.page-about {
  --ab-line: rgba(63, 90, 76, .55);
  --ab-soft: rgba(63, 90, 76, .22);
  --ab-accent: var(--moss-lift);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 38px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(63, 90, 76, .20), transparent 64%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -46%;
  width: min(680px, 84%);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 62% 34%, rgba(169, 197, 182, .22), rgba(63, 90, 76, .10) 46%, transparent 70%);
  transform: rotate(-12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: min(420px, 62%);
  height: 6px;
  background: linear-gradient(90deg, var(--moss), var(--moss-lift) 55%, transparent);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: var(--fs-1);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--ink);
  transform: skewX(-1.4deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--faint);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  background: var(--panel);
  padding: 14px 16px 15px;
}

.page-about .about-stat__k {
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  letter-spacing: .12em;
  color: var(--faint);
}

.page-about .about-stat__v {
  font-size: var(--fs-2);
  font-weight: 700;
  line-height: 1;
  color: var(--ab-accent);
}

.page-about .about-stat__u {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: var(--fs-4);
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--faint);
}

/* ---------- 左右分栏 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-top: 10px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding: 14px 0 0;
  margin-bottom: 8px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: var(--fs-4);
  letter-spacing: .22em;
  color: var(--faint);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  text-decoration: none;
  font-size: var(--fs-4);
  line-height: 1.4;
  letter-spacing: .04em;
  color: var(--faint);
  padding: 8px 12px;
  border: 1px solid var(--line);
  transition: color .22s ease, border-color .22s ease, background-color .22s ease;
}

.page-about .about-rail__link .mono {
  font-size: .95em;
  color: var(--moss);
}

.page-about .about-rail__link:hover {
  color: var(--ink);
  border-color: var(--ab-line);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--moss-lift);
  border-color: var(--ab-line);
  background: var(--ab-soft);
}

.page-about .about-rail__link[aria-current="true"] .mono {
  color: var(--moss-lift);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: 30px 0 34px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .about-chapter__index {
  margin: 0 0 10px;
  font-size: var(--fs-4);
  letter-spacing: .2em;
  color: var(--moss-lift);
}

.page-about .about-chapter h2 {
  margin: 0 0 16px;
  max-width: 26ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-2);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
  transform: skewX(-1.2deg);
  transform-origin: left bottom;
}

.page-about .about-chapter h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-3);
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--ink);
}

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

.page-about .about-chapter a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 227, 196, .38);
}

.page-about .about-chapter a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-bars {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 12px;
}

.page-about .about-bar__name {
  font-size: var(--fs-4);
  letter-spacing: .04em;
  color: var(--faint);
}

.page-about .about-bar__track {
  display: block;
  height: 10px;
  background: var(--panel-2);
  border: 1px solid var(--line);
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--moss), var(--moss-lift));
}

.page-about .about-bar__fill--a { width: 39%; }
.page-about .about-bar__fill--b { width: 20%; }

.page-about .about-bar__num {
  text-align: right;
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--moss-lift);
}

/* ---------- 图框 ---------- */
.page-about .about-frame {
  margin: 0;
  padding: 8px;
  background: var(--panel-2);
  border: 1px solid var(--line);
}

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

.page-about .about-frame--wide {
  margin-top: 22px;
}

.page-about .about-frame__cap {
  margin: 9px 2px 0;
  font-size: var(--fs-4);
  line-height: 1.65;
  color: var(--faint);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .about-principle {
  position: relative;
  padding: 24px 18px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform .24s ease, border-color .24s ease;
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--moss), var(--moss-lift));
}

.page-about .about-principle:hover {
  transform: translateY(-2px);
  border-color: var(--ab-line);
}

.page-about .about-principle p {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.72;
  color: var(--faint);
}

.page-about .about-note {
  margin-top: 18px;
  padding: 13px 16px;
  font-size: var(--fs-3);
  line-height: 1.72;
  color: var(--faint);
  border-left: 3px solid var(--moss-lift);
  background: linear-gradient(90deg, var(--ab-soft), transparent 84%);
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 227, 196, .38);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ver {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--ab-line);
}

.page-about .about-ver:last-child {
  border-left-color: transparent;
}

.page-about .about-ver::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 17px;
  width: 11px;
  height: 11px;
  background: var(--bg);
  border: 2px solid var(--moss);
  transform: rotate(45deg);
  transition: background-color .22s ease, border-color .22s ease, box-shadow .22s ease;
}

.page-about .about-ver--current::before {
  background: var(--magenta);
  border-color: var(--magenta);
  box-shadow: 0 0 0 4px rgba(230, 62, 124, .18);
}

.page-about .about-ver summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0 14px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-ver__tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  letter-spacing: .14em;
  color: var(--moss-lift);
}

.page-about .about-ver--current .about-ver__tag {
  color: var(--magenta);
}

.page-about .about-ver__name {
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-ver summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  color: var(--faint);
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
}

.page-about .about-ver[open] summary::after {
  content: "收起";
  color: var(--moss-lift);
  border-bottom-color: var(--ab-line);
}

.page-about .about-ver__panel {
  padding: 0 0 20px;
}

.page-about .about-ver__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-3);
  line-height: 1.75;
  color: var(--faint);
}

/* ---------- 合作生态 ---------- */
.page-about .about-cluster {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-about .about-cluster__card {
  position: relative;
  padding: 22px 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-cluster__card::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 26px;
  height: 26px;
  background: linear-gradient(225deg, var(--ab-soft), transparent 72%);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-cluster__num {
  margin: 0 0 10px;
  font-size: var(--fs-2);
  font-weight: 700;
  line-height: 1;
  color: var(--moss-lift);
}

.page-about .about-cluster__num span {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: var(--fs-4);
  font-weight: 400;
  color: var(--faint);
}

.page-about .about-cluster__card p {
  margin: 0 0 14px;
  font-size: var(--fs-3);
  line-height: 1.7;
  color: var(--faint);
}

.page-about .about-cluster__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honor {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--ab-line);
  background: linear-gradient(120deg, var(--ab-soft), transparent 72%);
}

.page-about .about-honor__year {
  margin: 0;
  font-size: var(--fs-2);
  font-weight: 700;
  line-height: 1;
  color: var(--moss-lift);
}

.page-about .about-honor__text {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 湖南 ---------- */
.page-about .about-hunan {
  display: grid;
  gap: 22px;
}

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

/* ---------- 尾部行动 ---------- */
.page-about .about-cta {
  margin-top: 30px;
  padding: 32px 0 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(63, 90, 76, .30), rgba(11, 15, 20, 0) 66%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-2);
  line-height: 1.2;
  color: var(--ink);
  transform: skewX(-1.2deg);
  transform-origin: left bottom;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 54ch;
  font-size: var(--fs-3);
  line-height: 1.72;
  color: var(--faint);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

  .page-about .about-honor {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 22px;
  }
}

@media (min-width: 820px) {
  .page-about .about-principles,
  .page-about .about-cluster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 34px 0 46px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-hunan {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 34px;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 54px;
    align-items: start;
    padding-top: 0;
  }

  .page-about .about-rail {
    position: sticky;
    top: 116px;
    margin-bottom: 0;
    padding: 6px 0 6px 20px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

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

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 10px 10px 10px 14px;
  }

  .page-about .about-rail__link:hover {
    border-color: transparent;
    border-left-color: var(--ab-line);
  }

  .page-about .about-rail__link[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--moss-lift);
    background: linear-gradient(90deg, var(--ab-soft), transparent 78%);
  }
}

@media (min-width: 1080px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}