.page-about {
  --about-pad: clamp(20px, 4vw, 34px);
  --about-radius: 2px;
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about [tabindex]:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 3px;
}

/* ---------- 通用排版 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 8px 0 14px;
}

.page-about .about-lede {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 28px;
}

.page-about .about-p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 16px;
}

.page-about .about-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  border-left: 3px solid var(--mist);
  padding-left: 14px;
  margin: 20px 0 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lake);
}

.page-about .about-section {
  padding-block: clamp(44px, 7vw, 92px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--mist {
  background: linear-gradient(180deg, rgba(207, 231, 227, 0.55), rgba(207, 231, 227, 0.2));
}

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

.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head .about-h2 {
  margin-top: 6px;
}

.page-about .about-section .figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-figure .figure__frame {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  position: relative;
  padding-block: clamp(26px, 4vw, 52px) clamp(34px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(28, 154, 139, 0.16), transparent 62%),
    radial-gradient(90% 80% at 0% 100%, rgba(91, 75, 196, 0.1), transparent 58%),
    var(--paper);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--lake), var(--teal) 46%, var(--violet) 82%, var(--coral));
}

.page-about .about-cover__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  position: relative;
}

.page-about .about-cover__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 62px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 10px 0 18px;
}

.page-about .about-cover__lede {
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0 0 26px;
}

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

.page-about .about-cover__index {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-paper);
  padding: 20px 22px 22px;
  position: relative;
}

.page-about .about-cover__index::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--teal);
}

.page-about .about-cover__index-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--teal-deep);
  margin: 0 0 14px;
}

.page-about .about-cover__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-cover__index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 2px;
  border-bottom: 1px dashed var(--line);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: color 0.18s ease;
}

.page-about .about-cover__index-list li:last-child a {
  border-bottom: 0;
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet);
  letter-spacing: 0.06em;
  flex: 0 0 auto;
}

.page-about .about-cover__index-list a:hover {
  color: var(--lake);
}

/* ---------- 品牌由来 ---------- */
.page-about .about-origin__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
}

.page-about .about-origin__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-origin__figure {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(36px, 8vw, 64px);
  line-height: 1;
  color: var(--lake);
  letter-spacing: -0.02em;
}

.page-about .about-origin__rail-line {
  flex: 1 1 auto;
  height: 1px;
  background: var(--line);
}

.page-about .about-origin__rail-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0 0;
}

.page-about .about-stats__item {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 4px solid var(--teal);
  padding: 14px 16px;
}

.page-about .about-stats dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.page-about .about-stats dd {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  color: var(--lake-deep);
  margin-right: 4px;
}

/* ---------- 团队 ---------- */
.page-about .about-orbit {
  position: relative;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 22px 0;
}

.page-about .about-orbit__lines {
  display: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .about-orbit__a {
  fill: none;
  stroke: var(--mist);
  stroke-width: 0.6;
}

.page-about .about-orbit__b {
  fill: none;
  stroke: var(--line);
  stroke-width: 0.6;
  stroke-dasharray: 2 2;
}

.page-about .about-orbit__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-orbit__node {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 12px 10px;
  text-align: center;
  display: grid;
  gap: 6px;
  justify-items: center;
}

.page-about .about-orbit__node-text {
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.4;
}

.page-about .about-orbit__hub {
  grid-column: 1 / -1;
  margin-top: 6px;
  background: var(--ink);
  color: var(--paper-raised);
  font-size: 13.5px;
  line-height: 1.6;
  padding: 12px 16px;
  text-align: center;
  border-radius: var(--about-radius);
}

.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-paper);
  padding: 4px 18px 4px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-team:hover {
  transform: translateY(-3px);
  border-color: var(--lake);
  box-shadow: var(--shadow-lift);
}

.page-about .about-team summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
}

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

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--violet);
  flex: 0 0 auto;
}

.page-about .about-team__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink);
  flex: 1 1 auto;
}

.page-about .about-team__plus {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-about .about-team__plus::before,
.page-about .about-team__plus::after {
  content: "";
  position: absolute;
  background: var(--coral);
  transition: transform 0.2s ease;
}

.page-about .about-team__plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .about-team__plus::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .about-team[open] .about-team__plus::after {
  transform: scaleY(0);
}

.page-about .about-team__body {
  padding: 0 0 16px;
  border-top: 1px dashed var(--line);
}

.page-about .about-team__body p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
  margin: 14px 0 0;
}

.page-about .about-team__meta {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-team__meta span {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--teal-deep);
  border: 1px solid var(--mist);
  padding: 1px 6px;
  margin-right: 8px;
}

/* ---------- 内容路径 ---------- */
.page-about .about-process__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-path {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-path::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal), var(--lake) 55%, var(--violet));
  opacity: 0.5;
}

.page-about .about-path__item {
  position: relative;
  padding: 0 0 24px 48px;
  transition: transform 0.2s ease;
}

