.page-about {
  --about-line: rgba(11, 31, 58, 0.12);
  --about-shadow: 0 26px 54px -40px rgba(11, 31, 58, 0.75);
  position: relative;
  color: var(--graphite);
  background: var(--mist);
  overflow-x: hidden;
}

.page-about .about-crumb-current {
  color: var(--navy);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.6rem, 3.4vw, 2.6rem) 0 clamp(2.4rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -34% -12% auto -12%;
  height: 130%;
  background:
    radial-gradient(50% 56% at 16% 24%, rgba(127, 212, 255, 0.45), transparent 62%),
    radial-gradient(44% 50% at 86% 30%, rgba(255, 122, 26, 0.26), transparent 64%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-hero__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.7rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin: 0.6rem 0 1.1rem;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.page-about .about-hero__aside {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  padding: clamp(1.4rem, 3.2vw, 2.1rem);
  color: var(--white);
  background: linear-gradient(152deg, var(--navy) 0%, var(--navy-deep) 58%, #1c3f70 100%);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__aside::after {
  content: "";
  position: absolute;
  right: -22%;
  top: -34%;
  width: 62%;
  padding-bottom: 62%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 26, 0.34), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__quote {
  position: relative;
  z-index: 1;
  margin: 0 0 0.5rem;
  font-family: var(--serif);
  font-size: clamp(1.12rem, 2.2vw, 1.42rem);
  line-height: 1.65;
}

.page-about .about-hero__sign {
  position: relative;
  z-index: 1;
  margin: 0 0 1.35rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-stats__value {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.8vw, 1.68rem);
  color: var(--orange);
  line-height: 1.1;
}

.page-about .about-stats__unit {
  font-size: 0.78em;
}

.page-about .about-stats__label {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 目录 ---------- */
.page-about .about-index {
  padding-top: 0;
}

.page-about .about-index__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list .index-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num label"
    "num note";
  align-items: center;
  gap: 0.15rem 0.8rem;
  padding: 0.85rem 0.95rem;
  border: var(--about-line);
  border-radius: var(--r-sm);
  background: var(--white);
  text-decoration: none;
  color: inherit;
  transition: transform 0.26s ease, border-color 0.26s ease, box-shadow 0.26s ease;
}

.page-about .about-index__list .index-link:hover,
.page-about .about-index__list .index-link:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(255, 122, 26, 0.5);
  box-shadow: 0 18px 34px -28px rgba(11, 31, 58, 0.8);
}

.page-about .about-index__label {
  grid-area: label;
  font-weight: 600;
  color: var(--navy);
  font-size: 0.98rem;
}

.page-about .about-index__list .index-link__num {
  grid-area: num;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-index__list .index-link__note {
  grid-area: note;
  font-size: 0.84rem;
  color: #6a7686;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-wrap {
  position: relative;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding: clamp(0.6rem, 2vw, 1.4rem) 0;
  overflow: hidden;
}

.page-about .about-tl-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.13;
  border-radius: var(--r-lg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-tl {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 0 0 2.15rem;
  list-style: none;
  display: grid;
  gap: clamp(1rem, 3vw, 1.5rem);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0.58rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.page-about .about-tl__item {
  position: relative;
  background: var(--white);
  border: var(--about-line);
  border-radius: var(--r-md);
  padding: clamp(1rem, 2.4vw, 1.5rem);
  box-shadow: 0 20px 42px -38px rgba(11, 31, 58, 0.8);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.95rem;
  top: 1.45rem;
  width: 0.78rem;
  height: 0.78rem;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--orange);
  transition: background 0.26s ease, transform 0.26s ease;
}

.page-about .about-tl__item:hover,
.page-about .about-tl__item:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 30px 56px -38px rgba(11, 31, 58, 0.85);
}

.page-about .about-tl__item:hover::before {
  background: var(--orange);
  transform: scale(1.18);
}

.page-about .about-tl__year {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.2rem 0.68rem;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #8a3f00;
  background: var(--orange-light);
}

.page-about .about-tl__title {
  margin: 0 0 0.45rem;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
  color: var(--navy);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.8;
}

.page-about .about-timeline__more {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0 0;
  font-size: 0.95rem;
  color: #55606f;
}

.page-about .about-timeline__more a {
  color: var(--navy);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 4px;
}

/* ---------- 青海服务网络 ---------- */
.page-about .about-network {
  background: linear-gradient(180deg, rgba(232, 237, 243, 0.55), rgba(246, 248, 251, 0));
}

.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-map {
  border-radius: var(--r-lg);
  padding: clamp(1rem, 2.6vw, 1.75rem);
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-deep) 72%);
  box-shadow: var(--about-shadow);
}

.page-about .about-map svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-map__shape {
  fill: rgba(127, 212, 255, 0.13);
  stroke: rgba(127, 212, 255, 0.5);
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.page-about .about-map__node circle {
  fill: var(--orange);
  transition: fill 0.25s ease, r 0.25s ease;
}

.page-about .about-map__node:hover circle,
.page-about .about-map__node:focus-within circle {
  fill: var(--white);
  r: 9;
}

.page-about .about-map__label {
  fill: rgba(255, 255, 255, 0.82);
  font-family: var(--sans);
  font-size: 13px;
  text-anchor: middle;
  letter-spacing: 0.06em;
}

.page-about .about-network__info .section__title {
  margin: 0.5rem 0 0.9rem;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 3.2vw, 2.1rem);
  line-height: 1.3;
  color: var(--navy);
}

.page-about .about-network__info .section__lede {
  margin: 0;
  max-width: 52ch;
  line-height: 1.85;
}

