.page-about {
  position: relative;
  color: var(--text-primary);
  background: var(--bg-deep);
}

/* Hero 区 */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-height) + 44px) 0 48px;
  background:
    radial-gradient(circle at 82% 8%, rgba(245, 197, 24, 0.07), transparent 38%),
    radial-gradient(ellipse at 55% 18%, rgba(26, 35, 126, 0.55), transparent 55%),
    radial-gradient(circle, rgba(255, 255, 255, 0.12) 0.5px, transparent 1px),
    radial-gradient(circle, rgba(245, 197, 24, 0.1) 0.5px, transparent 1px),
    var(--bg-deep);
  background-size: auto, auto, 260px 260px, 340px 340px;
  background-position: 0 0, 0 0, 70px 90px, 210px 260px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-gold) 18%, var(--border-gold) 82%, transparent);
}

.page-about .about-hero .content-container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 36px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-hero-title-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  font-weight: 800;
}

.page-about .about-hero-note {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--gray);
  text-transform: uppercase;
}

.page-about .about-hero-lead {
  margin: 20px 0 0;
  max-width: 640px;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .about-index a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--border-main);
  border-radius: 999px;
  color: var(--text-secondary);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-index a:hover {
  border-color: var(--border-gold);
  color: var(--gold);
  background: rgba(245, 197, 24, 0.06);
}

.page-about .about-hero-figure {
  margin: 0;
  aspect-ratio: 2 / 1;
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-hero-stat {
  padding: 14px 16px;
  border: 1px solid var(--border-main);
  border-radius: var(--radius);
  background: rgba(16, 21, 52, 0.6);
}

.page-about .about-hero-stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--neon);
  line-height: 1.2;
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 0.75rem;
}

/* 章节标题通用 */
.page-about .about-section-head {
  max-width: 720px;
  margin-bottom: 28px;
}

.page-about .about-section-head h2 {
  margin: 14px 0 16px;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  line-height: 1.25;
}

.page-about .about-section-intro {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.75;
}

/* 品牌诞生 */
.page-about .about-origin {
  position: relative;
  padding: 72px 0;
  background: var(--bg-deep);
}

.page-about .about-origin::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 45%;
  height: 100%;
  background: linear-gradient(125deg, transparent 60%, rgba(245, 197, 24, 0.07) 60% 64%, transparent 64%);
  pointer-events: none;
}

.page-about .about-origin .content-container {
  position: relative;
  z-index: 1;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .about-origin-story p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  line-height: 1.85;
}

.page-about .about-origin-story p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin-points {
  display: grid;
  gap: 16px;
}

.page-about .about-point {
  position: relative;
  padding: 20px;
}

.page-about .about-point-index {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--gray);
}

.page-about .about-point h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
}

.page-about .about-point p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* 发展里程碑 */
.page-about .about-milestones {
  padding: 72px 0;
  background:
    radial-gradient(circle at 88% 12%, rgba(26, 35, 126, 0.5), transparent 42%),
    radial-gradient(circle at 5% 85%, rgba(57, 255, 20, 0.04), transparent 34%),
    var(--bg-elevated);
}

.page-about .about-milestone-figure {
  margin: 0;
  aspect-ratio: 2 / 1;
  border: 1px solid var(--border-main);
  box-shadow: var(--shadow);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 36px;
  padding-left: 34px;
}

.page-about .about-timeline-rail {
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--neon));
  opacity: 0.35;
}

.page-about .timeline-item {
  position: relative;
  box-sizing: border-box;
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: aboutTimelineIn 0.7s ease forwards;
}

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

.page-about .timeline-item:nth-child(1) {
  animation-delay: 0.05s;
}

.page-about .timeline-item:nth-child(2) {
  animation-delay: 0.18s;
}

.page-about .timeline-item:nth-child(3) {
  animation-delay: 0.31s;
}

.page-about .timeline-item:nth-child(4) {
  animation-delay: 0.44s;
}

@keyframes aboutTimelineIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .timeline-node {
  position: absolute;
  left: 4px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.12), 0 0 14px rgba(57, 255, 20, 0.5);
}

