.page-about {
  --about-rail: 236px;
  --about-gap: clamp(16px, 2.4vw, 24px);
  --about-ink-soft: rgba(22, 61, 50, 0.55);
  background:
    radial-gradient(circle at 84% -6%, rgba(77, 255, 210, 0.12), transparent 46%),
    radial-gradient(circle at 0% 42%, rgba(58, 23, 34, 0.55), transparent 52%),
    var(--ink);
  color: var(--bone);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about a {
  color: inherit;
}

.page-about .about-topbar,
.page-about .about-hero,
.page-about .about-section {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--edge);
}

/* 顶部上下文条 */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-topbar__pill {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(20px, 3.6vw, 40px);
  padding-bottom: clamp(36px, 6vw, 68px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(34px, 8.4vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.015em;
}

.page-about .about-hero__mark {
  display: block;
  margin-top: 6px;
  color: var(--cyan);
  text-shadow: 0 0 34px rgba(77, 255, 210, 0.28);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 侧栏目录 */
.page-about .about-hero__rail {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-rail__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist);
  background: rgba(8, 17, 15, 0.6);
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* 首屏图 */
.page-about .about-hero__figure {
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .hth-figure__media {
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--turf), var(--ink));
}

.page-about .hth-figure__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.82);
}

.page-about .hth-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 章节通用 */
.page-about .about-section {
  padding-block: clamp(44px, 6.4vw, 84px);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-head .hth-section__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .about-head .hth-section__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-dim);
}

/* 主客场标签卡 */
.page-about .about-labels {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-label {
  padding: 24px 22px 26px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--turf), var(--moss));
}

.page-about .about-label h3 {
  margin: 16px 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
  font-weight: 600;
}

.page-about .about-label p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-label--home {
  border-left: 3px solid var(--cyan);
}

.page-about .about-label--away {
  border-left: 3px solid var(--violet);
  background: linear-gradient(165deg, var(--violet), var(--moss));
}

.page-about .about-label--key {
  position: relative;
  border-left: 3px solid var(--orange);
  background: linear-gradient(165deg, var(--turf), var(--ink));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  padding-bottom: 34px;
}

.page-about .about-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 60ch;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 三步 */
.page-about .about-steps {
  display: grid;
  gap: var(--about-gap);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-step {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  padding: 22px 22px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(22, 61, 50, 0.92), rgba(8, 17, 15, 0.94));
}

.page-about .about-step:nth-child(2) {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  padding-bottom: 32px;
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 8vw, 64px);
  line-height: 0.92;
  font-weight: 700;
  color: var(--cyan);
  opacity: 0.92;
}

.page-about .about-step__body h3 {
  margin: 6px 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
}

.page-about .about-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-step__meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan-dim);
}

.page-about .about-steps__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

/* 速度面板 */
.page-about .about-speed__panel {
  padding: clamp(26px, 4vw, 48px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 92% 8%, rgba(77, 255, 210, 0.18), transparent 52%),
    linear-gradient(140deg, var(--moss), var(--violet) 78%);
}

.page-about .about-speed__eyebrow {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-speed__title {
  margin: 12px 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  max-width: 22ch;
}

.page-about .about-speed__text {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-speed__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 26px 0 28px;
  padding: 0;
  list-style: none;
}

.page-about .about-speed__stats li {
  padding: 16px 18px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(8, 17, 15, 0.55);
}

.page-about .about-speed__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-speed__unit {
  margin-left: 4px;
  font-size: 14px;
  color: var(--bone);
}

.page-about .about-speed__stats em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* 成长路径 */
.page-about .about-path {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-path__item {
  padding: 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan-dim);
  background: var(--about-ink-soft);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-path__item:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .about-path__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-dim);
}

.page-about .about-path__item h3 {
  margin: 10px 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
}

.page-about .about-path__item p {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-path__link {
  display: inline-block;
  font-size: 13px;
  text-decoration: none;
  color: var(--cyan);
  border-bottom: 1px solid rgba(77, 255, 210, 0.4);
  padding-bottom: 2px;
}

.page-about .about-path__link:hover,
.page-about .about-path__link:focus-visible {
  color: var(--bone);
  border-color: var(--bone);
  outline: none;
}

.page-about .about-path__item--biz {
  border-top-color: var(--orange);
  background: linear-gradient(160deg, var(--wine), rgba(8, 17, 15, 0.9));
}

.page-about .about-path__item--biz .about-path__label {
  color: var(--orange);
}

.page-about .about-path__item--biz .about-path__link {
  color: var(--orange);
  border-color: rgba(255, 154, 77, 0.45);
}

/* 时间线 */
.page-about .about-time {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-time__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-time__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-time__item::before {
  content: "";
  position: absolute;
  left: calc(-22px - 5px);
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(77, 255, 210, 0.7);
}

.page-about .about-time__year {
  display: inline-block;
  margin-bottom: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(37, 32, 74, 0.7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--bone);
}

.page-about .about-time__item h3 {
  margin: 0 0 6px;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.4;
}

.page-about .about-time__item p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* 问答 */
.page-about .about-faq__list {
  display: grid;
  gap: 12px;
}

.page-about .about-faq__item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--about-ink-soft);
  padding: 2px 20px;
}

.page-about .about-faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 0;
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--bone);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-faq__item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-faq__item[open] {
  border-color: var(--cyan-dim);
}

.page-about .about-faq__item[open] summary::after {
  content: "−";
}

.page-about .about-faq__item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.page-about .about-faq__item p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-faq__more {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-faq__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 255, 210, 0.45);
}

.page-about .about-faq__more a:hover,
.page-about .about-faq__more a:focus-visible {
  color: var(--bone);
  border-color: var(--bone);
  outline: none;
}

/* 平板 */
@media (min-width: 640px) {
  .page-about .about-labels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-label--key {
    grid-column: span 2;
  }

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

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

/* 桌面 */
@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__rail {
    position: sticky;
    top: 96px;
    border-top: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    display: block;
    border-radius: var(--r-sm);
    white-space: normal;
  }

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

  .page-about .about-label--key {
    grid-column: span 1;
  }

  .page-about .about-step {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 10px 28px;
    padding: 28px 32px 30px;
    align-items: start;
  }

  .page-about .about-step:nth-child(2) {
    margin-left: 32px;
    padding-bottom: 40px;
  }

  .page-about .about-steps__figure {
    margin-left: 32px;
  }

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

  .page-about .about-time {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-time__list {
    padding-left: 28px;
  }

  .page-about .about-time__item::before {
    left: calc(-28px - 5px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-speed__panel {
    padding: clamp(36px, 3.4vw, 56px);
  }

  .page-about .about-faq__list {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-path__item,
  .page-about .about-rail__link {
    transition: none;
  }

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