.page-about {
  --about-rule: var(--sv-grid-line);
  --about-index-w: 12rem;
  background: var(--sv-deep-void);
  color: var(--sv-text-primary);
}

.page-about :focus-visible {
  outline: 2px solid var(--sv-cyan);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding-block: clamp(1.6rem, 5vw, 3rem) clamp(2.2rem, 6vw, 4rem);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__glow {
  position: absolute;
  z-index: -1;
  top: -45%;
  right: -28%;
  width: 88%;
  height: 175%;
  background: linear-gradient(158deg, rgba(124, 92, 255, 0.30), rgba(53, 224, 212, 0.10) 46%, rgba(5, 7, 14, 0) 72%);
  transform: rotate(-13deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: center;
}

.page-about .about-breadcrumb,
.page-about .sv-breadcrumb {
  margin-bottom: 1.1rem;
}

.page-about .about-hero__title {
  font-family: var(--sv-font-display);
  letter-spacing: 0.10em;
  line-height: 1.06;
  margin: 0.9rem 0 0;
}

.page-about .about-hero__copy .sv-lede {
  margin-top: 1.1rem;
  max-width: 36rem;
}

.page-about .about-hero__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.6rem;
  margin: 1.9rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.page-about .about-stat__num {
  font-family: var(--sv-font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  color: var(--sv-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-stat__label {
  font-size: 0.8125rem;
  color: var(--sv-text-secondary);
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--sv-radius);
  filter: saturate(0.82) contrast(1.05);
}

.page-about .about-hero__cap {
  margin-top: 0.65rem;
  font-family: var(--sv-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--sv-text-secondary);
}

/* ---------- 主体：左索引 / 右内容 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  padding-block: clamp(2.2rem, 5vw, 4rem) clamp(2.4rem, 6vw, 4rem);
}

.page-about .about-index {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  min-width: 0;
}

.page-about .about-index__label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--sv-text-secondary);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: block;
  padding: 0.4rem 0.8rem;
  border-radius: var(--sv-pill);
  border: 1px solid var(--about-rule);
  font-size: 0.8125rem;
  color: var(--sv-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--sv-ease), border-color 0.2s var(--sv-ease), background-color 0.2s var(--sv-ease);
}

.page-about .about-index__link:hover {
  color: var(--sv-text-primary);
  border-color: var(--sv-cyan);
}

.page-about .about-index__cta {
  display: none;
}

.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: clamp(2.6rem, 6vw, 4.5rem);
  min-width: 0;
}

.page-about .about-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-margin-top: 5.5rem;
}

.page-about .about-h2 {
  font-family: var(--sv-font-display);
  letter-spacing: 0.12em;
  line-height: 1.12;
}

.page-about .sv-prose {
  max-width: 38rem;
  margin: 0;
  color: var(--sv-text-secondary);
}

.page-about .about-note {
  margin: 0.6rem 0 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 2px solid var(--sv-cyan);
}

.page-about .about-note p {
  margin: 0;
  max-width: 38rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--sv-text-primary);
}

/* ---------- 图片容器 ---------- */
.page-about .sv-media {
  position: relative;
  display: block;
  margin: 0;
  border-radius: var(--sv-radius);
  overflow: hidden;
  background: var(--sv-cabin-black);
}

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

.page-about .sv-media--21x9 img {
  aspect-ratio: 21 / 9;
}

.page-about .sv-media--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .about-media {
  margin-top: 0.4rem;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0.8rem 0 0;
  padding: 0 0 0 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 2.2rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--sv-cyan), var(--sv-violet) 52%, var(--sv-grid-line));
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-2.2rem + 0.55rem + 1px - 7px);
  top: 0.4rem;
  width: 14px;
  height: 14px;
  border-radius: var(--sv-pill);
  background: var(--sv-deep-void);
  border: 2px solid var(--sv-cyan);
  transition: box-shadow 0.2s var(--sv-ease);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  box-shadow: 0 0 0 5px rgba(53, 224, 212, 0.16);
}

.page-about .about-node__head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.page-about .about-node__era {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--sv-text-secondary);
}

.page-about .about-node__title {
  margin: 0.6rem 0 0.4rem;
}

.page-about .about-node__list {
  list-style: none;
  margin: 0.6rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-about .about-node__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--sv-text-secondary);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.5rem;
  height: 1px;
  background: var(--sv-violet);
}

/* ---------- 流程 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.4rem;
  align-items: center;
}

