.page-about {
  --about-hero-title: clamp(2.5rem, 8vw, 5.25rem);
  --about-gap: clamp(2rem, 4vw, 4.5rem);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

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

/* ========== 首屏 HERO ========== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 3rem) 0 0;
  background: linear-gradient(135deg, #0A0E17 0%, #102A43 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    repeating-linear-gradient(-45deg, transparent 0 14px, rgba(26, 247, 25, 0.035) 14px 15px),
    repeating-linear-gradient(45deg, transparent 0 14px, rgba(0, 240, 255, 0.03) 14px 15px);
  pointer-events: none;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  mix-blend-mode: screen;
  filter: saturate(1.15);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-hero__content {
  max-width: 46rem;
  padding-bottom: 2.5rem;
}

.page-about .about-hero__crumb {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--neon);
  text-transform: uppercase;
  margin-bottom: 1.75rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid rgba(26, 247, 25, 0.35);
  border-radius: 999px;
  background: rgba(26, 247, 25, 0.06);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: var(--about-hero-title);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text-bright);
  margin: 0 0 1.5rem;
}

.page-about .about-hero__title-accent {
  color: var(--neon);
  text-shadow: 0 0 28px rgba(26, 247, 25, 0.35);
}

.page-about .about-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
  max-width: 36rem;
  margin: 0 0 2.25rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.page-about .about-hero__stats {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-data);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-bright);
}

.page-about .about-hero__stat-label {
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--text-dim);
}

/* ========== 品牌主张 BELIEF ========== */
.page-about .about-belief {
  background: var(--bg);
}

.page-about .about-belief__grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-belief__aside .section__index,
.page-about .about-belief__aside .section__title {
  align-self: start;
}

.page-about .about-belief__content {
  max-width: 42rem;
}

.page-about .about-belief__paragraph {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text);
  margin: 0 0 1.25rem;
}

.page-about .about-belief__paragraph:last-of-type {
  margin-bottom: 2rem;
}

.page-about .about-belief__quote {
  margin: 0;
  padding: 1.35rem 1.5rem;
  border-left: 3px solid var(--neon);
  background: rgba(26, 247, 25, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-bright);
}

.page-about .about-belief__quote-mark {
  color: var(--neon);
  font-family: var(--font-head);
  font-size: 1.6rem;
  line-height: 0;
  margin-right: 0.25rem;
}

/* ========== 发展历程 JOURNEY ========== */
.page-about .about-journey {
  background: var(--surface);
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.page-about .about-journey .container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-journey__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: 2rem;
}

.page-about .about-timeline-list {
  position: relative;
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-timeline-svg {
  position: absolute;
  left: 3px;
  top: 18px;
  width: 2px;
  height: calc(100% - 30px);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline-item {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-sm);
  background: rgba(10, 14, 23, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .about-timeline-item[open] {
  border-color: rgba(26, 247, 25, 0.3);
  background: rgba(10, 14, 23, 0.9);
}

.page-about .about-timeline-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.1rem 1rem 0;
  font-size: 0.9375rem;
  transition: background var(--transition);
}

.page-about .about-timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-summary::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(26, 247, 25, 0.12), 0 0 14px rgba(26, 247, 25, 0.5);
}

.page-about .about-timeline-year {
  font-family: var(--font-data);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--neon);
  white-space: nowrap;
}

.page-about .about-timeline-title {
  font-size: 0.9375rem;
  color: var(--text-bright);
  flex: 1;
  line-height: 1.4;
}

.page-about .about-timeline-toggle {
  position: relative;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
}

.page-about .about-timeline-toggle::before,
.page-about .about-timeline-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1.5px;
  background: var(--neon);
  transform: translate(-50%, -50%);
}

.page-about .about-timeline-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: transform var(--transition);
}

.page-about .about-timeline-item[open] .about-timeline-toggle::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-about .about-timeline-detail {
  padding: 0 1.1rem 1.1rem 0;
  margin-left: 3.5rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-timeline-detail p {
  margin: 0;
}

.page-about .about-journey__aside {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .about-journey__img {
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  width: 100%;
  object-fit: cover;
}

.page-about .about-journey__note {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1.25rem 1.5rem;
  background: rgba(10, 14, 23, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius);
}

.page-about .about-journey__note-label {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--blue);
  text-transform: uppercase;
}

.page-about .about-journey__note-value {
  font-family: var(--font-data);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.2;
}

