.page-about {
  --about-gutter: clamp(16px, 5vw, 56px);
  background: var(--c-paper);
  color: var(--c-text);
}

.page-about__section {
  padding: clamp(56px, 8vw, 108px) 0;
}

.page-about__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.page-about__kicker::before {
  content: '';
  width: 28px;
  height: 2px;
  background: var(--c-accent);
  flex-shrink: 0;
}

.page-about__section-head {
  max-width: 680px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about__section-head h2 {
  margin: 14px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--c-text);
}

.page-about__section-head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ===== 顶部横幅 ===== */
.page-about__hero {
  position: relative;
  padding-top: calc(var(--header-h) + 44px);
  padding-bottom: clamp(48px, 8vw, 92px);
  background: var(--c-ink);
  overflow: hidden;
  isolation: isolate;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 84% 18%, rgba(255,107,53,.28) 0%, transparent 42%),
    radial-gradient(circle at 66% 96%, rgba(0,194,184,.16) 0%, transparent 50%);
  pointer-events: none;
}

.page-about__crumb {
  margin-bottom: 44px;
  color: rgba(255,255,255,.64);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about__crumb a {
  color: rgba(255,255,255,.8);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,.28);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about__crumb a:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}

.page-about__hero-panel {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  max-width: 900px;
}

.page-about__hero-panel h1 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #fff;
}

.page-about__hero-lead {
  max-width: 560px;
  margin: 0;
  font-size: 18px;
  line-height: 1.7;
  color: rgba(255,255,255,.74);
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  max-width: 640px;
}

@media (min-width: 640px) {
  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about__hero-stat {
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.05);
}

.page-about__hero-stat dt {
  font-size: 12px;
  color: rgba(255,255,255,.56);
  margin-bottom: 6px;
  font-family: var(--font-body);
}

.page-about__hero-stat dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}

/* ===== 01 品牌叙事 ===== */
.page-about__story {
  background: var(--c-paper);
  padding-top: clamp(64px, 9vw, 112px);
}

.page-about__story-panel {
  position: relative;
}

.page-about__story-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

@media (min-width: 992px) {
  .page-about__story-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(32px, 6vw, 72px);
    align-items: center;
  }
}

.page-about__story-copy h2 {
  margin: 14px 0 14px;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--c-text);
}

.page-about__story-lead {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--c-text);
}

.page-about__story-copy p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about__story-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 18px;
}

.page-about__story-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about__story-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--c-ink);
  border: 1px solid var(--c-border);
}

.page-about__story-figure::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 64%, rgba(255,107,53,.26));
  pointer-events: none;
}

.page-about__story-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__story-figure figcaption,
.page-about__tech-figure figcaption,
.page-about__network-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--c-muted);
  border-left: 2px solid var(--c-teal);
  padding-left: 10px;
}

/* ===== 02 发展里程碑 ===== */
.page-about__milestones {
  position: relative;
  background: var(--c-ink);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

.page-about__milestones::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 56px 56px;
}

.page-about__milestones .page-about__section-head h2 {
  color: #fff;
}

.page-about__milestones .page-about__section-head p {
  color: rgba(255,255,255,.66);
}

.page-about__timeline {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 6px 0 6px 22px;
  max-width: 640px;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 4px;
  width: 2px;
  background: rgba(255,255,255,.16);
}

.page-about__milestone {
  position: relative;
}

.page-about__milestone::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255,107,53,.18);
}

.page-about__milestone-label {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 10px;
  border: 1px solid rgba(255,107,53,.4);
  background: rgba(255,107,53,.1);
  color: var(--c-accent);
  font-family: var(--font-data);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.page-about__milestone h3 {
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}

.page-about__milestone p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.65;
  color: rgba(255,255,255,.66);
}

.page-about__timeline-cta {
  margin-top: 36px;
}

@media (min-width: 1024px) {
  .page-about__timeline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
    padding: 28px 0 8px;
    max-width: none;
  }

