.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ===== 首屏 Hero ===== */
.page-about__hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  background: var(--deep-navy);
  color: var(--white);
  display: flex;
  flex-direction: column;
  padding: 0 20px;
  overflow: hidden;
}
.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}
.page-about__hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: var(--primary);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22% 100%);
  opacity: .92;
  z-index: 0;
}
.page-about__breadcrumb {
  position: relative;
  z-index: 2;
  padding: calc(var(--header-height) + 20px) 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .8);
}
.page-about__breadcrumb a {
  color: rgba(255, 255, 255, .8);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, .35);
  transition: color .3s, border-color .3s;
}
.page-about__breadcrumb a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}
.page-about__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  flex: 1;
  align-items: center;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 0 72px;
}
.page-about__hero-copy {
  max-width: 680px;
}
.page-about__hero-eyebrow {
  color: var(--accent);
  margin-bottom: 18px;
}
.page-about__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 0 0 22px;
  text-wrap: balance;
}
.page-about__hero-lead {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.85;
  color: rgba(255, 255, 255, .82);
  max-width: 560px;
  margin: 0 0 28px;
}
.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about__hero-tags .tag-chip {
  background: rgba(255, 255, 255, .12);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, .28);
}
.page-about__hero-visual {
  position: relative;
  background: var(--cream);
  padding: 10px;
  box-shadow: 14px 14px 0 rgba(0, 0, 0, .18);
}
.page-about__hero-visual img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
}
.page-about__hero-vertical {
  position: absolute;
  top: 24%;
  right: 22px;
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .34em;
  color: rgba(255, 255, 255, .62);
  z-index: 1;
  margin: 0;
}
.page-about__hero-shape {
  position: absolute;
  top: 22%;
  right: 44%;
  width: 42px;
  height: 42px;
  background: var(--accent);
  transform: rotate(45deg);
  z-index: 1;
}

/* ===== 品牌简介 ===== */
.page-about__intro {
  background: var(--cream);
  padding: 72px 0 80px;
}
.page-about__intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}
.page-about__intro-main {
  min-width: 0;
}
.page-about__intro-prose p {
  margin: 0 0 18px;
}
.page-about__intro-plate {
  margin: 0;
  align-self: end;
}
.page-about__intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  background: var(--primary-soft);
  padding: 72px 0 56px;
}
.page-about__milestones-desc {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(43, 43, 43, .68);
  max-width: 640px;
}
.page-about__timeline {
  margin-top: 40px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  padding: 0 20px 8px;
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 32px, #000 calc(100% - 32px), transparent 100%);
  mask-image: linear-gradient(to right, transparent 0, #000 32px, #000 calc(100% - 32px), transparent 100%);
}
.page-about__timeline-inner {
  position: relative;
  display: flex;
  gap: 24px;
  min-width: 900px;
  width: max-content;
  padding: 44px 8px 32px;
}
.page-about__milestone {
  position: relative;
  flex: 0 0 280px;
  background: var(--cream);
  border: 1px solid var(--line);
  min-height: 210px;
  scroll-snap-align: start;
  transition: box-shadow .3s var(--ease-out), transform .3s var(--ease-out);
}
.page-about__milestone::before {
  content: "";
  position: absolute;
  top: -6px;
  left: -12px;
  right: -12px;
  height: 4px;
  background: var(--primary);
  opacity: .32;
  z-index: 0;
}
.page-about__milestone:first-child::before {
  left: 0;
}
.page-about__milestone:last-child::before {
  right: 0;
}
.page-about__milestone:hover {
  box-shadow: 6px 6px 0 var(--accent);
  transform: translateY(-2px);
}
.page-about__milestone summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 28px 24px 20px;
}
.page-about__milestone summary::-webkit-details-marker {
  display: none;
}
.page-about__milestone-dot {
  position: absolute;
  top: -13px;
  left: 24px;
  width: 18px;
  height: 18px;
  background: var(--accent);
  transform: rotate(45deg);
  border: 2px solid var(--cream);
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 2;
}
.page-about__milestone-version {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--primary-dark);
}
.page-about__milestone-body {
  padding: 0 24px 24px;
  border-top: 1px solid var(--line);
}
.page-about__milestone-body h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  margin: 16px 0 8px;
  letter-spacing: -.01em;
}
.page-about__milestone-body p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(43, 43, 43, .78);
  margin: 0;
}
.page-about__timeline-hint {
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(43, 43, 43, .55);
  text-align: right;
  margin: 10px 0 0;
}

