.page-about {
  --about-tl-line: rgba(245, 197, 66, 0.4);
  --about-tl-end: rgba(18, 59, 103, 0.2);
  --about-border: rgba(232, 237, 245, 0.1);
  --about-dim: rgba(232, 237, 245, 0.72);
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 18px);
  padding-bottom: 0;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: rgba(232, 237, 245, 0.55);
}

.page-about .breadcrumb a {
  color: rgba(232, 237, 245, 0.72);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--c-accent);
  outline: none;
}

/* ---------- 首屏：章节预览 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 34px;
  padding-bottom: 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(232, 237, 245, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 237, 245, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse at 22% 18%, black, transparent 74%);
  mask-image: radial-gradient(ellipse at 22% 18%, black, transparent 74%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero-copy {
  position: relative;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.18;
  margin: 14px 0 18px;
  max-width: 720px;
  color: var(--c-white);
}

.page-about .about-lead {
  font-size: 1.04rem;
  line-height: 1.8;
  color: rgba(232, 237, 245, 0.85);
  max-width: 640px;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 首屏右侧路线卡 ---------- */
.page-about .about-route {
  position: relative;
  border-radius: var(--radius);
  padding: 22px 18px 14px;
  border: 1px solid var(--about-border);
  background: linear-gradient(150deg, rgba(18, 59, 103, 0.62), rgba(6, 14, 32, 0.7));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
}

.page-about .about-route::before {
  content: "";
  position: absolute;
  top: -46px;
  right: -46px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-route-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--c-gold);
  margin: 0 0 8px;
}

.page-about .about-route-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--c-text);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.page-about .about-route-item + .about-route-item {
  box-shadow: inset 0 1px 0 rgba(232, 237, 245, 0.06);
}

.page-about .about-route-item:hover,
.page-about .about-route-item:focus-visible {
  background: rgba(255, 122, 0, 0.08);
  border-color: rgba(255, 122, 0, 0.32);
  outline: none;
  transform: translateX(4px);
}

.page-about .about-route-no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--c-accent);
  width: 28px;
  flex-shrink: 0;
}

.page-about .about-route-label {
  font-size: 0.95rem;
  font-weight: 600;
  min-width: 0;
}

.page-about .about-route-tag {
  margin-left: auto;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: rgba(232, 237, 245, 0.4);
}

/* ---------- 关键数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.page-about .about-stat {
  background: rgba(18, 59, 103, 0.45);
  border: 1px solid rgba(232, 237, 245, 0.08);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: rgba(232, 237, 245, 0.5);
  text-transform: uppercase;
}

.page-about .about-stat-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.7rem;
  line-height: 1.2;
  color: var(--c-accent);
  margin: 2px 0 0;
}

.page-about .about-stat-label {
  font-size: 0.8rem;
  color: rgba(232, 237, 245, 0.65);
  margin: 2px 0 0;
}

/* ---------- 章节标题区 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .about-section-head {
  display: flex;
  flex-direction: column;
  margin-bottom: 28px;
}

.page-about .about-section-head .section-index {
  display: block;
  position: static;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 122, 0, 0.55);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-section-head .section-title {
  margin: 6px 0 10px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-border);
  margin: 0 0 36px;
  max-width: 900px;
}

.page-about .about-timeline-img img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-tl-line), var(--about-tl-end));
}

.page-about .about-milestone {
  position: relative;
  padding-left: 40px;
  padding-bottom: 30px;
}

.page-about .about-milestone:last-child {
  padding-bottom: 0;
}

.page-about .about-milestone::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-accent);
  border: 2px solid var(--c-gold);
  box-shadow: 0 0 0 4px rgba(255, 122, 0, 0.14), 0 0 16px rgba(255, 122, 0, 0.4);
  z-index: 1;
}

.page-about .about-year {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--c-gold);
  letter-spacing: 0.08em;
  display: block;
  line-height: 1.4;
  margin-bottom: 10px;
}

.page-about .about-milestone-card {
  position: relative;
  border-radius: var(--radius);
  padding: 20px 18px;
  border: 1px solid var(--about-border);
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.page-about .about-milestone-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 2px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, transparent, rgba(255, 122, 0, 0.65), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.page-about .about-milestone-card:hover,
.page-about .about-milestone-card:focus-visible {
  border-color: rgba(255, 122, 0, 0.5);
  transform: translateY(-2px);
  background: rgba(255, 122, 0, 0.06);
  outline: none;
}

.page-about .about-milestone-card:hover::before,
.page-about .about-milestone-card:focus-visible::before {
  opacity: 1;
}

.page-about .about-milestone-no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: rgba(232, 237, 245, 0.5);
  display: block;
  margin-bottom: 8px;
}

.page-about .about-milestone-card h3 {
  font-family: var(--font-title);
  font-size: 1.14rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--c-white);
}

.page-about .about-milestone-card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 品牌理念 ---------- */
.page-about .about-philosophy {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-philosophy-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-border);
  max-width: 400px;
  margin: 0;
}

