.page-about {
  --about-hero-line: linear-gradient(135deg, var(--blue) 0%, var(--orange) 100%);
}

.page-about .container {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ===== Hero 框景区 ===== */
.page-about .about-hero {
  padding: 2rem 0 3.5rem;
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  display: block;
  height: 4px;
  background: var(--about-hero-line);
  transform: skewX(-12deg);
  margin-bottom: 1.5rem;
  max-width: 420px;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 2rem;
}

.page-about .about-hero-copy .stamp-label {
  display: inline-block;
  margin-bottom: 1rem;
}

.page-about .about-hero-copy .display-title {
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: 0.01em;
  position: relative;
  padding-left: 1rem;
  margin: 0 0 1.25rem;
  color: var(--text);
}

.page-about .about-hero-copy .display-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 4px;
  background: var(--about-hero-line);
  transform: skewX(-12deg);
}

.page-about .about-hero-desc {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 62ch;
  margin: 0 0 1.5rem;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-aside {
  border: 1px dashed var(--paper-dim);
  background: var(--panel);
  padding: 1.5rem 1.25rem;
  position: relative;
}

.page-about .about-hero-aside .index-label {
  display: block;
  margin-bottom: 1rem;
}

.page-about .about-nav-list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.page-about .about-nav-list a {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.45rem 0.65rem;
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-nav-list a:hover,
.page-about .about-nav-list a:focus-visible {
  border-left-color: var(--blue);
  color: var(--blue);
  background: rgba(0, 194, 255, 0.08);
}

.page-about .about-hero-note {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  line-height: 1.5;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

/* ===== 品牌简介 ===== */
.page-about .about-profile {
  padding: 2.5rem 0;
}

.page-about .about-bento {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .about-profile-intro {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2rem 1.5rem;
  overflow: hidden;
}

.page-about .about-profile-copy .index-label,
.page-about .about-profile-stats .index-label {
  display: inline-block;
  margin-bottom: 1rem;
}

.page-about .about-profile-copy .section-title {
  font-size: 1.75rem;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--ink);
}

.page-about .about-profile-copy p {
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 0.75rem;
}

.page-about .about-profile-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-logo-figure {
  margin: 0;
  flex-shrink: 0;
  align-self: flex-start;
}

.page-about .about-logo-figure img {
  display: block;
  width: 100%;
  max-width: 180px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 2px solid var(--ink);
  padding: 0.35rem;
  background: var(--paper);
}

.page-about .about-profile-stats {
  padding: 1.5rem 1.25rem;
}

.page-about .about-data-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-data-item {
  border-bottom: 1px solid var(--line);
  padding-bottom: 1rem;
}

.page-about .about-data-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-data-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.page-about .about-data-number {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--green);
  line-height: 1.2;
  margin: 0;
}

.page-about .about-data-sub {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0.25rem 0 0;
}

/* ===== 发展历程 ===== */
.page-about .about-milestones {
  padding: 2.5rem 0;
  background: var(--bg);
}

.page-about .about-milestones .section-desc {
  color: var(--muted);
}

.page-about .about-timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--blue);
  position: relative;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 1.75rem;
  padding-bottom: 0.25rem;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 1.1rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--blue);
  box-sizing: border-box;
}

.page-about .about-timeline-details {
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline-details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0;
  transition: background-color 0.2s ease;
}

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

.page-about .about-timeline-details summary:hover {
  background: rgba(0, 194, 255, 0.05);
}

.page-about .about-timeline-details summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--orange);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.page-about .about-event {
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: 0.01em;
}

.page-about .about-timeline-details[open] .about-event {
  color: var(--blue);
}

.page-about .about-timeline-body {
  margin: 0;
  padding: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  max-width: 56ch;
}

.page-about .about-timeline-aside {
  display: flex;
}

.page-about .about-timeline-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.5rem 1.25rem;
  width: 100%;
  align-self: flex-start;
  transform: rotate(-1deg);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-timeline-card:hover {
  transform: rotate(0deg);
  border-color: var(--blue);
}

