.page-about {
  --about-cycle: clamp(2.5rem, 6vw, 4.5rem);
  --about-hair: rgba(216, 180, 106, .18);
  --about-hair-soft: rgba(216, 180, 106, .1);
  --about-body-text: rgba(244, 232, 210, .82);
  --about-body-dim: rgba(244, 232, 210, .68);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 90% at 82% -10%, rgba(216, 180, 106, .16), transparent 62%),
    radial-gradient(90% 70% at 4% 108%, rgba(91, 30, 38, .42), transparent 70%),
    var(--ink-900);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: clamp(12rem, 34vw, 30rem);
  height: clamp(12rem, 34vw, 30rem);
  border: 1px solid var(--about-hair-soft);
  border-radius: 50% 50% 0 0;
  transform: translate(38%, 46%);
  pointer-events: none;
}

.page-about .crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crumbs__list > li + li::before {
  content: "/";
  margin-right: .45rem;
  color: rgba(184, 175, 161, .5);
}

.page-about .crumbs a {
  color: var(--gold);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--gold-light);
}

.page-about .about-hero__layout {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -.012em;
  margin: .55rem 0 1.15rem;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 36ch;
  margin: 0 0 1.85rem;
  font-size: clamp(.98rem, 1.6vw, 1.08rem);
  line-height: 1.9;
  color: var(--about-body-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media .media__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  box-shadow: 0 40px 80px -50px rgba(0, 0, 0, .95);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-hero__media .media__caption {
  display: block;
  margin-top: .8rem;
  font-family: var(--font-narrow);
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  border-top: 1px solid var(--about-hair);
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-about .about-fact__num {
  font-family: var(--font-narrow);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-fact__label {
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 档案正文双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 11.5rem minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 7.5rem;
  }
}

.page-about .about-index__title {
  margin: 0 0 1rem;
  font-family: var(--font-narrow);
  font-size: .78rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .1rem;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  margin-left: -1px;
  padding: .55rem .3rem .55rem .85rem;
  border-left: 1px solid transparent;
  color: var(--mist);
  font-size: .87rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--gold-light);
  border-left-color: var(--gold);
}

.page-about .about-index__num {
  font-family: var(--font-narrow);
  font-size: .84rem;
  letter-spacing: .08em;
  color: var(--gold);
}

@media (max-width: 1023px) {
  .page-about .about-index__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: .45rem;
    border-left: 0;
  }

  .page-about .about-index__link {
    margin-left: 0;
    padding: .42rem .85rem;
    border: 1px solid var(--about-hair);
    border-radius: 999px;
    font-size: .82rem;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-color: var(--gold);
  }
}

.page-about .about-dossier > * + * {
  margin-top: var(--about-cycle);
}

.page-about .about-chapter {
  scroll-margin-top: 7rem;
}

.page-about .about-chapter .section-title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.55rem, 2.9vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -.008em;
  margin: .35rem 0 1.15rem;
  color: var(--paper);
}

.page-about .about-copy p {
  max-width: 60ch;
  margin: 0 0 .95rem;
  font-size: 1rem;
  line-height: 1.92;
  color: var(--about-body-text);
}

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

/* ---------- 三条主线 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 1.85rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-pillar {
  position: relative;
  padding: 1.55rem 1.3rem 1.4rem;
  background: linear-gradient(158deg, var(--slate-700), var(--ink-800) 78%);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-pillar__num {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--gold);
  margin-bottom: .55rem;
}

.page-about .about-pillar h3 {
  margin: 0 0 .55rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--paper);
}

.page-about .about-pillar p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.82;
  color: var(--about-body-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 1.85rem 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 1.02rem;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(216, 180, 106, .3) 58%, rgba(216, 180, 106, 0));
}

.page-about .about-stop {
  position: relative;
  padding-left: 3.15rem;
}

.page-about .about-stop + .about-stop {
  margin-top: .35rem;
}

.page-about .about-stop__node {
  position: absolute;
  left: 0;
  top: .35rem;
  width: 2.05rem;
  height: 2.05rem;
  display: grid;
  place-items: center;
  font-family: var(--font-narrow);
  font-size: .84rem;
  letter-spacing: .06em;
  color: var(--dark-ink);
  background: var(--gold);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .about-ver__summary {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .55rem 0;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .about-ver__summary::marker {
  content: "";
}

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

.page-about .about-ver__idx {
  flex: none;
  min-width: 3.6rem;
  font-family: var(--font-narrow);
  font-size: .86rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-ver__name {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-ver[open] .about-ver__name {
  color: var(--gold-light);
}

.page-about .about-ver__mark {
  position: relative;
  flex: none;
  align-self: center;
  width: .72rem;
  height: .72rem;
}

.page-about .about-ver__mark::before,
.page-about .about-ver__mark::after {
  content: "";
  position: absolute;
  inset: 50% 0 auto;
  height: 1px;
  background: var(--gold);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-ver__mark::after {
  transform: rotate(90deg);
}

.page-about .about-ver[open] .about-ver__mark::after {
  transform: rotate(0deg);
}

.page-about .about-ver__body {
  padding: .2rem 0 .85rem;
}

.page-about .about-ver__body p {
  max-width: 58ch;
  margin: 0;
  font-size: .93rem;
  line-height: 1.86;
  color: var(--about-body-dim);
}

.page-about .about-archive {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
}

.page-about .about-archive img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  border-top: 1px solid var(--about-hair);
  filter: saturate(.9);
}

.page-about .about-archive figcaption {
  margin-top: .7rem;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 暖纸数据带 ---------- */
.page-about .about-band {
  scroll-margin-top: 7rem;
  padding: clamp(1.75rem, 4vw, 2.75rem);
  background: var(--paper);
  color: var(--dark-ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  box-shadow: 0 40px 90px -60px rgba(0, 0, 0, .95);
}

