.page-about {
  background: var(--ink);
  color: var(--white);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

@media (min-width: 940px) {
  .page-about .about-shell {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 64px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 22px);
  }
}

/* ---------- 左侧注释栏 ---------- */

.page-about .about-rail {
  display: grid;
  gap: 16px;
  align-content: start;
  min-width: 0;
}

.page-about .about-rail__badge {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--grid);
  border-radius: 14px;
  background: linear-gradient(158deg, rgba(46, 242, 200, 0.14), var(--ink-2) 58%);
}

.page-about .about-rail__badge-k {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-ver {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--aurora);
  line-height: 1.2;
}

.page-about .about-rail__badge-n {
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-status {
  border: 1px solid var(--grid);
  border-radius: 14px;
  padding: 13px 16px 15px;
  background: var(--ink-2);
}

.page-about .about-status__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-status__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--steel);
}

.page-about .about-status__ok {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--white);
}

.page-about .about-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--aurora);
  box-shadow: 0 0 0 3px rgba(46, 242, 200, 0.18);
  flex: none;
}

.page-about .about-jump__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-jump__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-jump__list a {
  display: block;
  padding: 7px 0 7px 13px;
  border-left: 1px solid var(--grid);
  font-size: 13.5px;
  color: var(--steel);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  color: var(--ice);
  border-left-color: var(--ice);
}

/* ---------- 右侧内容流 ---------- */

.page-about .about-stream {
  display: grid;
  gap: clamp(44px, 7vw, 88px);
  min-width: 0;
}

.page-about .about-hero {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: end;
    gap: clamp(20px, 2.4vw, 34px);
  }
  .page-about .about-hero__text {
    grid-column: 1 / 8;
  }
  .page-about .about-hero__media {
    grid-column: 8 / 13;
  }
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.2vw, 56px);
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1.14;
  color: var(--white);
}

.page-about .about-hero__title span {
  color: var(--aurora);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  border-radius: 22px 22px 22px 4px;
  overflow: hidden;
  border: 1px solid var(--grid);
  background: linear-gradient(150deg, var(--ink-2), var(--ink-3) 48%, var(--ink));
  min-height: 200px;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  display: grid;
  gap: 16px;
  min-width: 0;
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.1vw, 34px);
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.26;
  color: var(--white);
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 服务对象 ---------- */

.page-about .about-audience {
  display: grid;
  gap: 1px;
  margin-top: 6px;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: 18px;
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-audience__item {
  display: grid;
  gap: 7px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-2);
}

.page-about .about-audience__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--aurora);
}

.page-about .about-audience__item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 目录 ---------- */

.page-about .about-catalog {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: 4px;
}

@media (min-width: 860px) {
  .page-about .about-catalog {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .about-map-fig {
    grid-column: 1 / 13;
  }
  .page-about .about-cat-list {
    grid-column: 1 / 9;
  }
  .page-about .about-figure {
    grid-column: 9 / 13;
  }
}

.page-about .about-map-fig {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  box-sizing: border-box;
  padding: clamp(12px, 2vw, 22px);
  border: 1px solid var(--grid);
  border-radius: 18px;
  background:
    radial-gradient(circle at 16% 18%, rgba(46, 242, 200, 0.1), transparent 58%),
    radial-gradient(circle at 92% 84%, rgba(46, 125, 255, 0.12), transparent 55%),
    var(--ink-2);
}

.page-about .about-figure {
  margin: 0;
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 18px 18px 18px 4px;
  border: 1px solid var(--grid);
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
}

.page-about .about-figure__cap {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-cat-list {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .about-cat {
  border: 1px solid var(--grid);
  border-radius: 14px;
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-cat__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--white);
}

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

.page-about .about-cat__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--ice);
}

.page-about .about-cat[open] .about-cat__sum::after {
  content: "–";
}

.page-about .about-cat[open] .about-cat__sum {
  border-bottom: 1px solid var(--grid);
}

.page-about .about-cat__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--aurora);
  border: 1px solid rgba(46, 242, 200, 0.42);
  border-radius: 6px;
  padding: 2px 6px;
  flex: none;
}

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

.page-about .about-cat__list {
  list-style: none;
  margin: 0;
  padding: 13px 16px 16px;
  display: grid;
  gap: 8px;
}

.page-about .about-cat__list li {
  position: relative;
  padding-left: 15px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-cat__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--glacier);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-rhythm {
  display: grid;
  gap: 12px;
  margin-top: 6px;
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 2px solid var(--glacier);
}

.page-about .about-rhythm h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 66ch;
}

.page-about .about-rhythm__list li {
  display: grid;
  gap: 4px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

@media (min-width: 640px) {
  .page-about .about-rhythm__list li {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

.page-about .about-rhythm__k {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ice);
}

/* ---------- 时间轴 ---------- */

.page-about .about-figure--timeline {
  margin: 4px 0 6px;
}

.page-about .about-time {
  list-style: none;
  margin: 0 0 0 5px;
  padding: 0;
  border-left: 1px solid var(--grid);
}

.page-about .about-time__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 0 0 clamp(24px, 3.4vw, 38px) clamp(20px, 2.6vw, 30px);
}

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

.page-about .about-time__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1.5px solid var(--ice);
}

.page-about .about-time__item--now::before {
  background: var(--aurora);
  border-color: var(--aurora);
  box-shadow: 0 0 0 4px rgba(46, 242, 200, 0.16);
}

.page-about .about-time__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ice);
}

.page-about .about-time__item--now .about-time__year {
  color: var(--aurora);
}

.page-about .about-time__item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-time__item p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 服务保障 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: 16px;
  overflow: hidden;
  margin-top: 4px;
}

@media (min-width: 720px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-metrics__cell {
  display: grid;
  gap: 5px;
  padding: clamp(16px, 2.2vw, 24px);
  background: linear-gradient(168deg, var(--ink-2), var(--ink));
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.5vw, 29px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--aurora);
  line-height: 1.2;
}

.page-about .about-metrics__cap {
  font-size: 12.5px;
  color: var(--steel);
}

.page-about .about-guard {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .about-guard li {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px) clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--grid);
  border-left: 2px solid var(--ice);
  border-radius: 4px 16px 16px 4px;
  background: var(--ink-2);
}

.page-about .about-guard h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-guard p {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 联系卡 ---------- */

.page-about .about-contact {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: 8px;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--grid);
  border-radius: 20px;
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 122, 61, 0.16), transparent 56%),
    radial-gradient(circle at 6% 96%, rgba(46, 125, 255, 0.16), transparent 58%),
    linear-gradient(160deg, var(--ink-2), var(--ink));
}

@media (min-width: 780px) {
  .page-about .about-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
    gap: clamp(24px, 3.4vw, 46px);
  }
}

.page-about .about-contact__lead h3 {
  margin: 0;
  font-size: clamp(18px, 1.8vw, 21px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-contact__lead p {
  margin: 10px 0 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-contact__list {
  margin: 0;
  display: grid;
  gap: 4px;
  padding: 18px;
  border: 1px solid var(--grid);
  border-radius: 14px;
  background: rgba(7, 11, 18, 0.55);
}

.page-about .about-contact__list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ice);
}

.page-about .about-contact__list dd {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-about .about-contact__list dd:last-child {
  margin-bottom: 0;
}

.page-about .about-next {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-next .mono {
  display: inline-block;
  margin-right: 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

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