.page-about {
  --about-rail: 208px;
  --about-gap: clamp(56px, 7vw, 104px);
  background: var(--c-cream);
  color: var(--text-light-1);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-indigo);
  color: var(--text-dark-1);
  padding: clamp(24px, 3.5vw, 40px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -35%;
  right: -10%;
  width: 46%;
  height: 190%;
  background: repeating-linear-gradient(
    90deg,
    rgba(241, 235, 223, 0.06) 0 1px,
    transparent 1px 56px
  );
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  bottom: -60%;
  width: 30%;
  height: 150%;
  background: var(--c-cyan);
  opacity: 0.05;
  transform: rotate(12deg);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb-link {
  color: var(--text-dark-2);
}

.page-about .about-hero .breadcrumb-item {
  color: var(--text-dark-3);
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(28px, 5vw, 56px);
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 16px 0 20px;
  max-width: 19ch;
  color: var(--text-dark-1);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  color: var(--text-dark-2);
  margin: 0;
}

.page-about .about-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  background: var(--c-cream);
  padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 112px);
}

.page-about .about-grid {
  display: grid;
  gap: clamp(28px, 4vw, 64px);
}

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

.page-about .about-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-stone);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 14px 0 4px;
  display: flex;
  gap: 22px;
  overflow-x: auto;
  border-top: 1px solid var(--line-light);
  scrollbar-width: thin;
}

.page-about .about-rail-item {
  position: relative;
  flex: none;
}

.page-about .about-rail-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.page-about .about-rail-value {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-rail-label {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-stone);
  white-space: nowrap;
}

.page-about .about-rail-link:hover .about-rail-value,
.page-about .about-rail-link:focus-visible .about-rail-value {
  color: var(--c-clay);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 14px;
  margin-bottom: 22px;
  border-top: 1px solid var(--c-ink);
}

.page-about .about-sec-num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .about-sec-head h2 {
  margin: 0;
}

.page-about .about-sec-lede {
  max-width: 68ch;
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-light-2);
}

.page-about .about-inline-cta {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-light-2);
}

.page-about .about-inline-cta a {
  color: var(--c-clay);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-inline-cta a:hover {
  color: var(--c-ink);
}

/* ---------- 规格牌 ---------- */
.page-about .about-placard-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-placard-row--compact {
  margin-top: 24px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team-card {
  background: var(--c-paper);
  border: 1px solid var(--line-light);
  border-top: 3px solid var(--c-moss);
  padding: 22px 20px 24px;
  transition: transform var(--dur) var(--ease), outline-color var(--dur) var(--ease);
  outline: 1px solid transparent;
  outline-offset: -1px;
}

.page-about .about-team-card:nth-child(2) {
  border-top-color: var(--c-clay);
}

.page-about .about-team-card:nth-child(3) {
  border-top-color: var(--c-indigo);
}

.page-about .about-team-card:hover {
  transform: translateY(-2px);
  outline-color: var(--c-cyan);
}

.page-about .about-team-count {
  display: block;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin-bottom: 12px;
}

.page-about .about-team-card .card-title {
  margin: 0 0 8px;
  font-size: 17px;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-light-2);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

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

.page-about .about-figure .media-caption {
  margin-top: 10px;
}

/* ---------- 流程 ---------- */
.page-about .about-route {
  display: none;
}

.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-step {
  display: grid;
  gap: 8px;
  align-content: start;
  padding-top: 16px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-step-no {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .about-step .card-title {
  margin: 0;
  font-size: 16px;
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-light-2);
}

/* ---------- 版本 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 10px;
  margin-top: 30px;
}

.page-about .about-version {
  background: var(--c-paper);
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--c-stone);
}

.page-about .about-version[open] {
  border-left-color: var(--c-indigo);
}

.page-about .about-version summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-version summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-about .about-version-no {
  flex: none;
  min-width: 3em;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-version-name {
  font-size: 16px;
  color: var(--text-light-1);
}

.page-about .about-version-toggle {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
  margin-left: auto;
}

.page-about .about-version-toggle::before,
.page-about .about-version-toggle::after {
  content: "";
  position: absolute;
  background: var(--c-clay);
}

.page-about .about-version-toggle::before {
  left: 0;
  top: 5.5px;
  width: 12px;
  height: 1px;
}

.page-about .about-version-toggle::after {
  left: 5.5px;
  top: 0;
  width: 1px;
  height: 12px;
}

.page-about .about-version[open] .about-version-toggle::after {
  display: none;
}

.page-about .about-version-list {
  list-style: none;
  margin: 0;
  padding: 0 18px 20px 18px;
  display: grid;
  gap: 8px;
}

.page-about .about-version-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-light-2);
}

.page-about .about-version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 1px;
  background: var(--c-stone);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-partner-card {
  display: grid;
  gap: 10px;
  align-content: start;
  background: var(--c-indigo);
  color: var(--text-dark-1);
  padding: 26px 22px 28px;
  border-left: 3px solid var(--c-cyan);
}

.page-about .about-partner-num {
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-about .about-partner-card .card-title {
  margin: 0;
  font-size: 17px;
  color: var(--text-dark-1);
}

.page-about .about-partner-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dark-2);
}

/* ---------- 节奏 ---------- */
.page-about .about-rhythm {
  margin-top: 26px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-rhythm-item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-rhythm-item .card-title {
  margin: 0;
  font-size: 16px;
}

.page-about .about-rhythm-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-light-2);
}

.page-about .about-load {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 地域 ---------- */
.page-about .about-region {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .about-region .about-figure {
  margin: 0;
}

.page-about .about-region-text {
  min-width: 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--c-night);
  color: var(--text-dark-1);
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: -8%;
  top: -40%;
  width: 32%;
  height: 180%;
  background: var(--c-cyan);
  opacity: 0.06;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-cta .eyebrow {
  color: var(--c-cyan);
  margin: 0;
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  color: var(--text-dark-1);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dark-2);
}

.page-about .about-cta p a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-cta p a:hover {
  color: var(--c-orange);
}

.page-about .about-cta .btn {
  justify-self: start;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-route {
    display: block;
    width: 100%;
    height: 40px;
    margin: 30px 0 6px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    margin-top: 14px;
  }

  .page-about .about-rhythm-item {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 32px;
  }

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

@media (min-width: 880px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail-list {
    display: grid;
    gap: 24px;
    padding: 0 0 0 20px;
    border-top: 0;
    border-left: 1px solid var(--line-light);
    overflow: visible;
  }

  .page-about .about-rail-item::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 7px;
    width: 9px;
    height: 1px;
    background: var(--c-cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card {
    transition: none;
  }

  .page-about .about-team-card:hover {
    transform: none;
  }
}