.page-about {
  --about-pad: clamp(64px, 9vw, 132px);
  --about-radius: 24px 8px 24px 8px;
  --about-soft: #FBF7EE;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(0, 224, 184, 0.16) 0%, transparent 58%),
    radial-gradient(90% 80% at 4% 92%, rgba(242, 181, 68, 0.14) 0%, transparent 60%),
    var(--deep);
  color: var(--porcelain);
  padding: clamp(104px, 13vw, 176px) 0 clamp(48px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -24% -12%;
  background-image:
    repeating-linear-gradient(90deg, rgba(0, 224, 184, 0.13) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(0, 224, 184, 0.13) 0 1px, transparent 1px 72px);
  transform: rotate(-6deg);
  -webkit-mask-image: radial-gradient(70% 70% at 60% 40%, #000 0%, transparent 78%);
  mask-image: radial-gradient(70% 70% at 60% 40%, #000 0%, transparent 78%);
  pointer-events: none;
}

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

.page-about .about-crumb {
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  margin-bottom: clamp(28px, 4vw, 48px);
}

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

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--coral);
}

.page-about .about-crumb-sep {
  margin: 0 8px;
  color: rgba(201, 211, 208, 0.6);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-hero-copy .eyebrow {
  color: var(--gold);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 68px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 22px;
  max-width: 16em;
}

.page-about .about-hero .lede {
  color: rgba(247, 243, 234, 0.86);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  max-width: 40em;
}

.page-about .about-hero-balls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.page-about .about-ball {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--deep);
  transform: rotate(-6deg);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.28);
}

.page-about .about-ball--gold { background: var(--gold); }
.page-about .about-ball--mint { background: var(--mint); }
.page-about .about-ball--coral { background: var(--coral); color: var(--ink); }
.page-about .about-ball--ghost {
  background: transparent;
  border: 1px solid rgba(247, 243, 234, 0.45);
  color: var(--porcelain);
  box-shadow: none;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(36px, 5vw, 56px) 0 0;
  padding: 0;
  background: rgba(247, 243, 234, 0.16);
  border: 1px solid rgba(247, 243, 234, 0.16);
  border-radius: 14px 4px 14px 4px;
  overflow: hidden;
}

.page-about .about-hero-stat {
  background: rgba(6, 59, 68, 0.86);
  padding: 18px 20px;
}

.page-about .about-hero-stat dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-hero-stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--porcelain);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  background: var(--porcelain);
  color: var(--ink);
  padding: var(--about-pad) 0;
}

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.page-about .about-origin-copy .eyebrow,
.page-about .about-sec-head--ink .eyebrow {
  color: var(--coral-dark);
}

.page-about .about-origin h2,
.page-about .about-sec-head h2,
.page-about .about-outro h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 14px 0 20px;
  color: var(--deep);
}

.page-about .about-origin-copy p {
  font-size: 17px;
  line-height: 1.8;
  color: #24313a;
  max-width: 34em;
}

.page-about .about-origin-copy p + p {
  margin-top: 16px;
}

.page-about .about-origin-copy .note {
  margin-top: 22px;
  padding: 14px 18px;
  border-left: 3px solid var(--gold);
  background: var(--about-soft);
  border-radius: 0 12px 12px 0;
  font-size: 15px;
  color: #2f3d46;
}

.page-about .about-origin-figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--teal);
  box-shadow: 0 24px 48px rgba(6, 59, 68, 0.16);
}

.page-about .about-origin-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-origin-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--porcelain);
  background: var(--deep);
  padding: 12px 18px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--deep);
  color: var(--porcelain);
  padding: var(--about-pad) 0;
}

.page-about .about-sec-head {
  max-width: 46em;
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.page-about .about-team .about-sec-head .eyebrow {
  color: var(--mint);
}

.page-about .about-team .about-sec-head h2 {
  color: var(--porcelain);
}

.page-about .about-sec-head p {
  font-size: 17px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.78);
  margin: 0;
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  align-items: center;
}

