.page-about {
  --ab-rail: 168px;
  --ab-gap: clamp(1.4rem, 4vw, 3.4rem);
  --ab-hair: rgba(243, 240, 230, 0.12);
  --ab-glow-lamp: rgba(255, 194, 75, 0.22);
  background: var(--turf);
  color: var(--fog);
  overflow-x: hidden;
}

.page-about .wrap {
  width: 100%;
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 2.4vw, 1.6rem);
  padding-bottom: clamp(0.6rem, 1.6vw, 1rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1rem, 2.6vw, 2rem) 0 clamp(2.2rem, 5vw, 3.6rem);
  background:
    radial-gradient(120% 90% at 12% -10%, rgba(255, 194, 75, 0.16), transparent 58%),
    radial-gradient(90% 80% at 88% 8%, rgba(53, 208, 192, 0.12), transparent 62%),
    linear-gradient(180deg, var(--turf-2), var(--turf) 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sodium), var(--mint) 45%, transparent 88%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 0 40%);
  opacity: 0.55;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 0.9rem;
  color: var(--cyan);
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 1.1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 3.9rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.06;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(1rem, 2.1vw, 1.08rem);
  line-height: 1.85;
  color: rgba(243, 240, 230, 0.86);
}

.page-about .about-facts {
  display: grid;
  gap: 0.9rem;
  margin: clamp(1.6rem, 3.6vw, 2.4rem) 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-facts__cell dt {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(243, 240, 230, 0.56);
}

.page-about .about-facts__cell dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  letter-spacing: 0.02em;
  color: var(--sodium-soft);
}

/* 章节索引 */
.page-about .about-index {
  position: relative;
  padding: 1.1rem 1.15rem 1.3rem;
  border: 1px solid var(--ab-hair);
  border-radius: var(--r-l);
  background: linear-gradient(160deg, rgba(43, 47, 44, 0.68), rgba(11, 13, 12, 0.72));
}

.page-about .about-index__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sodium);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.5rem 0.4rem;
  border-radius: var(--r-s);
  color: rgba(243, 240, 230, 0.84);
  font-size: 0.95rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  color: var(--grass);
  letter-spacing: 0.06em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--sodium-soft);
  background: rgba(255, 194, 75, 0.08);
}

.page-about .about-index__list a[aria-current="location"] {
  color: var(--turf);
  background: var(--sodium);
}

.page-about .about-index__list a[aria-current="location"] .about-index__num {
  color: rgba(7, 26, 20, 0.62);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding: clamp(2.4rem, 6vw, 4.6rem) 0;
}

.page-about .section--seam {
  border-top: 1px solid var(--ab-hair);
  background: linear-gradient(180deg, rgba(43, 47, 44, 0.34), transparent 62%);
}

.page-about .chapter {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.page-about .chapter__num {
  font-family: var(--font-num);
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--sodium);
  opacity: 0.62;
}

.page-about .chapter__kicker {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(243, 240, 230, 0.52);
  white-space: nowrap;
}

.page-about .chapter__body h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.2;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .chapter__body h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-body);
  font-size: clamp(1.02rem, 2.4vw, 1.16rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .chapter__body p {
  margin: 0 0 0.95rem;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 240, 230, 0.82);
}

.page-about .chapter__body .lede {
  max-width: 62ch;
  font-size: clamp(1rem, 2.2vw, 1.06rem);
  color: rgba(243, 240, 230, 0.9);
  padding-left: 0.95rem;
  border-left: 2px solid var(--sodium);
}

.page-about .note {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(243, 240, 230, 0.58);
}

/* 引文 */
.page-about .about-quote {
  position: relative;
  margin: 1.5rem 0 1.4rem;
  padding: 1.15rem 0 1.15rem 1.3rem;
  border-left: 3px solid var(--sodium);
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.8vw, 1.32rem);
  font-style: italic;
  line-height: 1.7;
  color: var(--sodium-soft);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 0.7rem;
  font-family: var(--font-num);
  font-size: 0.74rem;
  font-style: normal;
  letter-spacing: 0.12em;
  color: rgba(243, 240, 230, 0.5);
}

