.page-about {
  --about-idx-w: 208px;
  --about-gap: clamp(28px, 5vw, 72px);
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(56px, 8vw, 104px);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-index__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
  scrollbar-color: rgba(200, 241, 53, .35) transparent;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--line-soft);
  background: rgba(14, 33, 25, .7);
  color: rgba(242, 245, 238, .74);
  font-size: 13px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: rgba(200, 241, 53, .5);
  background: rgba(20, 50, 42, .95);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  font-weight: 700;
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: clamp(96px, 14vh, 148px);
    padding-left: 14px;
  }

  .page-about .about-index::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: linear-gradient(180deg, var(--lime), var(--cyan) 55%, rgba(168, 69, 44, .6));
    opacity: .55;
  }

  .page-about .about-index__nav {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 6px;
  }

  .page-about .about-index__link {
    white-space: normal;
    border-color: transparent;
    background: transparent;
    padding: 7px 12px;
    font-size: 13.5px;
  }

  .page-about .about-index__link[aria-current="true"] {
    background: rgba(200, 241, 53, .14);
    border-color: rgba(200, 241, 53, .55);
    color: var(--lime);
    font-weight: 600;
  }
}

/* ---------- 通用区块节奏 ---------- */
.page-about .about-section + .about-section {
  margin-top: var(--about-gap);
}

.page-about .about-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 0;
}

.page-about .about-section h3 {
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

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

.page-about .about-section .lead {
  max-width: 60ch;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 110% at 92% 0%, rgba(200, 241, 53, .12), transparent 55%),
    radial-gradient(90% 120% at 0% 100%, rgba(168, 69, 44, .22), transparent 62%),
    linear-gradient(170deg, var(--board), var(--ink) 78%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -120px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  border: 1px solid rgba(47, 209, 197, .22);
  pointer-events: none;
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--paper);
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-hero .lead {
  margin-top: 18px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(26px, 4vw, 42px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: start;
  }
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  align-content: start;
}

.page-about .about-fig {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-left: 3px solid var(--lime);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(242, 245, 238, .035);
}

.page-about .about-fig:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .about-fig:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .about-fig:nth-child(4) {
  border-left-color: var(--clay);
}

.page-about .about-fig__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--paper);
  letter-spacing: -.02em;
}

.page-about .about-fig:nth-child(3) .about-fig__num {
  color: var(--lime);
}

.page-about .about-fig__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(242, 245, 238, .68);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
}

.page-about .about-hero__media img {
  border-radius: var(--radius-lg);
}

/* ---------- 四个小组 ---------- */
.page-about .about-groups-section .section-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .group-item {
  --gc: var(--lime);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(20, 50, 42, .92), rgba(11, 27, 21, .92));
  overflow: hidden;
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .group-item:nth-child(2) {
  --gc: var(--cyan);
}

.page-about .group-item:nth-child(3) {
  --gc: var(--orange);
}

.page-about .group-item:nth-child(4) {
  --gc: var(--clay);
}

.page-about .group-item:hover {
  border-color: rgba(242, 245, 238, .22);
}

.page-about .group-head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .about-groups .group-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  color: var(--paper);
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.page-about .about-groups .group-trigger:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-groups .group-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--pill);
  border: 1px solid var(--gc);
  color: var(--gc);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-groups .group-name {
  font-size: clamp(16px, 1.9vw, 18px);
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-groups .accordion-icon {
  position: relative;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.page-about .about-groups .accordion-icon::before,
.page-about .about-groups .accordion-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gc);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.page-about .about-groups .accordion-icon::before {
  width: 14px;
  height: 2px;
}

.page-about .about-groups .accordion-icon::after {
  width: 2px;
  height: 14px;
}

.page-about .group-trigger[aria-expanded="true"] .accordion-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .about-groups .accordion-panel {
  padding: 0 20px 20px;
  border-top: 1px solid var(--line-soft);
  margin-top: 2px;
  padding-top: 16px;
}

.page-about .about-groups .accordion-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 238, .78);
}

.page-about .about-groups .accordion-panel a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-groups .accordion-panel ul {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-groups .accordion-panel li {
  position: relative;
  padding-left: 16px;
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 245, 238, .7);
}

.page-about .about-groups .accordion-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gc);
}

/* ---------- 版本年轮 ---------- */
.page-about .about-arc {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(85% 130% at 100% 0%, rgba(47, 209, 197, .16), transparent 62%),
    linear-gradient(135deg, var(--panel), var(--board) 68%, var(--ink));
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-arc {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    align-items: center;
  }
}

