.page-about {
  --about-muted: rgba(245, 242, 237, 0.68);
  --about-muted-deep: rgba(10, 27, 58, 0.72);
  background: var(--deep-blue);
  color: var(--paper-white);
  line-height: 1.7;
  position: relative;
  overflow-x: clip;
}

.page-about ::selection {
  background: var(--energy-orange);
  color: var(--deep-ink);
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 24px 0;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--grey-slate);
  letter-spacing: 0.04em;
}

.page-about .about-breadcrumb a {
  color: var(--grey-slate);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

.page-about .about-breadcrumb a:hover {
  color: var(--energy-orange);
}

.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--paper-white);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 48px 24px 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "STORY";
  position: absolute;
  top: 20px;
  right: -20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(120px, 24vw, 340px);
  line-height: 0.8;
  letter-spacing: -0.06em;
  text-transform: uppercase;
  color: rgba(245, 242, 237, 0.045);
  white-space: nowrap;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-hero-index {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--signal-green);
  text-transform: uppercase;
}

.page-about .about-hero-index::after {
  content: "";
  width: 56px;
  height: 2px;
  background: var(--energy-orange);
}

.page-about .about-hero h1 {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper-white);
}

.page-about .about-hero h1 span {
  display: block;
  color: var(--energy-orange);
}

.page-about .about-hero-lead {
  margin: 0 0 16px;
  max-width: 640px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 26px);
  line-height: 1.3;
  color: var(--signal-green);
}

.page-about .about-hero-summary {
  margin: 0 0 32px;
  max-width: 640px;
  font-size: 15px;
  color: var(--about-muted);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-visual {
  position: relative;
  max-width: 620px;
  margin: 0 auto;
  padding-bottom: 32px;
}

.page-about .about-hero-frame {
  position: relative;
  max-width: 560px;
  margin-left: auto;
  border: 4px solid var(--energy-orange);
  transform: rotate(2.2deg);
  background: var(--corpus-blue);
}

.page-about .about-hero-frame::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 2px solid var(--signal-green);
  pointer-events: none;
}

.page-about .about-hero-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero-stamp {
  position: absolute;
  bottom: 0;
  left: 4%;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(64px, 12vw, 110px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--signal-green);
  text-stroke: 2px var(--signal-green);
  opacity: 0.9;
  pointer-events: none;
}

/* ===== 数据栏 ===== */
.page-about .about-stats {
  margin-top: 64px;
  padding: 52px 20px 56px;
  background: var(--deep-ink);
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px 16px;
  max-width: 1080px;
  margin: 0 auto;
}

.page-about .about-stat-item {
  display: flex;
  flex-direction: column;
  padding-left: 14px;
  border-left: 3px solid var(--signal-green);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 46px);
  line-height: 1;
  color: var(--signal-green);
  letter-spacing: -0.03em;
}

.page-about .about-stat-label {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(245, 242, 237, 0.55);
}

/* ===== 品牌定位（浅色纸面） ===== */
.page-about .about-position {
  position: relative;
  margin-top: 64px;
  padding: 72px 24px 68px;
  background: var(--paper-white);
  color: var(--deep-ink);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.page-about .about-position::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(10, 27, 58, 0.028) 0px,
    rgba(10, 27, 58, 0.028) 1px,
    transparent 1px,
    transparent 4px
  );
  pointer-events: none;
}

.page-about .about-position-grid {
  position: relative;
  display: grid;
  gap: 36px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-position-main .section-kicker {
  color: var(--energy-orange);
}

.page-about .about-position h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--deep-ink);
}

.page-about .about-lede {
  margin: 0 0 20px;
  font-size: 18px;
  font-weight: 600;
  color: var(--corpus-blue);
}