.page-about .about-network__list {
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.page-about .about-network__list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.8rem;
  border-radius: var(--r-sm);
  background: var(--white);
  border: var(--about-line);
  font-size: 0.92rem;
  color: var(--navy);
}

.page-about .about-network__list li::before {
  content: "";
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--orange);
  flex: none;
}

.page-about .about-network__note {
  margin: 1.1rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #5c6775;
}

.page-about .about-network__figure {
  margin: clamp(1.8rem, 4.5vw, 3rem) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-eco__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.6rem);
}

.page-about .about-eco__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

.page-about .about-eco__body .section__title {
  margin: 0.5rem 0 0.9rem;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 3.2vw, 2.1rem);
  line-height: 1.3;
  color: var(--navy);
}

.page-about .about-eco__body .section__lede {
  margin: 0;
  max-width: 52ch;
  line-height: 1.85;
}

.page-about .about-steps {
  counter-reset: step;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-steps li {
  counter-increment: step;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  border-radius: var(--r-sm);
  background: var(--white);
  border: var(--about-line);
  font-size: 0.94rem;
  line-height: 1.7;
}

.page-about .about-steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--orange);
  line-height: 1.9;
  flex: none;
}

.page-about .about-eco__roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-role {
  padding: clamp(1.15rem, 2.6vw, 1.6rem);
  border-radius: var(--r-md);
  background: var(--white);
  border: var(--about-line);
  border-left: 4px solid var(--orange);
  box-shadow: 0 22px 44px -42px rgba(11, 31, 58, 0.9);
}

.page-about .about-role__title {
  margin: 0 0 0.5rem;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-eco__note {
  margin: clamp(1.4rem, 3.5vw, 2rem) 0 0;
  padding: 1rem 1.2rem;
  border-radius: var(--r-sm);
  background: var(--silver-soft);
  font-size: 0.94rem;
  line-height: 1.8;
  color: #4c5766;
}

/* ---------- 团队与服务能力 ---------- */
.page-about .about-teams {
  background: linear-gradient(180deg, rgba(232, 237, 243, 0.5), rgba(246, 248, 251, 0));
}

.page-about .about-teams__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: clamp(1.4rem, 3.5vw, 2rem);
}

.page-about .about-team {
  position: relative;
  padding: clamp(1.2rem, 2.8vw, 1.8rem);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, var(--white) 0%, var(--silver-soft) 100%);
  border: var(--about-line);
  overflow: hidden;
}

.page-about .about-team::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -28%;
  width: 52%;
  padding-bottom: 52%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(127, 212, 255, 0.32), transparent 70%);
  pointer-events: none;
}

.page-about .about-team__idx {
  position: relative;
  z-index: 1;
  display: block;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--navy-deep);
  opacity: 0.6;
  margin-bottom: 0.6rem;
}

.page-about .about-team__title {
  position: relative;
  z-index: 1;
  margin: 0 0 0.5rem;
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-team__text {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-flow-wrap {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .about-flow__label {
  margin: 0 0 0.8rem;
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: #6a7686;
}

.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 0.5rem;
  counter-reset: flow;
}

.page-about .about-flow__step {
  counter-increment: flow;
  padding: 0.9rem 0.6rem;
  border-radius: var(--r-sm);
  background: var(--navy);
  color: var(--white);
  font-size: 0.92rem;
  text-align: center;
  letter-spacing: 0.04em;
}

.page-about .about-flow__step::before {
  content: counter(flow, decimal-leading-zero);
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--orange);
}

/* ---------- 品牌承诺 ---------- */
.page-about .about-pledge-section {
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-pledge {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  padding: clamp(1.6rem, 4.5vw, 3.2rem);
  color: var(--white);
  background: linear-gradient(140deg, var(--navy) 0%, var(--navy-deep) 56%, #1a3a68 100%);
}

.page-about .about-pledge::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -38%;
  width: 48%;
  padding-bottom: 48%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 26, 0.38), transparent 68%);
  pointer-events: none;
}

.page-about .eyebrow--on-dark {
  color: var(--cyan);
}

.page-about .about-pledge__title {
  position: relative;
  z-index: 1;
  margin: 0.6rem 0 0.9rem;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.3;
}

.page-about .about-pledge__lede {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-pledge__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .about-pledge__item {
  padding: 1.1rem 1.2rem;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-pledge__value {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .about-pledge__name {
  margin: 0.4rem 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-pledge__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-pledge__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.2rem);
}

.page-about .about-btn--on-dark {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.35);
}

.page-about .about-btn--on-dark:hover,
.page-about .about-btn--on-dark:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-index__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .about-eco__split {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 3.5rem);
  }
}

@media (min-width: 960px) {
  .page-about .about-tl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 4rem;
    row-gap: 1.8rem;
    padding-left: 0;
    grid-auto-flow: row dense;
  }

  .page-about .about-tl::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-tl__item:nth-child(odd) {
    grid-column: 1;
    text-align: right;
  }

  .page-about .about-tl__item:nth-child(even) {
    grid-column: 2;
    text-align: left;
  }

  .page-about .about-tl__item:nth-child(odd)::before {
    left: auto;
    right: -2.39rem;
  }

  .page-about .about-tl__item:nth-child(even)::before {
    left: -2.39rem;
    right: auto;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__aside {
    padding: 2.3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-index__list .index-link,
  .page-about .about-tl__item::before,
  .page-about .about-map__node circle {
    transition: none;
  }

  .page-about .about-tl__item:hover,
  .page-about .about-index__list .index-link:hover {
    transform: none;
  }
}