/* ==================== 品牌介绍 page-about ==================== */
.page-about {
  --about-rule: rgba(10, 132, 255, .38);
  --about-hair: rgba(201, 212, 226, .22);
  --about-hair-ink: rgba(27, 34, 51, .12);
  background: var(--sd-frost);
  color: var(--sd-text);
  font-family: var(--sd-font-body);
}

.page-about .about-timeline,
.page-about .about-team,
.page-about .about-coverage,
.page-about .about-versions,
.page-about .about-local,
.page-about .about-rules {
  padding-block: clamp(2.6rem, 7vw, 5rem);
}

/* ---------- 排版件 ---------- */
.page-about .about-h2 {
  font-family: var(--sd-font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.6vw, 3rem);
  line-height: 1.08;
  letter-spacing: .005em;
  margin: 1.3rem 0 0;
  color: var(--sd-mist);
}
.page-about .about-h2--ink { color: var(--sd-text); }

.page-about .about-lede {
  max-width: 64ch;
  margin: 1rem 0 0;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(244, 247, 252, .78);
}
.page-about .about-lede--ink { color: var(--sd-text-soft); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--sd-ink);
  color: var(--sd-mist);
  padding: clamp(1.6rem, 4vw, 2.6rem) 0 clamp(3.2rem, 9vw, 5.6rem);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(62% 78% at 88% 6%, rgba(10, 132, 255, .30), transparent 66%),
    linear-gradient(116deg, transparent 41.6%, rgba(255, 107, 0, .16) 41.9%, transparent 42.6%);
}
.page-about .about-hero .sd-container { position: relative; z-index: 1; }

.page-about .about-hero .sd-crumbs { margin-bottom: clamp(1.4rem, 4vw, 2.4rem); }

.page-about .about-hero__kicker { margin: 0; }

.page-about .about-hero__title {
  font-family: var(--sd-font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.1vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -.005em;
  margin: .6rem 0 0;
  max-width: 19ch;
  color: #fff;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 1.1rem 0 0;
  font-size: 1.03rem;
  line-height: 1.8;
  color: rgba(244, 247, 252, .82);
}

.page-about .about-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2.2rem 0 0;
  padding: 0;
  background: rgba(201, 212, 226, .18);
  border-radius: var(--sd-radius-md);
  overflow: hidden;
}
.page-about .about-hero__stat {
  background: var(--sd-ink);
  padding: 1rem 1.05rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.page-about .about-hero__value {
  font-family: var(--sd-font-mono);
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--sd-orange);
}
.page-about .about-hero__label { color: var(--sd-silver); }

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 2.4rem 0 0;
  padding: 0 0 0 2.2rem;
  position: relative;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--sd-blue), rgba(10, 132, 255, .06));
}
.page-about .tl__item {
  position: relative;
  padding: 0 0 2.1rem;
  outline: none;
}
.page-about .tl__item:last-child { padding-bottom: 0; }
.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -2.2rem;
  top: .45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sd-obsidian);
  border: 2px solid var(--sd-blue);
}
.page-about .tl__item:focus-visible::before {
  box-shadow: 0 0 0 4px rgba(255, 209, 102, .45);
}
.page-about .tl__year {
  display: block;
  font-family: var(--sd-font-mono);
  font-size: 1.05rem;
  letter-spacing: .02em;
  color: var(--sd-blue);
}
.page-about .tl__title {
  font-family: var(--sd-font-display);
  font-size: 1.28rem;
  font-weight: 600;
  margin: .35rem 0 .5rem;
  color: #fff;
}
.page-about .tl__text {
  margin: 0;
  max-width: 66ch;
  font-size: .95rem;
  line-height: 1.78;
  color: rgba(244, 247, 252, .74);
}
.page-about .tl__note {
  margin: .7rem 0 0;
  max-width: 62ch;
  padding: .55rem .85rem;
  font-size: .83rem;
  line-height: 1.65;
  color: var(--sd-silver);
  background: rgba(10, 132, 255, .13);
  border-left: 2px solid var(--sd-blue);
  border-radius: 0 12px 12px 0;
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity .22s ease, transform .22s ease;
}
.page-about .tl__note-label {
  display: inline-block;
  margin-right: .5rem;
  font-family: var(--sd-font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--sd-orange);
}
.page-about .tl__item:hover .tl__note,
.page-about .tl__item:focus .tl__note,
.page-about .tl__item:focus-within .tl__note {
  opacity: 1;
  transform: none;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 1.8rem;
  align-items: center;
}
.page-about .about-team__media,
.page-about .about-local__media,
.page-about .about-versions__media { margin: 0; }

.page-about .sd-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--sd-radius-md);
}
.page-about .sd-media__cap {
  display: block;
  margin-top: .65rem;
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--sd-text-soft);
}

.page-about .roles {
  list-style: none;
  display: grid;
  gap: 1.5rem;
  margin: 2.4rem 0 0;
  padding: 0;
}
.page-about .role {
  padding-top: 1.1rem;
  border-top: 2px solid var(--sd-blue);
}
.page-about .role__no {
  display: block;
  color: var(--sd-text-soft);
}
.page-about .role__name {
  font-family: var(--sd-font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin: .45rem 0 .55rem;
  color: var(--sd-text);
}
.page-about .role__desc {
  margin: 0;
  font-size: .94rem;
  line-height: 1.76;
  color: var(--sd-text-soft);
}