.page-about .about-position-main p {
  font-size: 15px;
  color: var(--about-muted-deep);
  margin: 0 0 16px;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-tags .tag {
  border: 1px solid rgba(10, 27, 58, 0.22);
  background: var(--paper-white);
  color: var(--deep-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 6px 14px;
  border-radius: 999px;
  transition:
    background 0.2s var(--ease-out),
    color 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out);
}

.page-about .about-tags .tag:hover {
  background: var(--energy-orange);
  border-color: var(--energy-orange);
  color: var(--deep-ink);
}

.page-about .about-quote-card {
  position: relative;
  margin: 0;
  padding: 24px 22px 20px;
  background: var(--deep-blue);
  color: var(--paper-white);
  border-left: 4px solid var(--energy-orange);
  border-radius: 0 14px 0 14px;
}

.page-about .about-quote-card::before {
  content: "“";
  position: absolute;
  top: -18px;
  left: 10px;
  font-family: var(--font-display);
  font-size: 64px;
  line-height: 1;
  color: var(--energy-orange);
  pointer-events: none;
}

.page-about .about-quote-card p {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper-white);
}

.page-about .about-quote-source {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal-green);
  text-transform: uppercase;
}

/* ===== 数据如何产生 ===== */
.page-about .about-process {
  padding: 76px 24px 40px;
}

.page-about .about-process-head {
  max-width: 760px;
  margin: 0 auto 40px;
  text-align: center;
}

.page-about .about-process-head .section-kicker {
  color: var(--signal-green);
}

.page-about .about-process h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.12;
  color: var(--paper-white);
}

.page-about .about-process-intro {
  margin: 0;
  font-size: 15px;
  color: var(--about-muted);
}

.page-about .about-process-steps {
  display: grid;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-step {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--corpus-blue);
  border-left: 4px solid var(--energy-orange);
  border-radius: 0 12px 0 12px;
  transition:
    box-shadow 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
}

.page-about .about-step:hover {
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
  transform: translateY(-4px);
}

.page-about .about-step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-green);
  margin-bottom: 14px;
}

.page-about .about-step h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper-white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  color: var(--about-muted);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 72px 24px 64px;
}

.page-about .about-milestones-head {
  max-width: 720px;
  margin-bottom: 52px;
}

.page-about .about-milestones-head .section-kicker {
  color: var(--energy-orange);
}

.page-about .about-milestones h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.12;
  color: var(--paper-white);
}

.page-about .about-milestones-head p {
  margin: 0;
  font-size: 15px;
  color: var(--about-muted);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 28px;
  max-width: 880px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 0;
  left: 27px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--energy-orange) 0%,
    var(--signal-green) 45%,
    var(--energy-orange) 75%,
    var(--corpus-blue) 100%
  );
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 34px 28px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  top: 4px;
  left: -26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--energy-orange);
  border: 3px solid var(--deep-blue);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.3);
}

.page-about .about-timeline-year {
  display: inline-block;
  padding: 3px 12px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--signal-green);
  background: var(--corpus-blue);
  border-radius: 3px;
}

.page-about .about-timeline-card {
  padding: 20px 20px 18px;
  background: var(--corpus-blue);
  border-left: 4px solid var(--energy-orange);
  border-radius: 0 10px 0 10px;
  transition:
    box-shadow 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
}

.page-about .about-timeline-card:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  transform: translateX(4px);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper-white);
}

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

.page-about .about-timeline-media {
  position: relative;
  margin: 6px 0 36px 28px;
  padding: 10px;
  background: var(--corpus-blue);
  border: 3px solid var(--energy-orange);
  border-radius: 0 14px 0 14px;
  transform: rotate(-1.2deg);
  max-width: 600px;
}

.page-about .about-timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

/* ===== 团队与价值观 ===== */
.page-about .about-team {
  padding: 72px 24px 72px;
  background: var(--corpus-blue);
  border-top: 4px solid var(--energy-orange);
  border-bottom: 4px solid var(--signal-green);
}

.page-about .about-team-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.page-about .about-team-head .section-kicker {
  color: var(--signal-green);
}

