.page-about {
  --about-hair: 1px solid var(--coal-700);
  --about-soft: rgba(184, 255, 60, 0.08);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 36px) 0 clamp(34px, 5vw, 62px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -16%;
  right: -18%;
  width: min(840px, 86vw);
  height: min(540px, 68vw);
  background:
    linear-gradient(148deg,
      rgba(7, 46, 38, 0.96) 0%,
      rgba(11, 15, 14, 0.97) 56%,
      rgba(184, 255, 60, 0.14) 100%);
  border: 1px solid var(--coal-700);
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
}

.page-about .about-kicker {
  color: var(--lime-400);
  margin: 0 0 clamp(12px, 1.8vw, 20px);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  font-size: clamp(38px, 7.6vw, 92px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.025em;
  max-width: 13em;
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 17.5px);
  line-height: 1.9;
  color: var(--white-050);
  opacity: 0.86;
}

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

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: end;
  }
}

/* ---------- 索引框架 ---------- */
.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: clamp(40px, 6vw, 82px);
}

.page-about .about-rail {
  display: none;
}

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

.page-about .about-rail__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 0;
  border-left: 1px solid var(--coal-700);
  padding-left: 12px;
}

.page-about .about-rail__yr,
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime-400);
}

.page-about .about-rail__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray-400);
}

@media (min-width: 1080px) {
  .page-about .about-frame {
    grid-template-columns: 88px minmax(0, 1fr) 112px;
    column-gap: clamp(24px, 3vw, 54px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 140px);
    overflow: hidden;
  }

  .page-about .about-rail--nums .about-rail__item {
    border-left: 0;
    border-right: 1px solid var(--coal-700);
    padding-left: 0;
    padding-right: 12px;
    text-align: right;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(36px, 5.2vw, 66px) 0 clamp(30px, 4vw, 52px);
  border-top: var(--about-hair);
}

.page-about .about-sec__num {
  margin: 0 0 clamp(12px, 1.6vw, 18px);
  color: var(--gray-400);
}

.page-about .about-h2 {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  font-size: clamp(26px, 3.8vw, 46px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.018em;
  max-width: 20em;
}

.page-about .about-text {
  max-width: 34em;
}

.page-about .about-text p {
  margin: 0 0 1.1em;
}

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

/* ---------- 刻度线 ---------- */
.page-about .about-ruler {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  margin: clamp(26px, 3.6vw, 44px) 0 clamp(10px, 1.6vw, 18px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-tl__node {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 0 0 12px 22px;
  border-left: 1px solid var(--coal-700);
}

.page-about .about-tl__dot {
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coal-700);
  border: 1px solid var(--coal-700);
}

.page-about .about-tl__node--now .about-tl__dot {
  background: var(--lime-400);
  box-shadow: 0 0 0 3px rgba(184, 255, 60, 0.18);
}

.page-about .about-tl__yr {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gray-400);
}

.page-about .about-tl__node--now .about-tl__yr {
  color: var(--lime-400);
}

.page-about .about-tl__cap {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--white-050);
}

.page-about .about-tl__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-400);
  max-width: 34em;
  transition: color 260ms var(--ease), opacity 260ms var(--ease);
}

@media (min-width: 760px) {
  .page-about .about-tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-tl__node {
    padding: 18px 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--coal-700);
  }

  .page-about .about-tl__dot {
    left: 0;
    top: -4px;
  }

  .page-about .about-tl__note {
    opacity: 0.55;
  }

  .page-about .about-tl__node:hover .about-tl__note {
    opacity: 1;
    color: var(--lime-200);
  }
}

/* ---------- 图片块 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--about-hair);
}

.page-about .about-figure .media__cap {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-400);
  max-width: 34em;
}

@media (min-width: 900px) {
  .page-about .about-figure--narrow {
    max-width: 560px;
    margin-left: auto;
  }
}

/* ---------- 三件事 ---------- */
.page-about .about-trio {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-trio__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-top: var(--about-hair);
}

.page-about .about-trio__item:last-child {
  border-bottom: var(--about-hair);
}

.page-about .about-trio__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange-500);
  padding-top: 4px;
}

.page-about .about-trio__name {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.2vw, 25px);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.page-about .about-trio__desc {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white-050);
  opacity: 0.82;
}

/* ---------- 团队折叠 ---------- */
.page-about .about-roles {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-roles__item {
  border-top: var(--about-hair);
}

.page-about .about-roles__item:last-child {
  border-bottom: var(--about-hair);
}

.page-about .about-roles__name {
  flex: 1 1 auto;
  text-align: left;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 500;
  letter-spacing: -0.005em;
}

.page-about .about-roles__list {
  margin: 0;
  padding: 0 0 4px 1.15em;
  max-width: 34em;
}

.page-about .about-roles__list li {
  margin: 0.55em 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--white-050);
  opacity: 0.84;
}

/* ---------- 数字条 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.4vw, 38px);
  background: var(--coal-700);
  border: var(--about-hair);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-900);
}

.page-about .about-fact__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray-400);
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作类型 ---------- */
.page-about .about-collab {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .about-collab__item {
  padding-left: 16px;
  border-left: 2px solid var(--coal-700);
  transition: border-color 240ms var(--ease);
}

.page-about .about-collab__item:hover {
  border-left-color: var(--lime-400);
}

.page-about .about-collab__chip {
  display: inline-block;
  margin-bottom: 8px;
}

.page-about .about-collab__item p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--white-050);
  opacity: 0.82;
}

@media (min-width: 780px) {
  .page-about .about-collab {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 52px);
  }
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-cta--inline {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-cta__note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gray-400);
  max-width: 30em;
}

/* ---------- 档案引注 ---------- */
.page-about .about-sec--last {
  background:
    linear-gradient(180deg, var(--about-soft) 0%, rgba(184, 255, 60, 0) 68%);
}

.page-about .about-quote {
  position: relative;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: clamp(18px, 2.6vw, 28px);
  max-width: 40em;
  font-family: var(--font-serif);
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--coal-950);
  background: var(--paper-100);
  border: 1px solid var(--paper-300);
  box-shadow: 6px 6px 0 0 rgba(217, 210, 194, 0.22);
}

.page-about .about-quote__label {
  display: inline-block;
  margin-right: 10px;
  vertical-align: 2px;
}

/* ---------- 焦点可达 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 2px;
}