.page-about {
  background: var(--bg-deep);
  color: var(--text);
  overflow-x: hidden;
  font-variant-numeric: tabular-nums;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 1.5rem 0 3.25rem;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -12%;
  width: 58%;
  height: 110%;
  background:
    radial-gradient(circle at 65% 22%, rgba(0, 229, 255, 0.12), transparent 28%),
    linear-gradient(130deg, rgba(255, 107, 0, 0.1), transparent 55%);
  clip-path: polygon(18% 0, 100% 0, 88% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1.75rem;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, transparent 35%, var(--accent-2) 100%);
  transform: skewY(-1.6deg);
  transform-origin: left;
  opacity: 0.75;
  pointer-events: none;
}
.page-about .about-hero .breadcrumb {
  margin-bottom: 1.75rem;
  font-family: var(--font-data);
  font-size: 0.82rem;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: center;
  margin-top: 1.5rem;
}
.page-about .about-hero__content {
  max-width: 40rem;
}
.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.75rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.page-about .about-hero__kicker::before {
  content: "";
  width: 2.25rem;
  height: 2px;
  background: var(--accent);
  transform: skewX(-20deg);
}
.page-about .about-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-style: italic;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
}
.page-about .about-hero__lead {
  margin: 0 0 2rem;
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-about .about-hero__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(120deg, rgba(255, 107, 0, 0.18), rgba(0, 229, 255, 0.1));
  mix-blend-mode: multiply;
  pointer-events: none;
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  border-style: solid;
  border-width: 0 0 3rem 3rem;
  border-color: transparent transparent var(--accent) transparent;
}

/* ===== 核心数据 ===== */
.page-about .about-stats {
  padding: 2rem 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.page-about .about-stats__item {
  text-align: center;
  padding: 0.75rem 0.5rem;
}
.page-about .about-stats__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--accent);
}
.page-about .about-stats__item:nth-child(2) .about-stats__num,
.page-about .about-stats__item:nth-child(4) .about-stats__num {
  color: var(--accent-2);
}
.page-about .about-stats__label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ===== 发展沿革时间线 ===== */
.page-about .about-timeline {
  padding: 4rem 0 3rem;
  position: relative;
}
.page-about .section-head {
  margin-bottom: 1.5rem;
}
.page-about .section-head__kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.page-about .section-head__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-style: italic;
  font-size: var(--heading-scale);
  line-height: 1.15;
}
.page-about .section-head__desc {
  margin: 0;
  max-width: 42rem;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.75;
}
.page-about .timeline__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  position: relative;
}
.page-about .timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, var(--border) 60%, var(--accent-2) 100%);
  opacity: 0.5;
}
.page-about .timeline__item {
  position: relative;
  padding: 0 0 2rem 2.25rem;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.12);
}
.page-about .timeline__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 12%;
  bottom: 0.5rem;
  width: 42%;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 107, 0, 0.7), rgba(0, 229, 255, 0.35));
  transform: skewX(-14deg);
  opacity: 0.4;
  pointer-events: none;
}
.page-about .timeline__year {
  position: relative;
  z-index: 1;
  margin-bottom: 0.5rem;
  font-family: var(--font-data);
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.page-about .timeline__year::before {
  content: "\25E2";
  margin-right: 0.45rem;
  font-size: 1rem;
  color: var(--accent-2);
  vertical-align: middle;
}
.page-about .timeline__card {
  position: relative;
  padding: 1rem 1.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about .timeline__card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 2.75rem;
  height: 2px;
  background: var(--accent-2);
}
.page-about .timeline__card h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
}
.page-about .timeline__card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.93rem;
  line-height: 1.7;
}

/* ===== 数据能力 ===== */
.page-about .about-data {
  position: relative;
  padding: 4rem 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.page-about .about-data::before {
  content: "";
  position: absolute;
  top: 0;
  left: -8%;
  z-index: 0;
  width: 36%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255, 107, 0, 0.08), transparent 65%);
  clip-path: polygon(0 0, 100% 0, 68% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-data__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about .about-data__content {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.page-about .about-data__content::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 4rem;
  height: 3px;
  background: var(--accent-2);
}
.page-about .about-data__content h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-size: 1.2rem;
}
.page-about .about-data__content > p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.75;
}
.page-about .about-data__list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.page-about .about-data__list li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.6;
}
.page-about .about-data__list li::before {
  content: "\25B8";
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--accent);
}
.page-about .about-data__list li:nth-child(2)::before {
  color: var(--accent-2);
}
.page-about .about-data__media {
  position: relative;
}
.page-about .about-data__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
}
.page-about .about-data__media::after {
  content: "";
  position: absolute;
  right: -0.6rem;
  bottom: -0.6rem;
  width: 100%;
  height: 100%;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent-2);
  pointer-events: none;
}

