.page-about {
  position: relative;
  background-color: var(--oy-deep);
  color: var(--oy-ink);
  font-family: var(--oy-font-sans);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(20, 98, 76, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 98, 76, 0.42) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
  opacity: 0.5;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
  border-bottom: var(--oy-line);
  border-top: 1px solid var(--oy-grid);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--oy-lime) 0%,
    var(--oy-lime) 24%,
    var(--oy-grid) 24%,
    var(--oy-grid) 100%
  );
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 34px;
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.2vw, 52px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--oy-ink);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--oy-ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__ver {
  position: relative;
  padding: 24px 22px 28px;
  background:
    linear-gradient(155deg, rgba(198, 255, 61, 0.14), rgba(15, 74, 58, 0) 46%),
    linear-gradient(160deg, var(--oy-panel), var(--oy-base));
  clip-path: polygon(
    0 0,
    calc(100% - 22px) 0,
    100% 22px,
    100% 100%,
    22px 100%,
    0 calc(100% - 22px)
  );
  box-shadow: inset 0 0 0 1px var(--oy-grid);
}

.page-about .about-hero__vlabel {
  margin: 0;
  color: var(--oy-ink-2);
}

.page-about .about-hero__vnum {
  display: block;
  margin: 8px 0 0;
  font-family: var(--oy-font-mono);
  font-weight: 700;
  font-size: clamp(74px, 19vw, 140px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--oy-lime);
  text-shadow: 0 0 42px rgba(198, 255, 61, 0.26);
}

.page-about .about-hero__vnote {
  margin: 16px 0 0;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--oy-ink-2);
}

/* ---------- 章节通用 ---------- */
.page-about .about-origin,
.page-about .about-timeline,
.page-about .about-data,
.page-about .about-team,
.page-about .about-principles-section,
.page-about .about-community,
.page-about .about-trust,
.page-about .about-next {
  padding: 54px 0;
  border-bottom: var(--oy-line);
}

.page-about .oy-section__head {
  margin: 0 0 30px;
  max-width: 46ch;
}

.page-about .oy-section__head h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--oy-ink);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__cols {
  display: grid;
  gap: 30px;
}

.page-about .about-origin__text p {
  margin: 0 0 1.2em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--oy-ink-2);
}

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

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

.page-about .about-origin__point {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: var(--oy-line);
}

.page-about .about-origin__point:last-child {
  border-bottom: var(--oy-line);
}

.page-about .about-origin__pnum {
  padding-top: 3px;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--oy-lime);
}

.page-about .about-origin__ptitle {
  display: block;
  margin-bottom: 5px;
  font-size: 17px;
  font-weight: 800;
  color: var(--oy-ink);
}

.page-about .about-origin__point p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

/* ---------- 版本轴 ---------- */
.page-about .about-timeline__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.page-about .about-timeline__indexlink {
  padding: 7px 13px;
  border: 1px solid var(--oy-grid);
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--oy-ink-2);
  text-decoration: none;
  transition: color 0.2s var(--oy-ease), border-color 0.2s var(--oy-ease);
}

.page-about .about-timeline__indexlink:hover,
.page-about .about-timeline__indexlink:focus-visible {
  color: var(--oy-lime);
  border-color: var(--oy-lime-dim);
}

.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--oy-lime) 0%,
    var(--oy-grid) 26%,
    var(--oy-grid) 100%
  );
}

.page-about .about-axis__item {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .about-axis__dot {
  position: absolute;
  left: -29px;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--oy-grid);
  border-radius: 50%;
  background: var(--oy-deep);
  transition: background 0.24s var(--oy-ease), border-color 0.24s var(--oy-ease),
    transform 0.24s var(--oy-ease);
}

.page-about .about-axis__item:target .about-axis__dot {
  background: var(--oy-lime);
  border-color: var(--oy-lime);
  transform: scale(1.2);
}

.page-about .about-axis__item:target .about-axis__ver {
  color: var(--oy-lime);
}

.page-about .about-axis__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-about .about-axis__ver {
  font-family: var(--oy-font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--oy-ink);
  transition: color 0.24s var(--oy-ease);
}

.page-about .about-axis__name {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--oy-ink);
}

