.page-about {
  background: var(--c-ink);
  color: var(--c-paper);
  --about-pad: clamp(56px, 8vw, 112px);
  --about-ink-soft: rgba(244, 240, 230, 0.68);
  --about-ink-line: rgba(244, 240, 230, 0.12);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 0;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(155, 92, 255, 0.30), transparent 60%),
    radial-gradient(90% 70% at 2% 88%, rgba(46, 211, 247, 0.16), transparent 62%),
    var(--c-ink);
}

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

.page-about .about-hero__eyebrow {
  color: var(--c-cyan);
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(40px, 10.5vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  max-width: 15ch;
}

.page-about .about-hero__title-em {
  display: block;
  margin-top: 0.14em;
  font-size: 0.46em;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: 0;
  background: linear-gradient(96deg, var(--c-violet), var(--c-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__meta {
  display: grid;
  gap: 22px;
  padding-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-hero__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__tags li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 0;
  border-top: 1px solid var(--about-ink-line);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-ink-soft);
}

.page-about .about-hero__tags b {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 20px;
  color: var(--c-paper);
  letter-spacing: -0.02em;
}

.page-about .about-hero__plate {
  margin: 0;
  height: clamp(190px, 44vw, 460px);
  overflow: hidden;
  border-top: 1px solid var(--about-ink-line);
  border-bottom: 1px solid var(--about-ink-line);
}

.page-about .about-hero__plate img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}

.page-about .about-hero__ridge {
  display: block;
  width: 100%;
  height: 72px;
  margin-top: -1px;
}

/* ---------- 通用分区 ---------- */

.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-section--ink {
  background: var(--c-ink);
  color: var(--c-paper);
}

.page-about .about-section--paper {
  background: var(--c-paper);
  color: var(--c-ink);
  --about-ink-soft: rgba(14, 12, 20, 0.66);
  --about-ink-line: rgba(14, 12, 20, 0.16);
}

.page-about .about-section--paper::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  width: 96px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-violet), var(--c-cyan));
}

.page-about .about-head {
  margin-bottom: clamp(32px, 5vw, 60px);
}

.page-about .about-head__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
}

.page-about .about-section--paper .about-head__no {
  color: var(--c-clay);
}

.page-about .about-head__eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-ink-soft);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-head__note {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 三个坎 ---------- */

.page-about .about-pains {
  display: grid;
  gap: 20px;
}

.page-about .about-pain {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--c-graphite);
  border: 1px solid var(--about-ink-line);
  border-left: 3px solid var(--c-violet);
}

.page-about .about-pain:nth-child(2) {
  border-left-color: var(--c-cyan);
}

.page-about .about-pain:nth-child(3) {
  border-left-color: var(--c-orange);
}

.page-about .about-pain__no {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-haze);
}

.page-about .about-pain__title {
  margin: 0 0 12px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(19px, 2vw, 22px);
  line-height: 1.35;
  color: var(--c-paper);
}

.page-about .about-pain__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-pain__fix {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-ink-line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-paper);
}

.page-about .about-pain__fix::before {
  content: "→ ";
  color: var(--c-cyan);
}

/* ---------- 时间轴 ---------- */

.page-about .about-tl {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-tl__link {
  display: grid;
  grid-template-columns: 40px 1fr;
  align-items: center;
  gap: 4px 14px;
  padding: 12px 14px;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--about-ink-line);
  background: rgba(255, 255, 255, 0.35);
  transition: border-color 160ms linear, transform 160ms var(--ease);
}

.page-about .about-tl__link:hover,
.page-about .about-tl__link:focus-visible {
  border-color: var(--c-violet);
  transform: translateX(4px);
}

.page-about .about-tl__no {
  grid-row: 1 / span 2;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--c-clay);
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-clay);
}

.page-about .about-tl__word {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.01em;
}

.page-about .about-tl__hint {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-ink-soft);
}

.page-about .about-stages {
  display: grid;
  gap: 0;
}

.page-about .about-stage {
  padding: 22px 0;
  border-top: 1px solid var(--about-ink-line);
  scroll-margin-top: 90px;
}

.page-about .about-stage:last-child {
  border-bottom: 1px solid var(--about-ink-line);
}

.page-about .about-stage__no {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-clay);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-stage__body {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-stage__body a {
  color: var(--c-violet);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 92, 255, 0.5);
}

.page-about .about-stage__body a:hover,
.page-about .about-stage__body a:focus-visible {
  border-bottom-color: var(--c-violet);
}

.page-about .about-figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--about-ink-line);
}

.page-about .about-figure__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-ink-soft);
  max-width: 54ch;
}

/* ---------- 能力清单 ---------- */

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

.page-about .about-cap {
  position: relative;
  padding: 24px 20px 26px;
  background: linear-gradient(180deg, rgba(42, 39, 51, 0.9), rgba(14, 12, 20, 0.9));
  border: 1px solid var(--about-ink-line);
  border-top: 2px solid var(--c-violet);
  transition: border-color 160ms linear;
}

.page-about .about-cap--b {
  border-top-color: var(--c-cyan);
}

.page-about .about-cap--c {
  border-top-color: var(--c-orange);
}

.page-about .about-cap--d {
  border-top-color: var(--c-moss);
}

.page-about .about-cap:hover {
  border-color: var(--c-violet);
  border-top-color: var(--c-violet);
}

