.page-about {
  --about-shell: calc(var(--topbar-h) + var(--header-h));
  --about-line-soft: rgba(140, 154, 147, 0.55);
  --about-line-faint: rgba(140, 154, 147, 0.28);
  --about-paper-ink: rgba(244, 239, 226, 0.78);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: calc(var(--about-shell) + 28px) 0 52px;
  overflow: hidden;
  border-bottom: 3px solid var(--charcoal);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(140, 154, 147, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 154, 147, 0.14) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 96px;
  height: 4px;
  background: var(--lime);
}

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

.page-about .about-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 26px;
}

.page-about .about-crumbs .qm-crumbs__item {
  color: rgba(244, 239, 226, 0.7);
  text-decoration: none;
}

.page-about .about-crumbs a.qm-crumbs__item:hover {
  color: var(--lime);
}

.page-about .about-crumbs .qm-crumbs__sep {
  color: var(--about-line-soft);
}

.page-about .about-hero .qm-eyebrow {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(36px, 9vw, 84px);
  line-height: 1.04;
  letter-spacing: 0.01em;
  margin: 16px 0 0;
  max-width: 13em;
}

.page-about .about-hero__lede {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-paper-ink);
  max-width: 44em;
  margin: 22px 0 0;
}

.page-about .about-figures {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 1px;
  background: var(--about-line-faint);
  border: 1px solid var(--about-line-faint);
}

.page-about .about-figure {
  background: var(--ink);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-figure__label {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 226, 0.62);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 7vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-figure__num i {
  font-style: normal;
  font-size: 0.42em;
  margin-left: 4px;
  color: rgba(182, 255, 59, 0.75);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--about-shell);
  z-index: 20;
  background: var(--paper-2);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-toc__inner {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__link {
  flex: 0 0 auto;
  padding: 13px 12px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover {
  color: var(--ink);
  border-bottom-color: var(--about-line-soft);
}

.page-about .about-toc__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-toc__link.is-active {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--lime);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 52px 0 56px;
}

.page-about .about-section--paper {
  background: var(--paper);
}

.page-about .about-section--sand {
  background: var(--paper-3);
  border-top: 1px solid var(--about-line-faint);
  border-bottom: 1px solid var(--about-line-faint);
}

.page-about .about-section--dark {
  background: var(--charcoal);
  color: var(--paper);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-sec-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--green);
  padding: 3px 7px;
  border: 1px solid currentColor;
}

.page-about .about-section--dark .about-sec-num {
  color: var(--lime);
}

.page-about .about-section--dark .about-sec-head {
  border-bottom-color: var(--about-line-soft);
}

.page-about .about-sec-title {
  font-family: var(--font-sans);
  font-size: clamp(21px, 5vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-sec-lede {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
  max-width: 44em;
  margin: 0 0 26px;
}

.page-about .about-section--dark .about-sec-lede {
  color: var(--about-paper-ink);
}

.page-about .about-sec-foot {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
  margin: 22px 0 0;
}

.page-about .about-sec-foot a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-sec-foot a:hover {
  color: var(--ink);
}

/* ---------- 01 三条业务线 ---------- */
.page-about .about-services {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-service {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 10px 22px 0;
  border-bottom: 1px solid var(--about-line-soft);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-service:hover {
  background: var(--paper-3);
  transform: translateX(2px);
}

.page-about .about-service__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  padding-top: 3px;
  border-top: 3px solid var(--lime);
}

.page-about .about-service__title {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px;
}

.page-about .about-service__body p {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.page-about .about-service__who {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--green) !important;
  margin-bottom: 0 !important;
}

/* ---------- 02 / 04 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 30px;
}

.page-about .about-split__media {
  margin: 0;
  order: -1;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}

.page-about .about-split__media figcaption {
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-mute);
  margin-top: 12px;
  max-width: 34em;
}

.page-about .about-split__text .about-sec-lede {
  margin-bottom: 22px;
}

/* ---------- 步骤条 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-step {
  position: relative;
  padding: 0 0 20px 22px;
  border-left: 1px solid var(--about-line-soft);
}

.page-about .about-step:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--green);
  border: 1px solid var(--ink);
}

.page-about .about-step__k {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 6px;
}

.page-about .about-step p {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 03 青训 ---------- */
.page-about .about-band-media {
  margin: 0 0 26px;
}

.page-about .about-band-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--about-line-soft);
}

.page-about .about-band-media figcaption {
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(244, 239, 226, 0.6);
  margin-top: 10px;
}

.page-about .about-ageband {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
}

.page-about .about-ageband a {
  display: inline-block;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
  text-decoration: none;
  background: rgba(182, 255, 59, 0.06);
  border: 2px solid var(--about-line-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-ageband a:hover,
.page-about .about-ageband a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  transform: translateY(-2px);
  outline: none;
}

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

.page-about .about-tier {
  padding: 18px 18px 20px;
  background: rgba(11, 26, 20, 0.55);
  border: 2px solid var(--about-line-faint);
  border-top: 3px solid var(--green);
}

