.page-about {
  background: var(--primary);
  color: var(--text);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

/* ===== Hero ===== */
.page-about__hero {
  position: relative;
  padding: 2.5rem 0 3rem;
  background:
    radial-gradient(circle at 88% 18%, rgba(255,106,0,0.22), transparent 46%),
    linear-gradient(155deg, var(--primary-dark) 0%, var(--primary) 55%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    112deg,
    transparent 0,
    transparent 28px,
    rgba(242,246,250,0.02) 28px,
    rgba(242,246,250,0.02) 29px
  );
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: -60px;
  top: 26%;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(255,106,0,0.28), transparent 70%);
  border-radius: 50%;
  filter: blur(2px);
}

.page-about__hero .container {
  position: relative;
  z-index: 1;
}

.page-about__hero-layout {
  display: grid;
  gap: 2.2rem;
}

.page-about__hero-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-number);
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1;
  color: var(--primary-dark);
  background: var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.9rem;
  margin-bottom: 1.3rem;
  box-shadow: 0 8px 24px rgba(255,106,0,0.3);
}

.page-about__hero-content h1 {
  margin: 0 0 0.45rem;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.page-about__hero-slogan {
  margin: 0 0 1.2rem;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about__hero-desc {
  margin: 0 0 1.8rem;
  color: var(--muted);
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.95rem;
}

.page-about__hero-stat {
  background: var(--primary-light);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.1rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about__hero-stat:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(6,18,32,0.3);
}

.page-about__hero-stat--lead {
  grid-column: 1 / -1;
  background:
    linear-gradient(135deg, rgba(255,106,0,0.1), transparent 60%),
    var(--primary-light);
}

.page-about__hero-stat-value {
  display: block;
  font-family: var(--font-number);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-about__hero-stat-label {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

/* ===== 本页目录 ===== */
.page-about__toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-top: 2.2rem;
  padding: 0.65rem 0.8rem;
  background: rgba(18,49,72,0.95);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  box-shadow: 0 12px 30px rgba(6,18,32,0.35);
}

.page-about__toc-label {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  margin-right: 0.2rem;
  white-space: nowrap;
}

.page-about__toc a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.8rem;
  transition: background var(--transition), color var(--transition);
}

.page-about__toc a:hover {
  background: var(--accent);
  color: var(--primary-dark);
}

/* ===== 章节通用 ===== */
.page-about__section {
  padding: 3.2rem 0;
}

.page-about__section-heading {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.page-about__section-heading .section-heading__index {
  font-family: var(--font-number);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--accent);
  background: rgba(255,106,0,0.08);
  border: 1px solid rgba(255,106,0,0.35);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.7rem;
  flex: none;
}

.page-about__section-heading .section-heading__title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.page-about__section-heading .section-heading__subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ===== 我们是谁 ===== */
.page-about__who {
  background: linear-gradient(180deg, transparent, rgba(18,49,72,0.3));
}

.page-about__statement {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem;
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.7;
  margin-bottom: 1.8rem;
}

.page-about__statement p {
  margin: 0;
}

.page-about__who-grid {
  display: grid;
  gap: 1.1rem;
}

.page-about__card {
  background: var(--primary-light);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(6,18,32,0.35);
}

.page-about__card-number {
  display: block;
  font-family: var(--font-number);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.page-about__card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  font-weight: 800;
}

.page-about__card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

.page-about__who-note {
  margin-top: 1.3rem;
  padding: 1.1rem 1.2rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
}

.page-about__who-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about__who-note a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.page-about__who-note a:hover {
  text-decoration: underline;
}

/* ===== 成长足迹 ===== */
.page-about__journey {
  background: var(--primary-dark);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about__journey-layout {
  display: grid;
  gap: 1.8rem;
}

.page-about__timeline-wrap {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--primary-light);
  padding-bottom: 0.4rem;
}

.page-about__timeline-wrap::-webkit-scrollbar {
  height: 6px;
}

.page-about__timeline-wrap::-webkit-scrollbar-track {
  background: var(--primary-light);
  border-radius: var(--radius-pill);
}

.page-about__timeline-wrap::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: var(--radius-pill);
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 1rem 0.5rem 1.4rem;
  display: flex;
  gap: 1rem;
  min-width: max-content;
  scroll-snap-type: x mandatory;
}

.page-about__timeline-item {
  position: relative;
  flex: 0 0 280px;
  scroll-snap-align: start;
  padding-top: 2.4rem;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  top: 42px;
  left: 0;
  right: -1rem;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--line) 80%);
  z-index: 0;
}

.page-about__timeline-item:last-child::before {
  right: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent));
}

.page-about__timeline-dot {
  position: absolute;
  top: 35px;
  left: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(255,106,0,0.18), 0 0 18px rgba(255,106,0,0.55);
  z-index: 1;
}

.page-about__timeline-card {
  position: relative;
  background: var(--primary-light);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.3rem;
  min-height: 185px;
  transition: transform var(--transition), border-color var(--transition);
}

.page-about__timeline-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,106,0,0.45);
}