/* ---------- 栏目切换 ---------- */
.page-about .cov { margin-top: 2.2rem; }
.page-about .cov__bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.page-about .cov__tab {
  font-family: var(--sd-font-body);
  font-size: .9rem;
  line-height: 1;
  padding: .68rem 1.15rem;
  border-radius: var(--sd-pill);
  border: 1px solid rgba(201, 212, 226, .32);
  background: transparent;
  color: var(--sd-mist);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.page-about .cov__tab:hover { border-color: var(--sd-blue); color: #fff; }
.page-about .cov__tab[aria-selected="true"] {
  background: var(--sd-orange);
  border-color: var(--sd-orange);
  color: var(--sd-ink);
  font-weight: 600;
}
.page-about .cov__tab:focus-visible {
  outline: 2px solid var(--sd-gold);
  outline-offset: 3px;
}

.page-about .cov__panels { margin-top: 1.6rem; }
.page-about .cov__panel {
  padding-top: 1.3rem;
  border-top: 1px solid var(--about-hair);
  outline: none;
}
.page-about .cov__panel:focus-visible { border-top-color: var(--sd-gold); }
.page-about .cov__panel[hidden] { display: none; }
.page-about .cov__title {
  font-family: var(--sd-font-display);
  font-size: 1.24rem;
  font-weight: 600;
  margin: 0 0 .9rem;
  color: #fff;
}
.page-about .cov__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .8rem;
}
.page-about .cov__points li {
  position: relative;
  padding-left: 1.3rem;
  font-size: .95rem;
  line-height: 1.76;
  color: rgba(244, 247, 252, .8);
}
.page-about .cov__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62rem;
  width: 8px;
  height: 2px;
  background: var(--sd-orange);
}

/* ---------- 版本演进 ---------- */
.page-about .ver {
  position: relative;
  margin: 2.2rem 0 0;
  padding-left: 1.7rem;
  display: grid;
  gap: 0;
}
.page-about .ver::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .55rem;
  bottom: .55rem;
  width: 2px;
  background: linear-gradient(180deg, var(--sd-gold), var(--sd-blue));
}
.page-about .ver__item {
  position: relative;
  padding: 0 0 1.5rem;
}
.page-about .ver__item:last-child { padding-bottom: 0; }
.page-about .ver__item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: .35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sd-violet);
  border: 2px solid var(--sd-blue);
}
.page-about .ver__item--now::before {
  background: var(--sd-orange);
  border-color: var(--sd-orange);
}
.page-about .ver__tag { display: block; color: var(--sd-silver); }
.page-about .ver__desc {
  margin: .4rem 0 0;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.76;
  color: rgba(244, 247, 252, .78);
}

.page-about .about-versions__media { margin-top: 2.2rem; }
.page-about .about-versions__media .sd-media__cap { color: rgba(201, 212, 226, .7); }

.page-about .about-versions__help {
  margin: 1.4rem 0 0;
  font-size: .92rem;
  line-height: 1.7;
  color: rgba(244, 247, 252, .72);
}
.page-about .about-versions__help a {
  color: var(--sd-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-versions__help a:hover { color: var(--sd-gold); }

/* ---------- 本地支持 ---------- */
.page-about .about-local__grid {
  display: grid;
  gap: 1.8rem;
  align-items: center;
}
.page-about .about-local__list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}
.page-about .about-local__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .95rem;
  line-height: 1.76;
  color: var(--sd-text-soft);
}
.page-about .about-local__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62rem;
  width: 9px;
  height: 2px;
  background: var(--sd-cyan);
}
.page-about .about-local__media .sd-media__cap { color: var(--sd-text-soft); }

/* ---------- 内容标准 ---------- */
.page-about .rules {
  list-style: none;
  margin: 2.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.9rem;
}
.page-about .rule {
  position: relative;
  padding-left: 3.2rem;
}
.page-about .rule__num {
  position: absolute;
  left: 0;
  top: -.1rem;
  font-family: var(--sd-font-mono);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--sd-orange);
}
.page-about .rule__title {
  font-family: var(--sd-font-display);
  font-size: 1.18rem;
  font-weight: 600;
  margin: 0 0 .5rem;
  color: #fff;
}
.page-about .rule__text {
  margin: 0;
  max-width: 58ch;
  font-size: .94rem;
  line-height: 1.78;
  color: rgba(244, 247, 252, .74);
}

/* ---------- 行动区 ---------- */
.page-about .about-next {
  background: var(--sd-frost);
  padding: clamp(2.2rem, 6vw, 3.6rem) 0 clamp(3rem, 8vw, 5rem);
}
.page-about .about-next::before {
  content: "";
  display: block;
  height: 3px;
  width: min(220px, 38%);
  margin: 0 auto clamp(1.6rem, 4vw, 2.4rem);
  background: var(--sd-orange);
  transform: skewX(-24deg);
}
.page-about .about-next__title {
  font-family: var(--sd-font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 4vw, 2.4rem);
  line-height: 1.1;
  margin: 0;
  color: var(--sd-text);
}
.page-about .about-next__text {
  max-width: 62ch;
  margin: .9rem 0 0;
  font-size: .98rem;
  line-height: 1.78;
  color: var(--sd-text-soft);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .roles { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem 2rem; }
  .page-about .rules { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem 2.6rem; }
  .page-about .about-hero__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-team__grid { grid-template-columns: 1.05fr .95fr; gap: 3rem; }
  .page-about .about-team__media { order: 2; }
  .page-about .about-local__grid { grid-template-columns: 1fr .9fr; gap: 3rem; }
  .page-about .tl { padding-left: 3rem; }
  .page-about .tl__item::before { left: -3rem; }
  .page-about .tl::before { left: 5px; }
  .page-about .ver { padding-left: 2.2rem; }
  .page-about .ver__item::before { left: -2.2rem; }
}

@media (hover: none) {
  .page-about .tl__note { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__note,
  .page-about .cov__tab { transition: none; }
  .page-about .tl__note { opacity: 1; transform: none; }
}
</main>