.page-about {
  --about-line: var(--hair);
  --about-panel: rgba(20, 24, 26, .72);
  position: relative;
  display: block;
  overflow-x: clip;
  padding-bottom: clamp(40px, 7vw, 88px);
  background:
    radial-gradient(1100px 620px at 82% -12%, rgba(27, 74, 59, .6), transparent 68%),
    radial-gradient(760px 480px at -8% 44%, rgba(178, 84, 22, .12), transparent 72%),
    var(--c-stand);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.8;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(241, 235, 224, .028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(241, 235, 224, .028) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 76%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, #000 76%, transparent 100%);
}

.page-about .wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-rail);
}

.page-about .about-section {
  padding-block: clamp(44px, 7vw, 96px);
}

.page-about .mono {
  font-family: var(--font-mono);
}

.page-about .link-lime {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 242, 78, .45);
  transition: border-color .2s ease, color .2s ease;
}

.page-about .link-lime:hover {
  color: var(--c-lime-mist);
  border-bottom-color: var(--c-lime-mist);
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-fog);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(138, 154, 147, .55);
}

.page-about .breadcrumb__list a {
  color: var(--c-fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .breadcrumb__list a:hover {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(60px, 10vw, 136px) clamp(34px, 5vw, 60px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6.2vw, 70px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--c-cream);
  text-wrap: balance;
}

.page-about .about-hero .lead {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 48ch;
  font-size: clamp(15.5px, 1.6vw, 18.5px);
  line-height: 1.88;
  color: rgba(241, 235, 224, .84);
}

.page-about .about-hero__rail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-c);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: clamp(16px, 2.2vw, 24px);
  background: rgba(8, 17, 15, .58);
}

.page-about .about-stat__v {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--c-lime);
}

.page-about .about-stat__l {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--c-fog);
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-head__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(200, 242, 78, .3);
}

.page-about .about-head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.5vw, 29px);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--c-cream);
}

.page-about .about-head .section-title__rule {
  flex: 0 0 48px;
  align-self: center;
  display: block;
  height: 2px;
  background: var(--c-orange);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(241, 235, 224, .84);
}

/* ---------- 通用分栏与正文 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .prose p {
  margin: 0 0 1.15em;
  font-size: clamp(15px, 1.5vw, 16.8px);
  line-height: 1.92;
  color: rgba(241, 235, 224, .86);
}

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

.page-about .about-aside {
  align-self: start;
  padding: clamp(20px, 2.6vw, 30px);
  background: rgba(27, 74, 59, .5);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-a);
}

.page-about .about-aside__key {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-orange);
}

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

.page-about .about-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 14.5px;
  color: rgba(241, 235, 224, .88);
}

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

.page-about .about-list__k {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-fog);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  margin: 0;
  border-radius: var(--r-organic-a);
  overflow: hidden;
  background: rgba(8, 17, 15, .5);
  border: 1px solid var(--about-line);
}

.page-about .media-frame img,
.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame__caption {
  padding: 12px clamp(14px, 2vw, 20px);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--c-fog);
  border-top: 1px solid var(--about-line);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  padding-block: clamp(44px, 7vw, 96px);
}

.page-about .about-timeline__media {
  margin-bottom: clamp(30px, 4.4vw, 56px);
}

.page-about .tl {
  position: relative;
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, rgba(200, 242, 78, .45), rgba(200, 242, 78, .05) 94%, transparent);
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .tl__dot {
  position: absolute;
  top: 28px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-stand);
  border: 1px solid var(--c-lime);
  box-shadow: 0 0 0 4px rgba(200, 242, 78, .1);
}

.page-about .tl__card {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-c);
  box-shadow: var(--shadow-panel);
  transition: border-color .24s ease, background-color .24s ease, transform .24s ease;
}

.page-about .tl__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .tl__num {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-orange);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.55;
  color: var(--c-cream);
}

.page-about .tl__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.86;
  color: rgba(241, 235, 224, .8);
}

.page-about .tl__more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(241, 235, 224, .16);
}

.page-about .tl__more > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-lime);
}

.page-about .tl__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__more > summary::before {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(-45deg);
  transition: transform .2s ease;
}

.page-about .tl__more[open] > summary::before {
  transform: rotate(45deg);
}

.page-about .tl__more p {
  margin: 10px 0 0;
  font-size: 14.2px;
  line-height: 1.86;
  color: rgba(241, 235, 224, .74);
}

/* ---------- 内容资产 ---------- */

.page-about .about-asset-media {
  align-self: start;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 3.4vw, 44px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-b);
  overflow: hidden;
}

.page-about .about-stats > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: clamp(16px, 2.3vw, 26px);
  background: rgba(8, 17, 15, .55);
}

