.page-about {
  --about-gold-glow: rgba(212, 175, 55, 0.14);
  --about-cyan-glow: rgba(0, 229, 255, 0.06);
  --about-tl-line: rgba(212, 175, 55, 0.28);
  --about-grid-color: rgba(0, 229, 255, 0.04);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 首屏封面 ===== */
.about-hero {
  position: relative;
  padding: 2rem 0 3rem;
  overflow: hidden;
  background:
    linear-gradient(var(--about-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-color) 1px, transparent 1px);
  background-size: 36px 36px;
}

.about-hero::before {
  content: '';
  position: absolute;
  right: -140px;
  top: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-gold-glow), transparent 68%);
  pointer-events: none;
}

.about-hero .breadcrumb {
  margin-bottom: 2.25rem;
}

.about-hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.about-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 0.35rem 0.7rem;
  margin-bottom: 1.25rem;
}

.about-hero-copy {
  position: relative;
  padding-left: 1.25rem;
}

.about-rotate-note {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  color: rgba(155, 164, 179, 0.5);
  white-space: nowrap;
}

.about-hero-copy .page-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.12;
  color: var(--text-white);
  text-shadow: 0 0 28px rgba(212, 175, 55, 0.16);
}

.about-hero-copy .page-lead {
  margin: 0 0 1.75rem;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-gray);
  max-width: 34em;
}

.about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

.about-hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem 0;
}

.about-hero-visual::before {
  content: '';
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  border: 1px dashed rgba(212, 175, 55, 0.24);
  pointer-events: none;
}

.about-hero-visual::after {
  content: '';
  position: absolute;
  inset: 10%;
  border-radius: 50%;
  border-left: 2px solid rgba(0, 229, 255, 0.2);
  transform: rotate(24deg);
  pointer-events: none;
}

.about-hero-img {
  width: min(280px, 70vw);
  height: auto;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid rgba(212, 175, 55, 0.38);
  box-shadow:
    0 0 48px rgba(212, 175, 55, 0.12),
    inset 0 0 36px rgba(0, 229, 255, 0.05);
}

/* ===== 三列层叠结构 ===== */
.about-cascade {
  display: grid;
  gap: 2.5rem;
  padding: 2.5rem 0 3.5rem;
}

.about-main-col {
  order: 0;
}

.about-timeline-col {
  order: 1;
}

.about-aside-col {
  order: 2;
}

/* ===== 左列时间线 ===== */
.about-col-caption {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
  padding-left: 1.1rem;
}

.about-col-line {
  width: 26px;
  height: 2px;
  background: var(--accent-gold);
  flex-shrink: 0;
}

.about-col-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-white);
  text-transform: uppercase;
}

.about-col-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-gray);
}

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

.about-tl-item {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
}

.about-tl-item::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 20px;
  bottom: -1.1rem;
  width: 1px;
  background: var(--about-tl-line);
}

.about-tl-item:last-child::before {
  display: none;
}

.about-tl-year {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-gold);
}

.about-tl-node {
  position: absolute;
  left: 0;
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #0A1228;
  border: 2px solid var(--accent-gold);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.about-tl-card {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.75rem 0.85rem;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.about-tl-card h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
}

.about-tl-card p {
  margin: 0 0 0.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-gray);
}

.about-tl-card .tag {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.about-tl-item:hover .about-tl-node {
  background: var(--accent-gold);
  box-shadow: 0 0 14px rgba(212, 175, 55, 0.5);
}

.about-tl-card:hover {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 6px 22px rgba(0, 229, 255, 0.07);
  transform: translateX(4px);
}

.about-timeline-figure {
  margin: 1.75rem 0 0;
  padding: 0;
}

.about-timeline-figure img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ===== 中列主内容 ===== */
.about-section {
  margin-bottom: 3rem;
}

.about-section-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.about-section-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-gold);
  background: rgba(212, 175, 55, 0.1);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  flex-shrink: 0;
}

.about-section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-white);
  letter-spacing: 0.02em;
}

.about-section .entry {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-gray);
}

.about-section .entry a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.3);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.about-section .entry a:hover {
  color: var(--text-white);
  border-color: rgba(0, 229, 255, 0.7);
}

