.page-about {
  background: var(--c-blue-950);
  color: var(--c-text);
  overflow-x: hidden;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 5.2vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--c-white);
  margin: 10px 0 18px;
}

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--c-cyan-600);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-about .about-inline-link {
  margin: 18px 0 0;
  font-size: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 46px;
  border-bottom: 2px solid var(--c-line);
  background:
    radial-gradient(circle at 78% -10%, rgba(45, 226, 230, 0.16), transparent 58%),
    linear-gradient(180deg, var(--c-blue-900) 0%, var(--c-blue-950) 78%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(39, 68, 92, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(39, 68, 92, 0.42) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-hero__title {
  margin: 12px 0 16px;
  color: var(--c-white);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  color: var(--c-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__side {
  min-width: 0;
  padding: 20px;
  border: 2px solid var(--c-line);
  border-left: 4px solid var(--c-cyan);
  background: linear-gradient(160deg, var(--c-blue-800), var(--c-blue-900));
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__annotation {
  margin: 0 0 14px;
  color: var(--c-cyan);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-stat {
  min-width: 0;
  padding-top: 10px;
  border-top: 1px solid var(--c-line);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-stat--wide {
  grid-column: 1 / -1;
}

.page-about .about-stat__num {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.05;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  margin-top: 0;
  padding-top: 18px;
  padding-bottom: 0;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 2px solid var(--c-line);
  padding-bottom: 18px;
}

.page-about .about-index__link {
  display: inline-block;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  text-decoration: none;
  border: 1px solid var(--c-line);
  background: rgba(13, 36, 56, 0.6);
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-white);
  border-color: var(--c-cyan-600);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--c-blue-950);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  font-weight: 700;
}

/* ---------- 通用双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-split__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--c-line);
  box-shadow: var(--shadow-hard);
  background: var(--c-blue-800);
  min-width: 0;
}

.page-about .about-figure .yk-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--wide .yk-media__img {
  aspect-ratio: 16 / 7;
}

.page-about .about-figure--team .yk-media__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure .yk-media__caption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-muted);
  border-top: 2px solid var(--c-line);
}

.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-points__item {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--c-white);
}

.page-about .about-points__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 10px;
  background: var(--c-orange);
  transform: skewX(-12deg);
}

/* ---------- 团队 ---------- */
.page-about .about-head {
  max-width: 760px;
}

.page-about .about-head__lead {
  color: var(--c-muted);
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .about-role {
  min-width: 0;
  padding: 22px 20px;
  border: 2px solid var(--c-line);
  border-top: 4px solid var(--c-cyan-600);
  background: var(--c-blue-900);
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.page-about .about-role:hover {
  border-top-color: var(--c-orange);
  background: var(--c-blue-800);
  transform: translateY(-3px);
}

.page-about .about-role__num {
  display: block;
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 10px;
}

.page-about .about-role:hover .about-role__num {
  color: var(--c-orange);
}

.page-about .about-role__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-team__foot {
  display: grid;
  gap: 22px;
  margin-top: 30px;
  min-width: 0;
}

.page-about .about-team__note {
  padding: 24px 20px;
  background: var(--c-blue-800);
  min-width: 0;
}

.page-about .about-card-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--c-white);
}

.page-about .about-team__note p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-text);
}

/* ---------- 演进时间轴 ---------- */
.page-about .about-evo {
  border-top: 2px solid var(--c-line);
  background: linear-gradient(180deg, var(--c-blue-900), var(--c-blue-950));
}

.page-about .about-evo__grid {
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-evo__aside-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
  max-width: 40ch;
}

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

.page-about .about-tl {
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-cyan-600) 45%, var(--c-line) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 34px;
  min-width: 0;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 14px;
  height: 14px;
  background: var(--c-blue-950);
  border: 2px solid var(--c-cyan);
}

.page-about .about-tl__item--now::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 5px rgba(255, 138, 61, 0.16);
}

.page-about .about-tl__step {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
  margin-bottom: 6px;
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 24px);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.32;
}

.page-about .about-tl__item--now .about-tl__title {
  color: var(--c-orange);
}

.page-about .about-tl__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-text);
}

.page-about .about-tl__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-spec {
  margin: 0;
  border: 2px solid var(--c-line);
  background: var(--c-blue-900);
  box-shadow: var(--shadow-hard);
}

.page-about .about-spec__row {
  display: grid;
  gap: 4px;
  padding: 15px 18px;
  border-top: 2px solid var(--c-line);
}

.page-about .about-spec__row:first-child {
  border-top: 0;
}

.page-about .about-spec__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-about .about-spec__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-text);
  min-width: 0;
  word-break: break-word;
}

.page-about .about-coverage__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 合作与场景 ---------- */
.page-about .about-eco {
  border-top: 2px solid var(--c-line);
}

.page-about .about-eco__grid {
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-eco__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-scenes {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .about-scene {
  padding: 20px;
  border: 2px solid var(--c-line);
  border-left: 4px solid var(--c-away);
  background: var(--c-blue-900);
  transition: border-left-color 0.18s ease, background 0.18s ease;
}

.page-about .about-scene--home {
  border-left-color: var(--c-home);
}

.page-about .about-scene--media {
  border-left-color: var(--c-cyan);
}

.page-about .about-scene--campus {
  border-left-color: var(--c-orange);
}

.page-about .about-scene:hover {
  background: var(--c-blue-800);
}

.page-about .about-scene__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 支持入口 ---------- */
.page-about .about-support {
  padding-bottom: 72px;
}

.page-about .about-support__panel {
  display: grid;
  gap: 26px;
  padding: 26px 20px;
  border: 2px solid var(--c-cyan-600);
  background:
    linear-gradient(135deg, rgba(45, 226, 230, 0.09), transparent 55%),
    var(--c-blue-900);
  box-shadow: var(--shadow-hard);
  min-width: 0;
}

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

.page-about .about-support__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text);
  max-width: 52ch;
}

.page-about .about-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-support__list {
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--c-line);
}

.page-about .about-support__list .yk-contactlist__item {
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-support__list .yk-contactlist__val {
  word-break: break-word;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 36px 0 60px;
  }

  .page-about .about-stat {
    padding-top: 12px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team__foot {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: stretch;
    gap: 26px;
  }

  .page-about .about-spec__row {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
    padding: 16px 22px;
  }

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-support__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
    padding: 36px 34px;
  }

  .page-about .about-support__list {
    border-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .about-hero__side {
    padding: 26px 24px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split__text p {
    font-size: 16px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-evo__grid {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-evo__aside {
    position: sticky;
    top: calc(var(--header-offset) + 20px);
    padding-right: 8px;
    border-right: 2px solid var(--c-line);
  }

  .page-about .about-tl {
    padding-left: 34px;
  }
}

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

  .page-about .about-role:hover {
    transform: none;
  }
}