.page-about {
  --about-line: rgba(63, 224, 208, .3);
  --about-soft: rgba(63, 224, 208, .08);
  --about-gold-soft: rgba(242, 180, 65, .12);
  position: relative;
  color: var(--sf-mist);
}

/* ---------- 面包屑补充 ---------- */
.page-about .about-crumb-here {
  color: var(--sf-gray);
  font-size: 13px;
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  position: relative;
  padding: clamp(26px, 4.5vw, 58px) 0 clamp(34px, 6vw, 74px);
  overflow: hidden;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -14%;
  width: min(720px, 108vw);
  height: min(720px, 108vw);
  background:
    radial-gradient(circle at 50% 50%, rgba(63, 224, 208, .16), transparent 64%),
    radial-gradient(circle at 32% 68%, rgba(242, 180, 65, .09), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-intro__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-intro__main h1 {
  font-family: var(--sf-font-display);
  font-size: clamp(29px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 14px 0 20px;
  max-width: 19ch;
  color: var(--sf-mist);
}

.page-about .about-intro__main .sf-lede {
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--sf-mist);
  opacity: .88;
  margin: 0;
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 收藏按钮 ---------- */
.page-about .about-save {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid rgba(63, 224, 208, .38);
  background: var(--about-soft);
  color: var(--sf-neon-200);
  font-family: var(--sf-font-body);
  font-size: 14.5px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s var(--sf-ease), border-color .2s var(--sf-ease);
}

.page-about .about-save:hover {
  background: rgba(63, 224, 208, .16);
  border-color: var(--sf-neon-400);
}

.page-about .about-save__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sf-neon-400);
  box-shadow: 0 0 10px rgba(63, 224, 208, .7);
  transition: background .2s var(--sf-ease), box-shadow .2s var(--sf-ease);
}

.page-about .about-save[aria-pressed="true"] {
  border-color: var(--sf-gold-500);
  background: var(--about-gold-soft);
  color: var(--sf-gold-300);
}

.page-about .about-save[aria-pressed="true"] .about-save__dot {
  background: var(--sf-gold-500);
  box-shadow: 0 0 10px rgba(242, 180, 65, .72);
}

/* ---------- 首屏数字面板 ---------- */
.page-about .about-intro__aside {
  border: 1px solid rgba(28, 70, 119, .95);
  border-radius: var(--sf-radius-l);
  background: linear-gradient(158deg, rgba(18, 48, 90, .88), rgba(11, 33, 64, .58));
  padding: 22px;
}

.page-about .about-intro__asideTitle {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sf-gray);
}

.page-about .about-stats {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-stats > div {
  border-left: 2px solid var(--about-line);
  padding-left: 12px;
  min-width: 0;
}

.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sf-gray);
}

.page-about .about-stats dd {
  margin: 6px 0 0;
  font-family: var(--sf-font-mono);
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 700;
  color: var(--sf-gold-300);
  letter-spacing: .01em;
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(22px, 3.2vw, 38px);
}

.page-about .about-head h2 {
  font-family: var(--sf-font-display);
  font-size: clamp(24px, 3.6vw, 35px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.015em;
  margin: 10px 0 12px;
  color: var(--sf-mist);
}

.page-about .about-head__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sf-gray);
}

/* ---------- 图片通用 ---------- */
.page-about .sf-media {
  margin: 0;
  border-radius: var(--sf-radius-m);
  overflow: hidden;
  border: 1px solid rgba(28, 70, 119, .8);
  background: var(--sf-deep-800);
}

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

.page-about .sf-media__caption {
  display: block;
  padding: 12px 16px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--sf-gray);
  background: rgba(11, 33, 64, .7);
}

/* ---------- 发展轨迹时间线 ---------- */
.page-about .about-milestones__figure {
  margin-bottom: clamp(30px, 5vw, 56px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
      rgba(63, 224, 208, .75) 0%,
      rgba(28, 70, 119, .95) 38%,
      rgba(28, 70, 119, .95) 72%,
      rgba(242, 180, 65, .6) 100%);
}

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

.page-about .about-timeline__item + .about-timeline__item {
  border-top: 1px solid rgba(28, 70, 119, .5);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 32px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sf-deep-900);
  border: 2px solid var(--sf-neon-400);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, .08), 0 0 14px rgba(63, 224, 208, .38);
}

