.page-about {
  --about-line: rgba(247, 241, 228, .12);
  --about-cyan-line: rgba(62, 240, 216, .18);
  --about-gap: clamp(28px, 5vw, 56px);
  background:
    radial-gradient(90% 55% at 100% 0%, rgba(10, 27, 50, .85), transparent 70%),
    var(--ink);
  color: var(--cream);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 面包屑定位 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: clamp(10px, 2vw, 20px);
  padding: clamp(26px, 5vw, 54px) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(120% 85% at 88% 6%, rgba(62, 240, 216, .15), transparent 62%),
    radial-gradient(95% 75% at 0% 100%, rgba(255, 155, 81, .1), transparent 66%);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 7.6vw, 4.4rem);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-br {
  display: none;
}

.page-about .about-hero__aside .lede {
  margin: 0;
  max-width: 46ch;
  color: var(--mist);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-stat {
  background: rgba(8, 42, 36, .8);
  padding: 14px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  font-size: .6em;
  margin-left: 2px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--fog);
}

/* ---------- 分屏主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: var(--about-gap);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--fog);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  background: rgba(62, 240, 216, .08);
  border-color: rgba(62, 240, 216, .3);
}

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

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section h2 {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-section__intro {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

.page-about .about-prose {
  margin-top: clamp(16px, 2.6vw, 24px);
  max-width: 60ch;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-prose p:first-of-type {
  font-size: clamp(16px, 1.9vw, 18.5px);
  color: var(--cream);
}

/* ---------- 夜蓝区块 ---------- */
.page-about .about-section--night {
  margin-top: clamp(20px, 4vw, 34px);
  padding: clamp(22px, 4vw, 40px);
  border-top: 0;
  border: 1px solid var(--about-cyan-line);
  border-radius: var(--radius-xl);
  background: linear-gradient(155deg, rgba(30, 90, 80, .55), rgba(10, 27, 50, .94) 72%);
}

/* ---------- 团队条带 ---------- */
.page-about .about-split__bar {
  display: flex;
  gap: 4px;
  height: 10px;
  margin: clamp(18px, 3vw, 26px) 0 16px;
}

.page-about .about-split__seg {
  border-radius: var(--radius-pill);
  min-width: 0;
}

.page-about .about-split__seg--content {
  flex: 21;
  background: var(--cyan);
}

.page-about .about-split__seg--support {
  flex: 8;
  background: var(--amber);
}

.page-about .about-split__seg--product {
  flex: 17;
  background: var(--crimson);
}

.page-about .about-split {
  display: grid;
  gap: 10px;
}

.page-about .about-split__item {
  padding: 18px;
  background: rgba(8, 42, 36, .66);
  border: 1px solid rgba(62, 240, 216, .16);
  border-radius: var(--radius-lg);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-split__item--content {
  border-top: 3px solid rgba(62, 240, 216, .7);
}

.page-about .about-split__item--support {
  border-top: 3px solid rgba(255, 155, 81, .7);
}

.page-about .about-split__item--product {
  border-top: 3px solid rgba(193, 58, 82, .7);
}

.page-about .about-split__item:hover {
  transform: translateY(-3px);
  border-color: rgba(62, 240, 216, .45);
  background: rgba(12, 52, 45, .86);
}

.page-about .about-split__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-split__num span {
  font-size: .55em;
  margin-left: 3px;
  color: var(--fog);
}

.page-about .about-split__item h3 {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-split__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--fog);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  display: block;
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-figure--inset {
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-figure .image-frame__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 浅色面板 ---------- */
.page-about .about-panel--light {
  margin-top: clamp(20px, 4vw, 34px);
  padding: clamp(22px, 4vw, 44px);
  border-radius: var(--radius-xl);
  background: linear-gradient(160deg, var(--mist), #F0F6F3 88%);
  color: var(--ink);
}

.page-about .about-panel--light h2,
.page-about .about-panel--light h3 {
  color: var(--ink);
}

