.page-about {
  --about-gap: clamp(2.25rem, 5.5vw, 4.5rem);
  --about-side-pad: clamp(1.15rem, 4vw, 3.25rem);
  --about-track: rgba(230, 241, 245, .12);
  --about-track-strong: rgba(57, 255, 136, .46);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: clamp(1rem, 2vw, 1.5rem);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .5rem;
  color: rgba(143, 163, 173, .5);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(1rem, 3vw, 2rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
  background:
    radial-gradient(120% 80% at 88% 8%, rgba(57, 255, 136, .07) 0%, rgba(57, 255, 136, 0) 55%),
    radial-gradient(90% 70% at 0% 90%, rgba(0, 229, 255, .05) 0%, rgba(0, 229, 255, 0) 60%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(230, 241, 245, .045) 0 1px,
    transparent 1px 72px
  );
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 85%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 85%);
}

.page-about .about-hero > .wrap {
  position: relative;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: .85rem;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(2.1rem, 7vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--white);
  margin: 0 0 1.25rem;
  max-width: 20ch;
}

.page-about .about-hero__lead .lede {
  max-width: 48ch;
  color: rgba(230, 241, 245, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

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

.page-about .about-hero__media .media__inner {
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-hero__media .media__inner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06);
}

.page-about .about-hero__media .media__caption {
  margin-top: .85rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 44ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: clamp(.9rem, 2.4vw, 1.4rem) clamp(1rem, 2.6vw, 1.6rem);
  background: var(--ink);
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 2.05rem);
  font-weight: 500;
  color: var(--green);
  letter-spacing: -.015em;
  line-height: 1;
}

.page-about .about-hero__stats .stat__label {
  font-size: .78rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-section-head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-section-head .eyebrow {
  margin-bottom: .7rem;
}

.page-about .about-section-head .title-lg {
  margin-bottom: 1rem;
}

.page-about .about-section-head .lede {
  color: rgba(230, 241, 245, .78);
}

.page-about .title-lg {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(1.6rem, 4.2vw, 2.75rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0;
}

.page-about .title-md {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.05rem, 2.5vw, 1.4rem);
  line-height: 1.3;
  color: var(--white);
  margin: 0 0 .6rem;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-origin__intro p {
  color: rgba(230, 241, 245, .78);
}

.page-about .about-origin__intro .lede {
  color: rgba(230, 241, 245, .92);
  margin-bottom: 1.1rem;
}

.page-about .about-origin__points {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-origin__point {
  padding: clamp(1.25rem, 3vw, 1.9rem);
  margin: 0;
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--line);
  background: var(--glass-blue);
  backdrop-filter: blur(6px);
  transition: background .25s ease, box-shadow .25s ease;
}

.page-about .about-origin__point:hover {
  background: rgba(15, 42, 51, .78);
  box-shadow: inset 3px 0 0 var(--green);
}

.page-about .about-origin__point .tag {
  display: inline-block;
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: .75rem;
}

.page-about .about-origin__point p {
  margin: 0;
  color: rgba(230, 241, 245, .76);
}

/* ---------- 场馆信息 ---------- */
.page-about .about-venues__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-venues__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-venues__media .media__caption {
  padding: .9rem clamp(1rem, 2.4vw, 1.4rem) 1.1rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-venues__panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-venues__panel {
  padding: clamp(1.2rem, 3vw, 1.75rem);
  border: 1px solid var(--line);
  background: var(--ink-2);
  position: relative;
  transition: border-color .25s ease, transform .3s ease;
}

.page-about .about-venues__panel::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--green), rgba(57, 255, 136, 0));
  opacity: 0;
  transition: opacity .25s ease;
}

.page-about .about-venues__panel:hover {
  border-color: rgba(57, 255, 136, .38);
  transform: translateX(4px);
}

.page-about .about-venues__panel:hover::after {
  opacity: 1;
}

.page-about .about-venues__panel .eyebrow {
  margin-bottom: .5rem;
  font-size: .68rem;
  color: var(--blue);
}

.page-about .about-venues__panel p:last-child {
  margin: 0;
  color: rgba(230, 241, 245, .76);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5.5rem;
  top: .55rem;
  bottom: .55rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(57, 255, 136, .55), var(--about-track) 45%, var(--about-track));
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: clamp(1.5rem, 4vw, 2.4rem);
  position: relative;
}

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

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--mist);
  padding-top: .35rem;
  text-align: right;
  position: relative;
}

.page-about .about-timeline__year::after {
  content: "";
  position: absolute;
  right: -0.34rem;
  top: .62rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--about-track-strong);
  transform: translateX(50%);
  box-sizing: border-box;
}