/* ===== 服务理念 ===== */
.page-about__philosophy {
  background: var(--cream);
  padding: 80px 0 88px;
}
.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}
.page-about__philosophy-copy {
  min-width: 0;
}
.page-about__principles {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about__principles li {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.page-about__principle-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  color: var(--accent);
  flex-shrink: 0;
  padding-top: 3px;
}
.page-about__principles strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  color: var(--ink);
  margin-bottom: 4px;
}
.page-about__principles span:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(43, 43, 43, .72);
}
.page-about__philosophy-figure {
  margin: 0;
  background: var(--primary-soft);
  padding: 10px;
  border-left: 6px solid var(--primary);
}
.page-about__philosophy-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about__philosophy-figure figcaption {
  font-size: 12px;
  color: rgba(43, 43, 43, .62);
  padding-top: 10px;
  letter-spacing: .02em;
}

/* ===== 资质与生态 ===== */
.page-about__ecosystem {
  background: var(--deep-navy);
  color: rgba(255, 255, 255, .9);
  padding: 80px 0 88px;
}
.page-about__ecosystem .section-heading__eyebrow {
  color: var(--accent);
}
.page-about__ecosystem .section-heading__title {
  color: var(--white);
}
.page-about__ecosystem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  margin-top: 44px;
  align-items: center;
}
.page-about__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}
.page-about__stat {
  border-left: 4px solid var(--primary);
  background: rgba(255, 255, 255, .06);
  padding: 18px 18px;
}
.page-about__stat:first-child .page-about__stat-num {
  color: var(--accent);
}
.page-about__stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
  color: var(--white);
}
.page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .72);
}
.page-about__ecosystem-note {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .8);
  margin: 0 0 20px;
}
.page-about__contact-line {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .62);
  border-top: 1px solid rgba(255, 255, 255, .16);
  border-bottom: 1px solid rgba(255, 255, 255, .16);
  padding: 14px 0;
  margin: 0 0 24px;
}
.page-about__ecosystem-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about__ecosystem-actions .btn--accent {
  color: var(--deep-navy);
}
.page-about__ecosystem-actions .btn--ghost {
  border-color: rgba(255, 255, 255, .6);
  color: var(--white);
}
.page-about__ecosystem-actions .btn--ghost:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, .08);
}
.page-about__ecosystem-figure {
  margin: 0;
  background: var(--cream);
  padding: 8px;
  box-shadow: 12px 12px 0 rgba(0, 0, 0, .22);
}
.page-about__ecosystem-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about__ecosystem-figure figcaption {
  font-size: 12px;
  color: var(--ink);
  padding: 10px 4px 4px;
  letter-spacing: .02em;
}

/* ===== 渐显与延迟 ===== */
.page-about [data-reveal-delay="120"] {
  transition-delay: 120ms;
}
.page-about [data-reveal-delay="150"] {
  transition-delay: 150ms;
}
.page-about [data-reveal-delay="200"] {
  transition-delay: 200ms;
}

/* ===== 平板与桌面 ===== */
@media (min-width: 700px) {
  .page-about__intro-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 56px;
    align-items: end;
  }
  .page-about__hero-grid {
    padding: 28px 0 64px;
    grid-template-columns: 1fr 360px;
    gap: 48px;
  }
  .page-about__stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__ecosystem-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero-grid {
    grid-template-columns: 1.1fr .9fr;
    gap: 72px;
    padding: 20px 0 40px;
  }
  .page-about__hero-visual {
    margin-left: 6%;
  }
  .page-about__hero-vertical {
    right: 30px;
    font-size: 14px;
  }
  .page-about__intro {
    padding: 96px 0 104px;
  }
  .page-about__intro-grid {
    gap: 88px;
  }
  .page-about__milestones {
    padding: 96px 0 72px;
  }
  .page-about__timeline {
    margin-top: 56px;
    overflow: visible;
    padding: 0 24px;
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
    -webkit-mask-image: none;
    mask-image: none;
  }
  .page-about__timeline-inner {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    width: 100%;
    min-width: 0;
    gap: 28px;
    padding: 48px 8px 36px;
  }
  .page-about__milestone {
    flex: 0 0 auto;
  }
  .page-about__philosophy {
    padding: 104px 0 112px;
  }
  .page-about__philosophy-grid {
    grid-template-columns: 1fr 1fr;
    gap: 88px;
  }
  .page-about__ecosystem {
    padding: 104px 0 112px;
  }
  .page-about__ecosystem-grid {
    gap: 88px;
  }
}

/* ===== 减弱动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .page-about__milestone {
    transition: none;
  }
  .page-about__milestone:hover {
    transform: none;
    box-shadow: none;
  }
  .page-about__breadcrumb a,
  .page-about .btn {
    transition: none;
  }
}