/* 图片 */
.page-about .about-figure {
  margin: 1.4rem 0 0;
  border-radius: var(--r-l);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(255, 194, 75, 0.16), rgba(53, 208, 192, 0.1) 55%, rgba(11, 13, 12, 0.6));
}

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

.page-about .about-figure .media-frame__cap {
  display: block;
  padding: 0.7rem 0.9rem;
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: rgba(243, 240, 230, 0.6);
  background: rgba(11, 13, 12, 0.6);
}

/* ---------- 时间线 ---------- */
.page-about .season {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0 0 0 1.15rem;
  border-left: 2px solid transparent;
  border-image: linear-gradient(180deg, var(--sodium), var(--cyan) 60%, var(--grass)) 1;
}

.page-about .season__item {
  position: relative;
  padding: 0 0 1.7rem 1.15rem;
}

.page-about .season__item::before {
  content: "";
  position: absolute;
  left: -1.52rem;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--concrete);
  border: 2px solid var(--sodium);
  transition: box-shadow var(--speed) var(--ease), background var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .season__item:hover::before,
.page-about .season__item:focus-within::before {
  background: var(--sodium-soft);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.16), 0 0 18px rgba(255, 194, 75, 0.55);
  transform: scale(1.12);
}

.page-about .season__year {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-family: var(--font-num);
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .season__info p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: rgba(243, 240, 230, 0.8);
}

.page-about .season__item--now::before {
  background: var(--sodium);
  border-color: var(--sodium-soft);
}

.page-about .season__item--now .season__year {
  color: var(--sodium);
}

/* ---------- 内容体系 ---------- */
.page-about .system-grid {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
  margin: 1.6rem 0 0.6rem;
}

.page-about .system-figure {
  padding: 0.6rem;
  border: 1px solid var(--ab-hair);
  border-radius: var(--r-l);
  background: radial-gradient(90% 70% at 30% 10%, rgba(255, 194, 75, 0.1), transparent 70%), rgba(10, 32, 25, 0.72);
}

.page-about .stand-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .stand-svg__label {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.04em;
  fill: #F3F0E6;
}

.page-about .stand-svg__label--hot {
  fill: #FFE7A3;
}

.page-about .stand-svg__caption {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.06em;
  fill: rgba(243, 240, 230, 0.6);
}

.page-about .stand-svg__tier {
  transition: opacity var(--speed) var(--ease);
}

.page-about .stand-svg__tier:hover {
  opacity: 0.82;
}

.page-about .lamp-key {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .lamp-key__item {
  padding: 0.9rem 1rem;
  border-left: 2px solid rgba(243, 240, 230, 0.14);
  background: rgba(43, 47, 44, 0.4);
  border-radius: 0 var(--r-m) var(--r-m) 0;
}

.page-about .lamp-key__item p {
  margin: 0.55rem 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(243, 240, 230, 0.78);
}

.page-about .lamp-key__item .tag {
  display: inline-block;
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 0.9rem;
  margin: 1.5rem 0 1.8rem;
}

.page-about .crew__card {
  padding: 1.1rem 1.1rem 1.2rem;
  border-radius: var(--r-m);
  border: 1px solid var(--ab-hair);
  border-top-width: 3px;
  background: rgba(11, 13, 12, 0.52);
}

.page-about .crew__card--lamp { border-top-color: var(--sodium); }
.page-about .crew__card--grass { border-top-color: var(--grass); }
.page-about .crew__card--cyan { border-top-color: var(--cyan); }
.page-about .crew__card--red { border-top-color: var(--red); }

.page-about .crew__num {
  margin: 0 0 0.35rem;
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sodium-soft);
}

.page-about .crew__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(243, 240, 230, 0.76);
}

.page-about .relay {
  margin-top: 0.6rem;
  padding: clamp(1.1rem, 3vw, 1.8rem);
  border-radius: var(--r-l);
  background: linear-gradient(150deg, rgba(46, 125, 91, 0.18), rgba(11, 13, 12, 0.55) 70%);
  border: 1px solid var(--ab-hair);
}

