/* ============================================================
   品牌档案页 · page-about
   ============================================================ */

.page-about {
  --about-cut: 18px;
  --about-cut-sm: 12px;
  --about-line: rgba(11, 29, 58, 0.14);
  --about-line-soft: rgba(11, 29, 58, 0.08);
  --about-dim: rgba(26, 26, 26, 0.78);
  --about-dim-2: rgba(26, 26, 26, 0.58);

  background: var(--jade);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

.page-about .about-sec__head h2,
.page-about .about-team h3,
.page-about .about-tlmedia__h,
.page-about .about-cta h2 {
  font-weight: 700;
}

/* ---------- 首屏：框景 ---------- */

.page-about .about-hero {
  position: relative;
  background: linear-gradient(180deg, var(--night) 0%, var(--night-deep) 100%);
  color: var(--jade);
  padding: calc(var(--bar-h) + 22px) 0 0;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--red) 0%,
    var(--red) 26%,
    var(--gold) 26%,
    var(--gold) 100%
  );
}

.page-about .about-hero__crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(247, 245, 240, 0.58);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.page-about .about-hero__crumbs a {
  color: rgba(247, 245, 240, 0.78);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover,
.page-about .about-hero__crumbs a:focus-visible {
  color: var(--gold-soft);
}

.page-about .about-hero__crumbs .crumbs__sep {
  color: rgba(212, 160, 23, 0.7);
}

.page-about .about-hero__crumbs [aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid rgba(212, 160, 23, 0.38);
  background: rgba(6, 15, 31, 0.5);
  padding: clamp(22px, 3.8vw, 42px);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    0 100%
  );
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(212, 160, 23, 0.55) 0 1px,
    transparent 1px 22px
  );
  pointer-events: none;
}

.page-about .about-hero__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 6px 0 clamp(16px, 2.6vw, 26px);
}

.page-about .about-hero__top .eyebrow {
  color: var(--gold-soft);
  margin: 0;
}

.page-about .about-hero h1 {
  font-size: clamp(2.1rem, 7.4vw, 4.4rem);
  color: var(--jade);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.5vw, 1.2rem);
  line-height: 1.9;
  color: rgba(247, 245, 240, 0.84);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: clamp(16px, 2.2vw, 20px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  border-top: 1px solid rgba(212, 160, 23, 0.28);
}

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

.page-about .about-hero__k {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(247, 245, 240, 0.55);
}

.page-about .about-hero__v {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--gold-soft);
}

.page-about .about-hero__media {
  margin: clamp(28px, 5vw, 58px) 0 0;
  padding: 0;
  background: var(--night-deep);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 36px),
    calc(100% - 36px) 100%,
    0 100%
  );
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  background: var(--jade);
  padding: clamp(42px, 7vw, 92px) 0 clamp(48px, 7vw, 96px);
}

.page-about .grid--rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
}

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

/* ---------- 左侧刻度导航 ---------- */

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--red);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: var(--fs-14);
  color: var(--night);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .about-rail__scale {
  display: none;
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  scroll-margin-top: calc(var(--bar-h) + 24px);
  padding-top: clamp(34px, 5vw, 62px);
  min-width: 0;
}

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

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec__head {
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-sec__head .eyebrow {
  margin: 0 0 8px;
  color: var(--red);
}

.page-about .about-sec__head h2 {
  font-size: clamp(1.42rem, 3.6vw, 2.3rem);
  color: var(--night);
  max-width: 26ch;
}

.page-about .about-sec .prose p {
  margin: 0 0 1.1em;
  font-size: var(--fs-16);
  line-height: 1.9;
  color: var(--about-dim);
}

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

.page-about .about-sec .prose .lede {
  font-size: clamp(1.02rem, 1.7vw, 1.22rem);
  line-height: 1.85;
  color: var(--night);
}

.page-about .about-flow a {
  color: var(--red-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 16, 46, 0.35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-flow a:hover,
.page-about .about-flow a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .about-inline {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 14px 16px;
  background: var(--sand);
  border-left: 3px solid var(--gold);
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 数字块 ---------- */

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--jade);
}

.page-about .about-stats .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-stats .stat__key {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--about-dim-2);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 34px);
}

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

.page-about .about-team h3 {
  font-size: clamp(1.06rem, 1.9vw, 1.32rem);
  color: var(--night);
  margin: 0 0 12px;
}

.page-about .about-team p {
  margin: 0 0 0.9em;
  font-size: var(--fs-14);
  line-height: 1.88;
  color: var(--about-dim);
}

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

.page-about .about-team__media {
  margin: 0;
  background: var(--sand);
  clip-path: polygon(
    0 0,
    calc(100% - 22px) 0,
    100% 22px,
    100% 100%,
    0 100%
  );
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 版本号主展示 ---------- */

