.page-about {
  --about-rule: rgba(138, 118, 63, .30);
  --about-rule-soft: rgba(138, 118, 63, .16);
  --about-rule-bright: rgba(198, 160, 70, .55);
  --about-paper-ink: rgba(18, 16, 12, .78);
}

/* ---------- 通用块 ---------- */

.page-about .about-heading {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(27px, 4.2vw, 42px);
  line-height: 1.24;
  letter-spacing: .01em;
  color: var(--paper);
  margin: 0;
}

.page-about .light-block .about-heading {
  color: var(--ink);
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(34px, 5vw, 56px);
}

.page-about .section-head .lede {
  margin-top: 16px;
  color: var(--text-dim);
}

.page-about .about-origin,
.page-about .about-system,
.page-about .about-eco,
.page-about .about-next {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-team,
.page-about .about-recognition {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .light-block .eyebrow {
  color: var(--copper);
}

.page-about .light-block .lede {
  color: rgba(18, 16, 12, .68);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 34px);
  padding: clamp(26px, 5vw, 62px) clamp(22px, 4.5vw, 56px) clamp(30px, 5vw, 58px);
  border: 1px solid var(--about-rule);
  background:
    radial-gradient(120% 150% at 4% -10%, rgba(198, 160, 70, .13), transparent 58%),
    radial-gradient(90% 120% at 100% 110%, rgba(122, 31, 31, .12), transparent 60%),
    var(--ink-2);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(40px, 7.4vw, 92px);
  line-height: 1.04;
  letter-spacing: .015em;
  color: var(--paper);
  margin: 14px 0 0;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin-top: clamp(20px, 2.6vw, 30px);
  color: var(--text-dim);
}

.page-about .about-index__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0 0 10px;
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-index li {
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  font-size: 15px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--gold-hi);
  padding-left: 7px;
}

.page-about .about-index .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
  flex: none;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(228px, .74fr);
    align-items: end;
    gap: clamp(40px, 6vw, 96px);
  }
}

/* ---------- 源起 ---------- */

.page-about .origin-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .origin-side .about-heading {
  margin-top: 14px;
}

.page-about .origin-main .prose {
  margin: 0;
}

.page-about .origin-main .prose p {
  color: var(--text-dim);
  margin: 0 0 18px;
}

.page-about .origin-main .prose p:last-child {
  margin-bottom: 0;
}

.page-about .origin-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 52px);
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: clamp(20px, 2.6vw, 28px) 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .origin-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  color: var(--gold);
  line-height: 1;
}

.page-about .stat-label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--text-soft);
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.55fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .origin-side {
    position: sticky;
    top: 110px;
    align-self: start;
  }
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: clamp(52px, 7vw, 96px) 0;
  background: var(--ink);
}

.page-about .about-timeline__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .13;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
}

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

.page-about .rail {
  position: relative;
  padding-left: 26px;
}

.page-about .rail::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-rule-bright) 10%, var(--about-rule) 90%, transparent);
}

.page-about .rail-item {
  position: relative;
  display: block;
  padding-bottom: clamp(26px, 3.4vw, 40px);
}

.page-about .rail-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--copper);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .rail-item:hover::before,
.page-about .rail-item[open]::before {
  background: var(--gold);
  border-color: var(--gold-hi);
}

.page-about .rail-item.is-current::before {
  background: var(--gold-hi);
  border-color: var(--gold-hi);
  box-shadow: 0 0 0 5px rgba(242, 212, 136, .16);
}

.page-about .rail-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  padding: 15px 18px;
  border: 1px solid var(--about-rule);
  background: linear-gradient(180deg, rgba(30, 26, 20, .94), rgba(18, 16, 12, .94));
  cursor: pointer;
  list-style: none;
  transition: border-color var(--dur) var(--ease);
}

.page-about .rail-card__head::-webkit-details-marker {
  display: none;
}

.page-about .rail-item[open] > .rail-card__head {
  border-color: var(--about-rule-bright);
}

.page-about .rail-item .rail-card__head:hover {
  border-color: rgba(198, 160, 70, .5);
}

.page-about .rail-card__version {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--gold);
  padding: 3px 8px;
  flex: none;
}

.page-about .rail-card__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

.page-about .rail-card__body {
  padding: 16px 18px 20px;
  border: 1px solid var(--about-rule);
  border-top: 0;
  background: rgba(18, 16, 12, .72);
}

.page-about .rail-card__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .rail {
    padding-left: 0;
  }

  .page-about .rail::before {
    left: 50%;
  }

  .page-about .rail-item {
    width: 50%;
    padding-right: clamp(34px, 4.5vw, 68px);
    padding-bottom: clamp(34px, 4.4vw, 56px);
  }

  .page-about .rail-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: clamp(34px, 4.5vw, 68px);
  }

