.page-about {
  --about-rail-w: 236px;
  --about-orange-deep: #C2551A;
  --about-line: rgba(143, 166, 184, 0.22);
  background: var(--abg-navy);
  color: var(--abg-paper);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 40px);
  font-size: 13px;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb__list > li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--abg-mist);
}
.page-about .breadcrumb__link {
  color: var(--abg-mist);
  text-decoration: none;
}
.page-about .breadcrumb__link:hover {
  color: var(--abg-cyan);
}
.page-about .breadcrumb__current {
  color: var(--abg-paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(32px, 5vw, 68px);
  overflow: hidden;
  background:
    radial-gradient(85% 70% at 90% -10%, rgba(45, 226, 255, 0.16), transparent 62%),
    radial-gradient(70% 60% at 0% 110%, rgba(255, 139, 61, 0.13), transparent 66%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(143, 166, 184, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 166, 184, 0.12) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(80% 70% at 55% 8%, #000 0%, transparent 76%);
  mask-image: radial-gradient(80% 70% at 55% 8%, #000 0%, transparent 76%);
}
.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}
.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--abg-paper);
}
.page-about .about-hero__lede {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.82);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-hero__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}
.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 16px 14px;
  background: var(--abg-navy-2);
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--abg-cyan);
}
.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--abg-mist);
}
.page-about .about-hero__figure {
  margin: 0;
  background: var(--abg-graphite);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

/* ---------- 分屏主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}
.page-about .about-rail {
  min-width: 0;
  border-top: 2px solid var(--abg-cyan);
  padding-top: 14px;
}
.page-about .about-rail__note {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--abg-cyan);
}
.page-about .anchor-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .anchor-nav__list::-webkit-scrollbar {
  display: none;
}
.page-about .anchor-nav__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 10px;
  font-size: 13.5px;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(243, 235, 221, 0.72);
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .anchor-nav__link:hover {
  color: var(--abg-cyan);
  border-left-color: var(--abg-cyan);
  background: rgba(45, 226, 255, 0.07);
}
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--abg-orange);
}
.page-about .about-rail__mark {
  display: none;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--abg-mist);
  writing-mode: vertical-rl;
}

/* ---------- 章节 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 5.5vw, 78px);
  min-width: 0;
}
.page-about .about-chapter {
  min-width: 0;
  scroll-margin-top: 110px;
}
.page-about .about-chapter__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 0.9;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: rgba(45, 226, 255, 0.92);
}
.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--abg-paper);
}
.page-about .about-chapter__lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.8);
}
.page-about .about-chapter__close {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--abg-orange);
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.82);
}

/* ---------- 01 场景 ---------- */
.page-about .about-scene {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-scene__item {
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--abg-navy);
}
.page-about .about-scene__item h3 {
  margin: 0 0 9px;
  font-size: 15.5px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--abg-cyan);
}
.page-about .about-scene__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.74);
}

/* ---------- 02 双核心 ---------- */
.page-about .about-dual {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-dual__col {
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--abg-navy-2);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.page-about .about-dual__col--two {
  background: linear-gradient(158deg, var(--abg-navy-2) 20%, var(--abg-graphite) 100%);
}
.page-about .about-dual__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--abg-orange);
}
.page-about .about-dual__col h3 {
  margin: 10px 0 16px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--abg-paper);
}
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 17px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.78);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--abg-cyan);
  transform: rotate(45deg);
}
.page-about .about-list strong {
  color: var(--abg-paper);
  font-weight: 700;
}

/* ---------- 3 / 4 奶油纸白 ---------- */
.page-about .about-chapter--paper {
  background: var(--abg-paper);
  color: var(--abg-ink);
  padding: clamp(20px, 3.4vw, 44px);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}
.page-about .about-chapter--paper .about-chapter__title {
  color: var(--abg-ink);
}
.page-about .about-chapter--paper .chapter-num {
  color: var(--about-orange-deep);
}
.page-about .about-chapter--paper .about-chapter__lede {
  color: rgba(27, 20, 17, 0.74);
}
.page-about .about-chapter--paper .about-chapter__close {
  border-left-color: var(--about-orange-deep);
  color: rgba(27, 20, 17, 0.78);
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(18px, 2.5vw, 28px);
}
.page-about .filter-btn {
  appearance: none;
  cursor: pointer;
  padding: 7px 14px;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.4;
  color: var(--abg-ink);
  background: transparent;
  border: 1px solid rgba(27, 20, 17, 0.28);
  border-radius: 999px;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.page-about .filter-btn:hover {
  border-color: var(--abg-ink);
}
.page-about .filter-btn[aria-pressed="true"],
.page-about .filter-btn.is-active {
  background: var(--abg-ink);
  border-color: var(--abg-ink);
  color: var(--abg-paper);
}

