.page-about {
  --tl-line-color: linear-gradient(180deg, #8a2be2, #00ff87);
  --tl-dot-size: 18px;
  --tl-line-width: 3px;
  --card-bg: rgba(10, 31, 61, 0.65);
  --card-border: 1px solid rgba(138, 43, 226, 0.35);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 2rem;
  padding-bottom: 1rem;
  font-size: 0.85rem;
  color: var(--clr-mid-gray, #888);
}
.page-about .breadcrumb a {
  color: var(--clr-light-gray, #e0e0e0);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.page-about .breadcrumb a:hover {
  color: var(--clr-bright-orange, #ff7a00);
}
.page-about .breadcrumb-sep {
  margin: 0 0.25rem;
  color: var(--clr-mid-gray, #888);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--clr-white, #fff);
  font-weight: 500;
}

/* 首屏 — 左右分屏 */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 1rem;
  padding-bottom: 3rem;
  position: relative;
}
.page-about .about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 30%, rgba(138,43,226,0.12), transparent 70%);
  pointer-events: none;
}
.page-about .about-hero-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
}
.page-about .about-brand-graphic {
  width: 200px;
  height: 200px;
  object-fit: contain;
  border-radius: var(--border-radius, 6px);
  background: rgba(138,43,226,0.08);
  padding: 0.5rem;
}
.page-about .about-brand-name {
  font-family: var(--font-head, 'Inter','Noto Sans SC',sans-serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--clr-bright-orange, #ff7a00);
  margin: 0;
  letter-spacing: 0.05em;
  text-shadow: 0 0 20px rgba(255,122,0,0.25);
}
.page-about .about-brand-tagline {
  font-size: 1rem;
  color: var(--clr-light-gray, #e0e0e0);
  margin: 0;
  padding: 0.4rem 1rem;
  border-left: 3px solid var(--clr-electric-purple, #8a2be2);
  border-right: 3px solid var(--clr-electric-purple, #8a2be2);
  display: inline-block;
  letter-spacing: 0.08em;
}
.page-about .about-hero-right {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem 1rem;
  background: var(--card-bg);
  border: var(--card-border);
  border-radius: var(--border-radius, 6px);
  position: relative;
}
.page-about .about-hero-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--clr-mid-gray, #888);
  margin: 0 0 0.25rem;
  text-align: center;
}

/* 时间轴预览 (首屏右侧) */
.page-about .timeline-preview {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  padding-left: 2rem;
}
.page-about .timeline-preview::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: var(--tl-line-width);
  background: var(--tl-line-color);
  border-radius: 4px;
}
.page-about .tp-node {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  position: relative;
}
.page-about .tp-dot {
  flex-shrink: 0;
  width: var(--tl-dot-size);
  height: var(--tl-dot-size);
  border-radius: 50%;
  background: var(--clr-electric-purple, #8a2be2);
  border: 3px solid var(--clr-deep-blue, #0a1f3d);
  box-shadow: 0 0 0 2px var(--clr-cyber-green, #00ff87);
  margin-top: 0.2rem;
  position: relative;
  z-index: 1;
}
.page-about .tp-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.page-about .tp-text strong {
  font-size: 1rem;
  color: var(--clr-white, #fff);
  font-weight: 600;
}
.page-about .tp-text span {
  font-size: 0.85rem;
  color: var(--clr-light-gray, #e0e0e0);
  line-height: 1.4;
}
.page-about .about-cta {
  align-self: center;
  margin-top: 0.5rem;
}

/* 品牌理念 */
.page-about .about-philosophy {
  padding-top: 3rem;
  padding-bottom: 3rem;
}
.page-about .philosophy-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .philosophy-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .section-label {
  font-family: var(--font-head, 'Inter','Noto Sans SC',sans-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--clr-bright-orange, #ff7a00);
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--clr-electric-purple, #8a2be2);
  display: inline-block;
}
.page-about .philosophy-main {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--clr-light-gray, #e0e0e0);
  margin: 0;
}
.page-about .philosophy-main strong {
  color: var(--clr-cyber-green, #00ff87);
  font-weight: 600;
}
.page-about .philosophy-sub {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--clr-mid-gray, #888);
  margin: 0;
}
.page-about .philosophy-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .philosophy-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--border-radius, 6px);
  border: var(--card-border);
  background: var(--card-bg);
}

