.page-about {
  --about-pad: clamp(3rem, 8vw, 5.5rem);
  --about-gap: 1.5rem;
  background: var(--sb-cream);
  color: var(--sb-ink);
  font-family: var(--sb-font-body);
  overflow-x: hidden;
}

.page-about .sb-section {
  padding-block: var(--about-pad);
}

.page-about .about-crumb-wrap {
  padding-top: 1.5rem;
  padding-bottom: 0.25rem;
}

/* ---------- 开篇铭牌 ---------- */
.page-about .about-plate {
  padding-top: 1rem;
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  background: var(--sb-cream);
}

.page-about .about-plate__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-plate__rail {
  display: none;
}

.page-about .about-plate__vnote {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.3em;
  font-family: var(--sb-font-mono);
  font-size: 0.75rem;
  color: var(--sb-slate);
  border-left: 1px solid var(--sb-cyan);
  padding-left: 0.6rem;
  line-height: 1;
}

.page-about .about-plate__body {
  position: relative;
  padding-top: 1.25rem;
}

.page-about .about-plate__body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 3px;
  background: var(--sb-orange);
}

.page-about .about-plate__body h1 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.18;
  font-size: clamp(1.9rem, 6.4vw, 3.4rem);
  color: var(--sb-ink);
  margin: 0.5rem 0 1rem;
  max-width: 22em;
}

.page-about .about-plate__body .sb-lead {
  color: #4a4038;
  max-width: 34em;
}

.page-about .about-plate__stats {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  background: var(--sb-line-ink);
  border-top: 1px solid var(--sb-line-ink);
  border-bottom: 1px solid var(--sb-line-ink);
}

.page-about .about-plate__stat {
  background: var(--sb-cream);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-plate__stat .sb-stat__num {
  font-family: var(--sb-font-mono);
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  font-weight: 700;
  color: var(--sb-orange);
  letter-spacing: 0.02em;
  line-height: 1;
}

.page-about .about-plate__stat .sb-stat__label {
  font-size: 0.82rem;
  color: var(--sb-slate);
  letter-spacing: 0.04em;
}

.page-about .about-plate__media {
  margin: 0;
  clip-path: var(--sb-cut);
  background: var(--sb-slate);
}

.page-about .sb-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}


/* ---------- 发展年表 ---------- */
.page-about .about-timeline {
  background: var(--sb-deep);
  background-image: var(--sb-hatch);
  color: var(--sb-paper);
}

.page-about .about-timeline__head .sb-lead {
  color: rgba(251, 246, 236, 0.72);
}

.page-about .about-timeline__head h2 {
  color: var(--sb-paper);
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-node {
  position: relative;
  padding: 1.25rem 1.15rem 1.15rem;
  background: rgba(251, 246, 236, 0.05);
  border: 1px solid var(--sb-line-dark);
  clip-path: var(--sb-cut);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.page-about .about-node:hover,
.page-about .about-node:focus-visible {
  background: rgba(251, 246, 236, 0.09);
  border-color: var(--sb-orange);
  outline: none;
}

.page-about .about-node__dot {
  display: none;
}

.page-about .about-node__era {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--sb-cyan);
  margin: 0 0 0.5rem;
}

.page-about .about-node__title {
  font-family: var(--sb-font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(1.05rem, 3.4vw, 1.25rem);
  color: var(--sb-paper);
  margin: 0 0 0.5rem;
  line-height: 1.35;
}

.page-about .about-node__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(251, 246, 236, 0.78);
}

.page-about .about-node__detail {
  display: grid;
  grid-template-rows: 1fr;
  margin-top: 0.75rem;
  border-top: 1px dashed rgba(47, 214, 198, 0.32);
  padding-top: 0.75rem;
}

.page-about .about-node__detail > p {
  overflow: hidden;
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(47, 214, 198, 0.9);
}

/* ---------- 团队与质检 ---------- */
.page-about .about-team {
  background: var(--sb-cream);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.page-about .about-team__text h2 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  color: var(--sb-ink);
  margin: 0.5rem 0 1rem;
}

.page-about .about-team__text .sb-lead {
  color: #4a4038;
  max-width: 36em;
}

.page-about .about-team__facts {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-team__facts li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: #4a4038;
  border-bottom: 1px solid var(--sb-line-ink);
  padding-bottom: 0.6rem;
}

.page-about .about-team__facts .sb-mono {
  font-family: var(--sb-font-mono);
  color: var(--sb-deep);
  font-weight: 700;
  letter-spacing: 0.04em;
  min-width: 5.5rem;
  font-size: 0.95rem;
}

