.page-about {
  --about-deep: #0A1F44;
  --about-gold: #D4AF37;
  --about-gold-light: #F1D27A;
  --about-red: #E63946;
  --about-cloud: #F5F7FA;
  --about-border: #D8DEE9;
  --about-text: #1E2A38;
  --about-muted: #5A6B7B;

  background: var(--about-cloud);
  color: var(--about-text);
  overflow-x: hidden;
}

/* ========== Hero / 首屏 ========== */
.about-hero {
  position: relative;
  overflow: hidden;
  background: var(--about-deep);
  color: #FFFFFF;
  padding: 36px 0 64px;
}

.about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--about-gold) 0%, rgba(212, 175, 55, 0) 60%);
}

.about-hero::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  top: -140px;
  right: -100px;
  border: 1px solid rgba(212, 175, 55, 0.25);
  transform: rotate(45deg);
  pointer-events: none;
}

.about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: 32px;
}

.about-hero .breadcrumb-link {
  color: rgba(255, 255, 255, 0.72);
}

.about-hero .breadcrumb-link:hover {
  color: var(--about-gold);
}

.about-hero .breadcrumb-item {
  color: var(--about-gold-light);
}

.about-hero .breadcrumb-sep {
  margin: 0 8px;
  color: rgba(255, 255, 255, 0.5);
}

.about-hero-copy {
  position: relative;
  z-index: 1;
}

.about-kicker {
  display: block;
  font-family: var(--font-index);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--about-gold);
  margin-bottom: 16px;
}

.about-title {
  font-family: var(--font-heading);
  font-size: 32px;
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: 0.01em;
  margin-bottom: 16px;
}

.about-lead {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 20px;
  max-width: 660px;
}

.about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.about-hero .tag {
  background: rgba(212, 175, 55, 0.12);
  border-color: rgba(212, 175, 55, 0.4);
  color: var(--about-gold-light);
}

.about-hero-aside {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-top: 28px;
}

.about-hero-num {
  font-family: var(--font-index);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-gold);
}

.about-hero-unit {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.75);
  padding-left: 12px;
  border-left: 1px solid rgba(212, 175, 55, 0.4);
}

/* ========== 章节公共 ========== */
.about-index {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--about-gold);
  border: 1px solid rgba(212, 175, 55, 0.5);
  padding: 4px 10px;
  margin-bottom: 14px;
}

.about-origin h2,
.about-milestones h2,
.about-stats h2,
.about-promise h2 {
  font-size: 30px;
  line-height: 1.3;
  margin-bottom: 12px;
}

.about-section-lead {
  color: var(--about-muted);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 640px;
}

/* ========== 品牌起源 ========== */
.about-origin {
  background: #FFFFFF;
  padding: 64px 0;
  border-bottom: 1px solid var(--about-border);
}

.about-origin-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.about-origin-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  margin-bottom: 16px;
}

.about-origin-copy blockquote {
  margin: 20px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--about-gold);
  background: var(--about-cloud);
  color: var(--about-deep);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.7;
}

.about-origin-figure {
  margin: 0;
}

.about-origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.9) contrast(1.05);
}

.about-origin-figure figcaption {
  font-size: 13px;
  color: var(--about-muted);
  padding-top: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-border);
}

/* ========== 发展里程碑 ========== */
.about-milestones {
  background: var(--about-cloud);
  padding: 64px 0;
}

.milestone-rail {
  position: relative;
  margin-top: 40px;
  padding-left: 32px;
}

.milestone-rail::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-gold), rgba(212, 175, 55, 0.2));
}

.milestone-item {
  position: relative;
  margin-bottom: 28px;
}

.milestone-item:last-child {
  margin-bottom: 0;
}

.milestone-dot {
  position: absolute;
  left: -32px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-deep);
  border: 3px solid var(--about-gold);
  box-shadow: 0 0 0 4px var(--about-cloud);
}

.milestone-card {
  background: #FFFFFF;
  border: 1px solid var(--about-border);
  border-left: 3px solid var(--about-gold);
  padding: 18px 18px 16px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.milestone-phase {
  display: block;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.milestone-card h3 {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--about-deep);
}

.milestone-card > p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-text);
  margin-bottom: 8px;
}

.milestone-detail {
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-muted);
  border-top: 1px dashed var(--about-border);
  padding-top: 10px;
  margin-top: 10px;
  margin-bottom: 0 !important;
}

/* ========== 数据与规模 ========== */
.about-stats {
  position: relative;
  overflow: hidden;
  background: var(--about-deep);
  color: #FFFFFF;
  padding: 64px 0;
}

.about-stats-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
}

.about-stats .container {
  position: relative;
  z-index: 2;
}

.about-stats .about-index {
  border-color: rgba(212, 175, 55, 0.6);
}

.about-stats h2 {
  color: #FFFFFF;
}

.about-stats .about-section-lead {
  color: rgba(255, 255, 255, 0.8);
}

.about-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
}

.about-stat-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(212, 175, 55, 0.28);
  padding: 20px 14px;
  transition: background 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
}

.about-stat-num {
  display: block;
  font-family: var(--font-index);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--about-gold);
}

.about-stat-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-top: 6px;
  line-height: 1.4;
}

.about-stat-source {
  display: block;
  font-size: 12px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 6px;
}

.about-stats-note {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(212, 175, 55, 0.3);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
}

