.page-about {
  --about-shadow: 10px 10px 0 rgba(4, 12, 20, 0.55);
  --about-shadow-sm: 6px 6px 0 rgba(4, 12, 20, 0.45);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.1rem, 3vw, 1.8rem) 0 clamp(2.2rem, 6vw, 3.8rem);
  background:
    radial-gradient(90% 70% at 92% 0%, rgba(47, 111, 191, 0.34), transparent 62%),
    linear-gradient(180deg, var(--night) 0%, var(--deep) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -18%;
  width: 62%;
  height: 170%;
  background: linear-gradient(158deg, rgba(200, 69, 50, 0.24), rgba(200, 69, 50, 0) 62%);
  transform: rotate(-14deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(46%, 360px);
  height: 5px;
  background: linear-gradient(90deg,
    var(--blue) 0 20%,
    var(--paper) 20% 40%,
    var(--red) 40% 60%,
    var(--green) 60% 80%,
    var(--yellow) 80% 100%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(1rem, 2.5vw, 1.6rem);
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  max-width: 14em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.95rem, 6.2vw, 3.8rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 1.1rem 0 0;
  max-width: 36em;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero__act {
  margin-top: 1.6rem;
}

/* 事实卡 */
.page-about .about-facts {
  position: relative;
  padding: 1.55rem 1.15rem 1.2rem;
  background: var(--cream);
  color: var(--ink-on-paper);
  border: 1px solid rgba(33, 26, 20, 0.28);
  box-shadow: var(--about-shadow);
}

.page-about .about-facts::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg,
    var(--blue) 0 20%,
    var(--paper) 20% 40%,
    var(--red) 40% 60%,
    var(--green) 60% 80%,
    var(--yellow) 80% 100%);
  border-bottom: 1px solid rgba(33, 26, 20, 0.18);
}

.page-about .about-facts__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink-on-paper-soft);
}

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

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.9rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--line-on-paper);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-on-paper);
  white-space: nowrap;
}

.page-about .about-facts__label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--ink-on-paper-soft);
  text-align: right;
}

.page-about .about-facts__copy {
  margin-top: 0.9rem;
  width: 100%;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-sect {
  padding: clamp(2.2rem, 6vw, 4rem) 0;
}

.page-about .about-sect + .about-sect {
  border-top: 1px solid var(--line);
}

.page-about .about-sect__head {
  max-width: 46em;
}

.page-about .about-sect__head--tight {
  max-width: 40em;
}

.page-about .about-sect h2 {
  margin: 0.5rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.8vw, 2.35rem);
  line-height: 1.26;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-about .about-sect__lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 历程 ---------- */
.page-about .about-tl__body {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-tl__tabs {
  min-width: 0;
}

.page-about .about-tl__list {
  position: relative;
  margin: 1.1rem 0 0;
  padding: 0 0 0 1.55rem;
  list-style: none;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  left: 0.33rem;
  top: 0.45rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(51, 194, 200, 0.12));
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 1.35rem;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.55rem;
  top: 0.42rem;
  width: 0.68rem;
  height: 0.68rem;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-tl__item h3 {
  margin: 0.28rem 0 0.4rem;
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-tl__item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-tl__fig {
  margin: 0;
  border: 1px solid var(--line-strong);
  box-shadow: var(--about-shadow-sm);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope__grid {
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-scope__card {
  position: relative;
  padding: 1.3rem 1.15rem 1.35rem;
  background: var(--deep);
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
}

.page-about .about-scope__card:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-scope__card:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-scope__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.page-about .about-scope__h {
  margin: 0.55rem 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  line-height: 1.38;
  color: var(--paper);
}

.page-about .about-scope__p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-scope__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1rem 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.6rem);
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-team__tabs {
  min-width: 0;
}

.page-about .about-team__tabs .tabs__panel h3 {
  margin: 1.1rem 0 0.55rem;
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-team__tabs .tabs__panel p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-team__list {
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__list li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.2rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 0.42rem;
  height: 0.42rem;
  background: var(--green);
}

.page-about .about-team__fig {
  margin: 0;
  border: 1px solid var(--line-strong);
  box-shadow: var(--about-shadow-sm);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-flow__panel {
  position: relative;
  padding: clamp(1.4rem, 4vw, 2.6rem);
  background:
    repeating-linear-gradient(90deg, rgba(248, 243, 231, 0.05) 0 1px, transparent 1px 64px),
    var(--deep);
  border: 1px solid var(--line-strong);
  box-shadow: var(--about-shadow);
}

.page-about .about-flow__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, var(--amber), var(--cyan));
}

.page-about .about-flow__steps {
  display: grid;
  gap: 1.2rem;
  margin: clamp(1.3rem, 3vw, 1.9rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  padding: 0.9rem 0 0.9rem 1rem;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-flow__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-flow__step h3 {
  margin: 0.35rem 0 0.4rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 低带宽 ---------- */
.page-about .about-lowband__grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
  align-items: start;
}

.page-about .about-lowband__fig {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--line-strong);
  box-shadow: var(--about-shadow-sm);
  overflow: hidden;
}

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

.page-about .about-lowband__body h2 {
  margin: 0.5rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.8vw, 2.2rem);
  line-height: 1.26;
  color: var(--paper);
}

.page-about .about-lowband__body p {
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-lowband__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-lowband__stats li {
  padding: 0.75rem 0.5rem;
  text-align: center;
  background: rgba(51, 194, 200, 0.08);
  border: 1px solid rgba(51, 194, 200, 0.32);
}

.page-about .about-lowband__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2.4vw, 1.15rem);
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-lowband__cap {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--ink-faint);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-partners__card {
  padding: 1.2rem 1.1rem 1.25rem;
  background: var(--cream);
  color: var(--ink-on-paper);
  border: 1px solid rgba(33, 26, 20, 0.25);
  box-shadow: var(--about-shadow-sm);
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink-on-paper);
}

.page-about .about-partners__card h3 {
  margin: 0.55rem 0 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-on-paper);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink-on-paper-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
}

.page-about .about-next__panel {
  padding: clamp(1.4rem, 4vw, 2.4rem);
  background: linear-gradient(140deg, rgba(47, 111, 191, 0.2), transparent 60%), var(--deep);
  border: 1px solid var(--line-strong);
}

.page-about .about-next__panel h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-next__panel > p {
  margin: 0;
  max-width: 46em;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.3rem;
}

.page-about .about-next__note {
  margin: 1.1rem 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-faint);
}

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

.page-about .about-next__note a:hover {
  color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-scope__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-scope__card:nth-child(2) {
    margin-top: 1.6rem;
  }

  .page-about .about-scope__card:nth-child(3) {
    margin-top: 3.2rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-tl__body {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-team__fig {
    margin-top: 0.4rem;
  }

  .page-about .about-lowband__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (max-width: 420px) {
  .page-about .about-lowband__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}