.page-about {
  --about-hair: rgba(215, 224, 238, 0.12);
  --about-hair-soft: rgba(215, 224, 238, 0.07);
  --about-yellow-soft: rgba(232, 255, 59, 0.14);
  --about-ink-text: #3f4c60;
  background: var(--ink-900);
  color: var(--text-on-dark);
  overflow-x: clip;
}

.page-about .section-pad {
  padding: clamp(56px, 9vw, 96px) 0;
}

.page-about .chapter {
  margin-bottom: 28px;
}

.page-about .breadcrumbs {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 clamp(48px, 8vw, 80px);
  background:
    radial-gradient(140% 90% at 92% -12%, rgba(59, 224, 200, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--about-hair-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-hair-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 26px;
}

.page-about .about-hero__grid > * {
  min-width: 0;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.4vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-hero__title .hl {
  color: var(--whistle);
}

.page-about .about-hero__intro {
  margin: 22px 0 0;
  max-width: 46rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-facts {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  padding: 20px;
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.92), rgba(10, 27, 51, 0.7));
  box-shadow: var(--shadow-card);
}

.page-about .hero-facts__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .hero-facts__list {
  margin: 14px 0 0;
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .hero-fact:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .hero-fact__k {
  font-size: 0.82rem;
  color: var(--text-on-dark-dim);
}

.page-about .hero-fact__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--whistle);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 44px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .hero-facts {
    margin-bottom: 8px;
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  background: var(--ink-900);
}

.page-about .timeline__side {
  position: absolute;
  right: 10px;
  top: 140px;
  display: none;
  color: var(--mist);
}

.page-about .timeline__figure {
  margin: 0 0 32px;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--ink-800);
}

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

.page-about .about-media--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-media--photo img {
  aspect-ratio: 14 / 9;
}

.page-about .about-media--ice img {
  aspect-ratio: 3 / 2;
}

.page-about .about-media__cap {
  padding: 10px 14px;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--text-on-dark-dim);
  border-top: 1px solid var(--about-hair-soft);
  background: rgba(10, 27, 51, 0.6);
}

.page-about .stage-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 36px;
  padding: 0;
}

.page-about .stage-index__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-on-dark-dim);
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .stage-index__link:hover {
  color: var(--whistle);
  border-color: rgba(232, 255, 59, 0.5);
}

.page-about .stage-index__link[aria-current="true"] {
  color: var(--whistle);
  background: var(--about-yellow-soft);
  border-color: rgba(232, 255, 59, 0.45);
}

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

.page-about .timeline__rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(232, 255, 59, 0.5) 0%, rgba(215, 224, 238, 0.14) 45%, rgba(215, 224, 238, 0.06) 100%);
}

.page-about .stage {
  position: relative;
  padding: 0 0 42px 32px;
}

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

.page-about .stage__dot {
  position: absolute;
  left: 0;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--mist);
  box-shadow: 0 0 0 4px rgba(147, 167, 196, 0.12);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .stage[data-active="true"] .stage__dot {
  background: var(--whistle);
  box-shadow: 0 0 0 6px var(--about-yellow-soft);
}

.page-about .stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .stage__version {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 3rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: rgba(242, 246, 252, 0.22);
  transition: color 0.3s var(--ease);
}

.page-about .stage[data-active="true"] .stage__version {
  color: var(--whistle);
}

.page-about .stage__phase {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .stage__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.12rem, 3.6vw, 1.55rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .stage__text {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .stage__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

@media (min-width: 960px) {
  .page-about .timeline__side {
    display: block;
  }

  .page-about .timeline__rail::before {
    left: 50%;
  }

  .page-about .stage {
    width: calc(50% - 40px);
    padding: 0 0 56px;
  }

  .page-about .stage:nth-child(odd) {
    text-align: right;
  }

  .page-about .stage:nth-child(odd) .stage__head,
  .page-about .stage:nth-child(odd) .stage__meta {
    justify-content: flex-end;
  }

