/* ===== 主场介绍 /introduction/ ===== */

.page-about {
  --about-radius: 6px 28px 6px 28px;
  --about-radius-sm: 6px 18px 6px 18px;
  display: block;
  padding-bottom: 72px;
  color: var(--chalk);
}

/* --- 面包屑 --- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--comment);
}
.page-about .about-crumb a {
  color: var(--comment);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .about-crumb a:hover { color: var(--lamp); }
.page-about .about-crumb [aria-current="page"] { color: var(--chalk); }

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 52px;
  background:
    radial-gradient(115% 82% at 88% -12%, rgba(46, 125, 87, .34), transparent 62%),
    linear-gradient(180deg, var(--stand), var(--ink) 78%);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -150px;
  top: -90px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  border: 1px solid rgba(255, 210, 74, .16);
  box-shadow:
    0 0 0 56px rgba(46, 125, 87, .07),
    0 0 0 124px rgba(46, 125, 87, .04);
  pointer-events: none;
  opacity: 0;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 8.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--chalk);
  max-width: 19ch;
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--comment);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-fig {
  background: var(--panel);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-fig__val {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--lamp);
}
.page-about .about-fig__key {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--comment);
  letter-spacing: .04em;
}

/* --- 章节骨架 --- */
.page-about .about-block {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.page-about .section__head {
  max-width: 620px;
  margin: 0 0 32px;
}
.page-about .section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--chalk);
}
.page-about .lede {
  margin: 14px 0 0;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--comment);
}
.page-about .about-more {
  margin: 26px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--comment);
}
.page-about .about-more a {
  color: var(--lamp);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 74, .38);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-more a:hover {
  color: var(--glow);
  border-color: var(--glow);
}

/* --- 图片容器 --- */
.page-about .about-shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}
.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.88) brightness(.86);
}
.page-about .about-shot::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 19, 15, 0) 48%, rgba(7, 19, 15, .78));
  pointer-events: none;
}
.page-about .about-shot__cap {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 14px;
  z-index: 1;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--glow);
}
.page-about .about-shot--wide { margin-bottom: 28px; }

/* --- 标签页 --- */
.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-tabs .tab {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13.5px;
  letter-spacing: .04em;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--stand);
  color: var(--comment);
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.page-about .about-tabs .tab:hover {
  color: var(--chalk);
  border-color: var(--turf);
}
.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--lamp);
  border-color: var(--lamp);
  color: var(--ink);
  font-weight: 600;
}
.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--glow);
  outline-offset: 2px;
}
.page-about .about-tabs .tabpanel {
  margin-top: 22px;
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  animation: about-fade 220ms var(--ease);
}
.page-about .about-tabs .tabpanel[hidden] { display: none; }

@keyframes about-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .about-roles > li {
  padding-left: 16px;
  border-left: 2px solid var(--turf);
}
.page-about .about-roles__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--lamp);
}
.page-about .about-roles__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--chalk);
}

/* --- 02 数据来源 --- */
.page-about .about-source__grid {
  display: grid;
  gap: 30px;
}
.page-about .about-source__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}
.page-about .about-source__list li {
  padding: 15px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--comment);
}
.page-about .about-source__list li:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-source__list b {
  color: var(--chalk);
  font-weight: 600;
}

/* --- 03 覆盖范围色带 --- */
.page-about .about-band {
  position: relative;
  margin-top: 8px;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-band > img {
  display: block;
  width: 100%;
  height: 340px;
  object-fit: cover;
  filter: saturate(.7) brightness(.7);
}
.page-about .about-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 19, 15, .62), rgba(7, 19, 15, .9));
  pointer-events: none;
}
.page-about .about-band__inner {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
}
.page-about .about-band__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}
.page-about .about-band__stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-band__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 7vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lamp);
}
.page-about .about-band__unit {
  font-size: .5em;
  margin-left: 3px;
  color: var(--glow);
}
.page-about .about-band__key {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--chalk);
}

/* --- 04 版本阶梯 --- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
  display: grid;
  gap: 20px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--turf), var(--line));
}
.page-about .about-timeline__item {
  position: relative;
  padding: 20px 18px;
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--about-radius-sm);
  transition:
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-timeline__item[data-visible] {
  border-color: var(--turf);
  background: var(--panel);
}
.page-about .about-timeline__item[data-visible]::before {
  border-color: var(--lamp);
  background: var(--lamp);
}
.page-about .about-timeline__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--lamp);
}
.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}
.page-about .about-timeline__what {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--comment);
}
.page-about .about-timeline__why {
  margin: 8px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--turf);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--glow);
}

/* --- 05 使用人群 --- */
.page-about .about-audience__grid {
  display: grid;
  gap: 16px;
}
.page-about .about-audience__card {
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--about-radius-sm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-audience__card:hover {
  border-color: var(--turf);
  transform: translateY(-2px);
}
.page-about .about-audience__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--comment);
}
.page-about .about-audience__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--lamp);
}
.page-about .about-audience__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--chalk);
}

/* --- 06 同行 --- */
.page-about .about-partner__grid {
  display: grid;
  gap: 34px;
}
.page-about .about-partner__cta {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-partner__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-partner__facts li {
  background: var(--stand);
  padding: 20px 18px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.page-about .about-partner__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--lamp);
}
.page-about .about-partner__txt {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--chalk);
}

/* --- 断点 --- */
@media (min-width: 640px) {
  .page-about .about-block { padding: 72px 0; }
  .page-about .about-audience__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
  .page-about .about-band > img { height: 400px; }
  .page-about .about-band__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
  .page-about .about-shot--wide { margin-bottom: 34px; }
  .page-about .about-roles { gap: 24px; }
}

@media (min-width: 900px) {
  .page-about { padding-bottom: 96px; }
  .page-about .about-hero { padding: 34px 0 76px; }
  .page-about .about-hero::after { opacity: 1; }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
    gap: 56px;
  }
  .page-about .about-hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-fig { padding: 22px 20px; }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-source__list { margin-top: 28px; }

  .page-about .about-tabs .tabpanel { padding: 28px 26px; }

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-timeline { gap: 22px; padding-left: 26px; }
  .page-about .about-timeline__item { padding: 24px 26px; }
  .page-about .about-timeline__item::before { left: -26px; }
}

@media (min-width: 1100px) {
  .page-about .about-hero h1 { max-width: 17ch; }
  .page-about .about-band > img { height: 460px; }
  .page-about .about-band__num { font-size: 42px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-audience__card,
  .page-about .about-tabs .tabpanel {
    animation: none;
    transition: none;
  }
}
</final>