/* ===== 服务承诺 ===== */
.page-about .about-promise {
  padding: 4.5rem 0 3.5rem;
}
.page-about .about-promise__cards {
  display: grid;
  gap: 1.25rem;
  margin: 2rem 0 0;
}
.page-about .about-promise__card {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.25rem 1.75rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .about-promise__card:nth-child(2) {
  border-top-color: var(--accent-2);
}
.page-about .about-promise__card:nth-child(3) {
  border-top-color: var(--gold);
}
.page-about .about-promise__card::after {
  content: "";
  position: absolute;
  right: -2rem;
  bottom: -2.5rem;
  width: 7rem;
  height: 7rem;
  border: 1px solid var(--border);
  transform: rotate(45deg);
  pointer-events: none;
}
.page-about .about-promise__num {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.page-about .about-promise__card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-size: 1rem;
}
.page-about .about-promise__card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}
.page-about .about-promise__media {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}
.page-about .about-promise__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
}
.page-about .about-promise__note {
  margin: 0;
  padding-left: 1.25rem;
  border-left: 3px solid var(--accent-2);
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ===== 合作生态 ===== */
.page-about .about-ecosystem {
  padding: 4rem 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
}
.page-about .about-ecosystem__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
.page-about .about-ecosystem__item {
  position: relative;
  padding: 1.5rem 1.5rem 1.75rem;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  transition: border-color 0.2s ease;
}
.page-about .about-ecosystem__item:nth-child(even) {
  border-left-color: var(--accent);
}
.page-about .about-ecosystem__tag {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.page-about .about-ecosystem__item:nth-child(even) .about-ecosystem__tag {
  color: var(--accent);
}
.page-about .about-ecosystem__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: 1.05rem;
}
.page-about .about-ecosystem__desc {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 底部 CTA ===== */
.page-about .about-cta {
  padding: 4rem 0 5rem;
  position: relative;
}
.page-about .about-cta__box {
  position: relative;
  overflow: hidden;
  padding: 2.25rem 1.5rem 2.75rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
}
.page-about .about-cta__box::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 0.75rem;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 60%);
}
.page-about .about-cta__box::after {
  display: none;
}
.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 32rem;
}
.page-about .about-cta__kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.page-about .about-cta__box h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-style: italic;
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
}
.page-about .about-cta__box p {
  margin: 0 0 1.5rem;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ===== 悬停交互 ===== */
@media (hover: hover) {
  .page-about .timeline__item:hover .timeline__card {
    border-color: var(--accent-2);
    transform: translateY(-2px);
  }
  .page-about .about-promise__card:hover {
    border-color: var(--accent-2);
    box-shadow: var(--shadow);
    transform: translateY(-3px);
  }
  .page-about .about-ecosystem__item:hover {
    border-color: var(--accent);
  }
}

/* ===== 桌面端增强 ===== */
@media (min-width: 760px) {
  .page-about .about-promise__cards {
    grid-template-columns: repeat(3, 1fr);
    margin-top: 2.5rem;
  }
  .page-about .about-promise__media {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 2rem;
    align-items: center;
  }
  .page-about .about-ecosystem__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .page-about .about-cta__box {
    padding: 3rem 2rem 3.5rem;
  }
  .page-about .about-cta__box::before {
    left: auto;
    right: -6%;
    top: -12%;
    width: 48%;
    height: 124%;
    background: var(--accent);
    clip-path: polygon(14% 0, 100% 0, 100% 100%, 0 100%);
  }
  .page-about .about-cta__box::after {
    display: block;
    content: "";
    position: absolute;
    right: 10%;
    bottom: 0;
    width: 26%;
    height: 48%;
    background: var(--accent-2);
    clip-path: polygon(0 18%, 100% 0, 78% 100%, 0 82%);
    opacity: 0.85;
    pointer-events: none;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2.5rem;
  }
  .page-about .about-stats__list {
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
  }
  .page-about .about-stats__item + .about-stats__item {
    border-left: 1px solid var(--border);
  }
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 2rem;
    padding-left: 2.75rem;
    padding-bottom: 2.75rem;
  }
  .page-about .timeline__item::before {
    top: 0.7rem;
  }
  .page-about .timeline__year {
    margin-bottom: 0;
    padding-top: 0.25rem;
    font-size: 2rem;
  }
  .page-about .about-data__grid {
    grid-template-columns: 1fr 0.95fr;
    gap: 3rem;
  }
}