.page-about {
  --ab-line: rgba(138, 150, 142, 0.16);
  --ab-line-soft: rgba(138, 150, 142, 0.09);
  --ab-panel: rgba(16, 49, 42, 0.52);
  --ab-panel-strong: rgba(28, 63, 52, 0.58);
  background:
    radial-gradient(1100px 560px at 10% -10%, rgba(53, 224, 200, 0.075), transparent 62%),
    linear-gradient(180deg, var(--bs-deep) 0%, #081b16 58%, var(--bs-char) 100%);
  color: var(--bs-cream);
  font-family: var(--bs-body);
  overflow-x: clip;
}

.page-about .about-crumb-wrap {
  padding-top: clamp(22px, 4vw, 44px);
  padding-bottom: clamp(6px, 2vw, 14px);
}

.page-about .about-crumb__now {
  color: var(--bs-cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 60px) 0 clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--bs-hair);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(90deg, var(--bs-grid-line) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, var(--bs-grid-line) 0 1px, transparent 1px 96px);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__eyebrow {
  color: var(--bs-cyan);
  margin: 0;
}

.page-about .about-hero__title {
  max-width: 22ch;
  margin: 0;
  color: var(--bs-cream);
}

.page-about .about-hero__cols {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(237, 231, 218, 0.82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair-soft);
}

.page-about .about-fact {
  padding: 14px 16px 16px;
  background: rgba(10, 31, 26, 0.72);
}

.page-about .about-fact dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--bs-rock);
}

.page-about .about-fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--bs-cream);
}

.page-about .about-fact dd .bs-num {
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
}

.page-about .about-fact dd em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--bs-rock);
}

/* ---------- 主体：索引 + 内容流 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  padding-top: clamp(44px, 7vw, 92px);
  padding-bottom: clamp(56px, 9vw, 110px);
}

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

.page-about .about-rail__label {
  margin: 0 0 14px;
  color: var(--bs-rock);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--bs-hair);
}

.page-about .about-rail__list li a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 10px 8px 10px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--bs-rock);
  font-size: 13px;
  line-height: 1.55;
  text-decoration: none;
  transition: color var(--bs-fast) var(--bs-ease),
              border-color var(--bs-fast) var(--bs-ease),
              background-color var(--bs-fast) var(--bs-ease);
}

.page-about .about-rail__list li a .bs-num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--bs-rock);
  transition: color var(--bs-fast) var(--bs-ease);
}

.page-about .about-rail__list li a:hover,
.page-about .about-rail__list li a:focus-visible {
  color: var(--bs-cream);
  border-left-color: var(--bs-cyan);
  background: rgba(53, 224, 200, 0.06);
  outline: none;
}

.page-about .about-rail__list li a:hover .bs-num,
.page-about .about-rail__list li a:focus-visible .bs-num {
  color: var(--bs-cyan);
}

.page-about .about-flow {
  display: grid;
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding-bottom: clamp(42px, 6vw, 80px);
  margin-bottom: clamp(42px, 6vw, 80px);
  border-bottom: 1px solid var(--bs-hair-soft);
}

.page-about .about-sec:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding-top: 6px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-sec__no {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--bs-cyan);
}

.page-about .about-sec__title {
  margin: 0;
  color: var(--bs-cream);
}

.page-about .about-sec__body {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-sec__body--narrow {
  max-width: 62ch;
}

.page-about .about-sec__lead {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--bs-cream);
}

.page-about .about-sec__body p:not(.about-sec__lead) {
  margin: 0 0 12px;
  color: rgba(237, 231, 218, 0.76);
  line-height: 1.8;
}

.page-about .about-sec__more {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--bs-cyan);
  font-size: 14px;
  line-height: 1.75;
  color: var(--bs-rock);
}

.page-about a {
  color: var(--bs-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, 0.34);
  transition: border-color var(--bs-fast) var(--bs-ease), color var(--bs-fast) var(--bs-ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--bs-cream);
  border-bottom-color: var(--bs-cyan);
  outline: none;
}

