.page-about {
  --about-rail-w: 232px;
  --about-ink-soft: rgba(251, 248, 240, 0.76);
  --about-slate-soft: rgba(27, 42, 51, 0.64);
  background: var(--paper);
  color: var(--slate);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper-2);
  padding: 22px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -100px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle at 35% 35%, rgba(45, 212, 255, 0.22), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--orange), var(--blue));
}

.page-about .breadcrumbs {
  position: relative;
  z-index: 1;
  font-size: 13px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--orange);
}

.page-about .breadcrumbs a {
  color: rgba(251, 248, 240, 0.6);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--blue);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper-2);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 34px;
}

.page-about .about-hero__title .eyebrow {
  color: var(--orange-soft);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(34px, 8.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--paper-2);
}

.page-about .about-hero__lede {
  padding-left: 18px;
  border-left: 2px solid var(--orange);
}

.page-about .about-hero__lede .lede {
  margin: 0;
  color: var(--about-ink-soft);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-hero__meta {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .about-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin: 44px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.page-about .about-stats__num {
  display: block;
  font-size: clamp(28px, 7vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  color: rgba(251, 248, 240, 0.58);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-main {
  padding-bottom: 72px;
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 52px;
}

/* ---------- 左侧窄栏 ---------- */
.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-rail__versions {
  margin-top: 30px;
}

.page-about .about-rail__list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
  list-style: none;
}

.page-about .about-rail__list li {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-rail__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  font-size: 15px;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--orange);
  padding-left: 5px;
}

.page-about .about-rail__list .mono {
  font-size: 12px;
  color: var(--link);
}

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

.page-about .about-rail__versions li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--slate);
}

.page-about .about-rail__versions .mono {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  padding: 4px 7px;
  background: var(--ink);
  color: var(--orange-soft);
  border-radius: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-bottom: 56px;
  scroll-margin-top: 88px;
}

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

.page-about .about-sec__index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--link);
}

.page-about .about-sec__index::before {
  content: "";
  flex: 0 0 auto;
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-sec h2 {
  max-width: 24ch;
  margin: 0 0 16px;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.022em;
  color: var(--ink);
}

.page-about .about-sec__intro {
  max-width: 60ch;
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-body .prose p {
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--slate);
}

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

/* ---------- 双栏图文 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 24px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--line-light);
  background: var(--ink-2);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-slate-soft);
}

.page-about .about-figure--pano {
  margin-top: 26px;
}

/* ---------- 版本卡片 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 13px;
  margin-top: 22px;
}

.page-about .about-version {
  background: var(--paper-2);
  border: 1px solid var(--line-light);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .about-version .expand__btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 17px 18px;
  background: none;
  border: 0;
  border-left: 3px solid var(--blue);
  font-family: var(--f-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.page-about .about-version .expand__btn:hover {
  background: rgba(45, 212, 255, 0.06);
}

.page-about .about-version .expand__btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.page-about .about-version__tag {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 5px 7px;
  background: var(--ink);
  color: var(--orange);
  border-radius: 3px;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-version__head {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-version .expand__panel {
  padding: 0 18px 18px 35px;
}

.page-about .about-version .expand__panel ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-version .expand__panel li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-version .expand__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-role {
  padding: 18px 17px 20px;
  background: var(--paper-2);
  border-top: 3px solid var(--orange);
  border-radius: 0 0 var(--r-md) var(--r-md);
  box-shadow: var(--shadow-1);
}

.page-about .about-role:nth-child(2) {
  border-top-color: var(--blue);
}

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

.page-about .about-role__tag {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-slate-soft);
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  margin-top: 22px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-reach__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-reach__num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-reach__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-reach__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--slate);
}

/* ---------- 深色品质区块 ---------- */
.page-about .about-sec--ink {
  position: relative;
  overflow: hidden;
  padding: 30px 22px;
  background: var(--ink);
  border-radius: var(--r-lg);
  color: var(--paper-2);
}

.page-about .about-sec--ink::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 230px;
  height: 230px;
  background: radial-gradient(circle, rgba(255, 107, 44, 0.3), transparent 66%);
  pointer-events: none;
}

.page-about .about-sec--ink .about-sec__index {
  position: relative;
  color: var(--orange-soft);
}

.page-about .about-sec--ink h2 {
  position: relative;
  color: var(--paper-2);
}

.page-about .about-quality {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 18px;
}

.page-about .about-quality__col p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

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

.page-about .about-quality__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-quality__list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-quality__list .mono {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .about-quality__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-sec--final .about-sec__intro {
  max-width: 66ch;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cta__links a {
  display: inline-block;
  font-size: 14px;
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 92, 116, 0.32);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 26px 0 62px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .about-reach__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .about-reach__num {
    font-size: 28px;
  }

  .page-about .about-sec--ink {
    padding: 40px 34px;
  }

  .page-about .about-quality__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .about-version .expand__btn {
    font-size: 17px;
    padding: 19px 22px;
  }

  .page-about .about-version .expand__panel {
    padding: 0 22px 20px 42px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 48px;
    margin-top: 46px;
  }

  .page-about .about-hero__lede {
    padding-left: 22px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 68px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 34px;
    align-self: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 316px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: 316px minmax(0, 1fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 1;
  }

  .page-about .about-split--reverse .about-figure {
    order: 0;
  }

  .page-about .about-quality {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-sec {
    padding-bottom: 68px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-cta__links a,
  .page-about .breadcrumbs a {
    transition: none;
  }
}