/* ===== 页面专属样式：page-about ===== */
.page-about {
  --about-hero-min-height: 85vh;
  --about-timeline-line-width: 3px;
  --about-card-radius: 12px;
  --about-transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  background-color: var(--bg-dark, #0a0b10);
  color: var(--text-primary, #e0e0e0);
  font-family: var(--font-body, 'Segoe UI', 'Helvetica Neue', sans-serif);
  overflow-x: hidden;
}

/* ----- 阅读进度条 ----- */
.page-about .page-about__progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  z-index: 1000;
  pointer-events: none;
}
.page-about .page-about__progress-fill {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent-gradient, linear-gradient(135deg, #00f5d4 0%, #ff006e 100%));
  transition: width 0.15s ease-out;
}

/* ----- 首屏英雄区 ----- */
.page-about .page-about__hero {
  position: relative;
  min-height: var(--about-hero-min-height, 85vh);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.page-about .page-about__hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .page-about__hero-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  opacity: 0.6;
  filter: saturate(1.4) contrast(1.1);
}
.page-about .page-about__hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem 1.5rem;
  max-width: 960px;
}
.page-about .page-about__breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary, #888899);
}
.page-about .page-about__breadcrumb-link {
  color: var(--primary-cyan, #00f5d4);
  text-decoration: none;
  transition: color var(--transition-speed, 0.3s);
}
.page-about .page-about__breadcrumb-link:hover {
  color: var(--hover-glow, #ff006e);
}
.page-about .page-about__breadcrumb-sep {
  color: var(--text-secondary, #888899);
  font-weight: 300;
}
.page-about .page-about__breadcrumb-current {
  color: var(--text-on-dark, #ffffff);
  font-weight: 600;
}
.page-about .page-about__hero-title {
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(3rem, 12vw, 9rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-on-dark, #ffffff);
  text-shadow: 0 0 20px rgba(0, 245, 212, 0.5), 0 0 60px rgba(0, 245, 212, 0.2);
  margin: 0 0 0.3em;
  line-height: 1;
  position: relative;
  animation: page-about-glitch 4s infinite alternate;
}
@keyframes page-about-glitch {
  0%, 90%, 100% { transform: translate(0); text-shadow: 0 0 20px rgba(0, 245, 212, 0.5), 0 0 60px rgba(0, 245, 212, 0.2); }
  92% { transform: translate(-3px, 1px); text-shadow: -4px 0 #ff006e, 4px 0 #00f5d4; }
  94% { transform: translate(3px, -1px); text-shadow: 4px 0 #ff006e, -4px 0 #00f5d4; }
  96% { transform: translate(-1px, 2px); text-shadow: -2px 0 #00f5d4, 2px 0 #ff006e; }
  98% { transform: translate(1px, -2px); text-shadow: 2px 0 #00f5d4, -2px 0 #ff006e; }
}
.page-about .page-about__hero-sub {
  font-family: var(--font-body, 'Segoe UI', sans-serif);
  font-size: clamp(1rem, 2.5vw, 1.6rem);
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--primary-cyan, #00f5d4);
  margin: 0;
  opacity: 0.9;
}

/* ----- 通用章节标题 ----- */
.page-about .page-about__section-heading {
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-on-dark, #ffffff);
  margin: 0 0 1.2rem;
  position: relative;
  display: inline-block;
}
.page-about .page-about__section-heading::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--accent-gradient, linear-gradient(135deg, #00f5d4 0%, #ff006e 100%));
  margin-top: 0.5rem;
  border-radius: 2px;
}

/* ----- 品牌定位 ----- */
.page-about .page-about__mission {
  padding: 5rem 0;
  background-color: var(--bg-section, #12131a);
}
.page-about .page-about__mission-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
.page-about .page-about__mission-body {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.page-about .page-about__mission-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-primary, #e0e0e0);
  margin: 0;
  max-width: 68ch;
}
.page-about .page-about__mission-visual {
  border-radius: var(--about-card-radius);
  overflow: hidden;
  border: var(--border-neon, 1px solid rgba(0, 245, 212, 0.3));
  box-shadow: 0 0 30px rgba(0, 245, 212, 0.08);
}
.page-about .page-about__mission-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  object-position: center;
  transition: transform 0.6s ease;
}
.page-about .page-about__mission-img:hover {
  transform: scale(1.02);
}

