.page-about {
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  background-color: var(--c-void);
  overflow: clip;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--header-h) + var(--pad)) 0 0;
  background:
    radial-gradient(720px 480px at 88% 10%, rgba(0, 70, 166, .35), transparent 62%),
    linear-gradient(150deg, rgba(255, 107, 53, .14), transparent 48%),
    var(--c-deep);
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  z-index: -1;
  width: 46%;
  height: 58%;
  background: linear-gradient(135deg, transparent 0%, transparent 32%, rgba(255, 107, 53, .34) 32%, rgba(255, 107, 53, .06) 100%);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 76%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  bottom: -8%;
  z-index: -1;
  width: 42%;
  height: 36%;
  background: radial-gradient(ellipse, rgba(0, 255, 157, .1), transparent 70%);
  pointer-events: none;
}

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero-copy {
  max-width: 720px;
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.08;
  color: var(--c-text);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 660px;
  font-family: var(--font-body);
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 22px;
}

.page-about .about-hero-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero-points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .about-hero-points li::before {
  content: "";
  flex: none;
  width: 16px;
  height: 2px;
  margin-top: 10px;
  background: var(--c-accent);
}

.page-about .about-hero-visual {
  max-width: 460px;
  margin: 0 auto;
}

.page-about .about-cover {
  position: relative;
  padding: 10px;
  background: var(--c-void);
  border: 1px solid rgba(255, 255, 255, .12);
  transform: rotate(-0.4deg);
}

.page-about .about-cover img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  filter: saturate(.92) contrast(1.08);
}

.page-about .about-cover-tag {
  position: absolute;
  right: 12px;
  bottom: 20px;
  padding: 9px 14px;
  background: rgba(8, 17, 32, .82);
  border-left: 3px solid var(--c-accent);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-lime);
}

.page-about .about-hero-stats {
  margin-top: 40px;
  padding: 22px 0;
  background: rgba(8, 17, 32, .6);
  border-top: 1px solid var(--grid-line);
}

.page-about .about-hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.page-about .about-hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  padding: 6px 2px;
  border-left: 1px solid var(--grid-line);
}

.page-about .about-hero-stat:first-child {
  border-left: none;
}

.page-about .about-hero-stat-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.1;
  color: var(--c-lime);
}

.page-about .about-hero-stat-label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-muted);
}

/* ===== 区块头部 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .about-section-index {
  flex: none;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  background: rgba(255, 107, 53, .14);
  border-left: 3px solid var(--c-accent);
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 13px;
  color: var(--c-accent);
  line-height: 1;
}

.page-about .about-section-head h2 {
  position: relative;
  margin: 0;
  padding-bottom: 12px;
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.12;
  color: var(--c-text);
}

.page-about .about-section-head h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46px;
  height: 4px;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, 86% 100%, 0 100%);
}

/* ===== 品牌源起 ===== */
.page-about .about-origin {
  position: relative;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-origin-copy p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-muted);
}

.page-about .about-origin-sign {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding: 14px 16px;
  background: rgba(255, 107, 53, .06);
  border-left: 3px solid var(--c-accent);
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--c-text);
}

.page-about .about-origin-sign [aria-hidden] {
  color: var(--c-accent);
  font-weight: 700;
}

.page-about .about-origin-aside {
  display: grid;
  gap: 14px;
}

.page-about .about-origin-card {
  padding: 22px 24px;
  background: linear-gradient(150deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .01));
  border: 1px solid var(--grid-line);
  border-bottom: 3px solid var(--c-accent);
}

.page-about .about-origin-card-key {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-silver);
  margin-bottom: 8px;
}

.page-about .about-origin-card-value {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.2;
  color: var(--c-text);
}

.page-about .about-origin-card-desc {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-muted);
}

/* ===== 数据标准 ===== */
.page-about .about-standard {
  background: linear-gradient(180deg, rgba(8, 17, 32, .82), rgba(8, 17, 32, .4)), var(--c-deep);
}

.page-about .about-standard-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-standard-frame {
  position: relative;
  padding: 8px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--grid-line);
}

.page-about .about-standard-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .about-standard-badge {
  position: absolute;
  right: 10px;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: rgba(8, 17, 32, .82);
  border-left: 3px solid var(--c-lime);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--c-text);
}

