.page-about {
  --about-ink-soft: rgba(232, 241, 238, 0.76);
  --about-ink-faint: rgba(232, 241, 238, 0.6);
  --about-line: rgba(53, 242, 192, 0.18);
  --era-gap: clamp(20px, 3.5vw, 52px);
  position: relative;
  display: block;
}

.page-about [id] {
  scroll-margin-top: 96px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: 1rem 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 192, 0.4);
}

.page-about .crumbs a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .crumbs span {
  margin-inline: 0.5rem;
  color: var(--gray);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4.5vw, 3.6rem) clamp(1.6rem, 4vw, 3rem);
  background:
    linear-gradient(145deg, rgba(14, 58, 50, 0.88), rgba(16, 22, 26, 0.25) 68%),
    repeating-linear-gradient(90deg, rgba(53, 242, 192, 0.06) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(53, 242, 192, 0.06) 0 1px, transparent 1px 72px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1.1rem;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__title .hl {
  color: var(--amber);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 28px);
  margin: clamp(1.6rem, 3.5vw, 2.6rem) 0 0;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.35rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--cyan);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--sage);
}

/* ---------- 通用区块与标题 ---------- */
.page-about .about-block {
  padding-block: clamp(2rem, 5vw, 4rem);
}

.page-about .about-h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.25rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-sub {
  margin: 0 0 clamp(1.2rem, 2.6vw, 2rem);
  max-width: 66ch;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 年份索引条 ---------- */
.page-about .year-rail {
  list-style: none;
  margin: 0;
  padding: 0 0 0.6rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 76%);
  gap: var(--gap);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .year-rail::-webkit-scrollbar-thumb {
  background: rgba(53, 242, 192, 0.35);
}

.page-about .year-card {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.1rem 1.15rem 1.3rem;
  background: var(--slate);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .year-card:hover,
.page-about .year-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: #22343d;
}

.page-about .year-card__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .year-card__t {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .year-card__d {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--sage);
}

/* ---------- 阶段叙事 ---------- */
.page-about .about-era {
  border-top: 1px solid rgba(53, 242, 192, 0.1);
}

.page-about .era-grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 3rem);
  align-items: center;
}

.page-about .era-year {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .era-copy p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .era-list {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .era-list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: rgba(232, 241, 238, 0.86);
}

.page-about .era-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 192, 0.14);
}

.page-about .about-era--wide .era-copy {
  max-width: 72ch;
}

.page-about .era-media {
  margin: 0;
}

.page-about .era-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  clip-path: var(--cut-lg);
  filter: saturate(0.9) contrast(1.06) brightness(0.9);
}

.page-about .era-media figcaption {
  margin-top: 0.8rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--amber);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 全宽横幅 ---------- */
.page-about .about-banner {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(330px, 46vw, 520px);
  margin-block: clamp(1rem, 3vw, 2rem);
  overflow: hidden;
  clip-path: var(--cut-lg);
}

.page-about .about-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  z-index: 2;
}

.page-about .about-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(16, 22, 26, 0.28), rgba(16, 22, 26, 0.94));
}

.page-about .about-banner__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.58) saturate(0.92) contrast(1.08);
}

.page-about .about-banner__body {
  position: relative;
  z-index: 1;
  padding-block: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-banner__body p {
  margin: 0 0 0.9rem;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-banner__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 协作生态 ---------- */
.page-about .eco-band {
  position: relative;
  margin-block: clamp(1rem, 3vw, 2.4rem);
  padding-block: clamp(2rem, 5vw, 3.6rem);
  background: linear-gradient(155deg, var(--forest), var(--ink) 82%);
  clip-path: var(--cut-lg);
}

.page-about .eco-grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.page-about .eco-card {
  padding: 1.2rem 1.25rem 1.4rem;
  background: rgba(27, 42, 51, 0.78);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .eco-card:hover,
.page-about .eco-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .eco-card__num {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .eco-card__title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--mist);
}

.page-about .eco-card__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--about-ink-faint);
}

.page-about .eco-core {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  padding: 1.2rem 0.5rem;
  text-align: center;
}

.page-about .eco-core__disc {
  position: relative;
  display: grid;
  place-items: center;
  width: clamp(112px, 26vw, 148px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(53, 242, 192, 0.5);
  background: radial-gradient(circle at 50% 32%, rgba(53, 242, 192, 0.3), rgba(14, 58, 50, 0.92) 72%);
}

.page-about .eco-core__disc::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px dashed rgba(232, 180, 74, 0.45);
}

.page-about .eco-core__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .eco-core__hint {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--sage);
}

