.page-about {
  --about-hair: rgba(60, 74, 85, 0.55);
  --about-glow: rgba(53, 229, 214, 0.18);
}

.page-about .about-textlink {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--glass-line);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-textlink:hover,
.page-about .about-textlink:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-textlink--dark {
  color: #1b5f5a;
  border-bottom-color: rgba(27, 95, 90, 0.4);
}

.page-about .about-textlink--dark:hover,
.page-about .about-textlink--dark:focus-visible {
  color: #0f3f3b;
  border-bottom-color: #0f3f3b;
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(78px, 9vh, 118px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(620px, 78vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(138, 92, 255, 0.24), transparent 62%);
  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(--about-glow) 18%, rgba(138, 92, 255, 0.22) 82%, transparent);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: 0.4em 0 0;
  max-width: 15ch;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(2.3rem, 7.6vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  color: rgba(242, 233, 220, 0.86);
}

.page-about .about-hero__aside {
  border-left: 2px solid var(--orange);
  padding: 4px 0 4px 18px;
}

.page-about .about-hero__aside-key {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero__aside-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--gray);
}

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

.page-about .about-hero__aside-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 1px;
  background: var(--violet);
}

.page-about .about-hero__strip {
  margin-top: clamp(36px, 5vw, 58px);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 入口定位 ---------- */

.page-about .about-position__grid {
  margin-top: 34px;
}

.page-about .about-position__lead p {
  margin: 0 0 18px;
  color: rgba(242, 233, 220, 0.84);
}

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

.page-about .about-position__panel {
  align-self: start;
  padding: 22px 20px;
}

.page-about .about-position__facts {
  margin: 16px 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-position__facts li {
  display: grid;
  gap: 3px;
  padding-bottom: 11px;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .about-position__facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-position__fact-k {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-position__fact-v {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: 0.01em;
}

/* ---------- 发展阶段 ---------- */

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

.page-about .about-media--wide {
  margin: clamp(28px, 4vw, 44px) auto;
  width: min(var(--shell-max), 100%);
  padding-inline: var(--pad-x);
}

.page-about .about-media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--ink-800);
}

.page-about .about-media__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(53, 229, 214, 0.12), transparent 46%, rgba(138, 92, 255, 0.16));
  pointer-events: none;
}

.page-about .about-media--wide .about-media__frame {
  aspect-ratio: 14 / 9;
  border-left: 2px solid var(--cyan);
}

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

.page-about .about-media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--gray);
}

.page-about .about-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 8px;
}

.page-about .about-phase__summary {
  display: block;
  width: 100%;
  padding: 20px 18px 20px 0;
  border: 0;
  border-top: 1px solid var(--about-hair);
  background: none;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
  transition: border-color 180ms var(--ease);
}

.page-about .about-phase__summary:hover,
.page-about .about-phase__summary:focus-visible {
  border-top-color: var(--cyan);
}

.page-about .expand-group[data-open] > .about-phase__summary {
  border-top-color: var(--cyan);
}

.page-about .about-phase__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-phase__year {
  display: block;
  margin-top: 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .about-phase__name {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(242, 233, 220, 0.82);
}

.page-about .about-phase__body {
  padding: 0 18px 20px 0;
}

.page-about .about-phase__list {
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  display: grid;
  gap: 9px;
  border-top: 1px dashed var(--about-hair);
}

.page-about .about-phase__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--gray);
}

.page-about .about-phase__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--violet);
  transform: rotate(45deg);
}

/* ---------- 运营规模 ---------- */

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-scale__cell {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: 24px 20px 22px;
  background: var(--ink-900);
  transition: background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-scale__cell:hover,
.page-about .about-scale__cell:focus-within {
  background: var(--ink-800);
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-about .about-scale__value {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-scale__unit {
  margin-left: 5px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: rgba(240, 180, 41, 0.7);
}

.page-about .about-scale__label {
  margin-top: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-scale__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-scale__foot {
  margin-top: 16px;
}

/* ---------- 团队构成 ---------- */

.page-about .about-team__panel {
  padding: clamp(24px, 4vw, 44px);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-team__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-team__title {
  margin: 10px 0 0;
  color: var(--ink-800);
}

.page-about .about-team__lead {
  margin: 16px 0 0;
  max-width: 44ch;
  color: rgba(26, 19, 16, 0.78);
}

.page-about .about-team__list {
  margin: 26px 0 0;
  border-top: 1px solid rgba(26, 19, 16, 0.18);
}

.page-about .about-team__item {
  display: grid;
  gap: 5px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(26, 19, 16, 0.14);
}

.page-about .about-team__item dt {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-800);
}

.page-about .about-team__item dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(26, 19, 16, 0.72);
}

.page-about .about-team__count {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border: 1px solid rgba(138, 92, 255, 0.45);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: #5530c4;
  vertical-align: 1px;
}

.page-about .about-team__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(26, 19, 16, 0.72);
}

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

.page-about .about-media__frame--tall {
  aspect-ratio: 3 / 2;
  border-color: rgba(26, 19, 16, 0.22);
}

.page-about .about-team__media .about-media__caption {
  color: rgba(26, 19, 16, 0.6);
}

/* ---------- 常设机制 ---------- */

.page-about .about-mech {
  margin-top: 30px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-mech__item {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-mech__summary {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 16px;
  width: 100%;
  padding: 18px 0;
  border: 0;
  background: none;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
  transition: color 180ms var(--ease);
}

.page-about .about-mech__summary:hover,
.page-about .about-mech__summary:focus-visible {
  color: var(--cyan);
}

.page-about .about-mech__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .about-mech__name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-mech__summary:hover .about-mech__name,
.page-about .about-mech__summary:focus-visible .about-mech__name {
  color: var(--cyan);
}

.page-about .about-mech__tag {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-mech__body {
  padding: 0 0 22px;
}

.page-about .about-mech__body p {
  margin: 14px 0 0;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.82;
  color: rgba(242, 233, 220, 0.8);
}

/* ---------- 厂商生态 ---------- */

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 30px;
}

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

.page-about .about-eco__media .about-media__frame {
  aspect-ratio: 12 / 7;
  border-left: 2px solid var(--violet);
}

.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-eco__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-eco__type {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-eco__desc {
  margin: 5px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-eco__partners {
  margin-top: 34px;
  padding: 24px 22px;
}

.page-about .about-eco__partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 16px;
}

.page-about .about-eco__partner {
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-eco__partner-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-eco__partner-label {
  margin: 8px 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-eco__partner-desc {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 服务地域 ---------- */

.page-about .about-region__list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-region__item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-region__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-region__name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-region__item--lead {
  border-bottom-color: var(--cyan);
}

.page-about .about-region__item--lead .about-region__name {
  color: var(--cyan);
}

.page-about .about-region__tag {
  margin-left: auto;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  background: var(--amber);
}

.page-about .about-region__foot {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.page-about .about-region__foot p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 233, 220, 0.8);
}

.page-about .about-region__links {
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-region__links .about-textlink {
  margin-left: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__cols {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-phases {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-phase__summary {
    padding: 22px 20px 22px 0;
  }

  .page-about .about-phase__body {
    padding: 0 20px 24px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-region__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__cell,
  .page-about .about-phase__summary,
  .page-about .about-mech__summary,
  .page-about .about-textlink {
    transition: none;
  }
}