.page-about {
  --about-grid: rgba(192, 192, 192, 0.07);
  --about-card: rgba(30, 58, 95, 0.32);
  --about-glow: rgba(255, 107, 53, 0.16);
  position: relative;
  background-color: var(--navy-900);
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--white);
  overflow: hidden;
}

/* ── 面包屑 ── */
.page-about__crumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.25rem var(--space) 0;
}
.page-about__crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.75rem;
  padding: 0;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
}
.page-about__crumb a {
  color: var(--silver);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}
.page-about__crumb a:hover,
.page-about__crumb a:focus-visible {
  color: var(--accent);
  outline: none;
}
.page-about__crumb li + li::before {
  content: "/";
  margin-right: 0.75rem;
  color: var(--silver);
  opacity: 0.45;
}

/* ── HERO ── */
.page-about__hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(2.2rem, 5vw, 4.5rem) var(--space) 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.75rem;
  align-items: center;
  position: relative;
}
.page-about__kicker,
.page-about__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin: 0 0 0.9rem;
}
.page-about__hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 3rem);
  line-height: 1.18;
  margin: 0 0 1.1rem;
  letter-spacing: 0.01em;
}
.page-about__hero-lead {
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--dim);
  max-width: 34em;
  margin: 0 0 1.8rem;
}
.page-about__hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 1.6rem;
  align-items: center;
}
.page-about__linkline {
  color: var(--silver);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(192, 192, 192, 0.4);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about__linkline:hover,
.page-about__linkline:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  outline: none;
}
.page-about__hero-frame {
  position: relative;
}

/* 终端框景 */
.page-about__terminal {
  background: rgba(11, 27, 61, 0.85);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(6px);
  transform: rotate(0.6deg);
}
.page-about__terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--panel-border);
}
.page-about__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(192, 192, 192, 0.28);
}
.page-about__dot--on {
  background: var(--accent);
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.7);
}
.page-about__terminal-tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--dim);
}
.page-about__terminal-body {
  padding: 1.6rem 1.5rem 1.4rem;
}
.page-about__coord {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--silver);
  letter-spacing: 0.08em;
  margin: 0 0 1.4rem;
}
.page-about__terminal-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.8rem, 6vw, 4rem);
  line-height: 1;
  color: var(--white);
  letter-spacing: 0.02em;
}
.page-about__terminal-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  margin-top: 0.55rem;
}
.page-about__terminal-gauge {
  position: relative;
  height: 4px;
  background: rgba(192, 192, 192, 0.15);
  border-radius: 99px;
  margin: 1.4rem 0 1.1rem;
  overflow: hidden;
}
.page-about__terminal-gauge span {
  display: block;
  width: 72%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #ff9a6b);
}
.page-about__terminal-foot {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--silver);
}
.page-about__terminal-foot::before {
  content: "";
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 90px;
  height: 90px;
  background: radial-gradient(circle, var(--about-glow), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* ── 八年沉淀 ── */
.page-about__story {
  max-width: var(--container);
  margin: 0 auto;
  padding: 3rem var(--space) 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.4rem;
}
.page-about__story-copy h2,
.page-about__section-head h2,
.page-about__tech-copy h2,
.page-about__team-copy h2,
.page-about__honor-main h2,
.page-about__cta h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 1.1rem;
}
.page-about__story-copy p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--dim);
  margin: 0 0 1rem;
}
.page-about__story-copy p:first-of-type {
  color: var(--white);
  font-size: 1.05rem;
}
.page-about__story-index {
  position: relative;
  background: var(--about-card);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 1.8rem 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
  overflow: hidden;
}
.page-about__story-index::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 130px;
  height: 130px;
  border: 1px solid rgba(255, 107, 53, 0.3);
  transform: rotate(45deg);
  pointer-events: none;
}
.page-about__story-year {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.page-about__story-slogan {
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.5;
  color: var(--white);
  letter-spacing: 0.05em;
}
.page-about__story-record {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--dim);
}

/* ── 关键数字 ── */
.page-about__stats-sec {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--space) 4rem;
}
.page-about__section-head {
  margin-bottom: 1.8rem;
}
.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.page-about__stat {
  background: var(--about-card);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  min-height: 120px;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.page-about__stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.25);
}
.page-about__stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--white);
}
.page-about__stat-label {
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--dim);
}
.page-about__stat--big {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(30, 58, 95, 0.55), rgba(11, 27, 61, 0.85));
}
.page-about__stat--big .page-about__stat-num {
  font-size: clamp(2.3rem, 6vw, 3.6rem);
  color: var(--accent);
}
.page-about__stat--accent {
  border-color: rgba(255, 107, 53, 0.4);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.14), rgba(30, 58, 95, 0.28));
}
.page-about__stat--accent .page-about__stat-num {
  color: var(--accent);
}