/* ========== 品牌承诺 ========== */
.about-promise {
  background: #FFFFFF;
  padding: 64px 0;
}

.about-promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 28px;
}

.about-promise-card {
  position: relative;
  border: 1px solid var(--about-border);
  background: #FBFCFE;
  padding: 24px 20px 20px;
  transition: border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.about-promise-num {
  display: block;
  font-family: var(--font-index);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-gold);
  margin-bottom: 12px;
}

.about-promise-card h3 {
  font-size: 18px;
  font-weight: 800;
  color: var(--about-deep);
  margin-bottom: 8px;
}

.about-promise-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
  margin-bottom: 0;
}

.about-promise-lower {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 32px;
  align-items: center;
}

.about-promise-figure {
  margin: 0;
}

.about-promise-figure img {
  display: block;
  width: 100%;
  height: auto;
  filter: contrast(1.08) saturate(0.9);
}

.about-promise-figure figcaption {
  font-size: 13px;
  color: var(--about-muted);
  padding-top: 10px;
}

.about-cta {
  position: relative;
  overflow: hidden;
  background: var(--about-deep);
  color: #FFFFFF;
  padding: 32px 24px;
}

.about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 90px;
  height: 90px;
  border-top: 2px solid var(--about-gold);
  border-right: 2px solid var(--about-gold);
  opacity: 0.6;
}

.about-cta-mark {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--about-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.5);
  padding-bottom: 6px;
  margin-bottom: 16px;
}

.about-cta p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 24px;
}

.about-cta-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.about-cta .btn-outline {
  border-color: rgba(212, 175, 55, 0.7);
  color: var(--about-gold-light);
}

.about-cta .btn-outline:hover {
  background: rgba(212, 175, 55, 0.12);
  color: #FFFFFF;
}

/* ========== 微交互 ========== */
@media (hover: hover) and (pointer: fine) {
  .milestone-card:hover,
  .milestone-card:focus-within {
    transform: translateY(-4px);
    border-color: var(--about-gold);
    box-shadow: 0 12px 28px rgba(10, 31, 68, 0.1);
  }

  .about-stat-item:hover,
  .about-stat-item:focus {
    background: rgba(212, 175, 55, 0.12);
    transform: translateY(-3px);
  }

  .about-promise-card:hover {
    border-color: var(--about-gold);
    background: #FFFFFF;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(10, 31, 68, 0.06);
  }
}

/* ========== 桌面端 ========== */
@media (min-width: 900px) {
  .about-hero {
    padding: 64px 0 96px;
  }

  .about-hero::after {
    width: 420px;
    height: 420px;
    top: -210px;
    right: -120px;
  }

  .about-hero-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 48px;
    align-items: end;
  }

  .about-title {
    font-size: 46px;
    max-width: 760px;
  }

  .about-lead {
    font-size: 17px;
  }

  .about-hero-aside {
    justify-content: flex-end;
    text-align: right;
    margin-top: 0;
  }

  .about-hero-num {
    font-size: 120px;
  }

  .about-hero-unit {
    writing-mode: vertical-rl;
    border-left: 0;
    border-right: 1px solid rgba(212, 175, 55, 0.4);
    padding-left: 0;
    padding-right: 12px;
    margin-right: 6px;
    font-size: 14px;
  }

  .about-origin,
  .about-milestones,
  .about-stats,
  .about-promise {
    padding: 96px 0;
  }

  .about-origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .about-origin-copy p {
    font-size: 16px;
  }

  .about-index {
    margin-bottom: 18px;
  }

  .about-origin h2,
  .about-milestones h2,
  .about-stats h2,
  .about-promise h2 {
    font-size: 38px;
  }

  .about-section-lead {
    font-size: 16px;
    margin-bottom: 40px;
  }

  /* 时间线桌面布局 */
  .milestone-rail {
    padding-left: 0;
    margin-top: 56px;
    max-width: 980px;
    margin-left: auto;
    margin-right: auto;
  }

  .milestone-rail::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .milestone-item {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    margin-bottom: 40px;
    align-items: start;
  }

  .milestone-item:last-child {
    margin-bottom: 0;
  }

  .milestone-dot {
    position: relative;
    left: 0;
    top: 22px;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    width: 14px;
    height: 14px;
    box-shadow: 0 0 0 5px var(--about-cloud);
  }

  .milestone-card {
    grid-column: 3;
    grid-row: 1;
    padding: 22px 24px;
  }

  .milestone-item:nth-child(even) .milestone-card {
    grid-column: 1;
    text-align: right;
    border-left: 1px solid var(--about-border);
    border-right: 3px solid var(--about-gold);
  }

  @media (hover: hover) and (pointer: fine) {
    .milestone-item:nth-child(even) .milestone-card:hover,
    .milestone-item:nth-child(even) .milestone-card:focus-within {
      border-left-color: var(--about-border);
      border-right-color: var(--about-gold);
    }
  }

  /* 数据区块桌面布局 */
  .about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .about-stat-item {
    padding: 28px 22px;
  }

  .about-stat-num {
    font-size: 46px;
  }

  .about-stat-source {
    margin-top: 8px;
  }

  /* 品牌承诺桌面布局 */
  .about-promise-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .about-promise-lower {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 40px;
    margin-top: 44px;
  }

  .about-cta {
    padding: 44px 36px;
  }
}