.page-about {
  --about-rail: 112px;
  --about-deep-ink: #EFF4EE;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: clamp(40px, 7vw, 84px) 0 clamp(48px, 8vw, 100px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 91, 69, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 91, 69, .55) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -25%;
  width: 66%;
  height: 155%;
  background: linear-gradient(155deg, rgba(198, 255, 74, .16), rgba(63, 214, 138, .06) 58%, transparent 82%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero .crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(239, 244, 238, .6);
}

.page-about .about-hero .crumb a {
  color: rgba(239, 244, 238, .72);
  text-decoration: none;
}

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

.page-about .about-hero .eyebrow {
  margin-top: 22px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(36px, 6.2vw, 72px);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 54ch;
  margin-top: 20px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(239, 244, 238, .86);
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-figures {
  border: 1px solid rgba(30, 91, 69, .9);
  border-radius: var(--r-card);
  background: rgba(6, 42, 32, .78);
  padding: 22px 22px 14px;
}

.page-about .figures-cap {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mint);
}

.page-about .about-hero-figures ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero-figures li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px dashed rgba(30, 91, 69, .95);
}

.page-about .about-hero-figures li:last-child {
  border-bottom: 0;
}

.page-about .about-hero-figures .num {
  flex: none;
  min-width: 3.4em;
  font-family: var(--font-num);
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .fig-txt {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(239, 244, 238, .74);
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 64px;
    align-items: end;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  position: relative;
  z-index: 2;
  background: var(--mist);
  border-bottom: 1px solid rgba(30, 91, 69, .2);
}

.page-about .about-index-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 14px;
  padding-bottom: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .index-cap {
  flex: none;
  padding-right: 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--grey);
}

.page-about .about-index-inner a {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 15px;
  border: 1px solid rgba(30, 91, 69, .32);
  border-radius: 999px;
  font-size: 14px;
  color: var(--deep);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index-inner a .num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  color: var(--mint);
  transition: color var(--dur) var(--ease);
}

.page-about .about-index-inner a:hover,
.page-about .about-index-inner a:focus-visible {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--volt);
}

.page-about .about-index-inner a:hover .num,
.page-about .about-index-inner a:focus-visible .num {
  color: var(--volt);
}

/* ---------- 纵向章节流 ---------- */
.page-about .about-flow {
  background: var(--paper);
  padding: clamp(20px, 3vw, 36px) 0 clamp(32px, 5vw, 56px);
}

.page-about .about-flow-alt {
  background: var(--mist);
}

.page-about .chapter {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: clamp(30px, 5vw, 52px) 0;
  scroll-margin-top: 120px;
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .chapter-rail::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(30, 91, 69, .25);
}

.page-about .chapter-idx {
  display: block;
  font-family: var(--font-num);
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--deep);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-dot {
  display: none;
}

.page-about .chapter-body h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.14;
  color: var(--deep);
}

.page-about .chapter-body h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--deep);
}

.page-about .chapter-body p {
  max-width: 64ch;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .chapter-lead {
  font-size: 17px !important;
  color: var(--ink) !important;
  border-left: 3px solid var(--volt);
  padding-left: 16px;
}

.page-about .fact-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .fact-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .fact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 12px;
  height: 2px;
  background: var(--mint);
}

.page-about .chapter-media {
  margin: 28px 0 0;
  border: 1px solid rgba(30, 91, 69, .28);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--paper);
}

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

.page-about .chapter-media figcaption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
  border-top: 1px solid rgba(30, 91, 69, .18);
}

@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    padding: clamp(44px, 4.5vw, 68px) 0;
  }

  .page-about .chapter::before {
    content: "";
    position: absolute;
    left: calc(var(--about-rail) / 2);
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(30, 91, 69, .55), rgba(30, 91, 69, .1));
  }

  .page-about .chapter-rail {
    display: block;
    text-align: center;
    padding-top: 6px;
  }

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

  .page-about .chapter-idx {
    font-size: clamp(44px, 4.6vw, 58px);
  }

  .page-about .chapter-dot {
    display: block;
    position: absolute;
    z-index: 2;
    left: calc(var(--about-rail) / 2);
    top: 76px;
    width: 11px;
    height: 11px;
    margin-left: -5.5px;
    border-radius: 50%;
    background: var(--volt);
    box-shadow: 0 0 0 4px rgba(198, 255, 74, .18);
  }
}

/* ---------- 使用场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .scene-item {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: var(--mist);
  border-left: 4px solid var(--mint);
  border-radius: 0 var(--r-card);
}

.page-about .about-flow-alt .scene-item {
  background: var(--paper);
  border-left-color: var(--orange);
}

.page-about .scene-idx {
  display: block;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--grey);
}

.page-about .scene-item h3 {
  margin-top: 6px;
}

.page-about .scene-item p {
  margin-top: 8px;
  font-size: 15px;
}

@media (min-width: 768px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 深色引言带 ---------- */
.page-about .about-quote {
  position: relative;
  overflow: hidden;
  background: var(--deep-2);
  color: var(--paper);
  padding: clamp(44px, 7.5vw, 88px) 0;
}

.page-about .about-quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--volt), var(--mint));
}

