.page-about {
  --about-panel-bg: rgba(14, 23, 54, 0.72);
  --about-line: rgba(160, 170, 191, 0.1);
  color: var(--color-text);
  background: var(--color-bg);
  position: relative;
}

/* ===== 页面首屏 ===== */
.page-about .about-hero {
  padding: 28px 0 44px;
  position: relative;
  background-image:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-fire) 60%, var(--color-fire-end) 100%);
  opacity: 0.7;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-hero-main h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 4.4rem);
  line-height: 1.05;
  text-transform: uppercase;
  margin: 12px 0 20px;
}

.page-about .about-hero-main h1 em {
  display: block;
  font-style: normal;
  color: var(--color-accent);
}

.page-about .about-hero-desc {
  color: var(--color-text-soft);
  font-size: 1rem;
  line-height: 1.75;
  max-width: 640px;
}

.page-about .about-hero-aside {
  background: var(--about-panel-bg);
  border-left: 3px solid var(--color-accent);
  padding: 14px 16px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .coordinate-label {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--color-meta);
  text-transform: uppercase;
  white-space: nowrap;
}

.page-about .hero-stat-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hero-stat-block .stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  line-height: 1;
}

.page-about .hero-stat-block .stat-label {
  font-size: 0.7rem;
  color: var(--color-meta);
}

/* ===== 章节骨架 ===== */
.page-about .about-section {
  padding: 52px 0 56px;
}

.page-about .section-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .section-index {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1;
  color: var(--color-fire);
  min-width: 50px;
}

.page-about .section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  text-transform: uppercase;
  margin: 0;
  line-height: 1;
}

.page-about .section-annotation {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 10px;
}

/* ===== 品牌理念 ===== */
.page-about .philosophy-section {
  background: linear-gradient(180deg, transparent 0%, rgba(14, 23, 54, 0.35) 100%);
}

.page-about .philosophy-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
}

.page-about .philosophy-quote {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.35;
  color: var(--color-text-soft);
  border-left: 4px solid var(--color-fire);
  padding-left: 16px;
  margin: 0 0 24px;
}

.page-about .philosophy-copy p:not(.philosophy-quote) {
  color: var(--color-meta);
  line-height: 1.75;
  margin: 0 0 14px;
  font-size: 0.95rem;
}

.page-about .philosophy-copy a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .philosophy-image {
  margin: 0;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

/* ===== 发展历程 ===== */
.page-about .timeline-section {
  background-image:
    linear-gradient(rgba(160, 170, 191, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(160, 170, 191, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
}

.page-about .timeline {
  position: relative;
  padding-left: 18px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-fire) 70%, var(--color-fire-end) 100%);
  opacity: 0.6;
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 28px;
  padding-left: 24px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--color-fire);
  transform: rotate(45deg);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.page-about .timeline-year {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--color-accent);
  margin: 0 0 10px;
}

.page-about .timeline-card {
  background: var(--about-panel-bg);
  border-left: 3px solid var(--color-overlay);
  padding: 18px 16px;
  position: relative;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.page-about .timeline-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  border-style: solid;
  border-width: 0 0 14px 14px;
  border-color: transparent transparent rgba(0, 255, 163, 0.25) transparent;
}

.page-about .timeline-card:hover {
  border-left-color: var(--color-accent);
  background: var(--color-overlay);
}

.page-about .timeline-tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid rgba(0, 255, 163, 0.35);
  padding: 3px 8px;
  margin: 0 0 10px;
}

.page-about .timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  text-transform: uppercase;
  margin: 0 0 10px;
}

.page-about .timeline-card p:not(.timeline-tag) {
  color: var(--color-meta);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 内容生态 ===== */
.page-about .ecosystem-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ecosystem-intro {
  font-size: 1rem;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 560px;
}

.page-about .data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .data-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 20px 16px 18px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: transform var(--transition-base), border-color var(--transition-fast);
}

.page-about .data-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 255, 163, 0.45);
}

.page-about .data-card-index {
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--color-meta);
}