/* ---------- 01 里程碑小列表 ---------- */

.page-about .about-miles {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--bs-hair-soft);
  border-top: 1px solid var(--bs-hair-soft);
  border-bottom: 1px solid var(--bs-hair-soft);
}

.page-about .about-mile {
  display: grid;
  gap: 8px;
  padding: 16px clamp(16px, 2.4vw, 24px);
  background: rgba(10, 31, 26, 0.62);
}

.page-about .about-mile__k {
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bs-cyan);
}

.page-about .about-mile p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(237, 231, 218, 0.8);
}

/* ---------- 02 覆盖图 ---------- */

.page-about .about-cover__fig {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-cover__legend {
  display: grid;
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair-soft);
}

.page-about .about-legend {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--ab-panel);
}

.page-about .about-legend__k {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--bs-rock);
}

.page-about .about-legend__n {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 10px;
  color: var(--bs-cream);
}

.page-about .about-legend__n .bs-num {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
}

.page-about .about-legend__n em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bs-rock);
}

.page-about .about-legend__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(237, 231, 218, 0.74);
}

/* ---------- 03 团队 ---------- */

.page-about .about-team__bar {
  display: flex;
  height: 40px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 1px solid var(--bs-hair);
  background: rgba(10, 31, 26, 0.6);
  overflow: hidden;
}

.page-about .about-team__seg {
  display: block;
  height: 100%;
  transition: filter var(--bs-fast) var(--bs-ease);
}

.page-about .about-team__seg--a { flex: 22 1 0; background: linear-gradient(180deg, var(--bs-cyan), var(--bs-cyan-deep)); }
.page-about .about-team__seg--b { flex: 14 1 0; background: linear-gradient(180deg, var(--bs-cyan-deep), #0b7a6c); }
.page-about .about-team__seg--c { flex: 10 1 0; background: linear-gradient(180deg, var(--bs-clay), #8a4f34); }

.page-about .about-team__roles {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair-soft);
}

.page-about .about-role {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ab-panel);
}

.page-about .about-role__n {
  display: block;
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--bs-cream);
}

.page-about .about-role__t {
  margin: 0 0 8px;
  color: var(--bs-cream);
}

.page-about .about-role__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 231, 218, 0.74);
}

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

/* ---------- 04 流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair-soft);
}

.page-about .about-step {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 28px) clamp(56px, 7vw, 88px);
  background: var(--ab-panel);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: clamp(26px, 3.4vw, 43px);
  top: clamp(18px, 2.6vw, 28px);
  bottom: clamp(18px, 2.6vw, 28px);
  width: 1px;
  background: linear-gradient(180deg, var(--bs-cyan), transparent);
  opacity: 0.35;
}

.page-about .about-step__n {
  position: absolute;
  left: clamp(16px, 2.2vw, 26px);
  top: clamp(20px, 2.8vw, 30px);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--bs-cyan);
}

.page-about .about-step__t {
  margin: 0 0 8px;
  color: var(--bs-cream);
}

.page-about .about-step__d {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 231, 218, 0.76);
}

.page-about .about-step__m {
  margin: 0;
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bs-rock);
}

.page-about .about-pulse {
  display: grid;
  gap: 12px;
  align-items: center;
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 32px);
  border-left: 3px solid var(--bs-cyan);
  background: linear-gradient(90deg, rgba(53, 224, 200, 0.09), rgba(53, 224, 200, 0.01) 70%);
}

.page-about .about-pulse__n {
  margin: 0;
  font-size: clamp(46px, 8vw, 76px);
  line-height: 0.9;
  color: var(--bs-cream);
}

.page-about .about-pulse__u {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--bs-cyan);
}

.page-about .about-pulse__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 231, 218, 0.76);
}

/* ---------- 05 轮换与窗口 ---------- */

.page-about .about-rot {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-rot__main p {
  margin: 0 0 12px;
  line-height: 1.8;
  color: rgba(237, 231, 218, 0.78);
}

