/* ===== 品牌历程 /history/ · 页面专属样式 ===== */
.page-about {
  --about-rail: clamp(64px, 9vw, 128px);
  --about-gap: clamp(16px, 3vw, 46px);
  --about-stage: var(--teal);
  --about-band-1: #1E6E6A;
  --about-band-2: #2B7C6C;
  --about-band-3: #4C8264;
  --about-band-4: #93794C;
  --about-band-5: #D4713A;
  --about-band-6: var(--orange);
  padding-bottom: clamp(32px, 5vw, 72px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 48px) 0 clamp(28px, 4vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .about-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-kicker span {
  padding: 3px 10px;
  border: 1px solid rgba(53, 230, 208, .38);
  border-radius: var(--radius-pill);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--cream);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-family: var(--font-sans);
  font-size: clamp(.98rem, 1.4vw, 1.0625rem);
  line-height: 1.82;
  color: var(--silver);
  max-width: 34em;
}

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

.page-about .about-hero__panel {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.page-about .about-panel__head {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat__label {
  font-family: var(--font-sans);
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--silver);
}

/* ---------- 首屏内目录 ---------- */
.page-about .about-toc {
  margin-top: clamp(22px, 3vw, 30px);
  padding-top: clamp(18px, 2.4vw, 24px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-toc__head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--bronze);
}

.page-about .about-toc__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  font-family: var(--font-sans);
  font-size: .875rem;
  line-height: 1.5;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-toc__link span {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--bronze);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--line);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--cyan);
}

.page-about .about-toc__link[aria-current="true"] span {
  color: var(--cyan);
}

/* ---------- 长卷与章节 ---------- */
.page-about .lifeline {
  padding-top: clamp(16px, 2.6vw, 34px);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: clamp(30px, 5vw, 60px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .lifeline > .chapter:first-child {
  border-top: 0;
}

.page-about .chapter__rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 16px;
}

.page-about .chapter__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background: var(--about-stage);
  transition: height .28s ease;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--cream);
}

.page-about .chapter__era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  line-height: 1.6;
  letter-spacing: .08em;
  color: var(--silver);
  text-transform: uppercase;
}

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

.page-about .chapter__body p {
  margin: 0 0 1.1em;
  max-width: 34em;
  font-family: var(--font-sans);
  font-size: clamp(.98rem, 1.2vw, 1.0625rem);
  line-height: 1.82;
  color: var(--silver);
}

.page-about .chapter__body > :last-child {
  margin-bottom: 0;
}

.page-about .chapter__title {
  margin: 0 0 clamp(12px, 1.6vw, 18px);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: -.005em;
  color: var(--cream);
}

.page-about .chapter__body p.chapter__lede {
  margin-bottom: 1.5em;
  font-size: clamp(1.05rem, 1.6vw, 1.18rem);
  line-height: 1.72;
  color: var(--cream);
  opacity: .9;
}

.page-about .sub-title {
  display: inline-block;
  margin: clamp(24px, 3vw, 34px) 0 12px;
  padding-bottom: 4px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  letter-spacing: .04em;
  color: var(--cream);
  border-bottom: 2px solid rgba(53, 230, 208, .55);
}

.page-about .chapter__body p.note {
  margin-top: clamp(20px, 2.6vw, 30px);
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--bronze);
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--silver);
}

.page-about .about-linkline {
  margin-top: clamp(16px, 2.2vw, 24px);
}

.page-about .about-linkline a,
.page-about .chapter__body p a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-linkline a:hover,
.page-about .chapter__body p a:hover {
  color: var(--cream);
}

/* ---------- 阶段色 ---------- */
.page-about .lifeline > .chapter:nth-of-type(1) { --about-stage: var(--about-band-1); }
.page-about .lifeline > .chapter:nth-of-type(2) { --about-stage: var(--about-band-2); }
.page-about .lifeline > .chapter:nth-of-type(3) { --about-stage: var(--about-band-3); }
.page-about .lifeline > .chapter:nth-of-type(4) { --about-stage: var(--about-band-4); }
.page-about .lifeline > .chapter:nth-of-type(5) { --about-stage: var(--about-band-5); }
.page-about .lifeline > .chapter:nth-of-type(6) { --about-stage: var(--about-band-6); }

