.page-about {
  --about-rail-w: 176px;
  --about-glass: rgba(220, 231, 242, .08);
  --about-glass-line: rgba(220, 231, 242, .2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(2.25rem, 5.5vw, 4rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  color: var(--on-dark);
  background:
    radial-gradient(118% 88% at 84% 6%, rgba(46, 139, 122, .3) 0%, transparent 58%),
    radial-gradient(90% 70% at 4% 96%, rgba(242, 169, 0, .14) 0%, transparent 60%),
    linear-gradient(164deg, #071A33 0%, #0B2545 58%, #123A63 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(220, 231, 242, .05) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(90deg, rgba(220, 231, 242, .035) 0 1px, transparent 1px 92px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

/* 左侧档案索引 */
.page-about .about-rail {
  min-width: 0;
  padding-top: .85rem;
  border-top: 1px solid rgba(242, 169, 0, .42);
}

.page-about .about-rail__label {
  margin: 0 0 .7rem;
  font-size: .7rem;
  letter-spacing: .34em;
  color: var(--amber);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .5rem;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .34rem .6rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  color: rgba(220, 231, 242, .72);
  text-decoration: none;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-rail__list a::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(220, 231, 242, .38);
  transition: background-color .2s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: rgba(242, 169, 0, .16);
  border-color: rgba(242, 169, 0, .48);
  color: #fff;
}

.page-about .about-rail__list a:hover::before,
.page-about .about-rail__list a:focus-visible::before {
  background: var(--amber);
}

/* 主标题区 */
.page-about .about-hero__lead {
  min-width: 0;
}

.page-about .about-hero__crumb {
  margin-bottom: 1.1rem;
  color: rgba(220, 231, 242, .62);
}

.page-about .about-hero__crumb a {
  color: rgba(220, 231, 242, .78);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0 0 1.1rem;
  font-size: clamp(2rem, 7.2vw, 4rem);
  line-height: 1.05;
  letter-spacing: -.018em;
  font-weight: 800;
  color: #fff;
}

.page-about .about-hero__accent {
  display: inline-block;
  color: var(--amber);
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin: 0 0 1.6rem;
  font-size: clamp(.96rem, 2.1vw, 1.06rem);
  line-height: 1.88;
  color: var(--on-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-bottom: 2rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--about-glass-line);
  border-radius: var(--radius);
  background: var(--about-glass-line);
  overflow: hidden;
}

.page-about .about-hero__facts > div {
  padding: .85rem 1rem;
  background: rgba(7, 26, 51, .62);
}

.page-about .about-hero__facts dt {
  margin: 0 0 .28rem;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--amber-soft);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: .9rem;
  color: #fff;
}

.page-about .about-hero__media {
  margin: clamp(1.9rem, 4.5vw, 2.9rem) 0 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 330px;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-hero__media .figure-frame__caption {
  color: rgba(220, 231, 242, .66);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(2.4rem, 5.5vw, 4.25rem) 0;
  overflow: hidden;
}

.page-about .about-section--paper {
  background: var(--paper);
}

.page-about .about-section--mist {
  background: linear-gradient(180deg, var(--mist) 0%, #E7EFF7 100%);
}

.page-about .about-section__head {
  max-width: 64ch;
  margin-bottom: clamp(1.5rem, 3.4vw, 2.4rem);
}

.page-about .about-section__head h2 {
  margin: 0 0 .65rem;
  font-size: clamp(1.4rem, 3.5vw, 2.1rem);
  line-height: 1.26;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--navy);
}

.page-about .about-section__head p:not(.eyebrow) {
  margin: 0;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-origin__body p {
  margin: 0 0 1.1rem;
}

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

.page-about .about-origin__aside {
  align-self: start;
  border-top: 4px solid var(--celadon);
}

.page-about .about-origin__aside-title {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-origin__facts {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-about .about-origin__facts li {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding-bottom: .5rem;
  border-bottom: 1px dashed var(--line);
  font-size: .92rem;
  color: var(--ink-soft);
}

.page-about .about-origin__facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-origin__num {
  min-width: 2.6rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--steel);
}

.page-about .about-origin__aside-note {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 02 结构 ---------- */
.page-about .about-cats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .cat-card {
  position: relative;
  padding: 1.35rem 1.25rem 1.4rem;
  background: #fff;
  border: 1px solid var(--line);
  border-top-width: 4px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease;
}

.page-about .cat-card:hover,
.page-about .cat-card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.page-about .cat-card--notice {
  border-top-color: var(--vermilion);
}

.page-about .cat-card--guide {
  border-top-color: var(--celadon);
}

.page-about .cat-card--archive {
  border-top-color: var(--navy);
}

.page-about .cat-card__tag {
  margin: 0 0 .6rem;
  font-size: .74rem;
  letter-spacing: .22em;
  font-weight: 700;
}

