.page-about {
  --about-rule: 2px solid var(--deep-900);
  --about-hair: 1px solid rgba(10, 34, 57, 0.16);
  --about-sans: var(--font-body);
  background: var(--sand-100);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about figure {
  margin: 0;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(22px, 3.4vw, 40px) clamp(34px, 5vw, 66px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 46px);
  align-items: end;
  margin-top: clamp(14px, 2.4vw, 28px);
}

.page-about .about-title {
  margin: 14px 0 18px;
  line-height: 1.04;
  letter-spacing: -0.015em;
}

.page-about .about-deck {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--ink-900);
  font-family: var(--about-sans);
}

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

.page-about .about-marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  border: 1.5px solid var(--deep-900);
  background: var(--paper-050);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--deep-900);
  line-height: 1.3;
}

.page-about .about-marks .num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--deep-700);
}

.page-about .about-figure {
  aspect-ratio: 2 / 1;
  overflow: hidden;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--deep-900);
}

/* ---------- 阶段索引条 ---------- */

.page-about .about-index {
  background: var(--paper-050);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-index-inner {
  display: flex;
  align-items: center;
  gap: 4px;
  padding-block: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--deep-700);
  padding-right: 10px;
  margin-right: 6px;
  border-right: 2px solid var(--gold-500);
}

.page-about .about-index a {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--deep-900);
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index a .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold-500);
}

.page-about .about-index a:hover {
  background: var(--gold-200);
  border-color: var(--deep-900);
}

.page-about .about-index a:focus-visible {
  outline: 2px solid var(--coral-500);
  outline-offset: 2px;
  border-color: var(--deep-900);
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .about-head .display-lg {
  margin: 12px 0 14px;
  line-height: 1.1;
}

.page-about .about-head--split {
  max-width: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px 40px;
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: var(--deep-700);
}

.page-about .about-lead + .about-lead {
  margin-top: 14px;
}

.page-about .section--deep .about-lead {
  color: rgba(251, 247, 239, 0.82);
}

/* ---------- 品牌起点 ---------- */

.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .origin-side {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .origin-glyph {
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 900;
  line-height: 1;
  color: var(--gold-500);
  letter-spacing: -0.03em;
}

.page-about .origin-copy h2 {
  margin: 0 0 16px;
  line-height: 1.14;
}

.page-about .origin-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--about-hair);
}

.page-about .origin-points li {
  position: relative;
  padding: 13px 0 13px 26px;
  border-bottom: var(--about-hair);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-900);
}

.page-about .origin-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 14px;
  height: 2px;
  background: var(--coral-500);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 16px 0 26px 30px;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 13px;
  height: 13px;
  background: var(--gold-500);
  border: 2px solid var(--deep-900);
  border-radius: 50%;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 40px;
  bottom: -2px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(10, 34, 57, 0.5) 0 6px,
    transparent 6px 13px
  );
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-year {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.page-about .tl-year-num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 6vw, 46px);
  font-weight: 700;
  line-height: 0.88;
  color: var(--deep-900);
  letter-spacing: -0.03em;
}

.page-about .tl-tag {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--deep-700);
  padding-top: 3px;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--deep-900);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .tl-item:hover::after {
  background: var(--coral-500);
}

/* ---------- 认证标准 ---------- */

.page-about .std-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .std-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .std-item {
  border: var(--about-rule);
  background: var(--paper-050);
  box-shadow: var(--shadow-hard);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .std-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .std-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15.5px, 1.7vw, 17.5px);
  font-weight: 800;
  color: var(--deep-900);
  letter-spacing: -0.005em;
}

.page-about .std-item summary::-webkit-details-marker {
  display: none;
}

.page-about .std-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--coral-500);
}

.page-about .std-item[open] summary::after {
  content: "−";
}

.page-about .std-item summary:focus-visible {
  outline: 2px solid var(--coral-500);
  outline-offset: -4px;
  box-shadow: inset 0 0 0 4px var(--gold-500);
}

.page-about .std-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--paper-050);
  background: var(--deep-900);
  padding: 3px 7px;
  letter-spacing: 0.06em;
}

.page-about .std-body {
  padding: 0 16px 16px;
  border-top: var(--about-hair);
  padding-top: 14px;
}

.page-about .std-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .std-figure {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--deep-700);
}

