.page-about {
  --about-hairline: rgba(79, 227, 224, 0.16);
  --about-hairline-soft: rgba(168, 182, 200, 0.16);
  --about-pad: clamp(14px, 3.4vw, 24px);
  color: var(--paper);
  background: var(--ink);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(20px, 3.4vw, 32px);
  padding: clamp(24px, 4.6vw, 56px) 0 clamp(34px, 6vw, 68px);
  border-bottom: 1px solid var(--about-hairline);
}

.page-about .about-hero__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 8.6vw, 82px);
  line-height: 0.98;
  letter-spacing: 0.02em;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-hero__body {
  display: grid;
  gap: 16px;
  max-width: var(--measure);
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-hero__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 事实条 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-hairline);
  border: 1px solid var(--about-hairline);
}

.page-about .about-facts__item {
  margin: 0;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .about-facts__label {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-facts__value {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 2vw, 19px);
  line-height: 1.2;
  color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    column-gap: clamp(40px, 6vw, 88px);
    row-gap: clamp(22px, 3vw, 38px);
    align-items: start;
  }
  .page-about .about-hero__index {
    grid-column: 1 / -1;
  }
  .page-about .about-hero__title {
    grid-column: 1;
    grid-row: 2;
  }
  .page-about .about-hero__body {
    grid-column: 2;
    grid-row: 2;
    padding-top: clamp(6px, 1.6vw, 24px);
  }
  .page-about .about-facts {
    grid-column: 1 / -1;
    grid-row: 3;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(38px, 6.4vw, 82px) 0;
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .about-section--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: clamp(22px, 1.6vw, 34px);
}

.page-about .about-head__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(25px, 4.4vw, 42px);
  line-height: 1.06;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-head--compact {
  margin-bottom: clamp(16px, 2.2vw, 22px);
}

.page-about .about-lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 起点叙述 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-origin__prose p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--paper);
}

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

.page-about .about-origin__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: var(--measure);
}

@media (min-width: 880px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(32px, 4.6vw, 64px);
    align-items: start;
  }
  .page-about .about-origin__prose:last-child {
    padding-top: clamp(18px, 3vw, 44px);
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-top: 6px;
}

.page-about .about-timeline__glow {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: var(--radius);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-timeline__glow img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: grayscale(0.35);
}

.page-about .about-timeline__track {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0 0 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--teal) transparent;
  cursor: grab;
}

.page-about .about-timeline__track:active {
  cursor: grabbing;
}

.page-about .about-timeline__track::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-timeline__track::-webkit-scrollbar-thumb {
  background: var(--teal);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 min(80vw, 300px);
  scroll-snap-align: start;
  border-top: 1px solid var(--teal);
  padding: 22px 26px 4px 0;
  transition: border-color 220ms var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(79, 227, 224, 0.12);
  transition: background-color 220ms var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-top-color: var(--coral);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--coral);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-timeline__hint {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--teal);
}

/* ---------- 团队 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-hairline);
  background: var(--panel);
}

.page-about .about-banner img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--about-hairline);
}

.page-about .about-teams {
  display: grid;
  gap: 0;
}

.page-about .about-teams__item {
  padding: clamp(18px, 3vw, 26px) 0;
}

.page-about .about-teams__item + .about-teams__item {
  border-top: 1px dashed var(--about-hairline-soft);
}

.page-about .about-teams__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.8vw, 26px);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-teams__meta {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-teams__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-teams__item {
    padding: 4px clamp(18px, 2.6vw, 32px);
  }
  .page-about .about-teams__item:first-child {
    padding-left: 0;
  }
  .page-about .about-teams__item:last-child {
    padding-right: 0;
  }
  .page-about .about-teams__item + .about-teams__item {
    border-top: 0;
    border-left: 1px dashed var(--about-hairline-soft);
  }
}

/* ---------- 原则贴纸 ---------- */
.page-about .about-principles {
  display: grid;
  gap: clamp(20px, 3vw, 26px);
}

.page-about .about-principle {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--about-hairline-soft);
  border-radius: var(--radius);
  margin-top: 10px;
  transition: border-color 200ms var(--ease);
}

.page-about .about-principle:hover {
  border-color: var(--about-hairline);
}

.page-about .about-principle__summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 26px var(--about-pad) 18px;
  cursor: pointer;
}

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

.page-about .about-principle__tag {
  position: absolute;
  top: -12px;
  left: 14px;
  transform: rotate(-1.6deg);
  padding: 3px 11px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.08em;
  border-radius: 2px;
  box-shadow: 2px 2px 0 rgba(10, 18, 32, 0.45);
}

.page-about .about-principle__toggle {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-principle__toggle::after {
  content: "展开 +";
}

.page-about .about-principle[open] .about-principle__toggle::after {
  content: "收起 −";
}

.page-about .about-principle__body {
  padding: 0 var(--about-pad) 22px;
}

.page-about .about-principle__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .about-principle:nth-child(2) {
    margin-top: 26px;
  }
}

/* ---------- 仪表板 ---------- */
.page-about .about-dash {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-dash__ring {
  justify-self: start;
  width: clamp(96px, 22vw, 132px);
}

.page-about .about-dash__ring svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-dash__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-hairline);
  border: 1px solid var(--about-hairline);
}

.page-about .about-dash__item {
  padding: clamp(16px, 2.6vw, 22px);
  background: var(--panel);
}

.page-about .about-dash__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-dash__unit {
  margin-left: 4px;
  font-size: 0.42em;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-dash__label {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--paper);
}

.page-about .about-dash__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-about .about-dash__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-dash {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }
  .page-about .about-dash__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
}

.page-about .about-eco__body p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper);
}

.page-about .about-eco__list {
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-hairline-soft);
  border-top: 1px solid var(--about-hairline-soft);
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .about-eco__list li {
  padding: 11px 2px;
  background: var(--ink);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px dashed var(--about-hairline-soft);
}

.page-about .about-eco__list li:first-child {
  border-top: 0;
}

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

.page-about .about-eco__figure {
  margin: 0;
  border: 1px solid var(--about-hairline);
  background: var(--panel);
}

.page-about .about-eco__figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-eco__figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--about-hairline);
}

@media (min-width: 880px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(32px, 4.6vw, 64px);
    align-items: start;
  }
  .page-about .about-eco__figure {
    margin-top: clamp(20px, 4vw, 58px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-timeline__item {
    transition: none;
  }
  .page-about .about-timeline__track {
    scroll-behavior: auto;
  }
}