.page-about {
  --about-gold: var(--gold);
  --about-red: var(--red);
  --about-blue: var(--blue);
  --about-bg: var(--bg-obsidian);
  --about-graphite: var(--bg-graphite);
  --about-raised: var(--bg-raised);
  --about-line: var(--line);
  --about-muted: var(--muted);
  --about-text: var(--text);
  --about-headline: var(--headline-font);
  --about-body: var(--body-font);
  position: relative;
  max-width: 1360px;
  margin: 0 auto;
  background: var(--about-bg);
  color: var(--about-text);
  font-family: var(--about-body);
}

.page-about .breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 24px 0;
}

.page-about .section-kicker {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  color: var(--about-gold);
  font-family: var(--about-headline);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about .milestone-year,
.page-about .stat-num,
.page-about .panel-glyph,
.page-about .role-code {
  font-family: var(--about-headline);
}

/* ===== 品牌起源 Hero ===== */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px 48px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -80px;
  right: -60px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, var(--about-line), transparent);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  max-width: 760px;
  margin: 14px 0 20px;
  font-size: 32px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--about-text);
}

.page-about .hero-copy p {
  max-width: 680px;
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  opacity: 0.88;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-trust {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 24px;
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .trust-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--about-gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.16);
}

.page-about .hero-media {
  position: relative;
  z-index: 1;
  margin: 0;
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 4%, 96% 96%, 4% 100%);
  border: 1px solid var(--about-line);
}

/* ===== 数据速览 ===== */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .stat-cell {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  padding: 20px 16px;
  background: var(--about-graphite);
}

.page-about .stat-num {
  font-size: 28px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--about-gold);
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--about-muted);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 24px;
}

.page-about .milestones-sidebar {
  min-width: 0;
}

.page-about .brand-panel {
  position: relative;
  padding: 28px 24px;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(212, 175, 55, 0.06), transparent 40%), var(--about-raised);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
}

.page-about .brand-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--about-gold), transparent);
}

.page-about .panel-glyph {
  display: block;
  font-size: 56px;
  line-height: 1;
  color: var(--about-gold);
}

.page-about .panel-name {
  margin-top: 12px;
  font-family: var(--about-headline);
  font-size: 22px;
  line-height: 1.2;
  color: var(--about-text);
}

.page-about .panel-sub {
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-muted);
  text-transform: uppercase;
}

.page-about .panel-desc {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text);
  opacity: 0.85;
}

.page-about .panel-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-about .panel-meta span {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--about-line);
  font-size: 12px;
  color: var(--about-muted);
}

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

.page-about .about-milestones .section-head {
  margin-bottom: 28px;
}

.page-about .about-milestones h2,
.page-about .about-quality h2,
.page-about .about-team h2,
.page-about .about-authority h2 {
  margin: 8px 0 0;
  font-size: 26px;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--about-text);
}

/* 时间轴 */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 24px;
  padding: 8px 0 8px 32px;
  border-left: 1px solid var(--about-line);
}

.page-about .milestone-card {
  position: relative;
  background: var(--about-raised);
  border: 1px solid var(--about-line);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
}

.page-about .milestone-card::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 30px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--about-gold);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.18);
  z-index: 1;
}

.page-about .milestone-card:last-child {
  border-color: rgba(212, 175, 55, 0.5);
}

.page-about .milestone-toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  margin: 0;
  padding: 22px 18px;
  list-style: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s ease;
}

.page-about .milestone-toggle::-webkit-details-marker {
  display: none;
}

.page-about .milestone-toggle::marker {
  content: "";
}

.page-about .milestone-toggle:hover {
  background: rgba(212, 175, 55, 0.06);
}

.page-about .milestone-card[open] > .milestone-toggle {
  border-bottom: 1px solid var(--about-line);
}

.page-about .milestone-year {
  min-width: 60px;
  font-size: 38px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--about-gold);
}

.page-about .milestone-title {
  font-family: var(--about-headline);
  font-size: 15px;
  line-height: 1.4;
  color: var(--about-text);
}

.page-about .toggle-mark {
  flex: 0 0 auto;
  min-width: 46px;
  margin-left: auto;
  padding: 4px 8px;
  border: 1px solid var(--about-line);
  text-align: center;
  font-size: 12px;
  line-height: 1.4;
  color: var(--about-muted);
}

.page-about details[open] .toggle-mark::before {
  content: "收起";
}

.page-about details:not([open]) .toggle-mark::before {
  content: "展开";
}

.page-about .milestone-body {
  padding: 22px 18px 24px;
}

.page-about .milestone-body h3 {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--about-gold);
}

.page-about .milestone-body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
  opacity: 0.88;
}

.page-about .milestone-card:nth-child(2) .milestone-toggle {
  padding-left: 26px;
}

.page-about .milestone-card:nth-child(3) .milestone-toggle {
  padding-left: 32px;
}

/* ===== 数据与质量 ===== */
.page-about .about-quality {
  position: relative;
  padding: 48px 24px;
  background:
    linear-gradient(115deg, transparent 0%, transparent 64%, rgba(0, 200, 255, 0.05) 64%, rgba(0, 200, 255, 0.05) 66%, transparent 66%),
    var(--about-graphite);
}

.page-about .about-quality .section-head,
.page-about .about-authority .section-head {
  margin-bottom: 16px;
}

.page-about .about-quality .section-kicker,
.page-about .about-authority .section-kicker {
  border-bottom-color: rgba(0, 200, 255, 0.4);
}

.page-about .quality-intro p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  opacity: 0.88;
}

