.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-top: calc(var(--announce-h) + var(--hdr-bar) + 26px);
  padding-bottom: clamp(48px, 8vw, 92px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 82% at 86% 6%, rgba(30, 95, 168, 0.34), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -16%;
  width: 50%;
  height: 130%;
  background: linear-gradient(160deg, rgba(200, 16, 46, 0.94) 0%, rgba(122, 12, 28, 0.5) 46%, rgba(11, 11, 12, 0) 100%);
  transform: skewX(-16deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-crumb,
.page-about .about-crumb a,
.page-about .about-crumb span {
  color: var(--ink-70);
  font-size: 13px;
}

.page-about .about-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0 0 clamp(26px, 5vw, 46px);
  padding: 0;
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--mist);
}

.page-about .about-crumb a:hover {
  color: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-hero__copy {
  display: grid;
  gap: 18px;
  align-content: end;
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
  margin: 0;
}

.page-about .about-idx--light {
  color: rgba(246, 247, 244, 0.62);
}

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

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: rgba(246, 247, 244, 0.78);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-hero__acts .btn--line {
  color: var(--paper);
  border-color: var(--line-ink);
}

.page-about .about-hero__acts .btn--line:hover {
  border-color: var(--paper);
  color: var(--paper);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line-ink);
  box-shadow: var(--shadow-2);
}

/* ---------- 主体：左索引 + 右内容 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  padding-top: clamp(46px, 8vw, 96px);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-side__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .about-side__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-side__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-side__link {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 14px 10px 0;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .about-side__link:hover {
  color: var(--ink);
}

.page-about .about-side__link.is-active {
  color: var(--ink);
  border-bottom-color: var(--red);
  font-weight: 600;
}

.page-about .about-side__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--mist);
}

.page-about .about-side__link.is-active .about-side__idx {
  color: var(--red);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--hdr-bar) + var(--announce-h) + 20px);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(58px, 9vw, 108px);
}

.page-about .about-sec__head {
  display: grid;
  gap: 12px;
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.5vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-sec__title--light {
  color: var(--paper);
}

.page-about .about-sec__lede {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(11, 11, 12, 0.7);
}

.page-about .about-sec__lede--light {
  color: rgba(246, 247, 244, 0.72);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 14px;
  display: grid;
  gap: 10px;
  border-left: 1px solid var(--line);
}

.page-about .about-tl__box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow-1);
}

.page-about .about-tl__sum {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--red);
  letter-spacing: 0.02em;
}

.page-about .about-tl__label {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
}

.page-about .about-tl__plus {
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--mist);
  text-align: center;
  transition: transform 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-tl__box[open] .about-tl__plus {
  transform: rotate(45deg);
  color: var(--red);
}

.page-about .about-tl__text {
  margin: 0;
  padding: 0 16px 18px 90px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(11, 11, 12, 0.68);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .about-keys__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 5px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-keys__n {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1.05;
  color: var(--ink);
}

.page-about .about-keys__t {
  font-size: 15px;
  font-weight: 700;
}

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

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  border-left: 2px solid var(--red);
  padding-left: 10px;
}

.page-about .about-cities {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 4vw, 36px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-city {
  background: #fff;
  padding: 20px 18px;
}

.page-about .about-city__name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-city__role {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.page-about .about-city__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-base {
  margin: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  gap: 14px;
  align-items: center;
}

.page-about .about-base img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-base__caption {
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm__item {
  background: var(--paper);
  padding: 22px 18px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-rhythm__n {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-rhythm__u {
  font-size: 13px;
  font-weight: 600;
  color: var(--red);
  letter-spacing: 0.02em;
}

.page-about .about-rhythm__d {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 20px 20px 18px;
  background: rgba(30, 95, 168, 0.06);
  border-left: 3px solid var(--blue);
  display: grid;
  gap: 12px;
  justify-items: start;
}

.page-about .about-note__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(11, 11, 12, 0.74);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 16, 46, 0.35);
  padding-bottom: 2px;
  transition: border-color 140ms var(--ease), color 140ms var(--ease);
}

.page-about .about-link::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-link:hover {
  color: var(--red-deep);
  border-bottom-color: var(--red-deep);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  background: var(--carbon);
  border-radius: var(--r);
  padding: clamp(26px, 5vw, 48px) clamp(20px, 4vw, 44px);
  box-shadow: var(--shadow-2);
}

.page-about .about-partners .about-sec__head {
  max-width: 56ch;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1px;
  background: var(--line-ink);
  border-top: 1px solid var(--line-ink);
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-partners__item {
  background: var(--carbon);
  padding: 22px 0;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-partners__n {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-partners__u {
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-partners__d {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-award {
  margin-top: clamp(22px, 4vw, 34px);
  display: grid;
  gap: 14px;
  align-items: start;
  padding: 20px 0 0;
  border-top: 1px dashed var(--line-ink);
}

.page-about .about-award__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--gold);
  padding: 5px 12px;
  border-radius: var(--r);
}

.page-about .about-award__t {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--paper);
}

.page-about .about-award__d {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-70);
}

/* ---------- 社区与场景 ---------- */
.page-about .about-scale {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__item {
  background: var(--paper);
  padding: 20px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-scale__n {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-scale__n em {
  font-style: normal;
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--mist);
}

.page-about .about-scale__n--jade {
  color: var(--jade);
}

.page-about .about-scale__c {
  font-size: 12.5px;
  color: var(--mist);
  letter-spacing: 0.03em;
}

.page-about .about-scenes {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 4vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scene {
  background: #fff;
  padding: 22px 18px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-scene__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .about-scene__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-scene .about-link {
  margin-top: 4px;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: linear-gradient(135deg, var(--red-deep) 0%, var(--red) 58%, var(--red-deep) 100%);
  color: var(--paper);
  padding: clamp(46px, 8vw, 88px) 0;
}

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

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(246, 247, 244, 0.84);
}

.page-about .about-next__links {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(246, 247, 244, 0.24);
  border-top: 1px solid rgba(246, 247, 244, 0.24);
  border-bottom: 1px solid rgba(246, 247, 244, 0.24);
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 4px;
  background: transparent;
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: padding-left 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-next__link::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 14px;
  opacity: 0.75;
}

.page-about .about-next__link:hover {
  padding-left: 12px;
  background: rgba(11, 11, 12, 0.14);
}

/* ---------- 响应式 ---------- */
@media (max-width: 719px) {
  .page-about .about-hero::after {
    width: 74%;
    right: -34%;
    opacity: 0.55;
  }
}

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

  .page-about .about-base,
  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 4vw, 40px);
  }

  .page-about .about-award {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: calc(var(--hdr-bar) + var(--announce-h) + 24px);
  }

  .page-about .about-side__list {
    display: grid;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-side__link {
    padding: 10px 12px;
    margin-bottom: 0;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-side__link.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--red);
  }

  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__plus,
  .page-about .about-link,
  .page-about .about-next__link,
  .page-about .about-side__link {
    transition: none;
  }
}