/* ---------- 记录体系 ---------- */

.page-about .lane-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .lane {
  border: 2px solid rgba(232, 215, 168, 0.34);
  background: rgba(251, 247, 239, 0.05);
  padding: 20px 18px;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.page-about .lane:hover {
  transform: translateY(-2px);
  border-color: var(--gold-500);
  background: rgba(201, 162, 74, 0.14);
}

.page-about .lane-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--gold-500);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.page-about .lane h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--paper-050);
  line-height: 1.4;
}

.page-about .lane p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(251, 247, 239, 0.78);
}

.page-about .member-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(232, 215, 168, 0.28);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gold-200);
}

/* ---------- 覆盖网络 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 46px);
  align-items: center;
}

.page-about .coverage-copy h2 {
  margin: 12px 0 16px;
  line-height: 1.12;
}

.page-about .net-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--deep-900);
  border: var(--about-rule);
}

.page-about .net-stats li {
  background: var(--paper-050);
  padding: 16px 14px;
}

.page-about .net-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--deep-900);
  letter-spacing: -0.02em;
}

.page-about .stat-label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep-700);
}

.page-about .coverage-figure {
  aspect-ratio: 10 / 7;
  overflow: hidden;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--deep-900);
}

/* ---------- 培训复训 ---------- */

.page-about .train-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: clamp(20px, 3vw, 34px);
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--paper-050);
}

.page-about .train-figure {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  background: var(--deep-900);
  padding: 20px 18px;
}

.page-about .train-figure .num {
  font-family: var(--font-mono);
  font-size: clamp(44px, 7vw, 66px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--gold-500);
  letter-spacing: -0.03em;
}

.page-about .train-unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold-200);
}

.page-about .train-copy h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--deep-900);
}

.page-about .train-copy > p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-900);
  max-width: 66ch;
}

.page-about .train-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-hair);
}

.page-about .train-list li {
  padding: 12px 0;
  border-bottom: var(--about-hair);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-900);
}

.page-about .train-list strong {
  color: var(--deep-900);
  font-weight: 800;
  margin-right: 6px;
}

/* ---------- 品质承诺 ---------- */

.page-about .promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .promise {
  border-top: 5px solid var(--gold-500);
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
  border-left: var(--about-rule);
  background: var(--paper-050);
  padding: 20px 18px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .promise:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
}

.page-about .promise h3 {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.42;
  color: var(--deep-900);
}

.page-about .promise p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: 24px;
  border-top: var(--about-rule);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-cta p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--deep-700);
}

.page-about .about-followup {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--deep-700);
}

.page-about .about-followup a {
  color: var(--deep-900);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--gold-500);
  padding-bottom: 1px;
}

.page-about .about-followup a:hover {
  background: var(--gold-200);
}

.page-about .about-followup a:focus-visible {
  outline: 2px solid var(--coral-500);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .lane-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-index {
    position: sticky;
    top: var(--header-h);
    z-index: 6;
  }

  .page-about .origin-grid {
    grid-template-columns: 180px 1fr;
    align-items: start;
  }

  .page-about .origin-side {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 90px);
  }

  .page-about .origin-glyph {
    writing-mode: vertical-rl;
    font-size: 44px;
    letter-spacing: 0.02em;
  }

  .page-about .about-head--split {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .tl-item {
    grid-template-columns: 168px 1fr;
    gap: 0 40px;
    padding: 20px 0 32px 46px;
  }

  .page-about .tl-item::after {
    left: 16px;
    top: 26px;
    width: 15px;
    height: 15px;
  }

  .page-about .tl-item::before {
    left: 23px;
    top: 48px;
  }

  .page-about .tl-year {
    align-items: flex-start;
    gap: 14px;
  }

  .page-about .tl-year-num {
    font-size: 58px;
  }

  .page-about .train-band {
    grid-template-columns: 200px 1fr;
    align-items: center;
    gap: 30px;
  }

  .page-about .coverage-grid {
    grid-template-columns: 1.1fr 1fr;
  }
}

@media (min-width: 980px) {
  .page-about .std-layout {
    grid-template-columns: 1.4fr 1fr;
  }
}

@media (min-width: 1040px) {
  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .lane-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .net-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<PAGE_CSS_DONE>>>
<<<END>>>