/* ---------- 团队 ---------- */
.page-about .team-bar {
  display: flex;
  gap: 3px;
  height: 10px;
  margin: clamp(1.1rem, 2.6vw, 1.7rem) 0;
}

.page-about .team-bar span {
  display: block;
  height: 100%;
}

.page-about .team-bar .seg-1 {
  flex: 32 1 0;
  background: var(--cyan);
}

.page-about .team-bar .seg-2 {
  flex: 18 1 0;
  background: var(--amber);
}

.page-about .team-bar .seg-3 {
  flex: 18 1 0;
  background: var(--sage);
}

.page-about .team-acc {
  display: grid;
  gap: 0.7rem;
}

.page-about .team-acc details {
  background: var(--slate);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  transition: border-color 0.25s ease;
}

.page-about .team-acc details[open] {
  border-color: rgba(53, 242, 192, 0.42);
}

.page-about .team-acc summary {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--mist);
}

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

.page-about .team-acc summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--cyan);
}

.page-about .team-acc details[open] summary::after {
  content: "–";
}

.page-about .team-acc .num {
  font-family: var(--font-mono);
  color: var(--amber);
}

.page-about .team-acc__body {
  padding: 0 1.15rem 1.2rem;
}

.page-about .team-acc__body p {
  margin: 0;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 年鉴 ---------- */
.page-about .yb-layout {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
}

.page-about .yb-cover {
  padding: 1.6rem 1.4rem 1.9rem;
  background: linear-gradient(160deg, #173f37, #0b1a1d 82%);
  border: 1px solid rgba(232, 180, 74, 0.35);
  clip-path: var(--cut-lg);
  position: relative;
}

.page-about .yb-cover::after {
  content: "";
  position: absolute;
  right: 1.2rem;
  top: 1.2rem;
  width: 44px;
  height: 3px;
  background: var(--amber);
}

.page-about .yb-cover__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .yb-cover__name {
  margin: 0.7rem 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .yb-cover__meta {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .yb-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.2rem;
}

.page-about .yb-nav a {
  padding: 0.42rem 0.85rem;
  font-size: 0.82rem;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(53, 242, 192, 0.3);
  clip-path: var(--cut-sm);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .yb-nav a:hover,
.page-about .yb-nav a:focus-visible {
  background: rgba(53, 242, 192, 0.14);
  color: var(--mist);
}

.page-about .yb-item {
  margin-bottom: 0.8rem;
  padding: 1rem 1.15rem 1.15rem;
  background: rgba(27, 42, 51, 0.55);
  border-left: 2px solid var(--cyan);
}

.page-about .yb-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--mist);
}

.page-about .yb-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-ink-faint);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding-block: clamp(2rem, 5vw, 3.6rem);
  border-top: 1px solid var(--about-line);
}

.page-about .cta-links {
  display: grid;
  gap: 0.7rem;
}

.page-about .cta-links a {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
  padding: 1rem 1.1rem 1.15rem;
  background: var(--slate);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .cta-links a:hover,
.page-about .cta-links a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .cta-links strong {
  font-size: 0.98rem;
  color: var(--mist);
}

.page-about .cta-links span {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--sage);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .era-grid {
    grid-template-columns: 1.02fr 0.98fr;
  }

  .page-about .about-era--flip .era-copy {
    order: 2;
  }

  .page-about .about-era--flip .era-media {
    order: 1;
  }

  .page-about .about-era--wide .era-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .year-rail {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .eco-grid {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
  }

  .page-about .eco-core {
    position: relative;
    padding-inline: 1.6rem;
  }

  .page-about .eco-core::before,
  .page-about .eco-core::after {
    content: "";
    position: absolute;
    top: 50%;
    width: clamp(12px, 2vw, 28px);
    height: 1px;
  }

  .page-about .eco-core::before {
    right: 100%;
    background: linear-gradient(90deg, rgba(53, 242, 192, 0), var(--cyan));
  }

  .page-about .eco-core::after {
    left: 100%;
    background: linear-gradient(90deg, var(--cyan), rgba(53, 242, 192, 0));
  }

  .page-about .yb-layout {
    grid-template-columns: 0.82fr 1.18fr;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .cta-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-card,
  .page-about .eco-card,
  .page-about .cta-links a {
    transition: none;
  }

  .page-about .year-card:hover,
  .page-about .year-card:focus-visible,
  .page-about .eco-card:hover,
  .page-about .eco-card:focus-visible,
  .page-about .cta-links a:hover,
  .page-about .cta-links a:focus-visible {
    transform: none;
  }
}