.page-about {
  --about-tint-a: rgba(79, 107, 90, 0.16);
  --about-tint-b: rgba(110, 115, 120, 0.16);
  --about-tint-c: rgba(240, 237, 230, 0.05);
  --about-rail: 224px;
  --about-pad: clamp(20px, 3vw, 44px);
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(18px, 3vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  font-size: clamp(2.35rem, 6.6vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  margin: 10px 0 0;
  color: var(--yh-cream);
}

.page-about .about-hero__intro {
  max-width: 58ch;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  font-size: clamp(0.95rem, 1.2vw, 1.0625rem);
  line-height: 1.95;
  color: var(--yh-silver);
}

.page-about .about-facts {
  margin: 0;
  border-top: 1px solid var(--yh-line);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--yh-line-dash);
}

.page-about .about-facts dt {
  flex: 0 0 auto;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: rgba(154, 166, 178, 0.82);
}

.page-about .about-facts dd {
  margin: 0;
  text-align: right;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--yh-cream);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 80px);
  }
}

/* ---------- 档案骨架 ---------- */
.page-about .about-arch {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
  margin-top: clamp(30px, 5vw, 72px);
  padding-bottom: clamp(40px, 7vw, 96px);
}

@media (min-width: 1000px) {
  .page-about .about-arch {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
  }
}

.page-about .about-arch__rail {
  position: relative;
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--yh-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.26em;
  color: var(--yh-gold);
}

.page-about .about-toc .yh-index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .yh-index__item {
  flex: 0 0 auto;
}

.page-about .about-toc .yh-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--yh-line);
  border-radius: var(--yh-radius-pill);
  white-space: nowrap;
  font-size: 0.8125rem;
  color: var(--yh-silver);
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-toc .yh-index__num {
  font-family: var(--yh-font-mono);
  font-size: 0.6875rem;
  color: var(--yh-gold);
}

.page-about .about-toc .yh-index__link:hover,
.page-about .about-toc .yh-index__link:focus-visible {
  border-color: rgba(47, 230, 216, 0.6);
  color: var(--yh-cream);
}

.page-about .about-toc .yh-index__link:focus-visible {
  outline: 2px solid var(--yh-violet);
  outline-offset: 2px;
}

.page-about .about-toc .yh-index__link.is-active,
.page-about .about-toc .yh-index__link[aria-current="true"] {
  border-color: rgba(47, 230, 216, 0.7);
  background: rgba(47, 230, 216, 0.08);
  color: var(--yh-cream);
}

@media (min-width: 1000px) {
  .page-about .about-arch__rail {
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .about-toc .yh-index {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--yh-line);
  }

  .page-about .about-toc .yh-index__item + .yh-index__item {
    margin-top: 2px;
  }

  .page-about .about-toc .yh-index__link {
    display: flex;
    width: 100%;
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    background: transparent;
    font-size: 0.875rem;
  }

  .page-about .about-toc .yh-index__link:hover {
    border-color: transparent;
    border-left-color: rgba(47, 230, 216, 0.5);
    background: transparent;
  }

  .page-about .about-toc .yh-index__link.is-active,
  .page-about .about-toc .yh-index__link[aria-current="true"] {
    border-left-color: var(--yh-cyan);
    background: linear-gradient(90deg, rgba(47, 230, 216, 0.1), transparent 78%);
  }
}

.page-about .about-arch__flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: var(--about-pad);
  border-radius: clamp(22px, 3vw, 40px);
  scroll-margin-top: 120px;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(18px, 2.6vw, 36px);
}

.page-about .about-chapter--tint-a {
  background: linear-gradient(170deg, var(--about-tint-a), rgba(11, 27, 43, 0.14) 72%);
}

.page-about .about-chapter--tint-b {
  background: linear-gradient(170deg, var(--about-tint-b), rgba(11, 27, 43, 0.1) 72%);
}

.page-about .about-chapter--cream {
  background: linear-gradient(170deg, var(--about-tint-c), rgba(11, 27, 43, 0.16) 76%);
}

