.page-about {
  background: var(--ink-900);
  color: var(--ice);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 56px) clamp(36px, 5vw, 72px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(780px 380px at 88% -18%, rgba(32, 227, 210, .18), transparent 72%),
    radial-gradient(620px 320px at -8% 108%, rgba(255, 122, 26, .12), transparent 72%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 58, 82, .5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 82, .5) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: .32;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  align-items: center;
}

.page-about .breadcrumbs {
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.4vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ice);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* 首屏数据索引带 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stats__item {
  padding: 14px 16px;
  background: linear-gradient(180deg, rgba(10, 31, 51, .96), rgba(6, 18, 31, .96));
}

.page-about .about-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-stats__value--orange {
  color: var(--orange);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 4px;
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--mist);
}

/* 首屏主视觉 */
.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(32, 227, 210, .1), rgba(10, 31, 51, .9) 46%, rgba(6, 18, 31, .96));
  box-shadow: 0 26px 60px -36px rgba(0, 0, 0, .92);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2px solid var(--cyan);
  opacity: .7;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  left: -1px;
  top: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-l);
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: var(--radius-l);
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: calc(var(--radius-l) - 8px);
}

.page-about .about-hero__figcaption {
  margin-top: 10px;
  padding-inline: 4px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 索引 + 画布 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  padding-block: clamp(36px, 5vw, 76px);
}

.page-about .about-index {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(10, 31, 51, .92), rgba(6, 18, 31, .92));
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-index__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-radius: var(--radius-s);
  border-left: 2px solid transparent;
  color: var(--ice);
  font-size: .9375rem;
  line-height: 1.5;
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--line-dim);
  transition: color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  background: rgba(32, 227, 210, .08);
  border-left-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-index__list a:hover .about-index__num,
.page-about .about-index__list a:focus-visible .about-index__num {
  color: var(--cyan);
}

.page-about .about-index__cta {
  display: inline-flex;
  width: 100%;
  justify-content: center;
  margin-top: 14px;
}

.page-about .about-canvas {
  display: grid;
  gap: clamp(34px, 5vw, 60px);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: 110px;
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-section__num {
  color: var(--cyan);
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3.4vw, 1.875rem);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--ice);
}

.page-about .about-section__intro {
  margin: 0;
  max-width: 66ch;
  color: var(--mist);
  line-height: 1.85;
}

/* ---------- 01 原则卡 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 16px;
}

.page-about .principle-card {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .principle-card::before {
  content: "";
  position: absolute;
  right: -64px;
  top: -72px;
  width: 190px;
  height: 190px;
  border-radius: 46% 54% 60% 40% / 52% 44% 56% 48%;
  background: radial-gradient(circle at 35% 35%, rgba(32, 227, 210, .32), transparent 68%);
  transition: transform var(--dur) var(--ease);
  pointer-events: none;
}

.page-about .principle-card:nth-child(2)::before {
  background: radial-gradient(circle at 40% 40%, rgba(255, 122, 26, .3), transparent 68%);
}

.page-about .principle-card:nth-child(3)::before {
  background: radial-gradient(circle at 45% 40%, rgba(139, 123, 255, .3), transparent 68%);
}

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

.page-about .principle-card:hover::before {
  transform: scale(1.08);
}

.page-about .principle-card > * {
  position: relative;
}

.page-about .principle-card h3 {
  margin: 14px 0 0;
  font-size: 1.0625rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ice);
}

.page-about .principle-card p {
  margin: 10px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .principle-card__foot {
  padding-top: 12px;
  margin-top: 14px !important;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: .75rem !important;
  line-height: 1.7 !important;
  letter-spacing: .01em;
  color: var(--line-dim) !important;
}

/* ---------- 02 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(32, 227, 210, .28) 38%, var(--line));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(32, 227, 210, .12);
}

.page-about .timeline__node {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease);
}

.page-about .timeline__node:hover,
.page-about .timeline__node[open] {
  border-color: rgba(32, 227, 210, .45);
}

.page-about .timeline__node summary {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 14px 40px 14px 16px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .timeline__node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--radius-m);
}

.page-about .timeline__node summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--cyan);
}

.page-about .timeline__node[open] summary::after {
  content: "−";
}

.page-about .timeline__tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  padding: 2px 7px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line);
  color: var(--cyan);
  background: rgba(32, 227, 210, .08);
}

.page-about .timeline__title {
  font-size: .9375rem;
  line-height: 1.55;
  font-weight: 600;
  color: var(--ice);
}

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

.page-about .timeline__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, rgba(10, 31, 51, .95), rgba(6, 18, 31, .95));
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius-l) - 6px);
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 12 / 5;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  padding-inline: 4px;
  font-family: var(--font-mono);
  font-size: .75rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .team-list__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 16px 16px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-m);
  background: var(--ink-800);
}

.page-about .team-list__item--plain {
  border-left-color: var(--violet);
}

.page-about .team-list__num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .team-list__num--plain {
  color: var(--violet);
}

.page-about .team-list__item h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .team-list__item p {
  margin: 6px 0 0;
  font-size: .9063rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 04 流程 ---------- */
.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  counter-reset: about-flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(170deg, rgba(14, 41, 66, .9), rgba(10, 31, 51, .95));
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 34px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .about-flow__index {
  display: block;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-flow__step h3 {
  margin: 10px 0 0;
  font-size: 1.0625rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-flow__step p {
  margin: 8px 0 0;
  font-size: .9063rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-flow__note {
  margin: 16px 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-flow__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(32, 227, 210, .4);
}

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

/* ---------- 05 生态 ---------- */
.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-stats__item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(10, 31, 51, .7);
}

.page-about .eco-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.8vw, 1.75rem);
  color: var(--ice);
}

.page-about .eco-stats__unit {
  font-size: .7em;
  color: var(--orange);
  margin-left: 2px;
}

.page-about .eco-stats__label {
  display: block;
  margin-top: 6px;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .eco-honor {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid rgba(82, 224, 138, .34);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(82, 224, 138, .09), rgba(10, 31, 51, .9) 62%);
}

.page-about .eco-honor p {
  margin: 10px 0 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 06 联系 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid rgba(32, 227, 210, .34);
  border-radius: var(--radius-l);
  background:
    radial-gradient(520px 220px at 100% 0%, rgba(32, 227, 210, .14), transparent 70%),
    linear-gradient(150deg, rgba(10, 31, 51, .96), rgba(6, 18, 31, .96));
}

.page-about .about-contact__copy h3 {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-contact__list {
  margin: 12px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  list-style: square;
}

.page-about .about-contact__list li {
  font-size: .9063rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-contact__list li::marker {
  color: var(--cyan);
}

.page-about .about-contact__cta {
  margin-top: 20px;
  display: inline-flex;
}

.page-about .about-contact__channels {
  margin: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .about-contact__row {
  padding: 12px 14px;
  background: rgba(6, 18, 31, .92);
}

.page-about .about-contact__row dt {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--line-dim);
}

.page-about .about-contact__row dd {
  margin: 4px 0 0;
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

.page-about .about-contact__row dd a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(32, 227, 210, .35);
}

.page-about .about-contact__row dd a:hover,
.page-about .about-contact__row dd a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-contact__row dd a:focus-visible,
.page-about .about-hero__actions a:focus-visible,
.page-about .about-index__cta:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

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

@media (min-width: 880px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    align-items: start;
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}