.page-about {
  --about-radius: var(--r-lg);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 48px) clamp(38px, 7vw, 86px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(20, 227, 210, .16), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 122, 44, .12), transparent 60%),
    var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(18px, 4vw, 36px);
  margin-top: clamp(20px, 3.4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
  max-width: 15em;
}

.page-about .about-hero__intro {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(76px, 19vw, 190px);
  line-height: .82;
  letter-spacing: -.07em;
  color: rgba(20, 227, 210, .13);
  -webkit-text-stroke: 1px rgba(20, 227, 210, .42);
  text-align: right;
  user-select: none;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
  }
  .page-about .about-hero__year {
    text-align: left;
    margin-bottom: -.1em;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-index {
  position: static;
}

.page-about .about-index nav ul {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 10px 0 0;
  padding: 0 0 6px;
  list-style: none;
  scrollbar-width: thin;
}

.page-about .about-index nav a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13.5px;
  color: var(--silver);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-index nav a:hover,
.page-about .about-index nav a[aria-current="true"] {
  color: var(--white);
  border-color: var(--line-strong);
  background: rgba(20, 227, 210, .1);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }
  .page-about .about-index nav ul {
    display: block;
    overflow: visible;
    padding: 0;
    margin-top: 14px;
  }
  .page-about .about-index nav li + li {
    margin-top: 4px;
  }
  .page-about .about-index nav a {
    display: block;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 8px 0 8px 14px;
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .about-index nav a:hover,
  .page-about .about-index nav a[aria-current="true"] {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(20, 227, 210, .12), transparent 78%);
    color: var(--white);
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  margin-top: clamp(30px, 5vw, 62px);
  padding-top: clamp(28px, 4.6vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-block:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--graphite);
}

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

.page-about .about-media--photo {
  aspect-ratio: 3 / 2;
}

.page-about .about-media--team {
  aspect-ratio: 10 / 7;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-media__cap {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-media figcaption.about-media__cap {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: rgba(15, 30, 37, .9);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(20px, 3.4vw, 38px);
}

.page-about .about-origin__text p {
  margin: 0 0 1.1em;
}

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

@media (min-width: 840px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

.page-about .about-era-card {
  margin-top: clamp(24px, 3.6vw, 40px);
  display: grid;
  gap: 1px;
  border: 1px solid rgba(198, 210, 216, .22);
  border-radius: var(--r-sm);
  background:
    linear-gradient(180deg, rgba(255, 217, 191, .07), rgba(255, 217, 191, .015)),
    repeating-linear-gradient(0deg, rgba(198, 210, 216, .055) 0 1px, transparent 1px 7px);
  overflow: hidden;
}

@media (min-width: 700px) {
  .page-about .about-era-card {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-era-card__item + .about-era-card__item {
    border-left: 1px solid rgba(198, 210, 216, .16);
  }
}

.page-about .about-era-card__item {
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .about-era-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-era-card__value {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  letter-spacing: .01em;
  color: var(--white);
}

.page-about .about-era-card__note {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  border-top: 0;
  margin-top: clamp(34px, 5.4vw, 68px);
  padding: clamp(24px, 4vw, 46px);
  border-radius: var(--about-radius);
  background: var(--graphite);
  overflow: hidden;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .17;
  filter: saturate(.65);
}

.page-about .about-timeline > *:not(.about-timeline__bg) {
  position: relative;
  z-index: 1;
}

.page-about .about-tl-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 28px) 0 clamp(22px, 3.4vw, 34px);
  padding: 0;
  list-style: none;
}

.page-about .about-tl-nav a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--silver);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-tl-nav a .mono {
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: .1em;
}

.page-about .about-tl-nav a:hover {
  color: var(--white);
  border-color: var(--line-strong);
  background: rgba(20, 227, 210, .1);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(20, 227, 210, .6), rgba(47, 194, 166, .38) 52%, rgba(255, 122, 44, .42));
}

.page-about .about-stage {
  position: relative;
  padding-left: clamp(30px, 5vw, 42px);
  padding-block: clamp(13px, 2.2vw, 20px);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(13px, 2.2vw, 20px) + 5px);
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  animation: about-node 2.4s var(--ease) infinite;
}

@keyframes about-node {
  0%, 100% { box-shadow: 0 0 0 4px rgba(20, 227, 210, .1); }
  50% { box-shadow: 0 0 0 10px rgba(20, 227, 210, .02); }
}

