.page-about {
  --about-cut: 18px;
  --about-glow: rgba(216, 164, 60, 0.16);
  display: block;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 32px) 0 clamp(34px, 6vw, 68px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -12% auto -12%;
  height: 78%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(55% 75% at 74% 12%, rgba(216, 164, 60, 0.18), transparent 68%),
    radial-gradient(42% 58% at 12% 0%, rgba(63, 210, 255, 0.10), transparent 70%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--gold-300);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 3.25rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--mist-100);
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 48ch;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.9;
  color: var(--slate-400);
}

.page-about .about-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
}

@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  background: linear-gradient(165deg, rgba(20, 26, 34, 0.96), rgba(10, 12, 16, 0.96));
  padding: 14px 14px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.15rem, 2.3vw, 1.5rem);
  font-weight: 600;
  color: var(--gold-300);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.page-about .about-stat__num small {
  margin-left: 2px;
  font-size: 0.6em;
  color: var(--gold-500);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--slate-400);
}

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

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-700);
  background: var(--panel-800);
  padding: 8px;
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 8px;
  height: 42%;
  pointer-events: none;
  background: linear-gradient(0deg, rgba(10, 12, 16, 0.72), transparent);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--ink-900);
}

.page-about .about-hero__mark {
  margin: 12px 0 0;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--slate-400);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(30px, 5vw, 56px) 0 clamp(44px, 7vw, 84px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: 198px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 68px);
  }
}

/* ---------- 章节小目录 ---------- */
.page-about .about-toc {
  position: relative;
}

@media (min-width: 1000px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

.page-about .about-toc .toc {
  border: 1px solid var(--line-700);
  background: linear-gradient(165deg, rgba(20, 26, 34, 0.92), rgba(10, 12, 16, 0.92));
  padding: 14px 14px 12px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--gold-500);
}

.page-about .toc__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .toc__list a {
  display: block;
  padding: 7px 11px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--slate-400);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line-700);
  background: rgba(10, 12, 16, 0.5);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .toc__list a:hover {
  color: var(--gold-300);
  border-color: var(--bronze-700);
}

.page-about .toc__list a.is-active {
  color: var(--ink-900);
  background: var(--gold-500);
  border-color: var(--gold-500);
}

@media (min-width: 1000px) {
  .page-about .toc__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }

  .page-about .toc__list li {
    flex: 1 1 auto;
  }

  .page-about .toc__list a {
    white-space: normal;
    line-height: 1.5;
  }
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 7vw, 88px);
  min-width: 0;
}

.page-about .about-sec {
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-sec + .about-sec::before {
  content: "";
  display: block;
  width: min(190px, 42%);
  height: 2px;
  margin-bottom: clamp(26px, 4vw, 46px);
  background: linear-gradient(90deg, var(--gold-500), rgba(216, 164, 60, 0));
  transform: skewY(-4deg);
  transform-origin: left center;
}

.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .sec-head__num {
  font-size: clamp(1.9rem, 4.2vw, 2.6rem);
  line-height: 0.92;
  color: var(--gold-500);
  opacity: 0.62;
}

.page-about .sec-head__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.32rem, 2.7vw, 1.72rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--mist-100);
}

.page-about .sec-head__sub {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--slate-400);
  max-width: 58ch;
}

.page-about .sec-head__chip {
  grid-column: 2;
  justify-self: start;
  margin-top: 10px;
  padding: 3px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--blue-400);
  border: 1px dashed rgba(63, 210, 255, 0.42);
}

@media (min-width: 720px) {
  .page-about .sec-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .sec-head__chip {
    grid-column: 3;
    margin-top: 0;
  }
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--mist-100);
  max-width: 66ch;
}

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

.page-about .prose a,
.page-about .about-next__intro a {
  color: var(--blue-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 210, 255, 0.4);
}

.page-about .prose a:hover {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
}

/* ---------- 三条要点 ---------- */
.page-about .about-points {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-points li {
  display: grid;
  gap: 6px;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--bronze-700);
  background: linear-gradient(90deg, rgba(216, 164, 60, 0.07), transparent 62%);
}

.page-about .about-points__key {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold-300);
}

.page-about .about-points li p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--slate-400);
  max-width: 62ch;
}

@media (min-width: 760px) {
  .page-about .about-points li {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 团队轨道 ---------- */
.page-about .about-tracks {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .track {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--line-700);
  background: linear-gradient(150deg, rgba(20, 26, 34, 0.95), rgba(10, 12, 16, 0.95));
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .track::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 62%;
  background: linear-gradient(180deg, var(--gold-500), rgba(216, 164, 60, 0));
}

