/* ==========================================
   Page: about — 品牌概况
   作用域：.page-about
   ========================================== */

.page-about {
  background: var(--color-primary-deep);
  color: var(--color-warm-gray);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about .container {
  padding-top: 16px;
  padding-bottom: 16px;
}

.page-about .breadcrumb {
  margin: 0;
  padding-top: 12px;
}

/* ========== 1. 品牌简介 / Hero ========== */

.page-about .about-hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-deep) 0%, var(--color-primary) 52%, var(--color-primary-lift) 100%);
  overflow: hidden;
  padding: 48px 0 56px;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 220px;
  height: 10px;
  background: var(--color-accent);
  clip-path: polygon(100% 0, 100% 100%, 12% 100%);
  z-index: 1;
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 42px;
  background: var(--color-primary-deep);
  clip-path: polygon(0 100%, 0 0, 100% 100%);
  z-index: 1;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about .about-hero__copy {
  flex: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.08;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 10px 0 18px;
  transform: skewX(-4deg);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.page-about .about-hero__lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-white);
  opacity: 0.92;
  margin: 0 0 14px;
  max-width: 640px;
}

.page-about .about-hero__text {
  font-size: 15px;
  color: var(--color-warm-gray);
  max-width: 600px;
  margin: 0 0 28px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  flex: 0 0 auto;
  max-width: 600px;
  width: 100%;
}

.page-about .about-hero__photo img {
  transform: rotate(-1.5deg) scale(1.03);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
}

/* ========== 2. 发展里程碑 ========== */

.page-about .about-milestones {
  position: relative;
  background:
    linear-gradient(var(--color-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px),
    var(--color-primary-deep);
  background-size: 44px 44px;
  padding: 64px 0 72px;
}

.page-about .about-milestones__head {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-milestones__intro {
  color: var(--color-warm-gray);
  font-size: 16px;
  margin-top: 12px;
}

.page-about .about-milestones__grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about .about-milestones__timeline {
  position: relative;
  margin: 0;
  padding: 0;
}

.page-about .about-milestones__item {
  position: relative;
  padding: 0 0 36px 28px;
  border-left: 2px solid var(--color-line-strong);
}

.page-about .about-milestones__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-milestones__item::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 4px;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: rotate(45deg);
  box-shadow: 0 0 16px rgba(57, 255, 136, 0.7);
}

.page-about .about-milestones__item:last-child::before {
  background: var(--color-warm);
  box-shadow: 0 0 16px rgba(255, 107, 44, 0.55);
}

.page-about .about-milestones__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.page-about .about-milestones__body h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

.page-about .about-milestones__body p {
  font-size: 15px;
  color: var(--color-warm-gray);
  margin: 0;
  max-width: 520px;
}

.page-about .about-milestones__media {
  position: relative;
}

.page-about .about-milestones__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

/* ========== 3. 数据能力 ========== */

.page-about .about-capability {
  position: relative;
  background: linear-gradient(180deg, var(--color-primary-deep) 0%, var(--color-primary) 100%);
  padding: 64px 0 72px;
}

.page-about .about-capability__head {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-capability__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-capability__card {
  background: rgba(31, 41, 55, 0.88);
  border: 1px solid var(--color-line-strong);
  padding: 28px 24px;
  height: 100%;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-capability__card:hover {
  border-color: rgba(57, 255, 136, 0.6);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about .about-capability__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: 14px;
}

.page-about .about-capability__card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 8px;
}

.page-about .about-capability__card p {
  font-size: 14px;
  color: var(--color-warm-gray);
  margin: 0;
}

.page-about .about-capability__media {
  margin-top: 40px;
  max-width: 840px;
}

.page-about .about-capability__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
}

.page-about .about-capability__caption {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-warm-gray);
  border-left: 3px solid var(--color-accent);
  padding-left: 14px;
}

/* ========== 4. 合作生态 ========== */

.page-about .about-ecosystem {
  position: relative;
  background: var(--color-primary-deep);
  padding: 48px 0 64px;
}

