.page-about {
  --about-line: rgba(11, 14, 20, 0.14);
  --about-text: rgba(11, 14, 20, 0.76);
  --about-text-dark: rgba(245, 247, 250, 0.74);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3.4vw, 32px);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.page-about .breadcrumb__sep {
  color: var(--steel);
  opacity: 0.6;
}

.page-about .about-h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.018em;
  line-height: 1.16;
  margin: 8px 0 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 54px);
  align-items: start;
}

.page-about .about-hero__title {
  font-size: clamp(2rem, 7.2vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.022em;
  line-height: 1.04;
  margin: 12px 0 18px;
  max-width: 12ch;
}

.page-about .about-hero__intro {
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.72;
  color: var(--about-text);
  margin: 0;
  max-width: 46ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  line-height: 1;
  color: var(--blue);
}

.page-about .about-hero__facts em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--muted);
}

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

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

/* ---------- 时间轴 + 叙事 ---------- */
.page-about .about-journey {
  background: linear-gradient(180deg, var(--paper) 0%, #ffffff 38%, var(--paper) 100%);
}

.page-about .about-journey__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 58px);
  align-items: start;
}

.page-about .tl-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 4px 0 4px 22px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl-node {
  position: relative;
  display: block;
  padding: 0 0 24px;
  outline: none;
}

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

.page-about .tl-node__dot {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--steel);
  opacity: 0.55;
}

.page-about .tl-node:last-child .tl-node__dot {
  background: var(--neon);
  opacity: 1;
  box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.18);
  animation: about-pulse 1.6s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.18);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 7px rgba(0, 230, 118, 0.06);
    opacity: 0.6;
  }
}

.page-about .tl-node__phase {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .tl-node__title {
  display: block;
  margin-top: 5px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .tl-node__note {
  display: block;
  margin-top: 7px;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--muted);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease);
}

.page-about .tl-node:hover .tl-node__note,
.page-about .tl-node:focus .tl-node__note,
.page-about .tl-node:focus-within .tl-node__note {
  max-height: 7rem;
  opacity: 1;
}

.page-about .about-journey__body p {
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-text);
  margin: 0 0 17px;
  max-width: 62ch;
}

.page-about .journey-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .journey-points li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 4px;
  background: transparent;
}

.page-about .journey-points__k {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.5rem;
  color: var(--blue);
  min-width: 4.5ch;
}

.page-about .journey-points__v {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--about-text);
}

.page-about .journey-more {
  margin-top: 22px;
}

/* ---------- 呼吸段 ---------- */
.page-about .about-breath {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(64px, 13vw, 140px) 0;
}

.page-about .about-breath__inner {
  max-width: 900px;
}

.page-about .about-breath__rule {
  display: block;
  width: min(100%, 420px);
  height: 1px;
  margin-bottom: 30px;
  background: linear-gradient(90deg, var(--neon) 0%, rgba(0, 230, 118, 0) 100%);
  transform-origin: left center;
}

@supports (animation-timeline: view()) {
  .page-about .about-breath__rule {
    animation: about-rule-in linear both;
    animation-timeline: view();
    animation-range: entry 15% cover 40%;
  }

  @keyframes about-rule-in {
    from {
      opacity: 0;
      transform: scaleX(0.15);
    }
    to {
      opacity: 1;
      transform: scaleX(1);
    }
  }
}

.page-about .about-breath__text {
  margin: 0;
  font-size: clamp(1.4rem, 4.6vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.28;
  max-width: 22ch;
}

.page-about .about-breath__text span {
  color: var(--neon);
}

/* ---------- 流程 ---------- */
.page-about .flow-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 44px;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .flow-head .about-h2 {
  margin-bottom: 0;
}

.page-about .flow-head__lead {
  flex: 1 1 320px;
  max-width: 42ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 6px 20px;
  padding: 24px 18px 24px 20px;
  border-bottom: 1px solid var(--about-line);
  background: transparent;
  transition: background 0.3s var(--ease);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 26px;
  background: var(--blue);
  transition: height 0.42s var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  background: rgba(0, 87, 184, 0.04);
}

.page-about .flow-step:hover::before,
.page-about .flow-step:focus-within::before {
  height: 100%;
}

.page-about .flow-step__idx {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.7rem, 4.4vw, 2.4rem);
  line-height: 1;
  color: var(--blue);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .flow-step__idx {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--blue);
  }

  .page-about .flow-step:hover .flow-step__idx,
  .page-about .flow-step:focus-within .flow-step__idx {
    color: var(--blue);
  }
}

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

.page-about .flow-step__title {
  margin: 2px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .flow-step__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-text);
  max-width: 60ch;
}

.page-about .about-flow__figure {
  margin: clamp(30px, 5vw, 48px) 0 0;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

.page-about .about-reach__copy p {
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-text);
  margin: 0 0 17px;
  max-width: 60ch;
}

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

.page-about .reach-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 14px;
}

.page-about .reach-stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .reach-stats__v {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.7rem, 5.4vw, 2.5rem);
  line-height: 1;
  color: var(--space);
}

.page-about .reach-stats li:nth-child(1) .reach-stats__v,
.page-about .reach-stats li:nth-child(4) .reach-stats__v {
  color: var(--blue);
}

.page-about .reach-stats__k {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--mist);
}

.page-about .about-team__head {
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-team__lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  min-height: 190px;
}

.page-about .team-card .card__id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .team-card .card__title {
  margin: 4px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .team-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--about-text-dark);
}

/* ---------- 接下来 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .next-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .next-list__k {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 15.5px;
  font-weight: 700;
}

.page-about .next-list__k::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--alert);
  transform: rotate(45deg);
}

.page-about .next-list__v {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-text);
}

/* ---------- 站内指引 ---------- */
.page-about .about-links {
  background: var(--space);
}

.page-about .about-links__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .link-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  text-decoration: none;
  color: var(--paper);
  background: rgba(245, 247, 250, 0.05);
  border: 1px solid var(--hair-dark);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .link-card:hover,
.page-about .link-card:focus-visible {
  border-color: var(--neon);
  background: rgba(245, 247, 250, 0.09);
  transform: translateY(-2px);
  outline: none;
}

.page-about .link-card__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .link-card__t {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
}

/* ---------- 响应式 ---------- */
@media (max-width: 899px) {
  .page-about .tl-node__note {
    max-height: none;
    opacity: 1;
  }
}

@media (min-width: 720px) {
  .page-about .journey-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    background: transparent;
  }

  .page-about .journey-points li {
    padding: 16px 20px 16px 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .journey-points li:last-child {
    border-right: none;
    padding-left: 20px;
  }

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

  .page-about .next-list li {
    grid-template-columns: 250px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 22px 0;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

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

  .page-about .about-journey__rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .flow-step {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 8px 26px;
    padding: 28px 24px 28px 26px;
  }
}

@media (min-width: 1060px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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