.page-about {
  --about-line: rgba(47, 125, 80, 0.32);
  --about-line-soft: rgba(47, 125, 80, 0.18);
  --about-mist-strong: rgba(215, 222, 217, 0.88);
  --about-mist-soft: rgba(215, 222, 217, 0.66);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
}

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

.page-about :focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.2vw, 34px) 0 clamp(34px, 5vw, 68px);
  background:
    radial-gradient(120% 92% at 14% -6%, rgba(28, 81, 54, 0.88) 0%, rgba(6, 18, 14, 0) 62%),
    linear-gradient(180deg, #071811 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(47, 125, 80, 0.16) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(47, 125, 80, 0.1) 0 1px, transparent 1px 92px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  margin-top: clamp(20px, 3vw, 34px);
  color: var(--neon-dim);
}

.page-about .about-hero__title {
  margin: 0.3em 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 8.4vw, 112px);
  line-height: 0.98;
  letter-spacing: 0.005em;
  color: var(--cream);
  text-wrap: balance;
}

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

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  font-size: clamp(15.5px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--about-mist-strong);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px dashed var(--about-line);
  display: grid;
  gap: clamp(14px, 2vw, 26px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.2vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-hero__lab {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--about-mist-soft);
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 首屏长图 ---------- */
.page-about .about-banner {
  margin: 0;
  border-bottom: 1px solid var(--about-line);
  background: #040d0a;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(38px, 6vw, 84px);
  padding-bottom: clamp(38px, 6vw, 84px);
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
  }
}

/* ---------- 侧栏年表 ---------- */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon-dim);
}

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

.page-about .about-rail .toc__link {
  display: block;
  padding: 9px 12px 9px 14px;
  border-left: 2px solid rgba(215, 222, 217, 0.16);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--about-mist-soft);
  text-decoration: none;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .about-rail .toc__link:hover,
.page-about .about-rail .toc__link[aria-current="location"] {
  color: var(--neon);
  border-left-color: var(--neon);
  transform: translateX(3px);
}

@media (min-width: 1040px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }
}

@media (max-width: 1039px) {
  .page-about .about-rail__title {
    margin-bottom: 8px;
  }

  .page-about .about-rail__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-rail__list li {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .page-about .about-rail .toc__link {
    border-left: 0;
    border: 1px solid rgba(215, 222, 217, 0.22);
    border-radius: 999px;
    padding: 6px 14px;
    white-space: nowrap;
  }

  .page-about .about-rail .toc__link:hover {
    transform: none;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  margin-bottom: clamp(44px, 6vw, 80px);
}

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

.page-about .about-chapter::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(20px, 3vw, 34px);
  background: repeating-linear-gradient(90deg, var(--about-line) 0 12px, transparent 12px 26px);
}

.page-about .about-chapter__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon-dim);
}

.page-about .about-chapter h2 {
  margin: 0.28em 0 0.7em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.08;
  letter-spacing: 0.005em;
  color: var(--cream);
}

.page-about .about-chapter__text p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.9;
  color: var(--about-mist-strong);
}

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

.page-about .about-chapter__tail {
  max-width: 70ch;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--turf-2);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-mist-soft);
}

.page-about .about-chapter__text a,
.page-about .about-chapter__tail a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 255, 61, 0.4);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .about-chapter__text a:hover,
.page-about .about-chapter__tail a:hover {
  color: var(--neon-dim);
  border-bottom-color: var(--neon-dim);
}

.page-about .about-chapter__cols {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

@media (min-width: 780px) {
  .page-about .about-chapter__cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-chapter__media {
  margin: 0;
  border: 1px solid var(--about-line);
  padding: 8px;
  background: var(--ink-2);
}

.page-about .about-chapter__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 三道工序 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  background: rgba(12, 36, 26, 0.78);
  border: 1px solid var(--about-line-soft);
  border-left: 3px solid var(--turf-2);
  border-radius: var(--r);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-steps__item:hover {
  transform: translateY(-2px);
  border-left-color: var(--neon);
}

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-steps__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-mist-soft);
}

/* ---------- 奶油田纸面板章节 ---------- */
.page-about .about-chapter--paper {
  background: var(--cream);
  color: var(--ink-text);
  padding: clamp(22px, 3.6vw, 46px);
  border-radius: var(--r);
  border-left: 5px solid var(--turf);
  box-shadow: 0 0 0 1px rgba(28, 81, 54, 0.16);
}

.page-about .about-chapter--paper::before {
  display: none;
}

.page-about .about-chapter--paper .about-chapter__stage {
  color: var(--turf);
}

.page-about .about-chapter--paper h2 {
  color: var(--ink);
}

.page-about .about-chapter--paper .about-chapter__text p {
  color: #2c3a32;
}

.page-about .about-chapter--paper .about-chapter__text a {
  color: var(--red);
  border-bottom-color: rgba(201, 51, 31, 0.35);
}

.page-about .about-chapter--paper .about-chapter__text a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-chapter__tail--paper {
  border-left-color: var(--turf);
  color: #45544b;
}

.page-about .about-chapter__tail--paper a {
  color: var(--red);
  border-bottom-color: rgba(201, 51, 31, 0.35);
}

/* ---------- 地图 ---------- */
.page-about .about-map-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 10px;
  background: var(--paper);
  border: 1px solid rgba(28, 81, 54, 0.32);
}

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

.page-about .about-chapter--paper .img-frame__caption {
  color: #4d5c53;
  padding: 10px 4px 2px;
}

.page-about .about-map-zoom {
  margin-top: 18px;
}

.page-about .about-map-zoom summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  padding: 9px 18px;
  border: 1px solid var(--turf);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: transparent;
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

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

.page-about .about-map-zoom summary::before {
  content: "+";
  font-size: 15px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-map-zoom[open] summary::before {
  content: "–";
}

.page-about .about-map-zoom summary:hover {
  background: var(--turf);
  color: var(--cream);
}

.page-about .about-map-zoom summary:hover::before {
  color: var(--neon);
}

.page-about .about-map-zoom__figure {
  margin: 16px 0 0;
  padding: 8px;
  background: var(--paper);
  border: 1px dashed rgba(28, 81, 54, 0.4);
}

.page-about .about-map-zoom__figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 协作数字 ---------- */
.page-about .about-numbers {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-numbers__item {
  background: var(--ink-2);
  padding: clamp(16px, 2.2vw, 24px) clamp(14px, 2vw, 20px);
}

.page-about .about-numbers__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--neon);
}

.page-about .about-numbers__lab {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--about-mist-soft);
}

@media (min-width: 760px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--about-line);
  background:
    radial-gradient(90% 120% at 88% 10%, rgba(28, 81, 54, 0.6) 0%, rgba(6, 18, 14, 0) 62%),
    linear-gradient(135deg, var(--ink-2) 0%, var(--ink) 100%);
  padding: clamp(36px, 5vw, 74px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 14px;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.2vw, 54px);
  line-height: 1.05;
  color: var(--cream);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-mist-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

@media (max-width: 480px) {
  .page-about .about-cta__actions .btn {
    width: 100%;
    justify-content: center;
  }
}
<<<END>>>