.page-about .about-ecosystem__inner {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about .about-ecosystem__copy p {
  font-size: 16px;
  color: var(--color-warm-gray);
  margin: 0 0 14px;
  max-width: 620px;
}

.page-about .about-ecosystem__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-ecosystem__item {
  position: relative;
  background: rgba(31, 41, 55, 0.72);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-warm);
  border-radius: var(--radius);
  padding: 20px 20px 18px 24px;
  transition: transform 0.2s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-ecosystem__item:hover {
  transform: translateX(6px);
  border-color: var(--color-line-strong);
}

.page-about .about-ecosystem__index {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-line-strong);
  margin-bottom: 4px;
}

.page-about .about-ecosystem__tag {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-warm);
  margin-bottom: 6px;
}

.page-about .about-ecosystem__item p {
  font-size: 14px;
  color: var(--color-warm-gray);
  margin: 0;
}

/* ========== 5. 团队与承诺 ========== */

.page-about .about-commitment {
  position: relative;
  background: linear-gradient(110deg, var(--color-primary) 0%, var(--color-primary-deep) 70%);
  padding: 56px 0 80px;
  overflow: hidden;
}

.page-about .about-commitment::before {
  content: '赛场脉络';
  position: absolute;
  right: -20px;
  bottom: 20px;
  font-family: var(--font-display);
  font-size: clamp(120px, 18vw, 260px);
  font-weight: 800;
  color: rgba(255, 255, 255, 0.03);
  line-height: 1;
  z-index: 0;
  white-space: nowrap;
}

.page-about .about-commitment__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about .about-commitment__copy p {
  font-size: 16px;
  color: var(--color-warm-gray);
  margin: 0 0 14px;
  max-width: 620px;
}

.page-about .about-commitment__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-commitment__contact {
  position: relative;
  background: var(--color-dark);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 420px;
}

.page-about .about-commitment__contact-tag {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-warm);
  margin: 0 0 8px;
}

.page-about .about-commitment__contact h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 16px;
}

.page-about .about-commitment__contact-line {
  font-size: 15px;
  color: var(--color-warm-gray);
  margin: 0 0 8px;
}

.page-about .about-commitment__contact-note {
  font-size: 13px;
  color: var(--color-line-strong);
  margin: 14px 0 20px;
}

/* ========== 桌面端布局增强 ========== */

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-hero__copy {
    flex: 1.15;
  }

  .page-about .about-hero__media {
    flex: 0.85;
  }

  .page-about .about-milestones__grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 56px;
  }

  .page-about .about-milestones__timeline {
    flex: 1;
  }

  .page-about .about-milestones__media {
    flex: 1;
    margin-top: 20px;
  }

  .page-about .about-capability__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .about-capability__media {
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-ecosystem__inner {
    flex-direction: row;
    gap: 64px;
  }

  .page-about .about-ecosystem__copy {
    flex: 1;
  }

  .page-about .about-ecosystem__list {
    flex: 1;
  }

  .page-about .about-commitment__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 64px;
  }

  .page-about .about-commitment__copy {
    flex: 1.1;
  }

  .page-about .about-commitment__contact {
    flex: 0.9;
    margin-top: 8px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-capability__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-capability__card:nth-child(2) {
    transform: translateY(12px);
  }

  .page-about .about-capability__card:nth-child(4) {
    transform: translateY(12px);
  }

  .page-about .about-hero__title {
    font-size: 52px;
  }
}

/* ========== 无障碍：减少动态效果 ========== */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-capability__card,
  .page-about .about-ecosystem__item {
    transition: none;
  }

  .page-about .about-capability__card:nth-child(2),
  .page-about .about-capability__card:nth-child(4) {
    transform: none;
  }

  .page-about .about-ecosystem__item:hover {
    transform: none;
  }

  .page-about .about-hero__photo img {
    transform: none;
  }
}