.page-about {
  display: block;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumbs {
  padding: 16px 0 4px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-2);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

/* ===== 画板通用 ===== */
.page-about .panel {
  position: relative;
  overflow: hidden;
  margin: 0 auto clamp(20px, 3vw, 38px);
  padding: clamp(26px, 4.2vw, 58px) clamp(18px, 3.4vw, 52px);
  border-radius: var(--r-lg);
  background: var(--panel);
}

.page-about .panel__head {
  max-width: 74ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .panel__title {
  margin: .25em 0 .5em;
  font-size: clamp(22px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: .02em;
  font-weight: 800;
  color: var(--text);
}

.page-about .lede {
  max-width: 64ch;
  margin: 0;
  color: var(--text-2);
  line-height: 1.75;
}

.page-about .prose p {
  margin: 0 0 1.15em;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .prose a,
.page-about .about-timeline__more a,
.page-about .about-cert__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, .4);
}

.page-about .prose a:hover,
.page-about .about-timeline__more a:hover,
.page-about .about-cert__note a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .num {
  font-family: var(--font-mono);
  color: var(--amber);
  font-weight: 700;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  background:
    radial-gradient(130% 120% at 6% 0%, rgba(124, 58, 237, .45) 0%, rgba(27, 20, 64, 0) 58%),
    radial-gradient(90% 90% at 102% 6%, rgba(34, 211, 238, .24) 0%, rgba(27, 20, 64, 0) 62%),
    var(--indigo);
}

.page-about .about-hero__rail {
  position: absolute;
  top: clamp(26px, 4vw, 56px);
  right: clamp(10px, 1.6vw, 22px);
  z-index: 2;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: .9em;
}

.page-about .about-hero h1 {
  margin: 0 0 .55em;
  max-width: 22ch;
  font-size: clamp(28px, 5.6vw, 56px);
  line-height: 1.12;
  letter-spacing: .02em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-hero .lede {
  max-width: 58ch;
  color: var(--text-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 0;
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .58);
}

.page-about .about-hero__stats .stat {
  display: grid;
  gap: 4px;
}

.page-about .about-hero__stats .stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--text-2);
}

.page-about .about-hero__stats .stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
  border-bottom: 2px solid rgba(245, 185, 66, .35);
  padding-bottom: 4px;
}

/* ===== 起点 ===== */
.page-about .about-origin {
  background: linear-gradient(150deg, var(--indigo) 0%, var(--panel) 62%);
}

.page-about .about-origin__grid {
  align-items: start;
}

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

.page-about .about-origin__list .list-index__num {
  font-family: var(--font-mono);
  color: var(--cyan);
}

/* ===== 版本时间轴 ===== */
.page-about .about-versions {
  position: relative;
  background: var(--teal);
}

.page-about .about-versions__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .about-versions__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .32;
}

.page-about .about-versions__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 46, 44, .9) 0%, rgba(5, 7, 12, .96) 100%);
}

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

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  border-radius: var(--pill);
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 58%, rgba(34, 48, 82, .3) 100%);
  opacity: .8;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .about-timeline__marker {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--pill);
  border: 2px solid var(--amber);
  background: rgba(5, 7, 12, .86);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--amber);
  box-shadow: 0 0 0 5px rgba(12, 46, 44, .7), 0 0 18px rgba(245, 185, 66, .22);
}

.page-about .about-timeline__marker--current {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(34, 211, 238, .12), 0 0 26px rgba(34, 211, 238, .4);
}

.page-about .about-timeline__body {
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .66);
}

.page-about .about-timeline__item--current .about-timeline__body {
  border-color: rgba(34, 211, 238, .42);
  background: linear-gradient(140deg, rgba(27, 20, 64, .72) 0%, rgba(5, 7, 12, .74) 70%);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 .6em;
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-timeline__body p {
  margin: 0 0 .8em;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-about .about-timeline__more {
  margin-top: 1em !important;
  font-size: 14px;
}

/* ===== 团队 ===== */
.page-about .about-team {
  background: linear-gradient(200deg, var(--panel) 0%, #0d1330 55%, var(--indigo) 100%);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 38px);
}

.page-about .about-team__chart {
  position: relative;
  width: min(260px, 74vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.page-about .about-team__donut {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--violet) 0deg 94.3deg,
    var(--cyan) 94.3deg 171.4deg,
    var(--ok) 171.4deg 240deg,
    var(--amber) 240deg 291.4deg,
    var(--off) 291.4deg 360deg
  );
  transition: transform .35s var(--ease);
}

.page-about .about-team__donut::after {
  content: "";
  position: absolute;
  inset: 24%;
  border-radius: 50%;
  background: var(--panel);
}