.page-about .about-axis__sum {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

/* ---------- 折叠面板 ---------- */
.page-about .about-fold {
  margin-top: 12px;
  border-top: 1px solid rgba(20, 98, 76, 0.8);
}

.page-about .about-fold--wide {
  margin-top: 28px;
  padding: 0 18px;
  background: var(--oy-base);
  border: var(--oy-line);
  border-top: 1px solid var(--oy-grid);
}

.page-about .about-fold > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--oy-ink-2);
  transition: color 0.2s var(--oy-ease);
}

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

.page-about .about-fold > summary::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 2px;
  background: var(--oy-grid);
  transition: background 0.2s var(--oy-ease);
}

.page-about .about-fold > summary::after {
  content: "+";
  margin-left: auto;
  font-size: 15px;
  line-height: 1;
  color: var(--oy-lime);
}

.page-about .about-fold[open] > summary::after {
  content: "—";
}

.page-about .about-fold[open] > summary::before {
  background: var(--oy-lime);
}

.page-about .about-fold > summary:hover,
.page-about .about-fold > summary:focus-visible {
  color: var(--oy-ink);
}

.page-about .about-fold__body {
  padding: 2px 0 16px;
}

.page-about .about-fold__body p {
  margin: 0 0 0.9em;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--oy-ink-2);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--oy-line);
  clip-path: polygon(
    0 0,
    calc(100% - 18px) 0,
    100% 18px,
    100% 100%,
    18px 100%,
    0 calc(100% - 18px)
  );
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--oy-ink-2);
}

/* ---------- 数据体系 ---------- */
.page-about .about-data__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 32px;
  background: var(--oy-grid);
  border: var(--oy-line);
}

.page-about .about-stat {
  padding: 22px 18px 24px;
  background: var(--oy-base);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--oy-font-mono);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--oy-lime);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--oy-ink-2);
}

.page-about .about-data__lead {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--oy-ink-2);
}

.page-about .about-layers {
  display: grid;
  gap: 1px;
  background: var(--oy-grid);
  border: var(--oy-line);
}

.page-about .about-layer {
  padding: 18px;
  background: var(--oy-deep);
}

.page-about .about-layer__name {
  display: block;
  margin-bottom: 8px;
  font-family: var(--oy-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--oy-lime);
}

.page-about .about-layer__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

/* ---------- 团队 ---------- */
.page-about .about-team__lead {
  margin: 0 0 30px;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--oy-ink-2);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__blocks {
  display: grid;
  gap: 2px;
}

.page-about .about-team__block {
  position: relative;
  padding: 18px 20px 20px;
  background: linear-gradient(120deg, var(--oy-panel), rgba(15, 74, 58, 0.4));
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 18px),
    calc(100% - 18px) 100%,
    0 100%
  );
  transition: background 0.25s var(--oy-ease), transform 0.25s var(--oy-ease);
}

.page-about .about-team__btitle {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--oy-ink);
}

.page-about .about-team__btext {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

.page-about .about-team__hint {
  margin: 8px 0 0;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--oy-lime-dim);
}

.page-about .about-flow {
  display: grid;
  gap: 1px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  background: var(--oy-grid);
  border: var(--oy-line);
}

.page-about .about-flow__step {
  padding: 20px 18px 22px;
  background: var(--oy-base);
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--oy-ink-2);
}

.page-about .about-flow__title {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 800;
  color: var(--oy-ink);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--oy-ink-2);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 2px;
}

.page-about .about-principle {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--oy-panel);
  border-top: 2px solid var(--oy-grid);
  transition: border-color 0.25s var(--oy-ease), background 0.25s var(--oy-ease);
}

.page-about .about-principle:hover {
  border-top-color: var(--oy-lime);
  background: linear-gradient(150deg, rgba(198, 255, 61, 0.09), var(--oy-panel) 62%);
}

.page-about .about-principle__mark {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--oy-ink-2);
  opacity: 0.65;
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  padding-right: 28px;
  font-size: 17px;
  font-weight: 800;
  color: var(--oy-ink);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

/* ---------- 内容互荐 ---------- */
.page-about .about-community__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-community__badge {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 22px 26px 24px;
  border-left: 3px solid var(--oy-lime);
  background: linear-gradient(120deg, rgba(15, 74, 58, 0.9), rgba(7, 31, 25, 0.2));
}

