.page-about {
  --about-hair: rgba(138, 155, 184, 0.26);
  --about-hair-strong: rgba(138, 155, 184, 0.5);
  --about-panel: #1C2B45;
  display: block;
  background: var(--ink-0);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .about-band {
  height: 4px;
  background: linear-gradient(90deg, var(--brand) 0 18%, var(--cyan) 18% 30%, rgba(138, 155, 184, 0.2) 30% 100%);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 6vw, 58px) 0 clamp(38px, 7.5vw, 84px);
  border-bottom: 3px solid var(--brand);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 42%;
  filter: saturate(0.72) contrast(1.12);
  opacity: 0.5;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(168deg, rgba(8, 13, 24, 0.88) 0%, rgba(8, 13, 24, 0.62) 44%, rgba(8, 13, 24, 0.97) 100%),
    radial-gradient(120% 82% at 80% 6%, rgba(22, 217, 227, 0.2), transparent 62%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 4vw, 30px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(138, 155, 184, 0.55);
}

.page-about .breadcrumb-list a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 155, 184, 0.35);
}

.page-about .breadcrumb-list a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  padding: 7px 14px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  background: rgba(22, 217, 227, 0.08);
  border: 1px solid rgba(22, 217, 227, 0.4);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 14em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 6.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--paper);
  text-shadow: 0 18px 46px rgba(0, 0, 0, 0.62);
}

.page-about .about-hero__lead {
  max-width: 44em;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.8vw, 17.5px);
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 34px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px;
  max-width: 720px;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 5px;
  padding: 14px 16px;
  background: rgba(28, 43, 69, 0.6);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--lime);
}

.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-hero__unit {
  margin-left: 5px;
  font-size: 0.5em;
  font-weight: 500;
  color: var(--muted);
}

/* ---------- 通用章节骨架 ---------- */

.page-about .about-section {
  position: relative;
  padding: clamp(46px, 8vw, 92px) 0;
}

.page-about .about-section--band {
  background: var(--ink-1);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 4.5vw, 44px);
}

.page-about .about-head .section-index {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

.page-about .about-head .section-index::after {
  content: "";
  display: block;
  width: 54px;
  height: 2px;
  background: var(--brand);
}

.page-about .about-head .section-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-head .section-lead {
  max-width: 52em;
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.76);
}

/* ---------- 01 定位 ---------- */

.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-text p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: rgba(244, 241, 234, 0.84);
}

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

.page-about .about-panel {
  position: relative;
  padding: clamp(22px, 3.4vw, 32px);
  background: var(--about-panel);
  border: 1px solid var(--about-hair-strong);
  border-top: 4px solid var(--brand);
  box-shadow: var(--shadow-hard);
}

.page-about .about-panel__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.86);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 10px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-panel__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding-bottom: 2px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 217, 227, 0.42);
}

.page-about .about-panel__link:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

/* ---------- 02 团队 ---------- */

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

.page-about .about-team__panel {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--ink-2);
  border: 1px solid var(--about-hair);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .about-team__code {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.26em;
  color: var(--muted);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-team__task {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.8);
}

.page-about .about-team__detail {
  overflow: hidden;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(138, 155, 184, 0.3);
}

.page-about .about-team__detail p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-team-aside {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

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

.page-about .about-rhythm {
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(140deg, rgba(22, 217, 227, 0.1), rgba(16, 26, 46, 0) 72%);
  border-left: 3px solid var(--cyan);
}

.page-about .about-rhythm__label {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

.page-about .about-rhythm ul {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rhythm li {
  padding-bottom: 12px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.8);
  border-bottom: 1px solid rgba(138, 155, 184, 0.16);
}

.page-about .about-rhythm li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-rhythm strong {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
}

/* ---------- 03 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 38px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 16px;
  bottom: -14px;
  width: 2px;
  background: linear-gradient(180deg, rgba(22, 217, 227, 0.5), rgba(138, 155, 184, 0.16));
}

.page-about .about-timeline__item:last-child::before {
  bottom: 40%;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(22, 217, 227, 0.14);
}

