.page-about {
  --about-rail: 232px;
  --about-gap: 64px;
  --about-bar-h: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 52px;
  border-bottom: 1px solid rgba(42, 52, 104, 0.55);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(680px 320px at 84% -12%, rgba(79, 227, 208, 0.16), transparent 70%),
    radial-gradient(520px 300px at 4% 112%, rgba(255, 122, 92, 0.1), transparent 72%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: repeating-linear-gradient(12deg, rgba(42, 52, 104, 0.4) 0 1px, transparent 1px 68px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(1.9rem, 6.4vw, 4.1rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ry-text);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 18px 0 0;
  color: var(--ry-muted);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(42, 52, 104, 0.75);
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--ry-font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ry-cyan);
}

.page-about .hero-stat__label {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--ry-muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-top: 44px;
  padding-bottom: 64px;
}

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

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--ry-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ry-muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid rgba(42, 52, 104, 0.85);
}

.page-about .about-rail .toc__link {
  display: block;
  margin-left: -1px;
  padding: 9px 0 9px 16px;
  border-left: 2px solid transparent;
  color: var(--ry-muted);
  font-size: 0.85rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s var(--ry-ease), border-color 0.2s var(--ry-ease);
}

.page-about .about-rail .toc__link:hover,
.page-about .about-rail .toc__link:focus-visible,
.page-about .about-rail .toc__link[aria-current="true"] {
  color: var(--ry-cyan);
  border-left-color: var(--ry-cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section + .about-section {
  margin-top: 68px;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--ry-header-h) + 24px);
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-size: clamp(1.45rem, 3.6vw, 2.2rem);
  font-weight: 800;
  line-height: 1.26;
  color: var(--ry-text);
}

.page-about .about-section__intro {
  max-width: 60ch;
  margin: 14px 0 0;
  color: var(--ry-muted);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .about-media {
  margin: 28px 0 0;
  border: 1px solid rgba(42, 52, 104, 0.9);
  border-radius: var(--ry-radius);
  overflow: hidden;
  background: var(--ry-panel);
}

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

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(79, 227, 208, 0.8), rgba(42, 52, 104, 0.9));
}

.page-about .tl__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 28px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ry-deep);
  border: 1px solid var(--ry-gold);
  box-shadow: 0 0 0 4px rgba(242, 196, 107, 0.08), 0 0 12px rgba(242, 196, 107, 0.45);
}

.page-about .tl__year-num {
  font-family: var(--ry-font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ry-gold);
}

.page-about .tl__body {
  margin-top: 8px;
}

.page-about .tl__panel {
  position: relative;
  width: 100%;
  padding: 20px;
  border: 1px solid rgba(42, 52, 104, 0.95);
  border-radius: var(--ry-radius);
  background: linear-gradient(180deg, rgba(22, 28, 58, 0.96), rgba(22, 28, 58, 0.72));
  overflow: hidden;
  transition: border-color 0.24s var(--ry-ease);
}

.page-about .tl__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(79, 227, 208, 0.9), rgba(79, 227, 208, 0));
}

.page-about .tl__panel:hover {
  border-color: rgba(79, 227, 208, 0.45);
}

.page-about .tl__stage {
  margin: 0;
  font-family: var(--ry-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ry-cyan);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ry-text);
}

.page-about .tl__text {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--ry-muted);
}

.page-about .tl__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(42, 52, 104, 0.95);
}

.page-about .tl__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--ry-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ry-cyan);
}

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

.page-about .tl__more summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: 1px solid rgba(79, 227, 208, 0.55);
  border-radius: 50%;
  font-size: 0.72rem;
  line-height: 1;
}

.page-about .tl__more[open] summary::before {
  content: "−";
}

.page-about .tl__more-body p {
  margin: 10px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ry-muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 28px;
}

.page-about .team-bars {
  display: grid;
  gap: 22px;
}

.page-about .bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .bar__name {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--ry-text);
}

.page-about .bar__count {
  font-family: var(--ry-font-mono);
  font-size: 0.88rem;
  color: var(--ry-cyan);
}

.page-about .bar__track {
  margin-top: 9px;
  height: var(--about-bar-h);
  border-radius: 999px;
  background: rgba(42, 52, 104, 0.55);
  overflow: hidden;
}

.page-about .bar__fill {
  display: block;
  width: var(--bar-w, 0%);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ry-cyan), rgba(79, 227, 208, 0.35));
  box-shadow: 0 0 14px rgba(79, 227, 208, 0.35);
  transform-origin: left center;
  animation: about-bar-grow 0.9s var(--ry-ease) both;
}

.page-about .bar__fill--gold {
  background: linear-gradient(90deg, var(--ry-gold), rgba(242, 196, 107, 0.3));
  box-shadow: 0 0 14px rgba(242, 196, 107, 0.3);
  animation-delay: 0.12s;
}

.page-about .bar__fill--coral {
  background: linear-gradient(90deg, var(--ry-coral), rgba(255, 122, 92, 0.3));
  box-shadow: 0 0 14px rgba(255, 122, 92, 0.3);
  animation-delay: 0.24s;
}