.page-about .about-timeline__body {
  padding-left: clamp(1rem, 2.5vw, 1.6rem);
}

.page-about .about-timeline__body p {
  margin: 0;
  color: rgba(230, 241, 245, .74);
  max-width: 64ch;
}

.page-about .about-timeline__item--accent .about-timeline__year {
  color: var(--green);
}

.page-about .about-timeline__item--accent .about-timeline__year::after {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, .16);
}

.page-about .about-timeline__item--accent .about-timeline__body {
  border-left: 2px solid rgba(57, 255, 136, .32);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-ecosystem__text > p:first-child {
  color: rgba(230, 241, 245, .82);
  margin-top: 0;
}

.page-about .about-ecosystem__subhead {
  margin-top: clamp(1.5rem, 3.5vw, 2.2rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line);
}

.page-about .about-roles {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 1rem;
  padding: clamp(.9rem, 2.4vw, 1.2rem) clamp(1rem, 2.4vw, 1.3rem);
  background: var(--ink);
  align-items: start;
  transition: background .22s ease;
}

.page-about .about-roles__item:hover {
  background: var(--graphite);
}

.page-about .about-roles__idx {
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--blue);
  padding-top: .2rem;
}

.page-about .about-roles__item strong {
  display: block;
  font-size: .95rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: .3rem;
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: rgba(230, 241, 245, .72);
}

.page-about .about-ecosystem__text .muted {
  font-size: .84rem;
  line-height: 1.75;
  margin: 0;
}

.page-about .about-ecosystem__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-ecosystem__media .media__caption {
  padding: .9rem clamp(1rem, 2.4vw, 1.4rem) 1.1rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 客户价值 ---------- */
.page-about .about-why__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-why__card {
  position: relative;
  padding: clamp(1.35rem, 3.2vw, 1.9rem);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(18, 24, 29, .96), rgba(11, 15, 18, .96));
  overflow: hidden;
  transition: border-color .25s ease, transform .3s ease;
}

.page-about .about-why__card::before {
  content: "";
  position: absolute;
  right: -35%;
  top: -55%;
  width: 70%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, .10), transparent 68%);
  pointer-events: none;
}

.page-about .about-why__card:hover {
  border-color: rgba(0, 229, 255, .42);
  transform: translateY(-3px);
}

.page-about .about-why__card--accent {
  background: linear-gradient(155deg, rgba(42, 74, 58, .5), rgba(11, 15, 18, .96));
  border-color: rgba(57, 255, 136, .3);
}

.page-about .about-why__card--accent::before {
  background: radial-gradient(circle, rgba(57, 255, 136, .16), transparent 68%);
}

.page-about .about-why__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--orange);
  margin-bottom: .85rem;
}

.page-about .about-why__card--accent .about-why__num {
  color: var(--green);
}

.page-about .about-why__card p {
  margin: 0;
  color: rgba(230, 241, 245, .76);
  position: relative;
}

.page-about .about-why__cta {
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  background: var(--ink-2);
}

.page-about .about-why__cta .lede {
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  max-width: 60ch;
  color: rgba(230, 241, 245, .88);
}

.page-about .about-why__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
}

/* ---------- 无障碍与降级 ---------- */
.page-about .about-hero__media img,
.page-about .about-venues__media img,
.page-about .about-ecosystem__media img {
  max-width: 100%;
  height: auto;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-venues__panel,
  .page-about .about-why__card,
  .page-about .about-origin__point {
    transition: none;
  }
  .page-about .about-venues__panel:hover,
  .page-about .about-why__card:hover {
    transform: none;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(2.5rem, 6vw, 5rem);
  }

  .page-about .about-hero__media {
    transform: translateY(-1.75rem);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-origin__points {
    border-top: none;
    border-left: 1px solid var(--line);
  }

  .page-about .about-venues__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 6vw, 4.5rem);
  }

  .page-about .about-venues__panels {
    grid-template-columns: 1fr;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 6vw, 4.5rem);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 9rem 1fr;
    gap: clamp(1.5rem, 3.5vw, 2.5rem);
  }

  .page-about .about-timeline::before {
    left: 9rem;
  }

  .page-about .about-timeline__year {
    font-size: clamp(.85rem, 1.4vw, 1.05rem);
  }

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

  .page-about .about-why__card:nth-child(even) {
    transform: translateY(1.4rem);
  }

  .page-about .about-why__card:nth-child(even):hover {
    transform: translateY(1.4rem) translateX(0);
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__title {
    max-width: 17ch;
  }

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

  .page-about .about-venues__panel:first-child {
    grid-column: 1 / -1;
  }
}