.page-about {
  --about-gap: clamp(1rem, 2.4vw, 2rem);
  --about-track-x: 8px;
  background-image:
    linear-gradient(rgba(0, 168, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 168, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--color-text);
  padding-top: 1.5rem;
}

.page-about .breadcrumbs {
  margin-bottom: 1.25rem;
}

.page-about .section {
  margin-bottom: var(--about-gap);
}

.page-about .section-head {
  align-items: baseline;
}

/* ========== 刊头首屏 ========== */
.page-about .about-masthead {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3.25rem) clamp(1rem, 3vw, 2.5rem);
  border: 1px solid var(--color-border);
  background:
    radial-gradient(ellipse at 85% 0%, rgba(0, 168, 255, 0.16), transparent 55%),
    radial-gradient(ellipse at 15% 100%, rgba(255, 46, 63, 0.09), transparent 45%),
    linear-gradient(135deg, #0B0E14 0%, #141A2A 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02), 0 24px 70px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, transparent 0%, rgba(0, 168, 255, 0.06) 50%, transparent 100%);
}

.page-about .about-masthead-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-dim);
  border-bottom: 1px solid rgba(42, 52, 84, 0.8);
  padding-bottom: 0.75rem;
}

.page-about .about-edition {
  color: var(--color-gold);
  font-weight: 700;
  background: rgba(255, 215, 0, 0.08);
  border: 1px solid rgba(255, 215, 0, 0.35);
  padding: 0.2rem 0.6rem;
  letter-spacing: 0.08em;
}

.page-about .about-masthead h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 1.25rem 0 1rem;
  text-wrap: balance;
  color: var(--color-text);
}

.page-about .about-masthead .page-lead {
  max-width: 72%;
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  line-height: 1.75;
  color: var(--color-dim);
  margin-bottom: 1.75rem;
}

.page-about .about-masthead-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(42, 52, 84, 0.8);
  padding-top: 1.25rem;
}

.page-about .about-stat {
  text-align: left;
}

.page-about .about-stat + .about-stat {
  padding-left: 1rem;
  border-left: 1px solid rgba(42, 52, 84, 0.6);
}

.page-about .about-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.1;
}

.page-about .about-stat-label {
  display: block;
  font-size: 0.72rem;
  color: var(--color-dim);
  letter-spacing: 0.08em;
  margin-top: 0.35rem;
}

/* ========== 品牌档案 ========== */
.page-about .profile-layout {
  display: grid;
  gap: var(--about-gap);
}

.page-about .profile-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.page-about .metric-block {
  background: #101724;
  padding: 1rem 1.1rem 1.2rem;
  min-height: 92px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.45rem;
  position: relative;
  transition: background 0.25s, border-color 0.25s;
}

.page-about .metric-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 22px;
  background: var(--grad-accent);
  opacity: 0.75;
}

.page-about .metric-block:hover,
.page-about .metric-block:focus-within {
  background: #141c30;
}

.page-about .metric-key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  text-transform: uppercase;
}

.page-about .metric-value {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  word-break: break-word;
}

.page-about .metric-block:nth-child(2) .metric-value,
.page-about .metric-block:nth-child(6) .metric-value,
.page-about .metric-block:nth-child(8) .metric-value {
  color: var(--color-gold);
}

.page-about .metric-block:nth-child(3) .metric-value,
.page-about .metric-block:nth-child(5) .metric-value {
  color: var(--color-blue);
}

.page-about .metric-block:nth-child(7) .metric-value {
  color: var(--color-red);
}

.page-about .profile-narrative {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .profile-narrative p {
  margin: 0;
  line-height: 1.8;
  color: var(--color-dim);
  font-size: 0.95rem;
}

.page-about .profile-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  padding: 1px;
  margin: 0.25rem 0;
}

.page-about .profile-facts div {
  background: rgba(11, 14, 20, 0.85);
  padding: 0.8rem 0.9rem;
}

.page-about .profile-facts dt {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  font-family: var(--font-mono);
}

.page-about .profile-facts dd {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-gold);
  word-break: break-word;
}

.page-about .link-btn {
  align-self: flex-start;
  margin-top: 0.25rem;
}

.page-about .profile-figure {
  position: relative;
  aspect-ratio: 3 / 4;
  max-height: 640px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin: 0.5rem 0 0;
  background: var(--color-bg-alt);
  transition: border-color 0.25s, transform 0.3s;
}

.page-about .profile-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(0, 168, 255, 0.35);
  pointer-events: none;
}