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .bar__note {
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--ry-muted);
}

.page-about .about-media--square {
  margin-top: 0;
}

/* ---------- 梳理流程 ---------- */
.page-about .cycle-visual {
  position: relative;
}

.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  position: relative;
  padding: 18px 18px 18px 22px;
  border: 1px solid rgba(42, 52, 104, 0.85);
  border-radius: var(--ry-radius-sm);
  background: rgba(22, 28, 58, 0.75);
}

.page-about .step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--ry-coral), rgba(255, 122, 92, 0.15));
}

.page-about .step__num {
  margin: 0;
  font-family: var(--ry-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ry-coral);
}

.page-about .step__title {
  margin: 7px 0 0;
  font-size: 0.97rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ry-text);
}

.page-about .step__text {
  margin: 8px 0 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--ry-muted);
}

/* ---------- 栏目共建 ---------- */
.page-about .partner-panel {
  margin-top: 28px;
  padding: 24px;
  border: 1px solid rgba(42, 52, 104, 0.9);
  border-radius: var(--ry-radius);
  background:
    radial-gradient(420px 200px at 100% 0%, rgba(79, 227, 208, 0.12), transparent 70%),
    rgba(22, 28, 58, 0.78);
}

.page-about .partner-panel__lead {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--ry-text);
}

.page-about .partner-points {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-point {
  padding-top: 14px;
  border-top: 1px solid rgba(42, 52, 104, 0.8);
}

.page-about .partner-point__key {
  display: block;
  font-family: var(--ry-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--ry-cyan);
}

.page-about .partner-point__text {
  display: block;
  margin-top: 7px;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--ry-muted);
}

/* ---------- 里程碑 ---------- */
.page-about .miles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .mile {
  position: relative;
  overflow: hidden;
  padding: 20px 20px 20px 22px;
  border: 1px solid rgba(42, 52, 104, 0.9);
  border-radius: var(--ry-radius-sm);
  background: linear-gradient(135deg, rgba(22, 28, 58, 0.96), rgba(11, 16, 38, 0.9));
}

.page-about .mile::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--ry-coral), rgba(255, 122, 92, 0.18));
}

.page-about .mile::after {
  content: "";
  position: absolute;
  right: -22px;
  top: -22px;
  width: 52px;
  height: 52px;
  transform: rotate(45deg);
  background: rgba(242, 196, 107, 0.1);
}

.page-about .mile__year {
  margin: 0;
  font-family: var(--ry-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--ry-gold);
}

.page-about .mile__title {
  margin: 7px 0 0;
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--ry-text);
}

.page-about .mile__text {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--ry-muted);
}

/* ---------- 服务对象 ---------- */
.page-about .who {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .who__item {
  padding: 18px;
  border: 1px solid rgba(42, 52, 104, 0.85);
  border-radius: var(--ry-radius-sm);
  background: rgba(22, 28, 58, 0.62);
  transition: border-color 0.24s var(--ry-ease), background 0.24s var(--ry-ease);
}

.page-about .who__item:hover {
  border-color: rgba(79, 227, 208, 0.4);
  background: rgba(22, 28, 58, 0.88);
}

.page-about .who__tag {
  margin: 0;
  font-family: var(--ry-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ry-muted);
}

.page-about .who__name {
  margin: 8px 0 0;
  font-size: 0.97rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ry-text);
}

.page-about .who__text {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--ry-muted);
}

/* ---------- 页尾引导 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 56px;
  padding: 24px;
  border: 1px solid rgba(42, 52, 104, 0.9);
  border-radius: var(--ry-radius);
  background: linear-gradient(135deg, rgba(79, 227, 208, 0.1), rgba(255, 122, 92, 0.07));
}

.page-about .about-cta__title {
  margin: 0;
  font-size: 1.16rem;
  font-weight: 800;
  color: var(--ry-text);
}

.page-about .about-cta__text {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ry-muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 40px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero {
    padding: 44px 0 64px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--ry-header-h) + 28px);
    align-self: start;
  }

  .page-about .about-section + .about-section {
    margin-top: 88px;
  }

  .page-about .tl::before {
    left: 99px;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    padding-left: 0;
    padding-bottom: 40px;
  }

  .page-about .tl__dot {
    left: 94px;
    top: 20px;
  }

  .page-about .tl__year {
    padding-top: 12px;
  }

  .page-about .tl__body {
    margin-top: 0;
    padding-left: 34px;
  }

  .page-about .tl__item:nth-child(1) .tl__panel { max-width: 100%; }
  .page-about .tl__item:nth-child(2) .tl__panel { max-width: 93%; }
  .page-about .tl__item:nth-child(3) .tl__panel { max-width: 97%; }
  .page-about .tl__item:nth-child(4) .tl__panel { max-width: 89%; }
  .page-about .tl__item:nth-child(5) .tl__panel { max-width: 95%; }

  .page-about .tl__panel {
    padding: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .bar__fill {
    animation: none;
  }

  .page-about .tl__panel,
  .page-about .who__item {
    transition: none;
  }
}

.page-about {
  --bar-w: 1rem;
}