/* ===== 品牌故事页 ===== */
.page-about {
  --about-gutter: 20px;
  --about-max: 1200px;
  background: var(--bg-deep);
  color: var(--white);
  line-height: 1.6;
}

/* 首屏封面 */
.page-about .about-hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--bg-deep);
  padding: calc(var(--header-h) + 24px) var(--about-gutter) 48px;
}
.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
}
.page-about .about-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.55;
  display: block;
}
.page-about .about-hero-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,31,68,1) 8%, rgba(10,31,68,0.18) 75%), linear-gradient(300deg, rgba(10,31,68,0.9) 0%, transparent 65%);
}
.page-about .about-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--about-max);
  margin-left: auto;
  margin-right: auto;
}
.page-about .about-hero .breadcrumbs {
  margin-bottom: 22px;
  color: var(--silver);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}
.page-about .about-hero .breadcrumbs a {
  color: var(--silver-light);
  text-decoration: none;
  transition: color 0.3s;
}
.page-about .about-hero .breadcrumbs a:hover {
  color: var(--accent);
}
.page-about .about-hero .eyebrow {
  color: var(--accent);
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 8vw, 5.2rem);
  line-height: 0.95;
  margin: 18px 0 20px;
  max-width: 12em;
  color: var(--white);
}
.page-about .about-hero h1 b {
  color: var(--accent);
  font-weight: inherit;
}
.page-about .about-hero .lead {
  color: var(--silver-light);
  max-width: 46em;
  font-size: 1.06rem;
  margin-bottom: 28px;
}
.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 560px;
}
.page-about .hero-stat {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  backdrop-filter: blur(10px);
}
.page-about .hero-stat-value {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.page-about .hero-stat-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--silver);
  margin-top: 4px;
}

/* 章节通用 */
.page-about .about-section {
  padding: 64px var(--about-gutter);
  max-width: var(--about-max);
  margin: 0 auto;
}
.page-about .about-section-head {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-alpha);
  padding-bottom: 18px;
}
.page-about .about-section-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--accent);
  flex-shrink: 0;
  user-select: none;
}
.page-about .about-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.08;
  margin: 6px 0 0;
  color: var(--white);
}
.page-about .about-section .eyebrow {
  color: var(--accent);
}

/* 01 我们的起点 */
.page-about .about-origin-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}
.page-about .about-origin-lead {
  display: grid;
  gap: 16px;
  color: var(--silver-light);
  font-size: 1.02rem;
}
.page-about .about-origin-lead p {
  margin: 0;
  max-width: 70ch;
}
.page-about .about-origin-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-origin-points li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: start;
  background: var(--bg-sea);
  border-radius: var(--radius-lg);
  padding: 18px;
}
.page-about .about-origin-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: var(--white);
  font-family: var(--font-num);
  font-weight: 700;
}
.page-about .about-origin-points strong {
  display: block;
  color: var(--white);
  font-size: 1.05rem;
  margin-bottom: 6px;
}
.page-about .about-origin-points p {
  margin: 0;
  color: var(--silver);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* 02 发展里程碑 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 42px;
  padding-left: 40px;
}
.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent 0%, var(--accent) 4%, var(--border-alpha) 96%);
}
.page-about .timeline-item {
  position: relative;
}
.page-about .timeline-dot {
  position: absolute;
  left: -33px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255,107,0,0.18);
}
.page-about .timeline-year {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 7vw, 2.8rem);
  color: var(--white);
  line-height: 0.9;
  display: inline-block;
  padding: 0 14px 6px 0;
}
.page-about .timeline-card {
  margin-top: 10px;
  background: var(--bg-sea);
  border: 1px solid rgba(255,255,255,0.08);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  transition: transform 0.4s var(--ease), border-color 0.3s var(--ease);
}
.page-about .timeline-item:hover .timeline-card {
  transform: translateY(-4px);
  border-color: rgba(255,107,0,0.5);
}
.page-about .timeline-card h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
  color: var(--white);
}
.page-about .timeline-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--silver-light);
  line-height: 1.6;
}

