.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: clip;
  padding-bottom: 0;
}

/* ---------- 开篇 ---------- */
.page-about .about-open {
  padding: 28px 0 64px;
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(200, 255, 61, 0.07) 0%, transparent 58%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 74%);
}

.page-about .about-open__grid {
  display: grid;
  gap: 36px;
  margin-top: 26px;
}

.page-about .about-open__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-open h1 {
  margin: 0;
  font-size: clamp(34px, 8.5vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  font-stretch: 90%;
  color: var(--paper);
}

.page-about .about-open__lede {
  margin: 24px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--sheet);
}

.page-about .about-open__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-open__meta {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute-2);
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--card);
  overflow: hidden;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .about-figure__cap {
  display: block;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute);
  background: var(--card);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  padding: 60px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block--scenes {
  background: var(--ink);
}

.page-about .about-block--scale {
  background: var(--ink-2);
}

.page-about .about-block--cadence {
  background:
    linear-gradient(135deg, rgba(200, 255, 61, 0.08) 0%, transparent 42%),
    var(--ink);
}

.page-about .about-block--team {
  background: var(--ink-2);
}

.page-about .about-block--timeline {
  background: var(--ink);
}

.page-about .about-block--partner {
  background: var(--ink-2);
}

.page-about .about-block--next {
  background:
    radial-gradient(90% 120% at 10% 100%, rgba(255, 106, 43, 0.09) 0%, transparent 60%),
    var(--ink);
}

.page-about .about-block__inner {
  display: grid;
  gap: 28px;
}

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

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 52px;
  line-height: 1;
  font-weight: 700;
  color: var(--ink-2);
  -webkit-text-stroke: 1px var(--line);
  letter-spacing: -0.03em;
}

.page-about .about-side-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-h2 {
  margin: 0;
  font-size: clamp(24px, 5.4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  font-weight: 800;
  font-stretch: 90%;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--sheet);
}

.page-about .about-note {
  margin: 22px 0 0;
  max-width: 46ch;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 三场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 0;
  margin-top: 34px;
  border-top: 1px solid var(--line);
}

.page-about .about-scene {
  padding: 24px 0 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scene__title {
  margin: 14px 0 10px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-scene__text {
  margin: 0 0 14px;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 规模数字 ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-num-item {
  padding: 20px 16px 22px;
  background: var(--card);
}

.page-about .about-num-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute-2);
}

.page-about .about-num-item dd {
  margin: 10px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-num-value {
  font-family: var(--font-mono);
  font-size: clamp(38px, 11vw, 62px);
  line-height: 0.95;
  font-weight: 700;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-num-unit {
  font-size: 14px;
  color: var(--mute);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  margin: 34px 0 0;
  padding-left: 22px;
  position: relative;
}

.page-about .about-cadence::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--line) 100%);
}

.page-about .about-cadence__line {
  position: relative;
  padding: 0 0 22px 0;
  display: grid;
  gap: 4px;
}

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

.page-about .about-cadence__dot {
  position: absolute;
  left: -22px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
}

.page-about .about-cadence__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-cadence__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--sheet);
}

/* ---------- 团队 ---------- */
.page-about .about-team__fig {
  margin: 32px 0 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--card);
  overflow: hidden;
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.05);
}

.page-about .about-team__fig figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute);
}

.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-role {
  padding: 18px 18px 20px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: 5px 5px 0 rgba(5, 19, 15, 0.55);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 36px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--line) 88%);
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 30px;
}

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

.page-about .about-tl__dot {
  position: absolute;
  left: -25px;
  top: 5px;
  width: 12px;
  height: 4px;
  background: var(--lime);
}

.page-about .about-tl--now .about-tl__dot {
  width: 20px;
  background: var(--signal);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-tl--now .about-tl__year {
  color: var(--signal);
}

.page-about .about-tl__name {
  margin: 8px 0 8px;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

.page-about .about-timeline__fig {
  margin: 36px 0 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--card);
  overflow: hidden;
}

.page-about .about-timeline__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.88;
}

.page-about .about-timeline__fig figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute);
}

/* ---------- 协作与行业观察 ---------- */
.page-about .about-quote {
  margin: 30px 0 0;
  position: relative;
}

.page-about .about-quote p {
  margin: 0;
  font-size: 17px;
  line-height: 1.82;
  color: #14261F;
}

.page-about .about-partner__marks {
  display: grid;
  gap: 16px;
  margin-top: 32px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-mark {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-mark__num {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  color: var(--aqua);
  font-variant-numeric: tabular-nums;
}

.page-about .about-mark__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--sheet);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-next__card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 6px 16px;
  padding: 20px 20px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--card-hi);
  border-color: var(--lime-dim);
  transform: translateY(-2px);
}

.page-about .about-next__label {
  grid-column: 1;
  font-size: 18px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-next__desc {
  grid-column: 1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-next__go {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--lime);
  transition: transform 200ms var(--ease);
}

.page-about .about-next__card:hover .about-next__go,
.page-about .about-next__card:focus-visible .about-next__go {
  transform: translateX(5px);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-block {
    padding: 78px 0;
  }

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

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 26px;
    border-top: 0;
  }

  .page-about .about-scene {
    border-top: 1px solid var(--line);
    border-bottom: 0;
    padding: 22px 0 30px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner__marks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ---------- 桌面：左窄右宽的文字建筑 ---------- */
@media (min-width: 1024px) {
  .page-about .about-open {
    padding: 40px 0 96px;
  }

  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 72px;
  }

  .page-about .about-open__lede {
    font-size: 17px;
  }

  .page-about .about-figure {
    margin-top: 42px;
  }

  .page-about .about-block {
    padding: 104px 0;
  }

  .page-about .about-block__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-block__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: 88px;
  }

  .page-about .about-idx {
    font-size: 84px;
  }

  .page-about .about-num-item {
    padding: 26px 22px 28px;
  }

  .page-about .about-timeline {
    padding-left: 32px;
  }

  .page-about .about-tl__dot {
    left: -33px;
  }

  .page-about .about-timeline::before {
    left: 4px;
  }

  .page-about .about-team__fig,
  .page-about .about-timeline__fig {
    margin-top: 40px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-block__inner {
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 80px;
  }

  .page-about .about-open__grid {
    gap: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-next__go {
    transition: none;
  }
}
</main>