.page-about {
  background: var(--ink-900);
  color: var(--text-100);
  overflow-x: hidden;
}

.page-about [id] {
  scroll-margin-top: 84px;
}

.page-about .about-topline {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(36px, 6vw, 76px) 0 clamp(28px, 4vw, 44px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -32%;
  right: -20%;
  width: min(720px, 92vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(53, 242, 208, 0.20), rgba(53, 242, 208, 0) 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  bottom: -46%;
  left: -24%;
  width: min(560px, 82vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(245, 185, 66, 0.14), rgba(245, 185, 66, 0) 65%);
  pointer-events: none;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon-400);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 22ch;
  font-size: clamp(27px, 5vw, 50px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-100);
}

.page-about .about-hero__mark {
  color: var(--neon-300);
  background-image: linear-gradient(transparent 64%, rgba(53, 242, 208, 0.22) 64%);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-200);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-hero__fact .stat__value {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.05;
}

.page-about .about-hero__fact small {
  margin-left: 3px;
  font-family: var(--font-sans);
  font-size: 0.48em;
  font-weight: 500;
  color: var(--text-200);
}

.page-about .about-hero__media {
  margin: clamp(28px, 4vw, 48px) auto 0;
}

.page-about .about-hero__media .media__frame {
  border: 1px solid var(--line-600);
}

/* ---------- 页内章节条 ---------- */
.page-about .about-toc {
  border-top: 1px solid var(--line-600);
  border-bottom: 1px solid var(--line-600);
  background: var(--ink-800);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__list a {
  display: block;
  white-space: nowrap;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--text-300);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--neon-400);
  border-color: var(--line-600);
  background: var(--ink-700);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--line-600);
}

/* ---------- 01 轮次时间线 ---------- */
.page-about .about-round__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
}

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

.page-about .about-round__item {
  position: relative;
  padding: 0 0 30px 32px;
}

.page-about .about-round__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--neon-400);
  z-index: 1;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-round__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 21px;
  bottom: 0;
  width: 1px;
  background: var(--line-600);
}

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

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

.page-about .about-round__item:hover::before,
.page-about .about-round__item:focus-within::before {
  background: var(--neon-400);
  box-shadow: 0 0 0 6px rgba(53, 242, 208, 0.12);
}

.page-about .about-round__time {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber-400);
}

.page-about .about-round__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .about-round__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-200);
}

.page-about .about-round__aside {
  padding: 0;
  overflow: hidden;
}

.page-about .about-round__aside-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-round__aside-row:last-child {
  border-bottom: 0;
}

.page-about .about-round__aside-v {
  font-size: 19px;
  font-weight: 700;
  color: var(--neon-400);
}

.page-about .about-round__aside-k {
  font-size: 13px;
  color: var(--text-300);
}

/* ---------- 02 流程 ---------- */
.page-about .about-flow__board {
  position: relative;
  border: 1px solid var(--line-600);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-flow__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.55);
  pointer-events: none;
}

.page-about .about-flow__steps {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
}

.page-about .about-flow__step {
  padding: clamp(20px, 2.6vw, 28px) clamp(16px, 2.2vw, 24px);
  background: rgba(10, 32, 26, 0.88);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-flow__step:hover {
  background: rgba(18, 49, 40, 0.92);
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 12px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--neon-400);
}

.page-about .about-flow__h {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .about-flow__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-200);
}

.page-about .about-flow__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-300);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-team__roles {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
  border-top: 1px solid var(--line-600);
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-team__role {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 20px 16px;
  background: var(--ink-900);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-team__role:hover {
  background: var(--ink-800);
}

.page-about .about-team__count {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber-400);
}

.page-about .about-team__role-h {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .about-team__role-p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-200);
}

/* ---------- 04 会员三档 ---------- */
.page-about .about-member__tiers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-tier {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ink-800);
  box-shadow: inset 0 0 0 1px var(--line-600);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-tier:hover {
  background: var(--ink-700);
}

.page-about .about-tier--pro {
  background: linear-gradient(158deg, var(--ink-700), var(--ink-800) 70%);
  box-shadow: inset 0 0 0 1px var(--neon-400);
}

.page-about .about-tier--pro:hover {
  background: linear-gradient(158deg, var(--ink-700), var(--ink-700));
}

.page-about .about-tier__head {
  display: grid;
  gap: 4px;
}

.page-about .about-tier__idx {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-300);
}

.page-about .about-tier__name {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-100);
}

.page-about .about-tier--pro .about-tier__name {
  color: var(--neon-300);
}

.page-about .about-tier__for {
  margin: 0;
  font-size: 13px;
  color: var(--amber-400);
}

.page-about .about-tier__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-200);
}

.page-about .about-tier__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-200);
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 16px;
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--neon-400);
  transform: rotate(45deg);
}

.page-about .about-tier__bar {
  position: relative;
  height: 6px;
  margin-top: auto;
  background: var(--ink-900);
  box-shadow: inset 0 0 0 1px var(--line-600);
  overflow: hidden;
}

