.page-about {
  --about-rail: 280px;
  --about-hair: rgba(28, 74, 62, 0.9);
  position: relative;
  display: block;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 56px) 0 clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(115% 86% at 88% -6%, rgba(242, 193, 78, 0.17), transparent 58%),
    radial-gradient(90% 70% at 6% 104%, rgba(56, 242, 208, 0.09), transparent 62%);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 16%;
  width: 58%;
  height: 2px;
  pointer-events: none;
  transform: rotate(-11deg);
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0.45;
}

.page-about .about-masthead > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-masthead .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-masthead__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-masthead__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-masthead__intro {
  margin: 18px 0 0;
  max-width: 36em;
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--muted);
}

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

.page-about .about-masthead__aside .note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  max-width: 30em;
}

.page-about .about-masthead__stats {
  margin-top: clamp(32px, 5vw, 54px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

/* ---------- 主体两列 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 5vw, 60px);
  padding-top: clamp(34px, 5vw, 62px);
  padding-bottom: clamp(52px, 8vw, 108px);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec .section-head {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-sec__num {
  display: inline-block;
  margin-right: 0.7em;
  padding: 0.14em 0.44em;
  font-family: var(--font-mono);
  font-size: 0.5em;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(242, 193, 78, 0.42);
  border-radius: 2px;
  vertical-align: middle;
}

.page-about .about-sec .prose p {
  margin: 0 0 1.05em;
}

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

/* ---------- 术语悬停 ---------- */
.page-about .gloss {
  position: relative;
  color: var(--gold);
  border-bottom: 1px dashed rgba(242, 193, 78, 0.55);
  cursor: help;
}

.page-about .gloss::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 5;
  width: max-content;
  max-width: min(280px, 78vw);
  padding: 9px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--gold);
  border-radius: var(--radius);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}

.page-about .gloss:hover::after,
.page-about .gloss:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: 0;
  position: relative;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-figure--wide {
  margin-bottom: clamp(22px, 3vw, 30px);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--side img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 5;
}

.page-about .about-claim {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 30px);
}

/* ---------- 团队比例条 ---------- */
.page-about .about-bars {
  display: grid;
  gap: 20px;
  margin-top: clamp(24px, 3vw, 34px);
  padding: clamp(20px, 3vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .about-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-bar__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
}

.page-about .about-bar__track {
  margin-top: 9px;
  height: 8px;
  border-radius: 999px;
  background: var(--ink-deep);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
  transition: width 820ms cubic-bezier(0.22, 0.72, 0.2, 1);
}

.page-about .about-bar__fill--cyan {
  background: linear-gradient(90deg, rgba(56, 242, 208, 0.55), var(--cyan));
}

.page-about .about-bar__fill--signal {
  background: linear-gradient(90deg, rgba(255, 90, 43, 0.55), var(--signal));
}

.page-about .about-bar__fill--muted {
  background: linear-gradient(90deg, var(--line), var(--line-soft));
}

.page-about [data-reveal]:not([data-revealed]) .about-bar__fill {
  width: 0;
}

.page-about .about-bar__desc {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-team__tail {
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 数据规范全宽卡 ---------- */
.page-about .about-standards {
  margin-top: clamp(34px, 5vw, 58px);
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(242, 193, 78, 0.09), transparent 46%),
    var(--panel-2);
}

.page-about .about-standards__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-standards__lead {
  margin: 12px 0 0;
  max-width: 44em;
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-standards__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-standards__item {
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.page-about .about-standards__k {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-standards__k span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-standards__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-standards__foot {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-develop__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 38px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(242, 193, 78, 0.28) 46%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.2vw, 34px);
  outline-offset: 6px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 193, 78, 0.14);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  transform: scale(1.22);
  box-shadow: 0 0 0 7px rgba(56, 242, 208, 0.16);
}

.page-about .about-timeline__tag {
  display: inline-block;
  margin: 0 0 8px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--gold);
  border-radius: 999px;
}

.page-about .about-timeline__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 合作卡片 ---------- */
.page-about .about-partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

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

.page-about .about-partner__card .card__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-partner__card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-partner__card .card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 联系 ---------- */
.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .about-contact__main .prose {
  margin: 0 0 20px;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-contact__list {
  margin: 0;
  padding: clamp(18px, 2.6vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--glass);
}

.page-about .about-contact__item + .about-contact__item {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-contact__item dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-contact__item dd {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-contact__item dd a {
  color: var(--paper);
  border-bottom: 1px solid rgba(56, 242, 208, 0.5);
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-contact__item dd a:hover,
.page-about .about-contact__item dd a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 侧栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-rail .toc {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.page-about .about-rail .toc__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-rail .toc__list li + li {
  margin-top: 2px;
}

.page-about .about-rail .toc__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: 2px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-about .about-rail .toc__link .toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--line-soft);
}

.page-about .about-rail .toc__link:hover,
.page-about .about-rail .toc__link:focus-visible {
  color: var(--paper);
  background: var(--glass);
}

.page-about .about-rail .toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--glass-strong);
}

.page-about .about-rail .toc__link[aria-current="true"] .toc__num {
  color: var(--cyan);
}

.page-about .about-rail__panel {
  padding: 20px;
}

.page-about .about-rail__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-rail__v {
  margin: 4px 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.25;
  color: var(--gold);
}

.page-about .about-rail__panel .about-rail__v:last-child {
  margin-bottom: 0;
}

.page-about .about-rail__links {
  display: grid;
  gap: 8px;
}

.page-about .about-rail__link {
  display: block;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--glass);
  transition: border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateX(3px);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-standards__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 20px;
  }

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

@media (min-width: 900px) {
  .page-about .about-masthead__grid {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: clamp(24px, 4vw, 56px);
    align-items: end;
  }

  .page-about .about-claim {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-develop__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
  }

  .page-about .about-contact__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    max-height: calc(100vh - var(--header-h) - 44px);
    overflow-y: auto;
    padding-right: 4px;
  }

  .page-about .about-standards__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-partner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 639px) {
  .page-about .about-masthead::after {
    display: none;
  }

  .page-about .about-timeline {
    padding-left: 28px;
  }

  .page-about .about-timeline__dot {
    left: -28px;
    width: 14px;
    height: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar__fill,
  .page-about .about-timeline__dot,
  .page-about .about-rail__link,
  .page-about .gloss::after {
    transition: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: none;
  }
}

.page-about {
  --w: 1rem;
}