.page-about {
  --about-line: rgba(184, 115, 51, 0.34);
  --about-gap: clamp(28px, 5vw, 64px);
  background: var(--deep);
  color: var(--stardust);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(245, 165, 36, 0.18) 0%, rgba(245, 165, 36, 0) 58%),
    radial-gradient(90% 80% at 12% 100%, rgba(63, 61, 143, 0.42) 0%, rgba(11, 28, 58, 0) 62%),
    var(--deep);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(28px, 6vw, 72px) clamp(18px, 4vw, 40px) clamp(32px, 6vw, 76px);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero__media {
  order: 2;
}

.page-about .about-hero__frame {
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid rgba(245, 165, 36, 0.36);
  background: var(--deep-2);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(184, 115, 51, 0.5);
  border-radius: calc(var(--radius-l) - 8px);
  pointer-events: none;
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-hero__text {
  order: 1;
}

.page-about .breadcrumb {
  margin-bottom: 18px;
  color: var(--orbit);
  font-size: 13px;
}

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

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero .eyebrow {
  display: block;
  color: var(--sun);
  letter-spacing: 0.24em;
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 7vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  color: var(--stardust);
  max-width: 18em;
}

.page-about .about-hero .lede {
  color: #C7D3E6;
  font-size: clamp(15px, 2.6vw, 17px);
  line-height: 1.95;
  max-width: 34em;
  margin: 0 0 28px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  border-top: 1px solid rgba(232, 237, 246, 0.14);
  padding-top: 22px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__num {
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
  color: var(--sun-soft);
  line-height: 1;
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(30px, 5vw, 62px) clamp(18px, 4vw, 40px) clamp(56px, 9vw, 110px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: none;
}

.page-about .about-index__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--copper);
  margin: 0 0 16px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0 10px 14px;
  text-decoration: none;
  color: var(--orbit);
  border-left: 2px solid rgba(107, 124, 153, 0.28);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-index__link:hover {
  color: var(--sun-soft);
  border-left-color: var(--copper);
  transform: translateX(3px);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--sun);
  border-left-color: var(--sun);
}

.page-about .about-index__no {
  font-size: 12px;
  color: var(--copper);
  letter-spacing: 0.08em;
}

.page-about .about-index__link[aria-current="true"] .about-index__no {
  color: var(--sun);
}

.page-about .about-index__label {
  font-size: 14px;
  line-height: 1.5;
}

.page-about .about-index__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-m);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--orbit);
}

/* ---------- 章节 ---------- */
.page-about .about-canvas {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--top-h) + 20px);
}

.page-about .about-chapter:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-chapter__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
  margin: 0 0 14px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.page-about .about-chapter__label .mono {
  color: var(--sun);
  font-size: 15px;
  letter-spacing: 0;
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 4.4vw, 32px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--stardust);
  margin: 0 0 18px;
}

.page-about .about-section-lede {
  color: #B9C6DA;
  font-size: 15px;
  line-height: 1.95;
  margin: 0 0 26px;
  max-width: 40em;
}

.page-about .about-prose p {
  color: #C7D3E6;
  font-size: 15px;
  line-height: 2;
  margin: 0 0 16px;
  max-width: 44em;
}

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

.page-about a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.42);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about a:hover {
  color: var(--sun-soft);
  border-bottom-color: var(--sun-soft);
}

/* ---------- 三栏说明 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-col {
  padding: 20px 20px 22px;
  background: var(--deep-2);
  border-radius: var(--radius-m);
  border-left: 3px solid var(--copper);
}

.page-about .about-col__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--sun-soft);
  letter-spacing: 0.01em;
}

.page-about .about-col__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: #B9C6DA;
}

/* ---------- 旁注玻璃卡 ---------- */
.page-about .about-note {
  margin-top: 26px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  backdrop-filter: blur(6px);
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: #C7D3E6;
}

/* ---------- 时间轴 ---------- */
.page-about .about-media {
  margin: 0 0 30px;
}

.page-about .about-media .media__frame {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid rgba(184, 115, 51, 0.32);
  background: var(--deep-2);
}

.page-about .about-media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-media .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--orbit);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--sun) 0%, var(--copper) 55%, rgba(184, 115, 51, 0.15) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 14px 0 18px 34px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 22px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--copper);
  box-sizing: border-box;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .timeline__item:hover .timeline__dot {
  background: var(--sun);
  border-color: var(--sun-soft);
  box-shadow: 0 0 0 5px rgba(245, 165, 36, 0.16);
}