.page-about .about-tier__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--neon-400), var(--neon-300));
}

.page-about .about-tier__fill--basic {
  width: 34%;
}

.page-about .about-tier__fill--plus {
  width: 68%;
}

.page-about .about-tier__fill--pro {
  width: 100%;
  background: linear-gradient(90deg, var(--neon-400), var(--amber-400));
}

.page-about .about-tier__range {
  margin: 0;
  font-size: 12px;
  color: var(--text-300);
}

.page-about .about-member__detail,
.page-about .about-partners__detail {
  margin-top: 24px;
  border: 1px solid var(--line-600);
  background: var(--ink-800);
}

.page-about .about-member__detail summary,
.page-about .about-partners__detail summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--neon-300);
  cursor: pointer;
  list-style: none;
}

.page-about .about-member__detail summary::-webkit-details-marker,
.page-about .about-partners__detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-member__detail summary::before,
.page-about .about-partners__detail summary::before {
  content: "+";
  display: inline-block;
  width: 18px;
  font-family: var(--font-mono);
  color: var(--amber-400);
}

.page-about .about-member__detail[open] summary::before,
.page-about .about-partners__detail[open] summary::before {
  content: "–";
}

.page-about .about-member__detail p,
.page-about .about-partners__detail p {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-200);
}

/* ---------- 05 案例合集 ---------- */
.page-about .about-cases__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-cases__h {
  margin: 0 0 18px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-300);
}

.page-about .about-cases__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-cases__way {
  padding: 18px 20px;
  background: var(--ink-800);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-cases__way:hover {
  background: var(--ink-700);
}

.page-about .about-cases__way-k {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon-400);
}

.page-about .about-cases__way p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-200);
}

.page-about .about-cases__scenes {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-cases__scene {
  padding: 20px;
  background: linear-gradient(150deg, var(--ink-700), var(--ink-800));
  border-left: 2px solid var(--amber-400);
}

.page-about .about-cases__scene-tag {
  margin-bottom: 12px;
}

.page-about .about-cases__scene-p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-200);
}

/* ---------- 06 发展时间线 ---------- */
.page-about .about-history__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-history__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 30px 30px;
}

.page-about .about-history__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--amber-400);
  z-index: 1;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-history__item::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 23px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-600), rgba(30, 74, 60, 0.25));
}

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

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

.page-about .about-history__item:hover::before {
  background: var(--neon-400);
  border-color: var(--neon-400);
}

.page-about .about-history__year {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--neon-400);
}

.page-about .about-history__h {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .about-history__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-200);
}

.page-about .about-history__stat {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber-400);
}

/* ---------- 07 合作与响应 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-partners__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ink-800);
  box-shadow: inset 0 0 0 1px var(--line-600);
}

.page-about .about-partners__card--contact {
  background: linear-gradient(158deg, var(--ink-700), var(--ink-800));
  box-shadow: inset 0 0 0 1px var(--neon-400);
}

.page-about .about-partners__num {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--amber-400);
}

.page-about .about-partners__h {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .about-partners__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-200);
}

.page-about .about-partners__p strong {
  color: var(--neon-300);
  font-weight: 600;
}

.page-about .about-partners__link {
  align-self: flex-start;
  margin-top: auto;
  font-size: 14px;
  color: var(--neon-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-partners__link:hover,
.page-about .about-partners__link:focus-visible {
  color: var(--neon-300);
  border-color: var(--neon-300);
}

.page-about .about-partners__contact {
  display: grid;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-200);
}

.page-about .about-partners__contact span {
  display: inline-block;
  min-width: 42px;
  color: var(--text-300);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  border-bottom: 0;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(53, 242, 208, 0.10), rgba(53, 242, 208, 0) 58%),
    var(--ink-800);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta__h {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--text-100);
}

.page-about .about-cta__p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-200);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__foot {
  margin: 0;
  font-size: 13px;
  color: var(--text-300);
}

.page-about .about-cta__foot a {
  color: var(--neon-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.35);
}

.page-about .about-cta__foot a:hover,
.page-about .about-cta__foot a:focus-visible {
  color: var(--neon-300);
  border-color: var(--neon-300);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-history__item {
    grid-template-columns: 88px minmax(0, 1fr) 140px;
    gap: 8px 24px;
    align-items: baseline;
    padding-left: 34px;
  }

  .page-about .about-history__stat {
    text-align: right;
  }
}

@media (min-width: 880px) {
  .page-about .about-round__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cases__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: stretch;
  }
}

@media (min-width: 900px) {
  .page-about .about-member__tiers {
    grid-template-columns: minmax(0, 5fr) minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-cta__foot {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-round__item::before,
  .page-about .about-history__item::before,
  .page-about .about-flow__step,
  .page-about .about-tier,
  .page-about .about-team__role,
  .page-about .about-toc__list a {
    transition: none;
  }
}