.page-about .about-quote::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -60%;
  width: 46%;
  aspect-ratio: 1 / 1;
  border: 1px solid rgba(198, 255, 74, .22);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-quote-inner {
  position: relative;
  z-index: 1;
}

.page-about .quote-text {
  max-width: 24ch;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(25px, 4.4vw, 50px);
  line-height: 1.16;
  color: var(--paper);
}

.page-about .quote-note {
  margin-top: 18px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--volt);
}

/* ---------- 整理流程 ---------- */
.page-about .step-list {
  list-style: none;
  counter-reset: step;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .step-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid rgba(30, 91, 69, .2);
}

.page-about .step-list li:last-child {
  border-bottom: 1px solid rgba(30, 91, 69, .2);
}

.page-about .step-num {
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .step-list p {
  margin-top: 6px;
  font-size: 15px;
}

/* ---------- 团队构成 ---------- */
.page-about .team-split {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .team-cell {
  padding: 24px 22px;
  border-radius: var(--r-card);
  background: var(--paper);
  border: 1px solid rgba(30, 91, 69, .22);
}

.page-about .team-cell-mint {
  box-shadow: inset 4px 0 0 var(--mint);
}

.page-about .team-cell-volt {
  box-shadow: inset 4px 0 0 var(--volt);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(44px, 5.5vw, 62px);
  font-weight: 800;
  line-height: 1;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}

.page-about .team-cell h3 {
  margin-top: 10px;
  font-size: 20px;
}

.page-about .team-cell p {
  margin-top: 8px;
  font-size: 15px;
}

@media (min-width: 768px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 18px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--deep);
  color: var(--paper);
  padding: clamp(46px, 7.5vw, 92px) 0;
}

.page-about .eco-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.14;
  color: var(--paper);
}

.page-about .eco-note {
  max-width: 56ch;
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(239, 244, 238, .76);
}

@media (min-width: 900px) {
  .page-about .eco-head {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .eco-note {
    margin-top: 0;
  }
}

.page-about .eco-visual {
  display: grid;
  gap: 28px;
  margin-top: 34px;
}

.page-about .eco-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
  max-width: 300px;
}

.page-about .eco-dots span {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--mint);
  background: rgba(63, 214, 138, .14);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .eco-dots span:hover {
  background: var(--volt);
  border-color: var(--volt);
  transform: scale(1.3);
}

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

.page-about .eco-card {
  padding: 20px;
  border: 1px solid rgba(30, 91, 69, .95);
  border-radius: var(--r-card);
  background: rgba(6, 42, 32, .7);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .eco-card:hover {
  transform: translateY(-3px);
  border-color: var(--volt);
}

.page-about .eco-idx {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--volt);
}

.page-about .eco-card h3 {
  margin-top: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .eco-card p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(239, 244, 238, .74);
}

@media (min-width: 768px) {
  .page-about .eco-visual {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .eco-award {
  margin-top: 34px;
  padding: 18px 22px;
  border-left: 4px solid var(--volt);
  background: rgba(6, 42, 32, .7);
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(239, 244, 238, .88);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--deep-2);
  color: var(--paper);
  padding: clamp(50px, 8vw, 100px) 0;
}

.page-about .tl-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .tl-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(180deg, rgba(6, 42, 32, .82), rgba(11, 58, 43, .94));
}

.page-about .tl-inner {
  position: relative;
  z-index: 1;
}

.page-about .tl-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.14;
  color: var(--paper);
}

.page-about .tl-head .sec-note {
  max-width: 46ch;
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(239, 244, 238, .72);
}

@media (min-width: 900px) {
  .page-about .tl-head {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .tl-head .sec-note {
    margin-top: 0;
  }
}

.page-about .tl-track {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .tl-step {
  position: relative;
  padding: 26px 0 22px 22px;
  border-left: 1px solid rgba(198, 255, 74, .28);
}

.page-about .tl-step::after {
  content: "";
  position: absolute;
  left: -5.5px;
  top: 30px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--volt);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, .14);
}

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

.page-about .tl-year {
  display: block;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-step h3 {
  margin-top: 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .tl-step p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(239, 244, 238, .76);
}

@media (min-width: 860px) {
  .page-about .tl-track {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0 18px;
    margin-top: 52px;
  }

  .page-about .tl-step {
    padding: 28px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(198, 255, 74, .3);
  }

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

  .page-about .tl-step::after {
    left: 0;
    top: -5.5px;
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  background: var(--volt);
  color: var(--deep);
  padding: clamp(40px, 6.5vw, 72px) 0;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.16;
  color: var(--deep);
}

.page-about .about-cta p {
  max-width: 56ch;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--deep-2);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta .btn-outline {
  border-color: var(--deep);
  color: var(--deep);
  background: transparent;
}

.page-about .about-cta .btn-outline:hover,
.page-about .about-cta .btn-outline:focus-visible {
  background: var(--deep);
  color: var(--volt);
}

@media (min-width: 900px) {
  .page-about .about-cta-inner {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .cta-actions {
    margin-top: 0;
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-card,
  .page-about .eco-dots span,
  .page-about .about-index-inner a {
    transition: none;
  }

  .page-about .eco-card:hover {
    transform: none;
  }
}