.page-about {
  --about-rail: 92px;
  --about-hair: 1px solid var(--trace);
  background: var(--mist);
  color: var(--ink);
  padding-bottom: clamp(48px, 8vw, 116px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(34px, 5vw, 84px);
  padding-bottom: clamp(30px, 4.5vw, 68px);
  overflow: hidden;
}

.page-about .about-hero__ghost {
  position: absolute;
  right: clamp(0px, 1vw, 28px);
  bottom: clamp(-18px, -1vw, 0px);
  z-index: 0;
  font-family: var(--font-display);
  font-size: clamp(110px, 24vw, 300px);
  line-height: .8;
  letter-spacing: -.05em;
  color: var(--deep);
  opacity: .05;
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(14px, 2vw, 24px);
  color: var(--lake);
  font-size: 12px;
  letter-spacing: .26em;
}

.page-about .about-hero__title {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(18px, 2.6vw, 34px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(54px, 13vw, 158px);
  line-height: .9;
  letter-spacing: -.035em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  position: relative;
  z-index: 1;
  max-width: var(--prose);
  margin: 0;
  padding-left: clamp(14px, 2vw, 24px);
  border-left: 2px solid var(--lake);
  color: var(--rock);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.92;
}

.page-about .about-hero__toc {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(18px, 2.2vw, 26px);
  border-top: var(--about-hair);
}

.page-about .about-hero__toc a {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--trace);
  border-radius: var(--radius-pill);
  color: var(--deep);
  font-size: 13px;
  text-decoration: none;
  transition: border-color .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}

.page-about .about-hero__toc a:hover,
.page-about .about-hero__toc a:focus-visible {
  border-color: var(--lake);
  background: var(--chalk);
  color: var(--lake);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
  padding-top: clamp(46px, 7vw, 92px);
  padding-bottom: clamp(46px, 7vw, 92px);
  border-top: var(--about-hair);
  scroll-margin-top: 96px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .section__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.28;
  letter-spacing: -.012em;
  color: var(--ink);
}

.page-about .section__lede {
  max-width: var(--prose);
  margin: 0 0 clamp(24px, 3.4vw, 44px);
  color: var(--rock);
  line-height: 1.9;
}

/* ---------- 01 品牌自述 ---------- */
.page-about .about-statement {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
}

.page-about .about-statement__media {
  margin: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.page-about .about-statement__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-statement__text {
  max-width: 100%;
  min-width: 0;
}

.page-about .about-statement__text p {
  margin: 0 0 1.15em;
  color: var(--ink);
  line-height: 1.92;
}

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

/* ---------- 02 六个区域 ---------- */
.page-about .region-map {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(20px, 2.6vw, 34px);
}

.page-about .region-map line {
  stroke: var(--trace);
  stroke-width: 1.4;
}

.page-about .region-map circle {
  fill: var(--lake);
}

.page-about .region-map text {
  fill: var(--rock);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: .1em;
}

.page-about .about-regions__filter {
  margin-bottom: clamp(18px, 2.4vw, 30px);
}

.page-about .region-list {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 40px);
  padding: 0;
  border-top: var(--about-hair);
}

.page-about .region {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding: clamp(16px, 2vw, 24px) clamp(10px, 1.4vw, 18px);
  border-bottom: var(--about-hair);
  border-left: 2px solid transparent;
  transition: border-left-color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .region:hover,
.page-about .region:focus-within {
  border-left-color: var(--indigo);
  background: var(--chalk);
}

.page-about .region:focus-visible {
  outline: none;
  border-left-color: var(--indigo);
  background: var(--chalk);
  box-shadow: inset 0 0 0 2px var(--lake);
}

.page-about .region__idx {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .region__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.32;
  color: var(--deep);
}

.page-about .region__scope {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  color: var(--rock);
  font-size: 15px;
  line-height: 1.86;
}

.page-about .about-regions__empty {
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  padding: 18px 20px;
  border-left: 2px solid var(--orange);
  background: var(--chalk);
  color: var(--rock);
  line-height: 1.8;
}

.page-about .about-regions__note {
  margin: 0 0 clamp(24px, 3vw, 40px);
}

.page-about .about-regions__note p {
  margin: 0;
  line-height: 1.88;
}

.page-about .about-regions__note .aside-note__label {
  margin-bottom: 6px;
}

.page-about .about-regions__figure {
  margin: 0;
  max-width: 640px;
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.page-about .about-regions__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 03 三块构成 ---------- */
.page-about .pillar-list {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 40px);
  padding: 0;
}

.page-about .pillar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.4vw, 28px) 0;
  border-top: var(--about-hair);
}

.page-about .pillar:last-child {
  border-bottom: var(--about-hair);
}

.page-about .pillar__key {
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 23px);
  letter-spacing: .02em;
  color: var(--lake);
}

.page-about .pillar__text {
  margin: 0;
  max-width: 64ch;
  color: var(--ink);
  line-height: 1.88;
}

.page-about .pillar__link {
  justify-self: start;
  color: var(--rock);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--trace);
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .pillar__link::after {
  content: " →";
}

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

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

.page-about .about-pillars__note p {
  margin: 0;
  line-height: 1.88;
}

.page-about .about-pillars__note .aside-note__label {
  margin-bottom: 6px;
}

/* ---------- 04 维护节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
}

.page-about .about-cadence__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.page-about .about-cadence__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

.page-about .cadence {
  padding-left: clamp(14px, 1.6vw, 20px);
  border-left: 2px solid var(--gold);
}

.page-about .cadence__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.4;
  color: var(--deep);
}

.page-about .cadence__desc {
  margin: 0;
  color: var(--rock);
  font-size: 15px;
  line-height: 1.88;
}

.page-about .about-cadence__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(28px, 3.6vw, 46px);
}

.page-about .about-cadence__link {
  margin: clamp(16px, 2vw, 24px) 0 0;
  color: var(--rock);
  font-size: 14px;
  line-height: 1.82;
}

.page-about .about-cadence__link a {
  color: var(--lake);
}

/* ---------- 05 误读澄清 ---------- */
.page-about .about-clarify {
  max-width: 900px;
}

/* ---------- 尾部出口 ---------- */
.page-about .about-cta {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  margin-top: clamp(12px, 2vw, 28px);
  padding: clamp(26px, 4vw, 50px);
  background: var(--deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
}

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

/* ---------- 显现 ---------- */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 820px) {
  .page-about .region {
    grid-template-columns: 64px 132px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .region__scope {
    grid-column: auto;
    margin: 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-statement {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }
}

@media (min-width: 760px) {
  .page-about .pillar {
    grid-template-columns: 150px minmax(0, 1fr) auto;
    gap: 28px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 4vw, 64px);
  }

  .page-about .about-chapter__rail {
    display: block;
    padding-top: 6px;
  }

  .page-about .about-chapter__rail::after {
    content: "";
    display: block;
    width: 1px;
    height: clamp(64px, 10vw, 160px);
    margin-top: 20px;
    background: linear-gradient(to bottom, var(--trace), transparent);
  }

  .page-about .about-cadence {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .about-cadence__media {
    position: sticky;
    top: 120px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-regions__figure {
    max-width: 700px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region,
  .page-about .about-hero__toc a,
  .page-about .pillar__link,
  .js .page-about [data-reveal],
  .js .page-about [data-reveal].is-revealed {
    transition: none;
    transform: none;
    opacity: 1;
  }
}