.page-about {
  --about-gap: clamp(54px, 8vw, 104px);
}

.page-about .about-crumb {
  padding-top: 26px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--paper-dim);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 14px 0 var(--about-gap);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -190px;
  right: -28%;
  width: 82%;
  height: 480px;
  background: linear-gradient(150deg, rgba(18, 41, 74, .95), rgba(6, 16, 31, 0) 72%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(46, 76, 112, .2) 1px, transparent 1px);
  background-size: 100% 58px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.6vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -.03em;
  color: var(--paper);
  text-shadow: 0 0 1px rgba(53, 230, 212, .5);
}

.page-about .about-hero__text .lede {
  max-width: 46ch;
  color: var(--paper-dim);
  font-size: .96rem;
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 34px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stats .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat-label {
  display: block;
  margin-top: 8px;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure .media-frame {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-panel), inset 0 0 0 1px rgba(53, 230, 212, .12);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: .76rem;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */

.page-about .block {
  margin-bottom: var(--about-gap);
}

.page-about .about-section-head {
  max-width: 56ch;
}

.page-about .about-section-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4.4vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-section-head .lede {
  margin-top: 16px;
  color: var(--paper-dim);
  font-size: .93rem;
  line-height: 1.85;
}

/* ---------- 品牌坐标 ---------- */

.page-about .coord-list {
  display: grid;
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .coord-item {
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, rgba(11, 28, 54, .96), rgba(8, 21, 42, .98));
  transition: background .3s var(--ease);
}

.page-about .coord-item:hover {
  background: linear-gradient(180deg, rgba(18, 41, 74, .98), rgba(11, 28, 54, .98));
}

.page-about .coord-no {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .coord-item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.04rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .coord-item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--paper-dim);
}

/* ---------- 价值主张 ---------- */

.page-about .value-grid {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .value-card {
  position: relative;
  padding: 28px 24px 30px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 41, 74, .82), rgba(8, 21, 42, .94));
  box-shadow: var(--shadow-panel);
}

.page-about .value-card::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  width: 46px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--cyan);
}

.page-about .value-card:nth-child(2)::before {
  background: var(--amber);
}

.page-about .value-card:nth-child(3)::before {
  background: var(--violet);
}

.page-about .value-tag {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .value-card h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .value-card p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 服务对象 ---------- */

.page-about .persona-list {
  display: grid;
  gap: 4px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .persona {
  padding: 20px 0 20px 20px;
  border-left: 1px solid var(--line-soft);
}

.page-about .persona__who {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .persona__who span {
  display: block;
  margin-top: 7px;
  font-family: var(--font-body);
  font-size: .7rem;
  font-weight: 400;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .persona p {
  margin: 12px 0 0;
  font-size: .9rem;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 运营历程 ---------- */

.page-about .timeline {
  position: relative;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 230, 212, .7), rgba(46, 76, 112, .55) 60%, transparent);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 34px 36px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 14px rgba(53, 230, 212, .45);
}

.page-about .timeline-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .timeline-stage {
  margin: 10px 0 6px;
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .timeline-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .timeline-item p {
  margin: 0;
  max-width: 52ch;
  font-size: .89rem;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 团队与协作 ---------- */

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

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media-frame {
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.page-about .eco-wrap {
  padding: 24px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: radial-gradient(circle at 50% 42%, rgba(18, 41, 74, .88), rgba(6, 16, 31, .6) 72%);
}

.page-about .eco-diagram {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
}

.page-about .eco-legend {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .85rem;
  color: var(--paper-dim);
  transition: color .25s var(--ease);
}

.page-about .eco-legend li:hover {
  color: var(--paper);
}

.page-about .eco-legend i {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.page-about .eco-legend li:nth-child(1) i { background: var(--cyan); }
.page-about .eco-legend li:nth-child(2) i { background: var(--amber); }
.page-about .eco-legend li:nth-child(3) i { background: var(--violet); }
.page-about .eco-legend li:nth-child(4) i { background: var(--coral); }
.page-about .eco-legend li:nth-child(5) i { background: var(--paper); }

/* ---------- 会员权益 ---------- */

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

.page-about .tier-figure {
  margin: 0;
}

.page-about .tier-figure .media-frame {
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  box-shadow: var(--shadow-panel);
}

.page-about .tier {
  margin-bottom: 10px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(11, 28, 54, .62);
  overflow: hidden;
  transition: border-color .3s var(--ease);
}

.page-about .tier[open] {
  border-color: rgba(53, 230, 212, .42);
}

.page-about .tier summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  font-size: .91rem;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

.page-about .tier summary::-webkit-details-marker {
  display: none;
}

.page-about .tier summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .tier[open] summary::after {
  content: "–";
  color: var(--cyan);
}

.page-about .tier summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .tier p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: .86rem;
  line-height: 1.82;
  color: var(--paper-dim);
}

.page-about .watch-strip {
  display: grid;
  gap: 18px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.page-about .watch-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-about .watch-item p {
  margin: 8px 0 0;
  font-size: .84rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 结尾通道 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin: 0 0 clamp(60px, 9vw, 96px);
  padding: 30px 26px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(118deg, rgba(18, 41, 74, .92), rgba(6, 16, 31, .55));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.18rem;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 10px 0 0;
  max-width: 48ch;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

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

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 34px 32px;
  }

  .page-about .watch-strip {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 820px) {
  .page-about .coord-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .persona-list {
    gap: 6px;
  }

  .page-about .persona {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
    padding: 22px 0 22px 24px;
  }

  .page-about .persona p {
    margin-top: 0;
  }

  .page-about .timeline-item {
    padding-left: 48px;
  }

  .page-about .timeline-num {
    font-size: 2.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 46px;
  }

  .page-about .value-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .page-about .value-card:nth-child(2) {
    transform: translateY(-20px);
  }

  .page-about .value-card:nth-child(3) {
    transform: translateY(12px);
  }

  .page-about .team-grid,
  .page-about .tier-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 36px;
  }

  .page-about .tier-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .value-card,
  .page-about .coord-item,
  .page-about .eco-legend li {
    transition: none;
  }

  .page-about .value-card:nth-child(2),
  .page-about .value-card:nth-child(3) {
    transform: none;
  }
}