.page-about .timeline__year {
  font-size: 20px;
  font-weight: 700;
  color: var(--sun-soft);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--stardust);
  line-height: 1.5;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: #B9C6DA;
}

.page-about .timeline__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.9;
  color: var(--orbit);
  border-left: 2px solid var(--about-line);
  padding-left: 0;
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease), padding 0.28s var(--ease), margin 0.28s var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  max-height: 10em;
  opacity: 1;
  padding-left: 12px;
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  align-items: center;
  margin-bottom: 28px;
}

.page-about .about-team__figure {
  margin: 0;
  max-width: 300px;
  justify-self: center;
  width: 100%;
}

.page-about .team-ring {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team__caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--orbit);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-align: center;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  grid-template-areas:
    "swatch role count"
    "swatch desc desc";
  gap: 4px 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(232, 237, 246, 0.1);
}

.page-about .about-team__swatch {
  grid-area: swatch;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-top: 6px;
}

.page-about .about-team__swatch--sun { background: var(--sun); }
.page-about .about-team__swatch--cyan { background: var(--cyan); }
.page-about .about-team__swatch--copper { background: var(--copper); }
.page-about .about-team__swatch--soft { background: var(--sun-soft); }

.page-about .about-team__role {
  grid-area: role;
  font-size: 15px;
  font-weight: 700;
  color: var(--stardust);
}

.page-about .about-team__count {
  grid-area: count;
  font-size: 22px;
  font-weight: 700;
  color: var(--sun);
  line-height: 1.1;
}

.page-about .about-team__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--orbit);
}

.page-about .about-rule {
  background: rgba(63, 61, 143, 0.34);
  border: 1px solid rgba(245, 165, 36, 0.42);
  border-left: 4px solid var(--sun);
  border-radius: var(--radius-m);
  padding: 20px 22px;
}

.page-about .about-rule .rule-box__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sun);
}

.page-about .about-rule p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.95;
  color: #DCE5F2;
}

/* ---------- 分类清单 ---------- */
.page-about .cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .cat-list__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(232, 237, 246, 0.1);
}

.page-about .cat-list__item:first-child {
  border-top: 1px solid rgba(232, 237, 246, 0.1);
}

.page-about .cat-list__no {
  font-size: 26px;
  font-weight: 700;
  color: rgba(245, 165, 36, 0.5);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .cat-list__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--stardust);
}

.page-about .cat-list__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: #B9C6DA;
}

.page-about .about-cross {
  margin: 26px 0 0;
  font-size: 14.5px;
  line-height: 1.95;
  color: #B9C6DA;
}

/* ---------- 合作生态数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-stat {
  padding: 20px 22px;
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, rgba(14, 59, 54, 0.92) 0%, rgba(19, 42, 82, 0.92) 100%);
  border: 1px solid rgba(53, 224, 208, 0.24);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 700;
  color: var(--stardust);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .about-stat__unit {
  font-size: 13px;
  color: var(--cyan);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.page-about .about-stat__label {
  font-size: 13.5px;
  line-height: 1.85;
  color: #A8C0C0;
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 32px;
  padding: 24px 22px;
  border-radius: var(--radius-m);
  background: var(--deep-2);
  border: 1px solid rgba(184, 115, 51, 0.4);
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--stardust);
}

.page-about .about-cta__sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.95;
  color: #B9C6DA;
}

.page-about .about-cta__btn {
  text-decoration: none;
  border-bottom: none;
  white-space: nowrap;
}

.page-about .about-cta__btn:hover {
  border-bottom: none;
}

.page-about .about-foot-link {
  margin: 22px 0 0;
  font-size: 13.5px;
  color: var(--orbit);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 460px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-hero__media {
    order: 1;
  }

  .page-about .about-hero__text {
    order: 2;
  }

  .page-about .about-body {
    grid-template-columns: 244px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 62px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--top-h) + 28px);
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

  .page-about .about-team__figure {
    justify-self: start;
  }

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

  .page-about .timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 4px 20px;
    padding-left: 44px;
  }

  .page-about .timeline__year {
    font-size: 26px;
    grid-row: 1 / span 2;
  }

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

  .page-about .timeline__dot {
    left: 2px;
  }
}

@media (hover: none) {
  .page-about .timeline__more {
    max-height: none;
    opacity: 1;
    padding-left: 12px;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__more,
  .page-about .about-index__link,
  .page-about .timeline__dot {
    transition: none;
  }
}