.page-about {
  position: relative;
  isolation: isolate;
  background: var(--sf-navy);
  color: var(--sf-silver);
  font-family: var(--sf-font-body);
  overflow-x: hidden;
}

.page-about::before {
  content: "顺发赛场";
  position: fixed;
  top: 22vh;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: clamp(8rem, 30vw, 26rem);
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 237, 255, 0.055);
  pointer-events: none;
  z-index: -1;
}

.page-about .story-cover {
  position: relative;
  padding: calc(var(--sf-topline-h) + 3rem) 0 clamp(2.5rem, 6vw, 5rem);
  background:
    radial-gradient(1100px 460px at 82% 8%, rgba(0, 255, 148, 0.1), transparent 60%),
    radial-gradient(800px 360px at 12% 92%, rgba(0, 212, 255, 0.12), transparent 55%),
    linear-gradient(135deg, var(--sf-ink) 0%, var(--sf-navy) 55%, var(--sf-blue) 130%);
  overflow: hidden;
}

.page-about .story-cover::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sf-green) 0%, var(--sf-ice) 40%, transparent 100%);
  z-index: 2;
}

.page-about .story-cover::after {
  content: "";
  position: absolute;
  top: 0;
  right: -6%;
  bottom: 0;
  width: 30%;
  transform: skewX(-12deg);
  background: linear-gradient(180deg, rgba(255, 87, 34, 0.14), transparent 65%);
  pointer-events: none;
}

.page-about .story-cover__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sf-gap);
}

.page-about .story-cover__rail {
  position: absolute;
  top: 0.75rem;
  right: 0.5rem;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(3.2rem, 12vw, 5.5rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: rgba(232, 237, 255, 0.12);
  -webkit-text-stroke: 1px rgba(232, 237, 255, 0.22);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .story-cover__content {
  position: relative;
  z-index: 1;
}

.page-about .story-cover__title {
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 5.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 15ch;
  text-wrap: balance;
}

.page-about .story-cover__title .title-hit {
  color: var(--sf-green);
}

.page-about .story-cover__lead {
  max-width: 62ch;
  margin-bottom: 2rem;
}

.page-about .story-cover__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sf-gap);
}

.page-about .story-cover__media {
  position: relative;
  border-radius: var(--sf-radius);
  overflow: hidden;
  transform: rotate(-1deg);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.42);
}

.page-about .story-cover__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 255, 148, 0.1), transparent 40%);
  pointer-events: none;
}

.page-about .story-cover__media img,
.page-about .capability__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .story-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about .story-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-height: 6.5rem;
  justify-content: center;
}

.page-about .story-stat__num {
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  line-height: 1.1;
  color: var(--sf-green);
}

.page-about .story-stat__label {
  font-size: 0.8rem;
  color: var(--sf-muted);
  letter-spacing: 0.02em;
}

.page-about .chapter-head {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .chapter-head__no {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(4.5rem, 10vw, 8rem);
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 237, 255, 0.08);
  pointer-events: none;
  line-height: 1;
  z-index: 0;
}

.page-about .chapter-head .sf-eyebrow,
.page-about .chapter-head .sf-title {
  position: relative;
  z-index: 1;
}

.page-about .chapter-head .sf-title,
.page-about .capability__head .sf-title {
  margin: 0;
  max-width: 22ch;
}

.page-about .intro-chapter {
  margin-block: clamp(3rem, 6vw, 5.5rem);
}

.page-about .intro-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .intro-chapter__text p {
  color: var(--sf-muted);
  line-height: 1.85;
  max-width: 58ch;
  margin: 0 0 1.25rem;
}

.page-about .version-card {
  padding: 1.75rem;
  border-radius: var(--sf-radius);
  background: linear-gradient(135deg, rgba(30, 42, 90, 0.75), rgba(11, 18, 32, 0.7));
  border: 1px solid var(--sf-border);
  backdrop-filter: blur(8px);
  display: grid;
  gap: 0.35rem;
}

.page-about .version-card__label {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sf-orange);
  font-family: var(--sf-font-body);
  font-weight: 700;
}

.page-about .version-card__value {
  margin: 0;
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(2.8rem, 6vw, 5rem);
  color: var(--sf-green);
  line-height: 1;
}

.page-about .version-card__desc {
  margin: 0;
  font-size: 0.85rem;
  color: var(--sf-silver);
}

.page-about .intro-chapter__note {
  margin: 1rem 0 0;
  font-size: 0.82rem;
  color: var(--sf-fog);
}

.page-about .milestones {
  margin-block: clamp(3rem, 6vw, 5.5rem);
}

.page-about .milestones__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
}

.page-about .milestones__sticky {
  position: relative;
  border-left: 1px solid var(--sf-border);
  padding-left: 1.25rem;
}