.page-about .data-card .stat-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  line-height: 1;
  color: var(--color-accent);
  margin-top: 8px;
}

.page-about .data-card .stat-label {
  font-size: 0.88rem;
  color: var(--color-text-soft);
}

.page-about .data-card p {
  font-size: 0.78rem;
  color: var(--color-meta);
  margin: 4px 0 0;
}

.page-about .ecosystem-map {
  margin: 0;
  position: relative;
}

.page-about .ecosystem-map::before {
  content: "";
  position: absolute;
  top: -8px;
  right: -8px;
  width: 44px;
  height: 44px;
  border-top: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
}

.page-about .ecosystem-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  border-top: 1px solid var(--color-border);
  margin-top: 32px;
  padding-top: 20px;
}

.page-about .catalog-block {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .catalog-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-meta);
  margin-right: 8px;
}

.page-about .catalog-note {
  font-size: 0.88rem;
  color: var(--color-meta);
  line-height: 1.6;
  margin: 0;
  flex-basis: 100%;
}

.page-about .catalog-note a {
  color: var(--color-accent);
  text-underline-offset: 4px;
}

.page-about .philosophy-image img,
.page-about .ecosystem-map img,
.page-about .service-image img {
  display: block;
  width: 100%;
  height: auto;
}

/* ===== 用户服务 ===== */
.page-about .service-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .service-support {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .service-card {
  background: var(--about-panel-bg);
  border-left: 3px solid var(--color-fire);
  padding: 22px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.page-about .service-card:hover {
  border-left-color: var(--color-accent);
  background: var(--color-overlay);
}

.page-about .service-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  text-transform: uppercase;
  margin: 0 0 12px;
}

.page-about .service-card p:not(.timeline-tag) {
  color: var(--color-meta);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0 0 12px;
}

.page-about .service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.page-about .service-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .service-image {
  margin: 0;
}

.page-about .promise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .promise-badge {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 16px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .promise-badge .stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-fire);
}

.page-about .promise-badge .stat-label {
  font-size: 0.72rem;
  color: var(--color-meta);
  line-height: 1.4;
}

/* ===== 品牌关联导航 ===== */
.page-about .about-links {
  padding: 20px 0 72px;
}

.page-about .link-node {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 28px 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
}

.page-about .link-node-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  text-transform: uppercase;
  margin: 8px 0 0;
  color: var(--color-text-soft);
}

.page-about .link-node-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.4fr 0.6fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-hero-aside {
    grid-template-columns: 1fr;
    align-content: start;
    gap: 18px;
    padding: 18px 20px;
  }

  .page-about .coordinate-label {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .hero-stat-block .stat-value {
    font-size: 2rem;
  }

  .page-about .philosophy-layout {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
  }

  .page-about .timeline {
    padding-left: 0;
    max-width: 900px;
  }

  .page-about .timeline::before {
    left: 170px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 170px 1fr;
    gap: 0;
    padding-left: 0;
  }

  .page-about .timeline-item::before {
    left: 163px;
  }

  .page-about .timeline-year {
    padding-right: 36px;
    margin: 0;
    text-align: right;
    font-size: 2.8rem;
  }

  .page-about .timeline-card {
    margin-left: 36px;
  }

  .page-about .ecosystem-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .ecosystem-data {
    padding-top: 8px;
  }

  .page-about .ecosystem-footer {
    flex-wrap: nowrap;
  }

  .page-about .catalog-note {
    flex-basis: auto;
  }

  .page-about .service-layout {
    grid-template-columns: 1fr 0.9fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .link-node {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .section-header {
    gap: 20px;
    margin-bottom: 40px;
  }

  .page-about .section-index {
    font-size: 3rem;
  }

  .page-about .philosophy-layout {
    gap: 64px;
  }

  .page-about .service-layout {
    gap: 56px;
  }

  .page-about .data-grid {
    gap: 18px;
  }

  .page-about .data-card .stat-value {
    font-size: 2.5rem;
  }
}