.page-about{
  --about-rail: 176px;
  position: relative;
  display: block;
  color: var(--paper);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(180deg, rgba(17, 34, 64, 0.85) 0%, rgba(10, 22, 40, 0) 420px),
    repeating-linear-gradient(0deg, rgba(136, 146, 168, 0.045) 0 1px, transparent 1px 88px);
  padding-bottom: clamp(56px, 9vw, 128px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding-top: clamp(18px, 3vw, 40px);
}

.page-about .about-hero__grid{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(26px, 5vw, 54px);
}

.page-about .about-hero__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 14px 0 0;
  position: relative;
  padding-bottom: 20px;
}

.page-about .about-hero__title::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(64px, 16vw, 132px);
  height: 3px;
  background: linear-gradient(90deg, var(--signal), rgba(255, 107, 53, 0));
}

.page-about .about-hero .lede{
  margin-top: 22px;
  max-width: 58ch;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__facts{
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  background: linear-gradient(150deg, rgba(17, 34, 64, 0.92), rgba(12, 27, 49, 0.86));
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__facts-title{
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .about-hero__factlist{
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-fact__num{
  display: block;
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-fact__label{
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index{
  margin-top: clamp(34px, 5vw, 60px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.page-about .about-index__label{
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .about-index__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about .about-index__list a{
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__list a .mono{
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible{
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-index__list a:hover .mono{
  color: var(--signal);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 30px);
  padding: clamp(38px, 6vw, 78px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .chapter:first-of-type{
  border-top: 0;
}

.page-about .chapter__rail{
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .chapter__num{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(50px, 9vw, 100px);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--gold);
  text-decoration: none;
  display: inline-block;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .chapter__num:hover{
  color: var(--signal);
  transform: translateX(3px);
}

.page-about .chapter__side{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--muted);
  display: none;
}

.page-about .chapter__body{
  min-width: 0;
}

.page-about .chapter__title{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 20px;
}

.page-about .chapter__body p{
  max-width: 70ch;
  margin: 0 0 1.15em;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.9;
}

.page-about .chapter__link{
  margin-top: 30px;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline{
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  max-width: 70ch;
}

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

.page-about .timeline__item:last-child{
  border-left-color: transparent;
  padding-bottom: 4px;
}

.page-about .timeline__item::before{
  content: "";
  position: absolute;
  left: -4.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--signal);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .timeline__item:hover::before{
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(240, 180, 41, 0.16);
}

.page-about .timeline__meta{
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .timeline__title{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  color: var(--paper);
  margin: 8px 0 8px;
}

.page-about .timeline__text{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .duty-grid{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .duty{
  background: var(--ink-750);
  padding: 20px clamp(16px, 2.4vw, 26px);
  transition: background 0.2s var(--ease);
}

.page-about .duty:hover{
  background: var(--ink-800);
}

.page-about .duty__label{
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .duty__text{
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 服务能力 ---------- */
.page-about .capability-list{
  margin-top: 26px;
}

.page-about .capability{
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(135deg, rgba(17, 34, 64, 0.94), rgba(12, 27, 49, 0.9));
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  transition: border-left-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .capability:hover{
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .capability__num{
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .capability__title{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.3;
  color: var(--paper);
  margin: 0;
}

.page-about .capability__text{
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 联系方式条 ---------- */
.page-about .contact-strip{
  margin-top: 26px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  background: rgba(12, 27, 49, 0.72);
}

.page-about .contact-strip__row{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 14px clamp(16px, 2.4vw, 24px);
  border-bottom: 1px solid var(--line);
}

.page-about .contact-strip__row:last-child{
  border-bottom: 0;
}

.page-about .contact-strip__label{
  flex: 0 0 84px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .contact-strip__value{
  flex: 1 1 220px;
  min-width: 0;
  font-size: 15px;
  word-break: break-word;
  color: var(--paper);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta{
  margin-top: clamp(36px, 6vw, 76px);
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid var(--line-strong);
  border-top: 2px solid var(--gold);
  background: linear-gradient(160deg, rgba(17, 34, 64, 0.95), rgba(10, 22, 40, 0.98));
  display: grid;
  gap: 16px;
}

.page-about .about-cta .eyebrow{
  margin: 0;
}

.page-about .about-cta__title{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.28;
  color: var(--paper);
  margin: 0;
}

.page-about .about-cta__text{
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ---------- 图片容器微调 ---------- */
.page-about .about-figure{
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-figure .media__caption{
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 返回顶部 ---------- */
.page-about .to-top{
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 20;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--paper);
  background: rgba(17, 34, 64, 0.94);
  border: 1px solid var(--line-signal);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .to-top[data-visible]{
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.page-about .to-top:hover{
  border-color: var(--signal);
  color: var(--signal);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px){
  .page-about .duty-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px){
  .page-about .chapter{
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .chapter__rail{
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
  }

  .page-about .chapter__side{
    display: block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    border-left: 1px solid var(--line-signal);
    padding-left: 9px;
    max-height: 190px;
  }
}

@media (min-width: 980px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.85fr);
    align-items: start;
  }
}

@media (max-width: 560px){
  .page-about .about-hero__factlist{
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-index__list{
    flex-direction: column;
    gap: 8px;
  }
}
<<<END>>>