.page-about .about-philosophy-img img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-values {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-value {
  display: grid;
  grid-template-columns: 56px 1fr;
  column-gap: 16px;
  align-items: start;
  padding: 18px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(18, 59, 103, 0.55), rgba(6, 14, 32, 0.6));
  border: 1px solid rgba(232, 237, 245, 0.09);
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.page-about .about-value:hover {
  border-color: rgba(255, 122, 0, 0.4);
  transform: translateY(-2px);
  background: linear-gradient(145deg, rgba(18, 59, 103, 0.75), rgba(6, 14, 32, 0.8));
}

.page-about .about-value-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  padding-top: 4px;
}

.page-about .about-value-body {
  min-width: 0;
}

.page-about .about-value-body h3 {
  font-family: var(--font-title);
  font-size: 1.16rem;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--c-white);
}

.page-about .about-value-body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- TTS-2025 ---------- */
.page-about .about-tts {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-tts-copy > p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(232, 237, 245, 0.85);
}

.page-about .about-tts-modules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-tts-modules li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.32);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-text);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .about-tts-modules li:hover {
  background: rgba(255, 122, 0, 0.14);
  border-color: rgba(255, 122, 0, 0.5);
}

.page-about .about-tts-code {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}

.page-about .about-tts-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-border);
  max-width: 500px;
  margin: 0;
}

.page-about .about-tts-img img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- 团队与运营 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
}

.page-about .about-team-card {
  border-radius: var(--radius);
  padding: 24px 22px;
  border: 1px solid rgba(232, 237, 245, 0.1);
  background: var(--c-tech);
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.page-about .about-team-card:hover {
  border-color: rgba(255, 122, 0, 0.45);
  transform: translateY(-3px);
  background: #155088;
}

.page-about .about-team-card h3 {
  font-family: var(--font-title);
  font-size: 1.18rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--c-white);
  position: relative;
  padding-left: 18px;
}

.page-about .about-team-card h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--c-accent);
  transform: rotate(45deg);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-dim);
  overflow-wrap: anywhere;
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-honor {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  align-items: start;
  padding: 22px 20px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(18, 59, 103, 0.6), rgba(6, 14, 32, 0.72));
  border: 1px solid rgba(245, 197, 66, 0.2);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-honor:hover {
  border-color: rgba(245, 197, 66, 0.45);
  transform: translateY(-2px);
}

.page-about .about-honor-icon {
  color: var(--c-gold);
  font-size: 1rem;
  line-height: 1.6;
}

.page-about .about-honor-body h3 {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--c-white);
}

.page-about .about-honor-body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 底部行动区 ---------- */
.page-about .about-cta {
  padding-top: 8px;
  padding-bottom: 48px;
}

.page-about .about-cta-inner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  padding: 36px 24px 32px;
  text-align: center;
  background:
    radial-gradient(ellipse at 80% 10%, rgba(255, 122, 0, 0.16), transparent 55%),
    linear-gradient(145deg, rgba(18, 59, 103, 0.8), rgba(6, 14, 32, 0.92));
  border: 1px solid rgba(255, 122, 0, 0.25);
}

.page-about .about-cta-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-gold));
}

.page-about .about-cta .section-title {
  margin: 10px 0 12px;
}

.page-about .about-cta-lead {
  max-width: 520px;
  margin: 0 auto;
  color: rgba(232, 237, 245, 0.8);
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面端栅格 ---------- */
@media (min-width: 768px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .about-stat {
    padding: 18px 20px;
  }

  .page-about .about-stat-num {
    font-size: 2rem;
  }

  .page-about .about-section-head {
    display: grid;
    grid-template-columns: 92px 1fr;
    grid-template-rows: auto auto auto;
    column-gap: 28px;
    row-gap: 2px;
  }

  .page-about .about-section-head .section-index {
    grid-column: 1;
    grid-row: 1 / 4;
    align-self: start;
    margin: 2px 0 0;
  }

  .page-about .about-section-head .section-label {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-section-head .section-title {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .about-section-head .section-lead {
    grid-column: 2;
    grid-row: 3;
    max-width: 680px;
  }

  .page-about .about-milestone {
    display: grid;
    grid-template-columns: 180px 64px 1fr;
    padding-left: 0;
    padding-bottom: 36px;
    align-items: start;
  }

  .page-about .about-milestones::before {
    left: 211px;
    top: 20px;
    bottom: 12px;
  }

  .page-about .about-milestone::after {
    left: 205px;
    top: 26px;
  }

  .page-about .about-year {
    text-align: right;
    padding-right: 24px;
    padding-top: 26px;
    margin-bottom: 0;
    font-size: 1.15rem;
    color: var(--c-text);
  }

  .page-about .about-milestone-card {
    max-width: 640px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero-layout {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-philosophy {
    grid-template-columns: 400px 1fr;
    gap: 40px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-honors {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-honor {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (min-width: 960px) {
  .page-about .about-tts {
    grid-template-columns: 1fr 460px;
    gap: 44px;
  }
}