.page-about {
  --about-hero-pad: clamp(2.5rem, 8vw, 6rem);
  --about-grid-line: rgba(0, 168, 232, 0.08);
  --about-grid-size: 36px;
  --about-card-bg: rgba(245, 247, 250, 0.72);
  --about-dark-card: rgba(10, 17, 40, 0.88);
  --about-accent: var(--ice-blue);
  overflow-x: hidden;
  color: var(--ink-gray);
}

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

/* ============ Hero / 品牌宣言 ============ */
.page-about .about-hero {
  position: relative;
  background: var(--dark-night);
  padding: 2.5rem 1.25rem 3rem;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: var(--about-grid-size) var(--about-grid-size);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, rgba(0,0,0,0.9), transparent 78%);
  mask-image: radial-gradient(ellipse at 50% 0%, rgba(0,0,0,0.9), transparent 78%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--flame-orange), var(--ice-blue) 60%, var(--ice-deep));
  z-index: 2;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .about-hero .breadcrumb {
  margin-bottom: 2rem;
}
.page-about .about-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ice-blue);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.page-about .about-hero__tag::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--flame-orange);
}
.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 8vw, 4.2rem);
  line-height: 1.08;
  color: var(--snow-white);
  letter-spacing: 0.01em;
}
.page-about .about-hero__lead {
  max-width: 46rem;
  color: rgba(245, 247, 250, 0.82);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0 0 2rem;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}
.page-about .about-hero__meta-item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  color: rgba(245, 247, 250, 0.7);
  font-size: 0.875rem;
  border-left: 2px solid var(--ice-blue);
  padding-left: 0.75rem;
}
.page-about .about-hero__meta-item .data-text {
  color: var(--snow-white);
  font-size: 1.1rem;
  font-weight: 700;
}

/* ============ 品牌起源 ============ */
.page-about .about-origin {
  padding: 3.5rem 1.25rem;
  background: var(--snow-white);
}
.page-about .about-origin__content {
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .about-origin__content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--deep-night);
  margin: 0.25rem 0 1.25rem;
}
.page-about .about-origin__content p {
  line-height: 1.85;
  color: var(--ink-gray);
  margin-bottom: 1rem;
}
.page-about .about-origin__content .btn {
  margin-top: 0.75rem;
}
.page-about .about-origin__figure {
  margin: 2rem auto 0;
  max-width: 640px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-blue);
  box-shadow: var(--shadow-glass);
  position: relative;
}
.page-about .about-origin__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 168, 232, 0.14), rgba(15, 26, 44, 0.3));
  pointer-events: none;
}

