.page-about {
  --about-cyan: #00E5FF;
  --about-pink: #FF3E9A;
  --about-purple-light: #7A5FA8;
  --about-purple-deep: #1D1133;
  --about-purple-dark: #2D1B4E;
  --about-white: #FFFFFF;
  --about-mist: #E6E0F0;
  --about-gray: #A39FB8;
  --about-purple-black: #0A0A1A;
  --about-heading: Orbitron, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-transition: 0.25s ease;

  position: relative;
  font-family: var(--about-body);
  background: var(--about-purple-dark);
  color: var(--about-mist);
  line-height: 1.6;
  overflow-x: hidden;
}

.page-about__breadcrumb {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 20px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--about-gray);
}

.page-about__breadcrumb a {
  color: var(--about-cyan);
  text-decoration: none;
}

.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about__hero {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px 20px;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-bottom: 1px solid var(--about-purple-light);
}

.page-about__hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(122, 95, 168, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 95, 168, 0.12) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(135deg, transparent 0%, #000 100%);
  -webkit-mask-image: linear-gradient(135deg, transparent 0%, #000 100%);
  pointer-events: none;
}

.page-about__eyebrow {
  position: relative;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--about-cyan);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-family: var(--about-heading);
}

.page-about__title {
  position: relative;
  font-family: var(--about-heading);
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.2;
  font-weight: 900;
  color: var(--about-white);
  margin: 0 0 16px;
  max-width: 900px;
  text-shadow: 0 0 22px rgba(0, 229, 255, 0.3);
}

.page-about__lead {
  position: relative;
  font-size: 16px;
  max-width: 700px;
  color: var(--about-mist);
  margin: 0 0 20px;
}

.page-about__hero-meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about__section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  border-bottom: 1px solid rgba(122, 95, 168, 0.3);
  position: relative;
}

.page-about__section-index {
  font-family: var(--about-heading);
  font-size: 56px;
  font-weight: 900;
  line-height: 0.9;
  color: var(--about-purple-light);
  letter-spacing: -0.03em;
  opacity: 0.55;
  writing-mode: horizontal-tb;
  text-shadow: 0px 0px 18px rgba(0, 229, 255, 0.08);
}

.page-about__section-body {
  min-width: 0;
}

.page-about__section-text {
  font-size: 16px;
  color: var(--about-mist);
  max-width: 760px;
  margin: 12px 0 20px;
}

.page-about__origin-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding-top: 8px;
}

.page-about__fact-card {
  background: rgba(29, 17, 51, 0.6);
  border: 1px solid rgba(122, 95, 168, 0.3);
  padding: 18px 16px;
  position: relative;
  overflow: hidden;
}

.page-about__fact-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--about-cyan);
  opacity: 0.7;
}

.page-about__fact-num {
  font-family: var(--about-heading);
  font-size: 32px;
  font-weight: 900;
  color: var(--about-white);
  line-height: 1.1;
  margin: 0 0 4px;
}

.page-about__timeline-section {
  background: linear-gradient(180deg, var(--about-purple-dark) 0%, var(--about-purple-deep) 100%);
}

.page-about__timeline-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about__timeline-subtitle {
  color: var(--about-gray);
  font-size: 13px;
  margin-top: 4px;
}

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

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-cyan), var(--about-purple-light) 40%, var(--about-pink) 100%);
  opacity: 0.6;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 24px;
}

.page-about__timeline-item:last-child {
  margin-bottom: 0;
}

.page-about__timeline-node {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  width: 32px;
}

.page-about__timeline-node::before {
  content: "";
  width: 12px;
  height: 12px;
  background: var(--about-cyan);
  border: 3px solid var(--about-purple-dark);
  outline: 1px solid var(--about-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
  position: absolute;
  top: 0;
  left: 0;
}

.page-about__timeline-year {
  position: absolute;
  top: 18px;
  left: 0;
  font-family: var(--about-heading);
  font-size: 12px;
  font-weight: 700;
  color: var(--about-mist);
  white-space: nowrap;
}

.page-about__timeline-tag {
  display: inline-block;
  background: rgba(0, 229, 255, 0.15);
  color: var(--about-cyan);
  font-size: 11px;
  padding: 2px 8px;
  letter-spacing: 0.05em;
}

.page-about__timeline-card {
  background: rgba(29, 17, 51, 0.6);
  border: 1px solid rgba(122, 95, 168, 0.35);
  padding: 16px;
  transition: border-color var(--about-transition), transform var(--about-transition);
  margin-left: 0;
}

.page-about__timeline-card:hover {
  border-color: rgba(0, 229, 255, 0.6);
  transform: translateX(2px);
}

.page-about__timeline-card-title {
  font-family: var(--about-heading);
  font-size: 16px;
  color: var(--about-white);
  margin: 0 0 8px;
  font-weight: 700;
}

.page-about__timeline-card-text {
  font-size: 14px;
  color: var(--about-mist);
  line-height: 1.6;
  margin: 0 0 10px;
}

.page-about__timeline-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  margin-top: 12px;
  border: 1px solid rgba(122, 95, 168, 0.3);
  display: block;
}

.page-about__timeline-item--current .page-about__timeline-card {
  border-color: rgba(0, 229, 255, 0.5);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(29, 17, 51, 0.75));
}

