/* ===== 品牌价值页 · page-about ===== */

.page-about {
  --about-paper-ink: #1B2140;
  --about-gap: clamp(20px, 3vw, 40px);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 52px) 0 clamp(30px, 4.4vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(920px 460px at 8% -12%, rgba(37, 225, 212, .16), transparent 60%),
    radial-gradient(780px 480px at 96% 6%, rgba(255, 122, 47, .13), transparent 62%);
}

.page-about .crumbs {
  margin-bottom: clamp(16px, 2vw, 26px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: end;
}

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

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--ff-display);
  font-size: clamp(32px, 6.4vw, 72px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 42em;
  font-size: clamp(16px, 1.1vw, 18px);
  line-height: 1.85;
  color: var(--c-paper);
}

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

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 6px;
  border: 1px solid var(--line-strong);
  background: rgba(19, 28, 74, .55);
  box-shadow: 10px 10px 0 rgba(5, 8, 27, .55);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 3.2vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts > li {
  background: rgba(10, 16, 48, .78);
  padding: clamp(14px, 1.8vw, 24px);
  min-width: 0;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--ff-mono);
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
  margin-bottom: 10px;
}

.page-about .about-hero__label {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 主体 ---------- */

.page-about .about-body {
  padding: clamp(28px, 4.6vw, 72px) 0 clamp(36px, 5.4vw, 88px);
}

.page-about .chapter {
  padding: clamp(26px, 3.8vw, 54px) 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 110px;
}

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

.page-about .chapter__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 2.6vw, 34px);
  border-bottom: 1px solid var(--line);
}

.page-about .chapter__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 48px;
  height: 2px;
  background: var(--c-cyan);
  transition: width var(--t-slow);
}

.page-about .chapter:hover .chapter__head::after {
  width: 108px;
}

.page-about .chapter__no {
  flex: none;
  font-family: var(--ff-mono);
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--ff-display);
  font-size: clamp(21px, 2.9vw, 36px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: .005em;
  color: var(--c-paper);
}

.page-about .chapter__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

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

.page-about .chapter__main p {
  margin: 0 0 1.05em;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-paper);
  overflow-wrap: break-word;
}

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

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

/* ---------- 纸卡旁注 ---------- */

.page-about .note-card {
  align-self: start;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--c-bone);
  color: var(--about-paper-ink);
  border: 1px solid rgba(10, 16, 48, .18);
  box-shadow: 8px 8px 0 rgba(5, 8, 27, .5);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.page-about .note-card:hover {
  transform: translateY(-2px);
  box-shadow: 10px 12px 0 rgba(5, 8, 27, .62);
}

.page-about .note-card__title {
  margin: 0 0 10px;
  font-family: var(--ff-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: #0A1030;
}

.page-about .note-card p {
  margin: 0 0 .85em;
  font-size: 15px;
  line-height: 1.78;
  color: #232A46;
}

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

.page-about .tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 14px;
}

.page-about .tagcloud .tag {
  font-size: 12px;
}

/* ---------- 两条节奏 ---------- */

.page-about .rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 20px;
  border: 1px solid var(--line);
  background: var(--line-soft);
}

.page-about .rhythm__card {
  padding: clamp(18px, 2.4vw, 32px);
  background: var(--c-panel);
  border-top: 3px solid var(--c-cyan);
  transition: transform var(--t-fast);
}

.page-about .rhythm__card--deep {
  border-top-color: var(--c-orange);
}

.page-about .rhythm__card:hover {
  transform: translateY(-2px);
}

.page-about .rhythm__kicker {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 13px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--c-orange);
}

.page-about .rhythm__card--fast .rhythm__kicker {
  color: var(--c-cyan);
}

.page-about .rhythm__title {
  margin: 0 0 10px;
  font-family: var(--ff-display);
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .rhythm__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-rock);
}

/* ---------- 时间线 ---------- */

.page-about .era {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-about .era__item {
  position: relative;
  padding: 24px 0 24px 22px;
  border-bottom: 1px solid var(--line-soft);
  min-width: 0;
}

.page-about .era__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: var(--era, var(--c-cyan));
  opacity: .85;
}

.page-about .era__item:nth-child(1) { --era: var(--c-cyan); }
.page-about .era__item:nth-child(2) { --era: var(--c-amber); }
.page-about .era__item:nth-child(3) { --era: var(--c-moss); }
.page-about .era__item:nth-child(4) { --era: var(--c-orange); }

.page-about .era__year {
  display: block;
  font-family: var(--ff-mono);
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--era, var(--c-cyan));
  margin-bottom: 10px;
}

.page-about .era__title {
  margin: 0 0 8px;
  font-family: var(--ff-display);
  font-size: clamp(17px, 1.7vw, 21px);
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .era__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-rock);
}

.page-about .era__note {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 9px;
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--c-rock);
  border: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .era__item:hover .era__note {
  color: var(--c-ink);
  background: var(--era, var(--c-cyan));
  border-color: var(--era, var(--c-cyan));
}

/* ---------- 旁注配图 ---------- */

.page-about .sidefig {
  margin: 0;
  border: 1px solid var(--line);
  background: rgba(19, 28, 74, .5);
  padding: 6px;
}

.page-about .sidefig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.04) contrast(1.03);
}

.page-about .sidefig figcaption {
  padding: 12px 6px 6px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 合作 ---------- */

.page-about .partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .partners__copy .btn {
  margin-top: 6px;
}

.page-about .sidefig--tall img {
  aspect-ratio: 5 / 6;
}

/* ---------- 三个尺度 ---------- */

.page-about .scale {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line-soft);
}

.page-about .scale__item {
  padding: clamp(18px, 2.4vw, 30px);
  background: rgba(19, 28, 74, .6);
  min-width: 0;
  transition: background-color var(--t-fast);
}

.page-about .scale__item:hover {
  background: rgba(19, 28, 74, .92);
}

.page-about .scale__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--ff-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--c-amber);
}

.page-about .scale__title {
  margin: 0 0 10px;
  font-family: var(--ff-display);
  font-size: clamp(18px, 1.9vw, 23px);
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .scale__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-rock);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  padding: clamp(34px, 5vw, 76px) 0;
  background: var(--c-deep);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
  align-items: end;
}

.page-about .about-cta h2 {
  margin: 10px 0 14px;
  font-family: var(--ff-display);
  font-size: clamp(26px, 4vw, 46px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--c-paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-rock);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .era__item {
    padding: 30px 20px 26px 0;
    border-bottom: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .era__item::before {
    top: -1px;
    left: 0;
    width: 44px;
    height: 3px;
    opacity: 1;
  }

  .page-about .era__item::after {
    content: "";
    position: absolute;
    top: -6px;
    left: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--era, var(--c-cyan));
    box-shadow: 0 0 0 4px var(--c-ink);
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, auto);
  }
}

@media (min-width: 940px) {
  .page-about .chapter__body {
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, .82fr);
    align-items: start;
  }

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

  .page-about .partners {
    grid-template-columns: minmax(0, 1.4fr) minmax(240px, .8fr);
  }
}

@media (max-width: 939px) {
  .page-about .sidefig--tall img {
    aspect-ratio: 4 / 3;
  }
}

.page-about img {
  max-width: 100%;
  height: auto;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}