.page-about {
  --about-gap: clamp(52px, 7vw, 92px);
  --about-anchor: calc(var(--rail-h) + var(--nav-h) + 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3.4vw, 32px) 0 clamp(44px, 6.5vw, 82px);
  background:
    radial-gradient(90% 72% at 94% 2%, rgba(26, 110, 168, .17), transparent 62%),
    radial-gradient(72% 60% at 2% 98%, rgba(255, 107, 74, .10), transparent 60%),
    linear-gradient(180deg, #F7F9FB 0%, #EDF3F9 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(11, 46, 79, .055) 1px, transparent 1px);
  background-size: 88px 100%;
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__copy {
  max-width: 780px;
}

.page-about .about-eyebrow {
  margin: clamp(20px, 3vw, 30px) 0 14px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about h1 {
  margin: 0;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--deep);
  max-width: 20ch;
}

.page-about .about-lead {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-facts li {
  border-top: 2px solid var(--coral);
  padding-top: 10px;
}

.page-about .about-facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.2;
  color: var(--deep);
}

.page-about .about-facts span {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__fig {
  margin: clamp(28px, 4.4vw, 48px) 0 0;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

/* ---------- 左右对照骨架 ---------- */
.page-about .about-frame {
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-aside {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(36px, 6vw, 56px);
}

.page-about .about-creed {
  position: relative;
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(158deg, var(--deep) 0%, var(--midnight) 100%);
  color: #E4EEF7;
  overflow: hidden;
}

.page-about .about-creed::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(112% 82% at 102% -4%, rgba(255, 107, 74, .24), transparent 58%);
  pointer-events: none;
}

.page-about .about-creed > * {
  position: relative;
  z-index: 1;
}

.page-about .about-creed__mark {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-creed__text {
  margin: 14px 0 0;
  font-size: clamp(20px, 2.6vw, 25px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-creed__sub {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(228, 238, 247, .78);
}

.page-about .about-creed .btn {
  margin-top: 20px;
}

.page-about .about-jump {
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 16px 18px 10px;
  background: #FFFFFF;
}

.page-about .about-jump__h {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

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

.page-about .about-jump a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--sea);
  text-decoration: none;
  border-bottom: 1px solid var(--line-light);
  transition: color .24s var(--ease), padding-left .24s var(--ease);
}

.page-about .about-jump li:last-child a {
  border-bottom: 0;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--coral-deep);
  padding-left: 6px;
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-block {
  scroll-margin-top: var(--about-anchor);
}

.page-about .about-block .section-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .prose p {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .prose p + p {
  margin-top: 1.05em;
}

/* ---------- 服务半径 ---------- */
.page-about .radius {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .radius-map {
  position: relative;
  width: min(100%, 320px);
  aspect-ratio: 1 / 1;
  margin: 34px auto 0;
}

.page-about .radius-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed rgba(26, 110, 168, .42);
}

.page-about .radius-ring--out {
  width: 100%;
  height: 100%;
}

.page-about .radius-ring--mid {
  width: 66%;
  height: 66%;
}

.page-about .radius-ring--in {
  width: 34%;
  height: 34%;
  border: 2px solid var(--coral);
  background: radial-gradient(circle at 50% 50%, rgba(255, 107, 74, .16), transparent 72%);
}

.page-about .radius-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--deep);
}

.page-about .radius-ring__label {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--pearl);
  border: 1px solid var(--sea-soft);
  font-size: 11px;
  line-height: 1.5;
  color: var(--sea);
  white-space: nowrap;
  cursor: default;
  transition: background-color .24s var(--ease), color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .radius-ring__label:hover,
.page-about .radius-ring__label:focus-within {
  background: var(--coral-soft);
  border-color: var(--coral);
  color: var(--coral-deep);
}

