.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 52px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(47, 230, 200, 0.16), transparent 62%),
    radial-gradient(90% 80% at -5% 105%, rgba(255, 107, 44, 0.15), transparent 62%),
    var(--ink);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(167, 179, 173, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167, 179, 173, 0.08) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(22px, 4vw, 40px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--silver);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(167, 179, 173, 0.6);
}

.page-about .breadcrumb__link {
  color: var(--silver);
  text-decoration: none;
}

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

.page-about .breadcrumb__current {
  color: var(--orange);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(44px, 11vw, 108px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  text-transform: none;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.8;
  color: rgba(245, 247, 244, 0.82);
}

.page-about .about-hero__meta {
  display: grid;
  gap: 16px;
  margin: clamp(12px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta-item {
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__meta-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--silver);
}

.page-about .about-hero__meta-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__meta-text {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 247, 244, 0.66);
}

.page-about .about-hero__ghost {
  position: absolute;
  right: -0.06em;
  bottom: -0.16em;
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(90px, 24vw, 260px);
  line-height: 0.8;
  letter-spacing: 0.02em;
  color: rgba(167, 179, 173, 0.06);
  -webkit-text-stroke: 1px rgba(167, 179, 173, 0.16);
  pointer-events: none;
  user-select: none;
}

.page-about .about-layout {
  display: block;
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* 索引栏 */
.page-about .about-rail {
  padding: 0 0 18px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--silver);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--white);
  border-color: var(--line-strong);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-rail__link:hover .about-rail__num {
  color: var(--white);
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-rail__link.is-active .about-rail__num,
.page-about .about-rail__link[aria-current="true"] .about-rail__num {
  color: var(--ink);
}

/* 区块卡片 */
.page-about .about-body {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-section {
  padding: clamp(24px, 4vw, 56px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-2);
}

.page-about .about-section--paper {
  background: var(--white);
  border-color: rgba(51, 68, 63, 0.12);
  color: var(--graphite);
}

.page-about .about-section--mist {
  background: var(--mist);
  border-color: rgba(51, 68, 63, 0.14);
  color: var(--graphite);
}

.page-about .about-section--dark {
  background:
    linear-gradient(160deg, rgba(47, 230, 200, 0.08), transparent 46%),
    var(--ink-2);
}

.page-about .about-section--band {
  background:
    linear-gradient(90deg, rgba(255, 107, 44, 0.14), transparent 42%),
    var(--ink-3);
  border-top: 2px solid var(--orange);
}

.page-about .about-section--start {
  background: var(--white);
  border-color: rgba(255, 107, 44, 0.4);
  color: var(--graphite);
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .eyebrow--cyan {
  color: var(--cyan);
}

.page-about .eyebrow--amber {
  color: var(--amber);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.04;
  letter-spacing: -0.015em;
}

.page-about .about-section--paper .about-section__title,
.page-about .about-section--mist .about-section__title,
.page-about .about-section--start .about-section__title {
  color: var(--ink);
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 247, 244, 0.78);
}

.page-about .about-section--paper .about-section__lede,
.page-about .about-section--mist .about-section__lede,
.page-about .about-section--start .about-section__lede {
  color: var(--graphite);
}

.page-about .about-section__footnote {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 247, 244, 0.76);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
}

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

.page-about .about-section--paper .prose p,
.page-about .about-section--mist .prose p,
.page-about .about-section--start .prose p {
  color: var(--graphite);
}

.page-about .about-cols {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-cols__note {
  padding: 18px 20px;
  border: 1px solid rgba(51, 68, 63, 0.16);
  border-radius: var(--radius-md);
  background: rgba(221, 229, 223, 0.55);
}

.page-about .about-note__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-note__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .about-note__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #4b6b5f;
}

/* 图片 */
.page-about .about-figure {
  position: relative;
  margin: clamp(22px, 4vw, 38px) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform 0.24s var(--ease), filter 0.24s var(--ease);
}

.page-about .about-figure:hover img {
  transform: translateY(-2px);
  filter: brightness(1.05);
}

.page-about .about-figure .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

/* 工序折叠 */
.page-about .stage-list {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .stage {
  border-bottom: 1px solid var(--line);
}

.page-about .stage__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .stage__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .stage__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 26px);
  letter-spacing: -0.01em;
}

.page-about .stage__hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--silver);
}

.page-about .stage__trigger:hover .stage__name {
  color: var(--orange);
}

.page-about .stage__plus,
.page-about .about-cert__plus {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
  color: var(--orange);
}