.page-about .about-chapter--dark {
  background: linear-gradient(170deg, #07121E, rgba(18, 42, 64, 0.55) 70%, rgba(11, 27, 43, 0.9));
  border: 1px solid var(--yh-line);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 1.8vw, 22px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--yh-line);
  margin-bottom: clamp(16px, 2.6vw, 30px);
}

.page-about .about-chapter__index {
  flex: 0 0 auto;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--yh-gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--yh-font-display);
  font-size: clamp(1.35rem, 3vw, 2rem);
  line-height: 1.24;
  letter-spacing: 0.03em;
  color: var(--yh-cream);
}

.page-about .about-chapter__lede {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 2.6vw, 30px);
  font-size: 0.9375rem;
  line-height: 1.92;
  color: var(--yh-silver);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 42px);
  align-items: start;
}

.page-about .about-chapter__main p {
  margin: 0 0 1.05em;
  font-size: 0.9375rem;
  line-height: 1.95;
  color: var(--yh-silver);
}

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

.page-about .about-chapter__main strong {
  color: var(--yh-cream);
  font-weight: 600;
}

.page-about .about-chapter__main a,
.page-about .about-timeline__body a {
  color: var(--yh-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 230, 216, 0.38);
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .about-chapter__main a:hover,
.page-about .about-timeline__body a:hover {
  border-bottom-color: var(--yh-cyan);
  color: #7ff3ea;
}

.page-about .about-chapter__main a:focus-visible,
.page-about .about-timeline__body a:focus-visible {
  outline: 2px solid var(--yh-violet);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (min-width: 880px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-chapter__grid--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-chapter__main {
    padding-left: clamp(0px, 2vw, 34px);
  }
}

/* ---------- 边界清单 ---------- */
.page-about .about-scope {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--yh-line);
}

.page-about .about-scope li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--yh-line-dash);
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--yh-silver);
}

.page-about .about-scope__key {
  font-family: var(--yh-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--yh-clay);
}

@media (min-width: 620px) {
  .page-about .about-scope li {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .about-inline-note {
  margin-top: clamp(16px, 2vw, 24px);
  padding-left: 14px;
  border-left: 2px solid rgba(214, 168, 75, 0.6);
  font-size: 0.8125rem !important;
  line-height: 1.85 !important;
  color: rgba(154, 166, 178, 0.9) !important;
}

.page-about .about-closing {
  margin-top: clamp(14px, 2vw, 22px) !important;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 24px);
  border-radius: var(--yh-radius-md);
  background: rgba(123, 77, 255, 0.1);
  border: 1px solid rgba(123, 77, 255, 0.28);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .yh-media {
  border-radius: var(--yh-radius-md);
  overflow: hidden;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--yh-line-strong);
  font-size: 0.75rem;
  line-height: 1.75;
  color: rgba(154, 166, 178, 0.76);
}

.page-about .about-versions__figure {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
}

.page-about .about-versions__figure .yh-media {
  border-radius: var(--yh-radius-md);
  overflow: hidden;
}

/* ---------- 流程图 ---------- */
.page-about .about-flowwrap {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
  padding: clamp(10px, 1.6vw, 20px) clamp(6px, 1.2vw, 16px);
  border-radius: var(--yh-radius-md);
  background: linear-gradient(180deg, rgba(7, 18, 30, 0.72), rgba(11, 27, 43, 0.3));
  border: 1px solid var(--yh-line);
}

.page-about .about-flow {
  display: block;
  width: 100%;
  height: auto;
  min-height: 150px;
}

.page-about .about-flow__ring {
  fill: rgba(7, 18, 30, 0.92);
  stroke: rgba(47, 230, 216, 0.55);
  stroke-width: 1.5;
}

.page-about .about-flow__item--mid .about-flow__ring {
  stroke: rgba(123, 77, 255, 0.72);
}

.page-about .about-flow__item--end .about-flow__ring {
  stroke: rgba(214, 168, 75, 0.78);
}

.page-about .about-flow__num {
  font-family: var(--yh-font-mono);
  font-size: 15px;
  fill: #D6A84B;
}

