.page-about {
  --about-gold: #F5C518;
  --about-cyan: #00D4FF;
  --about-purple: #6A5ACD;
  --about-grid-line: rgba(148, 163, 184, 0.12);
  --about-card-bg: rgba(255, 255, 255, 0.055);
  --about-card-border: rgba(255, 255, 255, 0.14);
  --about-hover-gold: rgba(245, 197, 24, 0.9);
  background:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  background-color: #0A1628;
  color: #F8FAFC;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  position: relative;
  overflow-x: hidden;
}

.page-about a {
  color: #F8FAFC;
  text-decoration: none;
}

.page-about__breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 88px 24px 0;
  font-size: 0.8125rem;
  color: #94A3B8;
}

.page-about__breadcrumb .breadcrumb__link {
  color: #94A3B8;
  transition: color 0.2s ease;
}

.page-about__breadcrumb .breadcrumb__link:hover {
  color: #F5C518;
}

.page-about__breadcrumb .breadcrumb__sep {
  margin: 0 8px;
  color: rgba(148, 163, 184, 0.6);
}

.page-about__breadcrumb .breadcrumb__current {
  color: #F8FAFC;
  font-weight: 500;
}

/* ===== HERO ===== */
.page-about__hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 72px;
  position: relative;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  top: 20px;
  right: 0;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(106, 90, 205, 0.28) 0%, rgba(106, 90, 205, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about__hero-split {
  display: flex;
  flex-direction: column;
  gap: 36px;
  position: relative;
  z-index: 1;
}

.page-about__hero-left {
  flex: 1;
}

.page-about__hero-label {
  margin-bottom: 14px;
}

.page-about__hero-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 560px;
}

.page-about__hero-subtitle {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.5;
  color: #F5C518;
  margin: 0 0 14px;
  max-width: 520px;
}

.page-about__hero-desc {
  font-size: 1.05rem;
  color: #B0BEC5;
  margin: 0 0 28px;
  max-width: 500px;
  border-left: 3px solid rgba(245, 197, 24, 0.5);
  padding-left: 18px;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-bottom: 32px;
}

.page-about__hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: #94A3B8;
  letter-spacing: 0.02em;
}

.page-about__hero-meta-dot {
  width: 6px;
  height: 6px;
  background: #10B981;
  border-radius: 0;
  display: inline-block;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.7);
}

.page-about__hero-meta-item:nth-child(2) .page-about__hero-meta-dot {
  background: #F5C518;
  box-shadow: 0 0 8px rgba(245, 197, 24, 0.5);
}

.page-about__hero-meta-item:nth-child(3) .page-about__hero-meta-dot {
  background: #00D4FF;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
}

.page-about__hero-btn {
  display: inline-block;
}

.page-about__hero-right {
  flex: 1;
}

.page-about__hero-visual {
  position: relative;
  max-width: 520px;
  margin-left: auto;
}

.page-about__hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__hero-overlay {
  position: absolute;
  left: 16px;
  bottom: 16px;
  background: rgba(10, 22, 40, 0.85);
  border: 1px solid rgba(245, 197, 24, 0.4);
  padding: 10px 16px;
  backdrop-filter: blur(6px);
}

.page-about__hero-code {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #F5C518;
}

/* ===== TIMELINE ===== */
.page-about__timeline-section {
  background: linear-gradient(180deg, rgba(7, 15, 30, 0.4) 0%, rgba(10, 22, 40, 0.85) 100%);
  border-top: 1px solid rgba(245, 197, 24, 0.16);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  padding: 72px 24px;
}

.page-about__timeline-split {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about__timeline-intro {
  flex: 1;
}

.page-about__section-label {
  color: #F5C518;
  margin-bottom: 12px;
  font-family: "Inter", "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-about__timeline-title,
.page-about__stats-title,
.page-about__values-title,
.page-about__resources-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 800;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.page-about__timeline-intro-desc {
  color: #94A3B8;
  font-size: 1rem;
  margin: 0 0 16px;
  max-width: 560px;
}

.page-about__timeline-wrap {
  flex: 1.2;
  position: relative;
  padding-left: 32px;
  max-width: 620px;
}

.page-about__timeline-rail {
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 4px;
  z-index: 0;
  pointer-events: none;
}

.page-about__timeline-svg {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 520px;
}

.page-about__timeline-years {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 24px;
  z-index: 1;
  pointer-events: none;
}

.page-about__timeline-year-label {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(148, 163, 184, 0.35);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transition: color 0.3s ease;
}

.page-about__timeline-year-label.is-active {
  color: #F5C518;
}

.page-about__timeline-list {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about__milestone {
  position: relative;
  display: flex;
  gap: 20px;
  background: transparent;
  transition: background 0.3s ease;
  padding: 10px 0;
}

.page-about__milestone-node {
  position: absolute;
  left: -30px;
  top: 20px;
  background: #0A1628;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}

.page-about__milestone-node svg {
  display: block;
  transition: transform 0.3s ease;
}

.page-about__milestone-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 20px;
  flex: 1;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about__milestone-card:hover {
  border-color: rgba(245, 197, 24, 0.45);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.page-about__milestone-year {
  color: #F5C518;
  display: block;
  margin-bottom: 6px;
}

.page-about__milestone-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about__milestone-desc {
  font-size: 0.9375rem;
  color: #94A3B8;
  margin: 0;
}

/* ===== STATS ===== */
.page-about__stats-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 88px 24px;
}

