.page-about {
  --ab-rail: 196px;
  --ab-line: var(--c-line);
  background-image:
    radial-gradient(680px 420px at 86% -10%, rgba(47, 125, 246, 0.22), transparent 68%),
    radial-gradient(520px 340px at 2% 3%, rgba(184, 255, 60, 0.09), transparent 72%);
  background-repeat: no-repeat;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(30px, 5.5vw, 72px) clamp(24px, 4vw, 48px);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  margin: 14px 0 16px;
  max-width: 17em;
}

.page-about .ab-hero__lede {
  max-width: 42em;
  color: rgba(244, 234, 218, 0.82);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .ab-hero__anchor {
  display: grid;
  gap: 8px;
  align-content: end;
  padding: 14px 0 4px 18px;
  border-left: 2px solid var(--c-line);
}

.page-about .ab-hero__anchor .score-num {
  display: block;
  font-family: var(--font-score);
  font-weight: 900;
  font-size: clamp(64px, 15vw, 128px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--c-orange);
}

.page-about .ab-hero__anchor-cap {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-paper);
}

.page-about .ab-hero__anchor-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
  max-width: 22em;
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(216px, 0.7fr);
    align-items: end;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  padding-bottom: clamp(44px, 7vw, 100px);
}

@media (min-width: 1040px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 58px);
  }
}

/* ---------- 章节索引 ---------- */
.page-about .ab-rail__cap {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-muted);
  margin: 0 0 10px;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--c-muted);
  padding: 6px 11px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  color: var(--c-paper);
  border-color: var(--c-blue);
  background: rgba(47, 125, 246, 0.14);
}

.page-about .ab-rail__num {
  font-family: var(--font-score);
  font-weight: 900;
  font-size: 13px;
  color: var(--c-orange);
}

@media (min-width: 1040px) {
  .page-about .ab-rail {
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .ab-rail__list a {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--c-line);
    border-radius: 0;
    padding: 9px 10px 9px 14px;
    background: transparent;
  }

  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    border-left-color: var(--c-blue);
    background: linear-gradient(90deg, rgba(47, 125, 246, 0.18), transparent 78%);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .ab-chapter {
  padding-block: clamp(26px, 4.4vw, 52px);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: 104px;
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: clamp(6px, 1.6vw, 16px);
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(10px, 1.6vw, 18px);
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .ab-chapter__num {
  flex: none;
  font-family: var(--font-score);
  font-weight: 900;
  font-size: clamp(27px, 4.6vw, 46px);
  line-height: 0.84;
  letter-spacing: -0.02em;
  color: var(--c-line);
}

.page-about .ab-chapter__kicker {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-muted);
}

.page-about .ab-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.3vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--c-paper);
}

/* ---------- 版面通用元素 ---------- */
.page-about .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 234, 218, 0.82);
}

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

.page-about .media__frame {
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  background: var(--c-table);
}

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

.page-about .media__cap {
  margin-top: 10px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

/* ---------- 01 品牌叙事 ---------- */
.page-about .ab-story {
  display: grid;
  gap: clamp(16px, 2.6vw, 30px);
}

.page-about .ab-story__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

@media (min-width: 880px) {
  .page-about .ab-story {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

/* ---------- 02 版本时间线 ---------- */
.page-about .ab-versions__media {
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
}

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  gap: 7px;
}

.page-about .ab-tl__ver {
  font-family: var(--font-score);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-muted);
}

.page-about .ab-tl__item--v2 .ab-tl__ver { color: var(--c-blue-soft); }
.page-about .ab-tl__item--v3 .ab-tl__ver { color: var(--c-blue); }
.page-about .ab-tl__item--v4 .ab-tl__ver { color: var(--c-green); }
.page-about .ab-tl__item--v5 .ab-tl__ver { color: var(--c-orange); }

.page-about .ab-tl__item--patch .ab-tl__ver {
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--c-red);
}

.page-about .ab-tl__body {
  background: var(--c-table);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-soft);
  padding: clamp(13px, 1.8vw, 20px) clamp(14px, 2vw, 22px);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__body,
.page-about .ab-tl__item:focus-within .ab-tl__body {
  transform: translateX(4px);
  border-color: var(--c-blue);
  box-shadow: var(--shadow-card);
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: clamp(15px, 1.6vw, 18px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--c-paper);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .ab-tl__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

@media (min-width: 720px) {
  .page-about .ab-tl::before {
    content: "";
    position: absolute;
    left: 110px;
    top: 18px;
    bottom: 18px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--c-line) 10%, var(--c-line) 90%, transparent);
  }

  .page-about .ab-tl__item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .ab-tl__item::before {
    content: "";
    position: absolute;
    left: 103px;
    top: 18px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--c-ink);
    border: 2px solid var(--c-line);
    transition: background 0.22s var(--ease), border-color 0.22s var(--ease), transform 0.22s var(--ease);
  }

  .page-about .ab-tl__item:hover::before,
  .page-about .ab-tl__item:focus-within::before {
    background: var(--c-green);
    border-color: var(--c-green);
    transform: scale(1.16);
  }
}

/* ---------- 03 内容班表 ---------- */
.page-about .ab-ops {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-ops__list {
  display: grid;
  gap: 12px;
}

.page-about .ab-ops__item {
  padding: clamp(14px, 1.9vw, 20px) clamp(15px, 2vw, 22px);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-blue);
  border-radius: var(--radius-soft);
  background: linear-gradient(158deg, rgba(47, 125, 246, 0.12), transparent 62%), var(--c-table);
}