.page-about .about-team-ring {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    from -90deg,
    var(--coral) 0 37.5%,
    var(--gold) 37.5% 62.5%,
    var(--mint) 62.5% 81.25%,
    rgba(247, 243, 234, 0.26) 81.25% 100%
  );
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.32);
}

.page-about .about-team-ring::after {
  content: "";
  position: absolute;
  inset: 19%;
  border-radius: 50%;
  background: var(--deep);
}

.page-about .about-team-ring-center {
  position: relative;
  z-index: 1;
  text-align: center;
  line-height: 1.1;
}

.page-about .about-ring-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 54px);
  font-weight: 800;
  color: var(--gold);
  letter-spacing: -0.03em;
}

.page-about .about-ring-unit {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin-top: 6px;
}

.page-about .about-team-roles {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-role {
  border-top: 1px solid var(--line-light);
  padding: 4px 0;
}

.page-about .about-role summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.3vw, 24px);
  font-weight: 700;
  color: var(--porcelain);
}

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

.page-about .about-role summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.page-about .about-role-num {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .about-role-name {
  flex: 1 1 auto;
}

.page-about .about-role-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .about-role-dot--coral { background: var(--coral); }
.page-about .about-role-dot--gold { background: var(--gold); }
.page-about .about-role-dot--mint { background: var(--mint); }
.page-about .about-role-dot--mist { background: var(--mist); }

.page-about .about-role p {
  margin: 0 0 18px;
  padding-left: 32px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 243, 234, 0.8);
  max-width: 36em;
}

.page-about .about-team-figure {
  margin: clamp(40px, 5vw, 64px) 0 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--teal);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
  padding: 12px 18px;
  background: rgba(14, 110, 117, 0.72);
}

/* ---------- 校对 ---------- */
.page-about .about-process {
  background: var(--porcelain);
  color: var(--ink);
  padding: var(--about-pad) 0;
}

.page-about .about-sec-head--ink p {
  color: #3a4a53;
}

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

.page-about .about-step {
  position: relative;
  background: var(--salt);
  border: 1px solid var(--line-dark);
  border-radius: var(--about-radius);
  padding: 26px 24px 24px;
  overflow: hidden;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 4px;
  background: var(--coral);
}

.page-about .about-step-idx {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--teal);
  margin-bottom: 10px;
}

.page-about .about-step h3 {
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 700;
  color: var(--deep);
  margin: 0 0 10px;
}

.page-about .about-step p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: #33434c;
}

.page-about .about-step-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--deep);
  background: rgba(0, 224, 184, 0.16);
  border: 1px solid rgba(14, 110, 117, 0.28);
}

.page-about .about-process-foot {
  margin-top: clamp(32px, 4vw, 48px);
  padding: 24px 26px;
  background: var(--about-soft);
  border-radius: 16px 4px 16px 4px;
  border-left: 3px solid var(--gold);
}

.page-about .about-process-foot p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #2b3a43;
}

.page-about .about-process-foot p + p {
  margin-top: 10px;
}

.page-about .about-process-foot strong {
  color: var(--coral-dark);
}

/* ---------- 版本年表 ---------- */
.page-about .about-timeline {
  background: var(--about-soft);
  color: var(--ink);
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-timeline-banner {
  margin: 0 0 clamp(36px, 5vw, 60px);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--deep);
}

.page-about .about-timeline-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-timeline-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--coral) 0%, var(--gold) 52%, var(--mint) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding-bottom: clamp(26px, 3vw, 38px);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  border: 3px solid var(--about-soft);
  box-shadow: 0 0 0 1px rgba(11, 15, 18, 0.16);
}

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

.page-about .about-timeline-year {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin-bottom: 6px;
}

.page-about .about-timeline-item h3 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  color: var(--deep);
  margin: 0 0 8px;
}

