.page-about {
  --about-gold-line: linear-gradient(90deg, #FFD700 0%, #FF6B35 100%);
  --about-panel-grad: linear-gradient(135deg, rgba(19, 41, 75, .92), rgba(27, 58, 107, .78));
  --about-grid-line: repeating-linear-gradient(90deg, rgba(255, 255, 255, .035) 0 1px, transparent 1px 56px);
  --about-grid-line-y: repeating-linear-gradient(0deg, rgba(255, 255, 255, .035) 0 1px, transparent 1px 42px);
  color: var(--white);
}

.page-about .about-hero {
  position: relative;
  padding: 24px 16px 48px;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg-blue) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(255, 215, 0, .14) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -60px;
  bottom: -100px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255, 107, 53, .12) 0%, transparent 68%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 32px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 8vw, 60px);
  line-height: 1.04;
  letter-spacing: .02em;
  margin: 0 0 18px;
  text-transform: uppercase;
}

.page-about .about-hero__lead {
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 42em;
  margin: 0 0 20px;
}

.page-about .about-hero__line {
  margin: 8px 0 24px;
  max-width: 520px;
}

.page-about .about-hero__line svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero__visual {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow);
  background: var(--bg-deep);
}

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

.page-about .about-hero__visual::after {
  content: "V4 快速访问";
  position: absolute;
  top: 14px;
  right: 14px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--bg);
  background: var(--gold);
  padding: 5px 12px 4px;
  border-radius: 4px 10px 4px 10px;
  text-transform: uppercase;
}

.page-about .about-section {
  padding: 56px 16px;
}

.page-about .about-section .section-head {
  margin-bottom: 28px;
}

.page-about .section-head .section-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--orange);
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 38px);
  line-height: 1.1;
  letter-spacing: .02em;
  margin: 0;
  text-transform: uppercase;
}

.page-about .about-who {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-who__main p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 14px;
}

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

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

.page-about .about-stat {
  background: var(--about-panel-grad);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 18px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--about-gold-line);
  opacity: .85;
}

.page-about .about-stat:hover {
  border-color: var(--border-gold);
  transform: translateY(-2px);
}

.page-about .about-stat__val {
  display: block;
  font-family: var(--font-display);
  font-size: 44px;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 8px;
  letter-spacing: .02em;
}

.page-about .about-stat__label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, #FFD700 0%, #FF6B35 100%);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__node {
  position: absolute;
  left: -34px;
  top: 14px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border-radius: 50%;
  transition: transform var(--transition);
}

.page-about .about-timeline__item:hover .about-timeline__node {
  transform: scale(1.18);
}

.page-about .about-timeline__node svg {
  width: 24px;
  height: 24px;
  display: block;
}

.page-about .about-timeline__content {
  min-width: 0;
}

.page-about .about-timeline__card {
  background: var(--about-panel-grad);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline__card:hover {
  border-color: var(--border-gold);
  box-shadow: 0 10px 28px rgba(0, 0, 0, .22);
}

.page-about .about-timeline__card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  user-select: none;
  position: relative;
}

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

.page-about .about-timeline__card summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--about-gold-line);
  opacity: 0;
  transition: opacity var(--transition);
}

.page-about .about-timeline__card[open] summary::before,
.page-about .about-timeline__card:hover summary::before {
  opacity: 1;
}

.page-about .about-timeline__version {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--gold);
  background: rgba(255, 215, 0, .08);
  border: 1px solid rgba(255, 215, 0, .35);
  border-radius: 6px;
  padding: 2px 10px;
  letter-spacing: .06em;
}

.page-about .about-timeline__name {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: .02em;
  margin: 0;
  flex: 1 1 auto;
  text-transform: uppercase;
}

.page-about .about-timeline__sign {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 215, 0, .08);
  border: 1px solid rgba(255, 215, 0, .3);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--gold);
  transition: transform var(--transition), background var(--transition);
}

.page-about .about-timeline__sign::before {
  content: "+";
}

.page-about .about-timeline__card[open] .about-timeline__sign::before {
  content: "−";
}

.page-about .about-timeline__body {
  padding: 2px 18px 18px;
  border-top: 1px solid rgba(255, 255, 255, .06);
  margin-top: 0;
}

.page-about .about-timeline__body p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 12px 0 10px;
}

.page-about .about-timeline__body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .about-timeline__body li {
  font-size: 13px;
  color: var(--muted);
  padding-left: 18px;
  position: relative;
}

.page-about .about-timeline__body li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 7px;
  width: 8px;
  height: 8px;
  background: rgba(255, 107, 53, .8);
  border-radius: 2px 6px 2px 6px;
}

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

.page-about .about-system__card {
  position: relative;
  background: var(--about-panel-grad);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px 22px 24px;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.page-about .about-system__card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--about-gold-line);
  opacity: 0;
  transition: opacity var(--transition);
}

.page-about .about-system__card:hover {
  border-color: var(--border-gold);
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, .24);
}

.page-about .about-system__card:hover::after {
  opacity: 1;
}

.page-about .about-system__card--replay::after,
.page-about .about-system__card--summary::after {
  background: linear-gradient(90deg, #FF6B35, #FFD700);
}