.page-about .about-flow__label {
  font-family: var(--yh-font-display);
  font-size: 15px;
  letter-spacing: 0.08em;
  fill: #F0EDE6;
}

/* ---------- 校订步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .about-step {
  position: relative;
  padding: 0 0 clamp(14px, 2vw, 22px) 26px;
  border-left: 1px solid var(--yh-line);
}

.page-about .about-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--yh-ink);
  box-shadow: inset 0 0 0 2px rgba(47, 230, 216, 0.8);
}

.page-about .about-step__name {
  margin: 0 0 6px;
  font-family: var(--yh-font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.06em;
  color: var(--yh-cream);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--yh-silver);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--yh-line);
  border-radius: var(--yh-radius-md);
  overflow: hidden;
}

.page-about .about-role {
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(7, 18, 30, 0.74);
  transition: background-color 0.28s ease;
}

.page-about .about-role:hover {
  background: rgba(18, 42, 64, 0.86);
}

.page-about .about-role__count {
  display: block;
  font-size: clamp(2.1rem, 4.6vw, 3rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--yh-cream);
}

.page-about .about-role__name {
  margin: 12px 0 8px;
  font-family: var(--yh-font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--yh-cyan);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--yh-silver);
}

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

.page-about .about-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: clamp(14px, 2vw, 18px) clamp(16px, 2.2vw, 22px);
  border-left: 2px solid var(--yh-clay);
  border-radius: 0 var(--yh-radius-sm) var(--yh-radius-sm) 0;
  background: rgba(178, 106, 78, 0.1);
  font-size: 0.8125rem;
  line-height: 1.88;
  color: var(--yh-silver);
}

/* ---------- 版本号 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(10px, 1.6vw, 16px);
}

.page-about .about-version {
  padding: clamp(14px, 2vw, 20px);
  border-radius: var(--yh-radius-md);
  border: 1px solid var(--yh-line);
  background: rgba(11, 27, 43, 0.5);
  transition: border-color 0.28s ease, transform 0.28s ease;
}

.page-about .about-version:hover {
  border-color: rgba(47, 230, 216, 0.55);
  transform: translateY(-2px);
}

.page-about .about-version__label {
  display: block;
  font-family: var(--yh-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: rgba(154, 166, 178, 0.85);
}

.page-about .about-version__value {
  display: block;
  margin: 8px 0 10px;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--yh-gold);
}

.page-about .about-version__hint {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--yh-silver);
}

@media (min-width: 780px) {
  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0 16px 22px;
  border-left: 1px solid var(--yh-line-strong);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--yh-gold);
  box-shadow: 0 0 0 4px rgba(214, 168, 75, 0.16);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
}

.page-about .about-timeline__year {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--yh-gold);
}

.page-about .about-timeline__name {
  margin: 0 0 6px;
  font-family: var(--yh-font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.05em;
  color: var(--yh-cream);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--yh-silver);
}

@media (min-width: 640px) {
  .page-about .about-timeline__item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding-left: 26px;
  }
}

/* ---------- 侧栏备注 ---------- */
.page-about .about-aside {
  padding: clamp(16px, 2.2vw, 24px);
  border-radius: var(--yh-radius-md);
  background: rgba(7, 18, 30, 0.66);
  border: 1px solid var(--yh-line);
}

.page-about .about-aside__title {
  margin: 0 0 12px;
  font-family: var(--yh-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  color: var(--yh-gold);
}

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

.page-about .about-aside__list li {
  position: relative;
  padding: 0 0 10px 14px;
  font-size: 0.8125rem;
  line-height: 1.82;
  color: rgba(154, 166, 178, 0.92);
}

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

.page-about .about-aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--yh-moss);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__title {
    font-size: clamp(2rem, 9vw, 2.6rem);
  }

  .page-about .about-facts__row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-facts dd {
    text-align: left;
  }

  .page-about .about-flow {
    min-height: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-role,
  .page-about .about-toc .yh-index__link {
    transition: none;
  }

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