.page-about {
  --about-gold: #D4AF37;
  --about-magenta: #FF2E88;
  --about-bronze: #2D8F82;
  --about-chu: #B22222;
  --about-text: #F4F4F8;
  --about-text-dim: #A0A5B8;
  --about-line: #3A4066;
  --about-base: #0A0E24;
  --about-base-2: #1A1438;
  --about-base-3: #2A1B4A;
  --about-font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --about-font-body: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  --about-radius-md: 10px;
  --about-ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --about-speed: 0.3s;

  position: relative;
  background: linear-gradient(135deg, #0A0E24 0%, #1A1438 50%, #2A1B4A 100%);
  color: var(--about-text);
  font-family: var(--about-font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about__breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 0;
  font-family: var(--about-font-title);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--about-text-dim);
}

.page-about__breadcrumb .breadcrumb__link {
  color: var(--about-text-dim);
  text-decoration: none;
  transition: color var(--about-speed) var(--about-ease);
}

.page-about__breadcrumb .breadcrumb__link:hover {
  color: var(--about-gold);
}

.page-about__breadcrumb .breadcrumb__sep {
  margin: 0 8px;
  color: var(--about-line);
}

.page-about__breadcrumb .breadcrumb__current {
  color: var(--about-gold);
}

.page-about__label {
  font-family: var(--about-font-title);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--about-gold);
  text-transform: uppercase;
}

.page-about__label::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--about-gold);
  vertical-align: middle;
  margin-right: 10px;
}

.section-label--bronze.page-about__label {
  color: var(--about-bronze);
}

.section-label--bronze.page-about__label::before {
  background: var(--about-bronze);
}

.page-about__story {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 20px;
}

.page-about__story::before {
  content: "";
  position: absolute;
  top: 40px;
  right: -120px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.14) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.page-about__story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  position: relative;
}

.page-about__story-copy {
  position: relative;
  z-index: 1;
}

.page-about__story-title {
  margin: 18px 0 20px;
  font-family: var(--about-font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: 0.08em;
  color: var(--about-text);
}

.page-about__story-lead {
  font-family: var(--about-font-title);
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--about-gold);
  margin: 0 0 24px;
  line-height: 1.7;
  max-width: 560px;
}

.page-about__story-body {
  font-size: 15px;
  color: var(--about-text-dim);
  margin: 0 0 18px;
  max-width: 640px;
}

.page-about__story-media {
  margin: 0;
  border-radius: var(--about-radius-md);
  overflow: hidden;
}

.page-about__story-media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, transparent 40%, rgba(10, 14, 36, 0.5) 100%);
  pointer-events: none;
  z-index: 1;
}

.page-about__timeline {
  max-width: 1200px;
  margin: 0 auto;
  padding: 90px 24px 40px;
  position: relative;
}

.page-about__timeline-head {
  max-width: 640px;
  margin-bottom: 56px;
}

.page-about__timeline-title {
  font-family: var(--about-font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 26px;
  line-height: 1.35;
  letter-spacing: 0.06em;
  color: var(--about-text);
  margin: 16px 0 14px;
}

.page-about__timeline-lead {
  font-size: 15px;
  color: var(--about-text-dim);
  margin: 0;
}

.page-about__timeline-wrap {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about__timeline-line {
  display: none;
}

.page-about__milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about__milestone {
  position: relative;
  padding-left: 28px;
  margin-bottom: 36px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: -30px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-bronze) 0%, var(--about-line) 100%);
}

.page-about__milestone:last-child::before {
  display: none;
}

.page-about__milestone-marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 14px;
  height: 14px;
}

.page-about__milestone-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-bronze);
  border: 2px solid var(--about-base-2);
  box-shadow: 0 0 0 3px rgba(45, 143, 130, 0.2);
  transition: background var(--about-speed) var(--about-ease), box-shadow var(--about-speed) var(--about-ease), transform var(--about-speed) var(--about-ease);
}

.page-about__milestone:hover .page-about__milestone-dot {
  background: var(--about-gold);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.22);
  transform: scale(1.15);
}

.page-about__milestone-card {
  background: rgba(26, 20, 56, 0.5);
  border: 1px solid rgba(58, 64, 102, 0.4);
  border-radius: var(--about-radius-md);
  padding: 20px 20px 16px;
  transition: border-color var(--about-speed) var(--about-ease), transform var(--about-speed) var(--about-ease), background var(--about-speed) var(--about-ease);
}

.page-about__milestone:hover .page-about__milestone-card {
  border-color: rgba(212, 175, 55, 0.45);
  transform: translateX(4px);
  background: rgba(42, 27, 74, 0.6);
}

.page-about__milestone-index {
  font-family: var(--about-font-title);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--about-bronze);
  margin: 0 0 6px;
}

.page-about__milestone-name {
  font-family: var(--about-font-title);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--about-text);
  margin: 0 0 8px;
}

.page-about__milestone-desc {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  line-height: 1.75;
}

.page-about__timeline-media {
  margin: 0;
  border-radius: var(--about-radius-md);
  overflow: hidden;
  max-width: 360px;
  align-self: end;
  justify-self: center;
}

.page-about__philosophy {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 40px;
  position: relative;
}

.page-about__philosophy::before {
  content: "";
  position: absolute;
  left: -160px;
  top: 120px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255, 46, 136, 0.08) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.page-about__philosophy-head {
  max-width: 640px;
  margin-bottom: 48px;
}

.page-about__philosophy-title {
  font-family: var(--about-font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 26px;
  line-height: 1.4;
  letter-spacing: 0.05em;
  color: var(--about-text);
  margin: 16px 0 14px;
}

