.page-about {
  background: var(--c-deep);
  color: var(--c-text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 24px;
  padding-bottom: 12px;
  font-size: 14px;
  color: var(--c-text-dim);
}

.page-about .breadcrumb a {
  color: var(--c-text-dim);
  text-decoration: none;
  transition: color var(--dur-fast) ease;
}

.page-about .breadcrumb a:hover {
  color: var(--c-orange);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-orange);
  font-weight: 600;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  opacity: 0.45;
}

/* ---------- 首屏 Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 6vw, 72px) 0 clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -18%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(155, 77, 255, 0.22) 0%, transparent 60%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -160px;
  bottom: -80px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(255, 106, 0, 0.14) 0%, transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__content {
  max-width: 680px;
}

.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(30px, 5vw, 58px);
  line-height: 1.16;
  margin: 16px 0 20px;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.72;
  color: var(--c-text-dim);
  max-width: 600px;
  margin: 0;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__media {
  position: relative;
  width: 100%;
}

.page-about .about-hero__media-shape {
  position: absolute;
  inset: 14px -10px -10px 14px;
  background: linear-gradient(135deg, var(--c-orange), var(--c-purple));
  clip-path: polygon(10% 0, 100% 0, 90% 100%, 0 100%);
  opacity: 0.4;
}

.page-about .about-hero__frame {
  position: relative;
  z-index: 1;
  overflow: hidden;
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
  background: var(--c-ship);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05);
}

/* ---------- 品牌时间轴 ---------- */
.page-about .about-journey {
  position: relative;
  padding-top: clamp(56px, 9vw, 104px);
}

.page-about .about-journey::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-purple), transparent);
  opacity: 0.28;
}

.page-about .journey-timeline {
  position: relative;
  margin-top: clamp(28px, 5vw, 56px);
  padding-left: 44px;
}

.page-about .journey-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 99px;
  background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-purple) 58%, var(--c-cyan) 100%);
  opacity: 0.85;
}

.page-about .journey-item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .journey-item:last-child {
  margin-bottom: 0;
}

.page-about .journey-item__dot {
  position: absolute;
  left: 8px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 0, 0.14), 0 0 18px rgba(255, 106, 0, 0.35);
  z-index: 1;
}

.page-about .journey-item__card {
  background: linear-gradient(135deg, rgba(27, 35, 64, 0.92), rgba(19, 26, 58, 0.72));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--c-orange);
  border-radius: var(--radius-panel);
  padding: 22px 24px;
  transition: transform var(--dur-slow) var(--ease-out), box-shadow var(--dur-slow) var(--ease-out);
}

.page-about .journey-item__card:hover,
.page-about .journey-item__card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
}

.page-about .journey-item__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-orange);
  background: rgba(255, 106, 0, 0.12);
  border: 1px solid rgba(255, 106, 0, 0.22);
  padding: 4px 12px;
  border-radius: var(--radius-cap);
}

.page-about .journey-item__card h3 {
  font-family: var(--font-headline);
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.3;
  margin: 14px 0 8px;
}

.page-about .journey-item__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-text-dim);
}

/* ---------- 双版本同源架构 ---------- */
.page-about .about-architecture {
  position: relative;
  padding: clamp(64px, 10vw, 120px) 0;
  background: linear-gradient(180deg, rgba(11, 16, 38, 0) 0%, rgba(19, 26, 58, 0.55) 18%, rgba(19, 26, 58, 0.55) 82%, rgba(11, 16, 38, 0) 100%);
}

.page-about .arch-grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.page-about .arch-copy__lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-text);
  margin: 16px 0 0;
}

.page-about .arch-points {
  list-style: none;
  padding: 0;
  margin: 24px 0 28px;
}

.page-about .arch-points li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--c-text-dim);
}

.page-about .arch-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--c-purple);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(155, 77, 255, 0.35);
}

.page-about .arch-media .image-frame {
  max-width: 520px;
  margin-left: auto;
}

/* ---------- 数据驱动观赛 ---------- */
.page-about .about-data {
  position: relative;
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-data::before {
  content: "";
  position: absolute;
  top: 10%;
  right: -200px;
  width: 520px;
  height: 520px;
  background: conic-gradient(from 120deg, rgba(255, 106, 0, 0.08), rgba(155, 77, 255, 0.1), rgba(0, 255, 170, 0.06), rgba(255, 106, 0, 0.08));
  border-radius: 50%;
  pointer-events: none;
}

.page-about .section-head__meta {
  margin-top: 14px;
}

.page-about .data-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

.page-about .data-feature {
  position: relative;
  padding: 26px 24px 24px;
  background: linear-gradient(135deg, rgba(27, 35, 64, 0.85), rgba(19, 26, 58, 0.7));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-panel);
  overflow: hidden;
  transition: transform var(--dur-slow) var(--ease-out), border-color var(--dur-fast) ease;
}

.page-about .data-feature::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--c-orange), var(--c-purple));
}

.page-about .data-feature:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 106, 0, 0.25);
}

.page-about .data-feature__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .data-feature h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  line-height: 1.3;
  margin: 12px 0 8px;
}

.page-about .data-feature p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--c-text-dim);
}

.page-about .data-band {
  position: relative;
  margin-top: 28px;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
}

.page-about .data-band img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 用户规模与生态 ---------- */
.page-about .about-stats {
  position: relative;
  padding: clamp(56px, 9vw, 104px) 0;
  background: radial-gradient(ellipse at 82% 0%, rgba(155, 77, 255, 0.1), transparent 48%), linear-gradient(180deg, rgba(19, 26, 58, 0.35), rgba(11, 16, 38, 0));
}

.page-about .stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 36px;
}

.page-about .stat-item {
  position: relative;
  padding: 28px 16px 24px;
  text-align: center;
  background: rgba(19, 26, 58, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-panel);
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

.page-about .stat-item:hover {
  border-color: rgba(155, 77, 255, 0.32);
  background: rgba(27, 35, 64, 0.72);
}

.page-about .stat-item--highlight {
  border-color: rgba(255, 106, 0, 0.32);
  background: linear-gradient(135deg, rgba(255, 106, 0, 0.1), rgba(27, 35, 64, 0.7));
}

.page-about .stat-item--highlight:hover {
  border-color: rgba(255, 106, 0, 0.58);
}

.page-about .stat-item__num {
  display: block;
  font-family: var(--font-headline);
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.1;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-item__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-text-dim);
}

.page-about .stats-cta {
  margin-top: 28px;
  padding: 26px 24px;
  border-radius: var(--radius-card);
  background: linear-gradient(120deg, rgba(255, 106, 0, 0.08), rgba(155, 77, 255, 0.08));
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .stats-cta__copy h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  margin: 0 0 10px;
}

.page-about .stats-cta__copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

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

/* ---------- 平板 / 桌面端 ---------- */
@media (min-width: 740px) {
  .page-about .stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

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

  .page-about .stats-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .stats-cta__copy {
    max-width: 640px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-bottom: 96px;
  }

  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .arch-grid {
    grid-template-columns: 1fr 1fr;
    gap: 72px;
  }

  .page-about .data-features {
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
  }

  .page-about .journey-timeline {
    padding-left: 0;
  }

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

  .page-about .journey-item {
    width: 50%;
    padding-right: 56px;
    margin-bottom: 44px;
  }

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

  .page-about .journey-item__dot {
    left: auto;
    right: -7px;
    top: 24px;
  }

  .page-about .journey-item:nth-child(even) .journey-item__dot {
    left: -7px;
    right: auto;
  }

  .page-about .journey-item__card {
    padding: 26px 28px;
  }
}