.page-about {
  --about-accent: #00FF88;
  --about-deep: #071627;
  --about-panel: #12304D;
  --about-muted: #8FAEC8;
  --about-text: #E6F2FF;
  --about-border: rgba(0, 255, 136, 0.35);
  --about-bg: #0B1E3A;
  --about-alert: #FF5733;
  --about-soft: #B4FF4D;
  position: relative;
  background: var(--about-bg);
  color: var(--about-text);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  padding-bottom: 0;
}

.page-about a {
  color: inherit;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px var(--gutter) 0;
}

.page-about .about-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--about-muted);
}

.page-about .about-breadcrumb li + li::before {
  content: "→";
  margin-right: 8px;
  color: var(--about-accent);
}

.page-about .about-breadcrumb a {
  color: var(--about-text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus {
  color: var(--about-accent);
}

.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--about-accent);
}

/* ===== 首屏英雄区 ===== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  min-height: 76vh;
  display: flex;
  align-items: center;
  padding: 96px var(--gutter) 64px;
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-hero-mask {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, rgba(3, 15, 26, 0.96) 0%, rgba(3, 15, 26, 0.82) 42%, rgba(3, 15, 26, 0.38) 82%);
}

.page-about .about-hero-deco {
  position: absolute;
  bottom: -30px;
  left: 0;
  width: 100%;
  height: 120px;
  background: linear-gradient(115deg, transparent 0 72%, rgba(0, 255, 136, 0.28) 72% 100%);
  transform: skewY(-3deg);
  z-index: -1;
}

.page-about .about-hero-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
}

.page-about .about-hero-kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 14px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.2em;
  color: var(--about-deep);
  background: var(--about-accent);
  text-transform: uppercase;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(40px, 8vw, 84px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--about-text);
}

.page-about .about-hero-line {
  color: var(--about-accent);
}

.page-about .about-hero-summary {
  max-width: 46ch;
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(230, 242, 255, 0.85);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-side {
  display: none;
  position: absolute;
  right: 24px;
  top: 50%;
  z-index: 2;
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(0, 255, 136, 0.55);
}

/* ===== 主体布局 ===== */
.page-about .about-layout {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-content {
  min-width: 0;
}

/* ===== 章节目录 ===== */
.page-about .about-toc {
  position: static;
  padding: 28px 0 8px;
  margin-bottom: 8px;
}

.page-about .about-toc-note {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--about-muted);
}

.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-item a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--about-muted);
  text-decoration: none;
  border-left: 2px solid rgba(0, 255, 136, 0.28);
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-toc-num {
  color: var(--about-accent);
  font-weight: 900;
  font-family: var(--font-display);
}

.page-about .about-toc-item a:hover,
.page-about .about-toc-item a:focus {
  color: var(--about-text);
  border-left-color: var(--about-accent);
  background: rgba(0, 255, 136, 0.06);
}

/* ===== 章节区块 ===== */
.page-about .about-block {
  padding: 72px 0;
  border-bottom: 1px solid rgba(0, 255, 136, 0.14);
}

.page-about .about-block-dark {
  background: var(--about-deep);
  margin: 0 calc(var(--gutter) * -1);
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  border-left: 2px solid rgba(0, 255, 136, 0.3);
  border-bottom-color: rgba(0, 255, 136, 0.14);
}

.page-about .about-block-head {
  margin-bottom: 24px;
}

.page-about .section-kicker {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-accent);
  border: 1px solid rgba(0, 255, 136, 0.35);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-block h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .about-lead-text {
  max-width: 68ch;
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.72;
  color: rgba(230, 242, 255, 0.86);
}

.page-about .about-copy p {
  margin: 0 0 16px;
  max-width: 68ch;
  line-height: 1.75;
  color: rgba(230, 242, 255, 0.9);
}

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

/* ===== 事实数据网格 ===== */
.page-about .about-fact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-fact {
  position: relative;
  padding: 20px 16px;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.06) 0%, transparent 70%);
  border: 1px solid rgba(0, 255, 136, 0.22);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 900;
  color: var(--about-accent);
  line-height: 1;
}

.page-about .about-fact-label {
  font-size: 13px;
  color: var(--about-muted);
}

/* ===== 里程碑与时间线 ===== */
.page-about .about-milestone-media {
  margin: 12px 0 36px;
  border: 1px solid rgba(0, 255, 136, 0.35);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .about-timeline {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 4px 22px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline-card {
  position: relative;
  flex: 0 0 min(260px, 80vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 20px 20px;
  background: var(--about-panel);
  border-left: 2px solid var(--about-accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  min-height: 190px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline-card:hover,
.page-about .about-timeline-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.35);
}