.page-about__timeline-item--current .page-about__timeline-node::before {
  background: var(--about-pink);
  border-color: var(--about-purple-dark);
  outline-color: var(--about-pink);
  box-shadow: 0 0 16px rgba(255, 62, 154, 0.55);
}

.page-about__timeline-item--current .page-about__timeline-tag {
  background: rgba(255, 62, 154, 0.18);
  color: var(--about-pink);
}

.page-about__version-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about__version-item {
  background: rgba(29, 17, 51, 0.6);
  border-left: 3px solid var(--about-cyan);
  padding: 14px 16px;
  display: grid;
  grid-template-columns: 32px 1fr;
  grid-template-rows: auto auto;
  column-gap: 12px;
  align-items: start;
}

.page-about__version-num {
  grid-row: 1 / 3;
  font-family: var(--about-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--about-cyan);
  padding-top: 3px;
}

.page-about__version-item-title {
  font-family: var(--about-heading);
  font-size: 15px;
  color: var(--about-white);
  font-weight: 700;
}

.page-about__version-item-desc {
  font-size: 13px;
  color: var(--about-gray);
  line-height: 1.6;
  grid-column: 2;
}

.page-about__version-note {
  font-size: 14px;
  color: var(--about-mist);
  border-left: 2px solid var(--about-pink);
  padding-left: 12px;
}

.page-about__columns-layer {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about__layer-card {
  padding: 20px 16px;
  border: 1px solid rgba(122, 95, 168, 0.35);
  position: relative;
}

.page-about__layer-card--core {
  background: rgba(0, 229, 255, 0.05);
  border-top: 3px solid var(--about-cyan);
}

.page-about__layer-card--deep {
  background: rgba(29, 17, 51, 0.7);
  border-top: 3px solid var(--about-purple-light);
}

.page-about__layer-card--life {
  background: rgba(255, 62, 154, 0.04);
  border-top: 3px solid var(--about-pink);
}

.page-about__layer-tag {
  margin-bottom: 8px;
}

.page-about__layer-title {
  font-family: var(--about-heading);
  font-size: 20px;
  color: var(--about-white);
  margin: 8px 0 6px;
}

.page-about__layer-text {
  font-size: 13px;
  color: var(--about-mist);
  margin: 0;
}

.page-about__columns-link {
  margin-top: 4px;
}

.page-about__commitment-list {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
}

.page-about__commitment-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(122, 95, 168, 0.25);
}

.page-about__commitment-title {
  font-family: var(--about-heading);
  font-size: 18px;
  color: var(--about-cyan);
  font-weight: 700;
}

.page-about__commitment-desc {
  font-size: 14px;
  color: var(--about-mist);
}

.page-about__motto {
  font-family: var(--about-heading);
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 900;
  color: var(--about-white);
  text-align: right;
  letter-spacing: 0.02em;
  margin: 24px 0 0;
  text-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
  background: linear-gradient(90deg, var(--about-cyan), var(--about-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-about__commitment-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(122, 95, 168, 0.3);
  margin-top: 8px;
}

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

.page-about__more-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  text-decoration: none;
  background: rgba(29, 17, 51, 0.6);
  border: 1px solid rgba(122, 95, 168, 0.3);
  transition: border-color var(--about-transition), transform var(--about-transition);
}

.page-about__more-link:hover,
.page-about__more-link:focus-visible {
  border-color: var(--about-cyan);
  transform: translateY(-2px);
}

.page-about__more-link-title {
  font-family: var(--about-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--about-white);
}

.page-about__more-link .caption {
  color: var(--about-gray);
  font-size: 13px;
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 72px 40px 32px;
    min-height: 380px;
  }

  .page-about__title {
    font-size: 56px;
  }

  .page-about__lead {
    font-size: 18px;
    max-width: 700px;
  }

  .page-about__section {
    grid-template-columns: 120px 1fr;
    gap: 24px;
    padding: 56px 40px;
  }

  .page-about__section-index {
    font-size: 64px;
  }

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

  .page-about__timeline-head {
    grid-column: 2;
    align-items: flex-start;
  }

  .page-about__timeline-list {
    grid-column: 2;
  }

  .page-about__timeline-list::before {
    left: -12px;
  }

  .page-about__timeline-item {
    padding-left: 0;
  }

  .page-about__timeline-node {
    position: absolute;
    left: -76px;
    top: 0;
    width: auto;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
  }

  .page-about__timeline-node::before {
    right: -12px;
    left: auto;
    top: 2px;
  }

  .page-about__timeline-year {
    top: 0;
    left: auto;
    right: 0;
    font-size: 13px;
    transform: translateX(-24px);
  }

  .page-about__timeline-tag {
    transform: translateX(-26px);
  }

  .page-about__timeline-card {
    max-width: 760px;
    padding: 20px;
  }

  .page-about__timeline-img {
    max-width: 360px;
  }

  .page-about__version-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__columns-layer {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__commitment {
    grid-template-columns: 120px 1fr;
  }

  .page-about__commitment-img {
    grid-column: 2;
    max-width: 700px;
  }

  .page-about__commitment-list {
    grid-column: 2;
  }

  .page-about__commitment-item {
    grid-template-columns: 1fr 2fr;
    gap: 16px;
  }

  .page-about__motto {
    grid-column: 2;
    text-align: right;
  }

  .page-about__more-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about__more-links {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__columns-layer {
    gap: 20px;
  }

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

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