.page-about .about-community__num {
  font-family: var(--oy-font-mono);
  font-weight: 700;
  font-size: clamp(46px, 12vw, 76px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--oy-lime);
}

.page-about .about-community__unit {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--oy-ink-2);
}

.page-about .about-community__text h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1.24;
  color: var(--oy-ink);
}

.page-about .about-community__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--oy-ink-2);
}

.page-about .about-community__text .oy-btn {
  margin-top: 8px;
}

/* ---------- 安装之前 ---------- */
.page-about .about-trust__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-trust__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: var(--oy-line);
}

.page-about .about-trust__item:last-child {
  border-bottom: var(--oy-line);
}

.page-about .about-trust__key {
  font-family: var(--oy-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.9;
  color: var(--oy-lime);
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--oy-ink-2);
}

.page-about .about-trust__more {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--oy-ink-2);
}

.page-about .about-trust__more a {
  color: var(--oy-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--oy-lime-dim);
}

.page-about .about-trust__more a:hover,
.page-about .about-trust__more a:focus-visible {
  color: var(--oy-ink);
  border-bottom-color: var(--oy-ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-bottom: 0;
}

.page-about .about-next h2 {
  margin: 10px 0 26px;
  font-size: clamp(23px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1.24;
  color: var(--oy-ink);
}

.page-about .about-next__links {
  display: grid;
  gap: 2px;
}

.page-about .about-next__link {
  display: block;
  padding: 20px 22px 22px;
  background: var(--oy-base);
  border-left: 2px solid var(--oy-grid);
  text-decoration: none;
  transition: border-color 0.24s var(--oy-ease), background 0.24s var(--oy-ease),
    transform 0.24s var(--oy-ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-left-color: var(--oy-lime);
  background: linear-gradient(100deg, rgba(198, 255, 61, 0.1), var(--oy-base) 58%);
  transform: translateX(4px);
}

.page-about .about-next__lname {
  display: block;
  margin-bottom: 7px;
  font-size: 17px;
  font-weight: 800;
  color: var(--oy-ink);
}

.page-about .about-next__ldesc {
  display: block;
  font-size: 15px;
  line-height: 1.78;
  color: var(--oy-ink-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-data__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-principles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-principle:nth-child(1) {
    grid-column: span 3;
  }
  .page-about .about-principle:nth-child(2) {
    grid-column: span 3;
  }
  .page-about .about-principle:nth-child(3) {
    grid-column: span 2;
  }
  .page-about .about-principle:nth-child(4) {
    grid-column: span 2;
  }
  .page-about .about-principle:nth-child(5) {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__cols {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 54px;
  }
  .page-about .about-community__inner {
    grid-template-columns: minmax(200px, 0.55fr) minmax(0, 1.45fr);
    gap: 48px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 46px 0 64px;
  }
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.85fr);
    gap: 52px;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 46px;
    align-items: start;
  }
  .page-about .about-figure--team {
    margin-top: 0;
  }
  .page-about .about-origin,
  .page-about .about-timeline,
  .page-about .about-data,
  .page-about .about-team,
  .page-about .about-principles-section,
  .page-about .about-community,
  .page-about .about-trust,
  .page-about .about-next {
    padding: 72px 0;
  }
}

@media (hover: hover) and (min-width: 768px) {
  .page-about .about-team__hint {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    transition: max-height 0.3s var(--oy-ease), opacity 0.3s var(--oy-ease),
      margin-top 0.3s var(--oy-ease);
  }
  .page-about .about-team__block:hover .about-team__hint,
  .page-about .about-team__block:focus-within .about-team__hint {
    max-height: 80px;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__dot,
  .page-about .about-axis__ver,
  .page-about .about-team__block,
  .page-about .about-team__hint,
  .page-about .about-principle,
  .page-about .about-next__link,
  .page-about .about-timeline__indexlink,
  .page-about .about-fold > summary,
  .page-about .about-fold > summary::before {
    transition: none;
  }
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
  .page-about .about-axis__item:target .about-axis__dot {
    transform: none;
  }
}