.page-about .about-standard-content > p {
  margin: 0 0 22px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-flow-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--grid-line);
}

.page-about .about-flow-index {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--c-accent);
  border-bottom: 2px solid var(--c-accent);
  height: fit-content;
}

.page-about .about-flow-body h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 17px;
  color: var(--c-text);
}

.page-about .about-flow-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  overflow: hidden;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -6%;
  width: 28%;
  background: radial-gradient(ellipse at left center, rgba(0, 70, 166, .3), transparent 70%);
  pointer-events: none;
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  position: relative;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 12px;
  left: 7px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-accent), var(--c-silver));
  transform: translateX(-1px);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 36px;
  margin-bottom: 26px;
}

.page-about .about-timeline-marker {
  position: absolute;
  top: 20px;
  left: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 3px solid var(--c-accent);
  transition: background .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-timeline-marker::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid var(--c-accent);
  opacity: 0;
  transform: scale(.7);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}

@media (hover: hover) {
  .page-about .about-timeline-item:hover .about-timeline-marker {
    background: var(--c-lime);
    border-color: var(--c-lime);
  }
  .page-about .about-timeline-item:hover .about-timeline-marker::after {
    opacity: 1;
    transform: scale(1.15);
  }
}

.page-about .about-timeline-item:focus-within .about-timeline-marker {
  background: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .about-timeline-card {
  padding: 18px 20px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--grid-line);
  border-top: 3px solid var(--c-accent);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}

@media (hover: hover) {
  .page-about .about-timeline-item:hover .about-timeline-card {
    transform: translateY(-4px);
    border-color: rgba(255, 107, 53, .45);
    background: rgba(255, 255, 255, .05);
  }
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 30px;
  line-height: 1.2;
  color: var(--c-accent);
  margin-bottom: 6px;
}

.page-about .about-timeline-card h3 {
  margin: 4px 0 6px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-text);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ===== 服务规模 ===== */
.page-about .about-scale {
  position: relative;
}

.page-about .about-scale-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-scale-card {
  display: flex;
  flex-direction: column;
  padding: 22px 18px 20px;
  background: linear-gradient(155deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .01));
  border: 1px solid var(--grid-line);
  border-bottom: 3px solid var(--c-accent);
  min-height: 132px;
}

.page-about .about-scale-card-tag {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-silver);
}

.page-about .about-scale-card-num {
  display: block;
  margin: 10px 0 6px;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
  color: var(--c-lime);
}

.page-about .about-scale-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
}

.page-about .about-growth-panel {
  display: grid;
  gap: 28px;
  margin-top: 48px;
  padding: 24px;
  background: linear-gradient(140deg, rgba(255, 107, 53, .08), transparent 45%), rgba(255, 255, 255, .02);
  border: 1px solid var(--grid-line);
  border-left: 4px solid var(--c-accent);
}

.page-about .about-growth-copy h3,
.page-about .about-team-heading h3 {
  margin: 8px 0 14px;
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--c-text);
}

.page-about .about-growth-copy p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-growth-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-growth-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--c-muted);
}

.page-about .about-growth-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 2px;
  background: var(--c-lime);
}

.page-about .about-growth-chart img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--grid-line);
}

.page-about .about-team-panel {
  display: grid;
  gap: 24px;
  margin-top: 22px;
  padding: 26px 24px;
  background: rgba(8, 17, 32, .55);
  border: 1px solid var(--grid-line);
  border-top: 3px solid var(--c-lime);
}

.page-about .about-team-meta > p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 640px) {
  .page-about .about-hero-points {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: 1.1fr .8fr;
    gap: 64px;
  }

  .page-about .about-origin-sign {
    margin-top: 30px;
  }

  .page-about .about-standard-grid {
    grid-template-columns: .9fr 1.1fr;
    gap: 56px;
  }

  .page-about .about-flow-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .about-growth-panel {
    grid-template-columns: .85fr 1.15fr;
    align-items: center;
    gap: 40px;
    padding: 36px 40px;
  }

  .page-about .about-team-panel {
    grid-template-columns: .8fr 1.2fr;
    align-items: center;
    gap: 48px;
    padding: 36px 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr .6fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-hero-visual {
    margin: 0;
    max-width: 440px;
    justify-self: end;
  }
}