.page-about {
  --about-radius: 24px;
  --about-gap: 1.5rem;
  position: relative;
  overflow-x: hidden;
  color: var(--emc-ice);
  background: var(--emc-night);
}

/* ---------- 面包屑 ---------- */
.page-about__crumb {
  padding-top: calc(var(--emc-header-h) + 1.5rem);
  padding-bottom: 0.5rem;
  font-size: 0.82rem;
  color: var(--emc-silver);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.page-about__crumb a {
  color: var(--emc-cyan);
  text-decoration: none;
  transition: letter-spacing 0.25s ease;
}
.page-about__crumb a:hover {
  letter-spacing: 0.04em;
  text-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
}

/* ---------- Hero ---------- */
.page-about__hero {
  position: relative;
  padding: 1.75rem 0 2.5rem;
}
.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.page-about__hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(closest-side, rgba(0, 240, 255, 0.18), transparent);
  pointer-events: none;
}
.page-about__hero-grid {
  position: relative;
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about__hero-copy h1 {
  font-family: var(--emc-font-title);
  font-size: clamp(2rem, 6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.01em;
  margin: 0.9rem 0 1.1rem;
  color: var(--emc-ice);
}
.page-about__hero-copy h1::after {
  content: "";
  display: block;
  width: 4.5rem;
  height: 4px;
  margin-top: 1.3rem;
  background: linear-gradient(90deg, var(--emc-cyan), var(--emc-red));
  border-radius: var(--emc-radius-pill);
}
.page-about__hero-lead {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--emc-silver);
  max-width: 34em;
  margin: 0 0 1.5rem;
}
.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.page-about__hero-figure {
  position: relative;
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid rgba(0, 240, 255, 0.35);
  box-shadow:
    0 0 0 6px rgba(0, 240, 255, 0.06),
    0 24px 60px rgba(0, 0, 0, 0.45);
  background: var(--emc-night);
}
.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
}

/* ---------- Hero 指标 ---------- */
.page-about__hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
  margin-top: 2.2rem;
}
.page-about__hero-stat {
  background: rgba(75, 63, 114, 0.35);
  border: 1px solid rgba(0, 240, 255, 0.18);
  border-radius: var(--emc-radius-md);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  backdrop-filter: blur(4px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.page-about__hero-stat:hover {
  border-color: rgba(0, 240, 255, 0.5);
  box-shadow: 0 0 22px rgba(0, 240, 255, 0.12);
}
.page-about__hero-stat-num {
  font-family: var(--emc-font-num);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--emc-cyan);
  letter-spacing: -0.02em;
}
.page-about__hero-stat-num small {
  font-size: 0.52em;
  font-weight: 400;
  color: var(--emc-silver);
  margin-left: 0.1em;
}
.page-about__hero-stat-label {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--emc-silver);
}

/* ---------- 章节目录 ---------- */
.page-about__chapter {
  position: sticky;
  top: calc(var(--emc-header-h) - 1px);
  z-index: 40;
  background: rgba(10, 20, 40, 0.85);
  backdrop-filter: blur(14px);
  border-top: 1px solid rgba(0, 240, 255, 0.16);
  border-bottom: 1px solid rgba(0, 240, 255, 0.12);
}
.page-about__chapter-inner {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about__chapter-inner::-webkit-scrollbar {
  display: none;
}
.page-about__chapter-label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--emc-silver);
  white-space: nowrap;
  margin-right: 0.6rem;
}
.page-about__chapter a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--emc-radius-pill);
  font-size: 0.8rem;
  color: var(--emc-ice);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: var(--emc-transition);
}
.page-about__chapter a:hover {
  border-color: rgba(0, 240, 255, 0.4);
  color: var(--emc-cyan);
  background: rgba(0, 240, 255, 0.08);
}
.page-about__chapter-idx {
  font-family: var(--emc-font-num);
  font-size: 0.64rem;
  color: var(--emc-cyan);
}

/* ---------- 通用区块标题 ---------- */
.page-about__section-head {
  margin-bottom: 2.2rem;
  padding-top: 3.2rem;
}
.page-about__section-head h2 {
  font-family: var(--emc-font-title);
  font-size: clamp(1.65rem, 3.4vw, 2.4rem);
  font-weight: 700;
  color: var(--emc-ice);
  margin: 0.55rem 0 0;
  position: relative;
  display: inline-block;
  letter-spacing: 0.02em;
}
.page-about__section-head h2::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--emc-red);
  border-radius: var(--emc-radius-pill);
}