/* 03 技术底座 */
.page-about .about-tech-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
}
.page-about .about-tech-visual,
.page-about .about-team-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-alpha);
  background: var(--bg-sea);
}
.page-about .about-tech-visual img,
.page-about .about-team-visual img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .about-tech-visual img {
  aspect-ratio: 4 / 3;
}
.page-about .about-team-visual img {
  aspect-ratio: 2 / 1;
}
.page-about .about-tech-copy h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 12px;
  color: var(--white);
}
.page-about .about-tech-copy p {
  color: var(--silver-light);
  margin: 0 0 16px;
}
.page-about .about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-tech-list li {
  position: relative;
  padding-left: 18px;
  color: var(--silver);
  font-size: 0.94rem;
  line-height: 1.5;
}
.page-about .about-tech-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}
.page-about .about-tech-list b {
  color: var(--white);
}
.page-about .about-tech-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-tech-pillars .card {
  position: relative;
  padding: 22px;
  background: var(--bg-sea);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-alpha);
  border-top: 3px solid var(--accent);
  height: 100%;
}
.page-about .about-card-index {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent);
  position: absolute;
  top: 12px;
  right: 16px;
  opacity: 0.9;
}
.page-about .about-tech-pillars h4 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 1.1rem;
}
.page-about .about-tech-pillars p {
  margin: 0;
  color: var(--silver);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* 04 团队与思考 */
.page-about .about-team-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}
.page-about .about-team-copy h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 12px;
  color: var(--white);
}
.page-about .about-team-copy p {
  color: var(--silver-light);
  margin: 0 0 12px;
}
.page-about .about-team-roles {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-team-roles li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 12px;
  align-items: baseline;
  background: rgba(16,42,94,0.5);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}
.page-about .about-team-roles span {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.page-about .about-team-roles p {
  margin: 0;
  color: var(--silver);
  font-size: 0.9rem;
}
.page-about .about-team-quote {
  margin: 36px 0 0;
  padding: 22px 26px;
  background: linear-gradient(135deg, rgba(255,107,0,0.16), var(--bg-sea));
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
}
.page-about .about-team-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  line-height: 1.3;
  margin: 0;
  color: var(--white);
}
.page-about .about-team-quote footer {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--silver);
}
.page-about .about-team-note {
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px dashed var(--border-alpha);
  border-radius: var(--radius-md);
}
.page-about .about-team-note p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--silver);
}

/* 05 延伸阅读 */
.page-about .about-next-links {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
.page-about .about-next-card {
  display: block;
  text-decoration: none;
  background: var(--bg-sea);
  border: 1px solid var(--border-alpha);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.page-about .about-next-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.page-about .about-next-card .tag {
  color: var(--accent);
}
.page-about .about-next-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 14px 0 6px;
  color: var(--white);
}
.page-about .about-next-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--silver);
}

/* 平板及桌面 */
@media (min-width: 768px) {
  .page-about .about-origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .page-about .about-tech-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 40px;
    align-items: center;
  }
  .page-about .about-team-grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 40px;
    align-items: center;
  }
  .page-about .about-next-links {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-tech-pillars {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
}

/* 宽屏桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 100vh;
    padding-bottom: 72px;
  }
  .page-about .about-hero h1 {
    font-size: clamp(3.2rem, 7vw, 5.6rem);
  }
  .page-about .about-hero-stats {
    gap: 14px;
  }
  .page-about .about-next-links {
    grid-template-columns: repeat(4, 1fr);
  }

  /* 时间线中轴交替布局 */
  .page-about .about-timeline {
    padding-left: 0;
  }
  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .timeline-item {
    width: calc(50% - 60px);
  }
  .page-about .timeline-item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }
  .page-about .timeline-item:nth-child(even) {
    margin-left: auto;
    text-align: left;
  }
  .page-about .timeline-dot {
    width: 16px;
    height: 16px;
    top: 12px;
    box-shadow: 0 0 0 5px rgba(255,107,0,0.16);
  }
  .page-about .timeline-item:nth-child(odd) .timeline-dot {
    left: auto;
    right: -52px;
  }
  .page-about .timeline-item:nth-child(even) .timeline-dot {
    left: -52px;
  }
  .page-about .timeline-card {
    border-left-width: 1px;
    border-top: 4px solid var(--accent);
  }
  .page-about .timeline-item:nth-child(odd) .timeline-card {
    border-right: 3px solid var(--accent);
  }
  .page-about .timeline-item:nth-child(even) .timeline-card {
    border-left: 3px solid var(--accent);
  }
  .page-about .timeline-year {
    font-size: clamp(2rem, 4vw, 3rem);
  }
}

@media (max-width: 480px) {
  .page-about .about-hero-stats {
    grid-template-columns: 1fr;
  }
  .page-about .hero-stat {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
  }
  .page-about .hero-stat-value {
    font-size: 1.6rem;
  }
  .page-about .hero-stat-label {
    margin-top: 0;
  }
  .page-about .about-section-head {
    align-items: flex-start;
  }
  .page-about .about-section-number {
    font-size: 1.8rem;
  }
  .page-about .about-team-roles li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .page-about .about-origin-points li {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}