/* 平台功能概览 — 时间轴 */
.page-about .about-timeline {
  padding-top: 3rem;
  padding-bottom: 3rem;
  position: relative;
}
.page-about .about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(0,255,135,0.06), transparent 70%);
  pointer-events: none;
}
.page-about .timeline-intro {
  font-size: 0.95rem;
  color: var(--clr-light-gray, #e0e0e0);
  margin: 0.5rem 0 2rem;
  max-width: 640px;
}
.page-about .timeline-track {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 2.8rem;
}
.page-about .timeline-track::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 28px;
  bottom: 28px;
  width: var(--tl-line-width);
  background: var(--tl-line-color);
  border-radius: 4px;
}
.page-about .timeline-node {
  background: var(--card-bg);
  border: var(--card-border);
  border-radius: var(--border-radius, 6px);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: box-shadow var(--transition, 0.25s ease);
}
.page-about .timeline-node:hover {
  box-shadow: 0 4px 24px rgba(138,43,226,0.15);
}
.page-about .timeline-node[open] .tl-arrow {
  transform: rotate(180deg);
}
.page-about .timeline-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem 0.9rem 1.8rem;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: background var(--transition, 0.25s ease);
}
.page-about .timeline-header::-webkit-details-marker {
  display: none;
}
.page-about .timeline-header:hover {
  background: rgba(138,43,226,0.08);
}
.page-about .tl-dot {
  position: absolute;
  left: -2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--clr-electric-purple, #8a2be2);
  border: 3px solid var(--clr-deep-blue, #0a1f3d);
  box-shadow: 0 0 0 2px var(--clr-cyber-green, #00ff87);
  flex-shrink: 0;
}
.page-about .tl-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 1rem;
  color: var(--clr-cyber-green, #00ff87);
  font-weight: 500;
  min-width: 1.8rem;
}
.page-about .tl-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--clr-white, #fff);
  flex: 1;
}
.page-about .tl-arrow {
  font-size: 0.85rem;
  color: var(--clr-mid-gray, #888);
  transition: transform var(--transition, 0.25s ease);
}
.page-about .tl-detail {
  padding: 0 1.2rem 1.2rem 1.8rem;
  color: var(--clr-light-gray, #e0e0e0);
  font-size: 0.92rem;
  line-height: 1.65;
}
.page-about .tl-detail p {
  margin: 0 0 0.75rem;
}
.page-about .tl-link {
  color: var(--clr-bright-orange, #ff7a00);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition, 0.25s ease);
}
.page-about .tl-link:hover {
  color: var(--clr-cyber-green, #00ff87);
  text-decoration: underline;
}
.page-about .timeline-illustration {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
}
.page-about .timeline-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--border-radius, 6px);
  border: var(--card-border);
  background: var(--card-bg);
}

/* 数据优势 */
.page-about .about-data {
  padding-top: 3rem;
  padding-bottom: 3rem;
}
.page-about .data-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .data-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .data-main {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-light-gray, #e0e0e0);
  margin: 0;
}
.page-about .data-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-about .data-list li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--clr-light-gray, #e0e0e0);
  font-size: 0.92rem;
}
.page-about .data-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--clr-cyber-green, #00ff87);
  font-weight: 700;
}
.page-about .data-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .data-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--border-radius, 6px);
  border: var(--card-border);
  background: var(--card-bg);
}
.page-about .btn-secondary {
  background: transparent;
  border: 2px solid var(--clr-bright-orange, #ff7a00);
  color: var(--clr-bright-orange, #ff7a00);
}
.page-about .btn-secondary:hover {
  background: var(--clr-bright-orange, #ff7a00);
  color: var(--clr-deep-blue, #0a1f3d);
}

/* 联系与信任 */
.page-about .about-connect {
  padding-top: 2rem;
  padding-bottom: 4rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.page-about .connect-slogan {
  font-size: 1rem;
  color: var(--clr-mid-gray, #888);
  max-width: 600px;
  margin: 0;
  border-top: 1px solid rgba(138,43,226,0.25);
  padding-top: 2rem;
}
.page-about .connect-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* 按钮基础样式（页面专属微调） */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.6rem;
  font-family: var(--font-sans, 'Inter','Noto Sans SC',sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--clr-bright-orange, #ff7a00);
  color: var(--clr-deep-blue, #0a1f3d);
  border: none;
  border-radius: var(--border-radius, 6px);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}
.page-about .btn:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 20px rgba(255,122,0,0.25);
}
.page-about .btn-secondary:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 20px rgba(255,122,0,0.15);
}

/* ========== 桌面端媒体查询 ========== */
@media (min-width: 768px) {
  .page-about .about-hero {
    flex-direction: row;
    align-items: stretch;
    gap: 3rem;
    padding-top: 1.5rem;
    padding-bottom: 4rem;
  }
  .page-about .about-hero-left {
    flex: 0 0 38%;
    justify-content: center;
    gap: 1.2rem;
    border-right: 1px solid rgba(138,43,226,0.2);
    padding-right: 2rem;
  }
  .page-about .about-brand-graphic {
    width: 280px;
    height: 280px;
  }
  .page-about .about-brand-name {
    font-size: 3rem;
  }
  .page-about .about-brand-tagline {
    font-size: 1.1rem;
  }
  .page-about .about-hero-right {
    flex: 1;
    justify-content: center;
    padding: 2rem 2rem;
  }
  .page-about .about-hero-label {
    text-align: left;
  }
  .page-about .about-cta {
    align-self: flex-start;
  }

  .page-about .philosophy-grid {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about .philosophy-text {
    flex: 1.2;
  }
  .page-about .philosophy-visual {
    flex: 1;
  }
  .page-about .section-label {
    font-size: 1.8rem;
  }

  .page-about .timeline-track {
    padding-left: 3.2rem;
  }
  .page-about .tl-dot {
    left: -2.4rem;
    width: 18px;
    height: 18px;
  }
  .page-about .tl-detail {
    padding-left: 2.2rem;
  }

  .page-about .data-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about .data-text {
    flex: 1.1;
  }
  .page-about .data-visual {
    flex: 1;
  }

  .page-about .about-timeline::before {
    width: 300px;
    height: 300px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-left {
    flex: 0 0 36%;
  }
  .page-about .about-brand-name {
    font-size: 3.6rem;
  }
  .page-about .about-brand-graphic {
    width: 320px;
    height: 320px;
  }
}