.page-about {
  --ab-line: rgba(155, 176, 188, 0.24);
  --ab-line-strong: rgba(155, 176, 188, 0.45);
  --ab-text: #C7D6DF;
  --ab-text-dim: #93A9B6;
  --ab-heading: #F3F7F2;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 1.5rem;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ab-text-dim);
}

.page-about .breadcrumb a {
  color: var(--ab-text-dim);
  text-decoration: none;
  transition: color 0.16s ease;
}

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

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--ab-line-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 1.5rem 0 2.5rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.5rem;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 0.75rem 0 0;
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ab-heading);
}

.page-about .about-hero__title span {
  display: block;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.02em;
}

.page-about .about-hero__aside {
  border-left: 1px solid var(--ab-line-strong);
  padding-left: 1rem;
}

.page-about .about-hero__aside .note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--ab-text-dim);
}

.page-about .about-hero__lede {
  margin: 2rem 0 0;
  max-width: 38em;
  color: var(--ab-text);
}

.page-about .about-hero__media {
  margin-top: 2.5rem;
}

/* ---------- 章节跳转 ---------- */
.page-about .about-jump {
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
  background: rgba(13, 34, 51, 0.55);
}

.page-about .about-jump__list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0.85rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-jump__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  border-color: var(--green);
  background: rgba(34, 224, 107, 0.1);
}

.page-about .about-jump__list .num {
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节外壳 ---------- */
.page-about .ab-band {
  padding: 3rem 0;
  scroll-margin-top: 1.5rem;
}

.page-about .ab-band--paper {
  background: var(--paper);
  color: #20323F;
  --ab-line: rgba(7, 19, 31, 0.14);
  --ab-line-strong: rgba(7, 19, 31, 0.3);
  --ab-text: #20323F;
  --ab-text-dim: #4E6573;
  --ab-heading: #07131F;
}

.page-about .ab-head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.75rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--ab-line-strong);
}

.page-about .ab-head__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  color: var(--green);
}

.page-about .ab-band--paper .ab-head__index {
  color: var(--green-deep);
}

.page-about .ab-head__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.18;
  color: var(--ab-heading);
  letter-spacing: -0.01em;
}

.page-about .ab-head__sub {
  margin: 0.55rem 0 0;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ab-text-dim);
}

.page-about .ab-body {
  display: grid;
  gap: 1.25rem;
}

.page-about .ab-note {
  padding-top: 0.85rem;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-note .note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--ab-text-dim);
}

.page-about .ab-main p {
  margin: 0 0 1.1rem;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-text);
}

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

.page-about .ab-main .ab-lead {
  margin-bottom: 1.5rem;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 300;
  line-height: 1.6;
  color: var(--ab-heading);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  max-width: 100%;
}

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

/* ---------- 02 流程 ---------- */
.page-about .flow-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .flow-steps {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  border: 1px solid var(--ab-line-strong);
  padding: 1.1rem 1.15rem 1.2rem;
  background: rgba(255, 255, 255, 0.55);
}

.page-about .flow-step__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: #C55A00;
}

.page-about .flow-step__title {
  margin: 0.35rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ab-heading);
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-text);
}

.page-about .flow-console {
  border: 1px solid var(--ab-line-strong);
  background: var(--ink);
  padding: 1.15rem 1.2rem 1.25rem;
  align-self: start;
}

.page-about .flow-console__head {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--green);
}

.page-about .flow-console__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-console__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0;
  border-bottom: 1px solid rgba(155, 176, 188, 0.2);
  font-size: 13.5px;
  color: #C7D6DF;
}

.page-about .flow-console__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .flow-console__val {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .flow-media {
  margin-top: 2rem;
}

/* ---------- 03 时间线 ---------- */
.page-about .tl {
  margin: 0;
  padding: 0 0 0 1.25rem;
  list-style: none;
  border-left: 1px solid var(--ab-line-strong);
}

.page-about .tl-item-wrap {
  position: relative;
}

.page-about .tl-item-wrap::before {
  content: "";
  position: absolute;
  left: -1.25rem;
  top: 0.55rem;
  width: 9px;
  height: 9px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .tl-item-wrap:not(:last-child) {
  padding-bottom: 0.35rem;
}

.page-about .tl-item {
  padding-bottom: 1.25rem;
}

.page-about .tl-sum {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  cursor: pointer;
  list-style: none;
  padding: 0.15rem 0;
}

.page-about .tl-sum::-webkit-details-marker {
  display: none;
}

.page-about .tl-sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--green-deep);
}

.page-about .tl-item[open] > .tl-sum::after {
  content: "−";
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .tl-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ab-heading);
  letter-spacing: 0.01em;
}