.page-about .milestones__sticky-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: 0.8rem;
  letter-spacing: 0.26em;
  color: var(--sf-green);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.page-about .milestones__sticky-kicker::after {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: var(--sf-border);
}

.page-about .milestones__sticky p {
  margin: 0 0 1rem;
  color: var(--sf-muted);
  line-height: 1.75;
  font-size: 0.92rem;
}

.page-about .milestones__sticky-meta {
  font-family: var(--sf-font-title);
  font-size: 0.82rem;
  color: var(--sf-orange);
  letter-spacing: 0.06em;
}

.page-about .milestones__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  border-left: 1px solid var(--sf-border);
  padding-left: 1.25rem;
  display: grid;
  gap: 1.75rem;
}

.page-about .milestone-item {
  position: relative;
}

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: -1.7188rem;
  top: 0.5rem;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--sf-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 148, 0.14);
}

.page-about .milestone-item__year {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sf-font-title);
  font-weight: 900;
  color: var(--sf-green);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  margin-bottom: 0.5rem;
}

.page-about .milestone-item__year::after {
  content: "";
  width: 3rem;
  height: 1px;
  background: var(--sf-border);
}

.page-about .milestone-item__card h3 {
  font-family: var(--sf-font-title);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.page-about .milestone-item__card p {
  margin: 0;
  color: var(--sf-muted);
  line-height: 1.75;
}

.page-about .capability {
  margin-block: clamp(3rem, 6vw, 5.5rem);
}

.page-about .capability__head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.page-about .capability__head .chapter-head {
  margin-bottom: 0;
}

.page-about .capability__lead {
  max-width: 52ch;
  margin: 0;
  color: var(--sf-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

.page-about .capability__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 2.5vw, 2rem);
  margin-bottom: 2rem;
}

.page-about .capability__panel {
  padding: 1.25rem;
}

.page-about .capability__panel-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--sf-fog);
  border-bottom: 1px solid var(--sf-border);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  letter-spacing: 0.06em;
}

.page-about .data-network {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .data-network__links {
  stroke: rgba(0, 212, 255, 0.22);
  stroke-width: 1.5;
  stroke-dasharray: 4 6;
}

.page-about .data-node__dot {
  fill: var(--sf-navy);
  stroke: var(--sf-green);
  stroke-width: 2.5;
  transition: stroke-width 180ms cubic-bezier(.4, 0, .2, 1), filter 180ms cubic-bezier(.4, 0, .2, 1);
}

.page-about .data-node__halo {
  fill: none;
  stroke: rgba(0, 255, 148, 0.12);
  stroke-width: 6;
  transition: stroke-width 180ms cubic-bezier(.4, 0, .2, 1), opacity 180ms cubic-bezier(.4, 0, .2, 1);
}

.page-about .data-node-group:hover .data-node__dot,
.page-about .data-node-group:focus-within .data-node__dot {
  stroke-width: 3.5;
  filter: drop-shadow(0 0 8px rgba(0, 255, 148, 0.8));
}

.page-about .data-node-group:hover .data-node__halo,
.page-about .data-node-group:focus-within .data-node__halo {
  stroke-width: 2;
  opacity: 0.9;
}

.page-about .data-node__name {
  fill: var(--sf-silver);
  font-family: var(--sf-font-body);
  font-size: 13px;
  font-weight: 700;
}

.page-about .data-node__meta {
  fill: rgba(0, 255, 148, 0.95);
  font-family: var(--sf-font-body);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0;
  transition: opacity 180ms cubic-bezier(.4, 0, .2, 1);
}

.page-about .data-node-group:hover .data-node__meta,
.page-about .data-node-group:focus-within .data-node__meta {
  opacity: 1;
}

.page-about .capability__panel-note {
  margin: 0.75rem 0 0;
  font-size: 0.75rem;
  color: var(--sf-fog);
  text-align: center;
}

.page-about .capability__stack {
  display: grid;
  gap: 1.25rem;
}

.page-about .capability__media {
  aspect-ratio: 7 / 4;
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: var(--sf-blue);
}

.page-about .capability__pipeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .pipeline-item {
  background: rgba(27, 40, 84, 0.52);
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius);
  padding: 1rem 1.1rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
}

.page-about .pipeline-item__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgba(0, 255, 148, 0.12);
  color: var(--sf-green);
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: 0.85rem;
}

.page-about .pipeline-item p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--sf-muted);
  line-height: 1.55;
}

.page-about .pipeline-item strong {
  color: var(--sf-silver);
}

.page-about .capability__metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about .security {
  position: relative;
  padding: clamp(3rem, 6vw, 5rem) 0;
  overflow: hidden;
  background: var(--sf-ink);
  margin-block: clamp(2rem, 5vw, 4rem);
}

