.page-about {
  --declaration-glow: rgba(160, 32, 240, 0.15);
  --timeline-accent: #a020f0;
  --card-flip-speed: 0.45s;
  display: block;
  width: 100%;
}

.page-about .page-about-inner {
  max-width: var(--container-max, 1280px);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .breadcrumb-link {
  color: var(--color-gold, #f0c040);
  text-decoration: none;
  transition: color var(--transition-speed, 0.3s);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--color-gold-hover, #ffd700);
  text-decoration: underline;
}

.page-about .breadcrumb-sep {
  color: var(--color-neon-purple, #a020f0);
  font-weight: 700;
}

.page-about .breadcrumb-current {
  color: var(--color-white, #ffffff);
  font-weight: 600;
}

/* Bento 网格 */
.page-about .about-bento {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

/* 品牌声明大块 */
.page-about .about-declaration {
  background: var(--color-card-bg, rgba(20,30,50,0.8));
  border: var(--border-thick, 4px) solid var(--color-border, #2a3a5a);
  border-radius: var(--radius-card, 8px);
  box-shadow: var(--shadow-strong, 0 8px 24px rgba(0,0,0,0.3));
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .declaration-content {
  position: relative;
  z-index: 2;
}

.page-about .declaration-title {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 2.2rem;
  font-weight: 800;
  font-style: italic;
  line-height: 1.1;
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
  color: var(--color-gold, #f0c040);
}

.page-about .declaration-subtitle {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-neon-purple, #a020f0);
  margin: 0 0 1rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.page-about .declaration-text {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-white, #ffffff);
  max-width: 540px;
  margin-bottom: 1.25rem;
}

.page-about .declaration-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.page-about .trust-badge {
  display: inline-block;
  background: rgba(160, 32, 240, 0.12);
  border: 1px solid var(--color-neon-purple, #a020f0);
  border-radius: 20px;
  padding: 0.3rem 0.9rem;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.8rem;
  color: var(--color-white, #ffffff);
  white-space: nowrap;
}

.page-about .declaration-pulse {
  position: absolute;
  top: -40%;
  right: -20%;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, var(--declaration-glow) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

.page-about .declaration-visual {
  position: relative;
  z-index: 2;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid var(--color-border, #2a3a5a);
}

.page-about .declaration-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 核心能力区域 */
.page-about .about-capabilities {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .capabilities-header {
  padding: 0.5rem 0;
}

.page-about .capabilities-title {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.6rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.35rem;
}

.page-about .capabilities-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
}

.page-about .capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .capability-card {
  background: var(--color-card-bg, rgba(20,30,50,0.8));
  border: var(--border-thick, 4px) solid var(--color-border, #2a3a5a);
  border-radius: var(--radius-card, 8px);
  box-shadow: var(--shadow-strong, 0 8px 24px rgba(0,0,0,0.3));
  padding: 1.25rem;
  position: relative;
  transition: transform var(--transition-speed, 0.3s), box-shadow var(--transition-speed, 0.3s);
  min-height: 160px;
  display: flex;
  flex-direction: column;
}

.page-about .capability-card:hover,
.page-about .capability-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.page-about .capability-front,
.page-about .capability-back {
  flex: 1;
}

.page-about .capability-back {
  display: none;
  align-items: center;
}

.page-about .capability-card[data-hover="flip"] .capability-front {
  display: block;
}

.page-about .capability-card[data-hover="flip"] .capability-back {
  display: none;
}

.page-about .capability-card[data-hover="flip"]:hover .capability-front,
.page-about .capability-card[data-hover="flip"]:focus-within .capability-front {
  display: none;
}

.page-about .capability-card[data-hover="flip"]:hover .capability-back,
.page-about .capability-card[data-hover="flip"]:focus-within .capability-back {
  display: flex;
}

.page-about .capability-icon {
  display: inline-flex;
  width: 36px;
  height: 36px;
  margin-bottom: 0.5rem;
  background: var(--color-neon-purple, #a020f0);
  border-radius: 6px;
  position: relative;
}

.page-about .capability-icon--eval::after {
  content: "⚙";
  font-size: 1.2rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}

.page-about .capability-icon--compare::after {
  content: "⇄";
  font-size: 1.2rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-weight: 700;
}

.page-about .capability-icon--column::after {
  content: "▦";
  font-size: 1.2rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}

.page-about .capability-name {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-gold, #f0c040);
  margin: 0 0 0.35rem;
}

.page-about .capability-brief {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-white, #ffffff);
  margin: 0;
}

.page-about .capability-detail {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-white, #ffffff);
  margin: 0;
}

.page-about .capabilities-deco {
  margin-top: 0.5rem;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid var(--color-border, #2a3a5a);
  align-self: flex-start;
}

.page-about .capabilities-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 数据方法论 */
.page-about .about-methodology {
  margin-top: 1rem;
  margin-bottom: 2.5rem;
}

.page-about .methodology-header {
  margin-bottom: 2rem;
  border-left: 4px solid var(--color-neon-purple, #a020f0);
  padding-left: 1rem;
}

.page-about .methodology-title {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.8rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.35rem;
}

.page-about .methodology-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
}

.page-about .methodology-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
}

.page-about .methodology-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-neon-purple, #a020f0), rgba(160, 32, 240, 0.2));
  border-radius: 1px;
}

.page-about .timeline-node {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  position: relative;
}

.page-about .timeline-marker {
  position: absolute;
  left: -2rem;
  top: 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 18px;
}

.page-about .marker-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-neon-purple, #a020f0);
  border: 2px solid var(--color-bg-start, #0b1a36);
  box-shadow: 0 0 0 3px rgba(160, 32, 240, 0.25);
  z-index: 2;
  flex-shrink: 0;
}

