.page-about {
  --about-pad: clamp(56px, 9vw, 132px);
  display: block;
  background:
    radial-gradient(120% 62% at 86% 0%, rgba(37, 244, 208, 0.10), transparent 58%),
    radial-gradient(90% 52% at -6% 38%, rgba(255, 107, 44, 0.07), transparent 54%),
    var(--ink);
  color: var(--silver);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(28px, 5vw, 72px));
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8vw, 5.6rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: clamp(10px, 2vw, 18px) 0 clamp(16px, 2.8vw, 26px);
}

.page-about .about-hero__accent {
  color: var(--cyan);
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  line-height: 1.78;
  color: var(--silver);
  max-width: 46ch;
  margin: 0 0 clamp(22px, 3.5vw, 34px);
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.875rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
}

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

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__figure.media-frame {
  border-radius: var(--r-xl);
  aspect-ratio: 16 / 9;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: end;
  }
  .page-about .about-hero__stats {
    border-left: 2px solid var(--line);
    padding-left: clamp(18px, 2.6vw, 32px);
  }
}

/* ---------- 章节索引条 ---------- */

.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(11, 18, 32, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: clamp(20px, 3.5vw, 40px);
}

.page-about .about-rail .chapter-rail__list {
  display: flex;
  gap: clamp(6px, 1vw, 10px);
  list-style: none;
  margin: 0;
  padding: clamp(10px, 1.4vw, 14px) 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail .chapter-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .chapter-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  min-height: 36px;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  color: var(--mist);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 240ms var(--ease), border-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-rail .chapter-rail__link:hover,
.page-about .about-rail .chapter-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--line);
}

.page-about .about-rail .chapter-rail__link.is-active {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4.4vw, 3rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 12px 0 clamp(16px, 2.6vw, 24px);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-origin__text p {
  max-width: 52ch;
  line-height: 1.8;
  color: var(--silver);
  margin: 0 0 1.1em;
}

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

.page-about .about-origin__figure.media-frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-origin__figure {
  position: relative;
  margin: 0;
}

.page-about .about-origin__figure::after {
  content: "";
  position: absolute;
  left: -6%;
  right: 34%;
  bottom: -20px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  clip-path: polygon(0 62%, 100% 0, 100% 38%, 0 100%);
  pointer-events: none;
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ---------- 02 谁在用 ---------- */

.page-about .about-aud__head {
  max-width: 58ch;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-aud__lead {
  color: var(--mist);
  line-height: 1.8;
  font-size: 1.0625rem;
  margin: 0;
}

.page-about .about-aud__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
  align-items: start;
}

.page-about .about-aud__card {
  padding: clamp(22px, 3vw, 34px);
}

.page-about .about-aud__card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.25;
  color: var(--white);
  margin: 10px 0 14px;
}

.page-about .about-aud__card p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--silver);
  margin: 0;
}

.page-about .about-aud__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-aud__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-aud__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .about-aud__link {
  display: inline-block;
  margin-top: 20px;
  color: var(--cyan);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(37, 244, 208, 0.4);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-aud__link:hover,
.page-about .about-aud__link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

@media (min-width: 960px) {
  .page-about .about-aud__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.4vw, 30px);
  }
  .page-about .about-aud__card:nth-child(2) {
    margin-top: clamp(28px, 4vw, 56px);
  }
  .page-about .about-aud__card:nth-child(3) {
    margin-top: clamp(56px, 8vw, 112px);
  }
}

/* ---------- 03 运营 ---------- */

.page-about .about-ops__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-ops__figure.media-frame {
  aspect-ratio: 16 / 9;
  margin: 0;
}

.page-about .about-ops__text p {
  max-width: 54ch;
  line-height: 1.8;
  color: var(--silver);
  margin: 0 0 1.1em;
}

.page-about .about-ops__steps {
  list-style: none;
  margin: 0 0 1.4em;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-ops__steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--silver);
}

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

.page-about .about-ops__num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--flame);
}

@media (min-width: 900px) {
  .page-about .about-ops__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
  }
}

/* ---------- 04 版本刻度 ---------- */

.page-about .about-tl__head {
  max-width: 52ch;
  margin-bottom: clamp(32px, 5vw, 60px);
}

.page-about .about-tl__lead {
  color: var(--mist);
  line-height: 1.8;
  font-size: 1.0625rem;
  margin: 0;
}

.page-about .about-tl__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(8px, 2vw, 24px);
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: clamp(26px, 4vw, 44px);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: -2px;
  width: 2px;
  transform: skewX(-8deg);
  transform-origin: top center;
  background: linear-gradient(180deg, rgba(37, 244, 208, 0.55), rgba(37, 244, 208, 0.1));
  pointer-events: none;
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: -6px;
  top: 1.15em;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-node {
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(16px, 2.2vw, 24px) clamp(18px, 2.6vw, 28px);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-node:hover {
  border-color: rgba(37, 244, 208, 0.42);
}

.page-about .about-node[open] {
  border-color: rgba(37, 244, 208, 0.42);
  background: var(--stand);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  list-style: none;
  cursor: pointer;
  min-height: 32px;
}

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

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--r-md);
}

.page-about .about-node__ver {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-node__body {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 05 团队 ---------- */

.page-about .about-team__head {
  max-width: 56ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-team__head p {
  color: var(--mist);
  line-height: 1.8;
  font-size: 1.0625rem;
  margin: 0;
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  padding: clamp(16px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-team__idx {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--flame);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-team__desc {
  grid-column: 1 / -1;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--silver);
}

@media (min-width: 760px) {
  .page-about .about-team__row {
    grid-template-columns: 3.25rem 8.5rem minmax(0, 1fr);
    gap: 18px;
    align-items: center;
  }
  .page-about .about-team__desc {
    grid-column: auto;
  }
}

/* ---------- 06 同行 ---------- */

.page-about .about-join__box {
  max-width: 62rem;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  padding: clamp(28px, 5vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(37, 244, 208, 0.13), transparent 58%),
    var(--stand);
}

.page-about .about-join__box .about-h2 {
  margin: 6px 0 0;
}

.page-about .about-join__box p {
  max-width: 56ch;
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}