.page-about .about-node > summary {
  position: relative;
  display: grid;
  gap: 5px;
  padding: 16px 48px 16px 20px;
  cursor: pointer;
  list-style: none;
  background: rgba(28, 43, 69, 0.55);
  border: 1px solid var(--about-hair);
  border-left: 4px solid var(--brand);
  transition: background 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node > summary::marker {
  content: "";
}

.page-about .about-node > summary:hover {
  border-color: var(--about-hair-strong);
}

.page-about .about-node > summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: transform 0.3s var(--ease);
}

.page-about .about-node[open] > summary {
  background: rgba(28, 43, 69, 0.92);
  border-left-color: var(--cyan);
}

.page-about .about-node[open] > summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.page-about .about-node__stage {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--muted);
}

.page-about .about-node__title {
  font-family: var(--font-head);
  font-size: clamp(16px, 2.2vw, 19px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-node__body {
  padding: 16px 20px 20px;
  background: rgba(16, 26, 46, 0.72);
  border: 1px solid var(--about-hair);
  border-top: 0;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-timeline__figure {
  margin: clamp(30px, 4.5vw, 48px) 0 0;
}

/* ---------- 04 规模 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-metric {
  display: grid;
  gap: 7px;
  padding: clamp(20px, 3vw, 30px) clamp(16px, 2.4vw, 26px);
  background: var(--ink-0);
  transition: background 0.3s var(--ease);
}

.page-about .about-metric:hover {
  background: var(--ink-1);
}

.page-about .about-metric__num {
  font-family: var(--font-num);
  font-size: clamp(27px, 4.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-metric__num--cyan {
  color: var(--cyan);
}

.page-about .about-metric__num--lime {
  color: var(--lime);
}

.page-about .about-metric__num--brand {
  color: var(--brand-soft);
}

.page-about .about-metric__unit {
  margin-left: 5px;
  font-size: 0.42em;
  font-weight: 500;
  color: var(--muted);
}

.page-about .about-metric__label {
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 05 新访客 ---------- */

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

.page-about .about-assure__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 22px;
  background: rgba(28, 43, 69, 0.5);
  border: 1px solid var(--about-hair);
}

.page-about .about-assure__num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-0);
  background: var(--lime);
}

.page-about .about-assure__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-assure__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.78);
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(38px, 6vw, 68px);
  padding: clamp(28px, 5vw, 54px);
  background:
    linear-gradient(122deg, rgba(232, 53, 46, 0.24), rgba(8, 13, 24, 0.08) 46%),
    var(--ink-2);
  border: 1px solid var(--about-hair-strong);
  border-top: 4px solid var(--brand);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -84px;
  top: -84px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 2px solid rgba(22, 217, 227, 0.26);
  pointer-events: none;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__text {
  max-width: 44em;
  margin: 0 0 24px;
  font-size: clamp(14.5px, 1.7vw, 16.5px);
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.8);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(30px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team__panel:hover,
  .page-about .about-team__panel:focus-within {
    transform: translateY(-6px);
    border-color: rgba(183, 243, 74, 0.5);
    box-shadow: 0 22px 42px -30px rgba(183, 243, 74, 0.55);
  }

  .page-about .about-team__detail {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    opacity: 0;
    border-top-color: transparent;
    transition: max-height 0.38s var(--ease), opacity 0.3s var(--ease), margin-top 0.38s var(--ease),
      padding-top 0.38s var(--ease);
  }

  .page-about .about-team__panel:hover .about-team__detail,
  .page-about .about-team__panel:focus-within .about-team__detail {
    max-height: 12em;
    margin-top: 14px;
    padding-top: 12px;
    opacity: 1;
    border-top-color: rgba(138, 155, 184, 0.3);
  }

  .page-about .about-team-aside {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: center;
    margin-top: 34px;
  }

  .page-about .about-timeline {
    gap: 16px;
  }

  .page-about .about-node > summary {
    padding: 18px 56px 18px 24px;
  }

  .page-about .about-node__body {
    padding: 18px 24px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__panel,
  .page-about .about-team__detail,
  .page-about .about-node > summary,
  .page-about .about-node > summary::after,
  .page-about .about-metric {
    transition: none;
  }

  .page-about .about-team__panel:hover,
  .page-about .about-team__panel:focus-within {
    transform: none;
  }
}