/* ============================================================
   品牌文化 /culture/  —  页面作用域 .page-about
   ============================================================ */

.page-about {
  --about-line: rgba(110, 122, 115, .42);
  --about-rail: 92px;
  background: var(--yq-ink);
  color: var(--yq-paper);
}

.page-about .about-chapter {
  scroll-margin-top: 132px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(112px, 15vw, 178px);
  padding-bottom: clamp(36px, 5vw, 64px);
}

.page-about .about-hero__eyebrow {
  margin: clamp(22px, 3vw, 38px) 0 0;
  color: var(--yq-cyan);
  font-family: var(--yq-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(40px, 8.4vw, 116px);
  line-height: 1.02;
  letter-spacing: -.02em;
  font-weight: 200;
  color: var(--yq-white);
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: clamp(24px, 3vw, 36px) 0 0;
  font-size: clamp(16px, 1.2vw, 19px);
  line-height: 1.9;
  color: var(--yq-paper);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: clamp(32px, 4vw, 46px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--about-line);
  list-style: none;
}

.page-about .about-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--yq-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--yq-paper-mid);
}

.page-about .about-hero__stat b {
  font-family: var(--yq-font-mono);
  font-size: clamp(20px, 2.2vw, 27px);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--yq-cyan);
}

.page-about .about-hero__figure {
  margin: clamp(36px, 5vw, 68px) 0 0;
  border-top: 3px solid var(--yq-turf);
  border-bottom: 3px solid var(--yq-turf);
  background: var(--yq-ink-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.86) contrast(1.06);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  list-style: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding-bottom: 3px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--yq-paper-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--yq-ease), border-color .2s var(--yq-ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link[aria-current="location"] {
  color: var(--yq-cyan);
  border-bottom-color: var(--yq-cyan);
}

.page-about .about-index__num {
  font-family: var(--yq-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--yq-line);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link[aria-current="location"] .about-index__num {
  color: var(--yq-cyan-soft);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding-top: clamp(58px, 8vw, 116px);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

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

.page-about .about-chapter__index {
  font-family: var(--yq-font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--yq-cyan);
}

.page-about .about-chapter__tick {
  display: block;
  width: 34px;
  height: 2px;
  background: var(--yq-turf);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(20px, 2.4vw, 28px);
  font-size: clamp(29px, 4.5vw, 56px);
  line-height: 1.14;
  letter-spacing: -.012em;
  font-weight: 300;
  color: var(--yq-white);
}

.page-about .about-chapter__content p {
  max-width: 64ch;
  margin: 0 0 20px;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.92;
  color: var(--yq-paper);
}

/* ---------- 纸面强调面板 ---------- */

.page-about .about-panel {
  max-width: 68ch;
  margin: clamp(28px, 3.6vw, 42px) 0 0;
  padding: clamp(22px, 2.8vw, 34px) clamp(20px, 3vw, 36px);
  background: var(--yq-paper);
  color: var(--yq-on-paper);
  border-left: 4px solid var(--yq-orange);
  box-shadow: 9px 9px 0 rgba(255, 90, 43, .16);
}

.page-about .about-panel p {
  margin: 0;
  max-width: none;
  font-size: clamp(17px, 1.35vw, 20px);
  line-height: 1.82;
  color: var(--yq-on-paper);
}

/* ---------- 数字条 ---------- */

.page-about .about-figures {
  display: grid;
  gap: 1px;
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-figures li {
  padding: 22px 20px;
  background: var(--yq-ink-2);
}

.page-about .about-figures b {
  display: block;
  font-family: var(--yq-font-mono);
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 600;
  letter-spacing: -.015em;
  color: var(--yq-cyan);
}

.page-about .about-figures span {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--yq-paper-mid);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  margin: clamp(30px, 4vw, 50px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 26px;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 4px 0 0 24px;
  border-left: 2px solid var(--yq-turf);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--yq-ink);
  border: 2px solid var(--yq-line);
  border-radius: 50%;
  transition: border-color .22s var(--yq-ease), background .22s var(--yq-ease);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--yq-cyan);
}

.page-about .about-timeline__item.is-current {
  border-left-color: var(--yq-cyan);
}