/* ----- 版本档案时间轴 ----- */
.page-about .page-about__archive {
  padding: 5rem 0;
  position: relative;
  background-color: var(--bg-dark, #0a0b10);
}
.page-about .page-about__archive-intro {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary, #888899);
  margin: 0 0 3rem;
  max-width: 58ch;
}
.page-about .page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding-left: 1.5rem;
}
.page-about .page-about__timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0.75rem;
  width: var(--about-timeline-line-width);
  background: linear-gradient(to bottom, #00f5d4, #ff006e, #00f5d4);
  border-radius: 2px;
  opacity: 0.4;
}
.page-about .page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: start;
  transition: opacity var(--about-transition);
}
.page-about .page-about__timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  min-width: 80px;
}
.page-about .page-about__timeline-dot {
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-magenta, #ff006e);
  box-shadow: 0 0 16px rgba(255, 0, 110, 0.6);
  border: 2px solid var(--bg-dark, #0a0b10);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about .page-about__timeline-item:hover .page-about__timeline-dot {
  transform: scale(1.25);
  box-shadow: 0 0 28px rgba(255, 0, 110, 0.9);
}
.page-about .page-about__timeline-version {
  font-family: var(--font-code, 'Courier New', monospace);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-cyan, #00f5d4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.page-about .page-about__timeline-card {
  background: var(--card-bg, rgba(18, 19, 26, 0.8));
  border: var(--border-neon, 1px solid rgba(0, 245, 212, 0.3));
  border-radius: var(--about-card-radius);
  backdrop-filter: blur(6px);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  overflow: hidden;
}
.page-about .page-about__timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 245, 212, 0.12), 0 0 0 1px rgba(0, 245, 212, 0.15);
}
.page-about .page-about__timeline-card-inner {
  display: flex;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  align-items: flex-start;
}
.page-about .page-about__timeline-img {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid rgba(0, 245, 212, 0.15);
}
.page-about .page-about__timeline-card-body {
  flex: 1;
}
.page-about .page-about__timeline-heading {
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-on-dark, #ffffff);
  margin: 0 0 0.5rem;
}
.page-about .page-about__timeline-text {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary, #e0e0e0);
  margin: 0;
  max-width: 55ch;
}

/* ----- 技术承诺 ----- */
.page-about .page-about__commitment {
  padding: 5rem 0;
  background-color: var(--bg-section, #12131a);
  position: relative;
}
.page-about .page-about__commitment::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-cyan, #00f5d4), var(--primary-magenta, #ff006e), transparent);
}
.page-about .page-about__commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
  margin-top: 2rem;
}
.page-about .page-about__commitment-card {
  background: var(--card-bg, rgba(18, 19, 26, 0.8));
  border: var(--border-neon, 1px solid rgba(0, 245, 212, 0.3));
  border-radius: var(--about-card-radius);
  padding: 2rem 1.8rem;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  text-align: center;
}
.page-about .page-about__commitment-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(255, 0, 110, 0.12), 0 0 0 1px rgba(255, 0, 110, 0.2);
  border-color: rgba(255, 0, 110, 0.4);
}
.page-about .page-about__commitment-icon {
  color: var(--primary-cyan, #00f5d4);
  margin-bottom: 1rem;
  display: inline-flex;
  transition: color var(--about-transition);
}
.page-about .page-about__commitment-card:hover .page-about__commitment-icon {
  color: var(--primary-magenta, #ff006e);
}
.page-about .page-about__commitment-title {
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: 1.3rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-on-dark, #ffffff);
  margin: 0 0 0.8rem;
}
.page-about .page-about__commitment-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-primary, #e0e0e0);
  margin: 0;
}