.page-about .about-rot__main p.about-sec__lead {
  color: var(--bs-cream);
}

.page-about .about-rot__card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--bs-hair);
  background:
    repeating-linear-gradient(0deg, var(--bs-grid-line) 0 1px, transparent 1px 28px),
    var(--ab-panel-strong);
}

.page-about .about-rot__card .bs-anno {
  margin: 0 0 10px;
  color: var(--bs-rock);
}

.page-about .about-rot__win {
  margin: 0;
  font-size: clamp(58px, 10vw, 96px);
  line-height: 0.85;
  color: var(--bs-cyan);
}

.page-about .about-rot__unit {
  margin: 8px 0 16px;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--bs-cream);
}

.page-about .about-rot__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--bs-hair);
  font-size: 13px;
  line-height: 1.72;
  color: rgba(237, 231, 218, 0.7);
}

/* ---------- 06 历程 ---------- */

.page-about .about-hist__fig {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-hist {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: hist;
}

.page-about .about-hist__item:nth-child(even) .about-hist__d {
  padding-left: clamp(0px, 3vw, 34px);
}

.page-about .about-hist__d {
  border-bottom: 1px solid var(--bs-hair-soft);
}

.page-about .about-hist__s {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-hist__s::-webkit-details-marker,
.page-about .about-hist__s::marker {
  display: none;
  content: "";
}

.page-about .about-hist__no {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--bs-cyan);
}

.page-about .about-hist__name {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bs-cream);
}

.page-about .about-hist__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bs-rock);
}

.page-about .about-hist__tag span {
  display: inline-block;
  font-size: 15px;
  line-height: 1;
  color: var(--bs-cyan);
  transition: transform var(--bs-mid) var(--bs-ease);
}

.page-about .about-hist__d[open] .about-hist__tag span {
  transform: rotate(45deg);
}

.page-about .about-hist__s:hover .about-hist__name,
.page-about .about-hist__s:focus-visible .about-hist__name {
  color: var(--bs-cyan);
}

.page-about .about-hist__s:focus-visible {
  outline: 1px solid var(--bs-cyan);
  outline-offset: 4px;
}

.page-about .about-hist__body {
  padding: 0 0 20px 46px;
}

.page-about .about-hist__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 231, 218, 0.76);
}

/* ---------- 07 合作 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair-soft);
}

.page-about .about-partner {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ab-panel);
}

.page-about .about-partner__n {
  display: block;
  margin: 0 0 10px;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  color: var(--bs-cream);
}

.page-about .about-partner__k {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--bs-cyan);
}

.page-about .about-partner__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 231, 218, 0.74);
}

/* ---------- 收尾 ---------- */

.page-about .about-close {
  padding: clamp(48px, 8vw, 100px) 0 clamp(56px, 9vw, 116px);
  border-top: 1px solid var(--bs-hair);
  background:
    radial-gradient(900px 420px at 78% 110%, rgba(53, 224, 200, 0.09), transparent 66%);
}

.page-about .about-close__inner {
  display: grid;
  gap: 16px;
  max-width: 780px;
}

.page-about .about-close__inner .bs-anno {
  margin: 0;
  color: var(--bs-cyan);
}

.page-about .about-close__title {
  margin: 0;
  max-width: 24ch;
  color: var(--bs-cream);
}

.page-about .about-close__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(237, 231, 218, 0.78);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-pulse {
    grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 36px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 64px);
  }

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(44px, 5vw, 84px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 132px;
    align-self: start;
  }

  .page-about .about-flow {
    border-left: 1px solid var(--bs-hair-soft);
    padding-left: clamp(28px, 4vw, 56px);
  }

  .page-about .about-rot {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .about-sec {
    display: block;
  }

  .page-about .about-sec__body--narrow {
    margin-left: 0;
  }

  .page-about .about-hist__item:nth-child(even) .about-hist__d {
    margin-left: clamp(24px, 5vw, 72px);
  }

  .page-about .about-hist__item:nth-child(odd) .about-hist__d {
    margin-right: clamp(24px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list li a,
  .page-about .about-hist__tag span {
    transition: none;
  }
}
</>