.page-about .timeline-card {
  padding: 20px;
  border: 1px solid var(--border-main);
  border-left: 2px solid var(--border-gold);
}

.page-about .timeline-card h3 {
  margin: 10px 0 8px;
  font-size: 1.25rem;
}

.page-about .timeline-card > p:not(.timeline-detail) {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .timeline-detail {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.7;
  transition: max-height 0.4s ease, opacity 0.4s ease, margin-top 0.4s ease;
}

.page-about .timeline-card:hover .timeline-detail,
.page-about .timeline-card:focus-within .timeline-detail {
  max-height: 180px;
  margin-top: 10px;
  opacity: 1;
}

/* 理念与愿景 */
.page-about .about-vision {
  padding: 72px 0;
  background:
    radial-gradient(circle at 15% 18%, rgba(26, 35, 126, 0.4), transparent 46%),
    radial-gradient(circle at 88% 80%, rgba(245, 197, 24, 0.05), transparent 38%),
    var(--bg-deep);
}

.page-about .about-vision-grid {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .about-vision-figure {
  margin: 0;
  aspect-ratio: 8 / 5;
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow);
}

.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-principles li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-main);
}

.page-about .about-principles li:last-child {
  border-bottom: 0;
}

.page-about .about-principles-index {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--gold);
  line-height: 1.6;
}

.page-about .about-principles h3 {
  margin: 0 0 6px;
  font-size: 1.0625rem;
}

.page-about .about-principles p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .about-honor {
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px dashed rgba(245, 197, 24, 0.4);
  border-radius: var(--radius);
  background: rgba(245, 197, 24, 0.05);
}

.page-about .about-honor p {
  margin: 8px 0 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 44px;
}

.page-about .about-stat-card {
  padding: 24px 16px;
  text-align: center;
  border-top: 2px solid var(--gold);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(2rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.15;
}

.page-about .about-stat-num span {
  font-size: 0.55em;
  color: var(--text-secondary);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

/* 继续探索 */
.page-about .about-connect {
  position: relative;
  padding: 72px 0 88px;
  background: var(--bg-elevated);
  overflow: hidden;
}

.page-about .about-connect::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 8%;
  width: 46%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  transform: rotate(-7deg);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-connect-card {
  padding: 40px 24px;
  text-align: center;
  border-top: 2px solid var(--neon);
  box-shadow: var(--shadow);
}

.page-about .about-connect-card h2 {
  margin: 14px 0 14px;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-connect-card p {
  margin: 0 auto;
  max-width: 580px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.page-about .about-connect-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 24px;
}

.page-about .about-connect-links .btn {
  min-width: 140px;
}

/* 响应式：移动端优先，逐步增强 */
@media (min-width: 768px) {
  .page-about .about-origin-points {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-timeline {
    padding-left: 0;
  }

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

  .page-about .timeline-item {
    width: 50%;
    margin-bottom: 32px;
    padding-right: 52px;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 52px;
  }

  .page-about .timeline-node {
    top: 24px;
    left: auto;
    right: -5px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-node {
    right: auto;
    left: -5px;
  }

  .page-about .timeline-card {
    border-left: 0;
    border-top: 2px solid var(--border-gold);
  }

  .page-about .timeline-item:nth-child(odd) .timeline-card {
    text-align: right;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    text-align: left;
  }
}

@media (min-width: 992px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: start;
    column-gap: 48px;
  }

  .page-about .about-vision-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    column-gap: 48px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-origin-points {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-item {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

@supports (animation-timeline: view()) {
  .page-about .timeline-item {
    animation: aboutTimelineIn linear both;
    animation-timeline: view();
    animation-range: entry 10% cover 35%;
  }
}