.page-about .stage__plus::before,
.page-about .stage__plus::after,
.page-about .about-cert__plus::before,
.page-about .about-cert__plus::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-about .stage__plus::after,
.page-about .about-cert__plus::after {
  transform: rotate(90deg);
}

.page-about .stage[data-open] .stage__plus::after,
.page-about .about-cert[data-open] .about-cert__plus::after {
  transform: rotate(0deg);
  opacity: 0;
}

.page-about .stage__panel {
  padding: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 247, 244, 0.8);
}

.page-about .stage__panel p {
  margin: 0 0 12px;
  max-width: 66ch;
}

.page-about .stage__deliverables {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .stage__deliverables li {
  position: relative;
  padding-left: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--amber);
}

.page-about .stage__deliverables li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

/* 团队与资质 */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

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

.page-about .about-team__content {
  display: grid;
  gap: 14px;
}

.page-about .about-stats {
  display: grid;
  gap: 12px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: var(--white);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(245, 247, 244, 0.72);
}

.page-about .about-cert {
  margin-top: 4px;
  border: 1px solid rgba(51, 68, 63, 0.2);
  border-radius: var(--radius-md);
  background: rgba(221, 229, 223, 0.5);
}

.page-about .about-cert__trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border: 0;
  background: none;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-cert__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
}

.page-about .about-cert__count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #4b6b5f;
}

.page-about .about-cert__panel {
  padding: 0 16px 16px;
}

.page-about .about-cert__panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-cert__panel li {
  padding: 8px 0 8px 18px;
  border-top: 1px solid rgba(51, 68, 63, 0.14);
  position: relative;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .about-cert__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1em;
  width: 8px;
  height: 8px;
  border: 1px solid var(--orange);
  border-radius: 2px;
}

/* 服务网络 */
.page-about .about-network {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-network__figure {
  display: grid;
  align-content: center;
  gap: 2px;
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: var(--white);
}

.page-about .about-network__big {
  font-family: var(--font-mono);
  font-size: clamp(56px, 12vw, 88px);
  line-height: 0.9;
  color: var(--orange);
}

.page-about .about-network__unit {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
}

.page-about .about-network__caption {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(245, 247, 244, 0.7);
}

.page-about .about-network__list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-network__item {
  padding: 14px 0;
  border-top: 1px solid rgba(51, 68, 63, 0.18);
}

.page-about .about-network__item:last-child {
  border-bottom: 1px solid rgba(51, 68, 63, 0.18);
}

.page-about .about-network__item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #4b6b5f;
}

.page-about .about-network__item dd {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-network__item strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--ink);
}

/* 协同与年轮 */
.page-about .about-parties {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  list-style: none;
}

.page-about .about-parties__item {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(11, 31, 26, 0.45);
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(245, 247, 244, 0.78);
}

.page-about .about-parties__role {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-timeline__item {
  display: grid;
  gap: 4px;
  padding-left: 18px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  margin-top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  transform: translateX(-4px);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 247, 244, 0.72);
}

/* 收束 */
.page-about .about-start {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

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

.page-about .about-start__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-start__side {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: var(--white);
}

.page-about .about-start__side-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .about-start__links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-start__links a {
  display: block;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--white);
  font-size: 13.5px;
  line-height: 1.6;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .about-start__links li:last-child a {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-start__links a:hover {
  color: var(--cyan);
}

/* 渐进增强：滚动渐显与折叠 */
:where(html.js-ready) .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

:where(html.js-ready) .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

:where(html.js-ready) .page-about .stage__panel,
:where(html.js-ready) .page-about .about-cert__panel {
  display: none;
}

:where(html.js-ready) .page-about .stage[data-open] .stage__panel,
:where(html.js-ready) .page-about .about-cert[data-open] .about-cert__panel {
  display: block;
}

/* 平板与桌面 */
@media (min-width: 680px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

  .page-about .about-network {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
    align-items: start;
  }

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

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-about .about-start {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    padding: 6px 0 0;
    margin-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-md);
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-figure--bleed {
    margin-right: calc(-1 * clamp(24px, 4vw, 56px));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure img,
  .page-about .about-rail__link,
  .page-about .stage__plus::before,
  .page-about .stage__plus::after,
  .page-about .about-cert__plus::before,
  .page-about .about-cert__plus::after {
    transition: none;
  }

  :where(html.js-ready) .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}