/* ============ 发展历程 ============ */
.page-about .about-timeline {
  padding: 3.5rem 1.25rem;
  background: linear-gradient(180deg, var(--ice-light) 0%, var(--snow-white) 42%);
}
.page-about .about-timeline__head {
  max-width: var(--content-width);
  margin: 0 auto 2.5rem;
}
.page-about .about-timeline__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--deep-night);
  margin: 0.25rem 0 0.75rem;
}
.page-about .about-timeline__lead {
  color: var(--ink-gray);
  line-height: 1.7;
  max-width: 38rem;
}
.page-about .about-timeline__body {
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--ice-blue), var(--ice-deep) 55%, var(--flame-orange));
}
.page-about .timeline-item {
  position: relative;
  padding-left: 52px;
  margin-bottom: 1.75rem;
}
.page-about .timeline-node {
  position: absolute;
  left: 0;
  top: 2px;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--ice-blue), var(--ice-deep));
  clip-path: polygon(25% 5%, 75% 5%, 100% 50%, 75% 95%, 25% 95%, 0% 50%);
  display: grid;
  place-items: center;
  transition: background 0.25s ease, transform 0.25s ease;
}
.page-about .timeline-node::after {
  content: "";
  width: 9px;
  height: 9px;
  background: var(--snow-white);
  clip-path: polygon(25% 5%, 75% 5%, 100% 50%, 75% 95%, 25% 95%, 0% 50%);
}
.page-about .timeline-item:hover .timeline-node,
.page-about .timeline-item:focus-within .timeline-node {
  background: var(--flame-orange);
  transform: rotate(15deg) scale(1.06);
}
.page-about .timeline-card {
  background: var(--about-card-bg);
  border: 1px solid var(--line-blue);
  border-left: 4px solid var(--ice-blue);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
  backdrop-filter: blur(6px);
}
.page-about .timeline-item:hover .timeline-card,
.page-about .timeline-item:focus-within .timeline-card {
  border-left-color: var(--flame-orange);
  box-shadow: var(--shadow-float);
  transform: translateX(4px);
}
.page-about .timeline-year {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ice-deep);
  background: var(--ice-light);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
  margin-bottom: 0.6rem;
}
.page-about .timeline-card h3 {
  font-size: 1.1rem;
  color: var(--deep-night);
  margin: 0 0 0.4rem;
}
.page-about .timeline-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--ink-gray);
  margin: 0;
}
.page-about .about-timeline__figure {
  margin: 2rem 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  max-height: 520px;
  border: 1px solid var(--line-blue);
  box-shadow: var(--shadow-glass);
}
.page-about .about-timeline__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ 数据沉淀 ============ */
.page-about .about-stats {
  position: relative;
  background: var(--deep-night);
  padding: 3.5rem 1.25rem;
  overflow: hidden;
}
.page-about .about-stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 168, 232, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 168, 232, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.page-about .about-stats::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--ice-blue), var(--flame-orange));
  opacity: 0.6;
}
.page-about .about-stats__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .about-stats__head {
  margin-bottom: 1.75rem;
}
.page-about .about-stats__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--snow-white);
  margin: 0.25rem 0 0;
}
.page-about .about-stats .section-tag {
  color: var(--ice-blue);
}
.page-about .stats-board {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
}
.page-about .stats-board__item {
  background: rgba(245, 247, 250, 0.07);
  border: 1px solid rgba(0, 168, 232, 0.35);
  border-radius: var(--radius);
  padding: 1.35rem 0.9rem;
  text-align: center;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}
.page-about .stats-board__item:hover {
  background: rgba(0, 168, 232, 0.14);
  border-color: var(--ice-blue);
  transform: translateY(-3px);
}
.page-about .stats-board__num {
  font-family: var(--font-data);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  color: var(--ice-blue);
  margin: 0 0 0.25rem;
  line-height: 1.1;
}
.page-about .stats-board__label {
  color: rgba(245, 247, 250, 0.82);
  font-size: 0.875rem;
  line-height: 1.4;
  margin: 0;
}
.page-about .about-stats__note {
  margin-top: 1.75rem;
  color: rgba(245, 247, 250, 0.68);
  font-size: 0.875rem;
  line-height: 1.6;
  border-left: 3px solid var(--flame-orange);
  padding-left: 1rem;
}

/* ============ 团队与文化 ============ */
.page-about .about-team {
  padding: 3.5rem 1.25rem;
  background: var(--snow-white);
}
.page-about .about-team__intro {
  max-width: var(--content-width);
  margin: 0 auto 2rem;
}
.page-about .about-team__intro h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--deep-night);
  margin: 0.25rem 0 0.75rem;
}
.page-about .about-team__intro p {
  color: var(--ink-gray);
  line-height: 1.75;
  max-width: 40rem;
}
.page-about .about-team__cards {
  display: grid;
  gap: 1rem;
  max-width: var(--content-width);
  margin: 0 auto 2rem;
}
.page-about .about-team__card {
  background: #ffffff;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  border-top: 4px solid var(--ice-blue);
  box-shadow: 0 2px 12px rgba(10, 17, 40, 0.06);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.page-about .about-team__card:hover {
  box-shadow: var(--shadow-float);
  transform: translateY(-3px);
}
.page-about .about-team__card h3 {
  font-size: 1.05rem;
  color: var(--deep-night);
  margin: 0 0 0.5rem;
}
.page-about .about-team__card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-gray);
  margin: 0;
}
.page-about .about-team__quote {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background: var(--deep-night);
  border-radius: var(--radius);
  position: relative;
}
.page-about .about-team__quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  bottom: 1rem;
  width: 4px;
  background: linear-gradient(180deg, var(--ice-blue), var(--flame-orange));
}
.page-about .about-team__quote p {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--snow-white);
  margin: 0 0 0.4rem;
}
.page-about .about-team__quote cite {
  font-style: normal;
  font-size: 0.875rem;
  color: rgba(245, 247, 250, 0.65);
}

