.page-about {
  --about-line: rgba(143, 179, 199, .26);
  --about-line-strong: rgba(143, 179, 199, .44);
  --about-soft: rgba(234, 246, 255, .74);
  --about-dim: rgba(234, 246, 255, .54);
  --about-ink-soft: rgba(11, 31, 46, .76);
  --about-ink-dim: rgba(11, 31, 46, .52);
  background: var(--deep);
  color: var(--ice);
  overflow-x: hidden;
}

.page-about .data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  left: -12%;
  right: -12%;
  height: 78%;
  background:
    radial-gradient(58% 62% at 28% 0%, rgba(53, 224, 208, .16), transparent 70%),
    radial-gradient(48% 54% at 84% 16%, rgba(255, 107, 44, .13), transparent 72%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(1rem, 2.5vw, 1.75rem);
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  gap: clamp(.9rem, 2.4vw, 1.6rem);
  padding: clamp(1.35rem, 4vw, 3rem);
  border: 1px solid var(--about-line);
  border-radius: var(--r-xl);
  background: linear-gradient(158deg, rgba(11, 43, 69, .88), rgba(6, 24, 38, .62));
  box-shadow: inset 0 1px 0 rgba(234, 246, 255, .07);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 76px;
  background-image: repeating-linear-gradient(to bottom, var(--about-line) 0 1px, transparent 1px 14px);
  opacity: .55;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 14%, #000 86%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 14%, #000 86%, transparent);
  pointer-events: none;
}

.page-about .about-hero__scale {
  display: flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__scale-num {
  font-size: .9rem;
  font-weight: 600;
}

.page-about .about-hero__scale-rule {
  display: block;
  width: clamp(28px, 8vw, 68px);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .about-hero__scale-text {
  color: var(--about-dim);
}

.page-about .about-hero__title {
  margin: .5rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 6.4vw, 4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(.9rem, 2vw, 1.4rem) 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.2rem, 3vw, 1.9rem);
}

.page-about .about-hero__media {
  margin: clamp(-2.5rem, -2vw, -1.25rem) 0 0;
  position: relative;
  z-index: 2;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__caption {
  margin-top: .7rem;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--about-dim);
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
  padding-top: clamp(1rem, 2.5vw, 1.5rem);
  border-top: 1px solid var(--about-line);
}

.page-about .about-index__item {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  padding: .5rem .95rem;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  font-size: .84rem;
  color: var(--about-soft);
  text-decoration: none;
  transition: border-color .3s var(--ease), color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-index__item .data-num {
  font-size: .72rem;
  color: var(--cyan);
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  border-color: var(--cyan);
  color: var(--ice);
  background: rgba(53, 224, 208, .08);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(2.75rem, 7vw, 5.5rem) 0;
}

.page-about .about-chapter__head {
  display: grid;
  gap: .55rem;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.75rem);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5.2vw, 3.4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .04em;
  color: rgba(53, 224, 208, .34);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .prose {
  max-width: 40em;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: clamp(.98rem, 1.4vw, 1.06rem);
  line-height: 1.85;
  color: var(--about-soft);
}

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

.page-about .about-lead {
  max-width: 44ch;
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.5rem);
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .section-title {
  max-width: 22ch;
}

/* ---------- 01 原则 ---------- */
.page-about .about-principles {
  padding: clamp(1rem, 2.5vw, 1.5rem) 0 clamp(1rem, 2.5vw, 1.5rem) clamp(1rem, 2.5vw, 1.6rem);
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(90deg, rgba(255, 107, 44, .11), transparent 72%);
}

.page-about .about-principles__title {
  margin: 0 0 1rem;
  font-size: .82rem;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
  counter-reset: principle;
}

.page-about .about-principles__list li {
  position: relative;
  padding-left: 1.8rem;
  counter-increment: principle;
}

.page-about .about-principles__list li::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .15rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--cyan);
}

.page-about .about-principles__list strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
  margin-bottom: .25rem;
}

.page-about .about-principles__list span {
  display: block;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--about-dim);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-chapter--trench {
  background: linear-gradient(180deg, var(--deep), var(--trench) 45%, var(--deep));
}

