.page-about {
  --about-rail-w: 88px;
  --about-rule-dark: rgba(47, 227, 224, 0.18);
  --about-rule-paper: rgba(44, 52, 68, 0.13);
  --about-ink-soft: rgba(232, 237, 247, 0.76);
  --about-ink-faint: rgba(232, 237, 247, 0.52);
}

@media (min-width: 900px) {
  .page-about {
    --about-rail-w: 156px;
  }
}

.page-about > section {
  padding-block: clamp(56px, 8vw, 104px);
}

.page-about > .about-hero {
  padding-block: clamp(20px, 3vw, 34px) clamp(48px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(22px, 3.5vw, 38px);
  padding: clamp(24px, 4vw, 52px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--line-dark);
  background: linear-gradient(168deg, rgba(16, 26, 71, 0.9) 0%, rgba(7, 12, 24, 0.97) 62%);
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 1px solid var(--cyan-400);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero h1 {
  margin: 0.45em 0 0.5em;
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ink-text);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 52ch;
  font-family: var(--font-editorial);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px dashed var(--line-soft);
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: -0.02em;
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 0.7em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--about-ink-faint);
}

/* ---------- 出发点 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }
}

.page-about .about-split__lead h2 {
  margin: 0.4em 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper-text);
  max-width: 20ch;
}

.page-about .about-split__body {
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .about-split__body .prose {
  margin: 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper-text);
}

.page-about .about-dropcap {
  float: left;
  margin: 0.04em 0.14em 0 0;
  font-family: var(--font-editorial);
  font-size: 3.1em;
  font-weight: 600;
  line-height: 0.86;
  color: var(--indigo-900);
}

/* ---------- 生产流程 ---------- */

.page-about .about-steps {
  margin-top: clamp(30px, 4vw, 52px);
}

.page-about .about-step {
  position: relative;
  padding-left: clamp(18px, 2.6vw, 30px);
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-step:last-of-type {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(47, 227, 224, 0.55), rgba(47, 227, 224, 0.06));
}

.page-about .about-step summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: clamp(16px, 2.3vw, 26px) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step summary::marker {
  content: "";
}

.page-about .about-step__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .about-step__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-text);
}

.page-about .about-step__meta {
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--about-ink-faint);
}

.page-about .about-step[open] summary {
  padding-bottom: clamp(8px, 1.2vw, 12px);
}

.page-about .about-step__panel {
  padding: 0 0 clamp(18px, 2.4vw, 28px);
}

.page-about .about-step__panel p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-process__figure {
  margin: clamp(34px, 5vw, 60px) 0 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
}

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
    gap: clamp(40px, 5vw, 76px);
  }
}

.page-about .about-team__list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-paper);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 28px);
  align-items: start;
  padding: clamp(18px, 2.6vw, 26px) clamp(4px, 0.8vw, 10px);
  border-bottom: 1px solid var(--about-rule-paper);
  transition: background-color 260ms ease;
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  background: rgba(47, 227, 224, 0.09);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--indigo-900);
}

.page-about .about-team__role h3 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--paper-text);
}

.page-about .about-team__role p {
  margin: 0;
  max-width: 40ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-about .about-team__collab {
  display: block;
  margin-top: 0.85em;
  padding-left: 10px;
  border-left: 2px solid var(--paper-300);
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.07em;
  color: var(--slate-500);
  transition: color 260ms ease, border-color 260ms ease, transform 260ms ease;
}

.page-about .about-team__row:hover .about-team__collab,
.page-about .about-team__row:focus-within .about-team__collab {
  color: var(--indigo-600);
  border-left-color: var(--indigo-600);
  transform: translateX(3px);
}

.page-about .about-team__figure {
  margin: 0;
}

/* ---------- 赛季轨迹 ---------- */

.page-about .about-history__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

@media (min-width: 900px) {
  .page-about .about-history__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }
}

.page-about .about-history__rail .eyebrow {
  margin: 0 0 1.2em;
}

.page-about .about-history__ticks {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid rgba(47, 227, 224, 0.34);
}

@media (min-width: 900px) {
  .page-about .about-history__ticks {
    position: sticky;
    top: 0;
    flex-direction: column;
    gap: clamp(34px, 6vw, 76px);
  }
}

.page-about .about-history__ticks li {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--about-ink-faint);
}

.page-about .about-history__ticks li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: -18px;
  width: 10px;
  height: 1px;
  background: rgba(47, 227, 224, 0.55);
}

.page-about .about-history__ticks li:last-child {
  color: var(--amber-400);
}

.page-about .about-history__ticks li:last-child::before {
  background: var(--amber-400);
}

.page-about .about-history__list {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-history__item {
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-history__item:last-child {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-history__year {
  display: block;
  margin-bottom: 0.5em;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .about-history__item h3 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--ink-text);
}

.page-about .about-history__item p {
  margin: 0;
  max-width: 54ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-reach__figure {
  margin: clamp(30px, 4.5vw, 52px) 0 0;
}

.page-about .about-reach__list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  background: var(--indigo-900);
}

@media (min-width: 720px) {
  .page-about .about-reach__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-reach__item {
  padding: clamp(20px, 3vw, 30px) clamp(16px, 2vw, 24px);
  border-right: 1px solid var(--about-rule-dark);
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .about-reach__label {
  display: block;
  margin-top: 0.75em;
  font-size: 0.83rem;
  line-height: 1.55;
  color: var(--about-ink-soft);
}

.page-about .about-eco {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(32px, 4.5vw, 56px);
}

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

.page-about .about-eco__item {
  padding-top: clamp(16px, 2vw, 22px);
  border-top: 2px solid var(--paper-text);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-eco__item p {
  margin: 0.75em 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--slate-500);
}

/* ---------- 长期可用 ---------- */

.page-about .about-trust__grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(32px, 4vw, 52px);
}

@media (min-width: 860px) {
  .page-about .about-trust__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-trust__item {
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid rgba(47, 227, 224, 0.3);
}

.page-about .about-trust__item h3 {
  margin: 0 0 0.7em;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink-text);
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-trust__foot {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(36px, 5vw, 60px);
  padding-top: clamp(24px, 3.4vw, 38px);
  border-top: 1px dashed var(--line-soft);
}

@media (min-width: 820px) {
  .page-about .about-trust__foot {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-trust__foot p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .about-trust__actions .btn {
  flex: 0 0 auto;
}

/* ---------- 图表容器兜底 ---------- */

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

@media (max-width: 480px) {
  .page-about .about-step summary {
    gap: 6px 12px;
  }

  .page-about .about-step__meta {
    margin-left: 0;
    flex-basis: 100%;
  }

  .page-about .about-team__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-team__num {
    font-size: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__row,
  .page-about .about-team__collab {
    transition: none;
  }

  .page-about .about-team__row:hover .about-team__collab,
  .page-about .about-team__row:focus-within .about-team__collab {
    transform: none;
  }
}