.page-about {
  --about-line: rgba(126, 155, 181, 0.22);
  --about-line-soft: rgba(126, 155, 181, 0.14);
  --about-ink-soft: rgba(10, 15, 20, 0.8);
  --about-white-soft: rgba(234, 242, 255, 0.74);
  background: var(--navy);
  color: var(--white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 84% 8%, rgba(22, 194, 168, 0.16), transparent 66%),
    radial-gradient(48% 56% at 4% 94%, rgba(255, 106, 43, 0.1), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(126, 155, 181, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 155, 181, 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin-bottom: 26px;
}

.page-about .breadcrumb a {
  color: var(--tide);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  color: rgba(126, 155, 181, 0.5);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--lime);
  border: 1px solid rgba(200, 255, 77, 0.34);
  background: rgba(200, 255, 77, 0.06);
  border-radius: 999px;
  padding: 6px 14px;
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 20px 0 0;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 35em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--about-white-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stat {
  background: var(--navy);
  padding: 15px 14px 16px;
}

.page-about .about-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stat b small {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(200, 255, 77, 0.72);
  margin-left: 3px;
}

.page-about .about-hero__stat span {
  display: block;
  margin-top: 6px;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid rgba(22, 194, 168, 0.28);
  background: var(--deep);
  clip-path: polygon(26px 0, 100% 0, 100% 100%, 0 100%, 0 26px);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__badge {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--lime);
  background: rgba(6, 28, 51, 0.88);
  border: 1px solid rgba(200, 255, 77, 0.38);
}

/* ---------- 起点面板 ---------- */

.page-about .about-origin {
  padding: 4px 0 52px;
}

.page-about .about-origin__panel {
  background: var(--paper);
  color: var(--ink);
  padding: 34px 22px 36px;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-about .about-origin__kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  color: var(--signal);
  border-bottom: 2px solid var(--signal);
  padding-bottom: 6px;
  margin-bottom: 18px;
}

.page-about .about-origin__panel h2 {
  font-family: var(--font-head);
  font-size: clamp(1.45rem, 3.6vw, 2.2rem);
  line-height: 1.28;
  font-weight: 700;
  margin: 0 0 20px;
  color: var(--ink);
}

.page-about .about-origin__panel p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--about-ink-soft);
}

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

/* ---------- 通用栏目标题 ---------- */

.page-about .about-head {
  display: grid;
  gap: 12px;
  max-width: 62ch;
  margin-bottom: 32px;
}

.page-about .about-head__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  color: var(--tide);
  text-transform: uppercase;
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.9vw, 2.35rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-head p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--about-white-soft);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history {
  padding: 52px 0;
}

.page-about .about-history__layout {
  display: grid;
  gap: 26px;
}

.page-about .about-history__nav ul {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-history__nav ul::-webkit-scrollbar {
  display: none;
}

.page-about .about-history__nav a {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-decoration: none;
  padding: 6px 10px;
  border-bottom: 2px solid rgba(126, 155, 181, 0.25);
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-history__nav a:hover,
.page-about .about-history__nav a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .about-history__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-history__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 34px;
  border-left: 2px dashed rgba(22, 194, 168, 0.38);
}

.page-about .about-era {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 9px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--tide);
  box-shadow: 0 0 0 4px rgba(22, 194, 168, 0.14);
}

.page-about .about-era__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-era__season {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-era__card {
  background: linear-gradient(140deg, rgba(14, 42, 74, 0.95), rgba(6, 28, 51, 0.92));
  border: 1px solid var(--about-line);
  padding: 18px 20px 20px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-era__card:hover {
  border-color: var(--tide);
  transform: translateY(-2px);
}

.page-about .about-era__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-era__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-white-soft);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  padding: 52px 0;
}

.page-about .about-team__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .about-team__tab {
  display: grid;
  gap: 6px;
  text-align: left;
  padding: 15px 15px 17px;
  background: rgba(14, 42, 74, 0.7);
  border: 1px solid var(--about-line);
  color: var(--white);
  font-family: var(--font-body);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.page-about .about-team__tab:hover {
  transform: translateY(-2px);
  border-color: var(--tide);
}

.page-about .about-team__tab[aria-selected="true"] {
  background: rgba(22, 194, 168, 0.14);
  border-color: var(--tide);
}

.page-about .about-team__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 8px rgba(200, 255, 77, 0.7);
}