/* ── 时间线 ── */
.page-about__timeline-sec {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--space) 4rem;
  position: relative;
}
.page-about__timeline {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2.4rem;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--accent),
    rgba(255, 107, 53, 0.35) 30%,
    rgba(192, 192, 192, 0.28) 70%,
    rgba(192, 192, 192, 0.08)
  );
}
.page-about__timeline-item {
  position: relative;
  padding: 0 0 2.2rem;
}
.page-about__timeline-item:last-child {
  padding-bottom: 0;
}
.page-about__tl-dot {
  position: absolute;
  left: -2rem;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--navy-800);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.45), 0 0 16px rgba(255, 107, 53, 0.35);
  transition: transform 0.2s ease;
}
.page-about__timeline-item:hover .page-about__tl-dot,
.page-about__timeline-item:focus-within .page-about__tl-dot {
  transform: scale(1.2);
}
.page-about__tl-card {
  background: rgba(11, 27, 61, 0.72);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 1.25rem 1.35rem;
  transition: background 0.22s ease, border-color 0.22s ease;
}
.page-about__timeline-item:hover .page-about__tl-card {
  background: rgba(30, 58, 95, 0.48);
  border-color: rgba(255, 107, 53, 0.35);
}
.page-about__tl-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.45rem;
}
.page-about__tl-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--white);
}
.page-about__tl-card p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--dim);
  margin: 0;
}
.page-about__tl-visual {
  margin-top: 1.5rem;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  aspect-ratio: 16 / 10;
  background: var(--navy-800);
}
.page-about__tl-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ── 技术架构 ── */
.page-about__tech {
  max-width: var(--container);
  margin: 0 auto;
  padding: 3rem var(--space) 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
}
.page-about__tech-imgwrap {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  aspect-ratio: 3 / 2;
  background: var(--navy-800);
}
.page-about__tech-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about__tech-copy h2 {
  margin-bottom: 1.4rem;
}
.page-about__tech-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}
.page-about__tech-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--about-card);
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about__tech-list li:hover {
  border-color: rgba(255, 107, 53, 0.4);
  transform: translateX(4px);
}
.page-about__tech-idx {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  padding-top: 0.18rem;
}
.page-about__tech-list strong {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  display: block;
  margin-bottom: 0.3rem;
}
.page-about__tech-list p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--dim);
  margin: 0;
}

/* ── 产品状态速览 ── */
.page-about__status {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem var(--space) 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}
.page-about__status-item {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  background: rgba(11, 27, 61, 0.72);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
}
.page-about__status-mark {
  color: var(--success);
  font-size: 0.85rem;
  line-height: 1.6;
}
.page-about__status-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--dim);
}

/* ── 团队分工 ── */
.page-about__team {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--space) 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.4rem;
}
.page-about__team-img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--panel-border);
  margin-top: 1.4rem;
  object-fit: cover;
}
.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about__team-card {
  background: var(--about-card);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 1.5rem 1.3rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.page-about__team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}
.page-about__team-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.3);
}
.page-about__team-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.8rem;
}
.page-about__team-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: var(--white);
}
.page-about__team-card p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--dim);
  margin: 0;
}

/* ── 荣誉与认可 ── */
.page-about__honor {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--space) 4rem;
}
.page-about__honor-main {
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.12), rgba(11, 27, 61, 0.55)),
    var(--navy-800);
  border: 1px solid rgba(255, 107, 53, 0.28);
  border-radius: 22px;
  padding: 2rem 1.6rem;
}
.page-about__honor-badge {
  display: flex;
  gap: 1.3rem;
  align-items: flex-start;
  margin: 1.6rem 0 2rem;
}
.page-about__honor-year {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  white-space: nowrap;
}
.page-about__honor-badge h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  color: var(--white);
}
.page-about__honor-badge p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--dim);
  margin: 0;
}
.page-about__honor-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  border-top: 1px solid var(--panel-border);
  padding-top: 1.4rem;
}
.page-about__honor-metrics div {
  text-align: left;
}
.page-about__honor-metrics span {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  display: block;
  line-height: 1.15;
}
.page-about__honor-metrics small {
  font-size: 0.76rem;
  color: var(--dim);
  line-height: 1.5;
}

/* ── CTA ── */
.page-about__cta {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--space) 5rem;
  text-align: center;
}
.page-about__cta h2 {
  margin-bottom: 0.8rem;
}
.page-about__cta-copy {
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--dim);
  max-width: 44em;
  margin: 0 auto 1.7rem;
}
.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 1.8rem;
  justify-content: center;
  align-items: center;
}

/* ── 中等屏（≥600px） ── */
@media (min-width: 600px) {
  .page-about__stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__stat--big {
    grid-column: span 2;
  }
  .page-about__status {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__team-card:last-child {
    grid-column: span 2;
  }
  .page-about__honor-metrics {
    gap: 1.5rem;
  }
}

/* ── 桌面（≥900px） ── */
@media (min-width: 900px) {
  .page-about__hero {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
  }
  .page-about__story {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    padding-top: 4.5rem;
    padding-bottom: 5rem;
  }
  .page-about__stats-sec {
    padding-top: 2.5rem;
  }
  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about__stat--big {
    grid-row: span 2;
    grid-column: span 1;
  }
  .page-about__stat--accent {
    grid-column: span 2;
  }
  .page-about__timeline-sec {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: start;
  }
  .page-about__section-head {
    grid-column: 1 / -1;
  }
  .page-about__tl-visual {
    margin-top: 0;
    align-self: stretch;
    aspect-ratio: auto;
    min-height: 520px;
  }
  .page-about__tech {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 3.5rem;
    align-items: center;
  }
  .page-about__team {
    grid-template-columns: 0.75fr 1.25fr;
    gap: 3rem;
    align-items: start;
  }
  .page-about__team-copy h2 {
    margin-bottom: 0.4rem;
  }
  .page-about__team-img {
    max-width: 360px;
  }
  .page-about__team-grid {
    align-content: start;
  }
  .page-about__honor-main {
    padding: 2.6rem 2.4rem;
  }
  .page-about__honor-metrics {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ── 大屏（≥1200px） ── */
@media (min-width: 1200px) {
  .page-about__team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__team-card:last-child {
    grid-column: span 1;
  }
}