.page-about {
  --about-band: linear-gradient(90deg, var(--indigo) 0 32%, var(--red) 32% 64%, var(--gold) 64% 100%);
  background: var(--paper);
  color: var(--ink);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 clamp(40px, 6vw, 72px);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: min(560px, 72vw);
  height: min(560px, 72vw);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(18, 194, 180, .20), rgba(217, 161, 59, .12) 48%, rgba(18, 34, 74, 0) 72%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero .yf-wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .yf-crumb {
  margin-bottom: 18px;
}
.page-about .about-hero__frame {
  background: var(--paper-2);
  border: 1px solid var(--hair);
  padding: clamp(18px, 3vw, 42px);
  box-shadow: var(--shadow-tag);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  align-items: start;
}
.page-about .about-hero__title {
  margin: .4em 0 0;
  font-family: var(--display);
  font-size: clamp(1.9rem, 5.6vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -.02em;
}
.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 36rem;
  font-size: 1.0625rem;
  line-height: 1.8;
}
.page-about .about-hero__stats {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .about-hero__stats .yf-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--paper-2);
}
.page-about .about-hero__stats .yf-stat__num {
  font-family: var(--mono);
  font-size: clamp(1.4rem, 3vw, 1.95rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--indigo);
}
.page-about .about-hero__stats .yf-stat__unit {
  margin-left: .18em;
  font-size: .62em;
  font-weight: 400;
  color: var(--muted);
}
.page-about .about-hero__stats .yf-stat__label {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--muted);
}

/* 图片基础 */
.page-about .about-fig {
  margin: 0;
}
.page-about .about-fig .yf-media {
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--hair);
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .about-fig .yf-media__cap {
  margin-top: 10px;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 三色刻线带 ============ */
.page-about .about-band {
  height: 3px;
  background: var(--about-band);
}

/* ============ 时间线 ============ */
.page-about .about-timeline {
  padding: clamp(40px, 6vw, 80px) 0;
}
.page-about .about-rail {
  --about-mark: 48px;
  position: relative;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(36px, 5vw, 64px);
}
.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: calc(var(--about-mark) / 2 - 1px);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, rgba(217, 161, 59, .85), rgba(217, 161, 59, .12));
}
.page-about .about-rail__item {
  display: grid;
  grid-template-columns: var(--about-mark) minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 28px);
}
.page-about .about-rail__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 6px;
}
.page-about .about-rail__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(217, 161, 59, .16);
}
.page-about .about-rail__no {
  padding: 3px 5px;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--indigo);
  background: var(--paper-2);
  border: 1px solid var(--hair);
}
.page-about .about-rail__body {
  min-width: 0;
}
.page-about .about-rail__stage {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--red);
}
.page-about .about-rail__title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  line-height: 1.28;
  letter-spacing: -.01em;
}
.page-about .about-rail__text {
  margin: 14px 0 0;
  max-width: 62ch;
  line-height: 1.8;
}
.page-about .about-rail__text + .about-rail__text {
  margin-top: 10px;
}
.page-about .about-note {
  margin: 20px 0 0;
  padding: 14px 18px;
  border-left: 4px solid var(--red);
  background: linear-gradient(90deg, rgba(192, 52, 43, .07), rgba(255, 252, 247, 0));
  font-family: var(--display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.7;
  color: var(--indigo);
}

/* 三条线卡片 */
.page-about .about-lines {
  margin-top: 24px;
}
.page-about .about-line-card {
  padding: 18px;
  background: var(--paper-2);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-tag);
}
.page-about .about-line-card__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}
.page-about .about-line-card h4 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 1.0625rem;
}
.page-about .about-line-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-shift-fig {
  margin-top: 24px;
}

/* 工序与要求表 */
.page-about .about-spec {
  margin-top: 22px;
}
.page-about .about-spec .yf-table-wrap {
  overflow-x: auto;
}
.page-about .about-spec .yf-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: .9375rem;
}
.page-about .about-spec .yf-table caption {
  padding-bottom: 10px;
  text-align: left;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--muted);
}
.page-about .about-spec .yf-table th,
.page-about .about-spec .yf-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--hair-soft);
}
.page-about .about-spec .yf-table th {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
  border-bottom: 1px solid var(--hair);
}
.page-about .about-spec .yf-table td:first-child {
  font-weight: 700;
  color: var(--indigo);
  white-space: nowrap;
}
.page-about .about-spec .yf-table tbody tr:nth-child(odd) td {
  background: rgba(217, 161, 59, .05);
}