.page-about .about-stats__v {
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-lime);
  letter-spacing: -.01em;
}

.page-about .about-stats__l {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-fog);
}

/* ---------- 团队 ---------- */

.page-about .about-team-media {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about .filter-btn {
  appearance: none;
  padding: 8px 15px;
  border: 1px solid var(--hair-2);
  border-radius: 999px;
  background: transparent;
  color: rgba(241, 235, 224, .78);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .filter-btn:hover {
  background: var(--veil-hover);
  color: var(--c-cream);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--c-lime-mist);
  border-color: var(--c-lime-mist);
  color: var(--c-well);
  font-weight: 700;
}

.page-about .filter-status {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-fog);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 22px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  min-width: 0;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--veil);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-a);
  transition: border-color .22s ease, background-color .22s ease;
}

.page-about .team-card[hidden],
.page-about .team-card[data-shown="false"] {
  display: none;
}

.page-about .team-card__tag {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-lime);
}

.page-about .team-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17.5px;
  line-height: 1.55;
  color: var(--c-cream);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.86;
  color: rgba(241, 235, 224, .78);
}

.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-organic-c);
  overflow: hidden;
}

.page-about .flow__step {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: clamp(14px, 2vw, 20px);
  background: rgba(8, 17, 15, .62);
}

.page-about .flow__n {
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--c-orange);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14.4px;
  line-height: 1.6;
  color: rgba(241, 235, 224, .88);
}

/* ---------- 版本节奏 ---------- */

.page-about .cadence {
  display: block;
  width: 100%;
  height: auto;
  margin: clamp(18px, 2.8vw, 30px) 0 10px;
  overflow: visible;
}

.page-about .cadence-note {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--c-fog);
}

.page-about .cadence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
  align-self: start;
}

.page-about .cadence-card {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--c-orange);
  border-radius: 4px var(--r-soft) var(--r-soft) 4px;
  transition: transform .24s ease, border-color .24s ease, box-shadow .24s ease;
}

.page-about .cadence-card__k {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-orange);
}

.page-about .cadence-card__v {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--c-cream);
}

.page-about .cadence-card__d {
  margin: 0;
  font-size: 14.4px;
  line-height: 1.8;
  color: rgba(241, 235, 224, .76);
}

/* ---------- 合作与年度 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .partner-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .figure-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(27, 74, 59, .45);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--c-lime);
  border-radius: 4px var(--r-organic-c) var(--r-organic-c) 4px;
}

.page-about .figure-card--orange {
  background: rgba(178, 84, 22, .14);
  border-left-color: var(--c-orange);
}

.page-about .figure-card__v {
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-lime);
}

.page-about .figure-card--orange .figure-card__v {
  color: var(--c-orange);
}

.page-about .figure-card__l {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--c-cream);
}

.page-about .figure-card__d {
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(241, 235, 224, .72);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta-wrap {
  padding-block: clamp(28px, 5vw, 64px);
}

.page-about .about-cta {
  padding: clamp(26px, 4vw, 52px) clamp(22px, 3.5vw, 48px);
  background: linear-gradient(120deg, rgba(27, 74, 59, .92), rgba(8, 17, 15, .94) 72%);
  border: 1px solid var(--hair-2);
  border-radius: var(--r-organic-b);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--c-cream);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.2px;
  line-height: 1.88;
  color: rgba(241, 235, 224, .82);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

/* ---------- 悬停增强 ---------- */

@media (hover: hover) {
  .page-about .tl__card:hover {
    border-color: rgba(200, 242, 78, .38);
    background: rgba(20, 24, 26, .9);
    transform: translateY(-2px);
  }

  .page-about .cadence-card:hover {
    transform: translateY(-3px);
    border-left-color: var(--c-lime);
    box-shadow: var(--shadow-panel);
  }

  .page-about .team-card:hover {
    border-color: rgba(200, 242, 78, .34);
    background: var(--veil-hover);
  }
}

/* ---------- 窄屏以上 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-hero__rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-split--7-5 {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-split--8-4 {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .partner-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  /* 错位时间轴 */
  .page-about .tl {
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .tl::before {
    left: 50%;
  }

  .page-about .tl__item {
    padding-left: 0;
  }

  .page-about .tl__item:nth-child(odd) {
    padding-right: calc(50% + 46px);
  }

  .page-about .tl__item:nth-child(even) {
    padding-left: calc(50% + 46px);
  }

  .page-about .tl__dot {
    left: 50%;
    top: 30px;
    transform: translateX(-50%);
  }
}

@media (min-width: 1000px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cadence-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1180px) {
  .page-about .about-head__num {
    font-size: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .cadence-card,
  .page-about .team-card,
  .page-about .filter-btn,
  .page-about .tl__more > summary::before {
    transition: none;
  }
}