/* ===== 品牌文化页 ===== */
.page-about {
  --about-rail-w: 26px;
  --about-col-gap: 14px;
  --about-row-gap: clamp(42px, 6vw, 76px);
  --about-text: rgba(255, 255, 255, 0.82);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-top {
  padding-top: clamp(14px, 2.6vw, 26px);
}

.page-about .about-masthead {
  padding: clamp(18px, 3.6vw, 38px) 0 clamp(26px, 5vw, 46px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-masthead h1 {
  margin: 12px 0 18px;
  max-width: 22ch;
  font-size: clamp(30px, 6.2vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 66ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-text);
}

/* 章节骨架 */
.page-about .about-body {
  display: grid;
  gap: var(--about-row-gap);
  padding-top: clamp(32px, 5.6vw, 62px);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  gap: var(--about-col-gap);
  min-width: 0;
}

.page-about .chapter-rail {
  position: relative;
}

.page-about .chapter-rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 20px;
  bottom: calc(-1 * var(--about-row-gap));
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.5), rgba(53, 224, 200, 0.1));
}

.page-about .about-chapter:last-child .chapter-rail::before {
  bottom: auto;
  height: 26px;
}

.page-about .chapter-dot {
  display: block;
  width: 12px;
  height: 12px;
  margin: 10px auto 0;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 224, 200, 0.14);
}

.page-about .chapter-main {
  min-width: 0;
}

.page-about .chapter-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: rgba(53, 224, 200, 0.62);
  font-variant-numeric: tabular-nums;
}

.page-about .sec-title {
  margin: 0 0 14px;
  font-size: clamp(21px, 3.3vw, 34px);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .chapter-copy p,
.page-about .chapter-main > p,
.page-about .chapter-foot {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--about-text);
}

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

.page-about .chapter-main > p.chapter-num {
  margin-bottom: 8px;
  color: rgba(53, 224, 200, 0.62);
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1;
}

.page-about .chapter-foot {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, 0.45);
  padding-bottom: 1px;
}

.page-about .chapter-foot a:hover,
.page-about .chapter-foot a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 成长线 */
.page-about .about-timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .timeline-item {
  position: relative;
  padding: 2px 0 2px 18px;
  border-left: 2px solid rgba(53, 224, 200, 0.32);
}

.page-about .timeline-era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline-title {
  margin: 6px 0 6px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .timeline-item p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-text);
}

/* 图片 */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
  border-top: 1px solid var(--line-soft);
}

/* 团队分段切换 */
.page-about .about-tabs {
  margin-top: 24px;
}

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tabs .tab {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  padding: 9px 14px;
  font-family: var(--font-cn);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--slate);
  cursor: pointer;
  transition: color 200ms var(--ease), background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-tabs .tab:hover,
.page-about .about-tabs .tab:focus-visible {
  color: var(--white);
  background: var(--glass);
}

.page-about .about-tabs .tab.is-active {
  color: var(--white);
  background: var(--glass-strong);
  border-bottom-color: var(--cyan);
}

.page-about .about-tabs .tabpanel {
  display: block;
  padding-top: 20px;
}

[data-js="on"] .page-about .about-tabs .tabpanel:not(.is-active) {
  display: none;
}

.page-about .panel-lead {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--white);
}

.page-about .panel-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .panel-list li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .panel-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--orange);
}

/* 玻璃数据卡 */
.page-about .about-glass {
  margin-top: 26px;
  padding: 18px 18px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  backdrop-filter: blur(10px);
}

.page-about .about-export-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-export-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-export-list > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-export-list dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .about-export-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

/* 合作生态 */
.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: 4px;
}

.page-about .split-copy p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--about-text);
}

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

.page-about .about-figure--side {
  margin-top: 0;
}

/* 暖纸复核卡 */
.page-about .about-paper {
  margin-top: 6px;
  padding: clamp(20px, 3.4vw, 34px);
  border-radius: var(--r-lg);
  background: var(--paper);
  box-shadow: var(--shadow-paper);
}

.page-about .about-paper .paper-lead {
  margin: 0 0 14px;
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-paper p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(26, 26, 34, 0.82);
}

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

/* 结尾行动 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .about-export-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail-w: 78px;
    --about-col-gap: 40px;
  }

  .page-about .chapter-dot {
    width: 16px;
    height: 16px;
    margin-top: 14px;
    box-shadow: 0 0 0 7px rgba(53, 224, 200, 0.13), 0 0 26px rgba(53, 224, 200, 0.34);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 34px;
    align-items: start;
  }
}
</nul>