/* ============ page-about ============ */
.page-about {
  --about-rail-w: 108px;
  --about-gap: 40px;
  background: var(--ink);
  color: var(--ice);
}

/* --- 面包屑间距 --- */
.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 6px;
}

/* ================= HERO ================= */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(30px, 5vw, 58px);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(720px 320px at 88% 0%, rgba(37, 225, 210, 0.16), transparent 68%),
    radial-gradient(560px 300px at 2% 100%, rgba(124, 92, 255, 0.15), transparent 70%),
    repeating-linear-gradient(0deg, rgba(29, 55, 87, 0.35) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(29, 55, 87, 0.35) 0 1px, transparent 1px 48px),
    var(--ink-deep);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-hero__lead {
  padding: clamp(22px, 3.2vw, 36px);
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-hero__lead .lede {
  margin-top: 16px;
  max-width: 62ch;
}

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

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .hero-chip {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  min-height: 104px;
  padding: 16px 16px 18px;
  border: 2px solid var(--line);
  background: rgba(15, 32, 53, 0.86);
  box-shadow: var(--shadow-soft);
}

.page-about .hero-chip__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
}

.page-about .hero-chip__txt {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .hero-chip--cyan {
  border-color: var(--cyan);
}
.page-about .hero-chip--cyan .hero-chip__num {
  color: var(--cyan);
}

.page-about .hero-chip--coral {
  border-color: var(--coral);
}
.page-about .hero-chip--coral .hero-chip__num {
  color: var(--coral);
}

.page-about .hero-chip--gold {
  border-color: var(--gold);
}
.page-about .hero-chip--gold .hero-chip__num {
  color: var(--gold);
}

.page-about .hero-chip--violet {
  border-color: var(--violet);
}
.page-about .hero-chip--violet .hero-chip__num {
  color: var(--violet);
}

/* ================= SHELL ================= */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  padding-block: clamp(26px, 4vw, 52px) clamp(40px, 6vw, 72px);
}

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

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

/* ================= 通用区块 ================= */
.page-about .about-block {
  padding-block: clamp(30px, 4.4vw, 56px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-block--narrow > * {
  max-width: 760px;
}

.page-about .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-block .lede,
.page-about .about-cta .lede {
  margin-top: 14px;
  max-width: 68ch;
  color: var(--mist);
}

.page-about .about-copy {
  margin-top: 18px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-note {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
  background: rgba(243, 194, 75, 0.07);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-link {
  margin-top: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(37, 225, 210, 0.45);
  padding-bottom: 1px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ================= 图片框微调 ================= */
.page-about .about-shot {
  margin: 22px 0 0;
}

.page-about .about-banner {
  margin: 20px 0 28px;
}

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

/* ================= 01 平台三件事 ================= */
.page-about .scope-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .scope-item {
  padding: 22px 20px 24px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .scope-item:hover {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
}

.page-about .scope-item__no {
  display: inline-block;
  padding-bottom: 5px;
  border-bottom: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .scope-item__title {
  margin: 16px 0 10px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .scope-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ================= 02 编审流程 ================= */
.page-about .flow-steps {
  position: relative;
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .flow-step {
  position: relative;
  z-index: 1;
  padding: 20px 18px 22px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-about .flow-step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--cyan);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .flow-step h3 {
  margin: 14px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--ice);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ================= 03 历程时间线 ================= */
.page-about .tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 26px 30px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .tl__year {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .tl__dot {
  position: absolute;
  left: -30px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  border: 2px solid var(--gold);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(243, 194, 75, 0.14);
}

.page-about .tl__body {
  margin-top: 10px;
  max-width: 66ch;
}

.page-about .tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* 折线图 */
.page-about .growth {
  margin: 34px 0 0;
  padding: 18px 16px 10px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-about .growth svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .growth__cap {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-align: center;
}

/* ================= 04 团队 ================= */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .team-card {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-about .team-card__title {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .team-card__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 18px 16px;
  border: 0;
  background: transparent;
  color: var(--ice);
  text-align: left;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}

.page-about .team-card__trigger:hover,
.page-about .team-card__trigger:focus-visible {
  background: rgba(37, 225, 210, 0.08);
}

.page-about .team-card__city {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .team-card__role {
  flex: 1 1 auto;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .team-card .accordion__mark {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--coral);
  border-bottom: 2px solid var(--coral);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-about .team-card__trigger[aria-expanded="true"] .accordion__mark {
  transform: rotate(-135deg);
}

.page-about .team-card__panel {
  padding: 0 16px 20px;
}

.page-about .team-card__panel p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ================= 05 合作 ================= */
.page-about .partner-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 2px solid var(--line);
}

.page-about .partner-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--coral);
}

.page-about .partner-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ================= 06 数据 ================= */
.page-about .metrics {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  border: 2px solid var(--line);
  background: linear-gradient(160deg, rgba(37, 225, 210, 0.09), rgba(15, 32, 53, 0.95) 62%);
}

.page-about .metric__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .metric__unit {
  margin-left: 3px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gold);
}

.page-about .metric__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ================= CTA ================= */
.page-about .about-cta {
  margin-top: clamp(30px, 4.4vw, 56px);
  padding: clamp(24px, 3.6vw, 40px);
  border: 2px solid var(--cyan);
  background:
    radial-gradient(460px 220px at 90% 10%, rgba(37, 225, 210, 0.2), transparent 70%),
    var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta .section-title {
  margin-top: 0;
}

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

/* ================= 平板 ================= */
@media (min-width: 700px) {
  .page-about .scope-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .team-card__trigger {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 18px;
  }

  .page-about .team-card .accordion__mark {
    position: absolute;
    right: 16px;
    bottom: 20px;
  }

  .page-about .team-card__trigger {
    position: relative;
  }

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

/* ================= 桌面：左侧刻度轨 ================= */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

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

  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    padding-top: 4px;
  }

  .page-about .about-rail__cap {
    margin: 0 0 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--mist);
  }

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

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: var(--line);
  }

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

  .page-about .about-rail__link {
    position: relative;
    display: block;
    padding: 12px 0 12px 28px;
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: 0.08em;
    color: var(--mist);
    text-decoration: none;
    transition: color var(--dur) var(--ease);
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 50%;
    width: 12px;
    height: 12px;
    margin-top: -6px;
    border: 2px solid var(--line);
    background: var(--ink);
    transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--cyan);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    border-color: var(--cyan);
    background: var(--cyan);
  }

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

  .page-about .flow-steps::before {
    content: "";
    position: absolute;
    left: 4%;
    right: 4%;
    top: 37px;
    height: 2px;
    background: var(--line);
    z-index: 0;
  }

  .page-about .flow-step {
    margin: 0 8px;
    padding: 20px 16px 24px;
  }

  .page-about .flow-step:first-child {
    margin-left: 0;
  }

  .page-about .flow-step:last-child {
    margin-right: 0;
  }

  .page-about .tl {
    padding-left: 8px;
  }

  .page-about .tl__body h3 {
    font-size: 21px;
  }
}

/* ================= 大屏 ================= */
@media (min-width: 1280px) {
  .page-about .about-shell {
    --about-rail-w: 124px;
  }

  .page-about .hero-chip {
    min-height: 118px;
  }
}

/* ================= 减少动效 ================= */
@media (prefers-reduced-motion: reduce) {
  .page-about .scope-item,
  .page-about .team-card__trigger,
  .page-about .team-card .accordion__mark,
  .page-about .about-rail__link,
  .page-about .about-rail__link::before {
    transition: none;
  }

  .page-about .scope-item:hover {
    transform: none;
  }
}