.page-about__philosophy-lead {
  font-size: 15px;
  color: var(--about-text-dim);
  margin: 0;
}

.page-about__principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about__principle {
  position: relative;
  padding: 26px 24px 24px;
  border-left: 2px solid var(--about-line);
  background: linear-gradient(135deg, rgba(26, 20, 56, 0.4) 0%, rgba(10, 14, 36, 0.2) 100%);
  transition: border-color var(--about-speed) var(--about-ease), background var(--about-speed) var(--about-ease), transform var(--about-speed) var(--about-ease);
}

.page-about__principle:hover {
  border-left-color: var(--about-gold);
  background: rgba(26, 20, 56, 0.6);
  transform: translateY(-3px);
}

.page-about__principle-num {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--about-font-title);
  font-size: 28px;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: rgba(58, 64, 102, 0.5);
  transition: color var(--about-speed) var(--about-ease);
}

.page-about__principle:hover .page-about__principle-num {
  color: rgba(212, 175, 55, 0.5);
}

.page-about__principle-title {
  font-family: var(--about-font-title);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--about-text);
  margin: 0 0 10px;
  padding-right: 48px;
}

.page-about__principle-text {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  line-height: 1.8;
}

.page-about__inline-link {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  transition: border-color var(--about-speed) var(--about-ease), color var(--about-speed) var(--about-ease);
}

.page-about__inline-link:hover {
  color: var(--about-text);
  border-bottom-color: var(--about-text-dim);
}

.page-about__cert {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 40px;
}

.page-about__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about__cert-copy {
  position: relative;
}

.page-about__cert-title {
  font-family: var(--about-font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 26px;
  letter-spacing: 0.06em;
  color: var(--about-text);
  margin: 16px 0 14px;
  line-height: 1.35;
}

.page-about__cert-lead {
  font-size: 15px;
  color: var(--about-text-dim);
  margin: 0 0 28px;
  max-width: 600px;
}

.page-about__cert-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__cert-item {
  position: relative;
  padding: 18px 0 18px 22px;
  border-bottom: 1px solid rgba(58, 64, 102, 0.4);
}

.page-about__cert-item:first-child {
  border-top: 1px solid rgba(58, 64, 102, 0.4);
}

.page-about__cert-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--about-bronze);
  border: 2px solid var(--about-base);
}

.page-about__cert-term {
  font-family: var(--about-font-title);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--about-text);
  margin-bottom: 4px;
}

.page-about__cert-desc {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  line-height: 1.75;
}

.page-about__cert-media {
  margin: 0;
  border-radius: var(--about-radius-md);
  overflow: hidden;
  max-width: 360px;
  justify-self: center;
  align-self: center;
}

.page-about__trust {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 100px;
  text-align: center;
  position: relative;
}

.page-about__trust::before {
  content: "";
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.page-about__trust-title {
  font-family: var(--about-font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--about-text);
  margin: 0 0 16px;
  position: relative;
}

.page-about__trust-text {
  font-size: 15px;
  color: var(--about-text-dim);
  max-width: 680px;
  margin: 0 auto 32px;
  line-height: 1.85;
}

.page-about__trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  position: relative;
}

.page-about .btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 2px;
  font-family: var(--about-font-title);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: all var(--about-speed) var(--about-ease);
  cursor: pointer;
}

.page-about .btn--primary {
  background: var(--about-gold);
  color: var(--about-base);
  border: 1px solid var(--about-gold);
}

.page-about .btn--primary:hover {
  background: transparent;
  color: var(--about-gold);
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.6);
}

.page-about .btn--ghost {
  background: transparent;
  color: var(--about-text);
  border: 1px solid rgba(58, 64, 102, 0.8);
}

.page-about .btn--ghost:hover {
  border-color: var(--about-gold);
  color: var(--about-gold);
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.4);
}

.page-about__story-media,
.page-about__timeline-media,
.page-about__cert-media {
  position: relative;
}

.page-about__story-media img,
.page-about__timeline-media img,
.page-about__cert-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__story-media .media-frame__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__timeline-media .media-frame__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__cert-media .media-frame__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--about-radius-md);
}

.page-about .media-frame__caption {
  font-family: var(--about-font-title);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-text-dim);
  padding: 10px 2px 0;
}

@media (min-width: 768px) {
  .page-about__story {
    padding: 100px 40px 30px;
  }

  .page-about__story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
  }

  .page-about__story-title {
    font-size: 38px;
  }

  .page-about__story-lead {
    font-size: 18px;
  }

  .page-about__timeline {
    padding: 110px 40px 60px;
  }

  .page-about__timeline-head {
    margin-bottom: 64px;
  }

  .page-about__timeline-title {
    font-size: 32px;
  }

  .page-about__timeline-wrap {
    grid-template-columns: 1fr 240px;
    gap: 48px;
    align-items: start;
  }

  .page-about__timeline-line {
    display: block;
  }

  .page-about__philosophy {
    padding: 100px 40px 60px;
  }

  .page-about__philosophy-title {
    font-size: 32px;
  }

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

  .page-about__cert {
    padding: 100px 40px 60px;
  }

  .page-about__cert-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
    align-items: center;
  }

  .page-about__cert-title {
    font-size: 32px;
  }

  .page-about__trust {
    padding: 100px 40px 120px;
  }

  .page-about__trust-title {
    font-size: 28px;
  }
}

@media (min-width: 1200px) {
  .page-about__timeline-wrap {
    grid-template-columns: 1fr 300px;
    gap: 60px;
  }

  .page-about__milestone {
    padding-left: 36px;
  }
}