.page-about .about-team__ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  text-align: center;
}

.page-about .about-ring {
  position: relative;
  width: min(200px, 62vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: conic-gradient(var(--sb-orange) 0 62.2%, rgba(147, 162, 178, 0.35) 62.2% 100%);
  display: grid;
  place-items: center;
}

.page-about .about-ring::before {
  content: "";
  position: absolute;
  inset: 17%;
  border-radius: 50%;
  background: var(--sb-cream);
}

.page-about .about-ring__value {
  position: relative;
  z-index: 1;
  font-family: var(--sb-font-mono);
  font-size: clamp(1.6rem, 6vw, 2rem);
  font-weight: 700;
  color: var(--sb-deep);
  letter-spacing: 0.02em;
}

.page-about .about-ring__label {
  margin: 0;
  max-width: 24em;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--sb-slate);
}

.page-about .about-team__media {
  margin: 2.25rem 0 0;
  clip-path: var(--sb-cut);
  background: var(--sb-slate);
}

.page-about .about-qc {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-qc__item {
  position: relative;
  padding: 1.35rem 1.15rem;
  background: var(--sb-paper);
  border-left: 3px solid var(--sb-cyan);
  clip-path: var(--sb-cut);
}

.page-about .about-qc__item:first-child {
  border-left-color: var(--sb-orange);
}

.page-about .about-qc__num {
  display: block;
  font-family: var(--sb-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--sb-orange);
  margin-bottom: 0.4rem;
}

.page-about .about-qc__item h3 {
  font-family: var(--sb-font-display);
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 0.45rem;
  color: var(--sb-ink);
}

.page-about .about-qc__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: #4a4038;
}

/* ---------- 长期合作 ---------- */
.page-about .about-loyal {
  background: var(--sb-paper);
  background-image: var(--sb-hatch);
}

.page-about .about-loyal .sb-section__head h2 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  color: var(--sb-ink);
  margin: 0.5rem 0 1rem;
}

.page-about .about-loyal .sb-section__head .sb-lead {
  color: #4a4038;
  max-width: 40em;
}

.page-about .about-loyal .sb-tabs {
  margin-top: 2rem;
}

.page-about .about-loyal__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 1.75rem;
}

.page-about .about-loyal__figure {
  background: var(--sb-deep);
  clip-path: var(--sb-cut);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  border-left: 4px solid var(--sb-orange);
}

.page-about .about-loyal__figure--plain {
  background: var(--sb-deep-2);
  border-left-color: var(--sb-cyan);
}

.page-about .about-loyal__big {
  font-family: var(--sb-font-mono);
  font-size: clamp(2.4rem, 10vw, 3.4rem);
  font-weight: 700;
  color: var(--sb-amber);
  line-height: 1;
  letter-spacing: 0.01em;
}

.page-about .about-loyal__figure--plain .about-loyal__big {
  color: var(--sb-cyan);
}

.page-about .about-loyal__cap {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: rgba(251, 246, 236, 0.72);
}

.page-about .about-loyal__text p {
  margin: 0 0 1rem;
  line-height: 1.78;
  color: #4a4038;
  font-size: 0.95rem;
}

.page-about .about-loyal__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-loyal__cases {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-loyal__case {
  background: var(--sb-cream);
  padding: 1.25rem 1.15rem;
  border-top: 3px solid var(--sb-orange);
  clip-path: var(--sb-cut);
}

.page-about .about-loyal__case h3 {
  font-family: var(--sb-font-display);
  font-weight: 800;
  font-size: 1.02rem;
  margin: 0 0 0.45rem;
  color: var(--sb-ink);
}

.page-about .about-loyal__case p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: #4a4038;
}

/* ---------- 资质与合作生态 ---------- */
.page-about .about-qual {
  background: var(--sb-deep-2);
  color: var(--sb-paper);
}

.page-about .about-qual__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.page-about .about-qual__text h2 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.55rem, 5vw, 2.35rem);
  color: var(--sb-paper);
  margin: 0.5rem 0 1rem;
}

.page-about .about-qual__text .sb-lead {
  color: rgba(251, 246, 236, 0.75);
  max-width: 36em;
}

.page-about .about-qual__cards {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(47, 214, 198, 0.18);
}

.page-about .about-qual__card {
  background: var(--sb-deep);
  padding: 1.15rem 1.1rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.9rem;
}

.page-about .about-qual__num {
  font-family: var(--sb-font-mono);
  font-size: clamp(1.4rem, 5vw, 1.8rem);
  font-weight: 700;
  color: var(--sb-cyan);
  line-height: 1;
}