.page-about .about-cap__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-haze);
}

.page-about .about-cap__title {
  margin: 0 0 14px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-about .about-cap__big {
  margin: 0 0 18px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--about-ink-line);
}

.page-about .about-cap__num {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(38px, 6vw, 54px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-paper);
}

.page-about .about-cap__unit {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .about-cap__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-cap__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-cap__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--c-cyan);
}

.page-about .about-cap__list b {
  font-family: var(--f-display);
  font-weight: 800;
  color: var(--c-paper);
}

/* ---------- 团队 ---------- */

.page-about .about-team__lede {
  margin: 0 0 24px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-team__facts {
  margin: 0 0 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-ink-line);
  border: 1px solid var(--about-ink-line);
}

.page-about .about-team__fact {
  padding: 14px 14px 16px;
  background: var(--c-ink);
}

.page-about .about-team__fact dt {
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-haze);
}

.page-about .about-team__fact dd {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-team__note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--c-clay);
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-team__fig {
  margin: 32px 0 0;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-ink-line);
}

.page-about .about-team__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 标准 ---------- */

.page-about .about-std {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: none;
}

.page-about .about-std__row {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--about-ink-line);
}

.page-about .about-std__row:last-child {
  border-bottom: 1px solid var(--about-ink-line);
}

.page-about .about-std__no {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .about-std__t {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
}

.page-about .about-std__d {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-std__d a {
  color: var(--c-violet);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 92, 255, 0.5);
}

.page-about .about-std__d a:hover,
.page-about .about-std__d a:focus-visible {
  border-bottom-color: var(--c-violet);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partners__grid {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(30px, 4vw, 50px);
}

.page-about .about-partners__card {
  padding: 22px 20px 24px;
  border: 1px solid var(--about-ink-line);
  background: rgba(42, 39, 51, 0.7);
  border-left: 3px solid var(--c-moss);
}

.page-about .about-partners__card--clay {
  border-left-color: var(--c-clay);
}

.page-about .about-partners__card--violet {
  border-left-color: var(--c-violet);
}

.page-about .about-partners__num {
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(34px, 5vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-paper);
}

.page-about .about-partners__num span {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .about-partners__label {
  margin: 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border: 1px solid var(--about-ink-line);
  background:
    linear-gradient(120deg, rgba(155, 92, 255, 0.18), rgba(46, 211, 247, 0.10) 62%, transparent),
    var(--c-graphite);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__meta {
    grid-template-columns: minmax(0, 1.5fr) minmax(220px, 1fr);
    align-items: start;
    gap: 40px;
  }

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

  .page-about .about-pain:nth-child(2) {
    transform: translateY(28px);
  }

  .page-about .about-pain:nth-child(3) {
    transform: translateY(56px);
  }

  .page-about .about-stage {
    display: grid;
    grid-template-columns: 156px minmax(0, 1fr);
    gap: 6px 32px;
    padding: 26px 0;
  }

  .page-about .about-stage__no {
    grid-row: 1 / span 2;
    margin: 4px 0 0;
  }

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

  .page-about .about-std__row {
    grid-template-columns: 48px 200px minmax(0, 1fr);
    gap: 6px 24px;
    align-items: start;
    padding: 26px 0;
  }

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

  .page-about .about-partners__card:nth-child(2) {
    transform: translateY(26px);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
    gap: 32px;
    padding: 30px 28px;
  }
}

@media (min-width: 880px) {
  .page-about .about-tl {
    position: relative;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--about-ink-line);
    padding-top: 26px;
  }

  .page-about .about-tl__link {
    display: block;
    padding: 0 14px 0 0;
    border: 0;
    background: none;
    transform: none;
  }

  .page-about .about-tl__link:hover,
  .page-about .about-tl__link:focus-visible {
    transform: translateX(4px);
  }

  .page-about .about-tl__no {
    display: grid;
    width: 44px;
    height: 44px;
    margin-bottom: 14px;
    background: var(--c-paper);
    transition: color 160ms linear, border-color 160ms linear;
  }

  .page-about .about-tl__link:hover .about-tl__no,
  .page-about .about-tl__link:focus-visible .about-tl__no {
    border-color: var(--c-violet);
    color: var(--c-violet);
  }

  .page-about .about-tl__word {
    display: block;
    margin-bottom: 8px;
  }

  .page-about .about-tl__hint {
    display: block;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: opacity 160ms linear, max-height 220ms var(--ease);
  }

  .page-about .about-tl__link:hover .about-tl__hint,
  .page-about .about-tl__link:focus-visible .about-tl__hint {
    opacity: 1;
    max-height: 90px;
  }

  .page-about .about-caps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
  }

  .page-about .about-cap--b {
    margin-top: 30px;
  }

  .page-about .about-cap--d {
    margin-top: 30px;
  }

  .page-about .about-team {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-team__fig {
    margin: 12px 0 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

  .page-about .about-hero__title-em {
    font-size: 0.42em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__link,
  .page-about .about-tl__no,
  .page-about .about-tl__hint {
    transition: color 160ms linear, border-color 160ms linear;
  }

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