/* ===== About 页专属样式 ===== */
.page-about {
  --about-card-bg: rgba(15, 76, 92, 0.18);
  --about-line: rgba(255, 255, 255, 0.12);
  background-color: var(--c-bg);
}

/* —— 首屏 Hero —— */
.page-about .about-hero {
  position: relative;
  padding: 96px 0 48px;
  overflow: hidden;
  border-bottom: 1px solid var(--c-grid);
  background:
    radial-gradient(circle at 85% 15%, rgba(0, 200, 255, 0.12), transparent 42%),
    linear-gradient(180deg, rgba(15, 76, 92, 0.24), transparent 80%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero-main {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 32px;
}

.page-about .about-hero-kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-green);
}

.page-about .about-hero h1 {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-size: clamp(44px, 10vw, 84px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-text-strong);
}

.page-about .about-hero h1 span {
  display: block;
  background: linear-gradient(90deg, var(--c-blue), var(--c-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-desc {
  max-width: 640px;
  margin: 0 0 36px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-text);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 560px;
}

.page-about .hero-stat {
  padding: 16px 12px;
  background: var(--about-card-bg);
  border: 1px solid var(--c-grid);
}

.page-about .hero-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.2;
  color: var(--c-data);
}

.page-about .hero-stat-num em {
  font-style: normal;
  font-size: 14px;
  color: var(--c-blue);
}

.page-about .hero-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-text);
}

.page-about .about-hero-side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 24px 0 4px;
}

.page-about .hero-year-block {
  padding: 20px 24px;
  background: var(--c-surface);
  border-left: 6px solid var(--c-blue);
}

.page-about .hero-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 60px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-text-strong);
}

.page-about .hero-year-caption {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-blue);
}

.page-about .hero-accent-bar {
  width: 140px;
  height: 6px;
  margin-top: 20px;
  background: var(--gradient-primary);
  transform: skewX(-20deg);
}

/* —— 通用章节头 —— */
.page-about .section {
  position: relative;
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .section + .section {
  border-top: 1px solid var(--c-grid-soft);
}

.page-about .section-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 36px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .section-head-text {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.page-about .section-index {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 900;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-blue);
  text-stroke: 2px var(--c-blue);
  min-width: 72px;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-text-strong);
}

.page-about .section-note {
  align-self: flex-start;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-text);
  text-transform: uppercase;
  line-height: 1.6;
}

/* —— 01 品牌起源 —— */
.page-about .about-origin {
  background-image:
    linear-gradient(var(--c-grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid-soft) 1px, transparent 1px);
  background-size: 36px 36px;
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-origin-content p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text);
}

.page-about .about-lead {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-text-strong);
}

.page-about .about-origin-figure {
  margin: 0;
  border: 1px solid var(--c-grid);
}

/* —— 02 发展历程 —— */
.page-about .about-timeline {
  position: relative;
  margin-top: 44px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-blue), var(--c-green));
  opacity: 0.28;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 44px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 3px solid var(--c-blue);
  box-shadow: 0 0 0 4px rgba(0, 200, 255, 0.12);
}

.page-about .timeline-marker {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--c-data);
}

.page-about .timeline-card {
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--c-grid);
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text-strong);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
}

/* —— 03 数据能力 —— */
.page-about .about-capability {
  background:
    linear-gradient(180deg, rgba(6, 10, 16, 0.6), rgba(15, 76, 92, 0.3)),
    repeating-linear-gradient(135deg, transparent 0 12px, rgba(255, 255, 255, 0.02) 12px 13px);
}

.page-about .capability-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 40px;
}

.page-about .capability-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .cap-stat-card {
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--c-grid);
  border-left: 4px solid var(--c-green);
}

.page-about .cap-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-green);
}

.page-about .cap-stat-num em {
  font-style: normal;
  font-size: 14px;
  color: var(--c-text);
}

.page-about .cap-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-text);
}

.page-about .capability-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text);
}

.page-about .cap-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .cap-feature-list li {
  position: relative;
  padding: 12px 0 12px 28px;
  border-bottom: 1px solid var(--c-grid-soft);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
}

.page-about .cap-feature-list li:last-child {
  border-bottom: none;
}

.page-about .cap-feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 16px;
  height: 2px;
  background: var(--gradient-primary);
}

.page-about .about-capability-figure {
  margin: 0;
  border: 1px solid var(--c-grid);
}

/* —— 04 资质与合作 —— */
.page-about .credentials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .credential-card {
  position: relative;
  padding: 28px 24px;
  background: rgba(6, 10, 16, 0.4);
  border: 1px solid var(--c-grid);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .credential-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.page-about .credential-card:hover {
  border-color: var(--c-blue);
  transform: translateY(-2px);
}

.page-about .credential-card:hover::after {
  transform: scaleX(1);
}

.page-about .credential-tag {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  background: rgba(15, 76, 92, 0.6);
  border: 1px solid var(--c-grid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-green);
  text-transform: uppercase;
}

.page-about .credential-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text-strong);
}

.page-about .credential-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
}

/* —— 05 团队 —— */
.page-about .about-team {
  background-color: var(--c-bg-deep);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-team-content p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text);
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--c-grid);
  aspect-ratio: 3 / 2;
}

/* —— 品牌使命 —— */
.page-about .about-mission {
  padding-top: 80px;
  padding-bottom: 80px;
  background: var(--gradient-wine);
}

.page-about .mission-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.page-about .mission-index {
  display: inline-block;
  margin-bottom: 20px;
  -webkit-text-stroke-color: rgba(255, 255, 255, 0.5);
  text-stroke-color: rgba(255, 255, 255, 0.5);
}

.page-about .mission-inner h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-text-strong);
}

.page-about .mission-inner p {
  margin: 0 0 32px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .mission-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* —— 桌面端布局 —— */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 130px 0 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: stretch;
  }

  .page-about .about-hero-side {
    align-items: flex-end;
  }

  .page-about .hero-year-block {
    padding: 28px 32px;
  }

  .page-about .hero-year {
    font-size: 96px;
  }

  .page-about .hero-stat {
    padding: 24px 20px;
  }

  .page-about .hero-stat-num {
    font-size: 34px;
  }

  .page-about .section {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .section-head {
    align-items: center;
    gap: 20px;
  }

  .page-about .section-note {
    writing-mode: vertical-rl;
    margin-left: auto;
    font-size: 12px;
    letter-spacing: 0.32em;
    color: var(--c-blue);
    opacity: 0.8;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline-item {
    width: 50%;
    padding: 0 64px 56px 0;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 56px 64px;
  }

  .page-about .timeline-item::before {
    left: auto;
    right: -8px;
  }

  .page-about .timeline-item:nth-child(even)::before {
    right: auto;
    left: -8px;
  }

  .page-about .timeline-card {
    max-width: 440px;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-card {
    margin-left: auto;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    margin-right: auto;
  }

  .page-about .capability-layout {
    grid-template-columns: 280px 1fr;
    gap: 48px;
  }

  .page-about .about-capability-figure {
    margin-top: 24px;
  }

  .page-about .credentials-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-mission {
    padding-top: 104px;
    padding-bottom: 104px;
  }

  .page-about .mission-inner h2 {
    font-size: 48px;
  }
}