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

/* ---------- 01 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: 18px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-dark) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-dark) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  margin: 0 0 28px;
  color: var(--dim);
  font-size: 13px;
}

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

.page-about .about-hero__crumb a:hover {
  color: var(--orange);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-bottom: 24px;
}

.page-about .about-hero__intro .lede {
  margin-top: 14px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 255, 255, .03);
  color: var(--silver);
  font-size: 14px;
}

.page-about .about-hero__facts .mono {
  color: var(--orange);
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__periods {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-hero__periodsLabel {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dim);
}

/* 周期卡片 */
.page-about .period-card {
  position: relative;
  padding: 20px 20px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .period-card:hover,
.page-about .period-card:focus-within {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .period-card__tag {
  position: absolute;
  top: -11px;
  right: 16px;
  padding: 3px 10px;
  background: var(--ink);
  border: 1px solid var(--orange);
  border-radius: 999px;
  color: var(--orange);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .period-card__tag--blue {
  border-color: var(--blue);
  color: var(--blue);
}

.page-about .period-card__tag--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .period-card__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .period-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .period-card__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--line-dark);
  display: grid;
  gap: 7px;
}

.page-about .period-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--dim);
}

.page-about .period-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  opacity: .8;
}

.page-about .about-hero__periodsNote {
  margin: 4px 0 0;
  padding: 12px 14px;
  border: 1px dashed var(--line-dark);
  border-radius: var(--r);
  font-size: 13px;
  line-height: 1.6;
  color: var(--dim);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.page-about .about-head .lede {
  margin-top: 12px;
}

/* ---------- 02 服务对象 ---------- */
.page-about .about-who__grid {
  align-items: stretch;
}

.page-about .about-who__card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-top: 28px;
}

.page-about .about-who__idx {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 22px;
  font-weight: 700;
  color: var(--orange-deep);
  opacity: .55;
}

.page-about .about-who__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 7px;
}

.page-about .about-who__list li {
  position: relative;
  padding-left: 15px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-who__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
}

/* ---------- 03 交付与响应 ---------- */
.page-about .about-sla__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  margin-bottom: 36px;
}

.page-about .about-sla__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--paper);
  border: 0;
  border-radius: 0;
}

.page-about .about-sla__value {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sla__stat:nth-child(3) .about-sla__value,
.page-about .about-sla__stat:nth-child(4) .about-sla__value {
  color: var(--orange-deep);
}

.page-about .about-sla__stat .stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-sla__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-sla__col {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--muted);
  border-radius: var(--r);
}

.page-about .about-sla__col--ours {
  border-left-color: var(--orange);
}

.page-about .about-sla__colTitle {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-sla__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-sla__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-sla__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 10px;
  height: 10px;
  border: 1px solid var(--muted);
  border-radius: 1px;
}

.page-about .about-sla__col--ours .about-sla__list li::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-sla__tail {
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--paper);
  font-size: 14px;
  line-height: 1.65;
  color: var(--text);
}

/* ---------- 04 节点覆盖 ---------- */
.page-about .about-nodes__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-nodes__bars {
  display: grid;
  gap: 16px;
}

.page-about .about-nodes__bar {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: center;
  gap: 10px;
}

.page-about .about-nodes__barLabel {
  font-size: 13px;
  color: var(--silver);
}

.page-about .about-nodes__barTrack {
  display: block;
  height: 6px;
  background: var(--ink-3);
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  overflow: hidden;
}

.page-about .about-nodes__barFill {
  display: block;
  height: 100%;
  width: 42%;
  background: var(--blue);
}

.page-about .about-nodes__barFill--high {
  width: 88%;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
}

.page-about .about-nodes__barVal {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: .04em;
}

.page-about .about-nodes__notes {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-nodes__notes li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--silver);
  border-bottom: 1px solid var(--line-dark);
  padding-bottom: 12px;
}

.page-about .about-nodes__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--orange);
  border-radius: 50%;
}

.page-about .about-nodes__notes .mono {
  color: var(--paper);
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-nodes__figure {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--ink-3);
}

.page-about .about-nodes__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .88;
}

.page-about .about-nodes__caption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--dim);
  border-top: 1px solid var(--line-dark);
}

