/* ===== 品牌介绍 · page-about ===== */

.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(18px, 2.6vw, 30px) 0 clamp(38px, 6vw, 76px);
  background:
    radial-gradient(92% 72% at 84% 4%, rgba(224, 177, 92, 0.13), transparent 64%),
    radial-gradient(72% 62% at 2% 0%, rgba(216, 65, 47, 0.15), transparent 66%);
}

.page-about .crumbs {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  padding: 7px 16px 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(19, 41, 63, 0.72);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .ab-kicker::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(62, 158, 143, 0.16);
}

.page-about h1 {
  margin: 0 0 clamp(16px, 2vw, 24px);
  max-width: 15em;
  font-size: clamp(34px, 6.2vw, 64px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--paper);
}

.page-about .ab-hero__say {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: #cfd7de;
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin: 0;
  padding: clamp(18px, 2.4vw, 24px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .ab-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-facts__n {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .ab-facts__t {
  font-size: 13px;
  line-height: 1.55;
  color: var(--grey);
}

.page-about .ab-hero__media .media {
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media--tall img {
  aspect-ratio: 3 / 2;
}

/* ---------- 主体分栏 ---------- */

.page-about .ab-body {
  padding: clamp(28px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
  border-top: 1px solid rgba(42, 74, 107, 0.55);
}

.page-about .ab-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-rail__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grey);
  text-transform: uppercase;
}

.page-about .ab-nav {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  list-style: none;
  scrollbar-width: none;
}

.page-about .ab-nav::-webkit-scrollbar {
  display: none;
}

.page-about .ab-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--grey);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ea), border-color 0.2s var(--ea), background 0.2s var(--ea);
}

.page-about .ab-nav a:hover,
.page-about .ab-nav a:focus-visible {
  color: var(--paper);
  border-color: var(--gold);
  background: rgba(224, 177, 92, 0.08);
}

/* ---------- 正文区块 ---------- */

.page-about .ab-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 6vw, 76px);
  min-width: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2vw, 22px);
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(42, 74, 107, 0.6);
}

.page-about .ab-sec__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--acc);
}

.page-about .ab-sec h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-sec__body {
  max-width: 46em;
}

.page-about .ab-sec__body > p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.78;
  color: #cfd7de;
}

.page-about .ab-sec__body > p:last-child {
  margin-bottom: 0;
}

.page-about .lead {
  font-size: clamp(17px, 1.9vw, 19px);
  line-height: 1.72;
  color: var(--paper);
}

.page-about .ab-grid2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-grid2 p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: #cfd7de;
}

.page-about .ab-grid2 > div {
  padding-left: 18px;
  border-left: 2px solid rgba(42, 74, 107, 0.9);
}

.page-about .ab-grid2 > div:first-child {
  border-left-color: var(--gold);
}

/* 图片容器 */

.page-about .ab-team__figure,
.page-about .ab-flow__figure {
  margin: clamp(22px, 3vw, 32px) 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .media__cap {
  margin: 0;
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
  border-top: 1px solid rgba(42, 74, 107, 0.7);
}

/* 团队折叠行 */

.page-about .ab-team {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .ab-team__row {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(19, 41, 63, 0.6);
  overflow: hidden;
  transition: border-color 0.24s var(--ea), background 0.24s var(--ea);
}

.page-about .ab-team__row[open] {
  border-color: rgba(224, 177, 92, 0.55);
  background: rgba(19, 41, 63, 0.92);
}

.page-about .ab-team__row summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-team__row summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-team__row summary::after {
  content: "＋";
  flex: 0 0 auto;
  font-size: 15px;
  color: var(--gold);
  transition: transform 0.24s var(--ea);
}

.page-about .ab-team__row[open] summary::after {
  transform: rotate(45deg);
}

.page-about .ab-team__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-team__n {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
}

.page-about .ab-team__row p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--grey);
}

/* 流程步骤 */

.page-about .ab-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: abstep;
}

.page-about .ab-steps__item {
  position: relative;
  padding: 18px 20px 18px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(19, 41, 63, 0.5);
  transition: border-color 0.24s var(--ea), background 0.24s var(--ea), transform 0.24s var(--ea);
}

.page-about .ab-steps__item:hover,
.page-about .ab-steps__item:focus-within {
  border-left-color: var(--gold);
  background: rgba(19, 41, 63, 0.92);
  transform: translateY(-2px);
}

.page-about .ab-steps__n {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--acc);
}

.page-about .ab-steps__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-steps__item p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.72;
  color: #b9c4ce;
}

.page-about .ab-steps__out {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(42, 74, 107, 0.9);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gold);
}

/* 版本时间轴 */

.page-about .ab-tl {
  position: relative;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(216, 65, 47, 0.8) 68%, rgba(42, 74, 107, 0.5) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: clamp(20px, 2.8vw, 30px);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
}

.page-about .ab-tl__item:last-child::before {
  background: var(--acc);
  border-color: var(--acc);
}

.page-about .ab-tl__ver {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .ab-tl__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: #b9c4ce;
}

/* 覆盖与节奏数字 */

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .ab-figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(19, 41, 63, 0.92), rgba(11, 27, 43, 0.7));
}

.page-about .ab-figure__n {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .ab-figure__t {
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-figure p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  padding: 0 0 clamp(40px, 6vw, 80px);
}

.page-about .ab-cta__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 3.6vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(90% 130% at 88% 0%, rgba(216, 65, 47, 0.16), transparent 62%),
    var(--ink-2);
}

.page-about .ab-cta__text h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 2.8vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-cta__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: #b9c4ce;
}

.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 980px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(30px, 4.4vw, 64px);
  }

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

  .page-about .ab-facts li {
    padding: 0 18px;
    border-left: 1px solid rgba(42, 74, 107, 0.75);
  }

  .page-about .ab-facts li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .ab-body__grid {
    grid-template-columns: minmax(180px, 3fr) minmax(0, 9fr);
    gap: clamp(34px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--head-h) + 30px);
    align-self: start;
  }

  .page-about .ab-nav {
    flex-direction: column;
    gap: 2px;
    padding-left: 24px;
    overflow: visible;
  }

  .page-about .ab-nav::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, rgba(224, 177, 92, 0.6), rgba(42, 74, 107, 0.45));
  }

  .page-about .ab-nav li {
    position: relative;
    list-style: none;
  }

  .page-about .ab-nav {
    position: relative;
  }

  .page-about .ab-nav a {
    padding: 9px 10px;
    border: 0;
    border-radius: 10px;
  }

  .page-about .ab-nav a::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 50%;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line);
    transform: translate(-50%, -50%);
    transition: background 0.2s var(--ea), box-shadow 0.2s var(--ea);
  }

  .page-about .ab-nav a:hover::before,
  .page-about .ab-nav a:focus-visible::before {
    background: var(--gold);
    box-shadow: 0 0 0 4px rgba(224, 177, 92, 0.18);
  }

  .page-about .ab-grid2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .ab-cta__acts {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-sec__body {
    max-width: 48em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-nav a,
  .page-about .ab-team__row,
  .page-about .ab-steps__item,
  .page-about .ab-nav a::before {
    transition: none;
  }

  .page-about .ab-steps__item:hover,
  .page-about .ab-steps__item:focus-within {
    transform: none;
  }
}