.page-about .about-timeline-badge {
  align-self: flex-start;
  padding: 3px 8px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--about-deep);
  background: var(--about-accent);
}

.page-about .about-timeline-time {
  font-size: 13px;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--about-muted);
  text-transform: uppercase;
}

.page-about .about-timeline-card h3 {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  line-height: 1.2;
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(230, 242, 255, 0.82);
}

/* ===== 技术架构 ===== */
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 28px 0 34px;
}

.page-about .about-tech-card {
  position: relative;
  padding: 22px 20px 20px;
  background: rgba(18, 48, 77, 0.55);
  border: 1px solid rgba(143, 174, 200, 0.22);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-tech-card:hover,
.page-about .about-tech-card:focus-within {
  border-color: rgba(0, 255, 136, 0.5);
  transform: translateY(-2px);
}

.page-about .about-tech-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 900;
  color: var(--about-soft);
  line-height: 1;
}

.page-about .about-tech-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .about-tech-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(230, 242, 255, 0.82);
}

/* ===== 数据条 ===== */
.page-about .about-data-bars {
  display: grid;
  gap: 18px;
}

.page-about .about-data-bar-item {
  display: grid;
  gap: 6px;
}

.page-about .about-data-bar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
  color: var(--about-muted);
}

.page-about .about-data-bar-head span:last-child {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--about-accent);
  white-space: nowrap;
}

.page-about .data-bar {
  height: 8px;
  background: rgba(143, 174, 200, 0.15);
  overflow: hidden;
  transform: skewX(-20deg);
}

.page-about .data-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--about-accent), var(--about-soft));
}

/* ===== 团队与生态 ===== */
.page-about .about-team-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
  max-width: 68ch;
  line-height: 1.72;
  color: rgba(230, 242, 255, 0.9);
}

.page-about .about-eco-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-eco-list li {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--about-accent);
  border: 1px solid rgba(0, 255, 136, 0.35);
  background: rgba(0, 255, 136, 0.05);
}

.page-about .about-team-media {
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
  overflow: hidden;
  border: 1px solid rgba(0, 255, 136, 0.25);
}

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

/* ===== 服务承诺 ===== */
.page-about .about-promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-promise-card {
  position: relative;
  padding: 26px 22px 22px;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.06), transparent 65%);
  border: 1px solid rgba(0, 255, 136, 0.25);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .about-promise-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 28px;
  height: 2px;
  background: var(--about-accent);
}

.page-about .about-promise-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
}

.page-about .about-promise-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(230, 242, 255, 0.82);
}

/* ===== CTA 区域 ===== */
.page-about .about-cta {
  margin-top: 42px;
  padding: 28px 24px;
  border: 1px solid rgba(0, 255, 136, 0.3);
  background: linear-gradient(120deg, rgba(0, 255, 136, 0.09), transparent 60%);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  max-width: 34ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== 按钮 ===== */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-deep);
  background: var(--about-accent);
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

.page-about .btn:hover,
.page-about .btn:focus {
  background: var(--about-soft);
  transform: translateY(-1px);
}

.page-about .btn-outline {
  color: var(--about-accent);
  background: transparent;
  border-color: rgba(0, 255, 136, 0.45);
}

.page-about .btn-outline:hover,
.page-about .btn-outline:focus {
  background: rgba(0, 255, 136, 0.1);
  color: var(--about-accent);
}

/* ===== 底部信任带 ===== */
.page-about .about-trust {
  padding: 44px var(--gutter);
  background: var(--about-deep);
  border-top: 1px solid rgba(0, 255, 136, 0.25);
}

.page-about .about-trust-inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--about-muted);
}

.page-about .about-trust-inner p {
  margin: 0;
  max-width: 56ch;
  line-height: 1.6;
}

.page-about .about-trust-inner span {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--about-accent);
}

/* ===== 平板与桌面增强 ===== */
@media (min-width: 768px) {
  .page-about .about-fact-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .about-team-wrap {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .page-about .about-cta-actions {
    gap: 12px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 82vh;
    padding-top: 110px;
    padding-bottom: 80px;
  }

  .page-about .about-hero-side {
    display: block;
  }

  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 120px;
    align-self: start;
    padding: 56px 0 0;
    margin: 0;
  }

  .page-about .about-toc-list {
    display: block;
  }

  .page-about .about-toc-item a {
    display: flex;
    padding: 9px 12px;
    font-size: 14px;
  }

  .page-about .about-block {
    padding: 80px 0;
  }

  .page-about .about-block-dark {
    margin: 0;
    padding-left: 36px;
    padding-right: 36px;
  }

  .page-about .about-timeline-card {
    flex-basis: 270px;
  }
}