.page-about {
  --about-sec-pad: clamp(40px, 6vw, 88px);
  --about-side-pad: clamp(16px, 3vw, 40px);
  background: var(--ink-900);
  color: var(--white-050);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 80% at 88% -10%, rgba(61, 242, 210, 0.14), transparent 62%),
    linear-gradient(180deg, #05141F 0%, #0A2740 100%);
  border-bottom: 2px solid var(--ink-700);
}

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

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--cool-400);
}

.page-about .breadcrumb a {
  color: var(--cool-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-kicker {
  margin: clamp(16px, 3vw, 28px) 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-40);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white-050);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--mist-200);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 2px solid var(--ink-700);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-fact__num em {
  font-style: normal;
  color: var(--orange-500);
}

.page-about .about-fact__txt {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--cool-400);
}

.page-about .about-hero__figure {
  margin: 0;
  aspect-ratio: 5 / 4;
  border: 2px solid var(--ink-700);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-hero__figure figcaption {
  padding: 8px 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--cool-400);
}

/* ---------- 页面骨架 ---------- */
.page-about .about-shell {
  padding-block: clamp(24px, 5vw, 56px) 0;
}

.page-about .about-index {
  margin-bottom: clamp(24px, 4vw, 44px);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink-700);
}

.page-about .about-index__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--cool-400);
}

.page-about .about-index__list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 4px 2px;
  white-space: nowrap;
  font-size: var(--fs-14);
  color: var(--cool-400);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--cyan-400);
}

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

/* ---------- 区块公共 ---------- */
.page-about .about-sec {
  position: relative;
  padding: var(--about-sec-pad) var(--about-side-pad);
  border-top: 2px solid var(--ink-700);
}

.page-about .about-sec--paper {
  background: var(--white-050);
  color: var(--ink-900);
  border-top-color: var(--mist-200);
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .about-sec__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .about-sec--paper .about-sec__num {
  color: var(--cyan-600);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-28);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lead {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--cool-400);
}

.page-about .about-sec--paper .about-sec__lead {
  color: var(--stone-600);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--stone-600);
}

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

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

.page-about .about-origin__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--ink-900);
  box-shadow: var(--shadow-hard-light);
  background: var(--mist-200);
}

.page-about .about-origin__fig figcaption {
  margin-top: 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--stone-600);
}

/* ---------- 流水线 ---------- */
.page-about .about-pipe {
  background: var(--ink-900);
}

.page-about .about-pipe__svg {
  display: none;
}

.page-about .about-pipe__svg path:first-child {
  fill: none;
  stroke: var(--cyan-600);
  stroke-width: 2;
  stroke-dasharray: 14 10;
}

.page-about .about-pipe__svg path:last-child {
  fill: var(--orange-500);
  stroke: none;
}

.page-about .about-pipe__steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding: 18px 16px 20px;
  background: var(--ink-800);
  border: 2px solid var(--ink-700);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--cyan-400);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-step__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--white-050);
}

.page-about .about-step__text {
  margin: 0 0 16px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--cool-400);
}

.page-about .about-step__meta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--yellow-400);
}

/* ---------- 分工档案卡 ---------- */
.page-about .about-crew__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-card {
  padding: 18px;
  background: #ffffff;
  border: 2px solid var(--ink-900);
  box-shadow: var(--shadow-hard-light);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink-900);
  outline: none;
}

.page-about .about-card:focus-visible {
  outline: 2px solid var(--cyan-600);
  outline-offset: 4px;
}

.page-about .about-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-card__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--ink-900);
}

.page-about .about-card__count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--orange-700);
}

.page-about .about-card__count small {
  margin-left: 2px;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  color: var(--stone-600);
}

.page-about .about-card__sum {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--stone-600);
}

.page-about .about-card__detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 2px dashed var(--mist-200);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--stone-600);
}

/* ---------- 伙伴名册 ---------- */
.page-about .about-partners {
  background: var(--ink-900);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-partner {
  padding: 18px 16px 20px;
  background: var(--ink-800);
  border: 2px solid var(--ink-700);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-40);
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-partner__name {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--white-050);
}

.page-about .about-partner p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--cool-400);
}

.page-about .about-partners__callout {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(18px, 3vw, 28px);
  background: var(--ink-800);
  border: 2px solid var(--orange-500);
  box-shadow: var(--shadow-hard);
}

.page-about .about-partners__callout-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--orange-500);
}

.page-about .about-partners__callout-text {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--mist-200);
}

/* ---------- 版本 ---------- */
.page-about .about-versions {
  overflow: hidden;
  background: var(--ink-900);
  border-top-color: var(--ink-700);
}

.page-about .about-versions__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-versions__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.24;
}

.page-about .about-versions__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 20, 31, 0.94) 0%, rgba(5, 20, 31, 0.86) 55%, rgba(5, 20, 31, 0.97) 100%);
}

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

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

.page-about .about-version__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-ver__tabs {
  display: grid;
  gap: 8px;
  padding-left: 12px;
  border-left: 2px solid var(--ink-700);
}

