.page-about {
  --about-gutter: clamp(0.9rem, 3.5vw, 2.5rem);
  --about-border: var(--hair);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .about-top {
  padding-block: clamp(1rem, 3vw, 2rem) clamp(1.5rem, 4vw, 3rem);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.25rem, 3.5vw, 2.5rem);
  padding-top: clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--about-border);
}

.page-about .about-kicker {
  margin: 0 0 0.85rem;
  font-size: 0.76rem;
  letter-spacing: 0.34em;
  color: var(--red);
}

.page-about .page-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.012em;
  line-height: 1.16;
  max-width: 22ch;
}

.page-about .page-intro {
  margin: 1.1rem 0 0;
  max-width: 38em;
  line-height: 1.85;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .about-hero-side {
  margin: 0;
  color: var(--sky);
  align-self: start;
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding-block: clamp(2.25rem, 6vw, 4.75rem);
}

.page-about .section--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(0.7rem, 2vw, 1.35rem);
  row-gap: 0.3rem;
  align-items: start;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-border);
  margin-bottom: clamp(1.4rem, 3.5vw, 2.5rem);
}

.page-about .section--ink .chapter-head {
  border-bottom-color: var(--hair-dark);
}

.page-about .chapter-no {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .section--ink .chapter-no {
  color: var(--gold);
}

.page-about .chapter-tagline {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  color: var(--sky);
}

.page-about .chapter-title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: -0.005em;
}

.page-about .chapter-lede {
  margin: 0 0 clamp(1.4rem, 3vw, 2.2rem);
  max-width: 42em;
  line-height: 1.9;
  font-size: 0.98rem;
}

.page-about .section--ink .chapter-lede {
  color: rgba(247, 243, 236, 0.82);
}

.page-about .chapter-copy p {
  margin: 0 0 1rem;
  line-height: 1.88;
  max-width: 38em;
}

.page-about .chapter-copy p:last-of-type {
  margin-bottom: 0;
}

.page-about .chapter-copy--lead {
  margin-top: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .chapter-copy--dark p {
  color: rgba(247, 243, 236, 0.82);
}

.page-about .chapter-copy--dark .btn {
  margin-top: 1.5rem;
}

.page-about .chapter-tail {
  margin: clamp(1.5rem, 3vw, 2.2rem) 0 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.78);
}

.page-about .chapter-tail a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--hair-dark);
  padding-bottom: 1px;
  transition: border-color 220ms var(--ease);
}

.page-about .chapter-tail a:hover {
  border-bottom-color: var(--gold);
}

/* ---------- 图片 ---------- */

.page-about .chapter-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--about-border);
  background: var(--paper-2);
  overflow: hidden;
}

.page-about .section--ink .chapter-figure {
  border-color: var(--hair-dark);
  background: var(--ink-2);
}

.page-about .chapter-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .chapter-figure--full img {
  aspect-ratio: 14 / 9;
}

.page-about .chapter-figure-cap {
  display: block;
  padding: 0.6rem 0.9rem;
  border-top: 1px solid var(--about-border);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--gold-deep);
}

.page-about .section--ink .chapter-figure-cap {
  border-top-color: var(--hair-dark);
  color: var(--gold);
}

/* ---------- 双栏错位 ---------- */

.page-about .chapter-split {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

/* ---------- 三条线 ---------- */

.page-about .line-stack {
  border-top: 1px solid var(--hair-dark);
}

.page-about .line-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.85rem, 2.4vw, 1.75rem);
  padding-block: clamp(1.05rem, 2.6vw, 1.6rem);
  border-bottom: 1px solid var(--hair-dark);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .line-item:hover,
.page-about .line-item:focus-within {
  border-bottom-color: var(--red-hot);
  background: rgba(211, 174, 91, 0.06);
}

.page-about .line-index {
  font-family: var(--font-num);
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  line-height: 1;
  color: var(--gold);
  padding-top: 0.15em;
}

.page-about .line-title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  color: var(--paper);
}

.page-about .line-desc {
  margin: 0;
  line-height: 1.85;
  font-size: 0.95rem;
  color: rgba(247, 243, 236, 0.8);
}

.page-about .line-more {
  margin: 0.6rem 0 0;
  font-size: 0.88rem;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.6);
}

/* ---------- 条形图 ---------- */

.page-about .about-chart {
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
  padding: clamp(0.95rem, 2.5vw, 1.6rem);
  border: 1px solid var(--hair-dark);
}

.page-about .about-chart-title {
  margin: 0 0 1rem;
  font-size: 0.74rem;
  letter-spacing: 0.3em;
  color: var(--sky);
}