.page-about .about-panel--light .eyebrow {
  color: #2f6a5d;
}

.page-about .about-panel--light .about-panel__intro {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: #2c4a43;
}

.page-about .about-panel__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: #2c4a43;
}

.page-about .about-panel--light a {
  color: var(--stand);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-panel--light a:hover {
  color: #143f38;
}

/* ---------- 步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  counter-reset: step;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps > li {
  position: relative;
  counter-increment: step;
  padding-left: 44px;
}

.page-about .about-steps > li::before {
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 50%;
}

.page-about .about-steps h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: #2c4a43;
}

/* ---------- 家庭席位 ---------- */
.page-about .about-family {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(16px, 3vw, 26px);
}

.page-about .about-family__text p {
  margin: 0 0 1.05em;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-family__text p:first-of-type {
  color: var(--cream);
}

.page-about .about-family__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-family__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(30, 90, 80, .34);
  border: 1px solid var(--about-cyan-line);
  border-radius: var(--radius-md);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-family__list li:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 155, 81, .45);
}

.page-about .about-family__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-family__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-milestones {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 10px;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(255, 155, 81, .55) 58%, rgba(62, 240, 216, .06));
}

.page-about .about-milestones > li {
  position: relative;
  min-width: 0;
}

.page-about .about-node {
  position: absolute;
  left: -30px;
  top: 14px;
  color: var(--cyan);
}

.page-about .about-node--now {
  color: var(--amber);
}

.page-about .about-milestone {
  background: rgba(10, 27, 50, .6);
  border: 1px solid rgba(62, 240, 216, .14);
  border-radius: var(--radius-md);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-milestone:hover {
  transform: translateY(-2px);
  border-color: rgba(62, 240, 216, .42);
  background: rgba(14, 36, 62, .82);
}

.page-about .about-milestone--now {
  border-color: rgba(255, 155, 81, .38);
}

.page-about .about-milestone summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
}

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

.page-about .about-milestone__ver {
  flex: none;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
  background: var(--gold);
  border-radius: var(--radius-pill);
  font-variant-numeric: tabular-nums;
}

.page-about .about-milestone__ver--now {
  background: var(--amber);
}

.page-about .about-milestone__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-milestone__more {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--fog);
}

.page-about .about-milestone__more::after {
  content: "展开 +";
}

.page-about .about-milestone[open] .about-milestone__more::after {
  content: "收起 −";
}

.page-about .about-milestone__body {
  padding: 12px 16px 16px;
  border-top: 1px solid rgba(62, 240, 216, .12);
}

.page-about .about-milestone__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 三项坚持 ---------- */
.page-about .about-values {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-values article {
  padding: 20px;
  background: rgba(255, 255, 255, .62);
  border: 1px solid rgba(8, 42, 36, .12);
  border-radius: var(--radius-lg);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-values article:hover {
  transform: translateY(-3px);
  border-color: rgba(8, 42, 36, .28);
}

.page-about .about-values h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 800;
}

.page-about .about-values p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #2c4a43;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(24px, 5vw, 48px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 155, 81, .26);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(255, 155, 81, .22), transparent 62%),
    linear-gradient(150deg, #0B3830, var(--night) 82%);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-cta__note {
  font-size: 13.5px;
  color: var(--fog);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 240, 216, .38);
}

.page-about .about-cta__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 返回顶部 ---------- */
.page-about .about-top {
  display: inline-flex;
  margin-top: clamp(26px, 4vw, 40px);
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 187, 181, .42);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-family__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

  .page-about .about-br {
    display: inline;
  }

  .page-about .about-family {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 214px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-split__item,
  .page-about .about-milestone,
  .page-about .about-values article,
  .page-about .about-family__list li,
  .page-about .about-rail__link,
  .page-about .about-top {
    transition: none;
  }

  .page-about .about-split__item:hover,
  .page-about .about-milestone:hover,
  .page-about .about-values article:hover,
  .page-about .about-family__list li:hover {
    transform: none;
  }
}