.page-about {
  --ab-radius: 14px;
  --ab-slant: 38px;
  color: var(--deep);
  background-color: var(--fog);
  padding-bottom: 4px;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 46px;
  background:
    radial-gradient(120% 82% at 92% -12%, rgba(183, 242, 74, 0.26), rgba(183, 242, 74, 0) 62%),
    radial-gradient(90% 70% at -12% 112%, rgba(255, 122, 61, 0.14), rgba(255, 122, 61, 0) 60%);
}

.page-about .about-hero .kit-crumbs {
  margin-bottom: 26px;
}

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

.page-about .about-hero__text .kit-h1 {
  margin: 10px 0 16px;
}

.page-about .about-hero__text .kit-text {
  margin-top: 14px;
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-frame {
  margin: 0;
  padding: 10px 10px 0;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 30px 52px -38px rgba(11, 31, 27, 0.55);
  position: relative;
}

.page-about .about-frame::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px dashed rgba(11, 31, 27, 0.14);
  border-radius: 5px;
  pointer-events: none;
}

.page-about .about-frame__win {
  position: relative;
  overflow: hidden;
  background: var(--fog);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}

.page-about .about-frame__win img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-frame__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 4px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-frame__cap .kit-mono {
  color: var(--orange);
  letter-spacing: 0.08em;
}

/* ---------- 通用区块 ---------- */
.page-about .about-sec {
  padding: 44px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec__head {
  max-width: 60ch;
  margin-bottom: 26px;
}

.page-about .about-sec__head .kit-h2 {
  margin: 8px 0 12px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 26px;
}

.page-about .about-origin__body .kit-text {
  max-width: 56ch;
}

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

.page-about .about-origin__facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-origin__facts li {
  padding: 6px 0 6px 14px;
  border-left: 2px solid var(--lime);
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-origin__facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--deep);
}

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

.page-about .about-origin__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 4px;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
}

.page-about .about-origin__media .kit-note {
  margin-top: 10px;
  font-size: 12px;
}

/* ---------- 年份时间线 ---------- */
.page-about .about-years {
  margin-top: 6px;
}

.page-about .about-years .kit-faq__item {
  border-top: 1px solid var(--line);
}

.page-about .about-years .kit-faq__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-years .kit-faq__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  padding: 20px 0;
  background: none;
  border: 0;
  font-family: inherit;
  font-size: 16px;
  color: var(--deep);
  text-align: left;
  cursor: pointer;
}

.page-about .about-years .kit-faq__q:hover .about-years__label,
.page-about .about-years .kit-faq__q:focus-visible .about-years__label {
  color: var(--orange);
}

.page-about .about-years .kit-faq__q:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 4px;
}

.page-about .about-years__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-years__label {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 600;
  transition: color 0.18s ease;
}

.page-about .about-years .kit-faq__icon {
  flex: 0 0 auto;
  color: var(--grey);
}

.page-about .about-years .kit-faq__a {
  padding: 0 0 22px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--grey);
}

.page-about .about-years .kit-faq__q[aria-expanded="false"] + .kit-faq__a,
.page-about .about-regions .kit-faq__q[aria-expanded="false"] + .kit-faq__a {
  display: none;
}

/* ---------- 新旧对照 ---------- */
.page-about .about-compare {
  margin-top: 4px;
}

.page-about .about-compare .kit-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-compare .kit-tabs__tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--deep);
  font-family: inherit;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-compare .kit-tabs__tab .kit-mono {
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-compare .kit-tabs__tab[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-compare .kit-tabs__tab[aria-selected="true"] .kit-mono {
  color: var(--ink);
}

.page-about .about-compare .kit-tabs__tab:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-compare .kit-tabs__panel {
  margin-top: 18px;
  padding: 20px;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
}

.page-about .about-compare__body {
  display: grid;
  gap: 18px;
}

.page-about .about-compare__body .kit-text {
  max-width: 40ch;
}

/* SVG 路径图 */
.page-about .about-diagram {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-diagram line {
  stroke: rgba(11, 31, 27, 0.16);
  stroke-width: 1;
  stroke-dasharray: 3 6;
}

.page-about .about-diagram .dg-path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-diagram .dg-dot {
  fill: var(--deep);
}

.page-about .about-diagram .dg-dot--end {
  fill: var(--lime);
  stroke: var(--deep);
  stroke-width: 2;
}

.page-about .about-diagram text {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  fill: var(--grey);
}

/* ---------- 旧路保留 ---------- */
.page-about .about-legacy__stack {
  position: relative;
}

.page-about .about-legacy__solid {
  padding: 26px 20px 96px;
  background: var(--mist);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: var(--ab-radius);
}

