/* ================= 品牌年鉴页面 ================= */
.page-about {
  --ab-gap: clamp(1.5rem, 4vw, 3rem);
  --ab-pad-y: clamp(2.25rem, 6vw, 4rem);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .ab-crumb {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2.25rem, 6vw, 4rem);
  background:
    linear-gradient(175deg, var(--paper) 0%, var(--paper) 58%, var(--paper-card) 100%);
  border-bottom: 1px solid var(--line-strong);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -110px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, rgba(199, 154, 46, 0.18), rgba(199, 154, 46, 0) 70%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-hero__lead h1 {
  margin: 0.65rem 0 0;
  font-size: clamp(1.85rem, 5.6vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 20ch;
  color: var(--ink);
}

.page-about .ab-hero__text {
  margin: 1rem 0 0;
  font-size: clamp(0.98rem, 2.2vw, 1.08rem);
  line-height: 1.78;
  color: var(--ink);
  max-width: 46ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 4vw, 2rem) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .ab-figures > div {
  background: var(--paper-card);
  padding: 0.85rem 0.9rem;
}

.page-about .ab-figures dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fog);
  font-weight: 500;
  line-height: 1.4;
}

.page-about .ab-figures dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.8rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--copper-deep);
}

.page-about .ab-figures dd span {
  margin-left: 0.22rem;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .ab-hero__plate {
  position: relative;
  margin: 0;
  padding: 0.8rem 0.8rem 0.7rem;
  background: var(--paper-card);
  border: 1px solid var(--line-strong);
  box-shadow:
    10px 10px 0 -1px var(--paper),
    10px 10px 0 0 var(--line-gold);
}

.page-about .ab-hero__plate img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .ab-hero__plate .img-caption {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .ab-plate-num {
  position: absolute;
  right: 0.9rem;
  bottom: 1.7rem;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 11vw, 6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold);
  opacity: 0.85;
  pointer-events: none;
}

/* ---------- 主体 ---------- */
.page-about .ab-body {
  padding: var(--ab-pad-y) 0;
  background: var(--paper);
}

.page-about .ab-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-index__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .ab-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
}

.page-about .ab-index a {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  white-space: nowrap;
  font-size: 0.88rem;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  background: var(--paper-card);
  border: 1px solid var(--line);
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--copper-deep);
  border-color: var(--copper);
  background: var(--copper-soft);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .ab-sr-title {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .ab-chapters {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  min-width: 0;
}

.page-about .ab-chapter {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.05rem;
  scroll-margin-top: 1.25rem;
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.page-about .ab-chapter__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .ab-chapter h3 {
  margin: 0;
  font-size: clamp(1.22rem, 3.1vw, 1.7rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-chapter > p {
  margin: 0.85rem 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 62ch;
}

.page-about .ab-note {
  margin: 1rem 0 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .ab-note a {
  color: var(--indigo);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  position: relative;
  margin: 1.4rem 0 0;
  padding: 0 0 0 1.5rem;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--copper), var(--gold));
}

.page-about .ab-timeline > li {
  position: relative;
  margin: 0 0 0.7rem;
}

.page-about .ab-timeline > li:last-child {
  margin-bottom: 0;
}

.page-about .ab-timeline > li::before {
  content: "";
  position: absolute;
  left: -1.34rem;
  top: 1.02rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper-card);
  border: 2px solid var(--copper);
}

.page-about .ab-stage {
  background: var(--paper-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .ab-stage[open] {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.page-about .ab-stage summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  padding: 0.8rem 0.95rem;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-stage summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-stage summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .ab-stage[open] summary::after {
  content: "–";
  color: var(--copper-deep);
}

.page-about .ab-stage__phase {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .ab-stage__title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-stage__body {
  padding: 0 0.95rem 0.95rem;
  border-top: 1px dashed var(--line);
  margin-top: 0.15rem;
}

.page-about .ab-stage__body p {
  margin: 0.75rem 0 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 周更节奏 ---------- */
.page-about .ab-cadence {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-cadence li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem;
  padding: 0.85rem 0.95rem;
  background: var(--paper-card);
}

.page-about .ab-cadence__when {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--copper-deep);
}

.page-about .ab-cadence__what {
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.4rem;
  margin-top: 0.9rem;
  align-items: start;
}

.page-about .ab-team__text p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-flow {
  list-style: none;
  counter-reset: none;
  margin: 1.1rem 0 0;
  padding: 0;
}

.page-about .ab-flow li {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.5rem 0;
  font-size: 0.93rem;
  line-height: 1.65;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow li:last-child {
  border-bottom: 0;
}

.page-about .ab-flow__no {
  flex: none;
  width: 1.5rem;
  height: 1.5rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--paper-card);
  background: var(--copper);
}

.page-about .ab-team__figure {
  margin: 0;
  padding: 0.65rem;
  background: var(--paper-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .ab-team__figure .img-caption {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--fog);
}

/* ---------- 服务覆盖 ---------- */
.page-about .ab-coverage {
  margin-top: 1rem;
  padding: clamp(1.1rem, 3.5vw, 1.9rem);
  background: var(--copper-soft);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--copper);
}

.page-about .ab-coverage__lead {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--copper-deep);
  max-width: 58ch;
}

.page-about .ab-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.1rem 0 0;
  padding: 0;
}

.page-about .ab-cities li {
  padding: 0.32rem 0.7rem;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--copper-deep);
  background: var(--paper-card);
  border: 1px solid var(--line-strong);
}

.page-about .ab-coverage__figure {
  margin: 1.2rem 0 0;
}

.page-about .ab-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  filter: saturate(0.55) contrast(1.03);
}

.page-about .ab-coverage__figure .img-caption {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--copper-deep);
  opacity: 0.85;
}

/* ---------- 原则 ---------- */
.page-about .ab-principles {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-principles li {
  padding: 0.9rem 1rem;
  background: var(--paper-card);
  border-left: 3px solid var(--gold);
}

.page-about .ab-principles h4 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--copper-deep);
}

.page-about .ab-principles p {
  margin: 0.4rem 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 尾部行动区 ---------- */
.page-about .ab-cta {
  padding: clamp(1.9rem, 5vw, 3.1rem) 0;
  background: var(--paper-card);
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.4rem;
  align-items: center;
}

.page-about .ab-cta h2 {
  margin: 0.55rem 0 0;
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--ink);
  max-width: 24ch;
}

.page-about .ab-cta__text {
  margin: 0.7rem 0 0;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--fog);
  max-width: 56ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-cadence li {
    grid-template-columns: minmax(96px, 120px) minmax(0, 1fr);
    gap: 0.9rem;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: 1.8rem;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    gap: 2rem;
  }

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .ab-body__grid {
    grid-template-columns: minmax(190px, 232px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .ab-index {
    position: sticky;
    top: 1.1rem;
  }

  .page-about .ab-index ol {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--line);
    gap: 0;
  }

  .page-about .ab-index li + li {
    margin-top: 1px;
  }

  .page-about .ab-index a {
    white-space: normal;
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding: 0.5rem 0.7rem;
    font-size: 0.9rem;
  }

  .page-about .ab-index a:hover,
  .page-about .ab-index a:focus-visible {
    border-left-color: var(--copper);
    background: var(--copper-soft);
  }
}
<<<END>>>