.page-about {
  --about-gap: clamp(20px, 4vw, 40px);
  --about-hero-min-height: clamp(560px, 82vh, 780px);
  background: var(--deep-space-900);
  overflow-x: clip;
}

/* —— 章节通用节奏 —— */
.page-about .about-chapter {
  padding: clamp(64px, 8vw, 112px) 0;
}

.page-about .section-head {
  margin-bottom: clamp(28px, 6vw, 56px);
}

/* —— 01 品牌档案摘要 —— */
.page-about .about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: stretch;
  overflow: hidden;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--signal-orange) 0 30%, var(--fluorescent-green) 30% 66%, var(--data-cyan) 66% 100%);
  opacity: 0.85;
  z-index: 2;
  pointer-events: none;
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 22, 51, 0.96) 0%, rgba(10, 22, 51, 0.78) 48%, rgba(10, 22, 51, 0.42) 100%),
    radial-gradient(circle at 80% 28%, rgba(0, 224, 255, 0.2), transparent 42%);
}

.page-about .about-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(48px, 7vw, 88px);
  flex: 1;
}

.page-about .about-brand-note {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
}

.page-about .about-brand-vertical {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.18em;
  color: var(--fluorescent-green);
  border-left: 3px solid var(--signal-orange);
  padding-left: 10px;
  line-height: 1.4;
}

.page-about .about-brand-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--data-cyan);
}

.page-about .about-hero-main {
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2vw, 28px);
}

.page-about .about-hero-title {
  max-width: 13em;
}

.page-about .about-hero-rule {
  display: block;
  width: 72px;
  height: 4px;
  background: linear-gradient(90deg, var(--fluorescent-green), var(--data-cyan));
  margin: 2px 0 0;
}

.page-about .about-hero .section-desc {
  max-width: 58ch;
}

.page-about .about-audience {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-audience li {
  border: 1px solid var(--line-blue);
  padding: 8px 14px;
  font-size: 0.8125rem;
  color: var(--ice-blue-100);
  background: rgba(16, 32, 74, 0.42);
}

.page-about .about-audience li::before {
  content: "●";
  color: var(--signal-orange);
  font-size: 0.5rem;
  margin-right: 8px;
  vertical-align: middle;
}

.page-about .about-hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(10px, 1.6vw, 18px);
  margin-top: 4px;
}

.page-about .about-hero-metrics .data-display {
  flex: 1 1 140px;
  padding: 16px 18px;
  border: 1px solid var(--line-blue);
  background: rgba(16, 32, 74, 0.5);
  transition: transform var(--transition), border-color var(--transition);
}

.page-about .about-hero-metrics .data-display:hover {
  transform: translateY(-4px);
  border-color: var(--fluorescent-green);
}

/* —— 02 发展历程里程碑 —— */
.page-about .about-milestone {
  background: var(--deep-space-800);
  border-top: 2px solid var(--data-cyan);
  border-bottom: 2px solid var(--data-cyan);
}

.page-about .about-milestone-grid {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

.page-about .about-milestone-figure {
  margin: 0;
  flex-shrink: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line-blue);
  background: var(--deep-space-800);
}

.page-about .about-milestone-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--data-cyan) 0%, var(--line-blue) 100%);
  opacity: 0.55;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 30px;
}

.page-about .about-timeline-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding: 10px 0 6px;
}

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

.page-about .about-timeline-item summary::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--deep-space-900);
  border: 2px solid var(--data-cyan);
  box-shadow: 0 0 0 2px rgba(0, 224, 255, 0.16);
}

.page-about .about-timeline-item[open] summary::before {
  background: var(--fluorescent-green);
  border-color: var(--fluorescent-green);
  box-shadow: 0 0 0 4px rgba(185, 255, 90, 0.18);
}

.page-about .about-timeline-year {
  font-family: var(--font-mono);
  font-size: 1.625rem;
  line-height: 1.1;
  font-weight: 700;
  color: var(--data-cyan);
}

.page-about .about-timeline-label {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--paper-white);
  letter-spacing: 0.02em;
}

.page-about .about-timeline-item[open] .about-timeline-label {
  color: var(--fluorescent-green);
}

.page-about .about-timeline-item summary:hover .about-timeline-label {
  color: var(--data-cyan);
}

.page-about .about-timeline-item p {
  margin: 2px 0 16px;
  color: var(--ice-blue-100);
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 46ch;
}

/* —— 03 资质与信息安全 —— */
.page-about .about-cert-layout {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

.page-about .about-cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-cert-item {
  background: var(--paper-white);
  color: var(--ink-black);
  border: 2px solid var(--ink-black);
  border-radius: 2px;
  padding: 22px 24px 18px;
  box-shadow: 8px 8px 0 rgba(0, 224, 255, 0.14);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-cert-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--fluorescent-green);
}

.page-about .about-cert-item::before {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  top: 12px;
  border-top: 2px dashed rgba(11, 18, 32, 0.2);
}