.page-about .about-timeline-figure {
  margin: clamp(18px, 2.5vw, 28px) 0 0;
  background: var(--abg-navy);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--abg-orange), var(--about-orange-deep) 55%, rgba(27, 20, 17, 0.25));
}
.page-about .about-step {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px) 34px;
}
.page-about .about-step:last-child {
  padding-bottom: 0;
}
.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--abg-paper);
  border: 3px solid var(--about-orange-deep);
}
.page-about .about-step[hidden],
.page-about .about-step.is-hidden {
  display: none;
}
.page-about .about-step__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--about-orange-deep);
}
.page-about .about-step h3 {
  margin: 7px 0 8px;
  font-size: 17px;
  line-height: 1.42;
  color: var(--abg-ink);
}
.page-about .about-step p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(27, 20, 17, 0.76);
}

/* ---------- 04 团队 ---------- */
.page-about .about-roles {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid rgba(27, 20, 17, 0.16);
}
.page-about .about-role {
  border-bottom: 1px solid rgba(27, 20, 17, 0.16);
}
.page-about .about-role > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-role > summary::-webkit-details-marker {
  display: none;
}
.page-about .about-role > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--about-orange-deep);
}
.page-about .about-role[open] > summary::after {
  content: "−";
}
.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(27, 20, 17, 0.42);
}
.page-about .about-role__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--abg-ink);
}
.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--about-orange-deep);
}
.page-about .about-role__body {
  margin: 0;
  padding: 0 2px 18px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(27, 20, 17, 0.76);
}

/* ---------- 05 覆盖与伙伴 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-reach__stats {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}
.page-about .about-reach__row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  background: var(--abg-navy-2);
  border-left: 3px solid var(--abg-cyan);
}
.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--abg-cyan);
  flex: none;
}
.page-about .about-reach__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(243, 235, 221, 0.8);
}
.page-about .about-reach__figure {
  margin: 0;
  background: var(--abg-graphite);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.page-about .about-ways {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-way {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--abg-navy);
}
.page-about .about-way h3 {
  margin: 0 0 9px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--abg-orange);
}
.page-about .about-way p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.76);
}

/* ---------- 06 纠错 ---------- */
.page-about .about-care {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-care__main {
  min-width: 0;
}
.page-about .about-care__main p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(243, 235, 221, 0.82);
}
.page-about .about-cycle {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .about-cycle li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(243, 235, 221, 0.78);
}
.page-about .about-cycle .mono {
  flex: none;
  min-width: 118px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--abg-cyan);
}
.page-about .about-care__contact {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--abg-graphite);
  border-top: 2px solid var(--abg-orange);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}
.page-about .about-care__contact .mono {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--abg-mist);
}
.page-about .about-care__contact a {
  display: inline-block;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.8vw, 16px);
  color: var(--abg-cyan);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid rgba(45, 226, 255, 0.4);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-care__contact a:hover {
  color: var(--abg-paper);
  border-bottom-color: var(--abg-paper);
}
.page-about .about-care__contact p:last-child {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--abg-mist);
}
.page-about .about-endlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--about-line);
}

/* ---------- 显现兜底 ---------- */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-ways {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-scene {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }
  .page-about .about-care {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }
  .page-about .about-rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }
  .page-about .anchor-nav__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about .anchor-nav__link {
    border-left: 2px solid rgba(143, 166, 184, 0.18);
  }
  .page-about .about-rail__mark {
    display: block;
  }
}

@media (min-width: 1060px) {
  .page-about .about-ways {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .filter-btn,
  .page-about .anchor-nav__link,
  .page-about .about-care__contact a {
    transition: none;
  }
}