.page-about {
  --about-maxw: 1180px;
  --about-pad: clamp(16px, 4vw, 40px);
  --about-gap: clamp(48px, 7vw, 96px);
  background: var(--ink-0);
  color: var(--fog);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .about-inner {
  width: 100%;
  max-width: var(--about-maxw);
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(28px, 4vw, 48px) clamp(48px, 7vw, 88px);
  background:
    radial-gradient(115% 85% at 92% -12%, rgba(123, 92, 255, 0.34), transparent 62%),
    radial-gradient(70% 60% at 4% 108%, rgba(53, 224, 208, 0.14), transparent 66%),
    var(--ink-0);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -18% -34% 42%;
  height: 62%;
  z-index: -1;
  background: linear-gradient(118deg, rgba(123, 92, 255, 0.24), rgba(21, 16, 46, 0.92));
  transform: skewY(-8deg);
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(28px, 4vw, 44px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .about-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 17ch;
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(34px, 7vw, 82px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-hero__accent {
  display: inline;
  background: linear-gradient(96deg, var(--violet) 8%, var(--cyan) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 52ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.82);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px clamp(16px, 3vw, 32px);
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metrics__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1;
  color: var(--fog);
}

.page-about .about-metrics__unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--slate);
}

.page-about .about-metrics__label {
  flex-basis: 100%;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

/* ---------- 分屏 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(40px, 6vw, 64px);
  max-width: var(--about-maxw);
  margin-inline: auto;
  padding: clamp(48px, 7vw, 96px) var(--about-pad) 0;
}

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

.page-about .about-block + .about-block {
  margin-top: var(--about-gap);
}

.page-about .about-h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(26px, 3.8vw, 42px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--fog);
}

.page-about .about-h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-block p,
.page-about .about-band__text p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 238, 249, 0.78);
}

.page-about .about-lead {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: clamp(16px, 1.8vw, 17px);
  line-height: 1.82;
  color: rgba(232, 238, 249, 0.8);
}

.page-about .about-lead--closing {
  margin-top: clamp(32px, 4.5vw, 52px);
  padding-left: 18px;
  border-left: 2px solid var(--violet);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-1);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--violet), rgba(53, 224, 208, 0.55), transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.5vw, 34px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, 0.1);
}

.page-about .about-timeline__item:nth-child(4)::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 181, 71, 0.12);
}

.page-about .about-timeline__step {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .about-timeline__item p:not(.about-timeline__step) {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.74);
}

/* ---------- 右侧固定索引 ---------- */

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

.page-about .about-rail {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(13, 21, 38, 0.92), rgba(7, 11, 20, 0.6));
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.page-about .about-rail__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: rail;
}

.page-about .about-rail__list li {
  counter-increment: rail;
  border-bottom: 1px solid rgba(30, 43, 66, 0.7);
}

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

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(232, 238, 249, 0.76);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.page-about .about-rail__list a::before {
  content: "0" counter(rail);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  opacity: 0.75;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--fog);
  transform: translateX(3px);
}

.page-about .about-rail__map {
  display: block;
  width: 100%;
  max-width: 130px;
  height: auto;
  margin: 18px auto 0;
  opacity: 0.9;
}

.page-about .about-rail__note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__note-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-rail__note-text {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate);
}

/* ---------- 通栏段落区 ---------- */

.page-about .about-band {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-band--tint {
  background: linear-gradient(180deg, var(--ink-1), rgba(7, 11, 20, 0.2));
  border-block: 1px solid rgba(30, 43, 66, 0.7);
}

.page-about .about-band__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

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

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

.page-about .about-roles {
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles__item {
  padding: 18px 0 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-roles__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.72);
}

/* ---------- 覆盖数字 ---------- */

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.5vw, 26px);
  background: var(--ink-1);
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-figures__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 选择理由 ---------- */

.page-about .about-reasons {
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reasons__item {
  display: grid;
  gap: 8px;
  padding: 22px 0 24px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-reasons__item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-reasons__index {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--violet);
}

.page-about .about-reasons__item p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.74);
}

/* ---------- 品牌原则 ---------- */

.page-about .about-principles {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-principle {
  position: relative;
  padding: 24px 22px 26px;
  border-radius: var(--radius);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(123, 92, 255, 0.16), transparent 70%),
    rgba(13, 21, 38, 0.7);
}

.page-about .about-principle p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.74);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  position: relative;
  margin-top: clamp(40px, 6vw, 80px);
  padding-block: clamp(40px, 6vw, 72px);
  overflow: hidden;
  background:
    radial-gradient(90% 120% at 90% 0%, rgba(53, 224, 208, 0.18), transparent 62%),
    linear-gradient(120deg, var(--ink-2), var(--ink-1) 70%);
  border-top: 1px solid var(--line);
}

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

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(28px, 4.6vw, 52px);
  line-height: 1.16;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(232, 238, 249, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .about-cta__actions .btn {
  min-width: 0;
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-band__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-reasons__item {
    grid-template-columns: 72px minmax(0, 1fr);
    align-items: start;
    gap: 0 20px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-split__rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    transform: none;
  }
}
<<<END>>>