.page-about .cat-card--notice .cat-card__tag {
  color: var(--vermilion);
}

.page-about .cat-card--guide .cat-card__tag {
  color: var(--celadon);
}

.page-about .cat-card--archive .cat-card__tag {
  color: var(--navy);
}

.page-about .cat-card h3 {
  margin: 0 0 .6rem;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
}

.page-about .cat-card p {
  margin: 0 0 .9rem;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .cat-card__meta {
  margin: 0;
  padding-top: .7rem;
  border-top: 1px solid var(--line);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

.page-about .about-structure__figure {
  margin: clamp(1.6rem, 3.5vw, 2.4rem) 0 0;
}

.page-about .about-structure__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* ---------- 03 版本时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.1rem, 2.8vw, 1.6rem) 2.1rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: .38rem;
  top: 1.3rem;
  bottom: -.1rem;
  width: 2px;
  background: var(--line);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: .9rem;
  width: .78rem;
  height: .78rem;
  border-radius: 50%;
  background: var(--steel);
  box-sizing: content-box;
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--line-strong);
}

.page-about .about-timeline__item--current .about-timeline__marker {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(242, 169, 0, .28);
}

.page-about .about-card {
  padding: 1.1rem 1.2rem 1.2rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-2);
}

.page-about .about-timeline__item--current .about-card {
  border-left: 4px solid var(--amber);
}

.page-about .about-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  margin-bottom: .7rem;
}

.page-about .about-card__when {
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--ink-soft);
}

.page-about .about-card h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
}

.page-about .about-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 04 山东本地化 ---------- */
.page-about .about-shandong {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-shandong__body p {
  margin: 0 0 1.05rem;
}

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

.page-about .about-shandong__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
  align-content: start;
}

.page-about .about-shandong__list li {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .8rem .95rem;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--celadon);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-shandong__num {
  flex: none;
  font-weight: 700;
  color: var(--celadon);
  letter-spacing: .02em;
}

.page-about .about-shandong__figure {
  margin: clamp(1.6rem, 3.5vw, 2.4rem) 0 0;
}

.page-about .about-shandong__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* ---------- 05 团队 ---------- */
.page-about .about-section .watermark {
  position: absolute;
  right: clamp(.5rem, 3vw, 3rem);
  top: clamp(.5rem, 2vw, 1.4rem);
  font-family: var(--font-mono);
  font-size: clamp(4rem, 14vw, 9rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(11, 37, 69, .055);
  pointer-events: none;
  user-select: none;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.35rem 1.25rem 1.4rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: var(--celadon-soft);
}

.page-about .team-card__no {
  margin: 0 0 .7rem;
  font-size: .8rem;
  letter-spacing: .22em;
  color: var(--celadon);
}

.page-about .team-card h3 {
  margin: 0 0 .55rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-rhythm {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  border-left: 4px solid var(--steel);
}

.page-about .about-rhythm__title {
  margin: 0 0 .6rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-rhythm p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 06 联络 ---------- */
.page-about .about-support {
  padding: clamp(2.6rem, 6vw, 4.5rem) 0;
  color: var(--on-dark);
  background:
    radial-gradient(96% 80% at 92% 0%, rgba(46, 139, 122, .26) 0%, transparent 56%),
    linear-gradient(150deg, #071A33 0%, #0B2545 62%, #123A63 100%);
}

.page-about .about-support__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  align-items: start;
}

.page-about .about-support__eyebrow {
  color: var(--amber);
}

.page-about .about-support__lead h2 {
  margin: 0 0 .8rem;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.28;
  font-weight: 800;
  color: #fff;
}

.page-about .about-support__lead p:not(.eyebrow) {
  margin: 0 0 1.5rem;
  max-width: 52ch;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .about-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

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

.page-about .about-support__contact > div {
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--about-glass-line);
}

.page-about .about-support__contact > div:last-child {
  border-bottom: 0;
}

.page-about .about-support__contact dt {
  margin-bottom: .4rem;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--amber-soft);
}

.page-about .about-support__contact dd {
  margin: 0;
  font-size: .95rem;
  color: #fff;
  word-break: break-word;
}

.page-about .about-support__more {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-glass-line);
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(220, 231, 242, .78);
}

.page-about .about-support__more a {
  color: var(--amber-soft);
}

.page-about .about-support__more a:hover,
.page-about .about-support__more a:focus-visible {
  color: #fff;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-shandong {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-support__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.75rem, 3.5vw, 3rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: 7rem;
    padding: .2rem 0 .2rem 1rem;
    border-top: 0;
    border-left: 2px solid rgba(242, 169, 0, .45);
  }

  .page-about .about-rail__list {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: .3rem;
  }

  .page-about .about-rail__list a {
    width: 100%;
  }

  .page-about .about-hero__media img {
    max-height: 420px;
  }
}

@media (min-width: 960px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-timeline__item {
    padding-left: 1.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cat-card,
  .page-about .about-card,
  .page-about .team-card,
  .page-about .about-rail__list a {
    transition: background-color .2s ease, color .2s ease, border-color .2s ease;
  }

  .page-about .cat-card:hover,
  .page-about .about-card:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}