.page-about .quality-flow {
  margin-top: 24px;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 0 20px 54px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .flow-step:last-child {
  border-bottom: 0;
  padding-bottom: 8px;
}

.page-about .step-num {
  position: absolute;
  left: 0;
  top: 18px;
  font-size: 26px;
  line-height: 1;
  color: var(--about-gold);
}

.page-about .flow-step h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 400;
  color: var(--about-text);
}

.page-about .flow-step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
  opacity: 0.85;
}

.page-about .quality-media {
  margin: 28px 0 0;
}

.page-about .quality-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
  border: 1px solid var(--about-line);
  background: var(--about-bg);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

/* ===== 团队与资质 ===== */
.page-about .about-team {
  padding: 48px 24px;
  background: var(--about-bg);
}

.page-about .about-team .section-head {
  margin-bottom: 16px;
}

.page-about .team-copy {
  max-width: 640px;
}

.page-about .team-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  opacity: 0.88;
}

.page-about .team-roles {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-roles li {
  display: flex;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--about-line);
  background: var(--about-raised);
}

.page-about .role-code {
  flex: 0 0 auto;
  height: -webkit-fit-content;
  height: fit-content;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--about-gold);
  font-size: 20px;
  line-height: 1;
  color: var(--about-gold);
}

.page-about .team-roles h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 400;
  color: var(--about-text);
}

.page-about .team-roles p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
  opacity: 0.85;
}

.page-about .team-cert {
  margin-top: 28px;
  padding: 26px 22px;
  border-left: 4px solid var(--about-blue);
  background:
    linear-gradient(145deg, rgba(0, 200, 255, 0.06), transparent 55%),
    var(--about-graphite);
}

.page-about .cert-label {
  display: block;
  font-family: var(--about-headline);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--about-blue);
}

.page-about .team-cert p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text);
  opacity: 0.85;
}

/* ===== 官方授权 ===== */
.page-about .about-authority {
  position: relative;
  padding: 48px 24px 72px;
  background:
    linear-gradient(120deg, rgba(139, 30, 46, 0.18), transparent 60%),
    var(--about-graphite);
}

.page-about .about-authority .section-kicker {
  border-bottom-color: rgba(139, 30, 46, 0.5);
}

.page-about .authority-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  opacity: 0.88;
}

.page-about .authority-info {
  display: grid;
  gap: 16px;
  margin: 24px 0;
}

.page-about .license-card,
.page-about .address-card {
  padding: 20px;
  border: 1px solid var(--about-line);
  background: var(--about-bg);
}

.page-about .license-label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  text-transform: uppercase;
  color: var(--about-muted);
}

.page-about .license-value,
.page-about .address-value {
  font-family: var(--about-headline);
  font-size: 15px;
  line-height: 1.5;
  color: var(--about-gold);
  word-break: break-all;
}

.page-about .authority-contact {
  margin-top: 20px !important;
  padding: 16px 18px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  background: rgba(212, 175, 55, 0.05);
  color: var(--about-text) !important;
  opacity: 1 !important;
}

.page-about .authority-note {
  margin-top: 16px !important;
  font-size: 13px !important;
  color: var(--about-muted) !important;
  opacity: 1 !important;
}

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

.page-about .authority-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid var(--about-line);
  font-family: var(--about-headline);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--about-blue);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .authority-links a:hover {
  border-color: var(--about-blue);
  color: var(--about-text);
}

.page-about .authority-media {
  margin: 32px 0 0;
}

.page-about .authority-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--about-line);
  background: var(--about-bg);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .stat-cell {
    padding: 24px 20px;
  }

  .page-about .stat-num {
    font-size: 32px;
  }

  .page-about .timeline {
    padding-left: 48px;
  }

  .page-about .milestone-card::before {
    left: -54px;
    top: 32px;
    width: 16px;
    height: 16px;
  }

  .page-about .milestone-year {
    min-width: 76px;
    font-size: 44px;
  }

  .page-about .milestone-toggle {
    padding: 24px 22px;
  }

  .page-about .milestone-body {
    padding: 24px 22px;
  }

  .page-about .authority-info {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 992px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 480px;
    gap: 64px;
    align-items: center;
    padding: 80px 40px 96px;
  }

  .page-about .about-hero h1 {
    font-size: 44px;
  }

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

  .page-about .about-stats {
    border-bottom-width: 1px;
  }

  .page-about .about-milestones {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 72px;
    padding: 80px 40px;
  }

  .page-about .brand-panel {
    position: sticky;
    top: 120px;
    padding: 32px 26px;
  }

  .page-about .panel-glyph {
    font-size: 64px;
  }

  .page-about .about-milestones h2,
  .page-about .about-quality h2,
  .page-about .about-team h2,
  .page-about .about-authority h2 {
    font-size: 34px;
  }

  .page-about .timeline {
    gap: 32px;
  }

  .page-about .milestone-card:nth-child(3) .milestone-toggle {
    padding-left: 44px;
  }

  .page-about .about-quality {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding: 80px 40px;
  }

  .page-about .quality-intro {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .quality-flow {
    grid-column: 1;
    grid-row: 2;
    margin-top: 12px;
  }

  .page-about .quality-media {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    margin-top: 0;
  }

  .page-about .about-team {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding: 80px 40px;
  }

  .page-about .team-copy {
    max-width: none;
  }

  .page-about .team-roles {
    margin-top: 0;
  }

  .page-about .team-cert {
    margin-top: 0;
  }

  .page-about .about-authority {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 64px;
    align-items: center;
    padding: 80px 40px;
  }

  .page-about .authority-copy {
    max-width: 760px;
  }

  .page-about .authority-media {
    margin-top: 0;
  }
}