.page-about .about-cert-badge {
  display: inline-block;
  background: var(--ink-black);
  color: var(--paper-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 5px 12px;
  border-radius: 2px;
  margin-bottom: 12px;
  position: relative;
}

.page-about .about-cert-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--ink-black);
}

.page-about .about-cert-meta {
  display: block;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid rgba(11, 18, 32, 0.2);
  font-size: 0.8125rem;
  color: rgba(11, 18, 32, 0.62);
  font-family: var(--font-mono);
}

.page-about .about-cert-figure {
  margin: 0;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line-blue);
  background: var(--deep-space-800);
}

.page-about .about-cert-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* —— 04 团队与技术构成 —— */
.page-about .about-team-layout {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

.page-about .about-team-ring-wrap {
  border: 1px solid var(--line-blue);
  background: var(--deep-space-800);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  position: relative;
}

.page-about .about-team-ring {
  width: min(220px, 64vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--fluorescent-green) 0deg 90deg, var(--line-blue) 90deg 360deg);
  display: grid;
  place-items: center;
  position: relative;
}

.page-about .about-team-ring::before {
  content: "";
  position: absolute;
  width: 64%;
  height: 64%;
  border-radius: 50%;
  background: var(--deep-space-900);
}

.page-about .about-team-ring-num {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--fluorescent-green);
}

.page-about .about-team-ring-caption {
  margin: 0;
  color: var(--ice-blue-100);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-align: center;
}

.page-about .about-team-details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-team-details .data-display {
  border: 1px solid var(--line-blue);
  padding: 16px;
  background: rgba(16, 32, 74, 0.35);
}

.page-about .about-team-note {
  grid-column: 1 / -1;
  color: var(--ice-blue-100);
  border-left: 3px solid var(--signal-orange);
  padding-left: 16px;
  margin: 4px 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* —— 05 合作生态与伙伴 —— */
.page-about .about-partner {
  background: var(--deep-space-800);
  border-top: 2px solid var(--fluorescent-green);
  border-bottom: 2px solid var(--fluorescent-green);
}

.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-bottom: 24px;
}

.page-about .about-partner-card {
  margin: 0;
}

.page-about .about-partner-card-offset {
  transform: translateY(0);
}

.page-about .about-partner-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid var(--line-blue);
}

.page-about .about-partner-note p {
  margin: 0;
  color: var(--ice-blue-100);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* —— 06 荣誉与行业认可 —— */
.page-about .about-honor-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-honor-item {
  border: 1px solid var(--line-blue);
  border-top: 4px solid var(--signal-orange);
  background: var(--deep-space-800);
  padding: 26px 24px;
}

.page-about .about-honor-item:nth-child(2) {
  border-top-color: var(--fluorescent-green);
}

.page-about .about-honor-item:nth-child(3) {
  border-top-color: var(--data-cyan);
}

.page-about .about-honor-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  font-weight: 700;
  color: var(--signal-orange);
  margin-bottom: 14px;
}

.page-about .about-honor-item:nth-child(2) .about-honor-badge {
  color: var(--fluorescent-green);
}

.page-about .about-honor-item:nth-child(3) .about-honor-badge {
  color: var(--data-cyan);
}

.page-about .about-honor-item .card-body {
  margin: 0 0 14px;
}

.page-about .about-honor-footnote {
  margin-top: 28px;
  text-align: center;
  color: var(--ice-blue-100);
  font-size: 0.9375rem;
}

@media (min-width: 760px) {
  .page-about .about-team-details {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
    padding-top: 28px;
  }

  .page-about .about-partner-card-offset {
    transform: translateY(28px);
  }

  .page-about .about-honor-row {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-brand-note {
    justify-self: start;
    align-self: stretch;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    border-right: 1px solid var(--line-blue);
    padding-right: 28px;
  }

  .page-about .about-brand-vertical {
    writing-mode: vertical-rl;
    border-left: none;
    padding-left: 0;
    font-size: 1.5rem;
  }

  .page-about .about-brand-year {
    writing-mode: vertical-rl;
    letter-spacing: 0.42em;
  }

  .page-about .about-milestone-grid {
    display: grid;
    grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(28px, 5vw, 56px);
    align-items: start;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .page-about .about-timeline::before {
    left: 6%;
    right: 6%;
    top: 18px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--data-cyan) 0%, var(--line-blue) 100%);
  }

  .page-about .about-timeline-item {
    padding-left: 0;
    padding-top: 40px;
  }

  .page-about .about-timeline-item summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-timeline-item summary::before {
    left: 0;
    top: 12px;
  }

  .page-about .about-timeline-item p {
    font-size: 0.875rem;
    margin-top: 6px;
  }

  .page-about .about-cert-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
    gap: clamp(28px, 5vw, 64px);
    align-items: center;
  }

  .page-about .about-team-layout {
    display: grid;
    grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(28px, 5vw, 64px);
    align-items: center;
  }
}