  .page-about .stage:nth-child(odd) .stage__dot {
    left: calc(100% + 34.5px);
  }

  .page-about .stage:nth-child(even) {
    margin-left: auto;
  }

  .page-about .stage:nth-child(even) .stage__dot {
    left: -45.5px;
  }
}

/* ---------- 团队 ---------- */
.page-about .team {
  background: var(--ink-800);
  border-top: 1px solid var(--about-hair-soft);
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .team__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .role-list {
  display: grid;
  gap: 12px;
}

.page-about .role {
  padding: 16px 18px;
  border: 1px solid var(--about-hair);
  border-left: 2px solid rgba(59, 224, 200, 0.5);
  border-radius: var(--radius);
  background: rgba(10, 27, 51, 0.55);
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .role__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ice);
}

.page-about .role__num {
  font-size: 1.08rem;
  color: var(--whistle);
}

.page-about .role__desc {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-on-dark-dim);
}

.page-about .flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .flow__idx {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ice);
}

.page-about .flow__desc {
  margin: 4px 0 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--text-on-dark-dim);
}

@media (min-width: 900px) {
  .page-about .team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .team__media {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 版本对照 ---------- */
.page-about .versions {
  background: var(--ink-900);
}

.page-about .version-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: rgba(18, 41, 74, 0.45);
}

.page-about .version-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.page-about .version-table th,
.page-about .version-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--about-hair-soft);
  line-height: 1.7;
}

.page-about .version-table thead th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: rgba(10, 27, 51, 0.72);
}

.page-about .version-table tbody th {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--whistle);
  white-space: nowrap;
}

.page-about .version-table tbody tr:hover {
  background: rgba(232, 255, 59, 0.05);
}

.page-about .version-notes {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .version-note {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: rgba(18, 41, 74, 0.35);
}

.page-about .version-note summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .version-note summary::-webkit-details-marker {
  display: none;
}

.page-about .version-note summary::after {
  content: "＋";
  color: var(--cyan);
}

.page-about .version-note[open] summary::after {
  content: "－";
}

.page-about .version-note__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--text-on-dark-dim);
}

/* ---------- 吉林专区 ---------- */
.page-about .jilin {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .jilin .chapter__title {
  color: var(--graphite);
}

.page-about .jilin .chapter__note {
  color: var(--about-ink-text);
}

.page-about .jilin__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .jilin__text {
  margin: 0 0 14px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .jilin__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.page-about .jilin-stat {
  padding-top: 12px;
  border-top: 2px solid var(--graphite);
}

.page-about .jilin-stat__v {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: 0.02em;
  color: var(--graphite);
}

.page-about .jilin-stat__k {
  margin: 4px 0 0;
  font-size: 0.8rem;
  color: var(--about-ink-text);
}

.page-about .jilin .about-media {
  border-color: var(--line);
  background: #dfe8f5;
}

.page-about .jilin .about-media__cap {
  color: var(--about-ink-text);
  border-top-color: var(--line);
  background: rgba(255, 255, 255, 0.7);
}

@media (min-width: 900px) {
  .page-about .jilin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }
}

/* ---------- 承诺 ---------- */
.page-about .promise {
  background: var(--ink-900);
}

.page-about .promise__grid {
  display: grid;
  gap: 16px;
}

.page-about .promise-card {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.85), rgba(10, 27, 51, 0.6));
  box-shadow: var(--shadow-card);
}

.page-about .promise-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 2px;
  height: 22px;
  background: var(--whistle);
}

.page-about .promise-card__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .promise-card__title {
  margin: 12px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ice);
}

.page-about .promise-card__text {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-on-dark-dim);
}

@media (min-width: 760px) {
  .page-about .promise__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(44px, 7vw, 72px) 0;
  background: linear-gradient(90deg, var(--turf) 0%, var(--ink-800) 62%, var(--ink-900) 100%);
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4.4vw, 2.2rem);
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 44rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-on-dark);
}

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

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}