.page-about .ab-ops__item--2 {
  border-left-color: var(--c-orange);
  background: linear-gradient(158deg, rgba(255, 122, 47, 0.12), transparent 62%), var(--c-table);
}

.page-about .ab-ops__item--3 {
  border-left-color: var(--c-green);
  background: linear-gradient(158deg, rgba(184, 255, 60, 0.1), transparent 62%), var(--c-table);
}

.page-about .ab-ops__label {
  display: block;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-muted);
  margin-bottom: 7px;
}

.page-about .ab-ops__title {
  margin: 0 0 7px;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--c-paper);
}

.page-about .ab-ops__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 234, 218, 0.78);
}

.page-about .ab-ops__foot {
  margin: 4px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-muted);
}

@media (min-width: 940px) {
  .page-about .ab-ops {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
    align-items: start;
  }
}

/* ---------- 04 团队与分工 ---------- */
.page-about .ab-team__lead {
  max-width: 62ch;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 234, 218, 0.82);
}

.page-about .ab-team__list {
  display: grid;
  gap: 12px;
}

.page-about .ab-team__group {
  background: var(--c-table);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-soft);
  overflow: hidden;
  transition: border-color 0.22s var(--ease);
}

.page-about .ab-team__group[open] {
  border-color: var(--c-blue);
}

.page-about .ab-team__group summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-team__role {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .ab-team__count {
  font-family: var(--font-score);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  color: var(--c-blue);
}

.page-about .ab-team__count em {
  font-family: var(--font-label);
  font-style: normal;
  font-size: 11px;
  font-weight: 500;
  color: var(--c-muted);
  margin-left: 3px;
}

.page-about .ab-team__group summary::after {
  content: "+";
  font-family: var(--font-score);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-muted);
  transition: color 0.2s var(--ease);
}

.page-about .ab-team__group[open] summary::after {
  content: "–";
  color: var(--c-green);
}

.page-about .ab-team__desc {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
}

@media (min-width: 820px) {
  .page-about .ab-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 05 覆盖与场景 ---------- */
.page-about .ab-reach__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .ab-reach__stats {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  border-top: 1px solid var(--c-line);
  padding-top: 18px;
}

.page-about .ab-reach__n {
  display: block;
  font-family: var(--font-score);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--c-green);
}

.page-about .ab-reach__c {
  display: block;
  margin-top: 5px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-about .ab-reach__fig {
  margin: 0;
}

.page-about .ab-reach__svg {
  display: block;
  width: 100%;
  max-width: 440px;
  height: auto;
}

.page-about .ab-reach__ring {
  fill: none;
  stroke: var(--c-line);
  stroke-width: 1;
}

.page-about .ab-reach__ring--hot {
  stroke: var(--c-blue);
  stroke-dasharray: 5 7;
}

.page-about .ab-reach__ray {
  stroke: var(--c-blue-soft);
  stroke-width: 1;
  opacity: 0.5;
}

.page-about .ab-reach__core {
  fill: var(--c-orange);
}

.page-about .ab-reach__label {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.1em;
  fill: var(--c-muted);
}

.page-about .ab-reach__cap {
  margin-top: 10px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

@media (min-width: 880px) {
  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .ab-reach__fig {
    justify-self: end;
  }
}

/* ---------- 06 行业认可 ---------- */
.page-about .ab-honor__track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 16px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--c-line) transparent;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .ab-honor__track::-webkit-scrollbar-thumb {
  background: var(--c-line);
  border-radius: var(--radius-pill);
}

.page-about .ab-honor__card {
  flex: 0 0 min(320px, 82vw);
  scroll-snap-align: start;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--c-table);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-blue);
  border-radius: var(--radius-card);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-honor__card:nth-child(2) {
  border-top-color: var(--c-orange);
}

.page-about .ab-honor__card:nth-child(3) {
  border-top-color: var(--c-green);
}

.page-about .ab-honor__card:hover {
  transform: translateY(-4px);
  border-color: var(--c-blue);
}

.page-about .ab-honor__kicker {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-orange);
}

.page-about .ab-honor__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.32;
  color: var(--c-paper);
}

.page-about .ab-honor__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 07 合作生态 ---------- */
.page-about .ab-partners__lead {
  max-width: 64ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 234, 218, 0.82);
}

.page-about .ab-partners__grid {
  display: grid;
  gap: 14px;
  margin: clamp(16px, 2.4vw, 26px) 0;
}

.page-about .ab-partners__card {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--c-table);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-blue);
  border-radius: var(--radius-soft);
}

.page-about .ab-partners__card--media {
  border-top-color: var(--c-orange);
}

.page-about .ab-partners__card--local {
  border-top-color: var(--c-green);
}

.page-about .ab-partners__num {
  display: block;
  font-family: var(--font-score);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 58px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--c-paper);
  margin-bottom: 10px;
}

.page-about .ab-partners__label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-blue-soft);
}

.page-about .ab-partners__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 234, 218, 0.76);
}

.page-about .ab-partners__foot {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .ab-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-blue-soft);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--c-line);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--c-green);
  border-bottom-color: var(--c-green);
}

@media (min-width: 780px) {
  .page-about .ab-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__item:hover .ab-tl__body,
  .page-about .ab-tl__item:focus-within .ab-tl__body,
  .page-about .ab-honor__card:hover {
    transform: none;
  }
}