.page-about .about-tier:target {
  border-top-color: var(--lime);
  background: rgba(31, 107, 74, 0.22);
}

.page-about .about-tier__title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
  margin: 0 0 10px;
}

.page-about .about-tier p {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-paper-ink);
  margin: 0;
}

/* ---------- 04 履历字段表 ---------- */
.page-about .about-fields {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 14px;
}

.page-about .about-fields__caption {
  caption-side: top;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding-bottom: 10px;
}

.page-about .about-fields th,
.page-about .about-fields td {
  text-align: left;
  vertical-align: top;
  padding: 11px 12px;
  line-height: 1.7;
  border-bottom: 1px solid var(--about-line-faint);
}

.page-about .about-fields thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-fields tbody th {
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-fields tbody td {
  color: var(--ink-soft);
}

.page-about .about-fields tbody tr:hover {
  background: var(--paper-3);
}

/* ---------- 05 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 26px;
  width: 2px;
  background: var(--about-line-soft);
}

.page-about .about-tl {
  position: relative;
  padding-bottom: 30px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--paper-3);
  border: 3px solid var(--ink);
}

.page-about .about-tl::after {
  content: "";
  position: absolute;
  left: -14px;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--lime);
}

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

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-tl__body h3 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .about-tl__body p {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
  max-width: 40em;
}

/* ---------- 06 团队与合作 ---------- */
.page-about .about-bars {
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "track track";
  gap: 8px 12px;
  align-items: center;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line-faint);
}

.page-about .about-bar__name {
  grid-area: name;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-bar__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-bar__track {
  grid-area: track;
  display: block;
  height: 14px;
  background: var(--paper-2);
  border: 1px solid var(--ink);
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
}

.page-about .about-bar__fill--a { width: 41.8%; background: var(--ink); }
.page-about .about-bar__fill--b { width: 20.9%; background: var(--green); }
.page-about .about-bar__fill--c { width: 28.4%; background: var(--lime); }
.page-about .about-bar__fill--d { width: 9%; background: var(--line); }

.page-about .about-partners {
  border: 2px solid var(--ink);
  padding: 20px 18px 24px;
  background: var(--paper);
  box-shadow: 6px 6px 0 var(--paper-2);
}

.page-about .about-partners__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 18px;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-line-faint);
}

.page-about .about-partners__list .about-partner:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .about-partner__label {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-partner p {
  grid-column: 2;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 4px 0 0;
}

/* ---------- 07 资质 ---------- */
.page-about .about-awards {
  display: grid;
  gap: 16px;
}

.page-about .about-award {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--paper);
  border-left: 6px solid var(--green);
  box-shadow: 4px 4px 0 var(--paper-2);
}

.page-about .about-award__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--paper);
  background: var(--ink);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .about-award__name {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px;
}

.page-about .about-award p {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--paper);
  padding: 56px 0 60px;
  border-top: 3px solid var(--charcoal);
}

.page-about .about-cta__title {
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(26px, 7vw, 52px);
  line-height: 1.12;
  margin: 0 0 16px;
}

.page-about .about-cta__lede {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-paper-ink);
  max-width: 42em;
  margin: 0 0 26px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .about-cta__note {
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.85;
  color: rgba(244, 239, 226, 0.68);
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--about-line-faint);
  max-width: 46em;
}

.page-about .about-cta__note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-section {
    padding: 68px 0 76px;
  }

  .page-about .about-cta {
    padding: 72px 0 80px;
  }

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

  .page-about .about-service {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-service__num {
    font-size: 28px;
  }

  .page-about .about-partners__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partner {
    grid-template-columns: minmax(0, 1fr);
    border-bottom: none;
    border-left: 1px solid var(--about-line-faint);
    padding: 0 0 0 14px;
  }

  .page-about .about-partner p {
    grid-column: 1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--about-shell) + 48px) 0 76px;
  }

  .page-about .about-section {
    padding: 88px 0 96px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-split--reverse .about-split__media {
    order: -1;
  }

  .page-about .about-split__media {
    order: 0;
  }

  .page-about .about-band-media {
    margin-bottom: 34px;
  }

  .page-about .about-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-bar {
    grid-template-columns: 132px minmax(0, 1fr) 72px;
    grid-template-areas: "name track num";
    gap: 16px;
    padding: 14px 0;
  }

  .page-about .about-bar__num {
    text-align: right;
    font-size: 22px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-tl::before {
    left: -34px;
  }

  .page-about .about-tl::after {
    left: -22px;
  }

  .page-about .about-tl {
    display: grid;
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 38px;
  }

  .page-about .about-tl__year {
    font-size: 24px;
    text-align: right;
    margin-bottom: 0;
    padding-top: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-service,
  .page-about .about-ageband a,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-service:hover,
  .page-about .about-ageband a:hover,
  .page-about .about-ageband a:focus-visible {
    transform: none;
  }
}