.page-about {
  --about-grid-line: rgba(0, 212, 255, 0.07);
  --about-green-glow: rgba(57, 255, 136, 0.6);
  position: relative;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ===== 01 品牌定位 ===== */
.about-positioning {
  position: relative;
  overflow: hidden;
}

.about-positioning::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
}

.about-positioning__grid {
  display: grid;
  gap: var(--space-5);
  padding-block: var(--space-5) var(--space-4);
}

.about-sidemeta {
  position: relative;
  z-index: 1;
  padding: var(--space-4) var(--space-3);
  border: 1px solid var(--border-dark);
  background: var(--bg-dark);
  clip-path: var(--clip-corner);
}

.about-sidemeta::before {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-bottom: 16px;
  background: var(--gradient-blue-green);
}

.about-sidemeta__kicker {
  margin: 0 0 18px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.04em;
  transform: skewX(-3deg);
}

.about-sidemeta__list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.about-sidemeta__row {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-dark);
}

.about-sidemeta__row dt {
  margin-bottom: 4px;
  font-size: 13px;
  color: var(--text-secondary);
}

.about-sidemeta__row dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.about-sidemeta__link {
  margin-top: 18px;
}

.about-positioning__main {
  min-width: 0;
}

.about-positioning__title {
  margin: 16px 0 18px;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
}

.about-positioning__lead {
  margin: 0 0 22px;
  padding-left: 16px;
  border-left: 4px solid var(--accent-green);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.8;
}

.about-positioning__body p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-positioning__figure,
.about-data__figure,
.about-team__figure {
  margin: 0;
  border: 1px solid var(--border-dark);
  background: var(--bg-dark);
}

.about-positioning__img,
.about-data__img,
.about-team__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.about-wave {
  display: block;
  width: 100%;
  height: 56px;
  margin-top: 8px;
}

/* ===== 通用区块头 ===== */
.about-section-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 32px;
  position: relative;
}

.about-section-head__num {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--accent-blue);
  text-transform: uppercase;
}

.about-section-head__title {
  margin: 0;
  font-size: 30px;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
}

.about-section-head__title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 22px;
  margin-right: 10px;
  background: var(--accent-green);
  transform: skewX(-8deg);
  vertical-align: -2px;
}

.about-section-head__desc {
  margin: 8px 0 0;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 60ch;
}

/* ===== 02 发展历程 ===== */
.about-timeline {
  padding-block: var(--space-5) var(--space-6);
}

.about-timeline__rail {
  position: relative;
  padding-left: 36px;
}

.about-timeline__rail::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent-blue) 12%, var(--accent-green) 88%, transparent);
}

.about-timeline__list {
  display: grid;
  gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-timeline__item {
  position: relative;
}

.about-timeline__node {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--accent-green);
  transform: rotate(45deg);
  box-shadow: 0 0 10px var(--about-green-glow);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%,
  100% {
    box-shadow: 0 0 6px var(--about-green-glow);
  }
  50% {
    box-shadow: 0 0 18px var(--about-green-glow);
  }
}

.about-timeline__year {
  margin: 0 0 8px;
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--accent-green);
}

.about-timeline__card {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--border-dark);
  background: var(--bg-dark);
  clip-path: var(--clip-corner);
  overflow: hidden;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.about-timeline__card::before {
  content: "";
  position: absolute;
  left: -120%;
  top: 0;
  bottom: 0;
  width: 60%;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.12), transparent);
  transform: skewX(-20deg);
  transition: left 0.4s var(--ease);
}

.about-timeline__item:hover .about-timeline__card {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.25);
}

.about-timeline__item:hover .about-timeline__card::before {
  left: 120%;
}

.about-timeline__item:hover .about-timeline__node {
  background: var(--accent-blue);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.8);
}

.about-timeline__card h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
}

.about-timeline__card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== 03 平台数据 ===== */
.about-data {
  position: relative;
  padding-block: var(--space-6) var(--space-5);
  background:
    radial-gradient(1200px 400px at 82% -10%, rgba(0, 212, 255, 0.12), transparent 60%),
    linear-gradient(180deg, var(--bg-dark), var(--bg-primary) 42%);
}

