.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .about-eyebrow {
  color: var(--flare);
  margin: 0 0 .5rem;
}

.page-about .about-eyebrow--ink {
  color: var(--mist-mid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--mist-deep);
  color: var(--paper);
  padding-block: clamp(1.1rem, 3.6vw, 1.8rem) clamp(2rem, 6vw, 3.4rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--clay) 0 26px, transparent 26px 52px);
  opacity: .85;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-crumbs {
  color: var(--mist-pale);
  margin-bottom: .9rem;
}

.page-about .about-crumbs a {
  color: var(--flare);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .about-crumb-sep {
  margin-inline: .45rem;
  color: var(--mist-mid);
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: .35rem 0 0;
  max-width: 18em;
  text-wrap: balance;
}

.page-about .about-lead {
  margin: 1rem 0 0;
  max-width: 40em;
  color: var(--mist-pale);
  font-size: 1rem;
  line-height: 1.78;
}

.page-about .about-index {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.4rem;
  margin: 1.4rem 0 0;
  padding: 0;
}

.page-about .about-index li {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding-left: .7rem;
  border-left: 2px solid var(--flare);
}

.page-about .about-index-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.45rem;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-index-key {
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--mist-pale);
}

.page-about .about-ticket {
  margin-top: 1.6rem;
  text-decoration: none;
  color: var(--ink);
  display: inline-flex;
  align-items: stretch;
  max-width: 22rem;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-ticket:hover,
.page-about .about-ticket:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-ticket-hover);
}

.page-about .about-ticket:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: 3px;
}

.page-about .about-ticket-body,
.page-about .about-ticket .ticket-body {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding-block: .55rem;
  padding-inline: .8rem 1rem;
}

.page-about .about-ticket-kicker {
  font-size: .66rem;
  letter-spacing: .16em;
  color: var(--clay);
  text-transform: uppercase;
}

.page-about .about-ticket-title {
  font-size: .92rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-hero-figure {
  margin: 0;
  background: var(--clay);
  padding: clamp(.8rem, 2.2vw, 1.4rem);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 3px solid var(--paper);
  filter: saturate(.92) contrast(1.06);
}

.page-about .about-hero-figure .media-caption {
  margin-top: .6rem;
  color: var(--paper);
  font-size: .76rem;
  line-height: 1.6;
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: .2rem 0 0;
  text-wrap: balance;
}

.page-about .about-h2--light {
  color: var(--paper);
}

.page-about .about-h3 {
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
  margin: .55rem 0 .4rem;
}

.page-about .about-intro {
  margin: .85rem 0 0;
  max-width: 44em;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 流程 ---------- */
.page-about .about-flow-section {
  background: var(--paper);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-step {
  background: var(--paper);
  border: 1px solid var(--relay);
  border-left: 4px solid var(--clay);
  border-radius: var(--radius);
  box-shadow: var(--shadow-ticket);
  margin-top: .9rem;
}

.page-about .about-step[open] {
  border-left-color: var(--mist-mid);
  background: #fffdf7;
}

.page-about .about-step > summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: .75rem;
  padding: .9rem 1rem;
  font-weight: 700;
  font-size: .96rem;
  line-height: 1.45;
}

.page-about .about-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step > summary:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: -2px;
}

.page-about .about-step-no {
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  background: var(--stub);
  border: 1px solid var(--ink);
  font-size: .78rem;
  color: var(--ink);
}

.page-about .about-step-mark {
  width: .7rem;
  height: .7rem;
  border-right: 2px solid var(--mist-mid);
  border-bottom: 2px solid var(--mist-mid);
  transform: rotate(45deg);
  transition: transform .25s var(--ease);
}

.page-about .about-step[open] .about-step-mark {
  transform: rotate(-135deg);
}

.page-about .about-step-body {
  padding: 0 1rem 1rem;
  border-top: 1px dashed var(--relay);
  margin-top: .1rem;
}

.page-about .about-step-body p {
  margin: .8rem 0 .6rem;
  line-height: 1.8;
  font-size: .95rem;
}

.page-about .about-deliverables {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .35rem;
}

.page-about .about-deliverables li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-deliverables li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .45rem;
  height: .45rem;
  background: var(--clay-lit);
}

.page-about .about-flow-side {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-side-media {
  margin: 0;
  background: var(--mist-pale);
  border: 1px solid var(--relay);
  border-radius: var(--radius);
  padding: .55rem;
  box-shadow: var(--shadow-ticket);
}

.page-about .about-side-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
  filter: saturate(.9);
}

.page-about .about-side-media .media-caption {
  margin: .5rem .2rem .1rem;
  font-size: .76rem;
  line-height: 1.6;
  color: var(--relay);
}

.page-about .about-side-note {
  background: var(--mist-deep);
  color: var(--mist-pale);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  transform: translateY(-.35rem);
}

.page-about .about-side-note-title {
  margin: 0 0 .45rem;
  color: var(--flare);
  font-size: .74rem;
  letter-spacing: .16em;
}

