.page-about {
  background: var(--void);
  color: var(--ink);
  overflow-x: clip;
  --about-glow: color-mix(in srgb, var(--blue) 34%, transparent);
  --about-soft: color-mix(in srgb, var(--blue) 14%, transparent);
  --about-cyansoft: color-mix(in srgb, var(--cyan) 20%, transparent);
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding: 20px 0 4px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mute);
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumbs a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 5vw, 60px) 0 clamp(40px, 6vw, 76px);
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.3;
  filter: saturate(0.75) contrast(1.05);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(110% 80% at 10% 0%, var(--about-glow), transparent 62%),
    linear-gradient(180deg, rgba(7, 11, 20, 0.5) 0%, rgba(7, 11, 20, 0.9) 58%, var(--void) 100%);
}
.page-about .about-hero__inner {
  position: relative;
}
.page-about .about-hero__title {
  margin: 10px 0 18px;
  max-width: 15em;
  font-size: clamp(30px, 5.6vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
}
.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 4vw, 40px);
  max-width: 42em;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--panel) 80%, transparent);
  backdrop-filter: blur(6px);
}
.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan);
}
.page-about .about-hero__facts li:nth-child(2) .about-num {
  color: var(--ink);
}
.page-about .about-hero__facts li:nth-child(3) .about-num {
  color: var(--orange);
}
.page-about .about-fact-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mute);
}

/* 主体两栏 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(48px, 8vw, 100px);
}

/* 章节索引 */
.page-about .about-index {
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-index::-webkit-scrollbar {
  display: none;
}
.page-about .about-index__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mute);
  text-transform: uppercase;
}
.page-about .about-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--mute);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  background: var(--about-soft);
  border-color: color-mix(in srgb, var(--blue) 50%, transparent);
}
.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

/* 正文节奏 */
.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(56px, 8vw, 108px);
}
.page-about .about-chapter {
  scroll-margin-top: 96px;
}
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}
.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.06em;
  background: var(--edge);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.page-about .about-chapter__lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 36em;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
}

/* 01 小组卡片 */
.page-about .about-crews {
  display: grid;
  gap: 14px;
}
.page-about .about-crew {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.page-about .about-crew::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--edge);
  opacity: 0.85;
}
.page-about .about-crew:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--blue) 45%, var(--line));
}
.page-about .about-crew h3 {
  margin: 0 0 10px;
  font-size: 17.5px;
  letter-spacing: -0.01em;
}
.page-about .about-crew p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}
.page-about .about-crew a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--cyan) 45%, transparent);
}
.page-about .about-crew a:hover,
.page-about .about-crew a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}
.page-about .about-crew__meta {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

/* 02 流程 */
.page-about .about-flow {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 38px);
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-about .about-flow__item {
  position: relative;
  padding-left: 54px;
}
.page-about .about-flow__dot {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--void);
  background: linear-gradient(135deg, var(--cyan), var(--blue));
}
.page-about .about-flow__body h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
}
.page-about .about-flow__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}

/* 图片容器 */
.page-about .about-figure {
  margin: 0;
}
.page-about .about-media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, color-mix(in srgb, var(--blue) 24%, transparent), color-mix(in srgb, var(--violet) 22%, transparent));
}
.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}
.page-about .about-figure--offset {
  margin-top: clamp(24px, 4vw, 40px);
}

/* 03 更新节奏 */
.page-about .about-rhythm {
  display: grid;
  gap: 14px;
}
.page-about .about-rhythm__main {
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, color-mix(in srgb, var(--blue) 20%, var(--panel)), var(--panel) 72%);
  border: 1px solid var(--line);
}
.page-about .about-rhythm__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .about-rhythm__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-rhythm__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-rhythm__list li {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}
.page-about .about-stat {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  margin-bottom: 10px;
}
.page-about .about-stat-unit {
  font-size: 0.5em;
  margin-left: 2px;
}
.page-about .about-stat-label {
  display: block;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mute);
}

/* 04 时间线 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 28px;
  display: grid;
  gap: 16px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--cyan) 48%, var(--violet));
  opacity: 0.6;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--about-cyansoft);
}
.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  transform: translateX(4px);
  border-color: color-mix(in srgb, var(--cyan) 50%, var(--line));
  background: color-mix(in srgb, var(--blue) 12%, var(--panel));
}
.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 6px;
}
.page-about .about-timeline__item h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
}
.page-about .about-timeline__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}
.page-about .about-timeline__item a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--cyan) 45%, transparent);
}
.page-about .about-timeline__item a:hover,
.page-about .about-timeline__item a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* 05 合作 */
.page-about .about-partners {
  display: grid;
  gap: 14px;
}
.page-about .about-partner {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}
.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--cyan);
  margin-bottom: 12px;
}
.page-about .about-partner:nth-child(2) .about-partner__num {
  color: var(--violet);
}
.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-size: 17.5px;
}
.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* 06 承诺 */
.page-about .about-promises {
  display: grid;
  gap: 14px;
}
.page-about .about-promise {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, color-mix(in srgb, var(--blue) 15%, var(--panel)), var(--panel) 74%);
}
.page-about .about-promise__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  margin-bottom: 12px;
}
.page-about .about-promise__unit {
  font-size: 0.42em;
  margin-left: 3px;
  color: var(--mute);
}
.page-about .about-promise h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
}
.page-about .about-promise p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mute);
}

/* 收尾 CTA */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: clamp(30px, 5vw, 48px);
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, color-mix(in srgb, var(--blue) 24%, transparent), color-mix(in srgb, var(--violet) 18%, transparent));
}
.page-about .about-cta__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板 */
@media (min-width: 720px) {
  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-promises {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partners {
    grid-template-columns: 1.08fr 1fr;
  }
  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 28px 30px;
  }
}

/* 宽屏：索引固定 + 流程横向 */
@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 96px;
    overflow: visible;
    padding: 0 0 0 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
  }
  .page-about .about-index__list a {
    border-color: transparent;
  }
  .page-about .about-crews {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    position: relative;
    padding-top: 4px;
  }
  .page-about .about-flow::before {
    content: "";
    position: absolute;
    left: 6%;
    right: 6%;
    top: 23px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--blue), var(--cyan) 55%, var(--violet));
    opacity: 0.5;
  }
  .page-about .about-flow__item {
    padding: 0 18px 0 0;
  }
  .page-about .about-flow__item::before {
    content: "";
    position: absolute;
    inset: 0 18px 0 0;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, var(--about-soft), transparent 60%);
    opacity: 0;
    transition: opacity 0.25s ease;
  }
  .page-about .about-flow__item:hover::before,
  .page-about .about-flow__item:focus-within::before {
    opacity: 1;
  }
  .page-about .about-flow__dot {
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 6px var(--void);
  }
  .page-about .about-flow__body {
    position: relative;
    z-index: 1;
    padding-right: 6px;
  }
  .page-about .about-rhythm {
    grid-template-columns: 1.15fr 1fr;
    align-items: start;
  }
  .page-about .about-figure--offset {
    margin-left: 8%;
  }
}

@media (min-width: 1280px) {
  .page-about .about-figure--offset {
    margin-left: 16%;
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew,
  .page-about .about-timeline__item,
  .page-about .about-index__list a {
    transition: none;
  }
  .page-about .about-crew:hover,
  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-within {
    transform: none;
  }
}
</main>