.page-about .about-journey__note-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* ========== 数据体系 SYSTEM ========== */
.page-about .about-system {
  background: var(--bg);
}

.page-about .about-system__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .about-system-card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.4rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  min-height: 100%;
}

.page-about .about-system-card--neon {
  --card-accent: var(--neon);
}

.page-about .about-system-card--blue {
  --card-accent: var(--blue);
}

.page-about .about-system-card--amber {
  --card-accent: var(--amber);
}

.page-about .about-system-card--magenta {
  --card-accent: var(--magenta);
}

.page-about .about-system-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.page-about .about-system-card__index {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
}

.page-about .about-system-card__icon {
  width: 36px;
  height: 36px;
  color: var(--card-accent);
}

.page-about .about-system-card__title {
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--text-bright);
  font-weight: 700;
  margin: 0;
}

.page-about .about-system-card__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-dim);
  margin: 0;
}

.page-about .about-system-card__data {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.page-about .about-system-card__num {
  font-family: var(--font-data);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--card-accent);
  line-height: 1.1;
}

.page-about .about-system-card__unit {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.page-about .about-system-card__tip {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 0.8rem;
  margin: auto 0 0;
}

.page-about .about-system__footnote {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-top: 2rem;
  font-size: 0.875rem;
}

.page-about .about-system__footnote a {
  color: var(--blue);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .about-system__footnote a:hover {
  color: var(--neon);
}

.page-about .about-system__footnote-sep {
  color: var(--text-dim);
  font-family: var(--font-data);
}

/* ========== 服务能力 CAPABILITY ========== */
.page-about .about-capability {
  background:
    radial-gradient(ellipse at 15% 30%, rgba(26, 247, 25, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse at 85% 70%, rgba(0, 240, 255, 0.05) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--highlight-bg) 100%);
}

.page-about .about-capability__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: 2rem;
}

.page-about .about-capability__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-capability-stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem 1rem;
  background: rgba(10, 14, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-capability-stat:hover {
  border-color: rgba(26, 247, 25, 0.35);
  transform: translateY(-3px);
}

.page-about .about-capability-stat__num {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--neon);
  line-height: 1.1;
}

.page-about .about-capability-stat__label {
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--text-dim);
}

.page-about .about-capability__side {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  padding: 1.5rem;
  background: rgba(10, 14, 23, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
}

.page-about .about-capability__side-title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--text-bright);
  margin: 0;
}

.page-about .about-capability__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-capability__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text);
}

.page-about .about-capability__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
}

.page-about .about-capability__side .btn {
  align-self: flex-start;
}

/* ========== 团队与资历 TEAM ========== */
.page-about .about-team {
  background: var(--bg);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: 2rem;
}

.page-about .about-team__desc {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  margin: 1.5rem 0 2rem;
  max-width: 44rem;
}

.page-about .about-team__quals {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .about-team-qual {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem;
  background: rgba(17, 24, 38, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .about-team-qual:hover {
  border-color: rgba(0, 240, 255, 0.35);
  background: rgba(17, 24, 38, 1);
}

.page-about .about-team-qual__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--blue);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.2);
  margin-bottom: 0.4rem;
}

.page-about .about-team-qual__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-bright);
}

.page-about .about-team-qual__desc {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.page-about .about-team__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.page-about .about-team__aside {
  display: flex;
  align-items: center;
}

.page-about .about-team__img {
  width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
}

/* ========== 底部 CTA ========== */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(26, 247, 25, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 60%, rgba(0, 240, 255, 0.08) 0%, transparent 60%),
    linear-gradient(135deg, #0D2B3E 0%, #0A0E17 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(26, 247, 25, 0.02) 14px 15px);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  text-align: center;
}

.page-about .about-cta__title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  color: var(--text-bright);
  margin: 0 0 1rem;
}

.page-about .about-cta__desc {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0 0 2rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
}

/* ========== 响应式增强 ========== */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    padding-bottom: 3.5rem;
  }

  .page-about .about-system__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-capability__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-team__quals {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-timeline-list {
    gap: 1rem;
  }
}

@media (min-width: 992px) {
  .page-about .about-belief__grid {
    grid-template-columns: 5fr 7fr;
    gap: 4rem;
  }

  .page-about .about-journey__grid {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-journey__aside {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .about-capability__grid {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-capability__side {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .about-team__grid {
    grid-template-columns: 6fr 6fr;
    gap: 3rem;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation: none !important;
    transition: none !important;
  }
}