.page-about .about-team__center {
  position: absolute;
  inset: 30%;
  z-index: 1;
  display: grid;
  place-content: center;
  text-align: center;
}

.page-about .about-team__center strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  color: var(--amber);
  line-height: 1.1;
}

.page-about .about-team__center span {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--text-2);
}

.page-about .about-team__figure {
  display: block;
  margin-top: clamp(18px, 2.6vw, 26px);
  width: 100%;
  max-width: 1200px;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .about-team__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto;
  grid-template-areas:
    "dot name count"
    "dot role role";
  align-items: center;
  gap: 6px 12px;
  padding: 13px 15px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .5);
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-team__row:hover {
  transform: translateX(4px);
  border-color: var(--cyan);
  background: rgba(34, 211, 238, .08);
}

.page-about .about-team__dot {
  grid-area: dot;
  width: 12px;
  height: 12px;
  border-radius: var(--pill);
  background: var(--violet);
}

.page-about .about-team__row:nth-child(1) .about-team__dot { background: var(--violet); }
.page-about .about-team__row:nth-child(2) .about-team__dot { background: var(--cyan); }
.page-about .about-team__row:nth-child(3) .about-team__dot { background: var(--ok); }
.page-about .about-team__row:nth-child(4) .about-team__dot { background: var(--amber); }
.page-about .about-team__row:nth-child(5) .about-team__dot { background: var(--off); }

.page-about .about-team__name {
  grid-area: name;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-team__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-team__role {
  grid-area: role;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .about-team__side {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .45);
}

.page-about .about-team__side-title {
  margin: 0 0 .7em;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-team__side p {
  margin: 0 0 1.2em;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-team__kpi {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-team__kpi div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(34, 48, 82, .8);
}

.page-about .about-team__kpi div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-team__kpi dt {
  font-size: 13px;
  color: var(--text-2);
}

.page-about .about-team__kpi dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
  white-space: nowrap;
}

/* ===== 服务范围 ===== */
.page-about .about-coverage {
  background: linear-gradient(120deg, #2a0e1e 0%, var(--panel) 62%);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
  align-items: center;
}

.page-about .about-coverage__text .panel__title {
  margin-top: .15em;
}

.page-about .about-coverage__text p {
  margin: 0 0 1.05em;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-coverage__facts {
  display: grid;
  gap: 10px;
  margin: 1.4em 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coverage__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .5);
  font-size: 14px;
  color: var(--text);
}

.page-about .about-coverage__facts .num {
  font-size: 18px;
}

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

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
}

/* ===== 改版标准 ===== */
.page-about .about-metrics {
  background: linear-gradient(170deg, var(--indigo) 0%, var(--panel) 68%);
}

.page-about .about-metrics__grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-metric {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.8vw, 28px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(27, 20, 64, .92) 0%, rgba(11, 16, 32, .92) 100%);
}

.page-about .about-metric::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--violet) 0%, var(--cyan) 100%);
}

.page-about .about-metric__index {
  margin: 0 0 .6em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-metric h3 {
  margin: 0 0 .6em;
  font-size: clamp(17px, 2.1vw, 20px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-metric p {
  margin: 0 0 .8em;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-metric__note {
  margin: 0 !important;
  padding-top: .8em;
  border-top: 1px dashed rgba(34, 48, 82, .85);
  font-size: 13px;
  color: var(--text-2);
}

/* ===== 资质与联络 ===== */
.page-about .about-cert {
  margin-bottom: 0;
  background: linear-gradient(130deg, var(--teal) 0%, var(--panel) 58%, var(--indigo) 100%);
}

.page-about .about-cert__grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-cert__kv {
  display: grid;
  gap: 0;
  margin: 0;
}

.page-about .about-cert__kv div {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px dashed rgba(34, 48, 82, .8);
}

.page-about .about-cert__kv div:first-child {
  padding-top: 0;
}

.page-about .about-cert__kv dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-2);
}

.page-about .about-cert__kv dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-cert__kv a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-cert__note {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(5, 7, 12, .52);
}

.page-about .about-cert__note p {
  margin: 0 0 1em;
  line-height: 1.8;
  color: var(--text-2);
}

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

.page-about .about-cert__sign {
  padding-top: 1em;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-2);
}

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

@media (min-width: 780px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-team__side {
    grid-column: 1 / -1;
  }

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

  .page-about .about-cert__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.05fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-team__side {
    grid-column: auto;
  }

  .page-about .about-team__chart {
    width: min(300px, 100%);
  }
}

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

  .page-about .about-team__row:hover {
    transform: none;
  }
}