.page-about {
  --about-num-color: rgba(57, 255, 20, 0.14);
  --about-line: #3a5f8a;
  --about-accent: #39ff14;
  --about-orange: #ff6b2b;
  --about-paper: #f2f5f8;
  --about-bg: #0a1428;
  --about-card: #0f1f3a;
  --about-muted: #8a9ba8;
  font-family: var(--font-body);
  color: var(--c-body);
  background:
    linear-gradient(135deg, rgba(62, 95, 138, 0.08) 25%, transparent 25%) 0 0 / 32px 32px,
    radial-gradient(circle at 82% 18%, rgba(57, 255, 20, 0.05), transparent 22%),
    var(--about-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: 24px;
  padding-bottom: 12px;
  font-size: 0.9rem;
  color: var(--c-gray);
}

.page-about .breadcrumb a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--c-neon);
  color: var(--c-paper);
}

.page-about .section-label {
  margin-bottom: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-neon);
}

.page-about .section-title,
.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--c-paper);
  line-height: 1.12;
  letter-spacing: 0.01em;
}

.page-about .section-intro {
  margin-top: 12px;
  max-width: 640px;
  color: var(--c-gray);
  font-size: 1.04rem;
}

/* 首屏 */
.page-about .pg-hero {
  position: relative;
  padding: 48px 0 72px;
  border-top: 1px solid var(--c-space-300);
  border-bottom: 1px solid var(--c-space-300);
}

.page-about .pg-hero::before {
  content: "08";
  position: absolute;
  right: 2vw;
  top: 24px;
  font-family: var(--font-display);
  font-size: clamp(5rem, 12vw, 11rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(58, 95, 138, 0.55);
  z-index: 0;
  pointer-events: none;
}

.page-about .pg-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .pg-hero__title {
  max-width: 9ch;
  margin: 0 0 20px;
  font-size: clamp(2.4rem, 7vw, 5.6rem);
  text-transform: uppercase;
}

.page-about .pg-hero__intro {
  max-width: 720px;
  margin: 0 0 28px;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--c-paper);
  padding-left: 18px;
  border-left: 4px solid var(--c-neon);
}

.page-about .pg-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .tag {
  display: inline-block;
  background: rgba(255, 107, 43, 0.12);
  color: var(--c-orange);
  border: 1px solid var(--c-orange);
  padding: 5px 12px;
  font-size: 0.83rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .tag:hover {
  background: rgba(255, 107, 43, 0.24);
  color: var(--c-paper);
}

/* 使命章节 */
.page-about .pg-mission {
  padding: 80px 0;
}

.page-about .pg-mission__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .pg-mission h2 {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  margin-bottom: 18px;
}

.page-about .text-block p {
  margin-bottom: 1rem;
  font-size: 1rem;
  color: var(--c-body);
}

.page-about .pg-mission__facts {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  grid-template-columns: repeat(3, 1fr);
}

.page-about .pg-mission__fact {
  background: var(--c-space-700);
  border: 1px solid var(--c-space-300);
  padding: 18px 14px;
  text-align: center;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .pg-mission__fact:hover,
.page-about .pg-mission__fact:focus-within {
  border-color: var(--c-neon);
  transform: translateY(-3px);
}

.page-about .pg-mission__num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--c-neon);
  display: block;
  line-height: 1;
}

.page-about .pg-mission__note {
  display: block;
  margin-top: 8px;
  font-size: 0.84rem;
  color: var(--c-gray);
  letter-spacing: 0.06em;
}

.page-about .pg-mission__visual {
  max-width: 800px;
  margin-inline: auto;
}

.page-about .pg-mission__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-space-300);
  clip-path: polygon(0 0, 96% 0, 100% 6%, 100% 100%, 0 100%);
}

/* V4板块 */
.page-about .pg-v4 {
  padding: 0 0 80px;
}

.page-about .pg-v4__frame {
  position: relative;
  background: var(--c-space-700);
  border: 1px solid var(--c-space-300);
  display: grid;
  gap: 36px;
  padding: 36px 24px;
}

.page-about .pg-v4__frame::before {
  content: "V4";
  position: absolute;
  right: 12px;
  bottom: -10px;
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 8rem);
  color: transparent;
  -webkit-text-stroke: 1px rgba(57, 255, 20, 0.4);
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

