.page-about {
  --about-gap: 12px;
  --about-radius: 2px;
}

.page-about .about-hero {
  padding: 40px 0 52px;
  background:
    radial-gradient(900px 420px at 78% -12%, rgba(232, 76, 29, .18), transparent 62%),
    radial-gradient(700px 380px at 6% 108%, rgba(46, 196, 182, .1), transparent 64%);
}

.page-about .about-hero__in {
  display: grid;
  gap: 30px;
  align-items: end;
}

.page-about .about-hero__lead {
  min-width: 0;
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.4vw, 44px);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 16px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-fact__num {
  display: block;
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1.1;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .about-fact__unit {
  font-size: .48em;
  color: var(--teal);
  margin-left: 4px;
  letter-spacing: .02em;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: var(--shadow-1), var(--glow-line);
}

.page-about .about-hero__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__media .media__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--edge);
  border-top: 1px solid var(--line);
  background: rgba(11, 27, 43, .7);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: 48px 0;
}

.page-about .about-sec__head {
  display: grid;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-sec__head--tight {
  margin-bottom: 20px;
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-size: clamp(23px, 4.2vw, 32px);
  line-height: 1.26;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-sec__sub {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

/* ---------- 01 服务范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-block {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(16, 42, 62, .95), rgba(11, 27, 43, .95));
  box-shadow: var(--shadow-1), var(--glow-line);
}

.page-about .about-block__num {
  display: inline-block;
  padding: 3px 8px;
  margin-bottom: 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--flame-soft);
  border: 1px solid rgba(232, 76, 29, .45);
  border-radius: 1px;
}

.page-about .about-block h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.6vw, 26px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-block p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-scope__list {
  display: grid;
  gap: var(--about-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scope__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(16, 42, 62, .55);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-scope__item:hover {
  border-color: rgba(232, 76, 29, .55);
  background: rgba(16, 42, 62, .85);
}

.page-about .about-scope__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-size: 13px;
  color: var(--teal);
  border: 1px solid rgba(46, 196, 182, .4);
  border-radius: 50%;
}

.page-about .about-scope__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--paper);
  line-height: 1.4;
}

.page-about .about-scope__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .about-sec--timeline {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(7, 19, 32, .9), rgba(11, 27, 43, 0));
}

.page-about .about-band {
  margin: 0 0 26px;
  position: relative;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .about-band__cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--edge);
}

.page-about .about-timeline {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-track {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

.page-about .about-track__node.tabs__btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  width: 100%;
  padding: 14px 16px;
  text-align: left;
  font: inherit;
  color: var(--muted);
  background: rgba(16, 42, 62, .45);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .about-track__node.tabs__btn:hover {
  color: var(--paper);
  border-color: var(--edge);
}

.page-about .about-track__node.tabs__btn[aria-selected="true"] {
  color: var(--paper);
  border-color: var(--flame);
  background: rgba(232, 76, 29, .12);
  box-shadow: inset 3px 0 0 var(--flame);
}

.page-about .about-track__node.tabs__btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-about .about-track__code {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--flame-soft);
}

.page-about .about-track__node[aria-selected="true"] .about-track__code {
  color: var(--teal);
}

.page-about .about-track__name {
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-track__panels {
  min-width: 0;
}

.page-about .about-track__panels .tabs__panel {
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--panel);
  box-shadow: var(--shadow-1);
}

.page-about .about-track__panels h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 3vw, 21px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-track__panels p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

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

.page-about .about-track__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--paper);
}

.page-about .about-track__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--teal);
  transform: rotate(45deg);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  padding: 52px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(232, 76, 29, .16), rgba(11, 27, 43, 0) 48%),
    var(--ink-deep);
}

.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  max-width: 340px;
}

.page-about .about-team__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team__stats {
  display: grid;
  gap: var(--about-gap);
  margin-top: 4px;
}

.page-about .about-team__stat {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame);
  border-radius: var(--about-radius);
  background: rgba(16, 42, 62, .8);
}