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

.page-about .about-arc__ticks {
  height: 22px;
  margin-top: 20px;
  border-top: 1px solid var(--line-soft);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 24px);
}

.page-about .about-arc__media {
  margin: 0;
  border-radius: var(--radius-lg);
  max-width: 320px;
}

.page-about .about-arc__media img {
  border-radius: var(--radius-lg);
}

.page-about .about-versions__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .version-item {
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: rgba(14, 33, 25, .68);
  overflow: hidden;
  transition: border-color .22s var(--ease);
}

.page-about .version-item:hover {
  border-color: rgba(200, 241, 53, .3);
}

.page-about .about-versions__list .version-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  border: 0;
  background: transparent;
  color: var(--paper);
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.page-about .about-versions__list .version-trigger:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .version-year {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .version-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--pill);
  border: 1px solid rgba(255, 106, 31, .55);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  white-space: nowrap;
}

.page-about .version-title {
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 600;
  color: var(--paper);
  min-width: 0;
}

.page-about .about-versions__list .accordion-icon {
  position: relative;
  width: 16px;
  height: 16px;
}

.page-about .about-versions__list .accordion-icon::before,
.page-about .about-versions__list .accordion-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--moss);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.page-about .about-versions__list .accordion-icon::before {
  width: 13px;
  height: 2px;
}

.page-about .about-versions__list .accordion-icon::after {
  width: 2px;
  height: 13px;
}

.page-about .version-trigger[aria-expanded="true"] .accordion-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .version-trigger[aria-expanded="true"] .accordion-icon::before {
  background: var(--lime);
}

.page-about .about-versions__list .accordion-panel {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .about-versions__list .accordion-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 245, 238, .76);
  max-width: 62ch;
}

/* ---------- 数据校验 ---------- */
.page-about .about-verify .section-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-flow__node {
  position: relative;
  padding: 20px 18px 20px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: rgba(20, 50, 42, .5);
}

.page-about .about-flow__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 3px;
  height: 26px;
  border-radius: 0 3px 3px 0;
  background: var(--cyan);
}

.page-about .about-flow__node:nth-child(2)::before {
  background: var(--lime);
}

.page-about .about-flow__node:nth-child(3)::before {
  background: var(--orange);
}

.page-about .about-flow__node:nth-child(4)::before {
  background: var(--clay);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--moss);
  margin-bottom: 8px;
}

.page-about .about-flow__node h3 {
  font-size: 16.5px;
  margin-bottom: 8px;
}

.page-about .about-flow__node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 245, 238, .74);
}

.page-about .about-verify__media {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

/* ---------- 订阅支持 ---------- */
.page-about .about-support .section-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-support__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 880px) {
  .page-about .about-support__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-step:nth-child(2) {
    transform: translateY(18px);
  }
}

.page-about .about-step {
  padding: 22px 20px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(20, 50, 42, .85), rgba(11, 27, 21, .85));
}

.page-about .about-step__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
  margin-bottom: 12px;
}

.page-about .about-step h3 {
  margin-bottom: 10px;
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 238, .76);
}

.page-about .about-support__contact {
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 106, 31, .3);
  background: linear-gradient(120deg, rgba(168, 69, 44, .18), rgba(7, 19, 15, .5) 70%);
}

.page-about .about-support__contact p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 245, 238, .82);
}

.page-about .about-mono {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--lime);
  letter-spacing: .01em;
  word-break: break-all;
}

.page-about .about-support__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px !important;
}

/* ---------- 年度认证 ---------- */
.page-about .about-cert__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(168, 69, 44, .24), transparent 60%),
    linear-gradient(180deg, var(--board), var(--char));
}

@media (min-width: 760px) {
  .page-about .about-cert__card {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-cert__seal {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  border: 2px solid rgba(200, 241, 53, .55);
  box-shadow: inset 0 0 0 6px rgba(200, 241, 53, .08);
  flex: 0 0 auto;
}

.page-about .about-cert__seal-year {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-about .about-cert__seal-text {
  font-size: 12px;
  letter-spacing: .22em;
  color: rgba(242, 245, 238, .7);
}

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

.page-about .about-cert__copy h2 {
  margin-top: 8px;
}

.page-about .about-cert__copy p {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 245, 238, .8);
}

.page-about .about-cert__note {
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px !important;
  color: rgba(242, 245, 238, .62) !important;
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .group-item,
  .page-about .version-item,
  .page-about .accordion-icon::before,
  .page-about .accordion-icon::after {
    transition: none;
  }

  .page-about .about-step:nth-child(2) {
    transform: none;
  }
}