/* ===== 品牌使命 · 页面专属样式（作用域 page-about） ===== */

.page-about {
  --about-rail: 216px;
  position: relative;
  padding-top: clamp(8px, 2vw, 20px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏：左窄右宽，图片贴底 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.5vw, 44px);
  padding-block: clamp(20px, 4vw, 40px) clamp(28px, 5vw, 56px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10px 0 auto 0;
  height: 68%;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-panel);
  box-shadow: var(--glow);
}

.page-about .about-hero__media .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 340px;
  object-fit: cover;
}

.page-about .about-hero__text {
  position: relative;
}

.page-about .about-hero__text .lede {
  max-width: 40ch;
  margin-top: 16px;
}

.page-about .about-hero__note {
  max-width: 42ch;
  margin: 16px 0 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-hero__tags {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, .42fr) minmax(0, .58fr);
    align-items: end;
  }
  .page-about .about-hero__media .media-frame__img {
    max-height: 500px;
  }
  .page-about .about-hero__text {
    padding-bottom: clamp(4px, 1.5vw, 18px);
  }
}

/* ---------- 主体：左侧竖线目录 + 右侧章节 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-rail__label {
  margin: 0 0 14px;
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-about .about-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .rail-node {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  color: var(--c-muted);
  text-decoration: none;
  font-size: .875rem;
  line-height: 1.5;
  transition: color .22s ease;
}

.page-about .rail-node__dot {
  position: absolute;
  left: -20px;
  top: 15px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-night);
  border: 1px solid var(--line);
  transition: border-color .22s ease, background .22s ease, box-shadow .22s ease;
}

.page-about .rail-node__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--c-muted);
  letter-spacing: .04em;
}

.page-about .rail-node__name {
  flex: 1;
}

.page-about .rail-node:hover,
.page-about .rail-node:focus-visible {
  color: var(--c-neon-soft);
}

.page-about .rail-node:hover .rail-node__dot,
.page-about .rail-node:focus-visible .rail-node__dot {
  border-color: var(--c-neon);
  background: var(--c-neon);
  box-shadow: 0 0 0 4px rgba(79, 227, 193, .16);
}

.page-about .rail-node:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 4px;
  border-radius: 4px;
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

/* ---------- 章节节奏 ---------- */

.page-about .about-section {
  padding-top: clamp(30px, 5vw, 54px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-section .section-head {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-lead {
  margin: 0 0 clamp(18px, 2.5vw, 26px);
  padding-left: 16px;
  border-left: 2px solid var(--c-neon);
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-footnote {
  margin: 20px 0 0;
  color: var(--c-muted);
}

/* ---------- 使命陈述：正文 + 旁注 ---------- */

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-cols .prose p {
  max-width: 42ch;
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-aside {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-panel);
  padding: 20px 22px 22px;
}

.page-about .about-aside__title {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--c-muted);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-neon-soft);
}

.page-about .about-stat__label {
  font-size: .8125rem;
  color: var(--c-muted);
}

/* ---------- 团队：堆叠条形图 + 分工卡 ---------- */

.page-about .crew-bar {
  display: flex;
  height: 14px;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--c-float);
}

.page-about .crew-seg {
  display: block;
  height: 100%;
}

.page-about .crew-seg--edit {
  flex: 5;
  background: var(--c-neon);
}

.page-about .crew-seg--check {
  flex: 4;
  background: var(--c-neon-soft);
  opacity: .72;
}

.page-about .crew-seg--ui {
  flex: 3;
  background: var(--c-gold);
}

.page-about .crew-seg--support {
  flex: 2;
  background: var(--c-muted);
  opacity: .75;
}

.page-about .crew-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 620px) {
  .page-about .crew-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .crew-legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .crew-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 18px 20px 20px;
  background: var(--c-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-within {
  border-color: rgba(79, 227, 193, .45);
  background: var(--c-float);
  transform: translateY(-2px);
}

.page-about .crew-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .crew-card__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-text);
}

.page-about .crew-card__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 版本演进线 ---------- */

.page-about .version-track {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-about .version-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .version-node {
  position: relative;
  background: var(--c-panel);
  padding: 26px 22px 24px;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 36px;
  height: 2px;
  background: var(--c-neon);
}

.page-about .version-node__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-neon-soft);
}

.page-about .version-node__title {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--c-text);
}

.page-about .version-node__desc {
  margin: 0 0 16px;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-about .version-node__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--c-neon);
}

/* ---------- 校验流程 ---------- */

.page-about .check-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

@media (min-width: 940px) {
  .page-about .check-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .check-list {
  display: block;
}

.page-about .check-item {
  background: var(--c-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color .25s ease, background .25s ease;
}

.page-about .check-item[data-open] {
  border-color: rgba(79, 227, 193, .38);
  background: var(--c-float);
}

.page-about .check-item__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 18px;
  background: transparent;
  border: 0;
  color: var(--c-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background .22s ease;
}

.page-about .check-item__head:hover {
  background: var(--c-float);
}

.page-about .check-item__head:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: -2px;
}

.page-about .check-item__index {
  font-family: var(--font-mono);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-gold);
}

.page-about .check-item__title {
  flex: 1;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .01em;
}

.page-about .check-item .rule-item__content {
  padding: 0 18px 20px 18px;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .check-item .rule-item__content ul {
  margin: 12px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.page-about .check-item .rule-item__content li::marker {
  color: var(--c-neon);
}

/* ---------- 更新节律 ---------- */

.page-about .rhythm-grid {
  list-style: none;
  margin: 0 0 clamp(26px, 3.5vw, 38px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 700px) {
  .page-about .rhythm-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .rhythm-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 20px;
  background: var(--c-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .rhythm-card__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--c-gold);
}

.page-about .rhythm-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

@media (min-width: 880px) {
  .page-about .eco {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .eco__text h3 {
  margin: 0 0 12px;
}

.page-about .eco__text p {
  margin: 0 0 12px;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--c-muted);
}

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

.page-about .eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .eco__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  background: var(--c-panel);
  padding: 14px 18px;
  font-size: .9375rem;
  color: var(--c-muted);
}

.page-about .eco__list .num {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-gold);
  min-width: 3.2ch;
  text-align: right;
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  margin-top: clamp(40px, 6vw, 68px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .next-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 680px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .next-card a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 20px;
  background: var(--c-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--c-text);
  transition: border-color .25s ease, background .25s ease, transform .25s ease;
}

.page-about .next-card a:hover,
.page-about .next-card a:focus-visible {
  border-color: rgba(79, 227, 193, .5);
  background: var(--c-float);
  transform: translateY(-2px);
}

.page-about .next-card a:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
}

.page-about .next-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .next-card__desc {
  flex: 1;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .next-card__arrow {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--c-neon);
  transition: transform .25s ease;
}

.page-about .next-card a:hover .next-card__arrow {
  transform: translateX(4px);
}

/* ---------- 图片容器 ---------- */

.page-about .about-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-panel);
}

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

.page-about .about-media .media-frame__caption {
  padding: 12px 18px 16px;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--c-muted);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 滚动显现 ---------- */

.page-about .js-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s ease, transform .5s ease;
}

.page-about .js-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .js-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .page-about .crew-card,
  .page-about .next-card a,
  .page-about .next-card__arrow {
    transition: none !important;
  }
  .page-about .crew-card:hover,
  .page-about .next-card a:hover {
    transform: none;
  }
}
</main>