.page-about {
  --ab-pad: clamp(48px, 8vw, 104px);
  --ab-gap: clamp(20px, 3.4vw, 40px);
  display: block;
  background: var(--sk-deep);
  color: var(--sk-ink);
  font-family: var(--sk-font);
}

.page-about .about-h2 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.008em;
  color: var(--sk-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 48px) 0 clamp(28px, 4vw, 56px);
  background:
    radial-gradient(112% 92% at 8% 0%, rgba(27, 58, 99, 0.62) 0%, rgba(4, 10, 23, 0) 62%),
    radial-gradient(80% 70% at 100% 100%, rgba(69, 208, 192, 0.09) 0%, rgba(4, 10, 23, 0) 55%),
    linear-gradient(180deg, var(--sk-deep) 0%, var(--sk-deep-mid) 62%, var(--sk-deep) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(118deg, rgba(143, 169, 201, 0.055) 0 1px, transparent 1px 28px),
    radial-gradient(1px 1px at 22% 18%, rgba(233, 239, 248, 0.5) 50%, transparent 50%),
    radial-gradient(1px 1px at 68% 32%, rgba(233, 239, 248, 0.35) 50%, transparent 50%),
    radial-gradient(1px 1px at 82% 74%, rgba(233, 239, 248, 0.4) 50%, transparent 50%),
    radial-gradient(1px 1px at 36% 86%, rgba(240, 195, 90, 0.35) 50%, transparent 50%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-right: clamp(0px, 6vw, 72px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: clamp(29px, 5.4vw, 62px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--sk-ink);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 28px) 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.82;
  color: var(--sk-muted);
}

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

.page-about .about-hero__stage {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__media {
  margin: clamp(22px, 3.6vw, 40px) 0 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: var(--ab-pad) 0;
  background: linear-gradient(180deg, var(--sk-deep) 0%, var(--sk-deep-mid) 100%);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
}

.page-about .about-origin__prose p {
  margin: 0 0 1.05em;
  color: var(--sk-muted);
  font-size: 15.5px;
  line-height: 1.82;
}

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

.page-about .about-origin__quote {
  margin: 0;
  padding: 6px 0 6px clamp(14px, 2vw, 24px);
  border-left: 2px solid var(--sk-gold);
}

.page-about .about-origin__quote p {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.62;
  font-weight: 700;
  color: var(--sk-ink);
}

.page-about .about-origin__meta {
  margin: 14px 0 0;
  padding-left: clamp(14px, 2vw, 24px);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--sk-faint);
}

/* ---------- 沿革主轴 ---------- */
.page-about .about-log {
  padding: var(--ab-pad) 0;
  background:
    radial-gradient(90% 60% at 88% 12%, rgba(27, 58, 99, 0.45) 0%, rgba(4, 10, 23, 0) 60%),
    var(--sk-deep-mid);
}

.page-about .about-log__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 clamp(24px, 3vw, 36px);
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, transparent 0%, var(--sk-line) 8%, var(--sk-line) 88%, transparent 100%);
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  left: -1px;
  top: 4px;
  bottom: 8%;
  width: 17px;
  background-image: radial-gradient(1.5px 1.5px at 50% 0%, rgba(69, 208, 192, 0.5) 50%, transparent 50%);
  background-size: 17px 96px;
  background-repeat: repeat-y;
  pointer-events: none;
  opacity: 0.7;
}

.page-about .about-phase {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px);
}

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

.page-about .about-phase__dot {
  position: absolute;
  left: calc(clamp(24px, 3vw, 36px) * -1);
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--sk-hover);
  background: var(--sk-deep);
  transition: border-color var(--sk-ease), background-color var(--sk-ease), box-shadow var(--sk-ease);
}

.page-about .about-phase:hover .about-phase__dot {
  border-color: var(--sk-gold);
  background: var(--sk-gold);
  box-shadow: 0 0 0 4px rgba(240, 195, 90, 0.14);
}

.page-about .about-phase__when {
  display: block;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--sk-gold);
}

.page-about .about-phase__title {
  margin: 8px 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--sk-ink);
}

.page-about .about-phase__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sk-muted);
}