.page-about .about-team__name {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-team__meta {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-team__panel {
  background: var(--paper);
  color: var(--ink);
  padding: 24px 22px 26px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

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

.page-about .about-team__panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__panel p {
  margin: 0 0 12px;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .about-team__panel ul {
  margin: 0;
  padding-left: 18px;
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-team__panel li::marker {
  color: var(--signal);
}

.page-about .about-team__media {
  margin: 28px 0 0;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

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

/* ---------- 内容体系 ---------- */

.page-about .about-system {
  padding: 52px 0;
}

.page-about .about-system__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-system__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-system__item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-system__link {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 18px 6px;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s ease;
}

.page-about .about-system__link:hover {
  background: rgba(22, 194, 168, 0.08);
}

.page-about .about-system__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--tide);
}

.page-about .about-system__name {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-system__desc {
  display: block;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--about-white-soft);
}

.page-about .about-system__aside {
  align-self: start;
  background: rgba(14, 42, 74, 0.62);
  border: 1px solid var(--about-line);
  padding: 24px 22px 26px;
  clip-path: polygon(18px 0, 100% 0, 100% 100%, 0 100%, 0 18px);
}

.page-about .about-system__aside h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-system__aside p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--about-white-soft);
}

.page-about .about-system__taglist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

/* ---------- 更新节奏 ---------- */

.page-about .about-rhythm {
  padding: 52px 0;
}

.page-about .about-rhythm__board {
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-rhythm__cell {
  background: var(--navy);
  padding: 22px 18px 24px;
}

.page-about .about-rhythm__label {
  display: block;
  margin-bottom: 12px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-rhythm__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rhythm__note {
  display: block;
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.72;
  color: rgba(234, 242, 255, 0.6);
}

/* ---------- 服务能力与覆盖 ---------- */

.page-about .about-reach {
  padding: 52px 0;
}

.page-about .about-reach__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-reach__donut {
  position: relative;
  width: min(230px, 100%);
  margin: 0 auto;
}

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

.page-about .about-reach__donut-value {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
}

.page-about .about-reach__donut-value strong {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach__donut-value span {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-reach__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-reach__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-reach__item b {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach__item span {
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--about-white-soft);
}

/* ---------- 合作与荣誉 ---------- */

.page-about .about-partners {
  padding: 52px 0 60px;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-partners__cell {
  background: var(--navy);
  padding: 24px 20px 26px;
  border-top: 3px solid rgba(255, 106, 43, 0.72);
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__cell h3 {
  margin: 10px 0 10px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-partners__cell p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--about-white-soft);
}

.page-about .about-partners__media {
  margin: 32px 0 0;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-partners__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

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

.page-about .about-cta a {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--tide);
  border: 1px solid rgba(22, 194, 168, 0.5);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-cta a:hover {
  background: rgba(22, 194, 168, 0.14);
}

.page-about .about-cta a[data-emphasis] {
  background: var(--signal);
  border-color: var(--signal);
  color: #1a0a02;
  font-weight: 700;
}

.page-about .about-cta a[data-emphasis]:hover {
  background: #ff7f47;
}

.page-about .about-partners__legal {
  margin: 28px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-reach__donut {
    width: min(260px, 100%);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 68px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 54px;
  }

  .page-about .about-origin__panel {
    padding: 52px 60px 56px;
  }

  .page-about .about-head {
    margin-bottom: 40px;
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-system__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-reach__item {
    grid-template-columns: 5.5em minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

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

@media (min-width: 1024px) {
  .page-about .about-history__layout {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-history__nav {
    position: sticky;
    top: 96px;
  }

  .page-about .about-history__nav ul {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-history__nav a {
    border-bottom: 0;
    border-left: 2px solid rgba(126, 155, 181, 0.25);
    padding: 7px 10px;
  }

  .page-about .about-era {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
    padding-bottom: 30px;
  }

  .page-about .about-era__mark {
    flex-direction: column;
    gap: 4px;
    margin-bottom: 0;
    padding-top: 15px;
  }

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

  .page-about .about-era__card {
    padding: 22px 26px 24px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-rhythm__board {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 1079px) and (min-width: 700px) {
  .page-about .about-rhythm__board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era__card,
  .page-about .about-team__tab,
  .page-about .about-system__link,
  .page-about .about-cta a {
    transition: none;
  }

  .page-about .about-era__card:hover,
  .page-about .about-team__tab:hover {
    transform: none;
  }
}