/* ----- CTA 区域 ----- */
.page-about .page-about__cta {
  padding: 4rem 0;
  background-color: var(--bg-dark, #0a0b10);
}
.page-about .page-about__cta-box {
  background: var(--card-bg, rgba(18, 19, 26, 0.8));
  border: var(--border-neon, 1px solid rgba(0, 245, 212, 0.3));
  border-radius: var(--about-card-radius);
  padding: 3rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-about .page-about__cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(0, 245, 212, 0.04), transparent 60%);
  pointer-events: none;
}
.page-about .page-about__cta-heading {
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.6rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-on-dark, #ffffff);
  margin: 0 0 1rem;
}
.page-about .page-about__cta-text {
  font-size: 1.05rem;
  color: var(--text-secondary, #888899);
  margin: 0 0 2rem;
}
.page-about .page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.page-about .btn-outline-cyan {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-cyan, #00f5d4);
  background: transparent;
  border: 2px solid var(--primary-cyan, #00f5d4);
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition-speed, 0.3s), color var(--transition-speed, 0.3s), box-shadow var(--transition-speed, 0.3s);
  cursor: pointer;
}
.page-about .btn-outline-cyan:hover {
  background: var(--primary-cyan, #00f5d4);
  color: var(--bg-dark, #0a0b10);
  box-shadow: 0 0 24px rgba(0, 245, 212, 0.35);
}
.page-about .btn-magenta {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  font-family: var(--font-heading, 'Arial Black', 'Impact', sans-serif);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-on-dark, #ffffff);
  background: var(--primary-magenta, #ff006e);
  border: 2px solid var(--primary-magenta, #ff006e);
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition-speed, 0.3s), box-shadow var(--transition-speed, 0.3s);
  cursor: pointer;
}
.page-about .btn-magenta:hover {
  background: #cc0059;
  box-shadow: 0 0 28px rgba(255, 0, 110, 0.45);
}

/* ----- container 复用 ----- */
.page-about .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.2rem;
}

/* ----- 移动端优先 576px+ ----- */
@media (min-width: 576px) {
  .page-about .page-about__timeline {
    padding-left: 2.5rem;
  }
  .page-about .page-about__timeline-line {
    left: 1.5rem;
  }
  .page-about .page-about__timeline-marker {
    min-width: 100px;
  }
  .page-about .page-about__timeline-card-inner {
    padding: 1.5rem 2rem;
  }
  .page-about .page-about__timeline-img {
    width: 100px;
    height: 100px;
  }
  .page-about .page-about__commitment-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .page-about__mission-inner {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .page-about__cta-box {
    padding: 4rem 3rem;
  }
}

/* ----- 桌面端 992px+ ----- */
@media (min-width: 992px) {
  .page-about .page-about__hero-title {
    font-size: clamp(5rem, 10vw, 10rem);
  }
  .page-about .page-about__timeline {
    padding-left: 4rem;
  }
  .page-about .page-about__timeline-line {
    left: 2.5rem;
  }
  .page-about .page-about__timeline-marker {
    min-width: 120px;
  }
  .page-about .page-about__commitment-grid {
    gap: 2.5rem;
  }
  .page-about .page-about__section-heading {
    font-size: clamp(2.4rem, 4vw, 3.8rem);
  }
}

/* ----- 超大屏 1400px+ ----- */
@media (min-width: 1400px) {
  .page-about .container {
    max-width: 1320px;
    padding: 0 2rem;
  }
  .page-about .page-about__mission-text {
    font-size: 1.15rem;
  }
}

/* ----- 交互增强：悬停浮窗提示（data-hover-tooltip） ----- */
.page-about [data-hover-tooltip] {
  position: relative;
  cursor: default;
}
.page-about [data-hover-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  background: var(--card-bg, rgba(18, 19, 26, 0.95));
  color: var(--text-on-dark, #ffffff);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: var(--font-body, 'Segoe UI', sans-serif);
  white-space: nowrap;
  border: 1px solid rgba(0, 245, 212, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 100;
}
.page-about [data-hover-tooltip]:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

/* ----- 时间轴节点滚动高亮（data-scroll-section） ----- */
.page-about [data-scroll-section] {
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about [data-scroll-section]:not(.in-view) {
  opacity: 0.6;
  transform: translateY(20px);
}
.page-about [data-scroll-section].in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ----- 确保所有图片响应式 ----- */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* ----- 卡片通用微交互动画 ----- */
.page-about .card {
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}
.page-about .card:hover {
  transform: translateY(-3px);
}
</main>