/* ========== 品牌自述 / page-about ========== */
.page-about {
  position: relative;
  background: var(--bg-deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -130px;
  width: 360px;
  height: 360px;
  background: linear-gradient(150deg, rgba(43, 230, 200, .30), rgba(43, 230, 200, 0) 64%);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -110px;
  bottom: -150px;
  width: 300px;
  height: 300px;
  background: linear-gradient(24deg, rgba(255, 107, 74, .22), rgba(255, 107, 74, 0) 70%);
  clip-path: polygon(0 22%, 100% 0, 74% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  color: var(--mint);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15em;
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: .86;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  background: var(--bg-stand);
  padding: 14px 16px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-hero__facts .num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__facts li:nth-child(2) .num,
.page-about .about-hero__facts li:nth-child(4) .num {
  color: var(--coral);
}

/* ---------- 主体与章节轨道 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: 12px;
  padding-bottom: 56px;
}

.page-about .about-rail {
  padding: 8px 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-rail__list .num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--text);
  border-color: var(--mint);
  background: rgba(43, 230, 200, .08);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: 38px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 26px;
}

.page-about .about-chapter__head {
  max-width: 62ch;
}

.page-about .about-chapter__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.page-about .about-chapter__eyebrow .num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: var(--mint);
  letter-spacing: 0;
}

.page-about .about-chapter h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 5.4vw, 2.15rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-chapter h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-chapter a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 230, 200, .45);
}

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

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

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-stand);
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 01 发展历程 ---------- */
.page-about .about-history {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-history__media img {
  aspect-ratio: 16 / 11;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--mint), var(--coral));
  opacity: .75;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--mint);
  box-shadow: 0 0 0 4px rgba(43, 230, 200, .12);
}

.page-about .about-timeline__item:nth-child(3)::before,
.page-about .about-timeline__item:nth-child(4)::before {
  border-color: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .14);
}

.page-about .about-timeline__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--coral);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  margin: 6px 0 0;
  font-size: 17px;
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-timeline__more {
  margin-top: 10px;
}

.page-about .about-timeline__more summary {
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--mint);
}

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

.page-about .about-timeline__more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .about-timeline__more[open] summary::before {
  content: "– ";
}

.page-about .about-timeline__more summary:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-radius: 6px;
}

.page-about .about-timeline__more p {
  margin: 10px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--mint);
  background: var(--bg-stand);
  border-radius: 0 12px 12px 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 02 可视化实验室 ---------- */
.page-about .about-split {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-points__item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(43, 230, 200, .10), rgba(43, 230, 200, 0) 68%);
}

.page-about .about-points__item:nth-child(3) {
  border-left-color: var(--coral);
  background: linear-gradient(90deg, rgba(255, 107, 74, .10), rgba(255, 107, 74, 0) 68%);
}

.page-about .about-points__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-split__note {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-split__media img {
  aspect-ratio: 5 / 3;
}

/* ---------- 03 团队与排班 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-team li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  grid-template-rows: auto auto;
  align-items: center;
  gap: 6px 16px;
}

.page-about .about-team__num {
  grid-row: span 2;
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: var(--text);
}

.page-about .about-team__name {
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-team__bar {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: rgba(143, 166, 196, .18);
  overflow: hidden;
}

.page-about .about-team__bar span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--mint);
}

.page-about .about-team li:nth-child(1) .about-team__bar span { width: 37%; }
.page-about .about-team li:nth-child(2) .about-team__bar span { width: 24%; background: var(--mint-soft); }
.page-about .about-team li:nth-child(3) .about-team__bar span { width: 21%; background: var(--coral); }
.page-about .about-team li:nth-child(4) .about-team__bar span { width: 18%; background: var(--coral-soft); }

.page-about .about-shifts {
  margin-top: 28px;
}

.page-about .about-shifts__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-shifts__bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-shifts__seg {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg-stand);
  position: relative;
  overflow: hidden;
}

.page-about .about-shifts__seg::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--muted);
}

.page-about .about-shifts__seg--mint::before { background: var(--mint); }
.page-about .about-shifts__seg--coral::before { background: var(--coral); }

.page-about .about-shifts__seg strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.page-about .about-shifts__seg span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-shifts__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 04 案例合集 ---------- */
.page-about .about-cases__media {
  margin-top: 26px;
}

.page-about .about-cases__media img {
  aspect-ratio: 2 / 1;
}

.page-about .about-cases {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-case {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-stand);
  overflow: hidden;
}

.page-about .about-case::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--mint-soft);
}

.page-about .about-case--mint::after { background: var(--mint); }
.page-about .about-case--coral::after { background: var(--coral); }

.page-about .about-case__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-case p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-cases__note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 05 数据与合作 ---------- */
.page-about .about-coop {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-coop__item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass-blue);
  backdrop-filter: blur(6px);
}

.page-about .about-coop__item h3 {
  color: var(--mint);
}

.page-about .about-coop__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-coop__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 数据年报 ---------- */
.page-about .about-report {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 24px 20px;
}

.page-about .about-report__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-report__stat .num {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 14vw, 4.6rem);
  font-weight: 900;
  line-height: .92;
  letter-spacing: -0.02em;
  color: var(--coral);
  font-variant-numeric: tabular-nums;
}

.page-about .about-report__stat span:last-child {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-report__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
  opacity: .88;
}

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

.page-about .about-report__link {
  font-size: 14px !important;
  color: var(--muted) !important;
  opacity: 1 !important;
}

/* ---------- 收尾入口 ---------- */
.page-about .about-chapter--start {
  padding-bottom: 24px;
}

.page-about .about-start__title {
  margin: 0;
  font-size: clamp(1.4rem, 5vw, 1.9rem);
  font-weight: 800;
  line-height: 1.2;
}

.page-about .about-start__lead {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-start__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 动效 ---------- */
.page-about .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s ease;
}

.page-about .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 48px 0 52px;
  }

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

  .page-about .about-shifts__bar {
    grid-template-columns: 1fr 1.15fr 1fr;
  }

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

  .page-about .about-report {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    gap: 30px;
    padding: 28px 26px;
  }

  .page-about .about-report__stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-bottom: 0;
    padding-right: 26px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 46px;
    padding-top: 26px;
    padding-bottom: 72px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--top-h) + 24px);
    align-self: start;
    padding: 0;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    width: 100%;
    box-sizing: border-box;
    padding: 9px 10px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0 10px 10px 0;
    font-size: 13px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: rgba(43, 230, 200, .08);
    border-left-color: var(--mint);
  }

  .page-about .about-chapter {
    padding: 52px 0 12px;
  }

  .page-about .about-chapter:first-child {
    padding-top: 14px;
  }

  .page-about .about-history {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: 46px;
    margin-top: 32px;
  }

  .page-about .about-history__media img {
    aspect-ratio: 3 / 4;
    max-height: 560px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
    margin-top: 32px;
  }

  .page-about .about-split--flip .about-split__media {
    order: 2;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 40px;
  }

  .page-about .about-cases__media img,
  .page-about .about-split__media img {
    max-height: 380px;
  }
}
<<<END>>>