px, 8vw, 104px);
  --about-line: rgba(212, 162, 76, .38);
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

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

.page-about figure {
  margin: 0;
}

.page-about figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.7;
}

.page-about .section {
  padding-block: var(--about-pad);
}

.page-about .section__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.2;
  font-size: clamp(25px, 5vw, 40px);
  margin: 6px 0 20px;
}

.page-about .eyebrow {
  color: var(--red);
  font-size: 12.5px;
  letter-spacing: .18em;
  margin: 0;
}

.page-about .layout {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .stack > * + * {
  margin-top: 14px;
}

.page-about .layout__main p {
  max-width: 36em;
  line-height: 1.85;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 9vw, 112px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(circle at 84% 10%, rgba(200, 16, 46, .38), transparent 46%),
    radial-gradient(circle at 6% 92%, rgba(212, 162, 76, .20), transparent 54%),
    linear-gradient(158deg, var(--ink-green) 0%, var(--ink-green-deep) 64%, #081D18 100%);
  color: var(--ivory);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: auto -10% -34% -10%;
  height: 64%;
  background: radial-gradient(ellipse at 50% 100%, rgba(200, 16, 46, .30), transparent 70%);
  pointer-events: none;
  animation: about-lantern 6s ease-in-out infinite;
}

@keyframes about-lantern {
  0%, 100% { opacity: .62; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cover::before {
    animation: none;
  }
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-cover__eyebrow {
  color: var(--gold);
}

.page-about .about-cover__crumb {
  margin: 10px 0 0;
  font-size: 12.5px;
  color: rgba(246, 239, 227, .68);
}

.page-about .about-cover__crumb a {
  color: rgba(246, 239, 227, .86);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 162, 76, .5);
}

.page-about .about-cover__crumb a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-cover__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.08;
  font-size: clamp(34px, 8vw, 64px);
  margin: 12px 0 18px;
  color: var(--ivory);
}

.page-about .about-cover__lede {
  max-width: 34em;
  color: rgba(246, 239, 227, .86);
  font-size: clamp(15px, 2vw, 17.5px);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-cover__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cover .btn--onDark {
  color: var(--ivory);
  border-color: rgba(246, 239, 227, .55);
}

.page-about .about-cover__index {
  position: relative;
  padding: 18px 18px 10px;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: rgba(246, 239, 227, .06);
  backdrop-filter: blur(6px);
}

.page-about .about-cover__idxnote {
  color: rgba(246, 239, 227, .62);
  letter-spacing: .22em;
  font-size: 12px;
  margin: 0;
}

.page-about .about-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-index__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(212, 162, 76, .3);
}

.page-about .about-index__row:last-child {
  border-bottom: 0;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .about-index__unit {
  font-size: .52em;
  margin-left: 3px;
}

.page-about .about-index__label {
  font-size: 13px;
  color: rgba(246, 239, 227, .74);
}

/* ---------- 侧栏注释 ---------- */
.page-about .about-aside {
  border-left: 2px solid var(--about-line);
  padding-left: 18px;
}

.page-about .annot--vertical {
  writing-mode: vertical-rl;
  font-size: 12.5px;
  letter-spacing: .22em;
  color: var(--muted);
  margin: 0;
}

.page-about .about-aside__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-aside__list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-aside__list li:last-child {
  border-bottom: 0;
}

.page-about .about-aside__list span:first-child {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .about-aside__list span:last-child {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.65;
}

.page-about .about-aside__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-aside__hint {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-aside__hint a,
.page-about .about-ship__more a,
.page-about .about-keep__card a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-aside__hint a:hover,
.page-about .about-ship__more a:hover,
.page-about .about-keep__card a:hover {
  color: var(--ink);
}

.page-about .about-facts {
  margin: 16px 0 0;
}

.page-about .about-facts__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-facts dt {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: .04em;
  color: var(--ink);
}

/* ---------- 历程 ---------- */
.page-about .about-years {
  background: var(--paper);
}

.page-about .about-years__head {
  display: grid;
  gap: 16px;
}

.page-about .about-years__lede {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.85;
  max-width: 34em;
}

.page-about .about-years__fig {
  margin: 30px 0 34px;
}

.page-about .about-years__fig img {
  width: 100%;
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-lift);
}