.page-about__timeline-version {
  position: absolute;
  top: 0.7rem;
  right: 1rem;
  font-family: var(--font-number);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(242,246,250,0.09);
  pointer-events: none;
}

.page-about__timeline-card .tag {
  position: relative;
  z-index: 1;
}

.page-about__timeline-card h3 {
  margin: 0.55rem 0 0.5rem;
  padding-right: 2.2rem;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.35;
}

.page-about__timeline-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about__timeline-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-align: center;
}

.page-about__timeline-hint::before,
.page-about__timeline-hint::after {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--line);
}

.page-about__journey-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about__journey-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 核心数据 ===== */
.page-about__data-panel {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 92% 12%, rgba(255,106,0,0.16), transparent 42%),
    linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.3rem;
}

.page-about__data-panel::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--success), var(--accent));
  opacity: 0.45;
}

.page-about__data-layout {
  display: grid;
  gap: 1.4rem;
}

.page-about__data-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about__data-item {
  background: rgba(242,246,250,0.04);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.3rem 1.2rem;
}

.page-about__data-item--wide {
  background: rgba(255,106,0,0.08);
  border-color: rgba(255,106,0,0.35);
}

.page-about__data-value {
  display: block;
  font-family: var(--font-number);
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

.page-about__data-item--wide .page-about__data-value {
  color: var(--accent);
}

.page-about__data-label {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.page-about__data-desc {
  display: block;
  margin-top: 0.45rem;
  color: var(--text);
  font-size: 0.85rem;
  line-height: 1.5;
}

.page-about__data-media {
  position: relative;
  margin: 0;
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about__data-media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
}

.page-about__data-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(6,18,32,0.82);
  padding: 0.7rem 1rem;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--text);
}

/* ===== 团队与技术 ===== */
.page-about__team {
  background: linear-gradient(180deg, transparent, rgba(18,49,72,0.25));
}

.page-about__team-layout {
  display: grid;
  gap: 1.8rem;
}

.page-about__team-lead {
  margin: 0 0 1.4rem;
  font-size: 1.05rem;
  line-height: 1.75;
  font-weight: 500;
}

.page-about__team-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  margin-bottom: 1.4rem;
}

.page-about__team-stat {
  background: var(--primary-light);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 1.1rem 1rem;
}

.page-about__team-num {
  display: block;
  font-family: var(--font-number);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--accent);
}

.page-about__team-label {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.83rem;
}

.page-about__team-details {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(18,49,72,0.6);
  padding: 0.9rem 1.1rem;
  margin-bottom: 1.4rem;
}

.page-about__team-details summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
}

.page-about__team-details div {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.65;
}

.page-about__team-details p {
  margin: 0;
}

.page-about__team-copy > p:not(.page-about__team-lead) {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about__team-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about__team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 资质与荣誉 ===== */
.page-about__honors-grid {
  display: grid;
  gap: 1rem;
}

.page-about__honor-card {
  background: var(--primary-light);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.4rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
}

.page-about__honor-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,106,0,0.4);
}

.page-about__honor-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary-dark);
  font-family: var(--font-number);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 24px rgba(255,106,0,0.35);
  margin-bottom: 0.9rem;
}

.page-about__honor-tag {
  display: inline-flex;
  width: auto;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(255,106,0,0.1);
  border: 1px solid rgba(255,106,0,0.3);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.8rem;
  margin-bottom: 0.9rem;
}

.page-about__honor-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 800;
}

.page-about__honor-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.page-about__honor-card .status-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 0.5rem;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 4px rgba(0,230,118,0.15);
  vertical-align: middle;
  position: relative;
  top: -2px;
}

/* ===== 联系横幅 ===== */
.page-about__contact {
  padding: 2.5rem 0 3rem;
  background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
  border-top: 1px solid var(--line);
}

.page-about__contact-inner {
  text-align: center;
}

.page-about__contact-inner h2 {
  margin: 0 0 0.5rem;
  font-size: 1.55rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about__contact-inner p {
  margin: 0 auto 1.4rem;
  color: var(--muted);
  max-width: 56ch;
}

/* ===== 桌面增强 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 3.2rem 0 3.4rem;
  }

  .page-about__hero-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 2.6rem;
    align-items: center;
  }

  .page-about__hero-stats {
    grid-template-columns: 1fr;
  }

  .page-about__hero-stat--lead {
    grid-column: auto;
  }

  .page-about__hero-stat {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
  }

  .page-about__hero-stat-label {
    margin-top: 0;
    text-align: right;
  }

  .page-about__who-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__data-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__data-item--wide {
    grid-column: span 2;
  }

  .page-about__honors-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .page-about__section {
    padding: 4.5rem 0;
  }

  .page-about__journey-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 2.4rem;
    align-items: start;
  }

  .page-about__journey-media img {
    height: 100%;
    max-height: 520px;
    object-fit: cover;
  }

  .page-about__data-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: stretch;
  }

  .page-about__data-media {
    height: 100%;
    min-height: 100%;
  }

  .page-about__team-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3rem;
    align-items: center;
  }

  .page-about__team-media {
    height: 400px;
  }

  .page-about__team-media img {
    height: 100%;
    object-fit: cover;
  }
}