.page-about {
  --about-line: rgba(138, 106, 44, 0.36);
  --about-line-soft: rgba(198, 207, 210, 0.13);
  --about-card-bg: linear-gradient(158deg, rgba(18, 53, 42, 0.94), rgba(10, 31, 24, 0.99));
  --about-organic: radial-gradient(120% 90% at 12% 0%, rgba(216, 182, 92, 0.10), transparent 62%);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: var(--s3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background-image: var(--about-organic);
  padding-block: clamp(28px, 5vw, 56px) clamp(48px, 8vw, 92px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--s4);
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 7.4vw, 60px);
  line-height: 1.16;
  letter-spacing: 0.005em;
  margin: var(--s2) 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: var(--s3);
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-top: var(--s4);
}

.page-about .about-toc {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: 16px 4px 16px 4px;
  background: linear-gradient(160deg, rgba(27, 34, 51, 0.74), rgba(10, 31, 24, 0.94));
}

.page-about .about-toc::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid var(--about-line-soft);
  border-radius: 12px 3px 12px 3px;
  pointer-events: none;
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin: 0 0 var(--s3);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
  display: grid;
  gap: 10px;
}

.page-about .about-toc__list li {
  counter-increment: toc;
  border-bottom: 1px solid var(--about-line-soft);
  padding-bottom: 10px;
}

.page-about .about-toc__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-toc__link::before {
  content: "0" counter(toc);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-gold-dark);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--c-gold);
  transform: translateX(3px);
}

/* ---------- 通用标题与段落 ---------- */
.page-about .about-h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.28;
  margin: var(--s2) 0 var(--s3);
  max-width: 24ch;
}

.page-about .about-p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0 0 var(--s3);
  max-width: 62ch;
}

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

.page-about .about-more {
  margin: var(--s3) 0 0;
}

.page-about .about-more__link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 182, 92, 0.34);
  padding-bottom: 2px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-more__link::after {
  content: " →";
  display: inline-block;
  transition: transform 0.25s var(--ease);
}

.page-about .about-more__link:hover,
.page-about .about-more__link:focus-visible {
  color: var(--c-ivory);
  border-color: var(--c-gold);
}

.page-about .about-more__link:hover::after,
.page-about .about-more__link:focus-visible::after {
  transform: translateX(4px);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__figure {
  margin: var(--s4) 0 var(--s5);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--about-line);
  display: grid;
  gap: var(--s4);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: var(--s1);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 1px solid var(--c-gold);
  box-shadow: 0 0 0 5px rgba(216, 182, 92, 0.09);
  transition: box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--c-gold);
  box-shadow: 0 0 0 8px rgba(216, 182, 92, 0.16);
}

.page-about .timeline__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-gold-dark);
  margin-bottom: 6px;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-silver);
  margin: 0 0 8px;
}

.page-about .timeline__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.6vw, 23px);
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--c-ivory);
}

.page-about .timeline__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-quiet);
  margin: 0;
  max-width: 58ch;
}

/* ---------- 四条服务线 ---------- */
.page-about .lines-grid {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s4);
}

.page-about .line-card {
  position: relative;
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--about-card-bg);
  border: 1px solid var(--about-line-soft);
  border-radius: 18px 5px 18px 5px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(20px, 3.4vw, 32px);
  bottom: clamp(20px, 3.4vw, 32px);
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), rgba(138, 106, 44, 0.15));
  border-radius: 2px;
}

.page-about .line-card:hover,
.page-about .line-card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(216, 182, 92, 0.5);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.9);
}

.page-about .line-card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold-dark);
  margin: 0 0 10px;
}

.page-about .line-card__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--c-ivory);
}

.page-about .line-card__body {
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
  margin: 0;
}

.page-about .line-card__fold {
  margin-top: var(--s3);
  border-top: 1px solid var(--about-line-soft);
  padding-top: var(--s2);
}

.page-about .line-card__fold .fold__summary {
  cursor: pointer;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--c-gold);
}

.page-about .line-card__list {
  list-style: none;
  margin: var(--s2) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .line-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-quiet);
}

.page-about .line-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--c-gold-dark);
}

/* ---------- 刷新与赛季节奏 ---------- */
.page-about .rhythm__grid {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s4);
}

.page-about .rhythm__figure {
  margin: 0;
  max-width: 320px;
  width: 100%;
  justify-self: center;
}

.page-about .rhythm__ring {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
}

.page-about .ring {
  width: 100%;
  height: 100%;
  display: block;
}

.page-about .ring__track {
  fill: none;
  stroke: rgba(198, 207, 210, 0.12);
  stroke-width: 2;
}

.page-about .ring__seg {
  fill: none;
  stroke: rgba(198, 207, 210, 0.26);
  stroke-width: 2;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 100px 100px;
  transition: stroke 0.3s var(--ease), stroke-width 0.3s var(--ease);
}

.page-about .ring__seg--1 { stroke-dasharray: 104 385.6; stroke-dashoffset: 0; }
.page-about .ring__seg--2 { stroke-dasharray: 104 385.6; stroke-dashoffset: -122.4; }
.page-about .ring__seg--3 { stroke-dasharray: 104 385.6; stroke-dashoffset: -244.8; }
.page-about .ring__seg--4 { stroke-dasharray: 104 385.6; stroke-dashoffset: -367.2; }

.page-about .ring__core {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  letter-spacing: 0.04em;
  color: var(--c-gold);
}

.page-about .ring-node {
  position: absolute;
  width: 34px;
  height: 34px;
  margin: -17px 0 0 -17px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  cursor: pointer;
}

.page-about .ring-node__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 1.5px solid var(--c-gold);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ring-node:hover .ring-node__dot,
.page-about .ring-node:focus-visible .ring-node__dot {
  background: var(--c-gold);
  transform: scale(1.55);
}