  .page-about__timeline::before {
    content: '';
    position: absolute;
    top: 44px;
    right: 3.5%;
    left: 3.5%;
    height: 2px;
    background: rgba(255,255,255,.16);
  }

  .page-about__timeline::after {
    content: '';
    position: absolute;
    top: 44px;
    left: 3.5%;
    width: 15.6%;
    height: 2px;
    background: var(--c-accent);
  }

  .page-about__milestone {
    padding: 0 14px 0 0;
  }

  .page-about__milestone::before {
    content: '';
    position: relative;
    left: auto;
    top: auto;
    display: block;
    width: 14px;
    height: 14px;
    margin: 8px 0 18px;
    border-radius: 50%;
    background: var(--c-ink);
    border: 3px solid var(--c-accent);
    box-shadow: 0 0 0 4px rgba(255,255,255,.06);
  }
}

/* ===== 03 技术实力 ===== */
.page-about__tech {
  background: var(--c-paper);
}

.page-about__tech-grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 992px) {
  .page-about__tech-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(32px, 6vw, 80px);
    align-items: start;
  }
}

.page-about__tech-copy h2 {
  margin: 14px 0 14px;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--c-text);
}

.page-about__tech-copy > p {
  margin: 0 0 24px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about__tech-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about__tech-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 14px;
  background: var(--c-cream);
  border: 1px solid var(--c-border);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about__tech-list li:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow);
}

.page-about__tech-num {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-teal);
  margin-top: 2px;
  flex-shrink: 0;
}

.page-about__tech-list strong {
  display: block;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about__tech-list small {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
}

.page-about__tech-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}

.page-about__tech-stats .folio-stat {
  background: var(--c-cream);
  border: 1px solid var(--c-border);
  padding: 16px 12px;
}

.page-about__tech-btn {
  margin-top: 4px;
}

.page-about__tech-figure {
  margin: 0;
  position: relative;
}

.page-about__tech-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-border);
  background: var(--c-ink);
}

/* ===== 04 团队与资质 ===== */
.page-about__team {
  background: var(--c-cream);
}

.page-about__team-grid {
  row-gap: 20px;
}

.page-about__team-card {
  position: relative;
  padding-top: 24px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), transform .2s var(--ease);
}

.page-about__team-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.page-about__team-cardnum {
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 14px;
}

.page-about__team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about__team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-muted);
}

.page-about__team-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
  padding: 20px 22px;
  background: var(--c-paper);
  border: 1px solid var(--c-border);
}

.page-about__team-note p {
  margin: 0;
  max-width: 720px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ===== 05 合作生态 ===== */
.page-about__network {
  position: relative;
  background: var(--c-ink-deep);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

.page-about__network::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-about__network::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at 82% 68%, rgba(0,194,184,.14) 0%, transparent 46%);
  pointer-events: none;
}

.page-about__network-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

@media (min-width: 992px) {
  .page-about__network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(32px, 6vw, 72px);
  }
}

.page-about__network-copy {
  position: relative;
  z-index: 1;
}

.page-about__network-copy h2 {
  margin: 14px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about__network-copy > p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: rgba(255,255,255,.66);
}

.page-about__network-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0;
}

.page-about__network-meta {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about__network-meta div {
  padding: 16px 14px;
  border: 1px solid var(--c-line);
  background: rgba(255,255,255,.04);
}

.page-about__network-meta dt {
  font-size: 12px;
  color: rgba(255,255,255,.5);
  margin-bottom: 6px;
  font-family: var(--font-body);
}

.page-about__network-meta dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-teal);
}

.page-about__network-visual {
  position: relative;
  z-index: 1;
}

.page-about__network-figure {
  margin: 0;
}

.page-about__network-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
  background: rgba(255,255,255,.04);
}

.page-about__network-figure figcaption {
  color: rgba(255,255,255,.6);
  border-left-color: var(--c-accent);
}

.page-about__network-pulse {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(255,255,255,.6);
}

.page-about__pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-teal);
  box-shadow: 0 0 0 3px rgba(0,194,184,.2);
}