.page-about {
  --about-card: #ffffff;
  --about-rule: rgba(35, 64, 95, 0.28);
  --about-body: rgba(11, 31, 58, 0.82);
  --about-ink-teal: #0a6f66;
  background: var(--paper);
  color: var(--navy);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(96px, 16vw, 150px) 0 clamp(44px, 7vw, 72px);
  background: linear-gradient(160deg, var(--navy) 0%, var(--ink) 100%);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(35, 64, 95, 0.55) 1px, transparent 1px),
    linear-gradient(180deg, rgba(35, 64, 95, 0.4) 1px, transparent 1px);
  background-size: 84px 84px, 84px 84px;
  -webkit-mask-image: radial-gradient(circle at 76% 18%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 76% 18%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 460px;
  height: 460px;
  right: -140px;
  top: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 199, 0.22) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .crumbs {
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(247, 244, 236, 0.55);
}

.page-about .about-hero .crumbs a {
  color: rgba(247, 244, 236, 0.78);
  text-decoration: none;
}

.page-about .about-hero .crumbs a:hover {
  color: var(--teal);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 24ch;
  font-family: var(--font-head);
  font-size: clamp(31px, 7vw, 66px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40rem;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(247, 244, 236, 0.82);
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  background: rgba(35, 64, 95, 0.85);
  border: 1px solid rgba(35, 64, 95, 0.85);
}

.page-about .about-hero__facts li {
  padding: 16px 18px;
  background: rgba(18, 43, 74, 0.72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .about-fact__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  color: var(--teal);
  letter-spacing: -0.01em;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(247, 244, 236, 0.7);
}

/* ---------- 编辑部目录 + 内容栏 ---------- */
.page-about .about-shell {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) var(--pad-x) clamp(48px, 7vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-index {
  border-top: 2px solid var(--navy);
  padding-top: 14px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--eas), border-color 0.18s var(--eas);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--about-ink-teal);
  border-bottom-color: var(--orange);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--about-rule);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-content > .about-sec:first-child {
  border-top: none;
  padding-top: 0;
}

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

.page-about .about-sec__no--light {
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--navy);
}

.page-about .about-sec__lede {
  margin: 0 0 20px;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-sec .prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

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

/* 深色章节 */
.page-about .about-sec--ink {
  margin: clamp(22px, 4vw, 38px) 0;
  padding: clamp(26px, 4vw, 44px) clamp(20px, 3.5vw, 40px);
  border-top: none;
  border-radius: 2px;
  background: linear-gradient(155deg, var(--navy) 0%, var(--ink) 100%);
  color: var(--paper);
}

.page-about .about-sec--ink .about-sec__title {
  color: var(--paper);
}

.page-about .about-sec--ink .about-sec__lede {
  color: rgba(247, 244, 236, 0.78);
  max-width: 46ch;
}

.page-about .about-sec--ink .about-sec .prose p,
.page-about .about-sec--ink .prose p {
  color: rgba(247, 244, 236, 0.8);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-figure .media {
  overflow: hidden;
  border: 1px solid var(--about-rule);
  background: var(--glass);
}

.page-about .about-sec--ink .about-figure .media {
  border-color: rgba(35, 64, 95, 0.9);
}

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

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-timeline__media {
  margin: 0 0 clamp(18px, 3vw, 26px);
}

.page-about .about-timeline__media .media {
  overflow: hidden;
  border: 1px solid rgba(35, 64, 95, 0.9);
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.9;
}

/* ---------- 组织图 ---------- */
.page-about .about-org {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 12px;
  overflow-x: auto;
  border: 1px solid var(--about-rule);
  background: var(--about-card);
}

.page-about .org {
  display: block;
  width: 100%;
  min-width: 540px;
  height: auto;
}

.page-about .org__line {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .org__node rect {
  fill: var(--paper);
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .org__node text {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  text-anchor: middle;
  fill: var(--navy);
}

.page-about .org__node .org__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 400;
  fill: var(--steel);
}

.page-about .org__node--accent rect {
  stroke: var(--teal);
  stroke-width: 2;
}

.page-about .org__node--root rect {
  fill: var(--navy);
  stroke: var(--navy);
}

.page-about .org__node--root text {
  fill: var(--paper);
}

.page-about .org__node--root .org__num {
  fill: var(--teal);
}

/* ---------- 角色折叠卡 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .role {
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--line);
  background: var(--about-card);
  transition: border-left-color 0.18s var(--eas);
}

.page-about .role[open] {
  border-left-color: var(--teal);
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15.5px;
}

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

.page-about .role__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--orange);
}

.page-about .role[open] .role__head::after {
  content: "–";
}

.page-about .role__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--orange);
}

.page-about .role__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  color: var(--steel);
}

.page-about .role__head::after {
  margin-left: 12px;
}

.page-about .role__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .flow__step {
  position: relative;
  padding: 0 0 22px 46px;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: -2px;
  width: 1px;
  background: rgba(0, 229, 199, 0.32);
}

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

.page-about .flow__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(0, 229, 199, 0.5);
  border-radius: 50%;
  background: var(--navy);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--teal);
}

.page-about .flow__step h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .flow__step p {
  margin: 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(247, 244, 236, 0.76);
}

/* ---------- 设备清单 ---------- */
.page-about .device-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .device-list__item {
  padding: 18px 16px;
  background: var(--about-card);
}

.page-about .device-list__item h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.01em;
}

.page-about .device-list__item h3::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--teal);
}

.page-about .device-list__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-inline-link {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-inline-link a {
  color: var(--about-ink-teal);
  text-decoration: none;
  border-bottom: 1px solid var(--teal);
  padding-bottom: 1px;
}

.page-about .about-inline-link a:hover {
  color: var(--navy);
  border-bottom-color: var(--orange);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-top: 1px dashed rgba(143, 247, 233, 0.24);
}

.page-about .tl__item:first-child {
  border-top: none;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: 0.02em;
  color: var(--teal);
}

.page-about .tl__item--current .tl__year {
  color: var(--orange);
}

.page-about .tl__body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--paper);
}

.page-about .tl__body p {
  margin: 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(247, 244, 236, 0.76);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .honor-list > li {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .honor__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--navy);
}

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

.page-about .honor__head::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--steel);
  letter-spacing: 0.06em;
}

.page-about .honor[open] .honor__head::after {
  content: "收起";
  color: var(--orange);
}

.page-about .honor__tag {
  flex: none;
  padding: 2px 7px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  color: var(--steel);
  letter-spacing: 0.08em;
}

.page-about .honor__body {
  margin: 0;
  padding: 0 2px 16px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body);
}

/* ---------- 规模 ---------- */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .stats__cell {
  padding: 18px 16px;
  background: var(--about-card);
}

.page-about .stats__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-about .stats__num em {
  font-style: normal;
  font-size: 0.55em;
  color: var(--orange);
  margin-left: 2px;
}

.page-about .stats__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(11, 31, 58, 0.7);
}

/* ---------- 结语行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(26px, 4vw, 46px) clamp(20px, 3.5vw, 40px);
  border-radius: 2px;
  background:
    radial-gradient(circle at 88% 12%, rgba(0, 229, 199, 0.18) 0%, transparent 58%),
    linear-gradient(150deg, var(--navy) 0%, var(--ink) 100%);
  color: var(--paper);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 244, 236, 0.78);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .tl__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 58px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-index__link {
    width: 100%;
    padding: 9px 0;
    border-bottom: 1px solid rgba(35, 64, 95, 0.18);
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .role {
    transition: none;
  }
}