.page-about {
  background: var(--ink-900);
  color: var(--text-body);
  font-family: var(--font-body);
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--line-600);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(156, 176, 206, .16) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 82%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--emerald-500) 34%, var(--flare-500) 66%, transparent);
  opacity: .45;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
}

.page-about .about-hero__kicker {
  color: var(--emerald-500);
  margin-bottom: 14px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-sans);
  font-size: clamp(32px, 6.4vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--ice-100);
  margin: 0 0 clamp(16px, 2vw, 24px);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0 0 14px;
  font-size: clamp(14px, 1.2vw, 16px);
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 2.4vw, 28px) 0 16px;
}

.page-about .about-hero__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(16px, 2vw, 28px);
  align-content: start;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-fact:first-child,
.page-about .about-fact:nth-child(2) {
  border-top: 1px solid transparent;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice-100);
  letter-spacing: -.02em;
}

.page-about .about-fact:nth-child(3) .about-fact__num {
  color: var(--emerald-500);
}

.page-about .about-fact:nth-child(4) .about-fact__num {
  color: var(--amber-400);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体：左索引 + 右堆叠画板 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(28px, 4vw, 56px);
}

.page-about .about-rail__label {
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid var(--line-600);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--text-body);
  text-decoration: none;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-about .about-rail__link .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate-500);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-left-color: var(--emerald-500);
  background: rgba(18, 196, 139, .08);
  color: var(--ice-100);
}

.page-about .about-rail__link:hover .num {
  color: var(--emerald-500);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-section {
  padding: clamp(22px, 3.2vw, 44px);
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  margin-top: -6px;
}

.page-about .about-section__head {
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-section__body p {
  margin: 0 0 14px;
  max-width: 68ch;
}

.page-about .about-section__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-section .section__kicker {
  color: var(--emerald-500);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 36px);
  padding: 4px 0 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--emerald-500), var(--line-600) 30%, var(--line-600));
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: clamp(12px, 1.6vw, 20px);
  padding-bottom: clamp(22px, 3vw, 34px);
}

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

.page-about .about-timeline__dot {
  grid-column: 1;
  width: 15px;
  height: 15px;
  margin-top: 10px;
  border-radius: 50%;
  border: 1px solid var(--emerald-500);
  background: var(--ink-900);
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__dot::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--emerald-500);
  opacity: .5;
  transition: opacity .16s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot::after {
  opacity: 1;
}

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

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 9vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--slate-500);
  transition: color .16s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year {
  color: var(--emerald-500);
}

.page-about .about-timeline__item:last-child .about-timeline__year {
  color: var(--flare-500);
}

.page-about .about-timeline__ver {
  display: block;
  margin: 10px 0 6px;
  color: var(--amber-400);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ice-100);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

/* ---------- 图片容器兜底 ---------- */
.page-about .media-frame {
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-600);
  border-radius: var(--r-md);
  background:
    linear-gradient(135deg, rgba(18, 196, 139, .08), transparent 60%),
    var(--panel-700);
  margin: 0;
}

.page-about .media-frame--wide {
  aspect-ratio: 21 / 9;
}

.page-about .media-frame--square {
  aspect-ratio: 1 / 1;
}

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

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

/* ---------- 双栏图文 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

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

/* ---------- 三道流程 ---------- */
.page-about .about-process {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-process__item {
  background: var(--panel-700);
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  display: grid;
  gap: 6px;
  transition: background .16s var(--ease);
}

.page-about .about-process__item:hover {
  background: rgba(18, 196, 139, .09);
}

.page-about .about-process__step {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--emerald-500);
  letter-spacing: .08em;
}

.page-about .about-process__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--ice-100);
}

.page-about .about-process__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 会员等级 Tab ---------- */
.page-about .about-tiers {
  margin: clamp(16px, 2.2vw, 24px) 0 clamp(24px, 3vw, 36px);
  border: 1px solid var(--line-600);
  border-radius: var(--r-md);
  background: rgba(12, 27, 51, .6);
  overflow: hidden;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px clamp(12px, 2vw, 18px);
  border-bottom: 1px solid var(--line-600);
  background: rgba(7, 15, 30, .5);
}

.page-about .tab {
  appearance: none;
  border: 1px solid var(--line-600);
  background: transparent;
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-about .tab:hover {
  border-color: var(--emerald-500);
  color: var(--ice-100);
}

.page-about .tab.is-active {
  border-color: var(--emerald-500);
  background: rgba(18, 196, 139, .14);
  color: var(--ice-100);
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--emerald-500);
  outline-offset: 2px;
}

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

.page-about .tabpanel.is-active {
  display: block;
}

.page-about .about-tier {
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .about-tier:focus-visible {
  outline: 2px solid var(--emerald-500);
  outline-offset: -2px;
}

.page-about .about-tier__lead {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .about-tier__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ice-100);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 1px;
  background: var(--emerald-500);
}

/* ---------- 权益对照表 ---------- */
.page-about .about-table__wrap {
  overflow-x: auto;
  border: 1px solid var(--line-600);
  border-radius: var(--r-md);
  background: rgba(12, 27, 51, .45);
}

.page-about .about-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table__caption {
  caption-side: top;
  text-align: left;
  padding: 14px clamp(12px, 2vw, 20px) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px clamp(12px, 2vw, 20px);
  text-align: left;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table thead th {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  color: var(--ice-100);
  background: rgba(7, 15, 30, .6);
}

.page-about .about-table tbody th {
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-table tbody td {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-body);
}

.page-about .about-table tbody tr {
  transition: background .16s var(--ease);
}

.page-about .about-table tbody tr:hover,
.page-about .about-table tbody tr:focus-within {
  background: rgba(18, 196, 139, .1);
}

.page-about .about-table tbody tr:hover td {
  color: var(--ice-100);
}

.page-about .about-member__extra {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-member__link {
  margin: 18px 0 0;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-coverage__cell {
  background: var(--panel-700);
  padding: clamp(18px, 2.6vw, 30px);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-coverage__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ice-100);
}

.page-about .about-coverage__cell:nth-child(1) .about-coverage__num {
  color: var(--emerald-500);
}

.page-about .about-coverage__cell:nth-child(3) .about-coverage__num {
  color: var(--amber-400);
}

.page-about .about-coverage__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-coverage__text {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--text-body);
}

.page-about .about-coverage__note {
  margin-top: clamp(18px, 2.4vw, 26px);
}

/* ---------- 行业认可 ---------- */
.page-about .about-honor__list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
}

.page-about .about-honor__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-honor__item:first-child {
  border-top: 1px solid var(--line-600);
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--flare-500);
  letter-spacing: -.01em;
}

.page-about .about-honor__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ice-100);
}

.page-about .about-honor__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  background:
    linear-gradient(120deg, rgba(18, 196, 139, .14), transparent 52%),
    linear-gradient(300deg, rgba(255, 90, 43, .12), transparent 46%),
    var(--panel-700);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.22;
  color: var(--ice-100);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-coverage__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-honor__item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

  .page-about .about-split--flip .about-split__media {
    order: 2;
  }
}

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 4px;
  }

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

  .page-about .about-rail__link {
    padding: 9px 12px;
  }

  .page-about .about-fact:first-child {
    border-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-timeline__dot::after,
  .page-about .about-timeline__year,
  .page-about .tab,
  .page-about .about-process__item,
  .page-about .about-table tbody tr {
    transition: none;
  }
}