.page-about {
  --about-shell: 1180px;
  --about-tl: 190px;
  --about-line: rgba(29, 111, 165, .18);
  color: var(--c-text);
  background:
    radial-gradient(120% 70% at 88% -8%, rgba(95, 211, 232, .20), transparent 62%),
    radial-gradient(90% 60% at 2% 4%, rgba(178, 108, 255, .13), transparent 58%),
    var(--c-snow);
  padding-bottom: clamp(2rem, 6vw, 4rem);
  overflow-x: hidden;
}

/* ---------- 通用排版 ---------- */
.page-about .about-section {
  padding: clamp(2.25rem, 6vw, 4.5rem) 0;
}

.page-about .about-head {
  max-width: 44rem;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-head__sub {
  margin-top: .6rem;
  color: var(--c-text-soft);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .eyebrow {
  margin-bottom: .7rem;
}

.page-about .eyebrow--light {
  color: var(--c-ice-300);
}

.page-about .about-frost {
  height: 1px;
  border: 0;
  margin: 0 auto;
  width: min(100% - 2 * var(--gutter), var(--about-shell));
  background-image: repeating-linear-gradient(90deg, rgba(29, 111, 165, .38) 0 16px, transparent 16px 30px);
}

.page-about p {
  line-height: 1.78;
}

.page-about .col-main p + p,
.page-about .col-main h2 + p,
.page-about .col-main p + h3 {
  margin-top: .9rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1rem, 3vw, 1.75rem) 0 clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-hero__body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.25rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.2;
  margin: 0;
}

.page-about .about-hero__lede {
  margin-top: 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  color: var(--c-text-soft);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  inset: auto -14px -14px auto;
  width: 46%;
  height: 46%;
  border-radius: 26px 6px 26px 6px;
  background: linear-gradient(140deg, rgba(178, 108, 255, .28), rgba(95, 211, 232, .05));
  z-index: 0;
}

.page-about .about-hero__figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  object-fit: cover;
}

.page-about .about-hero__figure .img-frame__caption {
  position: relative;
  z-index: 1;
  margin-top: .85rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--c-ice-600);
  letter-spacing: .02em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border-radius: 16px 4px 16px 4px;
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, .82);
}

.page-about .about-facts__num {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--c-ink-800);
  letter-spacing: -.01em;
}

.page-about .about-facts__label {
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
  line-height: 1.5;
}

/* ---------- 使命 ---------- */
.page-about .about-mission__grid {
  row-gap: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-note {
  padding: clamp(1.15rem, 3vw, 1.6rem);
}

.page-about .about-note__list {
  margin: .6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-about .about-note__list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: .75rem;
  align-items: start;
}

.page-about .about-note__key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-chip);
  background: linear-gradient(140deg, var(--c-ice-600), var(--c-violet-500));
  color: #fff;
  font-size: .8rem;
  font-weight: 700;
}

.page-about .about-note h3 {
  margin: 0 0 .2rem;
}

.page-about .about-note p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
  line-height: 1.65;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: .4rem;
  bottom: .4rem;
  left: .75rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(95, 211, 232, .95), rgba(178, 108, 255, .55) 55%, rgba(95, 211, 232, .12));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.4rem;
  margin-bottom: clamp(1.15rem, 3vw, 1.75rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: .75rem;
  top: .85rem;
  width: 11px;
  height: 11px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--c-ice-300);
  border: 1px solid rgba(6, 26, 46, .15);
  box-shadow: 0 0 0 4px rgba(95, 211, 232, .16);
}

.page-about .about-timeline__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .55rem;
  margin-bottom: .55rem;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-ice-600);
}

.page-about .about-timeline__panel {
  padding: clamp(1rem, 2.6vw, 1.4rem);
}

.page-about .about-timeline__panel h3 {
  margin: 0 0 .45rem;
}

.page-about .about-timeline__panel p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
}

.page-about .about-timeline__panel a {
  color: var(--c-ice-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-team__figure {
  margin: 0;
  text-align: center;
}

.page-about .about-donut {
  width: min(78%, 280px);
  height: auto;
  display: block;
  margin: 0 auto;
}

.page-about .about-team__figure .img-frame__caption {
  display: block;
  margin-top: .8rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--c-text-soft);
}

.page-about .about-tabs__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-tabs__labels {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}

.page-about .about-tabs__btn {
  display: inline-flex;
  align-items: center;
  padding: .55rem .95rem;
  border-radius: var(--radius-chip);
  border: 1px solid var(--c-line);
  background: rgba(255, 255, 255, .72);
  color: var(--c-text-soft);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-tabs__btn:hover {
  border-color: var(--c-ice-300);
  color: var(--c-ice-600);
}

.page-about #team-1:checked ~ .about-tabs__labels label[for="team-1"],
.page-about #team-2:checked ~ .about-tabs__labels label[for="team-2"],
.page-about #team-3:checked ~ .about-tabs__labels label[for="team-3"] {
  background: linear-gradient(135deg, var(--c-ink-800), var(--c-ice-600));
  border-color: transparent;
  color: var(--c-text-on-dark);
}