.page-about .security__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .security__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 8, 15, 0.78) 0%, rgba(11, 18, 32, 0.88) 100%);
}

.page-about .security__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7);
}

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

.page-about .security__lead {
  max-width: 72ch;
  margin: 0;
  color: var(--sf-muted);
  line-height: 1.85;
  font-size: 0.95rem;
}

.page-about .security__wall {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin: 2.5rem 0 0;
  padding: 0;
}

.page-about .badge-card {
  position: relative;
  background: rgba(5, 8, 15, 0.55);
  border: 1px solid rgba(232, 237, 255, 0.16);
  border-radius: var(--sf-radius);
  min-height: 10rem;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 0.25rem;
  padding: 1.5rem 1rem 2rem;
  backdrop-filter: blur(8px);
  transition: transform 180ms cubic-bezier(.4, 0, .2, 1), border-color 180ms cubic-bezier(.4, 0, .2, 1);
  text-align: center;
}

.page-about .badge-card:hover,
.page-about .badge-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(0, 255, 148, 0.55);
}

.page-about .badge-card__code {
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: 0.82rem;
  letter-spacing: 0.35em;
  color: var(--sf-orange);
}

.page-about .badge-card__name {
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  color: var(--sf-silver);
  line-height: 1;
}

.page-about .badge-card__tip {
  position: absolute;
  bottom: -1.1rem;
  left: 50%;
  transform: translate(-50%, 8px);
  background: var(--sf-ink);
  border: 1px solid var(--sf-green);
  color: var(--sf-silver);
  font-size: 0.78rem;
  line-height: 1.4;
  white-space: nowrap;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms cubic-bezier(.4, 0, .2, 1), transform 180ms cubic-bezier(.4, 0, .2, 1);
  z-index: 2;
}

.page-about .badge-card:hover .badge-card__tip,
.page-about .badge-card:focus-within .badge-card__tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .vision {
  position: relative;
  padding: clamp(3rem, 7vw, 6rem) 0;
  text-align: center;
  overflow: hidden;
  background: radial-gradient(920px 420px at 50% 120%, rgba(0, 255, 148, 0.1), transparent 60%);
  margin-block: clamp(2rem, 5vw, 4rem);
}

.page-about .vision__giant {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--sf-font-title);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(4rem, 14vw, 12rem);
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 237, 255, 0.08);
  letter-spacing: -0.02em;
  pointer-events: none;
  text-align: center;
  white-space: nowrap;
}

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

.page-about .vision__body {
  max-width: 56rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.page-about .vision__body .chapter-head {
  align-items: center;
  margin-bottom: 0;
}

.page-about .vision__body .chapter-head .sf-title {
  text-align: center;
  max-width: 30ch;
  margin-inline: auto;
}

.page-about .vision__lead {
  max-width: 58ch;
  margin: 0 auto;
  color: var(--sf-silver);
  line-height: 1.85;
  font-size: 0.98rem;
}

.page-about .vision__list {
  list-style: none;
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  text-align: left;
}

.page-about .vision__list li {
  padding-left: 1.25rem;
  position: relative;
  color: var(--sf-silver);
  line-height: 1.6;
  font-size: 0.95rem;
}

.page-about .vision__list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--sf-green);
}

.page-about .vision__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.75rem;
}

.page-about .vision__more {
  margin: 0;
  font-size: 0.85rem;
  color: var(--sf-fog);
}

.page-about .vision__more a {
  color: var(--sf-green);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

@media (min-width: 640px) {
  .page-about .story-cover__stats {
    gap: 1rem;
  }

  .page-about .capability__pipeline,
  .page-about .security__wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .story-cover__split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: stretch;
  }

  .page-about .intro-chapter__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .milestone-item:nth-child(even) {
    margin-left: clamp(0.5rem, 6vw, 4rem);
  }
}

@media (min-width: 1024px) {
  .page-about .story-cover__grid {
    grid-template-columns: minmax(7rem, 0.22fr) minmax(0, 1fr);
    gap: clamp(1rem, 2vw, 2.5rem);
  }

  .page-about .story-cover__rail {
    position: sticky;
    top: 6rem;
    align-self: start;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    height: calc(100vh - 10rem);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    font-size: clamp(4rem, 8vw, 7rem);
    letter-spacing: 0.04em;
  }

  .page-about .milestones__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3rem;
  }

  .page-about .milestones__sticky {
    position: sticky;
    top: 6rem;
    align-self: start;
    border-left: 2px solid var(--sf-green);
    padding-left: 1.75rem;
    margin-top: 0.5rem;
  }

  .page-about .capability__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 3rem;
  }

  .page-about .capability__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .security__wall {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1rem, 2vw, 1.5rem);
  }
}