.page-about .about-timeline-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: #3a4a53;
  max-width: 40em;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  background: var(--teal);
  color: var(--porcelain);
  padding: var(--about-pad) 0;
}

.page-about .about-partners .about-sec-head .eyebrow {
  color: var(--gold);
}

.page-about .about-partners .about-sec-head h2 {
  color: var(--porcelain);
}

.page-about .about-partners .about-sec-head p {
  color: rgba(247, 243, 234, 0.84);
}

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

.page-about .about-partner-card {
  background: rgba(6, 59, 68, 0.52);
  border: 1px solid rgba(247, 243, 234, 0.18);
  border-radius: var(--about-radius);
  padding: 26px 24px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-partner-card:hover {
  border-color: var(--gold);
  background: rgba(6, 59, 68, 0.72);
}

.page-about .about-partner-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.page-about .about-partner-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--porcelain);
  margin: 0 0 10px;
}

.page-about .about-partner-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: rgba(247, 243, 234, 0.82);
}

.page-about .about-partner-foot {
  margin-top: clamp(30px, 4vw, 44px);
  display: grid;
  gap: 20px;
  align-items: start;
  padding-top: 26px;
  border-top: 1px solid rgba(247, 243, 234, 0.22);
}

.page-about .about-partner-foot p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.86);
  max-width: 46em;
}

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

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  background: var(--porcelain);
  color: var(--ink);
  padding: var(--about-pad) 0 calc(var(--about-pad) * 0.85);
}

.page-about .about-outro-inner {
  border-top: 1px solid var(--line-dark);
  padding-top: clamp(32px, 4vw, 48px);
}

.page-about .about-outro h2 {
  margin-top: 0;
}

.page-about .about-outro-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-outro-list a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "key title"
    "key desc";
  column-gap: 16px;
  row-gap: 4px;
  padding: 20px 22px;
  border: 1px solid var(--line-dark);
  border-radius: 16px 4px 16px 4px;
  background: var(--salt);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-outro-list a:hover,
.page-about .about-outro-list a:focus-visible {
  border-color: var(--coral);
  background: var(--about-soft);
}

.page-about .about-outro-k {
  grid-area: key;
  align-self: center;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--deep);
  color: var(--gold);
  font-size: 14px;
}

.page-about .about-outro-t {
  grid-area: title;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .about-outro-d {
  grid-area: desc;
  font-size: 15px;
  line-height: 1.7;
  color: #3d4d56;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-outro-list a {
    grid-template-columns: 1fr;
    grid-template-areas:
      "key"
      "title"
      "desc";
    row-gap: 10px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
    align-items: center;
  }

  .page-about .about-hero-balls {
    justify-content: flex-end;
    gap: 18px;
    padding-right: 8px;
  }

  .page-about .about-ball {
    width: 82px;
    height: 82px;
    font-size: 20px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .about-origin-figure {
    transform: translateY(-16px) rotate(-1.2deg);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1fr);
  }

  .page-about .about-team-ring {
    width: min(100%, 340px);
  }

  .page-about .about-timeline-list {
    padding-left: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-timeline-list::before {
    left: 50%;
    top: 14px;
    bottom: 14px;
    transform: translateX(-1px);
  }

  .page-about .about-timeline-item {
    padding-bottom: clamp(32px, 4vw, 52px);
    padding-right: 48px;
  }

  .page-about .about-timeline-item::before {
    left: auto;
    right: -7px;
    top: 10px;
  }

  .page-about .about-timeline-item:nth-child(even) {
    grid-column: 2;
    padding-right: 0;
    padding-left: 48px;
    padding-top: clamp(28px, 4vw, 48px);
  }

  .page-about .about-timeline-item:nth-child(even)::before {
    right: auto;
    left: -7px;
  }

  .page-about .about-partner-foot {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-partner-foot .btn {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-partner-card,
  .page-about .about-outro-list a {
    transition: none;
  }

  .page-about .about-origin-figure {
    transform: none;
  }
}