.page-about {
  --about-paper-ink: #142A3A;
  --about-soft-ink: #3C4F5C;
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 面包屑 / 页眉线 ---------- */
.page-about .about-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: baseline;
  justify-content: space-between;
  padding-block: clamp(18px, 3vw, 28px) 0;
}
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cool);
}
.page-about .about-crumbs a {
  color: var(--cool);
  text-decoration: none;
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
}
.page-about .about-topline__idx {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cool);
}
.page-about .about-topline__idx .num {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 4.5vw, 52px) clamp(34px, 5.5vw, 70px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 78% at 80% 8%, rgba(21, 224, 200, .16), transparent 60%),
    radial-gradient(90% 60% at 4% 92%, rgba(255, 154, 60, .10), transparent 66%);
  pointer-events: none;
}
.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7.4vw, 82px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: rgba(244, 239, 228, .84);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--slate);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06) brightness(.88);
}
.page-about .about-hero__stat {
  position: absolute;
  left: 0;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 12px 18px;
  background: linear-gradient(90deg, rgba(5, 13, 20, .94), rgba(5, 13, 20, .32));
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cool);
}
.page-about .about-hero__stat-v {
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}
.page-about .about-hero__numbers {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.page-about .about-hero__num {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .about-hero__num .num {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
}
.page-about .about-hero__num span:last-child {
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cool);
}

/* ---------- 章节导航条 ---------- */
.page-about .about-index {
  border-block: 1px solid var(--line);
  background: rgba(5, 13, 20, .55);
}
.page-about .about-index__inner {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  padding-block: 13px;
  scrollbar-width: thin;
}
.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding-bottom: 3px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .about-index__link .num {
  font-size: 11.5px;
  color: var(--cyan);
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

/* ---------- 通用区块头 ---------- */
.page-about .about-sec-head {
  margin-bottom: clamp(24px, 4vw, 42px);
}
.page-about .about-sec-head__text,
.page-about .about-sec-head__side {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--cool);
}
.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 3.8vw, 46px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

/* ---------- 01 入口原则 ---------- */
.page-about .about-positioning {
  padding-block: clamp(42px, 6vw, 84px);
}
.page-about .about-doors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .about-door {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(20, 42, 58, .92), rgba(11, 27, 43, .55));
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}
.page-about .about-door:hover {
  transform: translateY(-3px);
  border-color: rgba(21, 224, 200, .55);
}
.page-about .about-door__idx {
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
}
.page-about .about-door__title {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .about-door__text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--cool);
}
.page-about .about-door__link {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(21, 224, 200, .4);
  padding-bottom: 3px;
}
.page-about .about-door__link:hover,
.page-about .about-door__link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-milestones {
  position: relative;
  padding-block: clamp(40px, 6vw, 80px);
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(5, 13, 20, .55), transparent 34%),
    repeating-linear-gradient(90deg, rgba(143, 163, 176, .06) 0 1px, transparent 1px 120px);
}
.page-about .about-sec-head--split {
  display: grid;
  gap: 8px;
}
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(22px, 3.5vw, 34px);
}
.page-about .about-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cool);
  text-decoration: none;
  scroll-margin-top: 90px;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.page-about .about-chip:hover,
.page-about .about-chip:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
}
.page-about .about-chip:target {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
  font-weight: 600;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}
.page-about .about-track__item {
  position: relative;
  padding-left: 26px;
}
.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 16px;
  bottom: calc(-1 * clamp(16px, 2.4vw, 22px));
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(143, 163, 176, 0));
}
.page-about .about-track__item:last-child::before {
  display: none;
}
.page-about .about-track__item::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  border: 1px solid var(--cyan);
  background: var(--ink);
}
.page-about .about-node {
  padding: 18px 18px 17px;
  border: 1px solid var(--line);
  background: rgba(20, 42, 58, .58);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}
.page-about .about-node__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
}
.page-about .about-node__meta .num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .about-node__tag {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 1px solid rgba(255, 154, 60, .45);
  padding: 2px 8px;
}
.page-about .about-node__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--cool);
}
.page-about .about-node__side {
  margin: 14px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--slate);
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(143, 163, 176, .85);
}