.page-about .pg-v4__copy,
.page-about .pg-v4__visual {
  position: relative;
  z-index: 1;
}

.page-about .pg-v4 h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.8rem);
  margin-bottom: 16px;
}

.page-about .pg-v4 .text-block p {
  font-size: 0.98rem;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .btn-neon {
  background: var(--c-neon);
  color: #06120a;
  border-color: var(--c-neon);
}

.page-about .btn-neon:hover,
.page-about .btn-neon:focus-visible {
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.4);
  background: #63ff47;
  color: #06120a;
}

.page-about .btn-ghost {
  background: transparent;
  color: var(--c-paper);
  border-color: var(--c-space-300);
}

.page-about .btn-ghost:hover,
.page-about .btn-ghost:focus-visible {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.page-about .pg-v4__visual {
  display: grid;
  gap: 18px;
}

.page-about .pg-v4__diagram {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
  text-align: center;
}

.page-about .pg-v4__step {
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  min-width: 180px;
  background: var(--c-space-500);
  border: 1px solid var(--c-space-300);
}

.page-about .pg-v4__step strong {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--c-paper);
}

.page-about .pg-v4__step span:last-child {
  font-size: 0.88rem;
  color: var(--c-gray);
}

.page-about .pg-v4__badge {
  background: var(--c-orange);
  color: #0a1428;
  padding: 2px 10px;
  width: fit-content;
  margin-inline: auto;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.page-about .pg-v4__step--neon {
  border-color: var(--c-neon);
}

.page-about .pg-v4__step--neon .pg-v4__badge {
  background: var(--c-neon);
}

.page-about .pg-v4__arrow {
  color: var(--c-neon);
  transform: rotate(90deg);
}

.page-about .pg-v4__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-space-300);
  filter: saturate(0.85);
}

.page-about .pg-v4__link {
  justify-self: start;
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--c-neon);
  padding-bottom: 2px;
  font-size: 0.94rem;
}

.page-about .pg-v4__link:hover {
  color: var(--c-paper);
  border-bottom-color: var(--c-paper);
}

/* 里程碑 / 时间线 */
.page-about .pg-milestones {
  background: linear-gradient(180deg, rgba(15, 31, 58, 0.84), rgba(10, 20, 40, 0.92)), url("{zhanqunpic:h:600w:1200}") center / cover no-repeat;
  padding: 88px 0 96px;
  border-top: 1px solid var(--c-space-300);
  border-bottom: 1px solid var(--c-space-300);
}

.page-about .pg-milestones h2 {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  margin-bottom: 12px;
}

.page-about .pg-milestones .section-intro {
  color: var(--c-gray);
}

.page-about .pg-timeline {
  list-style: none;
  position: relative;
  margin: 52px 0 0;
  padding: 0;
  display: grid;
  gap: 40px;
}

.page-about .pg-timeline::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-space-300);
}

.page-about .pg-timeline__item {
  position: relative;
  padding-left: 56px;
  cursor: default;
  transition: background 0.2s ease;
}

.page-about .pg-timeline__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  width: 15px;
  height: 15px;
  background: var(--about-bg);
  border: 2px solid var(--c-gray);
  transform: rotate(45deg);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .pg-timeline__item:hover::before,
.page-about .pg-timeline__item:focus-visible::before,
.page-about .pg-timeline__item--current::before {
  background: var(--c-neon);
  border-color: var(--c-neon);
}

.page-about .pg-timeline__year {
  font-family: var(--font-display);
  font-size: 2.2rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-space-300);
  display: block;
  transition: -webkit-text-stroke-color 0.2s ease, color 0.2s ease;
  margin-bottom: 6px;
}

.page-about .pg-timeline__item:hover .pg-timeline__year,
.page-about .pg-timeline__item:focus-visible .pg-timeline__year,
.page-about .pg-timeline__item--current .pg-timeline__year {
  color: var(--c-neon);
  -webkit-text-stroke-color: transparent;
}

