.page-about {
  --about-shadow: 0 42px 90px -56px rgba(0, 0, 0, .85);
  background: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .story-open {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  color: var(--paper);
  padding: 2rem 0 3.25rem;
  overflow: hidden;
}

.page-about .story-open::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: min(88%, 760px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 42% 42%, rgba(201, 162, 39, .34), rgba(201, 162, 39, .06) 48%, transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.page-about .story-open::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -40%;
  width: min(70%, 560px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(15, 107, 79, .3), transparent 66%);
  pointer-events: none;
  z-index: -1;
}

.page-about .story-open-band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--crimson), var(--gold) 32%, var(--jade-bright) 68%, var(--crimson-bright));
  opacity: .92;
}

.page-about .story-open .breadcrumb-link {
  color: rgba(245, 240, 230, .68);
}

.page-about .story-open .breadcrumb-link[aria-current="page"],
.page-about .story-open .breadcrumb-link:hover {
  color: var(--gold-bright);
}

.page-about .story-open-grid {
  display: grid;
  gap: 2.25rem;
  margin-top: 1.75rem;
}

.page-about .story-open h1 {
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 6.4vw, 3.75rem);
  line-height: 1.16;
  letter-spacing: .01em;
  margin: .55rem 0 0;
  color: var(--paper);
}

.page-about .story-hl {
  color: var(--gold-bright);
  position: relative;
}

.page-about .story-hl::after {
  content: "";
  display: block;
  height: 3px;
  width: 62%;
  margin-top: .5rem;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .story-open-lead {
  margin: 1.4rem 0 0;
  max-width: 40ch;
  font-size: clamp(1rem, 2.5vw, 1.12rem);
  line-height: 1.85;
  color: rgba(245, 240, 230, .84);
}

.page-about .story-open-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.9rem;
}

.page-about .story-open-foot {
  margin: 1.35rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: rgba(201, 162, 39, .78);
}

.page-about .story-open-figure {
  box-shadow: var(--about-shadow);
  width: 100%;
  max-width: 420px;
}

/* ---------- 章节 ---------- */
.page-about .story-chapters {
  background: var(--paper);
}

.page-about .chapter-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
}

.page-about .chapter {
  display: grid;
  gap: .65rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--gold-line);
}

.page-about .chapter:last-child {
  border-bottom: 1px solid var(--gold-line);
}

.page-about .chapter-no {
  font-family: var(--font-mono);
  font-size: .86rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3.4vw, 1.42rem);
  line-height: 1.5;
  margin: 0;
  color: var(--ink-900);
}

.page-about .chapter-text p {
  margin: 0;
  color: var(--muted);
  line-height: 1.92;
  font-size: .97rem;
}

/* ---------- 数字条 ---------- */
.page-about .story-figures {
  background: var(--ink-850);
  padding: 2.5rem 0;
}

.page-about .figure-strip {
  display: grid;
  gap: 1.5rem;
  border-left: 3px solid var(--gold);
  padding-left: 1.25rem;
}

.page-about .figure-cell {
  display: grid;
  gap: .3rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--gold-line-soft);
}

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

.page-about .figure-num {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 8vw, 2.9rem);
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .figure-label {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: rgba(245, 240, 230, .9);
}

.page-about .figure-note {
  font-size: .82rem;
  color: rgba(245, 240, 230, .56);
}

/* ---------- 场景 ---------- */
.page-about .story-scene-grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .story-scene-figure {
  box-shadow: var(--about-shadow);
}

.page-about .story-scene-copy p {
  margin: 1rem 0 0;
  color: var(--muted);
  line-height: 1.95;
  font-size: .97rem;
}

.page-about .scene-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .scene-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--paper-ink);
  line-height: 1.8;
  font-size: .94rem;
}

.page-about .scene-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 11px;
  height: 2px;
  background: var(--gold);
}

.page-about .story-scene-link {
  margin-top: 1.6rem;
}

.page-about .story-inline-link {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--jade);
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: .18rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .story-inline-link:hover,
.page-about .story-inline-link:focus-visible {
  color: var(--gold-deep);
  border-color: var(--gold);
}

/* ---------- 长期承诺 ---------- */
.page-about .story-promise {
  background: var(--paper-2);
}

.page-about .promise-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.page-about .promise-item {
  position: relative;
  padding: 1.5rem 1.4rem 1.6rem;
  background: var(--paper);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  border-left: 3px solid var(--crimson);
}

.page-about .promise-title {
  font-family: var(--font-display);
  font-size: 1.16rem;
  margin: 0 0 .7rem;
  color: var(--ink-900);
}

.page-about .promise-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.88;
  font-size: .93rem;
}

/* ---------- 开始 ---------- */
.page-about .story-start {
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .story-start-inner {
  display: grid;
  gap: 2.25rem;
  align-items: center;
}

.page-about .story-start .eyebrow {
  color: var(--gold);
}

.page-about .story-start .section-title {
  color: var(--paper);
}

.page-about .start-steps {
  list-style: none;
  counter-reset: step;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .start-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: baseline;
  padding-bottom: .95rem;
  border-bottom: 1px dashed var(--gold-line-soft);
}

.page-about .start-steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .start-no {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--gold-bright);
}

.page-about .start-text {
  color: rgba(245, 240, 230, .84);
  line-height: 1.82;
  font-size: .95rem;
}

.page-about .story-start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.9rem;
}

.page-about .story-start-figure {
  width: 100%;
  max-width: 360px;
  box-shadow: 0 34px 70px -44px rgba(201, 162, 39, .55);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .story-open {
    padding: 2.75rem 0 4rem;
  }

  .page-about .figure-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-left: 0;
    border-top: 3px solid var(--gold);
    padding-left: 0;
    padding-top: 1.6rem;
    gap: 2rem;
  }

  .page-about .figure-cell {
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--gold-line-soft);
    padding-left: 1.15rem;
  }

  .page-about .figure-cell:first-child {
    border-left: 0;
    padding-left: 0;
  }

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

@media (min-width: 900px) {
  .page-about .story-open {
    padding: 3.25rem 0 5rem;
  }

  .page-about .story-open-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: 3.5rem;
    align-items: end;
    margin-top: 2.75rem;
  }

  .page-about .story-open-figure {
    max-width: none;
    justify-self: end;
  }

  .page-about .chapter {
    grid-template-columns: 92px minmax(0, .95fr) minmax(0, 1.25fr);
    gap: 1.75rem;
    align-items: baseline;
    padding: 2.1rem 0;
  }

  .page-about .chapter-no {
    padding-top: .35rem;
  }

  .page-about .story-scene-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 3.25rem;
  }

  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
  }

  .page-about .story-start-inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 3.5rem;
  }

  .page-about .story-start-figure {
    max-width: none;
    justify-self: end;
  }
}

@media (min-width: 1180px) {
  .page-about .story-open-grid {
    gap: 4.5rem;
  }

  .page-about .chapter {
    grid-template-columns: 120px minmax(0, .9fr) minmax(0, 1.3fr);
    gap: 2.25rem;
  }
}