/* ---------- 05 发展历程 ---------- */
.page-about .about-history__banner {
  margin: 0 0 42px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .about-timeline {
  position: relative;
  padding: 4px 0 8px;
}

.page-about .about-timeline__line {
  display: none;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item:target .about-timeline__card {
  border-color: var(--orange);
  box-shadow: 0 0 0 1px var(--orange);
}

.page-about .about-timeline__node {
  position: absolute;
  left: -6px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--orange);
  transition: background .2s ease, transform .2s ease;
}

.page-about .about-timeline__node:hover {
  background: var(--orange);
  transform: scale(1.18);
}

.page-about .about-timeline__item:target .about-timeline__node {
  background: var(--orange);
}

.page-about .about-timeline__card {
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .2s ease, box-shadow .2s ease;
}

.page-about .about-timeline__year {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--orange-deep);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16.5px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-history__link {
  margin: 30px 0 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text);
}

.page-about .about-history__link a {
  color: var(--orange-deep);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-history__link a:hover {
  color: var(--orange);
}

/* ---------- 06 团队与资质 ---------- */
.page-about .about-team__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

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

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

.page-about .about-team__roster {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 54px 96px 1fr;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__role {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team__desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-team__sub {
  margin: 26px 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .badge-list__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text);
}

.page-about .badge-list__num {
  color: var(--orange-deep);
  font-size: 12px;
  font-weight: 700;
}

/* ---------- 07 服务边界 ---------- */
.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-scope__col {
  padding: 20px;
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--dim);
  border-radius: var(--r);
}

.page-about .about-scope__col--ours {
  border-top-color: var(--orange);
}

.page-about .about-scope__col--third {
  border-top-color: var(--cyan);
}

.page-about .about-scope__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-scope__list li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--dim);
  border-radius: 50%;
}

.page-about .about-scope__col--ours .about-scope__list li::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-scope__col--third .about-scope__list li::before {
  border-color: var(--cyan);
}

.page-about .about-scope__cta {
  margin-top: 32px;
  padding: 24px 22px;
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--orange);
  border-radius: var(--r);
  background: rgba(255, 90, 31, .05);
  display: grid;
  gap: 18px;
}

.page-about .about-scope__ctaText {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--paper);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-hero__facts li {
    flex-direction: column;
    gap: 4px;
    border-left-width: 2px;
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 52px;
    align-items: start;
    padding-bottom: 34px;
  }

  .page-about .period-card:nth-child(3) {
    margin-top: 24px;
  }

  .page-about .period-card:nth-child(4) {
    margin-top: 48px;
  }

  .page-about .about-nodes__split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-team__split {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-scope__col--third {
    grid-column: auto;
  }

  .page-about .about-scope__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-sla__stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-sla__stat {
    padding: 22px 14px;
  }

  .page-about .about-sla__value {
    font-size: 30px;
  }

  /* 横向时间轴：节点上下交替 */
  .page-about .about-timeline {
    padding: 0;
  }

  .page-about .about-timeline__line {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background: var(--line);
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-rows: 1fr auto 1fr;
    justify-items: center;
    align-items: center;
    padding: 0;
    border-left: 0;
    min-height: 280px;
  }

  .page-about .about-timeline__node {
    position: relative;
    left: auto;
    top: auto;
    grid-row: 2;
    justify-self: center;
    margin: 6px 0;
    border-color: var(--orange);
    background: var(--paper);
    z-index: 1;
  }

  .page-about .about-timeline__item--up .about-timeline__card {
    grid-row: 1;
    align-self: end;
    margin-bottom: 8px;
  }

  .page-about .about-timeline__item--down .about-timeline__card {
    grid-row: 3;
    align-self: start;
    margin-top: 8px;
  }

  .page-about .about-timeline__card {
    width: 100%;
    box-sizing: border-box;
  }
}

@media (min-width: 1220px) {
  .page-about .about-hero__inner {
    gap: 64px;
  }

  .page-about .about-timeline__list {
    gap: 0 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .period-card,
  .page-about .about-timeline__node,
  .page-about .about-timeline__card {
    transition: none;
  }
}