.page-about {
  --about-grid-line: rgba(255, 255, 255, 0.05);
  --about-grid-line-dark: rgba(10, 31, 68, 0.06);
}

/* ===== 首屏：错位色块叙事 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(135deg, var(--bd-primary) 0%, var(--bd-primary-alt) 55%, var(--bd-primary) 100%);
  background-size: 44px 44px, 44px 44px, auto;
  padding: 52px 0 112px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -8%;
  right: -18%;
  width: 72%;
  height: 120%;
  background: linear-gradient(160deg, var(--bd-accent) 0%, var(--bd-accent-alt) 100%);
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
  transform: rotate(-4deg);
  z-index: 1;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-breadcrumb {
  margin-bottom: 36px;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
  padding-top: 20px;
}

.page-about .about-hero-main {
  max-width: 720px;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  font-family: var(--bd-font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bd-accent-alt);
  border: 1px solid rgba(255, 107, 53, 0.6);
  padding: 6px 14px;
  margin-bottom: 22px;
  transform: skewX(-6deg);
}

.page-about .about-hero h1 {
  font-family: var(--bd-font-display);
  font-size: var(--bd-size-hero);
  line-height: 0.98;
  color: #fff;
  margin: 0 0 20px;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
  max-width: 620px;
  margin: 0 0 32px;
}

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

.page-about .about-hero .bd-btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
  background: transparent;
}

.page-about .about-hero-side {
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .about-hero-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-radius: 16px 4px 16px 4px;
  padding: 24px 20px;
  color: #fff;
  box-shadow: var(--bd-shadow-md);
}

.page-about .about-hero-card-accent {
  background: rgba(10, 31, 68, 0.72);
  border-color: rgba(255, 255, 255, 0.28);
}

.page-about .about-hero-card-label {
  display: block;
  font-family: var(--bd-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bd-accent-alt);
  margin-bottom: 10px;
}

.page-about .about-hero-card-num {
  font-family: var(--bd-font-mono);
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1;
  color: #fff;
  display: inline-block;
  vertical-align: middle;
}

.page-about .about-hero-card-unit {
  font-family: var(--bd-font-mono);
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.65);
  margin-left: 6px;
}

.page-about .about-hero-card-desc {
  display: block;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 8px;
}

.page-about .about-hero-card-flags {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-hero-card-flag {
  font-family: var(--bd-font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  background: var(--bd-accent);
  padding: 4px 12px;
  transform: skewX(-8deg);
  display: inline-block;
}

.page-about .about-hero-slash {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 72px;
  background: var(--bd-light);
  clip-path: polygon(0 100%, 100% 68%, 100% 100%, 0 100%);
  z-index: 1;
}

/* ===== 章节标题头 ===== */
.page-about .about-section-head {
  margin-bottom: 44px;
  max-width: 760px;
}

.page-about .about-section-index {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--bd-font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--bd-accent);
  text-transform: uppercase;
}

.page-about .about-section-index::after {
  content: "";
  display: block;
  width: 52px;
  height: 3px;
  background: linear-gradient(90deg, var(--bd-accent) 0%, rgba(255, 107, 53, 0.15) 100%);
}

.page-about .about-section-head h2 {
  font-family: var(--bd-font-display);
  font-size: var(--bd-size-h2);
  line-height: 1.05;
  color: var(--bd-primary);
  margin: 12px 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.page-about .about-section-desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: rgba(30, 41, 59, 0.68);
  margin: 0;
}

/* ===== 01 品牌起源 ===== */
.page-about .about-origin {
  background: var(--bd-light);
  position: relative;
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.page-about .about-origin-copy p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--bd-dark);
  margin-bottom: 18px;
}

.page-about .about-origin-copy strong {
  color: var(--bd-primary);
  font-weight: 700;
}

.page-about .about-origin-panel {
  background: #fff;
  border: 1px solid rgba(51, 65, 85, 0.12);
  border-radius: 20px 4px 20px 4px;
  box-shadow: var(--bd-shadow-md);
  padding: 28px 24px 24px;
  position: relative;
  overflow: hidden;
}

.page-about .about-origin-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  width: 60px;
  height: 4px;
  background: var(--bd-accent);
  border-radius: 0 0 8px 8px;
}

.page-about .about-console-card {
  display: grid;
  gap: 14px;
}

.page-about .about-console-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  border-bottom: 1px dashed rgba(51, 65, 85, 0.15);
  padding-bottom: 10px;
}

.page-about .about-console-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-console-label {
  font-family: var(--bd-font-mono);
  font-size: 0.8125rem;
  color: var(--bd-border);
  letter-spacing: 0.06em;
}

.page-about .about-console-value {
  font-family: var(--bd-font-mono);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--bd-primary);
  text-align: right;
}

.page-about .about-origin-note {
  margin-top: 18px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(30, 41, 59, 0.65);
  background: rgba(255, 107, 53, 0.08);
  border-left: 3px solid var(--bd-accent);
  padding: 12px 14px;
}

/* ===== 02 发展里程碑 ===== */
.page-about .about-milestone {
  background:
    radial-gradient(ellipse at 80% 10%, rgba(255, 107, 53, 0.18) 0%, transparent 52%),
    linear-gradient(160deg, var(--bd-primary) 0%, var(--bd-night) 100%);
  color: #fff;
}

