.page-about {
  --tl-pad: 22px;
  --about-rail: 230px;
  color: var(--fg);
}

.page-about .breadcrumbs {
  padding-top: 16px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist-500);
}

.page-about .breadcrumb-list > li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line-strong);
}

.page-about .breadcrumb-link {
  color: var(--mist-500);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan-500);
}

.page-about .breadcrumb-current {
  color: var(--paper-050);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: 14px;
  padding: clamp(26px, 4.6vw, 58px) 0 clamp(30px, 5vw, 60px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 380px at 10% -14%, rgba(31, 182, 201, .16), transparent 62%),
    radial-gradient(720px 340px at 94% -6%, rgba(215, 38, 61, .15), transparent 60%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(107, 122, 143, .1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107, 122, 143, .1) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 80%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 80%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 3vw, 42px);
}

.page-about .about-hero__lead {
  max-width: 46ch;
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(247, 241, 230, .82);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 52px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats__num {
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--gold-400);
  letter-spacing: -.01em;
}

.page-about .about-stats__label {
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist-500);
}

.page-about .about-hero__toc {
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .about-hero__toc-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

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

.page-about .about-hero__toc-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  color: var(--paper-050);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .about-hero__toc-list a:hover,
.page-about .about-hero__toc-list a:focus-visible {
  color: var(--cyan-500);
  transform: translateX(4px);
}

.page-about .about-hero__toc-list .u-mono {
  font-size: 11px;
  color: var(--gold-400);
}

.page-about .about-hero__line {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  width: 100%;
  height: 110px;
  opacity: .85;
  pointer-events: none;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(28px, 4vw, 56px) 0 clamp(48px, 6vw, 86px);
}

.page-about .about-rail__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-rail__nav {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: rgba(15, 31, 51, .6);
}

.page-about .about-rail__nav-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-500);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--paper-050);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__link .u-mono {
  font-size: 10px;
  color: var(--gold-400);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--red-600);
  border-color: var(--red-600);
  color: var(--white);
}

.page-about .about-rail__link:hover .u-mono,
.page-about .about-rail__link:focus-visible .u-mono {
  color: var(--white);
}

.page-about .about-rail__state {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--glass-soft);
}

.page-about .about-rail__state-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist-500);
}

.page-about .about-rail__state-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(247, 241, 230, .82);
}

.page-about .about-rail__state-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.page-about .status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 5px;
  border-radius: 50%;
  background: var(--green-500);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, .16);
}

.page-about .status-dot--warn {
  background: var(--gold-400);
  box-shadow: 0 0 0 3px rgba(224, 165, 38, .16);
}

.page-about .status-dot--idle {
  background: var(--cyan-500);
  box-shadow: 0 0 0 3px rgba(31, 182, 201, .16);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  scroll-margin-top: 92px;
  padding-top: clamp(26px, 3.6vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-section__num {
  font-size: 12px;
  font-weight: 700;
  color: var(--gold-400);
  letter-spacing: .06em;
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.4vw, 31px);
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-section h3 {
  font-family: var(--font-display);
  font-weight: 800;
}

.page-about .about-lead {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 241, 230, .8);
}

.page-about .about-cols {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-cols__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 241, 230, .84);
}

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

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-m);
  background:
    linear-gradient(rgba(107, 122, 143, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107, 122, 143, .12) 1px, transparent 1px),
    var(--ink-700);
  background-size: 28px 28px, 28px 28px, auto;
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .figure--wide .figure__media img {
  aspect-ratio: 7 / 4;
}

.page-about .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--mist-500);
}

.page-about .about-themes__figure,
.page-about .about-team__figure {
  margin: 0 0 22px;
}

/* ---------- 主题簇列表 ---------- */
.page-about .about-themes__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .index-item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .index-item__title {
  margin: 0;
  font-size: 17px;
  color: var(--white);
}

.page-about .index-item__meta {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 241, 230, .74);
}

.page-about .issue-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--r-s);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
}