.about-team-figure {
  margin: 1.5rem 0;
  padding: 0;
}

.about-team-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--line);
  object-fit: cover;
}

.about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

.about-tech-list li {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: rgba(26, 27, 58, 0.55);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 6px;
  padding: 0.75rem 0.9rem;
}

.about-tech-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-gold);
  white-space: nowrap;
}

.about-tech-label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-gray);
}

.about-qual-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 1.25rem;
}

.about-qual-card {
  position: relative;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(10, 18, 40, 0));
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-gold);
  border-radius: 6px;
  padding: 1.25rem;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.about-qual-card:hover {
  border-color: rgba(212, 175, 55, 0.4);
  transform: translateY(-3px);
}

.about-qual-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent-gold);
  line-height: 1;
}

.about-qual-name {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.45;
}

.about-qual-card .tag {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.68rem;
}

/* ===== 右列数据旁注 ===== */
.about-stats-console {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.about-console-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0.5rem;
}

.about-console-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.about-console-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--text-gray);
}

.about-console-status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 3px;
  padding: 0.12rem 0.35rem;
}

.about-stats-list {
  margin: 0;
}

.about-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--line);
  animation: aboutStatIn 0.6s ease both;
}

.about-stat-row:nth-child(1) { animation-delay: 0.05s; }
.about-stat-row:nth-child(2) { animation-delay: 0.12s; }
.about-stat-row:nth-child(3) { animation-delay: 0.19s; }
.about-stat-row:nth-child(4) { animation-delay: 0.26s; }
.about-stat-row:nth-child(5) { animation-delay: 0.33s; }
.about-stat-row:nth-child(6) { animation-delay: 0.4s; }

.about-stat-row:last-child {
  border-bottom: none;
}

.about-stat-row dt {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text-gray);
}

.about-stat-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.about-aside-note {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: rgba(26, 27, 58, 0.4);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.about-aside-note p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-gray);
}

.about-aside-note a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.3);
}

.about-aside-links {
  margin-top: 1.25rem;
  display: grid;
  gap: 0.5rem;
}

.about-aside-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.9rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-white);
  text-decoration: none;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.about-aside-link:hover {
  background: rgba(212, 175, 55, 0.08);
  border-color: rgba(212, 175, 55, 0.35);
  color: var(--accent-gold);
}

.about-link-arrow {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

@keyframes aboutStatIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 平板及以上 ===== */
@media (min-width: 720px) {
  .about-hero {
    padding: 3rem 0 4.5rem;
  }

  .about-cascade {
    padding: 3.5rem 0 4.5rem;
    gap: 3rem;
  }

  .about-tech-list {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .about-hero-img {
    width: min(340px, 60vw);
  }
}

/* ===== 桌面三列 ===== */
@media (min-width: 1080px) {
  .about-hero {
    padding: 4.5rem 0 5.5rem;
  }

  .about-hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
  }

  .about-rotate-note {
    font-size: 0.7rem;
  }

  .about-hero-img {
    width: min(420px, 100%);
  }

  .about-cascade {
    grid-template-columns: 280px minmax(0, 1fr) 250px;
    gap: 3.2rem;
    align-items: start;
    padding: 4rem 0 5.5rem;
  }

  .about-timeline-col,
  .about-main-col,
  .about-aside-col {
    order: 0;
  }

  .about-tl-item {
    padding-left: 1.75rem;
    margin-bottom: 1.35rem;
  }

  .about-tl-item::before {
    left: 7px;
  }

  .about-tl-node {
    width: 15px;
    height: 15px;
  }

  .about-tl-card {
    padding: 0.9rem 1rem;
  }

  .about-timeline-figure {
    margin-top: 2rem;
  }

  .about-aside-col {
    position: sticky;
    top: 2rem;
  }
}

/* ===== 支持滚动时间线的增强 ===== */
@supports (animation-timeline: view()) {
  .about-stat-row {
    animation-name: aboutStatIn;
    animation-timeline: view();
    animation-range: entry 0% entry 70%;
    animation-duration: 0.6s;
  }
}