.page-about .tl-body p {
  margin: 0.65rem 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-text);
}

/* ---------- 04 规模 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.75rem;
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
}

.page-about .stat-cell {
  background: var(--ink);
  padding: 1.15rem 1rem 1.25rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.2vw, 2.3rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--green);
}

.page-about .stat-num small {
  margin-left: 0.15em;
  font-size: 0.5em;
  color: var(--orange-soft);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #9BB0BC;
}

.page-about .scale-body {
  margin-top: 2rem;
}

.page-about .metric-list {
  display: grid;
  gap: 0.75rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .metric {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .metric__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--green-deep);
  white-space: nowrap;
}

.page-about .metric__text {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ab-text);
}

/* ---------- 05 合作生态 ---------- */
.page-about .eco {
  position: relative;
  margin-top: 2rem;
}

.page-about .eco-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-about .eco-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .eco-chip {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--ab-line-strong);
  border-radius: var(--radius);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ab-text-dim);
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.page-about .eco-chip:hover {
  border-color: var(--green);
  color: var(--green);
}

.page-about .eco-radio:focus-visible ~ .eco-chips {
  outline: 2px solid var(--green);
  outline-offset: 4px;
}

.page-about #eco-all:checked ~ .eco-chips label[for="eco-all"],
.page-about #eco-data:checked ~ .eco-chips label[for="eco-data"],
.page-about #eco-video:checked ~ .eco-chips label[for="eco-video"],
.page-about #eco-media:checked ~ .eco-chips label[for="eco-media"],
.page-about #eco-club:checked ~ .eco-chips label[for="eco-club"] {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink);
  font-weight: 700;
}

.page-about .eco-grid {
  display: grid;
  gap: 1rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about #eco-data:checked ~ .eco-grid .eco-card:not(.eco-card--data),
.page-about #eco-video:checked ~ .eco-grid .eco-card:not(.eco-card--video),
.page-about #eco-media:checked ~ .eco-grid .eco-card:not(.eco-card--media),
.page-about #eco-club:checked ~ .eco-grid .eco-card:not(.eco-card--club) {
  display: none;
}

.page-about .eco-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.1rem 1.1rem 1.2rem;
  border: 1px solid var(--ab-line-strong);
  background: var(--ink-2);
}

.page-about .eco-card__num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .eco-card__name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .eco-card__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: #9BB0BC;
}

.page-about .eco-media {
  margin-top: 1.75rem;
}

.page-about .honor-block {
  margin-top: 2.25rem;
}

.page-about .honor-heading {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ab-heading);
  letter-spacing: 0.02em;
}

.page-about .honor-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .honor {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: 0.8rem 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .honor__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--green);
}

.page-about .honor__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text);
}

/* ---------- 06 原则 ---------- */
.page-about .principle-grid {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.75rem;
}

.page-about .principle {
  border-left: 2px solid var(--green-deep);
  padding: 0.3rem 0 0.3rem 1rem;
}

.page-about .principle__title {
  margin: 0 0 0.35rem;
  font-size: 15px;
  font-weight: 700;
  color: var(--ab-heading);
  letter-spacing: 0.01em;
}

.page-about .principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ab-text);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--ab-line);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 2rem 0 3.25rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) var(--note-w);
    gap: 3rem;
  }

  .page-about .about-hero__aside {
    padding-left: 1.5rem;
  }

  .page-about .about-hero__lede {
    margin-top: 2.25rem;
    font-size: 17px;
    line-height: 1.9;
  }

  .page-about .about-hero__media {
    margin-top: 3rem;
  }

  .page-about .ab-band {
    padding: 4.5rem 0;
  }

  .page-about .ab-head {
    grid-template-columns: var(--note-w) minmax(0, 1fr);
    gap: 3rem;
    align-items: baseline;
    margin-bottom: 2.25rem;
    padding-top: 1.5rem;
  }

  .page-about .ab-head__index {
    font-size: 3.6rem;
  }

  .page-about .ab-body {
    grid-template-columns: var(--note-w) minmax(0, 1fr);
    gap: 3rem;
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 2rem;
    align-items: start;
    margin-top: 2.25rem;
  }

  .page-about .flow-steps {
    gap: 1.1rem;
  }

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

  .page-about .metric {
    grid-template-columns: 7.5rem minmax(0, 1fr);
  }

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

  .page-about .eco-media {
    margin-top: 2.25rem;
  }

  .page-about .tl {
    padding-left: 1.75rem;
  }

  .page-about .tl-item-wrap::before {
    left: -1.75rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    font-size: 4.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__list a,
  .page-about .eco-chip,
  .page-about .breadcrumb a {
    transition: none;
  }
}
<<<END>>>