/* ============ 服务网络（深色区） ============ */
.page-about .about-network {
  position: relative;
  margin: clamp(36px, 5vw, 68px) 0;
  padding: clamp(36px, 5.2vw, 68px) 0;
  background: var(--indigo);
  color: var(--paper-2);
  overflow: hidden;
}
.page-about .about-network::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .055) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}
.page-about .about-network .yf-wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-network .yf-sec__eyebrow {
  color: var(--cyan);
}
.page-about .about-network .yf-sec__title {
  color: var(--paper-2);
}
.page-about .about-network .yf-sec__lead {
  color: rgba(255, 252, 247, .8);
}
.page-about .about-net__fig {
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-net__fig .yf-media {
  background: var(--indigo-2);
  border: 1px solid rgba(255, 255, 255, .16);
}
.page-about .about-net__fig .yf-media__cap {
  color: rgba(255, 252, 247, .66);
}

.page-about .about-zones {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}
.page-about .about-zone {
  padding: 18px;
  background: var(--indigo-2);
  border: 1px solid rgba(255, 255, 255, .12);
}
.page-about .about-zone__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}
.page-about .about-zone__name {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 1.0625rem;
  color: var(--paper-2);
}
.page-about .about-zone p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(255, 252, 247, .76);
}
.page-about .about-cities {
  margin-top: 24px;
}
.page-about .about-cities__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--cyan);
}
.page-about .about-cities ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-cities li {
  padding: 8px 14px;
  font-size: .9rem;
  color: var(--paper-2);
  border: 1px dashed rgba(217, 161, 59, .6);
}
.page-about .about-net__more {
  margin: clamp(22px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(255, 252, 247, .82);
}
.page-about .about-net__more a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 合作与长期客户 ============ */
.page-about .about-partners {
  padding: clamp(36px, 5vw, 72px) 0;
}
.page-about .about-partner-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 34px);
}
.page-about .about-partner {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--paper-2);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-tag);
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}
.page-about .about-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--red);
  transition: width .3s var(--ease);
}
.page-about .about-partner:hover,
.page-about .about-partner:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-tag-hover);
}
.page-about .about-partner:hover::before,
.page-about .about-partner:focus-within::before {
  width: 5px;
}
.page-about .about-partner__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(2rem, 4.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo);
}
.page-about .about-partner__num span {
  margin-left: .2em;
  font-size: .42em;
  font-weight: 400;
  color: var(--muted);
}
.page-about .about-partner h3 {
  margin: 10px 0 8px;
  font-family: var(--display);
  font-size: 1.0625rem;
}
.page-about .about-partner p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-cred {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) 0 0;
  list-style: none;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--hair);
}
.page-about .about-cred li {
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-cred strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--display);
  font-size: 1rem;
  color: var(--ink);
}

/* ============ 收束 ============ */
.page-about .about-close {
  padding: clamp(36px, 5vw, 72px) 0 clamp(48px, 7vw, 96px);
}
.page-about .about-close__box {
  position: relative;
  padding: clamp(22px, 3.6vw, 46px);
  background: var(--paper-2);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-tag);
  overflow: hidden;
}
.page-about .about-close__box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), var(--gold) 50%, var(--red));
}
.page-about .about-close__lead {
  margin: 14px 0 0;
  max-width: 62ch;
  line-height: 1.8;
}
.page-about .about-reasons {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}
.page-about .about-reasons li {
  padding-top: 14px;
  border-top: 1px solid var(--hair);
}
.page-about .about-reasons strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--display);
  font-size: 1.0625rem;
}
.page-about .about-reasons p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-close__actions {
  margin-top: clamp(24px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-close__links {
  margin: 18px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-close__links a {
  color: var(--indigo);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-underline-offset: 3px;
}

/* ============ 断点 ============ */
@media (min-width: 720px) {
  .page-about .about-zones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .about-cred {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(28px, 4vw, 52px);
  }
  .page-about .about-hero__fig {
    margin-top: 34px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-rail {
    --about-mark: 88px;
  }
  .page-about .about-rail__marker {
    padding-top: 4px;
  }
  .page-about .about-rail__no {
    font-size: .75rem;
  }
}

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