.page-about .marker-line {
  display: none;
}

.page-about .timeline-content {
  background: var(--color-card-bg, rgba(20,30,50,0.8));
  border: 2px solid var(--color-border, #2a3a5a);
  border-radius: var(--radius-card, 8px);
  padding: 1.25rem 1.25rem 1rem;
  flex: 1;
  transition: box-shadow var(--transition-speed, 0.3s);
}

.page-about .timeline-content:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.page-about .timeline-heading {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-gold, #f0c040);
  margin: 0 0 0.4rem;
}

.page-about .timeline-text {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-white, #ffffff);
  margin: 0 0 0.75rem;
}

.page-about .timeline-detail {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.875rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.8);
  padding: 0.75rem 0 0.5rem;
  border-top: 1px solid rgba(160, 32, 240, 0.15);
  margin-top: 0.5rem;
}

.page-about .timeline-detail p {
  margin: 0;
}

.page-about .timeline-toggle {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.8rem;
  padding: 0.3rem 0.8rem;
  background: transparent;
  border: 1px solid var(--color-neon-purple, #a020f0);
  color: var(--color-neon-purple, #a020f0);
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--transition-speed, 0.3s), color var(--transition-speed, 0.3s);
}

.page-about .timeline-toggle:hover,
.page-about .timeline-toggle:focus-visible {
  background: var(--color-neon-purple, #a020f0);
  color: #ffffff;
}

.page-about .methodology-visual {
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid var(--color-border, #2a3a5a);
  margin-top: 1.5rem;
}

.page-about .methodology-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* CTA 区域 */
.page-about .about-cta {
  margin-top: 1rem;
}

.page-about .cta-card {
  background: linear-gradient(135deg, rgba(160, 32, 240, 0.08), rgba(240, 192, 64, 0.06));
  border: var(--border-thick, 4px) solid var(--color-border, #2a3a5a);
  border-radius: var(--radius-card, 8px);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

.page-about .cta-text {
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-white, #ffffff);
  margin: 0;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-bg-start, #0b1a36);
  background: var(--color-gold, #f0c040);
  border: 2px solid var(--color-gold, #f0c040);
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition-speed, 0.3s), transform var(--transition-speed, 0.3s);
  cursor: pointer;
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  background: var(--color-gold-hover, #ffd700);
  border-color: var(--color-gold-hover, #ffd700);
  transform: scale(1.03);
}

.page-about .btn-outline {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-heading, 'Exo 2', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gold, #f0c040);
  background: transparent;
  border: 2px solid var(--color-gold, #f0c040);
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition-speed, 0.3s), color var(--transition-speed, 0.3s), transform var(--transition-speed, 0.3s);
  cursor: pointer;
}

.page-about .btn-outline:hover,
.page-about .btn-outline:focus-visible {
  background: var(--color-gold, #f0c040);
  color: var(--color-bg-start, #0b1a36);
  transform: scale(1.03);
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about .page-about-inner {
    padding: 2rem 2rem 4rem;
  }

  .page-about .about-bento {
    grid-template-columns: 1.3fr 1fr;
    align-items: start;
  }

  .page-about .about-declaration {
    flex-direction: row;
    align-items: flex-start;
    padding: 2.5rem 2rem;
    grid-column: 1 / 2;
    grid-row: 1 / 3;
  }

  .page-about .declaration-content {
    flex: 1;
  }

  .page-about .declaration-visual {
    flex: 0 0 240px;
    margin-left: 1.5rem;
  }

  .page-about .declaration-title {
    font-size: 2.8rem;
  }

  .page-about .declaration-subtitle {
    font-size: 1.2rem;
  }

  .page-about .about-capabilities {
    grid-column: 2 / 3;
    grid-row: 1 / 3;
  }

  .page-about .capabilities-grid {
    grid-template-columns: 1fr;
  }

  .page-about .capabilities-deco {
    align-self: stretch;
  }

  .page-about .capabilities-img {
    width: 100%;
    max-height: 180px;
    object-fit: cover;
  }

  .page-about .methodology-timeline {
    padding-left: 3rem;
  }

  .page-about .timeline-marker {
    left: -3rem;
  }

  .page-about .methodology-visual {
    max-width: 80%;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .cta-card {
    flex-direction: row;
    justify-content: space-between;
    padding: 2rem 3rem;
  }

  .page-about .cta-text {
    font-size: 1.3rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-bento {
    gap: 2rem;
  }

  .page-about .about-declaration {
    padding: 3rem 2.5rem;
  }

  .page-about .declaration-visual {
    flex-basis: 280px;
  }

  .page-about .capabilities-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .capability-card {
    min-height: 180px;
  }

  .page-about .methodology-timeline {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ===== 移动端小屏适配 ===== */
@media (max-width: 480px) {
  .page-about .page-about-inner {
    padding: 1rem 0.75rem 2.5rem;
  }

  .page-about .breadcrumb {
    font-size: 0.75rem;
    flex-wrap: wrap;
  }

  .page-about .declaration-title {
    font-size: 1.6rem;
  }

  .page-about .declaration-trust {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .trust-badge {
    font-size: 0.7rem;
    white-space: normal;
  }

  .page-about .capability-card {
    min-height: 140px;
    padding: 1rem;
  }

  .page-about .methodology-timeline {
    padding-left: 1.5rem;
  }

  .page-about .timeline-marker {
    left: -1.5rem;
    top: 1rem;
  }

  .page-about .marker-dot {
    width: 10px;
    height: 10px;
  }

  .page-about .timeline-content {
    padding: 1rem;
  }

  .page-about .cta-links {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .btn,
  .page-about .btn-outline {
    justify-content: center;
    text-align: center;
  }
}