.page-about .about-timeline__item:nth-child(5)::before {
  border-color: var(--sf-gold-500);
  box-shadow: 0 0 0 4px rgba(242, 180, 65, .1), 0 0 14px rgba(242, 180, 65, .38);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--sf-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--sf-neon-400);
  margin-bottom: 8px;
}

.page-about .about-timeline__item:nth-child(5) .about-timeline__year {
  color: var(--sf-gold-300);
}

.page-about .about-timeline__title {
  font-family: var(--sf-font-display);
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
  margin: 0 0 10px;
  color: var(--sf-mist);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sf-gray);
}

/* ---------- 四支小组 ---------- */
.page-about .about-teams__layout {
  display: grid;
  gap: 26px;
}

.page-about .about-teams__grid {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .about-team {
  position: relative;
  padding: 24px 22px 20px;
  border: 1px solid rgba(28, 70, 119, .9);
  background: linear-gradient(152deg, rgba(18, 48, 90, .74), rgba(11, 33, 64, .5));
  overflow: hidden;
  min-width: 0;
  transition: transform .28s var(--sf-ease), border-color .28s var(--sf-ease);
}

.page-about .about-team:nth-child(1) { border-radius: 28px 20px 24px 20px; }
.page-about .about-team:nth-child(2) { border-radius: 20px 28px 20px 24px; }
.page-about .about-team:nth-child(3) { border-radius: 24px 20px 28px 20px; }
.page-about .about-team:nth-child(4) { border-radius: 20px 24px 20px 28px; }

.page-about .about-team::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--sf-neon-400);
  transition: width .3s var(--sf-ease);
}

.page-about .about-team--rules::after { background: var(--sf-gold-500); }
.page-about .about-team--support::after { background: var(--sf-neon-200); }
.page-about .about-team--tech::after { background: rgba(147, 169, 192, .9); }

.page-about .about-team:hover {
  transform: translateY(-3px);
  border-color: rgba(63, 224, 208, .4);
}

.page-about .about-team:hover::after {
  width: 100%;
}

.page-about .about-team__no {
  display: inline-block;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sf-gray);
}

.page-about .about-team__name {
  font-family: var(--sf-font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  margin: 8px 0 10px;
  color: var(--sf-mist);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sf-gray);
}

.page-about .about-team__more {
  margin-top: 12px;
  border-top: 1px dashed rgba(28, 70, 119, .9);
  padding-top: 10px;
}

.page-about .about-team__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sf-neon-200);
  padding: 4px 0;
  transition: color .2s var(--sf-ease);
}

.page-about .about-team__more summary:hover {
  color: var(--sf-neon-400);
}

.page-about .about-team__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  font-family: var(--sf-font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--sf-neon-400);
  transition: transform .24s var(--sf-ease);
}

.page-about .about-team__more[open] summary::before {
  transform: rotate(45deg);
}

.page-about .about-team__more ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-team__more li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--sf-gray);
}

.page-about .about-team__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--about-line);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  position: relative;
}

.page-about .about-rhythm::before {
  content: "";
  position: absolute;
  inset: 12% auto auto -8%;
  width: min(520px, 70vw);
  height: min(520px, 70vw);
  background: radial-gradient(circle, rgba(242, 180, 65, .08), transparent 68%);
  pointer-events: none;
}

.page-about .about-rhythm__figure {
  position: relative;
  margin: 0 0 clamp(24px, 3.6vw, 40px);
}

.page-about .about-rhythm__grid {
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .about-rhythm__item {
  position: relative;
  padding: 22px;
  border: 1px solid rgba(28, 70, 119, .85);
  border-radius: var(--sf-radius-m);
  background: rgba(11, 33, 64, .55);
  min-width: 0;
}

.page-about .about-rhythm__item::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(242, 180, 65, .7), transparent);
}

.page-about .about-rhythm__cycle {
  display: inline-block;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--about-gold-soft);
  color: var(--sf-gold-300);
}

.page-about .about-rhythm__title {
  font-family: var(--sf-font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  margin: 14px 0 10px;
  color: var(--sf-mist);
}

.page-about .about-rhythm__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--sf-gray);
}

/* ---------- 陪伴的做法 ---------- */
.page-about .about-companion__panel {
  position: relative;
  border-radius: var(--sf-radius-l);
  border: 1px solid rgba(63, 224, 208, .2);
  background: var(--sf-grad-deep);
  padding: clamp(24px, 4vw, 50px);
  overflow: hidden;
}