/* ============ 品牌美学 ============ */
.page-about .about-aesthetic {
  padding: 3.5rem 1.25rem;
  background: linear-gradient(135deg, var(--ice-light) 0%, var(--snow-white) 48%, rgba(255, 107, 53, 0.08) 100%);
}
.page-about .about-aesthetic__text {
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .about-aesthetic__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--deep-night);
  margin: 0.25rem 0 0.9rem;
}
.page-about .about-aesthetic__text p {
  line-height: 1.85;
  color: var(--ink-gray);
  margin-bottom: 1rem;
}
.page-about .about-aesthetic__figure {
  margin: 2rem auto 1.5rem;
  max-width: 720px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-blue);
  box-shadow: var(--shadow-glass);
}
.page-about .about-aesthetic__palette {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .palette-item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 1rem 0.5rem;
  border-radius: var(--radius);
  text-align: center;
  line-height: 1.5;
  border: 1px solid var(--line-blue);
  min-height: 84px;
}
.page-about .palette-item--ice {
  background: var(--ice-blue);
  color: #ffffff;
}
.page-about .palette-item--orange {
  background: var(--flame-orange);
  color: #ffffff;
}
.page-about .palette-item--snow {
  background: var(--snow-white);
  color: var(--deep-night);
}
.page-about .palette-item--night {
  background: var(--deep-night);
  color: var(--snow-white);
  border-color: var(--deep-night);
}

/* ============ CTA 收尾 ============ */
.page-about .about-cta {
  background: var(--dark-night);
  padding: 3rem 1.25rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--flame-orange), var(--ice-blue), var(--flame-orange));
}
.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
}
.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  color: var(--snow-white);
  margin: 0 0 0.6rem;
}
.page-about .about-cta p {
  color: rgba(245, 247, 250, 0.72);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 34rem;
  margin: 0 auto 1.5rem;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}
.page-about .about-cta .btn-outline--light {
  border-color: rgba(245, 247, 250, 0.6);
  color: var(--snow-white);
}
.page-about .about-cta .btn-outline--light:hover {
  border-color: var(--ice-blue);
  color: var(--ice-blue);
}

/* ============ 桌面端 ≥ 750px ============ */
@media (min-width: 750px) {
  .page-about .about-hero {
    padding: 3rem 2rem 4.5rem;
  }
  .page-about .about-origin {
    padding: 4.5rem 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }
  .page-about .about-origin__content,
  .page-about .about-origin__figure {
    max-width: none;
    margin: 0;
  }
  .page-about .about-timeline {
    padding: 4.5rem 2rem;
  }
  .page-about .timeline-item {
    padding-left: 60px;
  }
  .page-about .timeline-card {
    padding: 1.35rem 1.5rem;
  }
  .page-about .stats-board {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
  .page-about .about-team {
    padding: 4.5rem 2rem;
  }
  .page-about .about-team__cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about .about-aesthetic {
    padding: 4.5rem 2rem;
  }
  .page-about .about-aesthetic__palette {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-cta {
    padding: 4rem 2rem;
  }
}

/* ============ 桌面端 ≥ 1024px ============ */
@media (min-width: 1024px) {
  .page-about .about-timeline__body {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
    align-items: start;
  }
  .page-about .about-timeline__figure {
    margin: 0;
    max-height: none;
    align-self: stretch;
    position: sticky;
    top: 2rem;
  }
  .page-about .about-timeline__figure img {
    max-height: 760px;
  }
  .page-about .about-aesthetic__text {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .about-aesthetic__text h2 {
    grid-column: 1 / -1;
  }
  .page-about .about-aesthetic__text p {
    margin-bottom: 0;
  }
  .page-about .about-aesthetic__figure {
    max-width: 900px;
  }
}