.page-about .about-phase__cover {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 12px 0 0;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sk-cyan);
}

.page-about .about-phase__cover span {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--sk-faint);
}

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

.page-about .about-log__media img {
  aspect-ratio: 1000 / 1200;
  object-fit: cover;
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-scale {
  padding: var(--ab-pad) 0;
  background: var(--sk-deep);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 28px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-metric {
  position: relative;
  padding: 22px 0 0;
  border-top: 1px solid var(--sk-line);
}

.page-about .about-metric::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 34px;
  height: 1px;
  background: var(--sk-cyan);
}

.page-about .about-metric--hot::before {
  width: 56px;
  background: var(--sk-orange);
}

.page-about .about-metric__label {
  margin: 0;
  font-family: var(--sk-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sk-faint);
}

.page-about .about-metric__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 12px 0 10px;
  line-height: 1;
}

.page-about .about-metric__num {
  font-family: var(--sk-mono);
  font-size: clamp(36px, 4.4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--sk-cyan);
}

.page-about .about-metric--hot .about-metric__num {
  color: var(--sk-orange);
}

.page-about .about-metric__unit {
  font-size: 13px;
  color: var(--sk-muted);
}

.page-about .about-metric__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sk-muted);
}

.page-about .about-scale__links {
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--sk-faint);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--ab-pad) 0;
  background: linear-gradient(180deg, var(--sk-deep) 0%, var(--sk-deep-mid) 45%, var(--sk-deep) 100%);
}

.page-about .about-team__lede {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--sk-muted);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .about-team__tablewrap {
  overflow-x: auto;
  border: 1px solid var(--sk-line);
  background: var(--sk-panel);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.34);
}

.page-about .about-team__caption {
  padding: 14px 16px 0;
  text-align: left;
  font-family: var(--sk-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--sk-faint);
}

.page-about .about-team__table {
  min-width: 420px;
}

.page-about .about-team__table th[scope="row"] {
  color: var(--sk-ink);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .about-team__table td:last-child {
  color: var(--sk-muted);
  font-size: 14px;
  line-height: 1.7;
}

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

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-role {
  border: 1px solid var(--sk-line);
  background: var(--sk-panel);
  transition: border-color var(--sk-ease);
}

.page-about .about-role:hover,
.page-about .about-role[open] {
  border-color: var(--sk-hover);
}

.page-about .about-role > summary {
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--sk-ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

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

.page-about .about-role > summary::after {
  content: "＋";
  font-family: var(--sk-mono);
  font-size: 14px;
  color: var(--sk-gold);
  transition: color var(--sk-ease);
}

.page-about .about-role[open] > summary::after {
  content: "－";
  color: var(--sk-cyan);
}

.page-about .about-role p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sk-muted);
}

/* ---------- 两道流程 ---------- */
.page-about .about-flow {
  padding: var(--ab-pad) 0;
  background: var(--sk-deep);
}

.page-about .about-flow__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 20px 22px 0;
  border-top: 1px solid var(--sk-line);
}

.page-about .about-flow__idx {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--sk-gold);
}

.page-about .about-flow__title {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--sk-ink);
}

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

.page-about .about-timing {
  margin-top: clamp(26px, 3.6vw, 44px);
  border-top: 1px solid var(--sk-line);
}

.page-about .about-timing__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--sk-line);
}

.page-about .about-timing__label {
  font-family: var(--sk-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sk-gold);
}

.page-about .about-timing__value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--sk-muted);
}

.page-about .about-timing__row--warn .about-timing__label {
  color: var(--sk-orange);
}

.page-about .about-timing__row--warn .about-timing__value {
  color: var(--sk-faint);
  font-size: 14px;
}

/* ---------- 协作网络 ---------- */
.page-about .about-partners {
  padding: var(--ab-pad) 0;
  background:
    radial-gradient(70% 55% at 20% 20%, rgba(27, 58, 99, 0.5) 0%, rgba(4, 10, 23, 0) 62%),
    var(--sk-deep-mid);
}

.page-about .about-partners__lede {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--sk-muted);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: center;
}

.page-about .about-orbit-wrap {
  display: flex;
  justify-content: center;
  padding: 46px 0;
}

