/* ============================================================
   品牌中心 · 页面专属样式（作用域：.page-about）
   ============================================================ */

.page-about {
  --ab-rail-w: 224px;
  --ab-glass: rgba(122, 255, 224, 0.07);
  --ab-rule: var(--c-line);
  display: block;
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--c-deep);
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(115% 88% at 6% 0%, rgba(31, 191, 159, 0.22) 0%, rgba(31, 191, 159, 0) 58%),
    linear-gradient(180deg, rgba(15, 20, 22, 0.48) 0%, rgba(15, 20, 22, 0.88) 58%, var(--c-base) 100%);
}

.page-about .about-hero__inner {
  padding-top: clamp(56px, 9vw, 112px);
  padding-bottom: clamp(40px, 5vw, 60px);
}

.page-about .about-hero .crumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--c-ink);
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .about-hero__title .fire {
  color: var(--c-fire);
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__lede {
  max-width: 48ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: #B7C9C6;
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
  max-width: 880px;
}

.page-about .about-hero__stats li {
  background: rgba(11, 35, 33, 0.84);
  padding: 14px clamp(12px, 1.6vw, 20px) 16px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  transition: background var(--t-fast);
}

.page-about .about-hero__stats li:hover {
  background: rgba(23, 64, 58, 0.9);
}

.page-about .about-hero__stats .v {
  font-family: var(--font-data);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.page-about .about-hero__stats .u {
  font-size: 0.52em;
  color: var(--c-dim);
  margin-left: 3px;
  font-weight: 400;
}

.page-about .about-hero__stats .k {
  font-size: var(--fs-12);
  color: var(--c-dim);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

/* ---------------- 主体两栏 ---------------- */

.page-about .about-body {
  padding-top: clamp(36px, 6vw, 64px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .about-body .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

/* ---------------- 左侧索引 ---------------- */

.page-about .rail {
  border: 1px solid var(--ab-rule);
  background: var(--c-deep);
  padding: 14px 0 10px;
}

.page-about .rail ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rail__title {
  font-family: var(--font-data);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-mint);
  margin: 0 0 10px;
  padding: 0 16px;
}

.page-about .rail__item a {
  display: block;
  padding: 9px 16px;
  font-size: var(--fs-14);
  color: var(--c-dim);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .rail__item a:hover,
.page-about .rail__item a:focus-visible,
.page-about .rail__item a.is-active {
  color: var(--c-ink);
  border-left-color: var(--c-mint);
  background: var(--ab-glass);
}

.page-about .rail__item a.is-active {
  color: var(--c-mint);
}

/* ---------------- 章节骨架 ---------------- */

.page-about .about-sec {
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(44px, 6vw, 76px);
  padding-top: clamp(44px, 6vw, 76px);
  border-top: 1px solid var(--ab-rule);
}

.page-about .section-title {
  max-width: 26ch;
}

.page-about .section-lede {
  max-width: 56ch;
}

/* ---------------- 01 使用者 ---------------- */

.page-about .about-who {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .about-who > li {
  background: var(--c-base);
  padding: clamp(18px, 2.4vw, 26px);
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  transition: background var(--t-fast);
}

.page-about .about-who > li:hover {
  background: var(--c-deep);
}

.page-about .about-who__no {
  font-family: var(--font-data);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-mint);
  letter-spacing: 0.06em;
}

.page-about .about-who__t {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 8px;
}

.page-about .about-who__d {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-dim);
}

/* ---------------- 02 覆盖 ---------------- */

.page-about .about-projects {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .about-proj {
  background: var(--c-deep);
  padding: 16px 14px 15px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  transition: background var(--t-fast), box-shadow var(--t-med);
}

.page-about .about-proj:hover {
  background: rgba(31, 191, 159, 0.1);
  box-shadow: inset 0 0 0 1px var(--c-mint);
}

.page-about .about-proj__key {
  font-family: var(--font-data);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-mint2);
}

.page-about .about-proj__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.02em;
  color: var(--c-ink);
  line-height: 1.1;
}

.page-about .about-proj__note {
  font-size: var(--fs-12);
  line-height: 1.55;
  color: var(--c-dim);
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-figures .v {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figures .u {
  font-size: 0.5em;
  color: var(--c-dim);
  margin-left: 3px;
  font-weight: 400;
}

.page-about .about-figures .k {
  display: block;
  margin-top: 9px;
  font-size: var(--fs-14);
  color: var(--c-ink);
}

.page-about .about-figures .d {
  display: block;
  margin-top: 5px;
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--c-dim);
}

/* ---------------- 03 团队 ---------------- */

.page-about .about-team {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-team__intro {
  margin: 0 0 clamp(20px, 2.8vw, 28px);
  font-size: var(--fs-16);
  line-height: 1.78;
  color: #C4D4D1;
  max-width: 46ch;
}

.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-bars__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 9px;
  color: var(--c-mint2);
}

.page-about .about-bars__label {
  font-size: var(--fs-14);
  color: var(--c-ink);
}

.page-about .about-bars__num {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bars__track {
  display: block;
  height: 6px;
  background: rgba(23, 64, 58, 0.75);
  border-radius: 999px;
  overflow: hidden;
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  width: var(--fill, 50%);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--c-mint2), var(--c-mint));
  transition: width var(--t-med);
}

.page-about .about-bars li:hover .about-bars__fill {
  background: linear-gradient(90deg, var(--c-mint), var(--c-mist));
}

/* 通用图片框 */

.page-about .about-fig {
  margin: 0;
  border: 1px solid var(--ab-rule);
  background: var(--c-deep);
  overflow: hidden;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  opacity: 0.9;
  transition: opacity var(--t-med);
}

.page-about .about-fig:hover img {
  opacity: 1;
}

.page-about .about-fig figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--ab-rule);
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--c-dim);
}