/* ---------- 使命与常亮哲学 ---------- */
.page-about__mission {
  padding-bottom: 2.5rem;
  background: linear-gradient(180deg, transparent, rgba(75, 63, 114, 0.14));
}
.page-about__mission-grid {
  display: grid;
  gap: 2rem;
}
.page-about__mission-copy p {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--emc-ice);
  margin: 0 0 1.2rem;
  max-width: 38em;
}
.page-about__mission-copy p:last-child {
  margin-bottom: 0;
}
.page-about__mission-principles {
  display: grid;
  gap: 1rem;
}
.page-about__principle {
  background: rgba(10, 20, 40, 0.55);
  border: 1px solid rgba(192, 192, 192, 0.16);
  border-left: 3px solid var(--emc-cyan);
  border-radius: var(--emc-radius-md);
  padding: 1.2rem 1.3rem;
  transition: var(--emc-transition);
}
.page-about__principle:hover {
  border-left-color: var(--emc-red);
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.08);
  transform: translateX(4px);
}
.page-about__principle-num {
  font-family: var(--emc-font-num);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--emc-cyan);
  display: block;
  margin-bottom: 0.5rem;
}
.page-about__principle h3 {
  font-family: var(--emc-font-title);
  font-size: 1.18rem;
  letter-spacing: 0.03em;
  color: var(--emc-ice);
  margin: 0 0 0.45rem;
}
.page-about__principle p {
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--emc-silver);
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about__journey {
  padding-bottom: 2.5rem;
  border-top: 1px solid rgba(255, 42, 42, 0.16);
  border-bottom: 1px solid rgba(255, 42, 42, 0.16);
  background:
    radial-gradient(1200px 420px at 82% 0%, rgba(107, 29, 42, 0.4), transparent 62%),
    radial-gradient(600px 300px at 6% 100%, rgba(75, 63, 114, 0.25), transparent 60%);
}
.page-about__journey-intro {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2.4rem;
}
.page-about__journey-figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 42, 42, 0.3);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}
.page-about__journey-figure img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center;
}
.page-about__journey-note {
  margin: 0;
  color: var(--emc-ice);
  font-size: 0.98rem;
  line-height: 1.85;
  padding: 1.1rem 1.2rem;
  border-left: 3px solid var(--emc-red);
  background: rgba(107, 29, 42, 0.22);
  border-radius: 0 var(--emc-radius-md) var(--emc-radius-md) 0;
}

/* ---------- 时间轴 ---------- */
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}
.page-about__tl-item {
  position: relative;
}
.page-about__tl-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.page-about__tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--emc-cyan);
  box-shadow:
    0 0 0 4px rgba(0, 240, 255, 0.2),
    0 0 16px rgba(0, 240, 255, 0.6);
  flex-shrink: 0;
}
.page-about__tl-axis {
  height: 2px;
  flex: 1;
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.4), rgba(0, 240, 255, 0.05));
  border-radius: var(--emc-radius-pill);
}
.page-about__tl-card {
  background: rgba(10, 20, 40, 0.68);
  border: 1px solid rgba(192, 192, 192, 0.18);
  border-radius: var(--about-radius);
  padding: 1.3rem;
  transition: var(--emc-transition);
}
.page-about__tl-card:hover {
  border-color: rgba(0, 240, 255, 0.5);
  box-shadow: 0 0 26px rgba(0, 240, 255, 0.12);
  transform: translateY(-3px);
}
.page-about__tl-index {
  font-family: var(--emc-font-num);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--emc-red);
  display: block;
  margin-bottom: 0.45rem;
}
.page-about__tl-year {
  font-family: var(--emc-font-num);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--emc-cyan);
  display: block;
}
.page-about__tl-card h3 {
  font-family: var(--emc-font-title);
  font-size: 1.22rem;
  letter-spacing: 0.02em;
  color: var(--emc-ice);
  margin: 0.55rem 0 0.5rem;
}
.page-about__tl-card p {
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--emc-silver);
  margin: 0;
}

/* ---------- 数据与技术体系 ---------- */
.page-about__data {
  position: relative;
  padding-bottom: 2.5rem;
}
.page-about__data::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 85%);
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  pointer-events: none;
}
.page-about__data-layout {
  position: relative;
  display: grid;
  gap: 2rem;
}
.page-about__data-copy > p:first-child {
  color: var(--emc-ice);
  font-size: 0.98rem;
  line-height: 1.9;
  margin-top: 0;
  max-width: 36em;
}
.page-about__data-metrics {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}
.page-about__metric {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx value"
    "idx label";
  gap: 0.15rem 0.9rem;
  align-items: baseline;
  padding: 0.95rem 1rem;
  background: rgba(75, 63, 114, 0.22);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-radius: var(--emc-radius-md);
  transition: var(--emc-transition);
}
.page-about__metric:hover {
  border-color: rgba(0, 240, 255, 0.45);
  background: rgba(0, 240, 255, 0.05);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.08);
}
.page-about__metric-idx {
  grid-area: idx;
  font-family: var(--emc-font-num);
  font-size: 0.7rem;
  color: rgba(0, 240, 255, 0.7);
}
.page-about__metric-value {
  grid-area: value;
  font-family: var(--emc-font-num);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--emc-cyan);
  letter-spacing: -0.02em;
}
.page-about__metric-label {
  grid-area: label;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--emc-silver);
}
.page-about__data-note {
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--emc-silver);
  margin-top: 1.5rem;
  border-top: 1px dashed rgba(192, 192, 192, 0.25);
  padding-top: 1rem;
}
.page-about__data-figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid rgba(0, 240, 255, 0.28);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}
.page-about__data-figure img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  object-position: center;
}