.page-about .profile-figure:hover {
  border-color: rgba(0, 168, 255, 0.6);
}

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

.page-about .profile-figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  background: rgba(11, 14, 20, 0.76);
  border: 1px solid rgba(42, 52, 84, 0.9);
  padding: 0.3rem 0.6rem;
}

/* ========== 发展历程 ========== */
.page-about .milestone-track {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .milestone-item {
  position: relative;
  padding-left: 34px;
  margin-bottom: var(--about-gap);
}

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 14px;
  bottom: -1rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(0, 168, 255, 0.55), rgba(255, 46, 63, 0.2));
}

.page-about .milestone-item:last-child::before {
  display: none;
}

.page-about .milestone-meta {
  margin-bottom: 0.4rem;
}

.page-about .milestone-year {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-blue);
}

.page-about .milestone-dot {
  position: absolute;
  left: 8px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-blue);
  box-shadow: 0 0 0 4px rgba(0, 168, 255, 0.14);
  transition: transform 0.25s, background 0.25s, box-shadow 0.25s;
}

.page-about .milestone-item:hover .milestone-dot,
.page-about .milestone-item:focus-visible .milestone-dot,
.page-about .milestone-item:focus-within .milestone-dot {
  transform: scale(1.35);
  background: var(--color-red);
}

.page-about .milestone-card {
  position: relative;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-blue);
  background: linear-gradient(180deg, rgba(11, 14, 20, 0.75), rgba(26, 35, 51, 0.82));
  padding: 1rem 1.1rem 1.15rem;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.page-about .milestone-item:hover .milestone-card,
.page-about .milestone-item:focus-within .milestone-card {
  background: rgba(26, 38, 60, 0.92);
  border-color: rgba(0, 168, 255, 0.45);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
}

.page-about .milestone-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 700;
  margin: 0.5rem 0 0.4rem;
  color: var(--color-text);
}

.page-about .milestone-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-dim);
}

.page-about .milestone-item--current .milestone-year {
  color: var(--color-gold);
}

.page-about .milestone-item--current .milestone-dot {
  background: var(--color-red);
  box-shadow: 0 0 0 4px rgba(255, 46, 63, 0.2);
}

.page-about .milestone-item--current .milestone-card {
  border-left-color: var(--color-gold);
  background: rgba(30, 28, 34, 0.92);
}

.page-about .timeline-footnote {
  margin: 1rem 0 0;
  font-size: 0.88rem;
  color: var(--color-dim);
}

.page-about .timeline-footnote a {
  color: var(--color-blue);
  text-underline-offset: 4px;
}

/* ========== 技术认证 ========== */
.page-about .certs-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .cert-badge {
  position: relative;
  border: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(11, 14, 20, 0.7), rgba(26, 35, 51, 0.85));
  padding: 1.5rem 1rem 1.3rem;
  text-align: center;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, background 0.25s;
}

.page-about .cert-badge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--grad-accent);
  opacity: 0.75;
}

.page-about .cert-badge::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-top: 1px solid rgba(0, 168, 255, 0.6);
  border-right: 1px solid rgba(0, 168, 255, 0.6);
}

.page-about .cert-badge:hover,
.page-about .cert-badge:focus-within {
  transform: translateY(-3px);
  border-color: rgba(0, 168, 255, 0.45);
  background: rgba(24, 36, 54, 0.95);
}

.page-about .cert-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0, 168, 255, 0.1);
  color: var(--color-blue);
  margin-bottom: 0.9rem;
}

.page-about .cert-badge:nth-child(2) .cert-icon {
  background: rgba(255, 46, 63, 0.1);
  color: var(--color-red);
}

.page-about .cert-badge:nth-child(3) .cert-icon {
  background: rgba(255, 215, 0, 0.1);
  color: var(--color-gold);
}

.page-about .cert-icon svg {
  width: 44px;
  height: 44px;
}

.page-about .cert-badge h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  color: var(--color-text);
}

.page-about .cert-badge p {
  margin: 0 0 0.8rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--color-dim);
}

.page-about .cert-status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--color-blue);
  border: 1px solid rgba(0, 168, 255, 0.35);
  padding: 0.2rem 0.5rem;
}

.page-about .cert-badge:nth-child(2) .cert-status {
  color: var(--color-red);
  border-color: rgba(255, 46, 63, 0.35);
}

.page-about .cert-badge:nth-child(3) .cert-status {
  color: var(--color-gold);
  border-color: rgba(255, 215, 0, 0.35);
}