.page-about .pg-timeline__card {
  background: rgba(10, 20, 40, 0.72);
  border: 1px solid var(--c-space-300);
  padding: 18px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .pg-timeline__item:hover .pg-timeline__card,
.page-about .pg-timeline__item:focus-visible .pg-timeline__card,
.page-about .pg-timeline__item--current .pg-timeline__card {
  border-color: var(--c-neon);
  box-shadow: 8px 8px 0 rgba(57, 255, 20, 0.1);
}

.page-about .pg-timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--c-paper);
  margin: 0 0 8px;
}

.page-about .pg-timeline__card p {
  margin: 0;
  color: var(--c-gray);
  font-size: 0.95rem;
}

.page-about .pg-timeline__item--current .pg-timeline__year {
  color: var(--c-neon);
  -webkit-text-stroke-color: transparent;
}

/* 数据服务能力 */
.page-about .pg-capability {
  padding: 88px 0;
}

.page-about .pg-capability__head {
  margin-bottom: 40px;
}

.page-about .pg-capability h2 {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
}

.page-about .pg-capability__grid {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
  margin-bottom: 48px;
}

.page-about .pg-cap__item {
  position: relative;
  background: var(--about-card);
  border: 1px solid var(--c-space-300);
  padding: 30px 20px 24px;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .pg-cap__item:hover,
.page-about .pg-cap__item:focus-within {
  border-color: var(--c-neon);
  transform: translateY(-4px);
}

.page-about .pg-cap__item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 92%, rgba(57, 255, 20, 0.25) 92%);
  pointer-events: none;
}

.page-about .pg-cap__index {
  position: absolute;
  top: -12px;
  right: 8px;
  font-family: var(--font-display);
  font-size: 5rem;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-space-300);
  line-height: 1;
  pointer-events: none;
  transition: -webkit-text-stroke-color 0.2s ease;
}

.page-about .pg-cap__item:hover .pg-cap__index,
.page-about .pg-cap__item:focus-within .pg-cap__index {
  -webkit-text-stroke-color: rgba(57, 255, 20, 0.7);
}

.page-about .pg-cap__item h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--c-paper);
  margin: 0 0 12px;
}

.page-about .pg-cap__item p {
  margin: 0;
  color: var(--c-body);
  font-size: 0.96rem;
}

.page-about .pg-capability__media {
  position: relative;
  margin-bottom: 32px;
  border: 1px solid var(--c-space-300);
  background: linear-gradient(180deg, rgba(15, 31, 58, 0.7), rgba(10, 20, 40, 0.7));
}

.page-about .pg-capability__map {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.72;
}

.page-about .pg-capability__trend {
  position: absolute;
  right: 0;
  bottom: 12px;
  left: 0;
  width: 100%;
  height: 120px;
  pointer-events: none;
  mix-blend-mode: screen;
}

.page-about .pg-capability__caption {
  position: absolute;
  right: 12px;
  bottom: 8px;
  background: rgba(10, 20, 40, 0.82);
  padding: 6px 12px;
  font-size: 0.76rem;
  color: var(--c-neon);
  border-left: 2px solid var(--c-neon);
  margin: 0;
}

.page-about .pg-capability__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* 媒介查询 */
@media (min-width: 640px) {
  .page-about .pg-v4__diagram {
    flex-direction: row;
    justify-content: center;
  }

  .page-about .pg-v4__arrow {
    transform: none;
  }

  .page-about .pg-capability__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .pg-hero {
    padding: 84px 0 110px;
  }

  .page-about .pg-hero__title {
    max-width: 12ch;
  }

  .page-about .pg-mission__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
  }

  .page-about .pg-mission__facts {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .pg-v4__frame {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    padding: 48px;
  }

  .page-about .pg-timeline {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-left: 4px;
  }

  .page-about .pg-timeline::before {
    left: 28px;
  }

  .page-about .pg-timeline__item {
    display: grid;
    grid-template-columns: 150px minmax(0, 620px);
    gap: 42px;
    align-items: start;
    padding-left: 0;
  }

  .page-about .pg-timeline__item::before {
    left: 21px;
    top: 14px;
  }

  .page-about .pg-timeline__year {
    text-align: right;
    font-size: 2.8rem;
  }

  .page-about .pg-capability h2 {
    max-width: 12ch;
  }
}