.page-about .about-line .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--red);
  color: var(--ivory);
  border-color: var(--red);
}

.page-about .filter-count {
  margin: 0 0 0 auto;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(212, 162, 76, .12));
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 30px 36px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--red);
  border-radius: 50%;
  background: var(--ivory);
  box-sizing: content-box;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-tl__tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--red);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-tl__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ivory);
}

.page-about .about-team__fig {
  margin: 28px 0 0;
}

.page-about .about-team__fig img {
  width: 100%;
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-lift);
}

/* ---------- 线路 ---------- */
.page-about .about-net {
  background: linear-gradient(180deg, var(--paper) 0%, #EFE6D6 100%);
}

.page-about .about-net__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-net__stats .stat {
  flex: 1 1 132px;
  padding: 14px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: var(--ivory);
}

.page-about .about-net__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--red);
}

.page-about .about-net__stats .stat__label {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-net__fig img {
  width: 100%;
  border-radius: var(--radius-m);
  border: 1px solid rgba(18, 58, 50, .14);
}

/* ---------- 正式版内容 ---------- */
.page-about .about-ship {
  background: var(--ivory);
}

.page-about .about-ship__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-ship__item {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid rgba(20, 16, 14, .14);
}

.page-about .about-ship__item:last-child {
  border-bottom: 1px solid rgba(20, 16, 14, .14);
}

.page-about .about-ship__no {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-ship__box h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
}

.page-about .about-ship__box p {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .about-ship__more {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 长期做法 ---------- */
.page-about .about-keep {
  background: linear-gradient(155deg, var(--ink-green) 0%, var(--ink-green-deep) 100%);
  color: var(--ivory);
}

.page-about .about-keep .section__title {
  color: var(--ivory);
}

.page-about .about-keep .eyebrow {
  color: var(--gold);
}

.page-about .about-keep .annot--vertical {
  color: rgba(246, 239, 227, .6);
}

.page-about .about-keep__grid {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

.page-about .about-keep__card {
  border-top: 2px solid var(--gold);
  padding-top: 16px;
}

.page-about .about-keep__card h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--ivory);
}

.page-about .about-keep__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(246, 239, 227, .82);
}

.page-about .about-keep__card a {
  color: var(--cyan);
}

.page-about .about-keep__card a:hover {
  color: var(--ivory);
}

/* ---------- 合作引导 ---------- */
.page-about .about-cta {
  background: var(--red);
  color: var(--ivory);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 32px);
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--ivory);
}

.page-about .about-cta__inner p {
  margin: 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(246, 239, 227, .9);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--onDark {
  color: var(--ivory);
  border-color: rgba(246, 239, 227, .7);
}

.page-about .about-cta .btn--onDark:hover {
  background: var(--ivory);
  color: var(--red);
}

.page-about .about-cta .btn--ghost {
  color: var(--ivory);
  border-color: rgba(246, 239, 227, .55);
}

.page-about .about-cta .btn--ghost:hover {
  background: rgba(246, 239, 227, .14);
}

/* ---------- 响应式 ---------- */
@media (max-width: 979px) {
  .page-about .about-aside {
    border-left: 0;
    border-top: 1px solid var(--about-line);
    padding: 18px 0 0;
  }

  .page-about .about-aside .annot--vertical {
    writing-mode: horizontal-tb;
    letter-spacing: .16em;
  }
}

@media (min-width: 760px) {
  .page-about .about-ship__item {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .about-keep__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 32px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-years__head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
    gap: 36px;
  }

  .page-about .about-tl {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 0;
  }

  .page-about .about-tl::before {
    left: 8px;
    right: 8px;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--gold), rgba(212, 162, 76, .16));
  }

  .page-about .about-tl__item {
    padding: 38px 0 0;
  }

  .page-about .about-tl__item::before {
    left: 0;
    top: 1px;
  }

  .page-about .about-tl__item:hover::before,
  .page-about .about-tl__item:focus-within::before {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px -10px rgba(200, 16, 46, .75);
  }
}

@media (min-width: 980px) {
  .page-about .layout {
    grid-template-columns: minmax(0, 9fr) minmax(0, 3fr);
    gap: 48px;
  }

  .page-about .layout__aside {
    position: sticky;
    top: 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-keep__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item::before {
    transition: none;
  }
}