.page-about .about-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .chart-label text {
  fill: var(--paper-2);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .chart-bar rect {
  fill: var(--gold);
  transition: fill 220ms var(--ease);
}

.page-about .about-chart:hover .chart-bar rect {
  fill: var(--gold-deep);
}

.page-about .chart-value text {
  fill: var(--gold);
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 600;
}

.page-about .chart-axis {
  stroke: var(--hair-dark);
  stroke-width: 1;
}

/* ---------- 复查节奏 ---------- */

.page-about .rhythm {
  position: relative;
  padding-left: 1.6rem;
  border-left: 1px solid var(--hair-dark);
}

.page-about .rhythm-item {
  position: relative;
  padding-block: clamp(0.85rem, 2vw, 1.25rem);
  outline: none;
}

.page-about .rhythm-item::before {
  content: "";
  position: absolute;
  left: -1.98rem;
  top: 1.55rem;
  width: 7px;
  height: 7px;
  border: 1px solid var(--gold);
  background: var(--ink);
  transition: background-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .rhythm-item:hover::before,
.page-about .rhythm-item:focus-within::before {
  background: var(--red-hot);
  border-color: var(--red-hot);
  transform: scale(1.35);
}

.page-about .rhythm-title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--paper);
}

.page-about .rhythm-desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(247, 243, 236, 0.75);
}

.page-about .rhythm-detail {
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(247, 243, 236, 0.55);
}

/* ---------- 联系节奏 ---------- */

.page-about .channel-list {
  list-style: none;
  margin: clamp(1.3rem, 3vw, 2rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-border);
}

.page-about .channel-item {
  padding-block: 0.95rem;
  border-bottom: 1px solid var(--about-border);
  transition: border-color 220ms var(--ease);
}

.page-about .channel-item:hover {
  border-bottom-color: var(--red-hot);
}

.page-about .channel-key {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--red);
}

.page-about .channel-val {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(11, 7, 8, 0.78);
}

/* ---------- 合作 ---------- */

.page-about .partner-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 1rem;
  padding-bottom: clamp(1.1rem, 2.5vw, 1.6rem);
  margin-bottom: clamp(1.2rem, 2.8vw, 1.8rem);
  border-bottom: 1px solid var(--hair-dark);
}

.page-about .partner-num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(3rem, 9vw, 5.4rem);
  font-weight: 600;
  line-height: 0.9;
  color: var(--gold);
}

.page-about .partner-cap {
  margin: 0;
  flex: 1 1 14rem;
  max-width: 34em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.78);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 780px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: clamp(1.5rem, 4vw, 3.5rem);
  }

  .page-about .about-hero-side {
    justify-self: end;
    padding-top: 0.4rem;
  }

  .page-about .chapter-split {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .chapter-split > .chapter-copy {
    grid-column: 1 / span 6;
    padding-top: 0.4rem;
  }

  .page-about .chapter-split > .chapter-figure {
    grid-column: 8 / span 5;
  }

  .page-about .chapter-split--media-left > .chapter-figure {
    grid-column: 1 / span 5;
  }

  .page-about .chapter-split--media-left > .chapter-copy {
    grid-column: 7 / span 6;
    padding-top: 0;
  }

  .page-about .line-item {
    grid-template-columns: 3.5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-about .rhythm {
    padding-left: 2.2rem;
  }

  .page-about .rhythm-item::before {
    left: -2.58rem;
  }

  .page-about .about-chart {
    max-width: 620px;
  }
}

@media (min-width: 1080px) {
  .page-about .chapter-split > .chapter-copy {
    grid-column: 1 / span 5;
  }

  .page-about .chapter-split > .chapter-figure {
    grid-column: 7 / span 6;
  }

  .page-about .chapter-split--media-left > .chapter-figure {
    grid-column: 1 / span 6;
  }

  .page-about .chapter-split--media-left > .chapter-copy {
    grid-column: 8 / span 5;
  }
}

/* ---------- 悬停展开（仅精确指针设备） ---------- */

@media (hover: hover) and (pointer: fine) {
  .page-about .line-more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 300ms var(--ease), opacity 260ms var(--ease),
      margin-top 300ms var(--ease);
  }

  .page-about .line-item:hover .line-more,
  .page-about .line-item:focus-within .line-more {
    max-height: 12em;
    margin-top: 0.6rem;
    opacity: 1;
  }

  .page-about .rhythm-detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 300ms var(--ease), opacity 260ms var(--ease),
      margin-top 300ms var(--ease);
  }

  .page-about .rhythm-item:hover .rhythm-detail,
  .page-about .rhythm-item:focus-within .rhythm-detail {
    max-height: 10em;
    margin-top: 0.55rem;
    opacity: 1;
  }
}
</main>
<<<END>>>