.page-about {
  --about-gutter: clamp(18px, 4vw, 56px);
  --about-gap: clamp(20px, 3vw, 40px);
  background: var(--silver);
  color: var(--ink);
  padding-bottom: clamp(56px, 8vw, 104px);
  font-family: var(--font-body);
}

.page-about .container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-about .breadcrumbs {
  padding-block: clamp(16px, 3vw, 28px) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--ink-mute);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--line);
}

.page-about .breadcrumb-list a {
  color: var(--blue);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover {
  text-decoration: underline;
}

/* 首屏 */
.page-about .about-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(24px, 5vw, 64px) clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-top__main > * {
  max-width: 42ch;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 16px;
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  color: var(--ink);
}

.page-about .lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 28px;
  max-width: 54ch;
}

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

/* 书签岛 */
.page-about .about-island {
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  border-radius: 3px;
  padding: 22px 20px 24px;
  box-shadow: var(--shadow-island);
}

.page-about .exhibit-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-ink);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .exhibit-label::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-island__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.32rem;
  line-height: 1.3;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-island__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-mute);
  margin: 0 0 16px;
}

.page-about .about-island__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-island__list li {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-island__list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 180ms var(--ease), padding-inline-start 180ms var(--ease);
}

.page-about .about-island__list a:hover,
.page-about .about-island__list a:focus-visible {
  color: var(--blue);
  padding-inline-start: 6px;
}

/* 通用章节 */
.page-about .section {
  padding-block: clamp(36px, 6vw, 76px);
  border-top: 1px solid var(--line-soft);
}

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 0 0 16px;
  color: var(--ink);
}

/* 品牌主张 */
.page-about .about-claim__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-claim__text > * {
  min-width: 0;
}

.page-about .about-claim__text p {
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.page-about .about-claim__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-claim__points li {
  background: var(--silver);
  padding: 14px 2px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-claim__points .mono {
  display: inline-block;
  min-width: 96px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold-ink);
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-mute);
  margin-top: 10px;
}

.page-about .about-claim__figure {
  border-left: 2px solid var(--blue);
  padding-left: 14px;
}

/* 时间线筛选 */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .filter-btn {
  min-height: 44px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--blue-light);
  color: var(--blue);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.page-about .filter-btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .filter-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  margin-inline-start: auto;
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(26px, 4vw, 44px);
  border-left: 1px solid var(--line);
}

.page-about .about-timeline .timeline-item {
  position: relative;
  padding-block: clamp(16px, 2.6vw, 26px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline .timeline-item:last-child {
  border-bottom: 0;
}

.page-about .about-timeline .timeline-item::before {
  content: "";
  position: absolute;
  top: calc(clamp(16px, 2.6vw, 26px) + 7px);
  inset-inline-start: calc((clamp(26px, 4vw, 44px) + 4px) * -1);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--silver);
}

.page-about [data-filter-item][hidden] {
  display: none;
}

.page-about .about-timeline__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 8px;
}

.page-about .about-timeline h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  max-width: 62ch;
}

.page-about .about-journey__figure {
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line-soft);
}

/* 团队 */
.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats li {
  background: var(--paper);
  padding: 20px 18px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--blue);
  margin-bottom: 6px;
}

.page-about .about-stats__label {
  display: block;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-mute);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-sub {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.06rem;
  line-height: 1.45;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-about .about-team__col p {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 16px 0 0;
}

.page-about .about-chips {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-chips li {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 8px 12px;
}

.page-about .about-chips--blue li {
  border-color: var(--blue-light);
  color: var(--blue);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-steps li {
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold);
  padding: 12px 14px;
  font-size: 14px;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-steps .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold-ink);
}

.page-about .about-team__figure {
  margin-top: clamp(26px, 4vw, 44px);
}

/* 资质与生态 */
.page-about .about-proof__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-proof__block {
  border: 1px solid var(--line-soft);
  background: var(--paper);
  padding: 20px 18px;
  border-radius: 3px;
}

.page-about .about-proof__block--eco {
  background: var(--gold-soft);
  border-color: rgba(195, 146, 74, 0.45);
}

.page-about .about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-honors li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold-ink);
  background: var(--gold-soft);
  border: 1px solid rgba(195, 146, 74, 0.5);
  padding: 8px 12px;
  border-radius: 2px;
  position: relative;
}

.page-about .about-proof__block--eco .about-honors li {
  background: #fff;
}

.page-about .about-proof__lead {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.page-about .about-proof__lead .mono {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold-ink);
  margin-inline-end: 4px;
}

/* 选择对比 */
.page-about .about-compare__list {
  border-top: 1px solid var(--line-soft);
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-compare details {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-compare summary {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 52px;
  padding-block: 12px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(0.98rem, 2.2vw, 1.1rem);
  color: var(--ink);
  list-style: none;
}

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

.page-about .about-compare summary .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  font-weight: 400;
  color: var(--blue);
}

.page-about .about-compare summary::after {
  content: "+";
  margin-inline-start: auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-compare details[open] summary::after {
  content: "−";
}

.page-about .about-compare summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .about-compare details p {
  margin: 0 0 20px;
  padding-inline-start: 30px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 64ch;
}

/* 收束区 */
.page-about .about-next {
  background: var(--ink);
  color: var(--paper);
  border-radius: 3px;
  padding: clamp(24px, 4.6vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-next__eyebrow {
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.32rem, 3.2vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: #fff;
}

.page-about .about-next__copy p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(248, 250, 251, 0.78);
  max-width: 58ch;
}

.page-about .about-next__acts {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.page-about .about-next__ghost {
  border-color: rgba(248, 250, 251, 0.4);
  color: #fff;
  background: transparent;
}

.page-about .about-next__ghost:hover {
  border-color: #fff;
  background: rgba(248, 250, 251, 0.08);
}

.page-about .about-next__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gold);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.page-about .about-next__link:hover {
  text-decoration: underline;
}

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

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

  .page-about .about-island__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 14px;
    border-top: 0;
  }

  .page-about .about-island__list li {
    border-top: 1px solid var(--line-soft);
  }
}

@media (min-width: 860px) {
  .page-about .about-top {
    grid-template-columns: minmax(0, 1fr) 296px;
  }

  .page-about .about-island {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

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

  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

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

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

  .page-about .about-proof__block--eco {
    grid-column: 1 / -1;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: center;
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
  }

  .page-about .about-proof__block--eco {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-island__list a,
  .page-about .filter-btn {
    transition: none;
  }
}