.page-about {
  --ab-pad-y: clamp(54px, 8vw, 104px);
  position: relative;
  background: var(--ink);
  color: var(--frost);
  overflow-x: clip;
}

/* ===== 通用区块 ===== */
.page-about .about-sec {
  position: relative;
  padding: var(--ab-pad-y) 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-sec--deep {
  background: var(--ink-deep);
}

.page-about .about-sec--band {
  background: var(--ink-band);
}

.page-about .about-next {
  border-bottom: 0;
}

.page-about .about-head {
  max-width: 66ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--starbright);
}

.page-about .about-head p:not(.eyebrow) {
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.95;
  color: var(--frost);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(120% 92% at 86% 0%, rgba(31, 168, 168, .18), transparent 62%),
    linear-gradient(178deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding: clamp(38px, 6vw, 80px) 0 clamp(46px, 7vw, 96px);
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .crumbs a:hover {
  color: var(--green);
}

.page-about .crumbs span[aria-current] {
  color: var(--frost);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 74px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--starbright);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--green);
  -webkit-text-stroke: 1px var(--green);
  text-stroke: 1px var(--green);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.95;
  color: var(--frost);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__media {
  align-self: end;
}

/* ===== 图片容器 ===== */
.page-about .media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--grid);
  background: var(--ink-deep);
}

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

.page-about .media__cap {
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--grid);
}

/* ===== 起点 ===== */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .origin__mark {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--grid);
}

.page-about .origin__year {
  font-family: var(--font-mono);
  font-size: clamp(46px, 11vw, 96px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--orange);
}

@supports ((-webkit-text-stroke: 1px #000)) {
  .page-about .origin__year {
    color: transparent;
    -webkit-text-stroke: 1px var(--orange);
  }
}

.page-about .origin__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .origin__body h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--starbright);
}

.page-about .origin__body p:not(.eyebrow) {
  margin: 16px 0 0;
  font-size: 17px;
  line-height: 1.95;
  color: var(--frost);
}

/* ===== 数据条 ===== */
.page-about .metric-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(30px, 4vw, 52px);
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .metric-bar li {
  background: var(--ink-deep);
  padding: 20px 16px 22px;
}

.page-about .m-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--green);
}

.page-about .m-unit {
  margin-left: 2px;
  font-size: .42em;
  letter-spacing: .06em;
}

.page-about .m-label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ===== 数据正文与信息图 ===== */
.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .data-copy p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.95;
  color: var(--frost);
}

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

/* ===== 团队 ===== */
.page-about .role-list {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-about .role-list li {
  padding: 24px 0 28px;
  border-bottom: 1px solid var(--grid);
}

.page-about .role-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .role-list h3 {
  margin: 10px 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--starbright);
}

.page-about .role-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

/* ===== 版本时间线 ===== */
.page-about .tl-banner {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .tl-list {
  display: grid;
  grid-template-columns: 1fr;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 28px;
  border-left: 1px solid var(--grid);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-time {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--teal);
  margin: 0;
}

.page-about .tl-title {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--starbright);
}

.page-about .tl-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--frost);
}

/* ===== 合作生态 ===== */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .partner-item {
  padding-top: 18px;
  border-top: 2px solid var(--teal);
}

.page-about .partner-item:nth-child(2) {
  border-top-color: var(--green);
}

.page-about .partner-item:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .partner-item h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--starbright);
}

.page-about .partner-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .partner-note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--red);
  font-size: 16px;
  line-height: 1.95;
  color: var(--frost);
}

/* ===== 下一步入口 ===== */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .next-item {
  display: block;
  padding: 26px 22px 30px;
  text-decoration: none;
  background: var(--ink-deep);
  transition: background .18s var(--ease);
}

.page-about .next-item:hover,
.page-about .next-item:focus-visible {
  background: var(--ink-band);
}

.page-about .next-item strong {
  display: block;
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--starbright);
}

.page-about .next-item:hover strong,
.page-about .next-item:focus-visible strong {
  color: var(--green);
}

.page-about .next-item span {
  display: block;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ===== 窄屏微调 ===== */
@media (max-width: 480px) {
  .page-about .metric-bar {
    grid-template-columns: 1fr;
  }

  .page-about .origin__mark {
    gap: 8px;
  }
}

/* ===== 中等屏幕 ===== */
@media (min-width: 720px) {
  .page-about .metric-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .metric-bar li {
    padding: 24px 18px 26px;
  }

  .page-about .role-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
    border-top: 0;
  }

  .page-about .role-list li {
    border-bottom: 0;
    border-top: 1px solid var(--grid);
  }

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

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

/* ===== 桌面端 ===== */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: end;
  }

  .page-about .origin-grid {
    grid-template-columns: 220px minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .origin__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--orange);
    padding-left: 18px;
  }

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

  .page-about .tl-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 26px;
    border-top: 1px solid var(--grid);
  }

  .page-about .tl-item {
    border-left: 0;
    padding: 32px 0 0;
  }

  .page-about .tl-item::before {
    left: 0;
    top: -4px;
  }
}

@media (min-width: 1120px) {
  .page-about .role-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 28px;
  }

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

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