.page-about .about-milestone .about-section-head h2 {
  color: #fff;
}

.page-about .about-milestone .about-section-desc {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-milestone .about-section-index {
  color: var(--bd-accent-alt);
}

.page-about .about-milestone .about-section-index::after {
  background: linear-gradient(90deg, var(--bd-accent-alt), rgba(255, 107, 53, 0.2));
}

.page-about .about-milestone-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--bd-accent) 0%, rgba(255, 255, 255, 0.15) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 36px 24px;
}

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

.page-about .about-timeline-dot {
  position: absolute;
  left: -26px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--bd-accent);
  border-radius: 50%;
  border: 3px solid var(--bd-primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.35);
}

.page-about .about-timeline-content {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px 2px 14px 2px;
  padding: 20px 22px;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.page-about .about-timeline-content:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 107, 53, 0.55);
}

.page-about .about-timeline-tag {
  margin-bottom: 10px;
  display: inline-flex;
}

.page-about .about-timeline-content h3 {
  font-family: var(--bd-font-display);
  font-size: 1.375rem;
  margin: 0 0 8px;
  color: #fff;
}

.page-about .about-timeline-content p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.68);
  margin: 0;
}

.page-about .about-milestone-media {
  position: relative;
}

.page-about .about-media-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 20px 4px 20px 4px;
  box-shadow: var(--bd-shadow-lg);
}

.page-about .about-milestone-caption {
  display: block;
  margin-top: 14px;
  font-family: var(--bd-font-mono);
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.08em;
}

.page-about .about-milestone-more {
  margin-top: 40px;
}

/* ===== 03 技术理念 ===== */
.page-about .about-technology {
  background: #fff;
}

.page-about .about-tech-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-tech-copy {
  display: grid;
  gap: 20px;
}

.page-about .about-tech-card {
  background: var(--bd-light);
  border-left: 4px solid var(--bd-accent);
  border-radius: 4px 16px 16px 4px;
  padding: 26px 24px;
}

.page-about .about-tech-num {
  font-family: var(--bd-font-display);
  font-size: 2.25rem;
  line-height: 1;
  color: rgba(255, 107, 53, 0.35);
  display: block;
  margin-bottom: 8px;
}

.page-about .about-tech-card h3 {
  font-family: var(--bd-font-display);
  font-size: 1.25rem;
  margin: 0 0 8px;
  color: var(--bd-primary);
}

.page-about .about-tech-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(30, 41, 59, 0.74);
  margin: 0;
}

.page-about .about-tech-media {
  position: relative;
}

.page-about .about-tech-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border-radius: 4px 20px 4px 20px;
  box-shadow: var(--bd-shadow-md);
}

.page-about .about-tech-quote {
  font-family: var(--bd-font-display);
  font-size: 1.375rem;
  line-height: 1.5;
  color: var(--bd-primary);
  border-left: 4px solid var(--bd-accent);
  padding-left: 16px;
  margin: 20px 0 0;
}

/* ===== 04 服务承诺 ===== */
.page-about .about-commitment {
  background:
    linear-gradient(var(--about-grid-line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line-dark) 1px, transparent 1px),
    linear-gradient(150deg, var(--bd-accent) 0%, var(--bd-accent-alt) 100%);
  background-size: 44px 44px, 44px 44px, auto;
  color: #fff;
}

.page-about .about-commitment-banner {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
  border-radius: 24px 6px 24px 6px;
  box-shadow: var(--bd-shadow-lg);
  margin-bottom: 48px;
}

.page-about .about-commitment-head h2 {
  color: #fff;
}

.page-about .about-commitment-head .about-section-desc {
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-commitment .about-section-index {
  color: var(--bd-primary);
}

.page-about .about-commitment .about-section-index::after {
  background: linear-gradient(90deg, var(--bd-primary), rgba(10, 31, 68, 0.2));
}

.page-about .about-commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 40px;
}

.page-about .about-commitment-card {
  background: var(--bd-primary);
  border-radius: 20px 4px 20px 4px;
  padding: 28px 24px;
  border-top: 4px solid #fff;
  box-shadow: var(--bd-shadow-md);
}

.page-about .about-commitment-num {
  font-family: var(--bd-font-mono);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  color: var(--bd-accent);
  display: block;
  margin-bottom: 12px;
}

.page-about .about-commitment-card h3 {
  font-family: var(--bd-font-display);
  font-size: 1.25rem;
  color: #fff;
  margin: 0 0 8px;
}

.page-about .about-commitment-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
  word-break: break-word;
}

.page-about .about-commitment-foot {
  margin-top: 40px;
}

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 132px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
    padding-top: 40px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
  }

  .page-about .about-milestone-layout {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about .about-tech-layout {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about .about-commitment-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
  }

  .page-about .about-commitment-foot {
    margin-top: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 86vh;
  }

  .page-about .about-hero-card {
    padding: 32px;
  }

  .page-about .about-milestone-layout,
  .page-about .about-tech-layout {
    gap: 88px;
  }

  .page-about .about-hero-lead {
    font-size: 1.125rem;
  }
}