.page-about .about-legacy__solid .kit-text {
  max-width: 62ch;
}

.page-about .about-legacy__glass {
  margin: -78px 14px 0;
  padding: 20px;
  border-radius: 12px;
}

.page-about .about-legacy__glass .kit-h3 {
  margin-bottom: 10px;
}

.page-about .about-legacy__glass .kit-text {
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 16px;
}

.page-about .about-lines__item {
  position: relative;
  padding: 20px 20px 22px 22px;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
}

.page-about .about-lines__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: var(--lime);
}

.page-about .about-lines__item:nth-child(2)::before {
  background: var(--orange);
}

.page-about .about-lines__item:nth-child(3)::before {
  background: var(--dblue);
}

.page-about .about-lines__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-lines__item .kit-h3 {
  margin-bottom: 10px;
}

.page-about .about-lines__item .kit-text {
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

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

.page-about .about-team__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 6px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 92%);
}

.page-about .about-team__media .kit-note {
  margin-top: 10px;
  font-size: 12px;
}

.page-about .about-team__body .kit-h2 {
  margin: 8px 0 14px;
}

.page-about .about-team__body .kit-text {
  max-width: 54ch;
}

.page-about .about-team__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-team__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-top: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--deep);
}

.page-about .about-team__list li:last-child {
  border-bottom: 1px dashed var(--line);
}

.page-about .about-team__list .kit-mono {
  flex: 0 0 32px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-team__body .kit-note a {
  color: var(--deep);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

/* ---------- 规模 ---------- */
.page-about .about-scale {
  position: relative;
  overflow: hidden;
  padding: 28px 20px 30px;
  border-radius: var(--ab-radius);
  background: var(--indigo);
  color: var(--mist);
}

.page-about .about-scale::after {
  content: "";
  position: absolute;
  right: -22%;
  bottom: -58%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(62, 127, 163, 0.55), rgba(62, 127, 163, 0) 70%);
  pointer-events: none;
}

.page-about .about-scale .kit-eyebrow,
.page-about .about-scale .kit-eyebrow__num {
  color: var(--lime);
}

.page-about .about-scale .kit-h2 {
  margin: 10px 0 24px;
  color: var(--mist);
}

.page-about .about-scale__grid {
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .about-scale__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .about-scale__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 249, 246, 0.82);
}

.page-about .about-scale__note {
  position: relative;
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(244, 249, 246, 0.18);
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 249, 246, 0.9);
}

/* ---------- 地区折叠 ---------- */
.page-about .about-regions {
  margin-top: 30px;
}

.page-about .about-regions .kit-h3 {
  margin-bottom: 12px;
}

.page-about .about-regions .kit-faq__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-regions .kit-faq__q {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 15px 0;
  background: none;
  border: 0;
  font-family: inherit;
  font-size: 16px;
  color: var(--deep);
  text-align: left;
  cursor: pointer;
}

.page-about .about-regions .kit-faq__q:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-regions__code {
  flex: 0 0 34px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-regions__name {
  flex: 1 1 auto;
  font-weight: 600;
}

.page-about .about-regions .kit-faq__icon {
  flex: 0 0 auto;
  color: var(--grey);
}

.page-about .about-regions .kit-faq__a {
  padding: 0 0 16px 48px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 44px 0 64px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next .kit-h2 {
  margin: 8px 0 20px;
}

.page-about .about-next__links {
  display: grid;
  gap: 12px;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--deep);
  text-decoration: none;
  font-size: 16px;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--orange);
  background: #ffffff;
  transform: translateX(3px);
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-next__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-next__sub {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-next__arrow {
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--grey);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-origin__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

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

@media (min-width: 760px) {
  .page-about .about-sec {
    padding: 56px 0;
  }

  .page-about .about-sec__head {
    margin-bottom: 32px;
  }

  .page-about .about-hero {
    padding: 30px 0 58px;
  }

  .page-about .about-years .kit-faq__a {
    padding-left: 88px;
  }

  .page-about .about-compare .kit-tabs__panel {
    padding: 26px 28px;
  }

  .page-about .about-legacy__glass {
    max-width: 420px;
    margin: -96px 26px 0 auto;
    padding: 24px;
  }

  .page-about .about-legacy__solid {
    padding: 30px 28px 110px;
  }

  .page-about .about-regions .kit-faq__a {
    padding-left: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: end;
    gap: 44px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: 44px;
  }

  .page-about .about-compare__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 36px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .about-lines__item:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .about-lines__item:nth-child(3) {
    margin-top: 40px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    align-items: center;
    gap: 46px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scale {
    padding: 34px 36px 36px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-regions {
    margin-top: 34px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__text .kit-lead {
    max-width: 34ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .about-years__label,
  .page-about .about-compare .kit-tabs__tab {
    transition: none;
  }

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