.page-about .about-split__text {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.page-about .about-flow {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .about-flow__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 0.95rem 1rem;
  background: var(--sv-panel-slate);
  border: 1px solid var(--about-rule);
  border-radius: var(--sv-radius-sm);
}

.page-about .about-flow__step {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--sv-cyan);
}

.page-about .about-flow__name {
  margin: 0;
  font-family: var(--sv-font-head);
  font-size: 1rem;
  font-weight: 600;
}

.page-about .about-flow__owner {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--sv-violet);
}

.page-about .about-flow__desc {
  margin: 0.2rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--sv-text-secondary);
}

/* ---------- 口径 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0.9rem;
  background: var(--sv-cabin-black);
  border-radius: var(--sv-radius-xs);
}

.page-about .about-fact__v {
  font-family: var(--sv-font-mono);
  font-size: 1.3rem;
  color: var(--sv-cyan);
}

.page-about .about-fact__k {
  font-size: 0.75rem;
  color: var(--sv-text-secondary);
}

.page-about .about-accordion {
  margin-top: 0.8rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-acc__item {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-acc__head {
  margin: 0;
  font-size: 1rem;
}

.page-about .about-acc__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 0.2rem;
  background: none;
  border: 0;
  color: var(--sv-text-primary);
  font-family: var(--sv-font-head);
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.page-about .about-acc__mark {
  color: var(--sv-cyan);
  font-size: 1rem;
}

.page-about .about-acc__panel {
  padding: 0 0.2rem 1.1rem;
}

.page-about .about-acc__panel p {
  margin: 0;
  max-width: 38rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--sv-text-secondary);
}

/* ---------- 本地观察 ---------- */
.page-about .about-local {
  margin-top: 0.5rem;
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.1rem;
  border-radius: var(--sv-radius-sm);
  background: var(--sv-panel-slate);
  border: 1px solid var(--about-rule);
}

.page-about .about-card__k {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--sv-cyan);
}

.page-about .about-card__v {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sv-text-primary);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-tabs {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.5rem;
}

.page-about .sv-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .sv-tabs__tab {
  padding: 0.5rem 1rem;
  border-radius: var(--sv-pill);
  border: 1px solid var(--about-rule);
  background: var(--sv-cabin-black);
  color: var(--sv-text-secondary);
  font-family: var(--sv-font-mono);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: color 0.2s var(--sv-ease), background-color 0.2s var(--sv-ease), border-color 0.2s var(--sv-ease);
}

.page-about .sv-tabs__tab[aria-selected="true"] {
  background: var(--sv-cyan);
  border-color: var(--sv-cyan);
  color: var(--sv-deep-void);
}

.page-about .sv-tabs__panel {
  padding: 1.1rem;
  border-radius: var(--sv-radius-sm);
  background: var(--sv-panel-slate);
  border: 1px solid var(--about-rule);
}

.page-about .sv-tabs__panel p {
  margin: 0;
  max-width: 40rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--sv-text-secondary);
}

.page-about .about-eco__title {
  margin: 1.4rem 0 0;
}

.page-about .about-eco {
  list-style: none;
  margin: 0.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-eco li {
  display: grid;
  gap: 0.15rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sv-text-secondary);
}

.page-about .about-eco strong {
  color: var(--sv-text-primary);
  font-weight: 600;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: clamp(2.6rem, 7vw, 4.5rem);
  padding: clamp(1.4rem, 4vw, 2.2rem);
  border-radius: var(--sv-radius);
  border: 1px solid var(--about-rule);
  background: linear-gradient(140deg, var(--sv-panel-slate), var(--sv-cabin-black));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--sv-font-display);
  letter-spacing: 0.12em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-eco li {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 1rem;
  }
}

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.7rem;
  }

  .page-about .about-flow__item::after {
    content: "";
    position: absolute;
    right: -0.55rem;
    top: 2.6rem;
    width: 0.8rem;
    height: 1px;
    background: var(--sv-grid-line);
    transform: rotate(-20deg);
  }

  .page-about .about-flow__item:last-child::after {
    display: none;
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: end;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 3 / 4;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
  }

  .page-about .about-index {
    position: sticky;
    top: 5.5rem;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    padding: 0.4rem 0 0.4rem 0.75rem;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--sv-cyan);
    background: none;
  }

  .page-about .about-index__cta {
    display: inline-flex;
    justify-content: center;
    margin-top: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}