.page-about .about-numbox {
  margin-top: clamp(22px, 3.4vw, 34px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--night);
  color: var(--jade);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
  clip-path: polygon(
    0 0,
    calc(100% - 24px) 0,
    100% 24px,
    100% 100%,
    0 100%
  );
}

.page-about .about-numbox__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-numbox__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--jade);
}

.page-about .about-numbox__note {
  margin: 0;
  flex: 1 1 200px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: rgba(247, 245, 240, 0.7);
}

/* ---------- 新旧版本对照 ---------- */

.page-about .about-vergrid {
  margin-top: clamp(18px, 2.8vw, 26px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-vergrid .panel {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--jade);
  border: 1px solid var(--about-line);
  clip-path: polygon(
    0 0,
    calc(100% - 18px) 0,
    100% 18px,
    100% 100%,
    0 100%
  );
}

.page-about .about-vergrid .tag {
  margin: 0;
}

.page-about .about-vergrid .panel h3 {
  font-family: var(--font-mono);
  font-size: clamp(1.02rem, 1.8vw, 1.24rem);
  font-weight: 700;
  color: var(--night);
  margin: 12px 0 10px;
  letter-spacing: 0;
}

.page-about .about-vergrid .panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--red) 0%, var(--gold) 100%);
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(10px, 1.8vw, 16px);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 15px;
  width: 12px;
  height: 12px;
  background: var(--jade);
  border: 2px solid var(--red);
  transform: rotate(45deg);
}

.page-about .about-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 10px 12px;
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-node summary:hover {
  background: rgba(200, 16, 46, 0.05);
  border-color: rgba(200, 16, 46, 0.2);
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-node[open] summary {
  background: rgba(212, 160, 23, 0.12);
  border-color: rgba(212, 160, 23, 0.42);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .about-node__title {
  flex: 1 1 180px;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(0.98rem, 1.8vw, 1.18rem);
  color: var(--night);
  line-height: 1.4;
}

.page-about .about-node__more {
  align-self: center;
  margin-left: auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease);
}

.page-about .about-node[open] .about-node__more {
  transform: rotate(225deg);
}

.page-about .about-node__body {
  padding: 4px 12px 14px;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 时间轴配图 ---------- */

.page-about .about-tlmedia {
  margin: clamp(26px, 4vw, 42px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
  align-items: center;
}

.page-about .about-tlmedia__h {
  font-size: clamp(1.06rem, 1.9vw, 1.3rem);
  color: var(--night);
  margin: 0 0 12px;
}

.page-about .about-tlmedia p {
  margin: 0 0 0.9em;
  font-size: var(--fs-14);
  line-height: 1.88;
  color: var(--about-dim);
}

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

.page-about .about-tlmedia figure {
  margin: 0;
  background: var(--sand);
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    0 100%
  );
}

.page-about .about-tlmedia img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---------- 归档三项 ---------- */

.page-about .about-archive {
  margin-top: clamp(24px, 3.6vw, 36px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
}

.page-about .about-archive__item {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--jade);
}

.page-about .about-archive__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-archive__v {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  line-height: 1.1;
  color: var(--night);
}

.page-about .about-archive__d {
  margin: 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--about-dim-2);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--sand);
  border-top: 1px solid var(--about-line);
  padding: clamp(40px, 6vw, 72px) 0;
}

.page-about .about-cta__inner {
  max-width: 720px;
}

.page-about .about-cta h2 {
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  color: var(--night);
  margin: 0 0 14px;
}

.page-about .about-cta p {
  margin: 0 0 26px;
  font-size: var(--fs-16);
  line-height: 1.88;
  color: var(--about-dim);
}

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

/* ============================================================
   断点
   ============================================================ */

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-archive {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-tlmedia {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 940px) {
  .page-about .grid--rail {
    grid-template-columns: minmax(190px, 236px) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-rail__list a {
    display: flex;
    width: 100%;
    padding: 11px 0;
    border-bottom: 1px solid var(--about-line-soft);
    border-left: 2px solid transparent;
    padding-left: 12px;
    margin-left: -12px;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
      background 0.2s var(--ease);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-bottom-color: var(--about-line);
    border-left-color: var(--red);
    background: rgba(200, 16, 46, 0.05);
  }

  .page-about .about-rail__scale {
    display: flex;
    justify-content: space-between;
    gap: 4px;
    margin-top: 28px;
    padding-top: 14px;
    border-top: 1px solid var(--about-line);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: rgba(26, 26, 26, 0.42);
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-node::before {
    left: -34px;
  }

  .page-about .about-node summary {
    padding: 12px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__more,
  .page-about .about-rail__list a {
    transition: none;
  }
}