.page-about {
  background: var(--c-deep);
  color: var(--c-white);
  overflow-x: hidden;
}

/* ========== 封面 / 杂志刊头 ========== */
.page-about__cover {
  position: relative;
  padding: 36px 0 24px;
}
.page-about__cover::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -100px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 255, 136, 0.12), transparent 68%);
  pointer-events: none;
}
.page-about__cover-grid {
  display: grid;
  gap: 28px;
  position: relative;
  z-index: 1;
}
.page-about__cover-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--c-green);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 16px;
}
.page-about__cover-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 40px;
  line-height: 1.1;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.page-about__cover-lede {
  color: var(--c-mist);
  font-size: var(--text-base);
  line-height: 1.8;
  max-width: 34em;
  margin: 0 0 28px;
}
.page-about__cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about__cover-figure {
  margin: 0;
  position: relative;
}
.page-about__cover-figure::after {
  content: "";
  position: absolute;
  inset: 14px -12px -12px 14px;
  border: 1px solid rgba(0, 255, 136, 0.45);
  clip-path: var(--sharp-corner);
  pointer-events: none;
  z-index: -1;
}
.page-about__cover-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  margin-top: 40px;
}
.page-about__cover-strip span {
  background: var(--c-night);
  padding: 16px 14px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--c-cyan);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  letter-spacing: 0.04em;
}
.page-about__cover-strip span::after {
  content: "→";
  color: var(--c-green);
  font-weight: 700;
}

/* ========== 品牌简介 ========== */
.page-about__intro {
  padding-top: 60px;
  padding-bottom: 60px;
  position: relative;
}
.page-about__intro-grid {
  display: grid;
  gap: 36px;
  margin-top: 32px;
}
.page-about__intro-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about__intro-meta-item {
  background: var(--c-night);
  padding: 24px 14px;
  text-align: center;
}
.page-about__intro-meta-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1.2;
  color: var(--c-green);
  margin-bottom: 8px;
}
.page-about__intro-meta-item span {
  color: var(--c-mist);
  font-size: var(--text-sm);
}
.page-about .prose a {
  color: var(--c-green);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.page-about .prose a:hover {
  color: var(--c-white);
}

/* ========== 发展里程碑 ========== */
.page-about__milestones {
  background: linear-gradient(180deg, var(--c-deep) 0%, var(--c-night) 50%, var(--c-deep) 100%);
  padding-top: 64px;
  padding-bottom: 64px;
}
.page-about__timeline {
  list-style: none;
  margin: 44px auto 0;
  padding: 0;
  max-width: 860px;
  position: relative;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-green), var(--c-cyan), var(--c-orange));
  opacity: 0.75;
}
.page-about__timeline-item {
  position: relative;
  padding: 0 0 42px 38px;
}
.page-about__timeline-item:last-child {
  padding-bottom: 0;
}
.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--c-green);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.14);
}
.page-about__timeline-year {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--c-green);
  display: block;
  margin-bottom: 6px;
}
.page-about__timeline-body h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.page-about__timeline-body p {
  color: var(--c-mist);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin: 0;
  max-width: 40em;
}

/* ========== 资质与荣誉 ========== */
.page-about__credentials {
  padding-top: 64px;
  padding-bottom: 64px;
}
.page-about__credential-card {
  background: var(--c-night);
  border: 1px solid var(--c-line);
  padding: 28px 24px;
  clip-path: var(--sharp-corner);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.page-about__credential-card .tag {
  display: inline-block;
  margin-bottom: 14px;
}
.page-about__credential-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin: 0 0 10px;
  line-height: 1.32;
}
.page-about__credential-card p {
  color: var(--c-mist);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin: 0;
}
@media (hover: hover) {
  .page-about__credential-card:hover {
    transform: translateY(-4px);
    border-color: var(--c-green);
  }
}

/* ========== 数据能力 ========== */
.page-about__data {
  background: var(--c-ink);
  padding-top: 64px;
  padding-bottom: 64px;
  position: relative;
  overflow: hidden;
}
.page-about__data::before {
  content: "";
  position: absolute;
  top: -140px;
  left: -140px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 210, 255, 0.14), transparent 70%);
  pointer-events: none;
}
.page-about__data-layout {
  display: grid;
  gap: 36px;
  margin-top: 32px;
  position: relative;
  z-index: 1;
}
.page-about__data-figure {
  margin: 0;
}
.page-about__data-panel {
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.page-about__data-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about__data-stat-grid .data-stat {
  background: var(--c-deep);
  padding: 24px 20px;
}
.page-about__data-stat-grid .data-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-green);
}
.page-about__data-stat-grid .data-stat__label {
  display: block;
  color: var(--c-mist);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin-top: 8px;
}
.page-about__data-note {
  margin: 0;
  padding: 16px 18px;
  border-left: 3px solid var(--c-orange);
  background: rgba(255, 107, 0, 0.08);
  color: var(--c-mist);
  font-size: var(--text-sm);
  line-height: 1.75;
}

/* ========== 合作生态 ========== */
.page-about__ecosystem {
  padding-top: 64px;
  padding-bottom: 64px;
}
.page-about__eco-grid {
  display: grid;
  gap: 36px;
  margin-top: 32px;
  align-items: center;
}
.page-about__eco-figure {
  margin: 0;
}

/* ========== 共享媒体框架增强 ========== */
.page-about .media-frame__placeholder {
  clip-path: var(--sharp-corner);
  background: var(--c-night);
  border: 1px solid var(--c-line);
  overflow: hidden;
}
.page-about .media-frame__placeholder img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ========== 尾部导航 ========== */
.page-about__next {
  padding-top: 56px;
  padding-bottom: 72px;
}
.page-about__next-card {
  background: linear-gradient(135deg, var(--c-night) 0%, var(--c-deep) 60%);
  border: 1px solid var(--c-line);
  clip-path: var(--sharp-corner);
  padding: 44px 28px;
  text-align: center;
}
.page-about__next-card .section-title {
  font-size: var(--text-2xl);
  margin-bottom: 10px;
}
.page-about__next-card p {
  color: var(--c-mist);
  font-size: var(--text-base);
  margin: 0;
}
.page-about__next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 26px;
}

/* ========== 桌面端布局 ========== */
@media (min-width: 900px) {
  .page-about__cover {
    padding: 48px 0 32px;
  }
  .page-about__cover-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
    gap: 48px;
  }
  .page-about__cover-figure {
    order: 1;
  }
  .page-about__cover-copy {
    order: 2;
  }
  .page-about__cover-title {
    font-size: var(--text-hero);
    max-width: 8em;
  }
  .page-about__cover-lede {
    font-size: var(--text-lg);
  }
  .page-about__cover-strip {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__intro-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
  .page-about__intro-meta {
    grid-template-columns: 1fr;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }
  .page-about__timeline-item {
    width: 50%;
    padding: 0 48px 48px 0;
  }
  .page-about__timeline-item::before {
    left: auto;
    right: -6px;
  }
  .page-about__timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 48px 48px;
  }
  .page-about__timeline-item:nth-child(even)::before {
    right: auto;
    left: -6px;
  }
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-year {
    text-align: right;
  }
  .page-about__timeline-body {
    max-width: 30em;
  }
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-body h3,
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-body p {
    text-align: right;
    margin-left: auto;
  }

  .page-about__data-layout {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }
  .page-about__data-stat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__data-stat-grid .data-stat {
    padding: 26px 22px;
  }

  .page-about__eco-grid {
    grid-template-columns: 6fr 7fr;
  }
}