.page-about .radius-ring__pop {
  position: absolute;
  top: calc(100% + 9px);
  left: 50%;
  transform: translate(-50%, 4px);
  width: max-content;
  max-width: 210px;
  padding: 9px 11px;
  border-radius: 10px;
  background: var(--midnight);
  color: #DCE8F2;
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.65;
  text-align: left;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 5;
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
}

.page-about .radius-ring__label:hover .radius-ring__pop,
.page-about .radius-ring__label:focus-within .radius-ring__pop {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.page-about .radius-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .radius-list li {
  padding-left: 16px;
  border-left: 2px solid var(--sea-soft);
  transition: border-color .26s var(--ease);
}

.page-about .radius-list li:hover {
  border-color: var(--coral);
}

.page-about .radius-list b {
  display: block;
  font-size: 16px;
  color: var(--deep);
}

.page-about .radius-list p {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 内容复核流程 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #FFFFFF;
  transition: border-color .26s var(--ease);
}

.page-about .flow-steps li:hover {
  border-color: var(--coral);
}

.page-about .flow-steps__n {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--coral-deep);
  background: var(--coral-soft);
  border: 1px solid rgba(255, 107, 74, .35);
}

.page-about .flow-steps h3 {
  margin: 0;
  font-size: 16.5px;
  color: var(--deep);
}

.page-about .flow-steps p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .process-fig {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
}

.page-about .process-fig img,
.page-about .timeline-fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

/* ---------- 运营阶段时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--sea-soft) 70%, transparent 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 40px);
}

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

.page-about .timeline__node {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pearl);
  border: 2px solid var(--gold);
  transition: background-color .28s var(--ease), border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .timeline__item:hover .timeline__node {
  background: var(--coral);
  border-color: var(--coral);
  box-shadow: 0 0 0 5px var(--coral-soft);
}

.page-about .timeline__when {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: 8px 0 0;
  font-size: clamp(17px, 2.1vw, 20px);
  font-weight: 700;
  color: var(--deep);
  transition: color .26s var(--ease);
}

.page-about .timeline__item:hover .timeline__title {
  color: var(--coral-deep);
}

.page-about .timeline__text {
  margin: 9px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .timeline-fig {
  margin: clamp(26px, 3.6vw, 38px) 0 0;
}

/* ---------- 服务标准 ---------- */
.page-about .std-panel {
  position: relative;
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 44px);
  background: linear-gradient(158deg, var(--deep) 0%, var(--midnight) 100%);
  color: #E4EEF7;
  overflow: hidden;
}

.page-about .std-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(255, 255, 255, .07) 1px, transparent 1px);
  background-size: 88px 100%;
  pointer-events: none;
}

.page-about .std-panel > * {
  position: relative;
  z-index: 1;
}

.page-about .std-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .std-list li {
  border: 1px solid var(--line-dark);
  background: var(--glass);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  transition: border-color .28s var(--ease), background-color .28s var(--ease);
}

.page-about .std-list li:hover {
  border-color: var(--coral);
  background: var(--glass-strong);
}

.page-about .std-list__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--coral);
}

.page-about .std-list h3 {
  margin: 9px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
}

.page-about .std-list p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(228, 238, 247, .78);
}

.page-about .std-cta {
  margin-top: clamp(22px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 920px;
  }
}

@media (min-width: 760px) {
  .page-about .std-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .radius {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .radius-map {
    margin-top: 20px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-frame {
    display: grid;
    grid-template-columns: minmax(230px, 292px) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 68px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--rail-h) + var(--nav-h) + 28px);
    margin-bottom: 0;
  }
}

@media (max-width: 560px) {
  .page-about .radius-map {
    width: min(100%, 250px);
  }

  .page-about .radius-ring__label {
    font-size: 10.5px;
    padding: 2px 7px;
  }

  .page-about .radius-ring__pop {
    max-width: 160px;
    font-size: 11.5px;
  }
}

@media (hover: none) {
  .page-about .radius-ring__pop {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .radius-ring__pop,
  .page-about .timeline__node,
  .page-about .flow-steps li,
  .page-about .std-list li {
    transition: none;
  }
}