.page-about .about-companion__panel::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(520px, 80vw);
  height: min(520px, 80vw);
  background: radial-gradient(circle, rgba(63, 224, 208, .14), transparent 66%);
  pointer-events: none;
}

.page-about .about-companion__lead {
  position: relative;
  z-index: 1;
  max-width: 62ch;
}

.page-about .about-companion__lead h2 {
  font-family: var(--sf-font-display);
  font-size: clamp(23px, 3.4vw, 33px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.015em;
  margin: 10px 0 14px;
  color: var(--sf-mist);
}

.page-about .about-companion__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.88;
  color: var(--sf-mist);
  opacity: .86;
}

.page-about .about-companion__facts {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-companion__facts li {
  border-left: 2px solid var(--about-line);
  padding-left: 16px;
  min-width: 0;
}

.page-about .about-companion__num {
  display: block;
  font-family: var(--sf-font-mono);
  font-size: clamp(21px, 3vw, 27px);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--sf-neon-200);
}

.page-about .about-companion__label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sf-gray);
}

/* ---------- 一起做事 ---------- */
.page-about .about-together__panel {
  display: grid;
  gap: 24px;
  border-radius: var(--sf-radius-l);
  border: 1px solid rgba(242, 180, 65, .3);
  background: linear-gradient(152deg, rgba(18, 48, 90, .92), rgba(6, 20, 40, .96));
  padding: clamp(24px, 4vw, 46px);
}

.page-about .about-together__text h2 {
  font-family: var(--sf-font-display);
  font-size: clamp(23px, 3.4vw, 33px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.015em;
  margin: 10px 0 16px;
  color: var(--sf-mist);
}

.page-about .about-together__text-p {
  margin: 0 0 12px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--sf-gray);
}

.page-about .about-together__text-p a {
  color: var(--sf-neon-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 247, 239, .4);
  transition: color .2s var(--sf-ease), border-color .2s var(--sf-ease);
}

.page-about .about-together__text-p a:hover {
  color: var(--sf-neon-400);
  border-color: var(--sf-neon-400);
}

.page-about .about-together__action {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}

.page-about .about-together__note {
  margin: 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--sf-gray);
}

/* ---------- 错峰进入 ---------- */
@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .about-team,
.page-about .about-rhythm__item,
.page-about .about-timeline__item {
  animation: about-rise .52s var(--sf-ease) both;
}

.page-about .about-timeline__item:nth-child(1) { animation-delay: .04s; }
.page-about .about-timeline__item:nth-child(2) { animation-delay: .08s; }
.page-about .about-timeline__item:nth-child(3) { animation-delay: .12s; }
.page-about .about-timeline__item:nth-child(4) { animation-delay: .16s; }
.page-about .about-timeline__item:nth-child(5) { animation-delay: .2s; }

.page-about .about-team:nth-child(1) { animation-delay: .04s; }
.page-about .about-team:nth-child(2) { animation-delay: .08s; }
.page-about .about-team:nth-child(3) { animation-delay: .12s; }
.page-about .about-team:nth-child(4) { animation-delay: .16s; }

.page-about .about-rhythm__item:nth-child(1) { animation-delay: .04s; }
.page-about .about-rhythm__item:nth-child(2) { animation-delay: .08s; }
.page-about .about-rhythm__item:nth-child(3) { animation-delay: .12s; }

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

  .page-about .about-companion__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-together__action {
    align-items: flex-start;
  }
}

@media (min-width: 780px) {
  .page-about .about-rhythm__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .about-timeline__item::before {
    left: -33px;
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .82fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-together__panel {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .7fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-together__action {
    align-items: flex-end;
    text-align: right;
  }
}

@media (min-width: 1000px) {
  .page-about .about-teams__layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-teams__figure {
    position: sticky;
    top: 118px;
  }

  .page-about .about-companion__panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-companion__facts {
    margin-top: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .about-companion__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-intro__main h1 {
    max-width: 18ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-rhythm__item,
  .page-about .about-timeline__item {
    animation: none;
  }

  .page-about .about-team,
  .page-about .about-team::after,
  .page-about .about-save,
  .page-about .about-save__dot {
    transition: none;
  }

  .page-about .about-team:hover {
    transform: none;
  }
}