.page-about .ring-node:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
}

.page-about .ring-node--1 { left: 50%; top: 11%; }
.page-about .ring-node--2 { left: 89%; top: 50%; }
.page-about .ring-node--3 { left: 50%; top: 89%; }
.page-about .ring-node--4 { left: 11%; top: 50%; }

.page-about .rhythm__figure:has(.ring-node--1:hover) .ring__seg--1,
.page-about .rhythm__figure:has(.ring-node--1:focus-visible) .ring__seg--1,
.page-about .rhythm__figure:has(.ring-node--2:hover) .ring__seg--2,
.page-about .rhythm__figure:has(.ring-node--2:focus-visible) .ring__seg--2,
.page-about .rhythm__figure:has(.ring-node--3:hover) .ring__seg--3,
.page-about .rhythm__figure:has(.ring-node--3:focus-visible) .ring__seg--3,
.page-about .rhythm__figure:has(.ring-node--4:hover) .ring__seg--4,
.page-about .rhythm__figure:has(.ring-node--4:focus-visible) .ring__seg--4 {
  stroke: var(--c-gold);
  stroke-width: 3;
}

.page-about .ring-readout {
  display: grid;
  gap: 8px;
  margin: var(--s3) 0 0;
}

.page-about .ring-readout__item {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-quiet);
  opacity: 0.45;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .ring-readout__item b {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--c-gold-dark);
  margin-right: 8px;
}

.page-about .rhythm__figure:has(.ring-node--1:hover) .ring-readout__item--1,
.page-about .rhythm__figure:has(.ring-node--1:focus-visible) .ring-readout__item--1,
.page-about .rhythm__figure:has(.ring-node--2:hover) .ring-readout__item--2,
.page-about .rhythm__figure:has(.ring-node--2:focus-visible) .ring-readout__item--2,
.page-about .rhythm__figure:has(.ring-node--3:hover) .ring-readout__item--3,
.page-about .rhythm__figure:has(.ring-node--3:focus-visible) .ring-readout__item--3,
.page-about .rhythm__figure:has(.ring-node--4:hover) .ring-readout__item--4,
.page-about .rhythm__figure:has(.ring-node--4:focus-visible) .ring-readout__item--4 {
  opacity: 1;
  color: var(--text);
}

.page-about .rhythm__defs {
  margin: var(--s4) 0 0;
  padding: var(--s3) 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  gap: var(--s2);
}

.page-about .rhythm__def {
  display: grid;
  gap: 4px;
}

.page-about .rhythm__def dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gold-dark);
}

.page-about .rhythm__def dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 版本与适配 ---------- */
.page-about .versions__grid {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s4);
}

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

.page-about .figure-band {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: var(--s3) 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3);
}

.page-about .figure-band__item {
  position: relative;
  padding-left: 14px;
}

.page-about .figure-band__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold-dark), transparent);
}

.page-about .figure-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--c-gold);
}

.page-about .figure-band__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-quiet);
}

/* ---------- 结算与咨询受理 ---------- */
.page-about .service-grid {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s4);
}

.page-about .service-panel {
  border-radius: 16px 4px 16px 4px;
}

.page-about .service-panel__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
  margin: 0 0 var(--s3);
  color: var(--c-ivory);
}

.page-about .service-panel__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0 0 var(--s2);
}

.page-about .service-panel__note {
  margin: var(--s3) 0 0;
  padding-top: var(--s2);
  border-top: 1px solid var(--about-line-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-quiet);
}

.page-about .service-contact {
  margin: var(--s3) 0 0;
  display: grid;
  gap: var(--s2);
}

.page-about .service-contact__row {
  display: grid;
  gap: 4px;
}

.page-about .service-contact__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gold-dark);
}

.page-about .service-contact__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  word-break: break-word;
}

.page-about .about-service__figure {
  margin: var(--s5) 0 0;
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next-wrap {
  padding-block: clamp(48px, 7vw, 88px);
}

.page-about .about-next {
  list-style: none;
  margin: var(--s3) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__item {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: var(--s3) 0;
  text-decoration: none;
  transition: padding-left 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  padding-left: var(--s2);
  background: linear-gradient(90deg, rgba(216, 182, 92, 0.07), transparent 70%);
}

.page-about .about-next__k {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--c-ivory);
  transition: color 0.25s var(--ease);
}

.page-about .about-next__link:hover .about-next__k,
.page-about .about-next__link:focus-visible .about-next__k {
  color: var(--c-gold);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .figure-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__actions {
    gap: var(--s3);
  }

  .page-about .about-next__link {
    grid-template-columns: minmax(140px, 0.28fr) minmax(0, 1fr);
    align-items: baseline;
    gap: var(--s3);
  }
}

@media (min-width: 780px) {
  .page-about .lines-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--s3) var(--s3);
  }

  .page-about .line-card--a { grid-column: 1 / span 6; }
  .page-about .line-card--b { grid-column: 8 / span 5; margin-top: 46px; }
  .page-about .line-card--c { grid-column: 2 / span 4; }
  .page-about .line-card--d { grid-column: 7 / span 6; margin-top: 24px; }

  .page-about .service-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--s4);
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: 56px;
  }

  .page-about .timeline__item:nth-child(even)::before {
    left: -90px;
  }

  .page-about .timeline {
    padding-left: 36px;
  }

  .page-about .timeline__item::before {
    left: -42px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(280px, 4fr);
    gap: var(--s5);
    align-items: start;
  }

  .page-about .rhythm__grid {
    grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
    gap: var(--s5);
    align-items: center;
  }

  .page-about .versions__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    gap: var(--s5);
    align-items: center;
  }
}
<<<END>>>