/* ---------- 版本切换 ---------- */
.page-about .tabs {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(16px, 2vw, 22px);
}

.page-about .tabs__bar .tab {
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(20, 36, 58, .55);
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--silver);
  cursor: pointer;
  transition: color .18s ease, background .18s ease, border-color .18s ease;
}

.page-about .tabs__bar .tab:hover {
  color: var(--cream);
  border-color: rgba(53, 230, 208, .5);
}

.page-about .tabs__bar .tab[aria-selected="true"] {
  color: var(--navy);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tabpanel {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--glass);
  backdrop-filter: blur(10px);
}

.page-about .tabpanel[hidden] {
  display: none;
}

.page-about .tabpanel .chip {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
}

.page-about .tabpanel h3 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  line-height: 1.3;
  color: var(--cream);
}

.page-about .tabpanel p {
  margin: 0;
  max-width: 34em;
  font-size: clamp(.95rem, 1.2vw, 1rem);
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 数字网格 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr));
  gap: clamp(18px, 2.4vw, 30px);
  margin: clamp(20px, 3vw, 30px) 0 clamp(6px, 1vw, 12px);
}

.page-about .stat-grid .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding-left: 14px;
  border-left: 2px solid rgba(53, 230, 208, .32);
}

.page-about .stat-grid .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .stat-grid .stat__label {
  font-family: var(--font-sans);
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  max-width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
}

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

.page-about .media-frame__caption {
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: .75rem;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--silver);
  background: rgba(20, 36, 58, .6);
}

/* ---------- 收束带 ---------- */
.page-about .about-close {
  margin: clamp(30px, 5vw, 64px) 0 clamp(20px, 3vw, 40px);
  padding: clamp(30px, 4.4vw, 56px) clamp(24px, 4vw, 52px);
  background:
    linear-gradient(118deg, rgba(15, 58, 64, .92) 0%, rgba(10, 21, 38, .9) 48%, rgba(255, 122, 41, .18) 100%);
  clip-path: polygon(0 var(--slant), 100% 0, 100% calc(100% - var(--slant)), 0 100%);
}

.page-about .about-close__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-close__text {
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  max-width: 32em;
  font-family: var(--font-sans);
  font-size: clamp(.98rem, 1.2vw, 1.05rem);
  line-height: 1.8;
  color: var(--silver);
}

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

/* ---------- 桌面端：左栏编年 ---------- */
@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 var(--about-gap);
    padding: clamp(44px, 6vw, 84px) 0;
    align-items: start;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-left: 18px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .chapter__rail::before {
    top: 0;
    transform: none;
    width: 3px;
    height: 100%;
    min-height: 36px;
  }

  .page-about .chapter:hover .chapter__rail::before {
    height: 100%;
  }

  .page-about .chapter__num {
    font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  }

  .page-about .chapter__era {
    font-size: .75rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-hero__panel {
    margin-top: clamp(18px, 3vw, 44px);
  }
}

@media (min-width: 1180px) {
  .page-about .chapter__body p {
    font-size: 1.0625rem;
  }
}

/* ---------- 窄屏收拢 ---------- */
@media (max-width: 560px) {
  .page-about .tabs__bar .tab {
    flex: 1 1 auto;
    text-align: center;
    padding: 9px 12px;
    font-size: .75rem;
  }

  .page-about .about-hero__stats {
    gap: 18px 10px;
  }

  .page-about .about-close {
    clip-path: polygon(0 var(--slant), 100% 0, 100% 100%, 0 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter__rail::before,
  .page-about .tabs__bar .tab,
  .page-about .about-toc__link {
    transition: none;
  }
}
<<<END>>>