.page-about .about-timeline-card .index-label {
  display: inline-block;
  margin-bottom: 1.25rem;
}

.page-about .about-scale-list {
  display: grid;
  gap: 1rem;
}

.page-about .about-scale-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.6rem;
}

.page-about .about-scale-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.45rem;
  color: var(--green);
  line-height: 1.1;
}

.page-about .about-scale-label {
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

.page-about .about-scale-link {
  display: inline-block;
  margin-top: 1.25rem;
  color: var(--blue);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-scale-link:hover,
.page-about .about-scale-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ===== 专家团队 ===== */
.page-about .about-team {
  padding: 2.5rem 0;
}

.page-about .about-team .section-title,
.page-about .about-team .section-desc {
  color: var(--ink);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
  align-items: center;
}

.page-about .about-team-copy p {
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 1.25rem;
}

.page-about .about-team-copy .btn {
  margin-top: 0.5rem;
}

.page-about .about-team-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-team-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4em;
  width: 10px;
  height: 10px;
  background: var(--orange);
  transform: skewX(-20deg);
}

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

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--ink);
  padding: 0.3rem;
  background: var(--paper-dim);
}

.page-about .about-team-figure figcaption {
  margin-top: 0.75rem;
  color: var(--ink);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  text-align: right;
}

/* ===== 资质与认可 ===== */
.page-about .about-credentials {
  padding: 2.5rem 0;
}

.page-about .about-credentials .section-desc {
  color: var(--muted);
}

.page-about .about-cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.page-about .about-cred-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.75rem 1.5rem;
  position: relative;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-cred-card:hover {
  border-color: var(--blue);
  transform: translateY(-4px);
}

.page-about .about-cred-card h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  margin: 0 0 0.75rem;
  color: var(--text);
  letter-spacing: 0.01em;
}

.page-about .about-cred-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0;
}

.page-about .about-cred-card--iso {
  border-top: 3px solid var(--blue);
}

.page-about .about-cred-mark {
  margin: 0 0 1.25rem;
}

.page-about .about-cred-mark img {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-cred-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--bg);
  background: var(--green);
  padding: 0.2rem 0.5rem;
  margin-bottom: 1rem;
}

.page-about .about-cred-code--award {
  background: var(--orange);
}

.page-about .about-cred-icp {
  margin-top: 0.6rem !important;
  font-family: var(--font-mono);
  color: var(--text) !important;
}

/* ===== 信任收尾 ===== */
.page-about .about-trust {
  padding: 2.5rem 0 4rem;
}

.page-about .about-trust-inner {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 2rem 1.5rem;
  position: relative;
  text-align: center;
}

.page-about .about-trust-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--about-hero-line);
  transform: skewX(-12deg);
}

.page-about .about-trust-quote {
  margin: 0 auto 1.5rem;
  max-width: 56ch;
}

.page-about .about-trust-quote p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
  margin: 0;
}

.page-about .about-trust-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ===== 响应式增强 ===== */
@media (min-width: 720px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-hero-aside {
    padding: 1.75rem 1.5rem;
    margin-top: 0.75rem;
  }

  .page-about .about-bento {
    grid-template-columns: 1.35fr 1fr;
    align-items: stretch;
  }

  .page-about .about-profile-intro {
    flex-direction: row;
    align-items: flex-start;
    padding: 2rem;
  }

  .page-about .about-logo-figure {
    align-self: flex-start;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: 1.4fr 1fr;
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-timeline-card {
    padding: 1.75rem 1.5rem;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

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

  .page-about .about-trust-inner {
    padding: 2.5rem 3rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-cred-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .page-about .about-profile-intro {
    padding: 2.25rem;
  }

  .page-about .about-profile-stats {
    padding: 2rem 1.75rem;
  }

  .page-about .about-timeline-card {
    padding: 2rem 1.75rem;
  }
}