.page-about .certs-note {
  margin: 1rem 0 0;
  font-size: 0.88rem;
  color: var(--color-dim);
  line-height: 1.75;
}

.page-about .certs-img-wrap {
  position: relative;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  margin-top: 1rem;
  overflow: hidden;
}

.page-about .certs-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .certs-img-label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  background: rgba(11, 14, 20, 0.76);
  border: 1px solid rgba(42, 52, 84, 0.9);
  padding: 0.3rem 0.6rem;
}

/* ========== 合作生态 ========== */
.page-about .eco-banner {
  position: relative;
  border: 1px solid var(--color-border);
  overflow: hidden;
  margin-top: 1.5rem;
}

.page-about .eco-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  object-position: center;
}

.page-about .eco-banner-label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  background: rgba(11, 14, 20, 0.76);
  border: 1px solid rgba(42, 52, 84, 0.9);
  padding: 0.3rem 0.6rem;
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-top: 1rem;
}

.page-about .eco-stat {
  background: rgba(11, 14, 20, 0.88);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: background 0.25s;
}

.page-about .eco-stat:hover {
  background: rgba(20, 28, 44, 0.92);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
}

.page-about .eco-stat:nth-child(1) .eco-num {
  color: var(--color-blue);
}

.page-about .eco-stat:nth-child(2) .eco-num {
  color: var(--color-red);
}

.page-about .eco-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--color-dim);
  margin-top: 0.5rem;
  text-transform: uppercase;
}

.page-about .eco-note {
  margin: 1rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--color-dim);
}

/* ========== 老用户导航服务 ========== */
.page-about .navservice-layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: 1.5rem;
}

.page-about .navservice-content p {
  margin: 0 0 1rem;
  line-height: 1.8;
  color: var(--color-dim);
  font-size: 0.95rem;
}

.page-about .navservice-content .list-dash {
  margin-bottom: 1.25rem;
}

.page-about .navservice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.page-about .navservice-panel {
  position: relative;
  border: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 90% 10%, rgba(0, 168, 255, 0.12), transparent 40%),
    linear-gradient(180deg, var(--color-card), rgba(26, 35, 51, 0.45));
  padding: 1rem;
}

.page-about .navservice-panel::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-left: 1px solid rgba(255, 215, 0, 0.55);
  border-top: 1px solid rgba(255, 215, 0, 0.55);
}

.page-about .navservice-panel::after {
  content: "";
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 10px;
  height: 10px;
  border-right: 1px solid rgba(0, 168, 255, 0.55);
  border-bottom: 1px solid rgba(0, 168, 255, 0.55);
}

.page-about .navservice-panel-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(42, 52, 84, 0.8);
}

.page-about .navservice-checklist {
  margin: 0;
}

.page-about .navservice-checklist div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px dashed rgba(42, 52, 84, 0.7);
}

.page-about .navservice-checklist div:last-child {
  border-bottom: none;
}

.page-about .navservice-checklist dt {
  font-size: 0.8rem;
  color: var(--color-dim);
}

.page-about .navservice-checklist dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-gold);
}

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

  .page-about .eco-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .profile-figure {
    max-height: 520px;
  }
}

@media (min-width: 768px) {
  .page-about .milestone-track {
    margin-top: 2rem;
  }

  .page-about .milestone-item {
    display: grid;
    grid-template-columns: 110px 36px minmax(0, 1fr);
    padding-left: 0;
  }

  .page-about .milestone-meta {
    grid-column: 1;
    margin: 0;
  }

  .page-about .milestone-year {
    display: block;
    text-align: right;
    padding-right: 1.25rem;
    padding-top: 10px;
    font-size: 1rem;
  }

  .page-about .milestone-dot {
    left: 128px;
    top: 12px;
  }

  .page-about .milestone-item::before {
    left: 126px;
  }

  .page-about .milestone-card {
    grid-column: 3;
  }

  .page-about .about-masthead .page-lead {
    font-size: 1.05rem;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding-top: 2.5rem;
  }

  .page-about .profile-layout {
    grid-template-columns: minmax(300px, 5fr) minmax(340px, 6fr) minmax(200px, 3fr);
    align-items: start;
  }

  .page-about .profile-narrative {
    gap: 1.25rem;
  }

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

  .page-about .navservice-layout {
    grid-template-columns: minmax(0, 7fr) minmax(320px, 5fr);
    align-items: stretch;
  }

  .page-about .certs-img-wrap,
  .page-about .eco-banner {
    margin-top: 1.5rem;
  }
}