/* ---------------- 04 版本 ---------------- */

.page-about .about-ver {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-ver__text {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: var(--fs-16);
  line-height: 1.78;
  color: #C4D4D1;
  max-width: 40ch;
}

.page-about .about-timeline {
  --tl-pad: clamp(20px, 2.6vw, 28px);
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  border-left: 1px solid var(--ab-rule);
}

.page-about .about-tl {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 7px;
  left: calc(var(--tl-pad) * -1 - 3.5px);
  width: 7px;
  height: 7px;
  background: var(--c-base);
  border: 1px solid var(--c-mint2);
  transform: rotate(45deg);
  transition: background var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}

.page-about .about-tl:hover::before {
  background: var(--c-mint);
  border-color: var(--c-mint);
  box-shadow: 0 0 0 4px rgba(53, 242, 208, 0.14);
}

.page-about .about-tl.is-current::before {
  background: var(--c-fire);
  border-color: var(--c-fire);
  box-shadow: 0 0 0 4px rgba(255, 91, 46, 0.18);
}

.page-about .about-tl__ver {
  display: block;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  letter-spacing: 0.05em;
  color: var(--c-mint);
  margin-bottom: 7px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl.is-current .about-tl__ver {
  color: var(--c-fire);
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 7px;
}

.page-about .about-tl__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--c-dim);
  max-width: 44ch;
}

/* ---------------- 05 合作与资质 ---------------- */

.page-about .about-strip {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  gap: 1px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-mint2) transparent;
  border: 1px solid var(--ab-rule);
  background: var(--ab-rule);
}

.page-about .about-strip::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-strip::-webkit-scrollbar-thumb {
  background: var(--c-line);
  border-radius: 999px;
}

.page-about .about-partner {
  flex: 0 0 clamp(210px, 74%, 286px);
  scroll-snap-align: start;
  background: var(--c-deep);
  padding: clamp(18px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  transition: background var(--t-fast), box-shadow var(--t-med);
}

.page-about .about-partner:hover {
  background: rgba(31, 191, 159, 0.1);
  box-shadow: inset 0 0 0 1px var(--c-mint);
}

.page-about .about-partner__type {
  font-family: var(--font-data);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-mint2);
  margin-bottom: 12px;
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner__num small {
  font-size: 0.42em;
  font-weight: 400;
  color: var(--c-dim);
  margin-left: 5px;
}

.page-about .about-partner__text {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-dim);
}

.page-about .about-note {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-dim);
  max-width: 62ch;
}

/* ---------------- 06 运营归属 ---------------- */

.page-about .about-base {
  margin-top: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ab-rule);
  background:
    linear-gradient(135deg, rgba(31, 191, 159, 0.1) 0%, rgba(31, 191, 159, 0) 54%),
    var(--c-deep);
  padding: clamp(22px, 3.4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 38px);
}

.page-about .about-base__title {
  font-family: var(--font-display);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 14px;
}

.page-about .about-base__text {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: #C4D4D1;
  max-width: 42ch;
}

.page-about .about-base__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .about-base__facts li {
  background: rgba(15, 20, 22, 0.62);
  padding: 12px 16px;
  display: grid;
  gap: 5px;
}

.page-about .about-base__facts .k {
  font-family: var(--font-data);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--c-mint2);
}

.page-about .about-base__facts .v {
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--c-ink);
  word-break: break-word;
}

/* ---------------- 后续入口 ---------------- */

.page-about .about-next {
  margin-top: clamp(48px, 6vw, 80px);
  padding-top: clamp(32px, 4vw, 48px);
  border-top: 1px solid var(--ab-rule);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 clamp(18px, 2.4vw, 26px);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .about-next__card {
  background: var(--c-deep);
  padding: clamp(18px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 9px;
  text-decoration: none;
  transition: background var(--t-fast), box-shadow var(--t-med);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: rgba(31, 191, 159, 0.1);
  box-shadow: inset 0 0 0 1px var(--c-mint);
}

.page-about .about-next__k {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.01em;
  color: var(--c-ink);
  display: inline-flex;
  align-items: baseline;
}

.page-about .about-next__k::after {
  content: "→";
  display: inline-block;
  margin-left: 8px;
  font-size: 0.85em;
  color: var(--c-mint);
  transition: transform var(--t-fast);
}

.page-about .about-next__card:hover .about-next__k::after {
  transform: translateX(4px);
}

.page-about .about-next__d {
  font-size: var(--fs-14);
  line-height: 1.68;
  color: var(--c-dim);
}

/* ============================================================
   断点：640 / 760 / 900 / 940 / 1040
   ============================================================ */

@media (min-width: 640px) {
  .page-about .about-who {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-projects {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

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

  .page-about .about-base {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-ver {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .about-body .split {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .rail {
    position: sticky;
    top: calc(var(--head-h) + 20px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 窄屏：索引转为顶部横向滑动条 */

@media (max-width: 939px) {
  .page-about .rail {
    position: sticky;
    top: var(--head-h);
    z-index: 5;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }

  .page-about .rail::-webkit-scrollbar {
    display: none;
  }

  .page-about .rail__title {
    display: none;
  }

  .page-about .rail ul {
    display: flex;
    gap: 8px;
  }

  .page-about .rail__item a {
    white-space: nowrap;
    padding: 6px 12px;
    border: 1px solid var(--ab-rule);
    border-radius: var(--radius);
  }

  .page-about .rail__item a.is-active {
    border-color: var(--c-mint);
    background: rgba(53, 242, 208, 0.1);
  }
}

@media (max-width: 520px) {
  .page-about .about-who > li {
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-partner {
    flex-basis: 84%;
  }
}
<<<END>>>

.page-about {
  --fill: currentColor;
}