.page-about .about-team h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.12;
  color: var(--paper-white);
}

.page-about .about-team-head p {
  margin: 0;
  font-size: 15px;
  color: var(--about-muted);
}

.page-about .about-team-layout {
  display: grid;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-team-visual {
  position: relative;
  border: 3px solid var(--signal-green);
  border-radius: 0 16px 0 16px;
  transform: rotate(-1deg);
  box-shadow: 12px 12px 0 var(--energy-orange);
  background: var(--deep-blue);
  align-self: start;
}

.page-about .about-team-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 0 13px 0 13px;
}

.page-about .about-team-values {
  display: grid;
  gap: 16px;
}

.page-about .about-value {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--deep-blue);
  border-left: 4px solid var(--energy-orange);
  border-radius: 0 10px 0 10px;
  transition:
    box-shadow 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
}

.page-about .about-value:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  transform: translateX(4px);
}

.page-about .about-value-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-green);
  margin-bottom: 8px;
}

.page-about .about-value h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper-white);
}

.page-about .about-value p {
  margin: 0;
  font-size: 14px;
  color: var(--about-muted);
}

/* ===== 底部 CTA ===== */
.page-about .about-cta {
  position: relative;
  padding: 80px 24px;
  background: var(--energy-orange);
  clip-path: polygon(0 7%, 100% 0, 100% 93%, 0 100%);
}

.page-about .about-cta-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.08;
  color: var(--deep-ink);
}

.page-about .about-cta p {
  margin: 0 auto 28px;
  max-width: 500px;
  font-size: 15px;
  color: var(--about-muted-deep);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.page-about .about-cta .btn-primary {
  background: var(--deep-ink);
  border-color: var(--deep-ink);
  color: var(--paper-white);
}

.page-about .about-cta .btn-primary:hover {
  background: var(--deep-blue);
  border-color: var(--deep-blue);
}

.page-about .about-cta .btn-ghost {
  border-color: var(--deep-ink);
  color: var(--deep-ink);
  background: transparent;
}

.page-about .about-cta .btn-ghost:hover {
  background: rgba(10, 27, 58, 0.1);
  border-color: var(--deep-ink);
}

/* ===== 桌面端 ≥ 860px ===== */
@media (min-width: 860px) {
  .page-about .about-breadcrumb {
    padding-left: 48px;
    padding-right: 48px;
  }

  .page-about .about-hero {
    padding: 64px 48px 0;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero-visual {
    margin: 0;
    padding-bottom: 44px;
  }

  .page-about .about-stats {
    margin-top: 88px;
    padding: 64px 48px 72px;
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-stat-num {
    font-size: 46px;
  }

  .page-about .about-position {
    margin-top: 88px;
    padding: 96px 48px;
  }

  .page-about .about-position-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-quote-card {
    margin-top: 56px;
  }

  .page-about .about-process {
    padding: 96px 48px 64px;
  }

  .page-about .about-process-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 8px;
  }

  .page-about .about-step {
    padding: 30px 26px 26px;
  }

  .page-about .about-milestones {
    padding: 88px 48px 80px;
  }

  .page-about .about-milestones-head {
    margin-bottom: 64px;
    max-width: 800px;
  }

  .page-about .about-timeline {
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-team {
    padding: 96px 48px;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 64px;
  }

  .page-about .about-cta {
    padding: 112px 48px;
  }

  .page-about .about-cta h2 {
    font-size: 46px;
  }
}

/* ===== 桌面端 ≥ 1280px ===== */
@media (min-width: 1280px) {
  .page-about .about-hero {
    padding-left: 64px;
    padding-right: 64px;
  }

  .page-about .about-position,
  .page-about .about-process,
  .page-about .about-milestones,
  .page-about .about-team,
  .page-about .about-cta {
    padding-left: 64px;
    padding-right: 64px;
  }
}

/* ===== 减少动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    transform: none !important;
  }
}