.page-about .relay__title {
  margin: 0 0 0.9rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--sodium-soft);
}

.page-about .relay__list {
  list-style: none;
  counter-reset: relay;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .relay__list li {
  counter-increment: relay;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: rgba(243, 240, 230, 0.84);
}

.page-about .relay__list li::before {
  content: counter(relay, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 0.78rem;
  color: var(--cyan);
  letter-spacing: 0.08em;
  flex: 0 0 auto;
}

/* ---------- 城市协作 ---------- */
.page-about .eco {
  position: relative;
  overflow: hidden;
}

.page-about .eco__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .eco__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.85);
}

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

.page-about .eco-stats {
  list-style: none;
  margin: 1.5rem 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .eco-stats__item {
  padding: 1rem 1.05rem;
  border-radius: var(--r-m);
  border: 1px solid var(--ab-hair);
  background: rgba(11, 13, 12, 0.62);
  backdrop-filter: blur(2px);
}

.page-about .eco-stats__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 4.6vw, 2.2rem);
  line-height: 1;
  color: var(--sodium);
  letter-spacing: -0.01em;
}

.page-about .eco-stats__label {
  display: block;
  margin: 0.3rem 0 0.55rem;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--mint);
}

.page-about .eco-stats__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(243, 240, 230, 0.76);
}

.page-about .eco__note {
  max-width: 66ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 240, 230, 0.86);
}

/* ---------- 合作原则 ---------- */
.page-about .principles {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0 1.9rem;
}

.page-about .principle {
  border: 1px solid var(--ab-hair);
  border-radius: var(--r-m);
  background: rgba(43, 47, 44, 0.38);
  overflow: hidden;
}

.page-about .principle[open] {
  background: linear-gradient(160deg, rgba(255, 194, 75, 0.08), rgba(11, 13, 12, 0.5));
  border-color: rgba(255, 194, 75, 0.32);
}

.page-about .principle__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 0.8rem;
  padding: 0.95rem 1rem;
  cursor: pointer;
  list-style: none;
  transition: background var(--speed) var(--ease);
}

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

.page-about .principle__summary:hover,
.page-about .principle__summary:focus-visible {
  background: rgba(255, 194, 75, 0.07);
}

.page-about .principle__title {
  flex: 1 1 12rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .principle__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--sodium);
  transition: transform var(--speed) var(--ease);
}

.page-about .principle[open] .principle__summary::after {
  content: "−";
}

.page-about .principle__body {
  padding: 0 1rem 1.1rem;
  border-top: 1px solid var(--ab-hair);
}

.page-about .principle__body p {
  margin: 0.85rem 0 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(243, 240, 230, 0.8);
}

.page-about .principle__tag {
  display: inline-block;
  flex: 0 0 auto;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: clamp(1.2rem, 3vw, 1.8rem);
  border-radius: var(--r-l);
  border: 1px solid rgba(255, 194, 75, 0.26);
  background:
    radial-gradient(80% 120% at 8% 0%, rgba(255, 194, 75, 0.16), transparent 62%),
    linear-gradient(150deg, rgba(10, 32, 25, 0.9), rgba(11, 13, 12, 0.92));
}

.page-about .about-cta__text {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.7vw, 1.28rem);
  line-height: 1.7;
  color: var(--sodium-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .chapter {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(1.6rem, 3.4vw, 3rem);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    position: sticky;
    top: 1.5rem;
  }

  .page-about .chapter__body--split {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(1.4rem, 3vw, 2.4rem);
    align-items: start;
  }

  .page-about .chapter__body--split .about-figure {
    margin-top: 0.2rem;
  }

  .page-about .system-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-about .season {
    padding-left: 0;
  }

  .page-about .season__item {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 1.1rem;
    padding-left: 1.3rem;
  }

  .page-about .season__item::before {
    left: -0.36rem;
  }

  .page-about .season__year {
    text-align: right;
    padding-top: 0.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season__item::before,
  .page-about .principle__summary,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .season__item:hover::before {
    transform: none;
  }
}
<<<END>>>