.page-about #team-1:focus-visible ~ .about-tabs__labels label[for="team-1"],
.page-about #team-2:focus-visible ~ .about-tabs__labels label[for="team-2"],
.page-about #team-3:focus-visible ~ .about-tabs__labels label[for="team-3"] {
  outline: 2px solid var(--c-violet-500);
  outline-offset: 2px;
}

.page-about .about-tabs__panel {
  display: none;
  padding: clamp(1.1rem, 2.8vw, 1.5rem);
  border-radius: var(--radius-panel);
  background: rgba(255, 255, 255, .86);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-panel);
}

.page-about .about-tabs__panel h3 {
  margin: 0 0 .5rem;
}

.page-about .about-tabs__panel p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
}

.page-about #team-1:checked ~ .about-tabs__panels #team-panel-1,
.page-about #team-2:checked ~ .about-tabs__panels #team-panel-2,
.page-about #team-3:checked ~ .about-tabs__panels #team-panel-3 {
  display: block;
}

.page-about .about-bullets {
  margin: .9rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .5rem;
}

.page-about .about-bullets li {
  position: relative;
  padding-left: 1.1rem;
  font-size: var(--fs-sm);
  color: var(--c-text);
  line-height: 1.6;
}

.page-about .about-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--c-ice-300);
}

/* ---------- 企业服务 ---------- */
.page-about .about-enterprise__grid {
  row-gap: clamp(1.5rem, 3vw, 2rem);
}

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

.page-about .about-enterprise__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-panel);
  object-fit: cover;
  box-shadow: var(--shadow-panel);
}

.page-about .about-enterprise__media .img-frame__caption {
  display: block;
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--c-ice-600);
}

.page-about .about-steps {
  display: grid;
  gap: .85rem;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-panel);
  background: rgba(255, 255, 255, .8);
  border: 1px solid var(--c-line);
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}

.page-about .about-steps__item:hover,
.page-about .about-steps__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--c-ice-300);
  box-shadow: 0 22px 46px -38px rgba(6, 26, 46, .95);
}

.page-about .about-steps__num {
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--c-violet-500);
  margin-bottom: .35rem;
}

.page-about .about-steps__item h3 {
  margin: 0 0 .35rem;
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  row-gap: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-eco__list {
  margin-top: 1.4rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-eco__item {
  border-top: 1px solid var(--c-line);
}

.page-about .about-eco__item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .95rem 0;
  cursor: pointer;
  font-weight: 600;
  color: var(--c-ink-800);
  list-style: none;
}

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

.page-about .about-eco__item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--c-ice-600);
  flex: none;
}

.page-about .about-eco__item[open] summary::after {
  content: "–";
}

.page-about .about-eco__item summary:hover {
  color: var(--c-ice-600);
}

.page-about .about-eco__item p {
  margin: 0 0 1rem;
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
  padding-left: .9rem;
  border-left: 2px solid rgba(95, 211, 232, .55);
}

.page-about .about-quote {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--c-text-on-dark);
}

.page-about .about-quote__text {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.7;
  margin: 0 0 .8rem;
  color: var(--c-text-on-dark);
}

.page-about .about-quote__note {
  margin: 0 0 1.2rem;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--c-text-on-dark-soft);
}

.page-about .about-quote__btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 结尾联系 ---------- */
.page-about .about-cta-section {
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-cta {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(178, 108, 255, .35), transparent 58%),
    radial-gradient(70% 100% at 0% 100%, rgba(15, 61, 58, .9), transparent 62%),
    linear-gradient(135deg, var(--c-ink-900), var(--c-ink-800));
  color: var(--c-text-on-dark);
  box-shadow: 0 40px 80px -60px rgba(6, 26, 46, 1);
}

.page-about .about-cta__title {
  color: var(--c-text-on-dark);
  margin: 0;
}

.page-about .about-cta__sub {
  margin: .9rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--c-text-on-dark-soft);
  max-width: 34rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.5rem;
}

.page-about .about-cta__contact {
  display: grid;
  gap: .5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--c-line-dark);
}

.page-about .about-cta__contact .contact-row {
  display: flex;
  flex-direction: column;
  gap: .15rem;
}

.page-about .about-cta__contact .contact-row__key {
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--c-ice-300);
}

.page-about .about-cta__contact .contact-row__val {
  font-size: var(--fs-sm);
  color: var(--c-text-on-dark);
  word-break: break-word;
}

.page-about .about-cta__contact .contact-row__val--mono {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta__contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .9rem 1.5rem;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 1.5rem;
  }

  .page-about .about-hero__figure::before {
    inset: auto -18px -18px auto;
  }

  .page-about .about-mission__grid {
    align-items: start;
  }

  .page-about .about-timeline::before {
    left: calc(var(--about-tl) + 1.5rem);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: var(--about-tl) minmax(0, 1fr);
    column-gap: 3rem;
    padding-left: 0;
  }

  .page-about .about-timeline__item::before {
    left: calc(var(--about-tl) + 1.5rem);
    top: 1.2rem;
  }

  .page-about .about-timeline__meta {
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    margin: 0;
    padding-top: .85rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }

  .page-about .about-cta__contact {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 0;
    padding-left: 1.6rem;
    border-top: 0;
    border-left: 1px solid var(--c-line-dark);
    align-content: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    letter-spacing: -.03em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps__item,
  .page-about .about-tabs__btn {
    transition: none;
  }
}