.page-about {
  --about-rule: 2px solid var(--ink-700);
  --about-pad: clamp(20px, 4vw, 40px);
  background: var(--ink-900);
  color: var(--ice);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding-block: clamp(40px, 7vw, 88px) clamp(56px, 9vw, 120px);
  border-bottom: var(--line) solid var(--ink-700);
  background:
    radial-gradient(120% 130% at 88% 6%, rgba(40, 225, 255, 0.16), transparent 58%),
    var(--ink-900);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(104deg, var(--ink-900) 28%, rgba(5, 11, 31, 0.6) 62%, rgba(5, 11, 31, 0.1));
}

.page-about .about-hero__wedge {
  position: absolute;
  right: -8%;
  bottom: -26%;
  width: 44%;
  height: 70%;
  z-index: 0;
  transform: skewX(-14deg);
  background: linear-gradient(140deg, rgba(255, 123, 46, 0.5), rgba(255, 79, 163, 0.16) 68%, transparent);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
}

.page-about .about-hero__crumb {
  margin-bottom: 26px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.4vw, 94px);
  line-height: 0.96;
  letter-spacing: 0.005em;
  color: var(--ice);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 62ch;
  color: rgba(234, 242, 255, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__meta {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ink-700);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ============ 骨架：索引 + 正文 ============ */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  padding-block: clamp(48px, 7vw, 100px) clamp(72px, 10vw, 140px);
}

.page-about .about-index {
  border-top: var(--about-rule);
  padding-top: 14px;
}

.page-about .about-index__head {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--mist-dim);
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  color: var(--ice);
  font-size: 0.84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-about .about-index__list a .mono {
  color: var(--cyan);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

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

.page-about .about-sec {
  scroll-margin-top: calc(var(--ticker-h) + 28px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.5vw, 30px);
  padding-top: clamp(30px, 4.5vw, 54px);
  border-top: var(--about-rule);
}

.page-about .about-sec + .about-sec,
.page-about .about-band + .about-sec,
.page-about .about-sec + .about-band {
  margin-top: clamp(48px, 7vw, 96px);
}

.page-about .sec-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(52px, 10vw, 108px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: rgba(143, 163, 196, 0.16);
}

.page-about .about-sec__aside .sec-kicker {
  margin: 10px 0 0;
}

.page-about .sec-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.12;
  color: var(--ice);
}

.page-about .about-sec__main p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 0.98rem;
  line-height: 1.9;
  color: rgba(234, 242, 255, 0.8);
}

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

.page-about .about-linkline {
  margin-top: 22px !important;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-size: 0.9rem !important;
  color: var(--mist) !important;
}

/* ============ 01 数据条 ============ */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--ink-700);
  border: var(--about-rule);
}

.page-about .about-stat {
  background: var(--ink-800);
  padding: 16px 14px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--mist);
}

/* ============ 02 栏目清单 ============ */
.page-about .about-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-list__item {
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--ink-700);
  transition: border-color 0.18s ease;
}

.page-about .about-list__item:hover {
  border-left-color: var(--cyan);
}

.page-about .about-list__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .about-list__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ============ 过渡图带 ============ */
.page-about .about-band {
  border-top: var(--about-rule);
  padding-top: clamp(30px, 4.5vw, 54px);
}

/* ============ 03 团队 ============ */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  margin: 26px 0 0;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-role {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ink-700);
  font-size: 0.92rem;
}

.page-about .about-role__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.06rem;
  color: var(--orange);
}

.page-about .about-role__name {
  color: var(--ice);
  font-weight: 600;
  margin-right: 6px;
}

.page-about .about-role__desc {
  color: var(--mist);
  font-size: 0.86rem;
}

.page-about .about-note {
  margin: 16px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-flow {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-flow__step {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: var(--about-rule);
  background: var(--ink-800);
  font-size: 0.84rem;
  color: var(--ice);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-flow__step .mono {
  color: var(--cyan);
  font-size: 0.72rem;
}

.page-about .about-flow__step:hover {
  border-color: var(--cyan);
}

/* ============ 04 版本时间线 ============ */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.page-about .about-node {
  position: relative;
  padding-left: 34px;
}

.page-about .about-node + .about-node {
  margin-top: 12px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 17px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--ink-900);
}

.page-about .about-node details {
  border: var(--about-rule);
  background: var(--ink-800);
  transition: border-color 0.18s ease;
}

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

.page-about .about-node summary,
.page-about .about-pledge summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node summary::-webkit-details-marker,
.page-about .about-pledge summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__ver {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.32rem;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-about .about-node__title {
  font-size: 0.95rem;
  color: var(--ice);
}

.page-about .about-node__mark {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--mist);
}

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

.page-about details[open] .about-node__mark::after {
  content: "−";
  color: var(--cyan);
}

.page-about .about-node p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-node summary:hover {
  background: var(--ink-700);
}

/* ============ 05 公开信息 ============ */
.page-about .about-contact {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border: var(--about-rule);
  background: var(--ink-800);
}

.page-about .about-contact__label {
  min-width: 46px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--mist-dim);
}

.page-about .about-contact__value {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--ice);
  word-break: break-all;
}

.page-about .about-contact__value--text {
  font-family: var(--font-body);
  word-break: break-word;
}

/* ============ 06 服务承诺 ============ */
.page-about .about-pledge {
  display: block;
  margin-top: 12px;
  border: var(--about-rule);
  background: var(--ink-800);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-pledge:first-of-type {
  margin-top: 26px;
}

.page-about .about-pledge:nth-of-type(2) {
  margin-left: clamp(0px, 3vw, 36px);
}

.page-about .about-pledge:hover {
  border-color: var(--cyan);
  transform: translateX(2px);
}

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

.page-about .about-pledge__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.24rem;
  color: var(--orange);
}

.page-about .about-pledge__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  letter-spacing: 0.03em;
  color: var(--ice);
}

.page-about .about-pledge p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ============ 收束 ============ */
.page-about .about-next {
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: var(--about-rule);
  display: grid;
  gap: 18px;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(234, 242, 255, 0.82);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 焦点与动效 ============ */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
  .page-about .about-index__list a:hover,
  .page-about .about-pledge:hover {
    transform: none;
  }
}

/* ============ 窄屏微调 ============ */
@media (max-width: 560px) {
  .page-about .about-hero__wedge {
    width: 62%;
    height: 52%;
    opacity: 0.42;
  }
  .page-about .about-contact__row {
    gap: 8px;
  }
  .page-about .about-pledge:nth-of-type(2) {
    margin-left: 0;
  }
}

/* ============ 中等屏：内部分栏 ============ */
@media (min-width: 760px) {
  .page-about .about-sec {
    grid-template-columns: minmax(92px, 3fr) minmax(0, 9fr);
    gap: clamp(20px, 3vw, 40px);
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 28px;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

/* ============ 宽屏：索引轨道常驻 ============ */
@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--ticker-h) + 26px);
    align-self: start;
    max-height: calc(100vh - var(--ticker-h) - 52px);
    overflow: auto;
  }
  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index__list a {
    width: 100%;
    border-color: transparent;
    border-left: 3px solid var(--ink-700);
    background: transparent;
    padding: 8px 10px;
  }
  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--cyan);
    background: var(--ink-800);
    transform: none;
  }
  .page-about .about-sec__aside {
    position: sticky;
    top: calc(var(--ticker-h) + 26px);
    align-self: start;
  }
}
<<<END>>>