.page-about .about-qual__card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(251, 246, 236, 0.8);
}

.page-about .about-qual__note {
  margin: 1.5rem 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--sb-amber);
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(251, 246, 236, 0.78);
}

.page-about .about-qual__linkline {
  margin: 1.1rem 0 0;
  font-size: 0.88rem;
  color: rgba(251, 246, 236, 0.72);
}

.page-about .about-qual__linkline a {
  color: var(--sb-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-qual__media {
  margin: 0;
  clip-path: var(--sb-cut);
  background: var(--sb-deep);
}

/* ---------- 服务网络与到访 ---------- */
.page-about .about-network {
  background: var(--sb-cream);
}

.page-about .about-network .sb-section__head h2 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  color: var(--sb-ink);
  margin: 0.5rem 0 1rem;
}

.page-about .about-network .sb-section__head .sb-lead {
  color: #4a4038;
  max-width: 42em;
}

.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .about-network__col {
  background: var(--sb-paper);
  padding: 1.4rem 1.2rem;
  border-top: 3px solid var(--sb-cyan);
  clip-path: var(--sb-cut);
}

.page-about .about-network__col--visit {
  border-top-color: var(--sb-orange);
}

.page-about .about-network__col h3 {
  font-family: var(--sb-font-display);
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 0.9rem;
  color: var(--sb-ink);
}

.page-about .about-network__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-network__list li {
  font-size: 0.88rem;
  line-height: 1.72;
  color: #4a4038;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--sb-line-ink);
}

.page-about .about-network__list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-network__list .sb-mono {
  display: inline-block;
  font-family: var(--sb-font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--sb-deep);
  background: rgba(47, 214, 198, 0.16);
  padding: 0.1rem 0.45rem;
  margin-right: 0.35rem;
  font-size: 0.84rem;
}

.page-about .about-cta {
  margin-top: 2.25rem;
  background: var(--sb-deep);
  background-image: var(--sb-hatch);
  clip-path: var(--sb-cut);
  padding: 1.75rem 1.35rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  align-items: center;
}

.page-about .about-cta__text h3 {
  font-family: var(--sb-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.2rem, 4.4vw, 1.6rem);
  color: var(--sb-paper);
  margin: 0 0 0.5rem;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(251, 246, 236, 0.74);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 48rem) {
  .page-about .about-loyal__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 2rem;
    align-items: start;
  }

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

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

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

  .page-about .about-network__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 2rem 1.75rem;
  }
}

@media (min-width: 64rem) {
  .page-about .about-plate__inner {
    grid-template-columns: 3.5rem minmax(0, 7fr) minmax(0, 4fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-plate__rail {
    display: block;
    position: sticky;
    top: 7rem;
    padding-top: 1.25rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-qual__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
    align-items: start;
  }

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

  /* 横向时间轴 */
  .page-about .about-timeline__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 4.25rem;
  }

  .page-about .about-timeline__track::before {
    content: "";
    position: absolute;
    left: 0.5rem;
    right: 0.5rem;
    top: 5px;
    height: 2px;
    background: linear-gradient(90deg, var(--sb-orange), var(--sb-cyan) 62%, var(--sb-amber));
    opacity: 0.9;
  }

  .page-about .about-node {
    margin-top: 2.5rem;
    padding-top: 1.4rem;
  }

  .page-about .about-node__dot {
    display: block;
    position: absolute;
    top: -2.5rem;
    left: 1.15rem;
    width: 12px;
    height: 12px;
    background: var(--sb-orange);
    transform: rotate(45deg);
    box-shadow: 0 0 0 4px rgba(11, 27, 43, 0.9);
  }

  .page-about .about-node:nth-child(2) .about-node__dot {
    background: var(--sb-orange-lt);
  }

  .page-about .about-node:nth-child(3) .about-node__dot {
    background: var(--sb-cyan);
  }

  .page-about .about-node:nth-child(4) .about-node__dot {
    background: var(--sb-amber);
  }

  .page-about .about-node__detail {
    grid-template-rows: 0fr;
    border-top-color: transparent;
    padding-top: 0;
    transition: grid-template-rows 0.38s ease, padding-top 0.38s ease, border-top-color 0.38s ease;
  }

  .page-about .about-node:hover .about-node__detail,
  .page-about .about-node:focus-within .about-node__detail {
    grid-template-rows: 1fr;
    border-top-color: rgba(47, 214, 198, 0.32);
    padding-top: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node__detail {
    transition: none;
  }

  .page-about .about-node__detail {
    grid-template-rows: 1fr;
  }
}