.page-about {
  --about-rail: 196px;
  --about-gap: clamp(26px, 4vw, 56px);
  color: var(--ink);
  padding-bottom: clamp(48px, 8vw, 110px);
}

.page-about .breadcrumbs {
  margin-top: clamp(12px, 2vw, 20px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(14px, 2.4vw, 26px);
  padding: 0;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  background: var(--space-1);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 84% 10%, rgba(122, 92, 255, 0.4), transparent 56%),
    linear-gradient(158deg, rgba(7, 11, 24, 0.55) 0%, rgba(7, 11, 24, 0.94) 62%, var(--space-0) 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding: clamp(26px, 5.5vw, 76px) clamp(20px, 4.5vw, 64px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 64px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 3.4vw, 44px);
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  min-width: 96px;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  margin-bottom: 4px;
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(2) .about-stat__num {
  color: var(--gold);
}

.page-about .about-stat:nth-child(3) .about-stat__num,
.page-about .about-stat:nth-child(4) .about-stat__num {
  color: var(--ink);
}

.page-about .about-stat__unit {
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--ink-dim);
  margin-left: 4px;
  letter-spacing: 0.04em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  margin-top: clamp(30px, 5vw, 68px);
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--violet);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  background: rgba(20, 31, 61, 0.6);
  color: var(--ink-dim);
  font-size: 13.5px;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  border-color: var(--cyan);
  background: rgba(53, 230, 224, 0.1);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--violet);
}

.page-about .about-sections {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid rgba(122, 92, 255, 0.32);
}

.page-about .about-section:first-child {
  border-top-color: rgba(122, 92, 255, 0.5);
  padding-top: clamp(6px, 1.5vw, 14px);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-section__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--space-1);
  background: var(--violet);
  padding: 3px 8px;
  border-radius: var(--r-sm);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .about-text {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-text + .about-text {
  margin-top: 14px;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  padding: 16px 0 16px 18px;
  border-left: 2px solid var(--violet);
  background: linear-gradient(90deg, rgba(122, 92, 255, 0.12), transparent 70%);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .about-line__title {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-line__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 编号网格 ---------- */
.page-about .about-num-grid {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-num-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  padding: 13px 15px;
  border-radius: var(--r-md);
  background: var(--panel);
  border: 1px solid var(--line-soft);
}

.page-about .about-num-item__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  padding-top: 2px;
}

.page-about .about-num-item__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-num-item__desc {
  grid-column: 2;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  margin-top: 24px;
  align-items: center;
}

.page-about .team-ring {
  position: relative;
  width: min(250px, 76vw);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 50%;
  background: conic-gradient(
    var(--violet) 0 38.2%,
    var(--cyan) 38.2% 64.7%,
    var(--gold) 64.7% 82.3%,
    var(--red) 82.3% 91.1%,
    #4a5f95 91.1% 100%
  );
  box-shadow: 0 0 70px -24px rgba(122, 92, 255, 0.9);
}

.page-about .team-ring::before {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  background: var(--space-1);
  border: 1px solid var(--line-soft);
}

.page-about .team-ring__core {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 2px;
  text-align: center;
  z-index: 1;
}

.page-about .team-ring__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--ink);
}

.page-about .team-ring__label {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}

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

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 5px 13px;
  padding-block: 11px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-legend__item:first-child {
  padding-top: 0;
}

.page-about .team-legend__dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--violet);
}

.page-about .team-legend__item:nth-child(2) .team-legend__dot {
  background: var(--cyan);
}

.page-about .team-legend__item:nth-child(3) .team-legend__dot {
  background: var(--gold);
}

.page-about .team-legend__item:nth-child(4) .team-legend__dot {
  background: var(--red);
}

.page-about .team-legend__item:nth-child(5) .team-legend__dot {
  background: #4a5f95;
}

.page-about .team-legend__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-legend__count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--ink-dim);
  margin-left: 8px;
}

.page-about .team-legend__desc {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-dim);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel);
}

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

.page-about .about-figure__cap {
  padding: 11px 15px;
  font-size: 12.8px;
  line-height: 1.7;
  color: var(--ink-dim);
  background: rgba(20, 31, 61, 0.75);
}

/* ---------- 工序 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(135deg, rgba(20, 31, 61, 0.9), rgba(14, 23, 48, 0.6));
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-step__title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-step__desc {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--violet), var(--cyan) 62%, rgba(53, 230, 224, 0));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 10px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 15px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--space-1);
  border: 2px solid var(--violet);
  box-shadow: 0 0 14px rgba(122, 92, 255, 0.85);
}

.page-about .about-timeline__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 14px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  cursor: pointer;
  list-style: none;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-timeline__summary:hover,
.page-about .about-timeline__summary:focus-visible {
  background: rgba(122, 92, 255, 0.1);
  border-color: var(--line-soft);
  outline: none;
}

.page-about .about-timeline__summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--violet);
}

.page-about .about-timeline__details[open] .about-timeline__summary::after {
  content: "－";
  color: var(--cyan);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-timeline__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__body {
  padding: 2px 14px 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
  max-width: 62ch;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 0;
  margin-top: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-partner {
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  display: grid;
  gap: 6px;
}

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

.page-about .about-partner__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-dim);
  max-width: 60ch;
}

/* ---------- 联系 ---------- */
.page-about .about-contact-list {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-contact-item {
  display: grid;
  gap: 3px;
  padding: 12px 15px;
  border-radius: var(--r-md);
  background: var(--panel);
  border: 1px solid var(--line-soft);
}

.page-about .about-contact-item__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}

.page-about .about-contact-item__value {
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-cta {
  margin-top: 24px;
  padding: clamp(22px, 3.6vw, 38px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(122, 92, 255, 0.38);
  background:
    radial-gradient(circle at 88% 8%, rgba(53, 230, 224, 0.16), transparent 58%),
    linear-gradient(135deg, rgba(122, 92, 255, 0.18), rgba(14, 23, 48, 0.9));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .about-num-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-contact-item:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  }

  .page-about .about-step {
    grid-template-columns: 74px minmax(0, 1fr);
    align-items: start;
    gap: 4px 14px;
  }

  .page-about .about-step__idx {
    padding-top: 4px;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(22px, 3vw, 40px);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: clamp(88px, 12vh, 124px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    padding: 9px 12px;
    border-color: transparent;
    background: transparent;
    border-radius: var(--r-sm);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    transform: translateX(3px);
  }

  .page-about .about-section {
    padding-block: clamp(30px, 3.6vw, 52px);
  }
}

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

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    transform: none;
  }
}