.page-about .about-path__item:last-child {
  padding-bottom: 0;
}

.page-about .about-path__dot {
  position: absolute;
  left: 4px;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 2px solid var(--teal);
  color: var(--teal-deep);
  font-family: var(--font-mono);
  font-size: 10px;
  display: grid;
  place-items: center;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-path__item:hover .about-path__dot,
.page-about .about-path__item:focus-visible .about-path__dot {
  background: var(--teal);
  border-color: var(--teal-deep);
  color: var(--paper-raised);
}

.page-about .about-path__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .about-path__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-process__side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-figure--side {
  margin-bottom: 0;
}

.page-about .about-side-card {
  background: var(--mist);
  border: 1px solid var(--line);
  padding: 18px 20px;
}

.page-about .about-side-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .about-side-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-side-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-side-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--coral);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 42px;
}

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

.page-about .about-timeline__marker {
  position: absolute;
  left: 2px;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--lake);
  background: var(--paper-raised);
  color: var(--lake);
  font-family: var(--font-mono);
  font-size: 9px;
  display: grid;
  place-items: center;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__marker {
  background: var(--lake);
  color: var(--paper-raised);
}

.page-about .about-timeline__year {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--coral-deep);
  margin: 0 0 2px;
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .about-timeline__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-milestones__side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-figure--tall {
  margin-bottom: 0;
}

.page-about .about-quote {
  border-left: 4px solid var(--coral);
  padding: 4px 0 4px 18px;
}

.page-about .about-quote__text {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .about-quote__sign {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  align-items: stretch;
}

.page-about .about-partner {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-paper);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-partner:hover {
  transform: translateY(-3px);
  border-color: var(--teal);
  box-shadow: var(--shadow-lift);
}

.page-about .about-partner .card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal-deep);
  margin: 0 0 10px;
}

.page-about .about-partner .card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .about-partner .card__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 16px;
  flex: 1 1 auto;
}

.page-about .about-partner .card__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--lake);
  border-top: 1px dashed var(--line);
  padding-top: 12px;
  margin: 0;
}

.page-about .about-partners__foot {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 74ch;
  margin: 26px 0 0;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-service {
  background:
    radial-gradient(80% 70% at 100% 0%, rgba(30, 111, 140, 0.55), transparent 62%),
    var(--ink-deep);
  color: var(--on-ink);
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .about-service__inner {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
}

.page-about .about-service__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  margin: 0;
}

.page-about .about-service__title {
  color: var(--paper-raised);
  margin: 8px 0 12px;
}

.page-about .about-service__lede {
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.8;
  color: var(--on-ink);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-service__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-service__item {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid rgba(207, 231, 227, 0.28);
  background: rgba(253, 251, 246, 0.05);
  text-decoration: none;
  color: var(--paper-raised);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-service__item:hover {
  background: rgba(253, 251, 246, 0.11);
  border-color: var(--teal);
  transform: translateY(-2px);
}

.page-about .about-service__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-service__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .about-service__text {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--on-ink-dim);
}

.page-about .about-service__contact {
  border-top: 1px solid rgba(207, 231, 227, 0.24);
  padding-top: 22px;
  display: grid;
  gap: 10px;
  justify-items: start;
}

.page-about .about-service__contact-title {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--paper-raised);
  margin: 0;
  word-break: break-word;
}

.page-about .about-service__contact-note {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--on-ink);
  margin: 0;
  max-width: 64ch;
}

.page-about .about-service__back {
  font-size: 14px;
  margin: 4px 0 0;
}

.page-about .about-service__back a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-service__back a:hover {
  color: var(--paper-raised);
}

/* ---------- 页尾补白 ---------- */
.page-about .about-tail {
  display: flex;
  justify-content: flex-end;
  padding-block: 20px 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .about-cover__inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 26px;
    align-items: end;
  }

  .page-about .about-cover__lead {
    grid-column: 1 / span 7;
  }

  .page-about .about-cover__index {
    grid-column: 9 / span 4;
  }

  .page-about .about-origin__inner {
    grid-template-columns: 140px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-origin__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 6px;
  }

  .page-about .about-origin__rail-line {
    flex: 0 0 auto;
    width: 1px;
    height: 90px;
    background: var(--line);
  }

  .page-about .about-orbit__lines {
    display: block;
  }

  .page-about .about-orbit {
    padding: 34px 0;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-teams > .about-team:nth-child(even) {
    margin-top: 26px;
  }

  .page-about .about-process__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-milestones__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cover__inner {
    column-gap: 34px;
  }

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

  .page-about .about-service__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-service__head {
    grid-column: 1;
  }

  .page-about .about-service__grid {
    grid-column: 2;
  }

  .page-about .about-service__contact,
  .page-about .about-service__back {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-partner,
  .page-about .about-service__item,
  .page-about .about-path__item {
    transition: none;
  }

  .page-about .about-team:hover,
  .page-about .about-partner:hover,
  .page-about .about-service__item:hover {
    transform: none;
  }
}