/* ---------- 资质与生态合作 ---------- */
.page-about__qualification {
  position: relative;
  padding-bottom: 2.5rem;
  border-top: 1px solid rgba(192, 192, 192, 0.12);
  background:
    radial-gradient(800px 320px at 10% 100%, rgba(75, 63, 114, 0.5), transparent 65%),
    radial-gradient(700px 260px at 92% 8%, rgba(107, 29, 42, 0.35), transparent 60%);
}
.page-about__qual-layout {
  display: grid;
  gap: 2rem;
}
.page-about__qual-shield {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: rgba(10, 20, 40, 0.6);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: var(--about-radius);
  padding: 1.6rem;
}
.page-about__shield-svg {
  width: 112px;
  height: auto;
  flex-shrink: 0;
  filter: drop-shadow(0 0 14px rgba(0, 240, 255, 0.25));
}
.page-about__qual-id {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.page-about__qual-label {
  font-family: var(--emc-font-num);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--emc-silver);
}
.page-about__qual-value {
  font-family: var(--emc-font-num);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--emc-cyan);
}
.page-about__qual-cards {
  display: grid;
  gap: 1rem;
}
.page-about__qual-card {
  background: rgba(10, 20, 40, 0.55);
  border: 1px solid rgba(255, 42, 42, 0.2);
  border-radius: var(--emc-radius-md);
  padding: 1.3rem 1.4rem;
  transition: var(--emc-transition);
}
.page-about__qual-card:hover {
  border-color: rgba(0, 240, 255, 0.35);
}
.page-about__qual-card h3 {
  font-family: var(--emc-font-title);
  font-size: 1.14rem;
  letter-spacing: 0.04em;
  color: var(--emc-ice);
  margin: 0 0 0.5rem;
}
.page-about__qual-card p {
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--emc-silver);
  margin: 0;
}
.page-about__qual-trust {
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--emc-silver);
  background: rgba(107, 29, 42, 0.25);
  border: 1px dashed rgba(192, 192, 192, 0.28);
  border-radius: var(--emc-radius-md);
  padding: 1rem 1.25rem;
  margin: 0;
}

/* ---------- 继续浏览 ---------- */
.page-about__explore {
  padding: 2.8rem 0;
  border-top: 1px solid rgba(0, 240, 255, 0.22);
  background: linear-gradient(180deg, rgba(0, 240, 255, 0.05), transparent);
}
.page-about__explore-inner {
  display: grid;
  gap: 1.1rem;
}
.page-about__explore-label {
  font-family: var(--emc-font-num);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--emc-cyan);
  margin: 0;
}
.page-about__explore-links {
  display: grid;
  gap: 0.6rem;
}
.page-about__explore-links a {
  color: var(--emc-ice);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.75rem 1.05rem;
  border-radius: var(--emc-radius-sm);
  border: 1px solid rgba(192, 192, 192, 0.16);
  background: rgba(10, 20, 40, 0.4);
  transition: var(--emc-transition);
}
.page-about__explore-links a:hover {
  color: var(--emc-cyan);
  border-color: rgba(0, 240, 255, 0.5);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.12);
  transform: translateX(4px);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about__journey-intro {
    grid-template-columns: minmax(240px, 0.9fr) 1.1fr;
    align-items: center;
  }
  .page-about__data-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__qual-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__explore-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3rem;
  }
  .page-about__hero-figure {
    margin: 0;
  }
  .page-about__mission-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
  }
  .page-about__timeline {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.1rem;
  }
  .page-about__data-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about__data-figure {
    position: sticky;
    top: calc(var(--emc-header-h) + 3.5rem);
  }
  .page-about__qual-layout {
    grid-template-columns: minmax(280px, 0.8fr) 1.2fr;
    gap: 2.5rem;
    align-items: start;
  }
  .page-about__explore-links {
    grid-template-columns: repeat(5, 1fr);
  }
  .page-about__explore-links a {
    text-align: center;
  }
}