.about-data__grid {
  display: grid;
  gap: 16px;
}

.about-data__cell {
  position: relative;
  padding: 22px;
  border: 1px solid var(--border-dark);
  background: rgba(10, 14, 20, 0.6);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.about-data__cell::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-blue-green);
  opacity: 0.85;
}

.about-data__cell:nth-child(even)::after {
  background: linear-gradient(180deg, #39ff88 0%, #00d4ff 100%);
}

.about-data__cell:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.about-data__num {
  display: block;
  margin-bottom: 8px;
  font-size: 38px;
  line-height: 1;
  color: var(--accent-green);
}

.about-data__cell:nth-child(even) .about-data__num {
  color: var(--accent-blue);
}

.about-data__label {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 800;
}

.about-data__desc {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.about-data__note {
  margin: 24px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--accent-orange);
  background: rgba(255, 122, 26, 0.06);
  color: var(--text-secondary);
  line-height: 1.75;
}

.about-data__figure {
  margin-top: 24px;
}

/* ===== 04 合作与资质 ===== */
.about-partner {
  position: relative;
  padding-block: var(--space-6);
  background: var(--bg-dark);
}

.about-partner__grid {
  display: grid;
  gap: var(--space-5);
}

.about-partner__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-partner__item {
  padding: 18px 20px;
  border-left: 3px solid var(--accent-green);
  background: linear-gradient(90deg, rgba(57, 255, 136, 0.06), transparent 65%);
}

.about-partner__item:nth-child(2) {
  border-left-color: var(--accent-blue);
  background: linear-gradient(90deg, rgba(0, 212, 255, 0.06), transparent 65%);
}

.about-partner__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
}

.about-partner__item p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}

.about-partner__aside {
  position: relative;
  padding: var(--space-4);
  border: 1px solid var(--border-dark);
  clip-path: var(--clip-corner);
  background:
    linear-gradient(rgba(0, 212, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  align-self: start;
}

.about-partner__aside-label {
  margin: 0 0 12px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--accent-blue);
}

.about-partner__aside-text {
  margin: 0 0 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== 05 地域与团队 ===== */
.about-team {
  padding-block: var(--space-6);
}

.about-team__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.about-team__content h3 {
  margin: 0 0 14px;
  font-size: 24px;
  font-weight: 900;
  line-height: 1.3;
}

.about-team__content p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-team__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .about-positioning__title {
    font-size: 36px;
  }

  .about-data__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-data__num {
    font-size: 44px;
  }
}

@media (min-width: 960px) {
  .about-positioning__grid {
    grid-template-columns: 300px 1fr;
    gap: var(--space-6);
    padding-block: var(--space-6);
  }

  .about-sidemeta {
    position: sticky;
    top: 24px;
  }

  .about-positioning__title {
    font-size: 44px;
    margin-top: 20px;
  }

  /* 时间轴左右交替 */
  .about-timeline__rail {
    padding-left: 0;
  }

  .about-timeline__rail::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .about-timeline__list {
    gap: 56px 0;
  }

  .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 120px 1fr;
    align-items: start;
  }

  .about-timeline__year {
    grid-column: 2;
    grid-row: 1;
    padding: 8px 14px;
    background: var(--bg-primary);
    text-align: center;
    align-self: start;
    font-size: 17px;
  }

  .about-timeline__node {
    left: 50%;
    top: 26px;
    transform: translateX(-50%) rotate(45deg);
  }

  .about-timeline__card {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .about-timeline__item:nth-child(even) .about-timeline__card {
    grid-column: 3;
    text-align: left;
  }

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

  .about-partner__grid {
    grid-template-columns: 1fr 340px;
    gap: var(--space-6);
  }

  .about-team__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .about-team__figure {
    margin: 0;
  }
}

@media (min-width: 1200px) {
  .about-positioning__title {
    font-size: 52px;
  }

  .about-positioning__lead {
    font-size: 19px;
  }

  .about-data__num {
    font-size: 52px;
  }

  .about-data__desc {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-timeline__node {
    animation: none;
  }

  .about-timeline__card,
  .about-timeline__card::before,
  .about-data__cell {
    transition: none;
  }
}