.page-about .about-ver__label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 12px;
  background: var(--ink-800);
  border: 2px solid var(--ink-700);
  cursor: pointer;
  color: var(--cool-400);
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .about-ver__label:hover {
  color: var(--white-050);
  border-color: var(--cyan-600);
}

.page-about .about-ver__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
}

.page-about .about-ver__name {
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about #about-ver-1:checked ~ .about-ver__tabs .about-ver__label--1,
.page-about #about-ver-2:checked ~ .about-ver__tabs .about-ver__label--2,
.page-about #about-ver-3:checked ~ .about-ver__tabs .about-ver__label--3,
.page-about #about-ver-4:checked ~ .about-ver__tabs .about-ver__label--4 {
  background: var(--ink-900);
  border-color: var(--orange-500);
  color: var(--white-050);
  box-shadow: inset 3px 0 0 var(--orange-500);
}

.page-about #about-ver-1:checked ~ .about-ver__tabs .about-ver__label--1 .about-ver__num,
.page-about #about-ver-2:checked ~ .about-ver__tabs .about-ver__label--2 .about-ver__num,
.page-about #about-ver-3:checked ~ .about-ver__tabs .about-ver__label--3 .about-ver__num,
.page-about #about-ver-4:checked ~ .about-ver__tabs .about-ver__label--4 .about-ver__num {
  color: var(--orange-500);
}

.page-about #about-ver-1:focus-visible ~ .about-ver__tabs .about-ver__label--1,
.page-about #about-ver-2:focus-visible ~ .about-ver__tabs .about-ver__label--2,
.page-about #about-ver-3:focus-visible ~ .about-ver__tabs .about-ver__label--3,
.page-about #about-ver-4:focus-visible ~ .about-ver__tabs .about-ver__label--4 {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .about-ver__panel {
  display: none;
  padding: clamp(18px, 3vw, 28px);
  background: rgba(10, 39, 64, 0.78);
  border: 2px solid var(--ink-700);
}

.page-about #about-ver-1:checked ~ .about-ver__panels .about-ver__panel--1,
.page-about #about-ver-2:checked ~ .about-ver__panels .about-ver__panel--2,
.page-about #about-ver-3:checked ~ .about-ver__panels .about-ver__panel--3,
.page-about #about-ver-4:checked ~ .about-ver__panels .about-ver__panel--4 {
  display: block;
}

.page-about .about-ver__panel-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--cyan-400);
}

.page-about .about-ver__panel p {
  margin: 0 0 12px;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .about-ver__panel-fix {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--yellow-400);
}

/* ---------- 气质 ---------- */
.page-about .about-spirit {
  overflow: hidden;
}

.page-about .about-spirit__contour {
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 300px;
  height: 300px;
  opacity: 0.5;
}

.page-about .about-spirit__contour path {
  fill: none;
  stroke: var(--cyan-600);
  stroke-width: 1.5;
  stroke-dasharray: 6 8;
}

.page-about .about-spirit__body {
  position: relative;
  max-width: 40em;
}

.page-about .about-spirit__body p {
  margin: 0 0 18px;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--stone-600);
}

.page-about .about-spirit__notes {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-spirit__notes li {
  padding: 8px 14px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--ink-900);
  border: 2px solid var(--ink-900);
  background: var(--mist-200);
}

/* ---------- 一起看 ---------- */
.page-about .about-together {
  background:
    radial-gradient(90% 120% at 10% 0%, rgba(255, 106, 31, 0.1), transparent 58%),
    var(--ink-900);
  padding-block: clamp(56px, 9vw, 128px);
}

.page-about .about-together__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-40);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white-050);
}

.page-about .about-together__lead {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 32em;
  font-size: var(--fs-20);
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .about-together__lead--dim {
  margin-top: 14px;
  font-size: var(--fs-17);
  color: var(--cool-400);
}

.page-about .about-together__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__title {
    font-size: var(--fs-64);
  }

  .page-about .about-sec__title {
    font-size: var(--fs-40);
  }

  .page-about .about-together__title {
    font-size: var(--fs-64);
  }

  .page-about .about-hero__figure {
    aspect-ratio: 5 / 5;
  }
}

@media (min-width: 820px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__figure {
    aspect-ratio: 5 / 6;
  }

  .page-about .about-pipe__svg {
    display: block;
    width: 100%;
    height: 20px;
    margin-bottom: 18px;
  }

  .page-about .about-pipe__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-version__switch {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-card__detail {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    opacity: 0;
    overflow: hidden;
    border-top-color: transparent;
    transition: max-height var(--ease), opacity var(--ease), padding var(--ease), margin var(--ease);
  }

  .page-about .about-card:hover .about-card__detail,
  .page-about .about-card:focus-visible .about-card__detail {
    max-height: 320px;
    margin-top: 12px;
    padding-top: 12px;
    opacity: 1;
    border-top-color: var(--mist-200);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 32px;
    margin-bottom: 0;
    padding: 0 0 0 14px;
    border-bottom: 0;
    border-left: 2px solid var(--ink-700);
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    justify-content: flex-start;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -16px;
    padding-left: 14px;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--orange-500);
    border-bottom-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-step,
  .page-about .about-ver__label,
  .page-about .about-card__detail {
    transition: none;
  }
}