.page-about .track:hover {
  border-color: var(--gold-500);
  transform: translateY(-2px);
}

@media (min-width: 900px) {
  .page-about .about-tracks {
    gap: 20px;
  }

  .page-about .track:nth-child(1) {
    margin-right: 22%;
  }

  .page-about .track:nth-child(2) {
    margin-left: 14%;
    margin-right: 6%;
  }

  .page-about .track:nth-child(3) {
    margin-left: 4%;
    margin-right: 18%;
  }
}

.page-about .track__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .track__idx {
  padding: 2px 9px;
  font-size: 0.86rem;
  color: var(--gold-500);
  border: 1px solid var(--bronze-700);
}

.page-about .track__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--mist-100);
}

.page-about .track__tag {
  margin-left: auto;
  padding: 3px 8px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--blue-400);
  border: 1px dashed rgba(63, 210, 255, 0.4);
}

.page-about .track__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--slate-400);
  max-width: 62ch;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 10px;
  border: 1px solid var(--line-700);
  background: var(--panel-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--ink-900);
}

.page-about .about-figure__cap {
  margin: 10px 2px 2px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

/* ---------- 运营节奏 ---------- */
.page-about .rhythm {
  list-style: none;
  display: grid;
  gap: 2px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .rhythm__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 6px 20px 18px;
  border-left: 1px solid var(--line-700);
  background: linear-gradient(90deg, rgba(216, 164, 60, 0.06), transparent 48%);
  transition: border-color 0.25s ease;
}

.page-about .rhythm__item:hover {
  border-left-color: var(--gold-500);
}

@media (min-width: 760px) {
  .page-about .rhythm__item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }
}

.page-about .rhythm__cycle {
  font-size: clamp(1.1rem, 2.2vw, 1.32rem);
  letter-spacing: 0.08em;
  color: var(--gold-500);
  line-height: 1.3;
}

.page-about .rhythm__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--mist-100);
}

.page-about .rhythm__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--slate-400);
  max-width: 62ch;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  display: grid;
  gap: 14px;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--bronze-700), rgba(138, 101, 34, 0.12));
}

.page-about .timeline__item {
  position: relative;
  padding: 16px 18px 18px;
  border: 1px solid var(--line-700);
  background: rgba(20, 26, 34, 0.6);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .timeline__item:hover {
  border-color: var(--bronze-700);
  background: rgba(20, 26, 34, 0.92);
}

.page-about .timeline__dot {
  position: absolute;
  top: 20px;
  left: -30px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(216, 164, 60, 0.14);
}

.page-about .timeline__item.is-current .timeline__dot {
  background: transparent;
  border: 2px solid var(--gold-500);
  box-shadow: none;
  animation: about-node-pulse 2.8s ease-in-out infinite;
}

@keyframes about-node-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(216, 164, 60, 0.4);
  }
  50% {
    box-shadow: 0 0 0 9px rgba(216, 164, 60, 0);
  }
}

.page-about .timeline__when {
  margin: 0 0 7px;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--blue-400);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--mist-100);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--slate-400);
  max-width: 62ch;
}

/* ---------- 末段引导 ---------- */
.page-about .about-next {
  border-color: var(--bronze-700);
  background: linear-gradient(150deg, rgba(216, 164, 60, 0.09), rgba(20, 26, 34, 0.6) 55%);
}

.page-about .panel__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  color: var(--mist-100);
}

.page-about .about-next__intro {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate-400);
  max-width: 60ch;
}

.page-about .about-next__list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 20px 0 0;
  padding: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
}

@media (min-width: 700px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-next__list li {
  margin: 0;
  background: rgba(10, 12, 16, 0.6);
}

.page-about .about-next__list a {
  display: block;
  padding: 15px 16px;
  font-weight: 600;
  font-size: 0.96rem;
  text-decoration: none;
  color: var(--mist-100);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-next__list a span {
  display: block;
  margin-top: 5px;
  font-weight: 400;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-about .about-next__list a:hover {
  background: rgba(216, 164, 60, 0.1);
  color: var(--gold-300);
}

.page-about .about-next__list a:hover span {
  color: var(--gold-300);
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .track,
  .page-about .rhythm__item,
  .page-about .timeline__item,
  .page-about .about-next__list a,
  .page-about .toc__list a {
    transition: none;
  }

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

  .page-about .timeline__item.is-current .timeline__dot {
    animation: none;
    box-shadow: 0 0 0 4px rgba(216, 164, 60, 0.22);
  }
}