.page-about .about-journey {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: .7rem;
  bottom: .7rem;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--about-line-strong) 8%, var(--about-line-strong) 92%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.4rem;
  padding-bottom: clamp(1.5rem, 3.5vw, 2.4rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1px solid var(--about-line-strong);
  background: var(--deep);
  transition: background .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease);
}

.page-about .about-timeline__item.is-in::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 44, .14);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.8rem);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-timeline__name {
  margin: .25rem 0 .4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 40ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--about-dim);
}

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

.page-about .about-journey__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
}

.page-about .about-journey__caption {
  margin-top: .75rem;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 03 数据（浅色画布） ---------- */
.page-about .about-chapter--canvas {
  background: var(--canvas);
  color: var(--ink);
}

.page-about .about-chapter--canvas .about-chapter__num {
  color: rgba(11, 31, 46, .2);
}

.page-about .about-chapter--canvas .section-title {
  color: var(--ink);
}

.page-about .about-chapter--canvas .prose p {
  color: var(--about-ink-soft);
}

.page-about .about-stats {
  display: grid;
  gap: clamp(.75rem, 2vw, 1.25rem);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-stat {
  padding-top: .85rem;
  border-top: 1px solid rgba(11, 31, 46, .16);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-stat:first-child .about-stat__num {
  color: var(--orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .35rem;
  font-size: .82rem;
  line-height: 1.5;
  color: var(--about-ink-dim);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid rgba(11, 31, 46, .12);
}

.page-about .about-figure__caption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--about-ink-dim);
}

/* ---------- 04 团队 ---------- */
.page-about .about-crew {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-crew__item {
  padding-top: 1rem;
  border-top: 1px solid var(--about-line);
  transition: border-color .3s var(--ease);
}

.page-about .about-crew__item:hover {
  border-color: var(--cyan);
}

.page-about .about-crew__name {
  margin: 0 0 .45rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-partners {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
  margin-top: clamp(2rem, 4.5vw, 3.25rem);
  padding: clamp(1.25rem, 3.5vw, 2.25rem);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, rgba(53, 224, 208, .1), rgba(255, 107, 44, .07) 70%, transparent);
}

.page-about .about-partners__num {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-partners__title {
  margin: 0 0 .5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-partners__body p {
  margin: 0;
  max-width: 46ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 05 覆盖 ---------- */
.page-about .about-chapter--glow {
  background:
    radial-gradient(90% 70% at 8% 0%, rgba(255, 107, 44, .12), transparent 62%),
    radial-gradient(80% 70% at 95% 20%, rgba(53, 224, 208, .12), transparent 65%),
    var(--deep);
}

.page-about .about-phases {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-phase {
  padding: clamp(1.2rem, 3vw, 2rem);
  background: linear-gradient(160deg, rgba(11, 43, 69, .92), rgba(6, 24, 38, .94));
}

.page-about .about-phase__step {
  display: inline-block;
  padding: .22rem .7rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--about-line-strong);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-phase__name {
  margin: .85rem 0 .5rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-phase p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 06 承诺 ---------- */
.page-about .about-commit {
  background: linear-gradient(180deg, var(--deep), var(--trench));
  border-top: 1px solid var(--about-line);
}

.page-about .about-commit__list {
  list-style: none;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  padding: 0;
  display: grid;
  gap: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-about .about-commit__item {
  display: grid;
  gap: .9rem;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  padding-bottom: clamp(1.1rem, 2.5vw, 1.6rem);
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-commit__idx {
  font-size: .82rem;
  color: var(--orange);
  padding-top: .2rem;
}

.page-about .about-commit__item h3 {
  margin: 0 0 .4rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-commit__item p {
  margin: 0;
  max-width: 48ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-commit__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .8rem 1.25rem;
}

.page-about .about-commit__link {
  font-size: .92rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .4);
  padding-bottom: 2px;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

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

.page-about .about-commit__note {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-commit__note a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .about-commit__note a:hover,
.page-about .about-commit__note a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-journey {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }

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

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

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

@media (min-width: 1100px) {
  .page-about .about-hero__frame {
    padding-right: clamp(3rem, 9vw, 7rem);
  }

  .page-about .about-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-index__item,
  .page-about .about-crew__item,
  .page-about .about-commit__link {
    transition: none;
  }
}