.page-about .about-stage__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-stage__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.3vw, 23px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-stage__sum {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-stage__more {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-stage__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .32s var(--ease), opacity .26s var(--ease), margin-top .32s var(--ease);
  }
  .page-about .about-stage:hover .about-stage__more,
  .page-about .about-stage:focus-within .about-stage__more {
    max-height: 12em;
    opacity: 1;
    margin-top: 8px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(22px, 3.4vw, 34px);
}

@media (min-width: 780px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 28px) calc(clamp(18px, 2.6vw, 28px) + 8px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(15, 30, 37, .9), rgba(6, 15, 20, .9));
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(18px, 2.6vw, 28px);
  bottom: clamp(18px, 2.6vw, 28px);
  width: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .about-role--retail::before { background: var(--orange); }
.page-about .about-role--biz::before { background: var(--cyan); }
.page-about .about-role--service::before { background: var(--teal); }
.page-about .about-role--ops::before { background: var(--mist); }

.page-about .about-role:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-about .about-role__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-role__num span {
  font-size: .42em;
  margin-left: 5px;
  color: var(--mist);
}

.page-about .about-role__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 协同（浅色区） ---------- */
.page-about .about-journey {
  border-top: 0;
  margin-top: clamp(34px, 5.4vw, 68px);
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--about-radius);
  background: var(--light);
}

.page-about .about-journey .eyebrow {
  color: #2E6E68;
}

.page-about .about-journey .section-title {
  color: #08191F;
}

.page-about .about-journey .section-lead {
  color: #3E555F;
}

.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-radius: var(--r-md);
  overflow: hidden;
  background: rgba(8, 25, 31, .12);
}

@media (min-width: 820px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-step {
  padding: clamp(18px, 2.6vw, 26px);
  background: #FFFFFF;
}

.page-about .about-step__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: #1D7F76;
}

.page-about .about-step__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: #08191F;
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: #3E555F;
}

/* ---------- 生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 30px);
}

@media (min-width: 820px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }
}

.page-about .about-eco__heading {
  margin: 0 0 clamp(14px, 2.4vw, 20px);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tag {
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 14px;
  line-height: 1.5;
  color: var(--silver);
  background: rgba(15, 30, 37, .7);
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-tag--cyan {
  border-color: rgba(20, 227, 210, .38);
  color: var(--cyan-soft);
  background: rgba(20, 227, 210, .08);
}

.page-about .about-tag:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.page-about .about-clients {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-clients li {
  padding: 13px 2px;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
  color: var(--silver);
}

.page-about .about-clients li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 11px;
  border-radius: 50%;
  background: var(--teal);
  vertical-align: middle;
}

.page-about .about-eco__note {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 开始合作 ---------- */
.page-about .about-paths {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  margin-top: clamp(18px, 3vw, 28px);
}

@media (min-width: 800px) {
  .page-about .about-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-path {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(15, 30, 37, .92), rgba(6, 15, 20, .92));
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-path--primary {
  border-color: rgba(255, 122, 44, .42);
  background:
    linear-gradient(180deg, rgba(255, 122, 44, .1), rgba(6, 15, 20, .92) 62%),
    var(--graphite);
}

.page-about .about-path:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-about .about-path__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-path__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.5vw, 23px);
  font-weight: 800;
  color: var(--white);
}

.page-about .about-path__text {
  margin: 0;
  font-size: 15.2px;
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-path__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 227, 210, .42);
}

.page-about .about-path__text a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-path__cta {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
}

/* ---------- 返回顶部 ---------- */
.page-about .about-totop {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 40;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(15, 30, 37, .92);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: transform .22s var(--ease), background-color .22s var(--ease), color .22s var(--ease);
}

.page-about .about-totop:hover {
  transform: translateY(-3px);
  background: rgba(20, 227, 210, .16);
  color: var(--white);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage::before {
    animation: none;
  }
  .page-about .about-role,
  .page-about .about-path,
  .page-about .about-tag,
  .page-about .about-totop,
  .page-about .about-stage__more {
    transition: none;
  }
  .page-about .about-role:hover,
  .page-about .about-path:hover,
  .page-about .about-tag:hover,
  .page-about .about-totop:hover {
    transform: none;
  }
  @media (hover: hover) and (min-width: 900px) {
    .page-about .about-stage__more {
      max-height: none;
      opacity: 1;
      margin-top: 8px;
    }
  }
}