.page-about .about-band .eyebrow {
  color: var(--crimson);
}

.page-about .about-band .section-title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.55rem, 2.9vw, 2.3rem);
  line-height: 1.22;
  margin: .35rem 0 .9rem;
  color: var(--dark-ink);
}

.page-about .about-band__lede {
  max-width: 56ch;
  margin: 0 0 1.75rem;
  font-size: .97rem;
  line-height: 1.88;
  color: rgba(23, 16, 21, .72);
}

.page-about .about-band__grid {
  display: grid;
  gap: 1.6rem;
}

@media (min-width: 820px) {
  .page-about .about-band__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 2rem;
  }
}

.page-about .about-band__tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.35rem;
}

.page-about .about-band__tabs .tabs__tab {
  appearance: none;
  font-family: var(--font-narrow);
  font-size: .95rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .5rem 1.05rem;
  border: 1px solid rgba(23, 16, 21, .22);
  border-radius: 999px;
  background: transparent;
  color: rgba(23, 16, 21, .62);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-band__tabs .tabs__tab:hover {
  border-color: var(--copper);
  color: var(--dark-ink);
}

.page-about .about-band__tabs .tabs__tab[aria-selected="true"] {
  background: var(--dark-ink);
  border-color: var(--dark-ink);
  color: var(--gold-light);
}

.page-about .about-band__tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--crimson);
  outline-offset: 2px;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 1px;
  background: rgba(23, 16, 21, .16);
  border: 1px solid rgba(23, 16, 21, .16);
}

.page-about .about-stat {
  background: var(--paper);
  padding: 1.05rem .95rem 1.1rem;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-narrow);
  font-size: clamp(1.6rem, 3.4vw, 2.25rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--crimson);
  margin-bottom: .4rem;
}

.page-about .about-stat__label {
  display: block;
  font-size: .8rem;
  line-height: 1.5;
  color: rgba(23, 16, 21, .68);
}

.page-about .about-band__media {
  margin: 0;
}

.page-about .about-band__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.86) contrast(1.06);
}

.page-about .about-band__media figcaption {
  margin-top: .6rem;
  font-size: .76rem;
  letter-spacing: .05em;
  color: rgba(23, 16, 21, .6);
}

/* ---------- V3.1 改造 ---------- */
.page-about .about-upgrades {
  list-style: none;
  margin: 1.85rem 0 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-upgrade {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  padding: 1.35rem 1.3rem;
  background: rgba(36, 33, 40, .62);
  border-left: 1px solid var(--about-hair);
}

.page-about .about-upgrade__num {
  flex: none;
  font-family: var(--font-narrow);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--copper);
}

.page-about .about-upgrade__body h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--paper);
}

.page-about .about-upgrade__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.86;
  color: var(--about-body-dim);
}

@media (min-width: 900px) {
  .page-about .about-upgrade:nth-child(2) {
    margin-inline-start: clamp(1rem, 5vw, 4rem);
  }

  .page-about .about-upgrade:nth-child(3) {
    margin-inline-start: clamp(.5rem, 2.5vw, 1.9rem);
  }
}

/* ---------- 运营标准 ---------- */
.page-about .about-standards {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.85rem;
}

@media (min-width: 780px) {
  .page-about .about-standards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }
}

.page-about .about-standard {
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-standard__title {
  margin: 0 0 1rem;
  font-family: var(--font-narrow);
  font-size: .92rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-standard__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .about-standard__list li {
  position: relative;
  padding-left: 1.05rem;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--about-body-dim);
}

.page-about .about-standard__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .42rem;
  height: 1px;
  background: var(--copper);
}

.page-about .about-standard__list strong {
  color: var(--paper);
  font-weight: 500;
}

/* ---------- 荣誉 ---------- */
.page-about .about-awards {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

@media (min-width: 760px) {
  .page-about .about-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-award {
  padding: 1.65rem 1.4rem 1.5rem;
  background: linear-gradient(150deg, rgba(216, 180, 106, .16), rgba(36, 33, 40, .78) 62%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  border-top: 1px solid var(--gold);
}

.page-about .about-award--muted {
  background: linear-gradient(150deg, rgba(91, 30, 38, .55), rgba(20, 19, 23, .85) 66%);
  border-top-color: rgba(169, 104, 60, .7);
}

.page-about .about-award__year {
  margin: 0 0 .55rem;
  font-family: var(--font-narrow);
  font-size: 1.05rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold-light);
}

.page-about .about-award__name {
  margin: 0 0 .6rem;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.22rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-award__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--about-body-dim);
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-next__title {
  margin: 0 0 .9rem;
  font-family: var(--font-narrow);
  font-size: .82rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-about .about-next__link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem 1.05rem;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  color: var(--paper);
  font-size: .88rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-next__link::after {
  content: "→";
  color: var(--gold);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--dark-ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-next__link:hover::after,
.page-about .about-next__link:focus-visible::after {
  color: var(--dark-ink);
  transform: translateX(3px);
}

/* ---------- 焦点与动效 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--gold-light);
  outline-offset: 3px;
}

.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about.has-js [data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
  }

  .page-about.has-js [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 599px) {
  .page-about .about-band {
    clip-path: none;
  }

  .page-about .about-award {
    clip-path: none;
    border-left: 1px solid var(--about-hair);
  }

  .page-about .about-upgrade {
    flex-direction: column;
    gap: .6rem;
  }

  .page-about .about-hero__media .media__frame {
    aspect-ratio: 5 / 4;
  }
}