  .page-about .rail-item::before {
    left: auto;
    right: -5px;
    top: 27px;
  }

  .page-about .rail-item:nth-child(even)::before {
    right: auto;
    left: -5px;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team__head {
  max-width: 60ch;
  margin-bottom: clamp(34px, 5vw, 60px);
}

.page-about .about-team__head .about-heading {
  margin-top: 14px;
}

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

.page-about .team-lead {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-bottom: clamp(40px, 5.5vw, 72px);
}

.page-about .team-prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-paper-ink);
}

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

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img,
.page-about .eco-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(176, 122, 60, .3);
}

.page-about .team-figure .media-caption,
.page-about .eco-figure .media-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .team-panels {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .team-panel {
  position: relative;
  background: #FBF7EE;
  border: 1px solid rgba(176, 122, 60, .38);
  padding: clamp(24px, 3vw, 32px) clamp(20px, 2.6vw, 28px) clamp(26px, 3.2vw, 34px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .team-panel::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 18px;
  height: 18px;
  background: var(--paper);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .team-panel:hover {
  transform: translateY(-4px);
  border-color: var(--copper);
  box-shadow: 0 20px 36px -24px rgba(58, 46, 28, .6);
}

.page-about .team-panel__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--copper);
  margin-bottom: 14px;
}

.page-about .team-panel__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 21px;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .team-panel__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mute);
  margin-bottom: 16px;
}

.page-about .team-panel__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-paper-ink);
  margin: 0 0 18px;
}

.page-about .team-panel__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid rgba(176, 122, 60, .24);
}

.page-about .team-panel__tags .tag {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--copper);
  border: 1px solid rgba(176, 122, 60, .4);
  padding: 3px 9px;
  line-height: 1.5;
}

@media (min-width: 860px) {
  .page-about .team-lead {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .team-panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 栏目体系 ---------- */

.page-about .system-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .system-item {
  display: grid;
  gap: 8px;
  padding: clamp(22px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .system-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .system-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

.page-about .system-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0;
}

.page-about .system-foot {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

@media (min-width: 820px) {
  .page-about .system-item {
    grid-template-columns: 58px minmax(0, .9fr) minmax(0, 1.6fr);
    gap: clamp(20px, 3vw, 44px);
    align-items: baseline;
  }
}

/* ---------- 协作生态 ---------- */

.page-about .eco-grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  align-items: center;
}

.page-about .eco-figure {
  margin: 0;
}

.page-about .eco-list {
  display: grid;
  gap: clamp(20px, 2.6vw, 28px);
}

.page-about .eco-item {
  padding-left: 18px;
  border-left: 1px solid var(--about-rule);
}

.page-about .eco-item__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 18px;
  color: var(--gold);
  margin: 0 0 8px;
}

.page-about .eco-item__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0;
}

.page-about .eco-note {
  margin: 0;
  padding-top: 18px;
  border-top: 1px dashed var(--about-rule);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-soft);
}

@media (min-width: 880px) {
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(44px, 6vw, 84px);
  }
}

/* ---------- 行业认可 ---------- */

.page-about .recognition-grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .recognition-side .about-heading {
  margin-top: 14px;
}

.page-about .recognition-prose {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-paper-ink);
  max-width: 44ch;
}

.page-about .recognition-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(176, 122, 60, .3);
}

.page-about .recognition-list li {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid rgba(176, 122, 60, .2);
}

.page-about .recognition-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--copper);
  flex: none;
}

.page-about .recognition-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-paper-ink);
}

@media (min-width: 860px) {
  .page-about .recognition-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: clamp(44px, 6vw, 88px);
    align-items: start;
  }
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .next-grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .next-card {
  position: relative;
  display: block;
  padding: clamp(24px, 3vw, 32px) clamp(22px, 2.8vw, 30px) clamp(46px, 4.6vw, 56px);
  border: 1px solid var(--about-rule);
  background: linear-gradient(160deg, rgba(30, 26, 20, .92), rgba(18, 16, 12, .92));
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--about-rule-bright);
  transform: translateY(-4px);
}

.page-about .next-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
  margin-bottom: 16px;
}

.page-about .next-card__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 20px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .next-card__text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  margin: 0;
}

.page-about .next-card__arrow {
  position: absolute;
  left: clamp(22px, 2.8vw, 30px);
  bottom: clamp(18px, 2.4vw, 24px);
  font-size: 18px;
  color: var(--gold);
  transition: transform var(--dur) var(--ease);
}

.page-about .next-card:hover .next-card__arrow {
  transform: translateX(6px);
}

@media (min-width: 780px) {
  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .rail-item::before,
  .page-about .rail-card__head,
  .page-about .team-panel,
  .page-about .next-card,
  .page-about .next-card__arrow {
    transition: none;
  }

  .page-about .team-panel:hover,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}