.page-about {
  --about-rail: 104px;
  position: relative;
  color: var(--c7-white);
  background:
    radial-gradient(880px 460px at 8% 2%, rgba(43, 231, 220, .12), transparent 68%),
    radial-gradient(720px 420px at 96% 20%, rgba(108, 92, 231, .16), transparent 70%),
    var(--c7-ink);
  overflow-x: clip;
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(233, 239, 250, .03) 0 1px, transparent 1px 4px);
  z-index: 0;
}

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

.page-about .about-crumbs {
  padding-block: clamp(14px, 3vw, 26px) clamp(6px, 1.5vw, 12px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  padding-block: clamp(8px, 2vw, 20px) clamp(28px, 5vw, 56px);
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--c7-white);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: rgba(233, 239, 250, .82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 24px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--c7-line);
  list-style: none;
  font-size: 13px;
  color: var(--c7-muted);
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .about-hero__facts .c7-mono {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c7-cyan);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  margin: 0;
}

.page-about .about-frame {
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
  padding: 8px;
  background: linear-gradient(150deg, rgba(43, 231, 220, .28), rgba(108, 92, 231, .2) 60%, rgba(255, 122, 47, .18));
}

.page-about .about-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-cap {
  margin: 10px 0 0;
  font-family: var(--c7-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--c7-muted);
  text-align: right;
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: clamp(18px, 3vw, 34px);
  border-bottom: 1px solid var(--c7-line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--c7-muted);
  border: 1px solid var(--c7-line);
  border-radius: var(--c7-radius);
  transition: color .25s var(--c7-ease), border-color .25s var(--c7-ease), background-color .25s var(--c7-ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--c7-white);
  border-color: var(--c7-orange);
  background: rgba(255, 122, 47, .1);
}

.page-about .about-toc__num {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c7-cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  display: grid;
}

.page-about .about-chapter {
  display: grid;
  gap: 10px;
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--c7-line);
  scroll-margin-top: 96px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(10px, 2vw, 18px);
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

@media (min-width: 900px) {
  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

.page-about .about-chapter__num {
  font-family: var(--c7-mono);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .08em;
  color: var(--c7-cyan);
  opacity: .72;
}

.page-about .about-chapter__rule {
  flex: 1;
  height: 1px;
  min-width: 48px;
  background: linear-gradient(90deg, var(--c7-line-strong), transparent);
}

@media (min-width: 900px) {
  .page-about .about-chapter__rule {
    flex: none;
    width: 1px;
    min-width: 0;
    height: 64px;
    background: linear-gradient(180deg, var(--c7-line-strong), transparent);
  }
}

.page-about .about-chapter__title {
  margin: 0 0 8px;
  font-size: clamp(22px, 3.2vw, 31px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: .01em;
  color: var(--c7-white);
}

.page-about .about-chapter .c7-lede {
  margin: 0 0 18px;
  max-width: 44ch;
  font-family: var(--c7-serif);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
  color: rgba(233, 239, 250, .9);
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(233, 239, 250, .78);
}

.page-about .about-verdict {
  margin: 22px 0 0;
  max-width: 62ch;
  padding: 14px 18px;
  border-left: 3px solid var(--c7-wine);
  background: linear-gradient(90deg, rgba(122, 31, 61, .35), rgba(122, 31, 61, 0));
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 700;
  line-height: 1.7;
  color: var(--c7-white);
}

/* ---------- 标签组 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-chips li {
  padding: 6px 12px;
  font-family: var(--c7-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c7-muted);
  background: rgba(18, 29, 51, .85);
  border: 1px solid var(--c7-line);
  border-radius: var(--c7-radius);
}

/* ---------- 工作日时间线 ---------- */
.page-about .about-flow {
  margin: 6px 0 20px;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--c7-line-strong);
}

.page-about .about-flow__item {
  position: relative;
  padding: 0 0 24px 24px;
}

.page-about .about-flow__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c7-yellow);
  box-shadow: 0 0 0 3px rgba(255, 200, 87, .14);
}

.page-about .about-flow__time {
  display: block;
  font-family: var(--c7-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--c7-yellow);
}

.page-about .about-flow__title {
  display: block;
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c7-white);
}

.page-about .about-flow__item p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 239, 250, .74);
}

/* ---------- 插图 ---------- */
.page-about .about-figure {
  margin: 20px 0 22px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c7-line);
  background: var(--c7-panel);
}

@media (min-width: 900px) {
  .page-about .about-figure--square {
    max-width: 420px;
  }
}

/* ---------- 版本阶段 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .about-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-stage {
  position: relative;
  padding: 20px 18px 18px;
  border: 1px solid var(--c7-line);
  background: linear-gradient(158deg, rgba(18, 29, 51, .96), rgba(10, 16, 32, .96));
  transition: border-color .28s var(--c7-ease), transform .28s var(--c7-ease);
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 2px;
  opacity: .5;
  background: linear-gradient(90deg, var(--c7-cyan), rgba(108, 92, 231, 0));
  transition: opacity .28s var(--c7-ease), background .28s var(--c7-ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  border-color: var(--c7-orange);
  transform: translateY(-2px);
}

.page-about .about-stage:hover::after,
.page-about .about-stage:focus-within::after {
  opacity: 1;
  background: linear-gradient(90deg, var(--c7-orange), rgba(255, 200, 87, 0));
}

.page-about .about-stage__tag {
  display: inline-block;
  font-family: var(--c7-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c7-cyan);
}

.page-about .about-stage__title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c7-white);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(233, 239, 250, .72);
}

.page-about .about-stage__fix {
  margin: 12px 0 0;
  padding-top: 11px;
  border-top: 1px dashed rgba(43, 231, 220, .24);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c7-muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team__item {
  position: relative;
  padding: 24px 18px 18px;
  background: var(--c7-panel);
  border: 1px solid var(--c7-line);
}

.page-about .about-team__item[data-tone="cyan"] { --tone: var(--c7-cyan); }
.page-about .about-team__item[data-tone="orange"] { --tone: var(--c7-orange); }
.page-about .about-team__item[data-tone="violet"] { --tone: var(--c7-violet); }
.page-about .about-team__item[data-tone="yellow"] { --tone: var(--c7-yellow); }

.page-about .about-team__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--tone, var(--c7-cyan));
}

.page-about .about-team__count {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--c7-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c7-white);
  background: rgba(43, 231, 220, .12);
  border-radius: var(--c7-radius);
}

.page-about .about-team__title {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c7-white);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(233, 239, 250, .74);
}

/* ---------- 信息清单 ---------- */
.page-about .about-facts {
  margin: 20px 0 20px;
  padding: 0;
  border-top: 1px solid var(--c7-line);
}

.page-about .about-facts__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c7-line);
}

@media (min-width: 640px) {
  .page-about .about-facts__row {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 16px;
    align-items: baseline;
  }
}

.page-about .about-facts__row dt {
  font-family: var(--c7-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c7-cyan);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(233, 239, 250, .82);
  word-break: break-word;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(34px, 5vw, 58px);
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--c7-line-strong);
  background:
    radial-gradient(520px 240px at 90% 0%, rgba(255, 122, 47, .18), transparent 70%),
    linear-gradient(150deg, rgba(18, 29, 51, .97), rgba(10, 16, 32, .97));
}

@media (min-width: 880px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: clamp(24px, 4vw, 48px);
  }
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--c7-white);
}

.page-about .about-cta__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 239, 250, .76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-stage::after,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-stage:focus-within {
    transform: none;
  }
}