.page-about .about-team__num {
  display: block;
  font-size: clamp(28px, 5.4vw, 38px);
  line-height: 1;
  color: var(--paper);
  letter-spacing: -.02em;
}

.page-about .about-team__role {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: .04em;
}

.page-about .about-team__stat p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 04 覆盖与节奏 ---------- */
.page-about .about-cover {
  display: grid;
  gap: 26px;
}

.page-about .about-cover__head {
  min-width: 0;
}

.page-about .about-cover__head h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.2vw, 32px);
  line-height: 1.28;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-cover__head > p {
  margin: 14px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-cover__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-gap);
  margin-top: 22px;
}

.page-about .about-cover__figure {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(16, 42, 62, .6);
}

.page-about .about-cover__figure-num {
  display: block;
  font-size: clamp(24px, 4.6vw, 32px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-cover__plus {
  font-size: .46em;
  color: var(--teal);
  margin-left: 4px;
}

.page-about .about-cover__figure-label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-cover__flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-cover__step {
  position: relative;
  padding: 20px 18px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(180deg, rgba(16, 42, 62, .92), rgba(11, 27, 43, .92));
}

.page-about .about-cover__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--flame), rgba(232, 76, 29, 0));
}

.page-about .about-cover__phase {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--teal);
}

.page-about .about-cover__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
  line-height: 1.4;
}

.page-about .about-cover__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 05 原则 ---------- */
.page-about .about-sec--principles {
  border-top: 1px solid var(--line);
}

.page-about .about-principles {
  display: grid;
  gap: 10px;
}

.page-about .principle {
  border-left: 3px solid var(--flame);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  background: rgba(16, 42, 62, .7);
  padding: 15px 18px;
}

.page-about .principle[open] {
  background: rgba(16, 42, 62, .95);
  box-shadow: var(--shadow-1);
}

.page-about .principle > summary {
  display: flex;
  gap: 12px;
  align-items: baseline;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.5;
}

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

.page-about .principle > summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.page-about .principle__idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--flame-soft);
  flex: none;
}

.page-about .principle p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 06 合作 ---------- */
.page-about .about-sec--partners {
  padding-bottom: 60px;
}

.page-about .about-partners {
  display: grid;
  gap: 24px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background:
    radial-gradient(560px 260px at 90% 0%, rgba(46, 196, 182, .14), transparent 70%),
    linear-gradient(150deg, rgba(16, 42, 62, .95), rgba(11, 27, 43, .95));
  box-shadow: var(--shadow-1), var(--glow-line);
}

.page-about .about-partners__text h2 {
  margin: 10px 0 0;
  font-size: clamp(21px, 3.8vw, 27px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-partners__text > p {
  margin: 14px 0 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-partners__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 22px;
}

.page-about .about-partners__link {
  font-size: 13px;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 196, 182, .45);
  padding-bottom: 2px;
}

.page-about .about-partners__link:hover {
  color: var(--teal-soft);
}

.page-about .about-partners__facts {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-partners__fact {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(11, 27, 43, .6);
}

.page-about .about-partners__fact .mono {
  font-size: 22px;
  color: var(--flame-soft);
  text-align: right;
}

.page-about .about-partners__fact p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-principles {
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 68px;
  }

  .page-about .about-hero__in {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-sec {
    padding: 64px 0;
  }

  .page-about .about-scope {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 16px;
    align-items: start;
  }

  .page-about .about-block {
    padding: 28px 26px 26px;
  }

  .page-about .about-timeline {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-team {
    padding: 68px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .about-cover {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 32px;
    padding: 32px 30px;
  }

  .page-about .about-partners__facts {
    align-content: space-between;
  }
}

@media (min-width: 1100px) {
  .page-about .about-cover__flow {
    gap: 14px;
  }

  .page-about .about-band img {
    aspect-ratio: 3 / 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scope__item,
  .page-about .about-track__node.tabs__btn {
    transition: none;
  }
}