.page-about__stats-header {
  margin-bottom: 48px;
}

.page-about__stats-desc {
  color: #94A3B8;
  font-size: 1rem;
  max-width: 560px;
  margin: 0;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.page-about__stat-card {
  background: linear-gradient(135deg, rgba(106, 90, 205, 0.18) 0%, rgba(10, 22, 40, 0.35) 60%, rgba(245, 197, 24, 0.09) 100%);
  border: 1px solid rgba(148, 163, 184, 0.18);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-left: 3px solid #F5C518;
}

.page-about__stat-num {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: #F8FAFC;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #F5C518 0%, #00D4FF 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}

.page-about__stat-num sup {
  font-size: 0.6em;
}

.page-about__stat-label {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  color: #F8FAFC;
}

.page-about__stat-note {
  font-size: 0.8125rem;
  color: #94A3B8;
}

.page-about__stats-visual {
  position: relative;
  max-width: 620px;
}

.page-about__stats-img,
.page-about__values-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.page-about__stats-caption {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  padding-bottom: 14px;
}

.page-about__stats-caption-title {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-weight: 700;
  font-size: 0.8125rem;
  color: #F5C518;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-about__stats-caption-text {
  font-size: 0.875rem;
  color: #94A3B8;
}

/* ===== VALUES ===== */
.page-about__values-section {
  background: linear-gradient(180deg, rgba(7, 15, 30, 0.5) 0%, rgba(10, 22, 40, 0.4) 100%);
  border-top: 1px solid rgba(148, 163, 184, 0.12);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  padding: 88px 24px;
}

.page-about__values-split {
  max-width: 1200px;
  margin: 0 auto 48px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about__values-intro {
  flex: 1;
}

.page-about__values-intro-desc {
  color: #94A3B8;
  font-size: 1rem;
  margin: 0;
  max-width: 520px;
}

.page-about__values-list {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about__value-item {
  display: flex;
  gap: 18px;
  padding: 20px 0 20px 20px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  position: relative;
}

.page-about__value-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 8px;
  background: #F5C518;
  opacity: 0.6;
}

.page-about__value-index {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: rgba(245, 197, 24, 0.35);
  flex-shrink: 0;
  line-height: 1.3;
}

.page-about__value-content {
  flex: 1;
}

.page-about__value-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 0 6px;
  transition: color 0.25s ease;
}

.page-about__value-item:hover .page-about__value-title {
  color: #F5C518;
}

.page-about__value-desc {
  font-size: 0.9375rem;
  color: #94A3B8;
  margin: 0;
}

.page-about__values-visual {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about__values-img {
  max-height: 360px;
  object-fit: cover;
}

/* ===== QUALIFICATION ===== */
.page-about__qualification-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 88px 24px;
}

.page-about__qualification-inner {
  background: linear-gradient(135deg, rgba(245, 197, 24, 0.1) 0%, rgba(10, 22, 40, 0.6) 45%, rgba(106, 90, 205, 0.2) 100%);
  border: 1px solid rgba(245, 197, 24, 0.25);
  padding: 40px 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  overflow: hidden;
}

.page-about__qualification-inner::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.page-about__qualification-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: rgba(245, 197, 24, 0.12);
  border: 1px solid rgba(245, 197, 24, 0.4);
}

.page-about__qualification-content {
  flex: 1;
}

.page-about__qualification-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 8px 0 16px;
}

.page-about__qualification-desc {
  color: #94A3B8;
  font-size: 0.9375rem;
  margin: 0 0 10px;
  max-width: 680px;
}

.page-about__qualification-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  flex-shrink: 0;
  align-items: flex-start;
}

.page-about__qualification-btn {
  white-space: nowrap;
}

/* ===== RESOURCES ===== */
.page-about__resources-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}

.page-about__resources-title {
  margin-bottom: 36px;
}

.page-about__resources-grid {
  gap: 20px;
}

.page-about__resource-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.page-about__resource-card:hover {
  border-color: rgba(245, 197, 24, 0.45);
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.08);
}

.page-about__resource-card-title {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-size: 1.0625rem;
  margin: 0;
}

.page-about__resource-card .card__desc {
  color: #94A3B8;
  font-size: 0.9375rem;
  margin: 0;
  flex: 1;
}

.page-about__resource-card .card__link {
  color: #F5C518;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  margin-top: 12px;
  display: inline-block;
  transition: transform 0.25s ease;
}

.page-about__resource-card:hover .card__link {
  transform: translateX(4px);
}

/* ===== MEDIA QUERIES ===== */
@media (min-width: 640px) {
  .page-about__stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__hero-split {
    flex-direction: row;
    align-items: center;
  }

  .page-about__hero-right {
    display: flex;
    justify-content: flex-end;
  }

  .page-about__timeline-list {
    gap: 32px;
  }

  .page-about__values-list {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }
}

@media (min-width: 960px) {
  .page-about__timeline-split {
    flex-direction: row;
    gap: 60px;
  }

  .page-about__timeline-intro {
    max-width: 380px;
    flex: 0 0 38%;
  }

  .page-about__timeline-wrap {
    flex: 1;
    padding-left: 52px;
  }

  .page-about__timeline-rail {
    left: 12px;
  }

  .page-about__timeline-years {
    left: 28px;
    gap: 30px;
  }

  .page-about__milestone-node {
    left: -40px;
  }

  .page-about__values-split {
    flex-direction: row;
    gap: 60px;
  }

  .page-about__stat-num {
    font-size: clamp(2.2rem, 3.5vw, 2.8rem);
  }

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

  .page-about__stats-visual {
    max-width: 760px;
  }

  .page-about__qualification-inner {
    flex-direction: row;
    align-items: flex-start;
    padding: 48px 40px;
  }

  .page-about__qualification-icon {
    margin-top: 4px;
  }

  .page-about__qualification-actions {
    flex-direction: column;
    padding-top: 4px;
  }

  .page-about__resources-grid {
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}