.page-about .about-orbit {
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 1px solid var(--sk-line);
  background: radial-gradient(circle at 50% 50%, rgba(10, 20, 38, 0.9) 0%, rgba(4, 10, 23, 0) 72%);
}

.page-about .about-orbit::before,
.page-about .about-orbit::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--sk-line);
  pointer-events: none;
}

.page-about .about-orbit::before {
  inset: 15%;
  opacity: 0.85;
}

.page-about .about-orbit::after {
  inset: 34%;
  opacity: 0.6;
}

.page-about .about-orbit__hub {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  font-family: var(--sk-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  line-height: 1.7;
  color: var(--sk-gold);
}

.page-about .about-orbit__dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 9px;
  height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border-radius: 50%;
  background: var(--sk-hover);
  transform: rotate(var(--a)) translateY(var(--r));
  transition: background-color var(--sk-ease), box-shadow var(--sk-ease);
}

.page-about .about-orbit__dot--media {
  --r: -150px;
  background: var(--sk-cyan);
}

.page-about .about-orbit__dot--fan {
  --r: -104px;
  background: var(--sk-hover);
}

.page-about .about-orbit__dot:hover {
  background: var(--sk-gold);
  box-shadow: 0 0 0 4px rgba(240, 195, 90, 0.16);
}

.page-about .about-orbit__dot > span {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 9px);
  transform: translateX(-50%) rotate(calc(var(--a) * -1));
  white-space: nowrap;
  padding: 3px 8px;
  font-family: var(--sk-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sk-cyan);
  background: var(--sk-panel);
  border: 1px solid var(--sk-line);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--sk-ease);
}

.page-about .about-orbit__dot:hover > span {
  opacity: 1;
}

.page-about .about-partners__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
}

.page-about .about-partner {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--sk-line);
  background: var(--sk-panel);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.32);
}

.page-about .about-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 42px;
  background: var(--sk-cyan);
}

.page-about .about-partner--fan::before {
  background: var(--sk-gold);
}

.page-about .about-partner__num {
  margin: 0;
  font-family: var(--sk-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sk-cyan);
}

.page-about .about-partner--fan .about-partner__num {
  color: var(--sk-gold);
}

.page-about .about-partner__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--sk-ink);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sk-muted);
}

/* ---------- 来聊聊 ---------- */
.page-about .about-talk {
  padding: var(--ab-pad) 0;
  background:
    radial-gradient(90% 80% at 50% 120%, rgba(240, 195, 90, 0.1) 0%, rgba(4, 10, 23, 0) 60%),
    var(--sk-deep);
}

.page-about .about-talk__inner {
  border-top: 1px solid var(--sk-line);
  padding-top: clamp(28px, 4vw, 48px);
}

.page-about .about-talk__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sk-muted);
}

.page-about .about-talk__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .about-talk__info {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .about-talk__item {
  padding-top: 14px;
  border-top: 1px solid var(--sk-line);
}

.page-about .about-talk__label {
  margin: 0;
  font-family: var(--sk-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sk-faint);
}

.page-about .about-talk__value {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sk-ink);
  word-break: break-word;
}

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

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

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

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

  .page-about .about-timing__row {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__note {
    display: block;
    position: absolute;
    right: clamp(16px, 4vw, 40px);
    top: 4px;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--sk-faint);
    text-orientation: mixed;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-origin__aside {
    padding-top: 42px;
  }

  .page-about .about-log__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-log__media {
    position: sticky;
    top: 96px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-team__media {
    transform: translateY(-28px);
  }

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

  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3.6vw, 48px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-partner:nth-child(2) {
    transform: translateY(26px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(20px, 2.6vw, 34px);
  }

  .page-about .about-talk__info {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-phase__cover {
    opacity: 0.3;
    transition: opacity var(--sk-ease);
  }

  .page-about .about-phase:hover .about-phase__cover {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase__dot,
  .page-about .about-phase__cover,
  .page-about .about-orbit__dot,
  .page-about .about-orbit__dot > span,
  .page-about .about-role {
    transition: none;
  }
}

.page-about {
  --a: var(--fan);
}