.page-about .about-side-note p:last-child {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
}

/* ---------- 档案 ---------- */
.page-about .about-archive {
  background: var(--mist-pale);
  border-block: 1px solid var(--relay);
}

.page-about .about-archive-head {
  max-width: 52rem;
}

.page-about .about-archive-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.page-about .about-archive-card {
  padding: 1rem 1.1rem 1.15rem;
  box-shadow: var(--shadow-ticket);
  border: 1px solid var(--relay);
}

.page-about .about-archive-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
}

.page-about .about-archive-card .plate-label {
  display: inline-block;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--paper);
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-team-copy .about-team-link {
  margin-top: 1.2rem;
  display: inline-block;
}

.page-about .about-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-team-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .9rem;
  align-items: center;
  background: var(--stub);
  border-left: 4px solid var(--clay);
  border-radius: var(--radius);
  padding: .8rem 1rem;
}

.page-about .about-team-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team-txt {
  font-size: .92rem;
  line-height: 1.7;
}

.page-about .about-team-txt strong {
  display: block;
  font-size: .96rem;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  background: var(--mist-deep);
  color: var(--paper);
  padding-bottom: 0;
}

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

.page-about .about-stage-band {
  position: relative;
  margin-top: 1.6rem;
  padding-block: clamp(1.6rem, 4vw, 2.4rem) clamp(2rem, 5vw, 3rem);
  overflow: hidden;
}

.page-about .about-stage-band > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
  filter: saturate(.7) contrast(1.1);
  pointer-events: none;
}

.page-about .about-stage-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 51, 80, .82), rgba(15, 51, 80, .96));
  pointer-events: none;
}

.page-about .about-stage-band .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: .9rem;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: 4px;
}

.page-about .about-stage {
  flex: 0 0 78%;
  scroll-snap-align: start;
  background: rgba(248, 244, 236, .06);
  border: 1px solid rgba(214, 227, 234, .34);
  border-top: 3px solid var(--flare);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.15rem;
}

.page-about .about-stage-year {
  margin: 0;
  color: var(--flare);
  font-size: .82rem;
  letter-spacing: .12em;
}

.page-about .about-stage-name {
  margin: .5rem 0 .45rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-stage p:last-child {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist-pale);
}

.page-about .about-scroll-hint {
  margin: .7rem 0 0;
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--mist-pale);
}

/* ---------- 覆盖与规划 ---------- */
.page-about .about-reach {
  background: var(--paper);
}

.page-about .about-reach-grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  margin-top: 1.5rem;
}

.page-about .about-stat {
  background: var(--mist-deep);
  color: var(--paper);
  border-radius: var(--radius);
  padding: .85rem 1rem 1rem;
  border-bottom: 4px solid var(--clay);
}

.page-about .about-stat-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .about-stat-key {
  margin: .35rem 0 0;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--mist-pale);
}

.page-about .about-reach-side {
  background: var(--mist-pale);
  border: 1px solid var(--relay);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow-ticket);
  align-self: start;
}

.page-about .about-reach-side > .about-h3 {
  margin-top: 0;
}

.page-about .about-plan-list {
  list-style: none;
  margin: .6rem 0 1rem;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-about .about-plan-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .65rem;
  font-size: .9rem;
  line-height: 1.7;
}

.page-about .about-plan-list li span {
  color: var(--clay);
  font-size: .78rem;
  padding-top: .18rem;
}

.page-about .about-ticket--side {
  display: flex;
  width: 100%;
  max-width: none;
  margin-top: .6rem;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  background: var(--clay);
  color: var(--paper);
  padding-block: clamp(1.8rem, 5vw, 2.8rem);
}

.page-about .about-close-inner {
  display: grid;
  gap: 1.1rem;
  align-items: center;
}

.page-about .about-close-line {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 3vw, 1.45rem);
  line-height: 1.5;
  letter-spacing: -0.005em;
  max-width: 34em;
}

.page-about .about-close-btn {
  justify-self: start;
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  transition: opacity .55s var(--ease), transform .55s var(--ease);
  transition-delay: calc(var(--reveal-order, 0) * 90ms);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

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

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

  .page-about .about-close-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 2.4rem;
  }

  .page-about .about-hero-figure {
    margin-top: 2.6rem;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-reach-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow-x: visible;
    gap: 1.1rem;
  }

  .page-about .about-stage {
    flex: none;
  }

  .page-about .about-scroll-hint {
    display: none;
  }

  .page-about .about-stage {
    margin-top: 0;
  }

  .page-about .about-stage:nth-child(2) {
    margin-top: 1.1rem;
  }

  .page-about .about-stage:nth-child(3) {
    margin-top: 2.2rem;
  }

  .page-about .about-stage:nth-child(4) {
    margin-top: 3.3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-ticket {
    transition: opacity .01ms linear;
    transform: none;
  }

  .page-about .about-ticket:hover,
  .page-about .about-ticket:focus-visible {
    transform: none;
  }
}

.page-about {
  --reveal-order: 0.3s;
}