/* ---------- 03 团队与分工（暖纸） ---------- */
.page-about .about-team {
  padding-block: clamp(42px, 6vw, 84px);
  background: var(--paper);
  color: var(--about-paper-ink);
  border-block: 1px solid var(--paper-line);
}
.page-about .about-team .eyebrow {
  color: #556A78;
}
.page-about .about-team .about-h2 {
  color: var(--ink);
}
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}
.page-about .about-team__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--about-soft-ink);
}
.page-about .about-org {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-org__unit {
  padding: 14px 16px 15px;
  background: #FFFFFF;
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--cyan);
}
.page-about .about-org__unit-k {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: #7B8B96;
}
.page-about .about-org__unit-t {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .about-org__unit-p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--about-soft-ink);
}
.page-about .about-team__fig {
  margin: 0;
  background: var(--slate);
  border: 1px solid var(--paper-line);
}
.page-about .about-team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.9) contrast(1.05);
}
.page-about .about-team__fig-cap {
  padding: 11px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: #55686F;
  background: #FFFFFF;
  border-top: 1px solid var(--paper-line);
}

/* ---------- 04 服务与版本 ---------- */
.page-about .about-principles {
  padding-block: clamp(42px, 6vw, 84px);
}
.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-rule {
  padding: 22px 20px 24px;
  background: var(--ink);
}
.page-about .about-rule .num {
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan);
}
.page-about .about-rule h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}
.page-about .about-rule p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--cool);
}
.page-about .about-cadence {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.page-about .about-cadence__item {
  padding-left: 13px;
  border-left: 2px solid var(--cyan);
}
.page-about .about-cadence__item:nth-child(4) {
  border-left-color: var(--amber);
}
.page-about .about-cadence__k {
  margin: 0;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--paper);
}
.page-about .about-cadence__v {
  margin: 4px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cool);
}

/* ---------- 05 浙江运营 ---------- */
.page-about .about-zhejiang {
  padding-block: clamp(42px, 6vw, 84px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 42, 58, .55), rgba(11, 27, 43, 0));
}
.page-about .about-zhejiang__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.page-about .about-zhejiang__fig {
  margin: 0;
  overflow: hidden;
  background: var(--slate);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}
.page-about .about-zhejiang__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05) brightness(.9);
}
.page-about .about-zhejiang__text {
  margin: 16px 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--cool);
}
.page-about .about-contact {
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}
.page-about .about-contact > div {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}
.page-about .about-contact dt {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cool);
}
.page-about .about-contact dd {
  margin: 4px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.page-about .about-contact dd .num {
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--cyan);
}
.page-about .about-zhejiang__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
}
.page-about .about-link {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节索引尾条 ---------- */
.page-about .about-foot {
  padding-block: clamp(28px, 4vw, 44px);
  background: var(--night);
  border-top: 1px solid var(--line);
}
.page-about .about-foot__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 26px;
  align-items: center;
  justify-content: space-between;
}
.page-about .about-foot__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cool);
}
.page-about .about-foot__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-foot__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cool);
  text-decoration: none;
}
.page-about .about-foot__list a .num {
  font-size: 11px;
  color: var(--cyan);
}
.page-about .about-foot__list a:hover,
.page-about .about-foot__list a:focus-visible {
  color: var(--paper);
}
.page-about .about-top {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(21, 224, 200, .45);
  padding: 7px 14px;
}
.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  background: var(--cyan);
  color: var(--night);
}

/* ---------- 阶段筛选（渐进增强） ---------- */
.page-about:has(#phase-foundation:target) .about-track__item:not([data-phase="foundation"]),
.page-about:has(#phase-growth:target) .about-track__item:not([data-phase="growth"]),
.page-about:has(#phase-scale:target) .about-track__item:not([data-phase="scale"]) {
  display: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__numbers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .about-org {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 24px;
  }
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-doors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-sec-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
    align-items: end;
    gap: 28px;
  }
  .page-about .about-sec-head--split .about-sec-head__side {
    margin: 0 0 6px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: end;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .about-zhejiang__grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: center;
  }
  .page-about .about-cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-track__item {
    padding-left: 34px;
  }
  .page-about .about-node {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 218px;
    gap: 26px;
    align-items: start;
    padding: 22px 24px 22px;
  }
  .page-about .about-node__side {
    margin: 2px 0 0;
    border-left-color: var(--line-strong);
  }
  .page-about .about-hero__img {
    aspect-ratio: 4 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-door,
  .page-about .about-chip {
    transition: none;
  }
  .page-about .about-door:hover {
    transform: none;
  }
}