.page-about {
  background: var(--deep);
  color: var(--sand);
  --about-pad-y: clamp(52px, 8vw, 104px);
  --about-line: rgba(195, 214, 211, .28);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.012em;
  line-height: 1.18;
  margin: 0;
}

.page-about p { margin: 0; }
.page-about ul,
.page-about ol { margin: 0; padding: 0; list-style: none; }
.page-about figure { margin: 0; }
.page-about img { display: block; max-width: 100%; height: auto; }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(40px, 7vw, 72px)) 0 clamp(52px, 8vw, 96px);
  background:
    radial-gradient(88% 70% at 86% 0%, rgba(255, 106, 61, .18), transparent 60%),
    radial-gradient(70% 62% at 4% 100%, rgba(127, 201, 194, .14), transparent 62%),
    var(--deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 170px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(127, 201, 194, .09) 0 1px,
    transparent 1px 20px
  );
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000);
  mask-image: linear-gradient(to bottom, transparent, #000);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  align-items: end;
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-note);
  color: var(--mist);
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-crumb a {
  color: var(--shoal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.page-about .about-crumb__sep { opacity: .55; }
.page-about .about-crumb [aria-current="page"] { color: var(--sand); }

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 14px;
}

.page-about .about-eyebrow::before {
  content: "";
  flex: none;
  width: 20px;
  height: 1px;
  background: currentColor;
}

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

.page-about .about-hero h1 {
  font-size: var(--fs-display);
  max-width: 17em;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .about-hero__lede {
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(246, 240, 228, .82);
  max-width: var(--measure);
  margin-bottom: clamp(28px, 3.8vw, 42px);
}

.page-about .about-claims {
  max-width: 40em;
  border-top: 1px solid var(--about-line);
}

.page-about .about-claims li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: rgba(246, 240, 228, .9);
}

.page-about .about-claims li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: .62em;
  background: var(--lime);
  transform: rotate(45deg);
}

.page-about .about-hero__media {
  position: relative;
  border: 1px solid rgba(127, 201, 194, .3);
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.9) brightness(.92);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 44px;
  height: 44px;
  border-top: 2px solid var(--coral);
  border-right: 2px solid var(--coral);
  pointer-events: none;
}

/* ---------- 我们做的是什么 ---------- */
.page-about .about-what {
  background: var(--sand);
  color: var(--ink);
  padding: var(--about-pad-y) 0;
}

.page-about .about-what__grid {
  display: grid;
  gap: clamp(26px, 4vw, 58px);
}

@media (min-width: 900px) {
  .page-about .about-what__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

.page-about .about-h2 {
  font-size: var(--fs-h2);
  max-width: 20em;
}

.page-about .about-head { max-width: 48em; }

.page-about .about-head__sub {
  margin-top: 16px;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(246, 240, 228, .68);
  max-width: 42em;
}

.page-about .about-what .about-head__sub,
.page-about .about-upkeep .about-head__sub {
  color: rgba(8, 17, 15, .66);
}

.page-about .about-copy {
  font-size: var(--fs-body);
  line-height: 1.85;
  max-width: var(--measure);
}

.page-about .about-copy + .about-copy { margin-top: 20px; }

.page-about .about-copy--lead {
  font-size: var(--fs-h4);
  line-height: 1.75;
  font-weight: 700;
  color: var(--deep);
  max-width: 30em;
}

/* ---------- 栏目分工 ---------- */
.page-about .about-map {
  position: relative;
  padding: var(--about-pad-y) 0;
  background: var(--deep);
}

.page-about .about-map__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(30px, 4.4vw, 50px);
}

@media (min-width: 880px) {
  .page-about .about-map__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-map__cell--mission { grid-column: span 4; }
  .page-about .about-map__cell--guide { grid-column: span 8; min-height: 216px; }
  .page-about .about-map__cell--news { grid-column: span 5; }
  .page-about .about-map__cell--faq { grid-column: span 7; }
}

.page-about .about-map__cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid rgba(127, 201, 194, .3);
  background: linear-gradient(158deg, rgba(11, 90, 95, .52), rgba(5, 48, 58, .92));
  color: inherit;
  text-decoration: none;
  outline: 1px solid transparent;
  outline-offset: 2px;
  transition: border-color .2s var(--ease), background .2s var(--ease), outline-color .2s var(--ease);
}

.page-about .about-map__cell:hover,
.page-about .about-map__cell:focus-visible {
  border-color: var(--coral);
  outline-color: var(--coral);
  background: linear-gradient(158deg, rgba(11, 90, 95, .8), rgba(5, 48, 58, .96));
}

.page-about .about-map__no {
  font-size: var(--fs-note);
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .about-map__name {
  font-size: var(--fs-h3);
  font-weight: 900;
}

.page-about .about-map__desc {
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(246, 240, 228, .76);
  max-width: 42em;
}