.page-about .issue-tag--info {
  background: rgba(31, 182, 201, .16);
  color: var(--cyan-500);
  border: 1px solid rgba(31, 182, 201, .35);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 0;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-flow__step {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__num {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  border-radius: var(--r-s);
  background: rgba(224, 165, 38, .14);
  color: var(--gold-400);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 241, 230, .74);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-left: var(--tl-pad);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-400), rgba(224, 165, 38, .18));
}

.page-about .about-stage {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-stage__node {
  position: absolute;
  left: calc(-1 * var(--tl-pad) + 0px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 0 4px rgba(224, 165, 38, .14);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-stage__title {
  margin: 0;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-stage__ver {
  padding: 2px 9px;
  border: 1px solid rgba(224, 165, 38, .45);
  border-radius: var(--r-s);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold-400);
  background: rgba(224, 165, 38, .1);
}

.page-about .about-stage__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 241, 230, .78);
}

.page-about .about-stage:hover .about-stage__node,
.page-about .about-stage:focus-within .about-stage__node {
  transform: scale(1.4);
  box-shadow: 0 0 0 7px rgba(224, 165, 38, .18);
}

.page-about .about-stage:hover .about-stage__title {
  color: var(--gold-400);
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 0;
  margin-bottom: 26px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-scene {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scene__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan-500);
}

.page-about .about-scene__title {
  margin: 0 0 7px;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 241, 230, .76);
}

.page-about .about-promise {
  padding: 22px 20px 18px;
  border-radius: var(--r-m);
}

.page-about .panel--paper {
  background: var(--paper-050);
  color: var(--black);
  border: 1px solid rgba(10, 10, 10, .1);
}

.page-about .about-promise__title {
  margin: 0 0 14px;
  font-size: 18px;
  color: var(--black);
}

.page-about .about-promise__list {
  display: grid;
  gap: 10px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-promise__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(10, 10, 10, .86);
}

.page-about .about-promise__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 2px;
  background: var(--red-600);
}

.page-about .about-promise__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(10, 10, 10, .14);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(10, 10, 10, .6);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  scroll-margin-top: 92px;
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3vw, 34px) clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--red-600);
  border-radius: var(--r-m);
  background:
    linear-gradient(120deg, rgba(215, 38, 61, .13), transparent 58%),
    var(--ink-700);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.8vw, 26px);
  color: var(--white);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 241, 230, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--r-s);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .btn--primary {
  background: var(--red-600);
  color: var(--white);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background: var(--red-500);
}

.page-about .btn--ghost {
  border-color: var(--line-strong);
  color: var(--paper-050);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--cyan-500);
  color: var(--cyan-500);
}

.page-about .btn--mono {
  font-family: var(--font-mono);
  font-size: 13px;
  border-color: rgba(224, 165, 38, .5);
  color: var(--gold-400);
}

.page-about .btn--mono:hover,
.page-about .btn--mono:focus-visible {
  background: rgba(224, 165, 38, .14);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-themes__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
  }

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 26px;
  }

  .page-about .about-scene {
    border-bottom: 0;
    border-top: 2px solid var(--line-strong);
    padding-top: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow__step {
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 18px 22px 4px 0;
  }

  .page-about .about-flow__step:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 292px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about {
    --tl-pad: 28px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 3.6vw, 58px);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 88px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .about-rail__link {
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 10px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(31, 182, 201, .1);
    border-left-color: var(--cyan-500);
    color: var(--cyan-500);
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-about .about-cols__figure {
    margin-top: 4px;
  }

  .page-about .index-item {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 14px;
    padding: 18px 0;
  }

  .page-about .index-item__lead {
    grid-row: span 2;
    padding-top: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__toc-list a,
  .page-about .about-rail__link,
  .page-about .btn,
  .page-about .about-stage__node {
    transition: none;
  }

  .page-about .about-hero__toc-list a:hover,
  .page-about .about-hero__toc-list a:focus-visible,
  .page-about .about-stage:hover .about-stage__node {
    transform: none;
  }
}