.page-about .about-timeline__item.is-current::before {
  background: var(--yq-cyan);
  border-color: var(--yq-cyan);
  box-shadow: 0 0 0 5px rgba(43, 227, 192, .16);
}

.page-about .about-timeline__ver {
  display: block;
  font-family: var(--yq-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--yq-paper-mid);
}

.page-about .about-timeline__item.is-current .about-timeline__ver {
  color: var(--yq-cyan);
}

.page-about .about-timeline__name {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--yq-white);
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--yq-paper-mid);
  opacity: .55;
  transform: translateY(3px);
  transition: opacity .26s var(--yq-ease), transform .26s var(--yq-ease);
}

.page-about .about-timeline__item:hover .about-timeline__note,
.page-about .about-timeline__item:focus-within .about-timeline__note,
.page-about .about-timeline__item.is-current .about-timeline__note {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 插图 ---------- */

.page-about .about-figure {
  margin: clamp(32px, 4.4vw, 56px) 0 clamp(28px, 3.4vw, 42px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  filter: saturate(.88) contrast(1.05);
}

.page-about .about-figure--wide img {
  border-left: 0;
  border-right: 0;
}

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--yq-paper-mid);
}

/* ---------- 作者数字行 ---------- */

.page-about .about-meters {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 46px;
  margin: clamp(26px, 3.2vw, 38px) 0 clamp(24px, 3vw, 34px);
  padding: 20px 0 0;
  border-top: 1px solid var(--about-line);
  list-style: none;
}

.page-about .about-meters li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-meters b {
  font-family: var(--yq-font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  letter-spacing: -.015em;
  color: var(--yq-white);
}

.page-about .about-meters span {
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--yq-paper-mid);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-cadence {
  display: grid;
  gap: 1px;
  margin: clamp(28px, 3.6vw, 44px) 0 clamp(28px, 3.4vw, 40px);
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-cadence__item {
  padding: 24px 22px;
  background: var(--yq-ink-2);
  transition: background .22s var(--yq-ease);
}

.page-about .about-cadence__item:hover {
  background: var(--yq-turf);
}

.page-about .about-cadence__when {
  display: inline-block;
  font-family: var(--yq-font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--yq-amber);
}

.page-about .about-cadence__what {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.35;
  color: var(--yq-white);
}

.page-about .about-cadence__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--yq-paper-mid);
}

/* ---------- 去向 ---------- */

.page-about .about-next {
  margin-top: clamp(64px, 9vw, 124px);
  padding: clamp(48px, 6.5vw, 88px) 0 clamp(72px, 8vw, 112px);
  background: var(--yq-ink-2);
  border-top: 3px solid var(--yq-turf);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.14;
  letter-spacing: -.012em;
  font-weight: 300;
  color: var(--yq-white);
}

.page-about .about-next__lede {
  max-width: 56ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.88;
  color: var(--yq-paper-mid);
}

.page-about .about-next__list {
  display: grid;
  gap: 1px;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-next__cell {
  display: flex;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  padding: 24px 22px;
  background: var(--yq-ink);
  text-decoration: none;
  transition: background .22s var(--yq-ease), box-shadow .22s var(--yq-ease);
}

.page-about .about-next__link:hover {
  background: var(--yq-turf);
  box-shadow: inset 0 0 0 1px var(--yq-cyan);
}

.page-about .about-next__label {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--yq-white);
}

.page-about .about-next__link:hover .about-next__label {
  color: var(--yq-cyan);
}

.page-about .about-next__desc {
  font-size: 13px;
  line-height: 1.72;
  color: var(--yq-paper-mid);
}

/* ---------- 中等屏 ---------- */

@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 62px);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 10px;
  }

  .page-about .about-chapter__tick {
    width: 2px;
    height: 62px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    padding-top: 6px;
  }

  .page-about .about-timeline__item {
    padding: 26px 20px 0 0;
    border-left: 0;
    border-top: 2px solid var(--yq-turf);
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -7px;
  }

  .page-about .about-timeline__item.is-current {
    border-top-color: var(--yq-cyan);
  }
}

@media (min-width: 1100px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* ---------- 动效收敛 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__note,
  .page-about .about-index__link,
  .page-about .about-next__link,
  .page-about .about-cadence__item,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-timeline__note {
    transform: none;
  }
}
<<<END>>>