.page-about .about-system__index {
  position: absolute;
  right: 16px;
  top: 10px;
  font-family: var(--font-display);
  font-size: 52px;
  line-height: 1;
  color: rgba(255, 255, 255, .04);
  font-weight: 700;
  letter-spacing: -.02em;
  pointer-events: none;
}

.page-about .about-system__card h3 {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: .02em;
  margin: 0 0 10px;
  text-transform: uppercase;
  max-width: 15em;
}

.page-about .about-system__card h3 a {
  color: var(--white);
  text-decoration: none;
  background-image: linear-gradient(90deg, #FFD700, #FF6B35);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 2px;
  transition: background-size var(--transition), color var(--transition);
}

.page-about .about-system__card h3 a:hover {
  color: var(--gold);
  background-size: 100% 2px;
}

.page-about .about-system__card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 0 14px;
}

.page-about .about-system__card ul {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid rgba(255, 255, 255, .06);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-system__card li {
  font-size: 12px;
  color: var(--muted);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
}

.page-about .about-capability {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-capability__visual {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--bg-deep);
}

.page-about .about-capability__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-grid-line), var(--about-grid-line-y);
  opacity: .25;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-capability__visual img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

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

.page-about .about-skill {
  position: relative;
  background: var(--about-panel-grad);
  border: 1px solid var(--border);
  border-radius: 10px 20px 10px 20px;
  padding: 18px 18px 16px 44px;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-skill:hover {
  border-color: var(--border-gold);
  transform: translateX(4px);
}

.page-about .about-skill__num {
  position: absolute;
  left: 14px;
  top: 16px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-skill h3 {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .03em;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.page-about .about-skill p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-team__image {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--bg-deep);
}

.page-about .about-team__image img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-team__body .section-head {
  margin-bottom: 16px;
}

.page-about .about-team__body p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 14px;
}

.page-about .about-team__contact {
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
  background: rgba(255, 215, 0, .07);
  border-left: 3px solid var(--gold);
  border-radius: 0 8px 8px 0;
  padding: 12px 16px;
  margin: 18px 0 20px;
}

.page-about .about-team__body .hero-actions {
  margin-top: 8px;
}

.page-about .about-guide {
  padding: 48px 16px 72px;
}

.page-about .about-guide__inner {
  background: linear-gradient(135deg, #1B3A6B 0%, #0A1F44 100%);
  border: 1px solid var(--border-gold);
  border-radius: 18px;
  padding: 36px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-about .about-guide__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--about-gold-line);
}

.page-about .about-guide__inner::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255, 215, 0, .12) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-guide__inner h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 34px);
  text-transform: uppercase;
  letter-spacing: .02em;
  margin: 0 0 10px;
}

.page-about .about-guide__inner p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 auto 24px;
  max-width: 34em;
}

.page-about .about-guide__inner .hero-actions {
  justify-content: center;
}

@media (min-width: 768px) {
  .page-about .about-section {
    padding: 64px 0;
  }

  .page-about .about-hero {
    padding: 32px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 40px;
    align-items: center;
    margin-top: 44px;
  }

  .page-about .about-hero__visual {
    min-height: 420px;
  }

  .page-about .about-hero__visual img {
    width: 100%;
    height: 100%;
    min-height: 420px;
    object-fit: cover;
  }

  .page-about .about-who {
    grid-template-columns: 1.1fr .9fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-who__stats {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .page-about .about-timeline {
    padding-left: 42px;
    gap: 18px;
    max-width: 840px;
  }

  .page-about .about-timeline::before {
    left: 15px;
  }

  .page-about .about-timeline__node {
    left: -42px;
    width: 32px;
    height: 32px;
  }

  .page-about .about-timeline__node svg {
    width: 32px;
    height: 32px;
  }

  .page-about .about-timeline__card summary {
    padding: 18px 22px;
  }

  .page-about .about-timeline__body {
    padding: 4px 22px 22px;
  }

  .page-about .about-system {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }

  .page-about .about-capability {
    grid-template-columns: .9fr 1.1fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .about-capability__visual {
    height: 100%;
    min-height: 400px;
  }

  .page-about .about-capability__visual img {
    height: 100%;
    min-height: 400px;
    object-fit: cover;
  }

  .page-about .about-capability__list {
    gap: 14px;
  }

  .page-about .about-team {
    grid-template-columns: .95fr 1.05fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .about-team__image {
    height: 100%;
    min-height: 360px;
  }

  .page-about .about-team__image img {
    height: 100%;
    min-height: 360px;
    object-fit: cover;
  }

  .page-about .about-guide {
    padding: 48px 0 80px;
  }

  .page-about .about-guide__inner {
    padding: 48px 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-who {
    gap: 72px;
  }

  .page-about .about-capability {
    gap: 64px;
  }

  .page-about .about-skill {
    padding: 22px 22px 20px 52px;
  }

  .page-about .about-skill__num {
    left: 18px;
    top: 20px;
    font-size: 26px;
  }

  .page-about .about-team {
    gap: 64px;
  }
}