.page-about {
  --about-line: rgba(92, 90, 85, 0.22);
  --about-card: #fffdf8;
  --about-card-2: #fbf6ec;
  background: var(--cream);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 34px) 0 clamp(72px, 9vw, 128px);
  background:
    radial-gradient(120% 90% at 82% 4%, rgba(217, 164, 65, 0.16), transparent 58%),
    linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 62%, var(--navy-3) 100%);
  color: var(--light-90);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(44px, 6vw, 96px);
  background: var(--cream);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

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

.page-about .about-hero__crumbs {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__crumbs .crumb {
  color: var(--light-45);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .about-hero__crumbs .crumb:hover {
  color: var(--gold-soft);
}

.page-about .about-hero__crumbs .crumb-sep {
  color: var(--light-45);
  margin: 0 8px;
}

.page-about .about-hero__crumbs .crumb--current {
  color: var(--gold);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

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

.page-about .about-h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--lamp);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 0;
  color: var(--light-70);
  font-size: 17px;
  line-height: 1.75;
  max-width: 32em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--hair-light);
}

.page-about .about-hero__figure .media-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 34px 16px 12px;
  background: linear-gradient(to top, rgba(12, 23, 41, 0.86), transparent);
  color: var(--light-90);
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------- 主体布局 ---------- */

.page-about .about-body {
  padding: clamp(44px, 6vw, 84px) 0 clamp(56px, 7vw, 96px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

/* 目录 */

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px 8px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--ink-70);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition: color 0.2s ease-out, border-color 0.2s ease-out, background 0.2s ease-out;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--ink);
  border-left-color: var(--gold);
  background: rgba(217, 164, 65, 0.1);
}

.page-about .about-toc__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
}

/* 档案卡 */

.page-about .about-archive {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  min-width: 0;
}

.page-about .arch {
  position: relative;
  background: linear-gradient(180deg, var(--about-card) 0%, var(--about-card-2) 100%);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3.4vw, 42px);
  box-shadow: var(--shadow-soft);
  scroll-margin-top: 110px;
}

.page-about .arch::before {
  content: "";
  position: absolute;
  left: clamp(22px, 3.4vw, 42px);
  top: 0;
  width: 46px;
  height: 3px;
  background: var(--gold);
  border-radius: 0 0 3px 3px;
}

.page-about .arch__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .arch__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--clay);
  background: rgba(169, 88, 58, 0.11);
  border-radius: var(--r-pill);
  padding: 4px 11px;
  flex: 0 0 auto;
}

.page-about .arch__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 31px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .arch__lead {
  margin: 0 0 8px;
  color: var(--ink-70);
  font-size: 15px;
  line-height: 1.7;
  max-width: 32em;
}

.page-about .arch__body p {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-70);
  max-width: 32em;
}

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

.page-about .arch__figure {
  margin: 22px 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  position: relative;
}

.page-about .arch__figure .media-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 30px 14px 11px;
  background: linear-gradient(to top, rgba(12, 23, 41, 0.84), transparent);
  color: var(--light-90);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-about .arch__figure--square {
  max-width: 420px;
}

.page-about .arch__tags {
  margin-top: 22px;
}

/* 折叠补充 */

.page-about .arch__more {
  margin-top: 22px;
  border-top: 1px dashed var(--about-line);
  padding-top: 14px;
}

.page-about .arch__more > summary {
  display: flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--clay);
  transition: color 0.2s ease-out;
}

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

.page-about .arch__more > summary::before {
  content: "+";
  font-family: var(--font-data);
  font-size: 17px;
  line-height: 1;
  color: var(--gold-deep);
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--gold-soft);
  border-radius: 50%;
  flex: 0 0 auto;
  transition: transform 0.2s ease-out;
}

.page-about .arch__more[open] > summary::before {
  content: "−";
  transform: rotate(180deg);
}

.page-about .arch__more > summary:hover {
  color: var(--ink);
}

.page-about .arch__more-body {
  padding-top: 12px;
}

.page-about .arch__more-body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-70);
  max-width: 32em;
}

/* ---------- 发展时间线 ---------- */

.page-about .arch--road {
  background: linear-gradient(180deg, #fffdf8 0%, #f6efe0 100%);
}

.page-about .dev-track {
  list-style: none;
  display: flex;
  gap: 18px;
  margin: 20px 0 0;
  padding: 30px 4px 22px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--about-line);
}

.page-about .dev-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .dev-track::-webkit-scrollbar-thumb {
  background: var(--gold-soft);
  border-radius: var(--r-pill);
}

.page-about .dev-item {
  position: relative;
  flex: 0 0 clamp(196px, 62vw, 252px);
  scroll-snap-align: start;
  padding-top: 30px;
}

.page-about .dev-item::before {
  content: "";
  position: absolute;
  top: 13px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--gold);
  transform: rotate(-16deg);
  transform-origin: left center;
}

.page-about .dev-item::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 30px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-deep);
}

.page-about .dev-item--now::before {
  background: var(--ember);
}

.page-about .dev-item--now::after {
  background: var(--ember);
}

.page-about .dev-year {
  display: block;
  font-family: var(--font-data);
  font-size: 21px;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .dev-item--now .dev-year {
  color: var(--ember);
}

.page-about .dev-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-70);
}

/* ---------- 观赛节奏数据 ---------- */

.page-about .scene-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .scene-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  background: rgba(16, 28, 51, 0.045);
  border-left: 3px solid var(--gold);
}

.page-about .scene-stat__num {
  font-family: var(--font-data);
  font-size: 26px;
  letter-spacing: 0.08em;
  color: var(--ink);
  flex: 0 0 auto;
}

.page-about .scene-stat__label {
  font-size: 15px;
  color: var(--ink-70);
  line-height: 1.5;
}

/* ---------- 合作 ---------- */

.page-about .coop-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .coop-item {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-70);
  padding: 11px 14px;
  border-radius: var(--r-sm);
  background: rgba(169, 88, 58, 0.07);
}

.page-about .coop-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clay);
  flex: 0 0 8px;
  margin-top: 8px;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .scene-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .scene-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-toc__link {
    font-size: 14px;
  }

  .page-about .arch--road .dev-track {
    padding-bottom: 26px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-archive {
    gap: clamp(32px, 3.6vw, 60px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .arch__more > summary,
  .page-about .arch__more > summary::before {
    transition: none;
  }
}
</main>