.page-about .about-map__go {
  margin-top: auto;
  align-self: flex-end;
  font-family: var(--font-mono);
  font-size: var(--fs-h4);
  line-height: 1;
  color: var(--coral);
  transition: transform .2s var(--ease);
}

.page-about .about-map__cell:hover .about-map__go { transform: translateX(4px); }

.page-about .about-map__figure {
  margin-top: clamp(28px, 4vw, 46px);
  border: 1px solid var(--about-line);
}

.page-about .about-map__figure img {
  width: 100%;
  aspect-ratio: 11 / 7;
  object-fit: cover;
}

.page-about .about-map__figure figcaption {
  padding: 14px 18px;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: rgba(246, 240, 228, .6);
  border-top: 1px solid var(--about-line);
}

/* ---------- 版本与说明 ---------- */
.page-about .about-rhythm {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad-y) 0;
  background: var(--tide);
}

.page-about .about-rhythm::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(246, 240, 228, .055) 0 1px,
    transparent 1px 34px
  );
  pointer-events: none;
}

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

.page-about .about-tl {
  position: relative;
  margin-top: clamp(32px, 4.6vw, 56px);
  padding-left: 28px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(246, 240, 228, .5) 0 5px,
    transparent 5px 12px
  );
}

.page-about .about-tl__node {
  position: relative;
  padding-bottom: clamp(28px, 3.8vw, 44px);
}

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

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: .5em;
  width: 11px;
  height: 11px;
  background: var(--tide);
  border: 1px solid var(--shoal);
  transform: rotate(45deg);
  transition: box-shadow .2s var(--ease), background .2s var(--ease);
}

.page-about .about-tl__node--now::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(184, 255, 60, .16);
}

.page-about .about-tl__node:hover::before {
  box-shadow: 0 0 0 5px rgba(255, 106, 61, .2);
}

.page-about .about-tl__when {
  font-size: var(--fs-note);
  letter-spacing: .1em;
  color: var(--lime);
  margin-bottom: 8px;
}

.page-about .about-tl__title {
  font-size: var(--fs-h4);
  font-weight: 900;
  margin-bottom: 10px;
}

.page-about .about-tl__text {
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: rgba(246, 240, 228, .78);
  max-width: var(--measure);
}

.page-about .about-rhythm__figure {
  margin-top: clamp(32px, 4.6vw, 56px);
  border: 1px solid rgba(246, 240, 228, .2);
}

.page-about .about-rhythm__figure img {
  width: 100%;
  aspect-ratio: 11 / 6;
  object-fit: cover;
}

.page-about .about-rhythm__figure figcaption {
  padding: 13px 18px;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: rgba(246, 240, 228, .66);
  border-top: 1px solid rgba(246, 240, 228, .2);
}

/* ---------- 维护安排 ---------- */
.page-about .about-upkeep {
  background: var(--sand);
  color: var(--ink);
  padding: var(--about-pad-y) 0;
}

.page-about .about-upkeep__list {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4.4vw, 50px);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .about-upkeep__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-upkeep__list > li {
  background: var(--sand);
  padding: clamp(22px, 2.8vw, 32px);
}

.page-about .about-upkeep__no {
  display: block;
  font-size: var(--fs-note);
  letter-spacing: .12em;
  color: var(--coral);
  margin-bottom: 12px;
}

.page-about .about-upkeep__title {
  font-size: var(--fs-h4);
  font-weight: 900;
  margin-bottom: 10px;
}

.page-about .about-upkeep__text {
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: rgba(8, 17, 15, .72);
}

/* ---------- 收束 ---------- */
.page-about .about-stay {
  position: relative;
  padding: var(--about-pad-y) 0;
  background:
    radial-gradient(80% 100% at 100% 0%, rgba(255, 106, 61, .16), transparent 58%),
    var(--deep);
}

.page-about .about-stay__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

@media (min-width: 900px) {
  .page-about .about-stay__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: end;
  }
}

.page-about .about-stay .about-h2 { margin-bottom: 20px; }

.page-about .about-stay .about-copy {
  color: rgba(246, 240, 228, .8);
}

.page-about .about-stay__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .about-stay__text-link {
  font-size: var(--fs-sm);
  color: var(--shoal);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(127, 201, 194, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-stay__text-link:hover {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

/* ---------- 首屏浮现 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero [data-reveal] {
    animation: about-reveal .55s var(--ease) both;
  }
  .page-about .about-hero__copy > .about-eyebrow { animation-delay: .05s; }
  .page-about .about-hero__copy > h1 { animation-delay: .12s; }
  .page-about .about-hero__copy > .about-hero__lede { animation-delay: .19s; }
  .page-about .about-hero__copy > .about-claims { animation-delay: .26s; }
  .page-about .about-hero__media { animation: about-reveal .6s var(--ease) .08s both; }

  @keyframes about-reveal {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__cell,
  .page-about .about-map__go,
  .page-about .about-tl__node::before {
    transition: none;
  }
  .page-about .about-map__cell:hover .about-map__go { transform: none; }
}