.page-about {
  --about-line: rgba(168, 199, 209, 0.24);
  --about-glass: rgba(11, 41, 64, 0.62);
  background-color: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 28px) 0 52px;
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(45, 226, 197, 0.18), transparent 62%),
    linear-gradient(180deg, #04141f 0%, #051a2b 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(168, 199, 209, 0.07) 1px, transparent 1px),
    linear-gradient(0deg, rgba(168, 199, 209, 0.05) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 80%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 80%);
}

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

.page-about .about-hero .crumbs {
  margin-bottom: 22px;
}

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

.page-about .about-hero .crumbs li[aria-current="page"] {
  color: var(--cyan);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-h1 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.85rem, 7.2vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 10px 0 16px;
}

.page-about .about-h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-lead {
  max-width: 48ch;
  margin: 0 0 26px;
  color: var(--mist);
  font-size: clamp(0.98rem, 2.4vw, 1.1rem);
  line-height: 1.82;
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 12px;
  background: rgba(4, 20, 31, 0.88);
}

.page-about .about-fact-num {
  font-size: clamp(1.05rem, 3.4vw, 1.4rem);
  color: var(--cyan);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.page-about .about-fact-label {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-hero-media {
  margin: 0;
  box-shadow: 16px 16px 0 rgba(201, 183, 156, 0.14);
}

.page-about .about-hero-media img {
  display: block;
}

/* ---------- 章节导航 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(5, 26, 43, 0.95);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .about-toc-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-label {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

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

.page-about .about-toc a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toc a .mono {
  color: var(--cyan);
  font-size: 11px;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section--deep {
  background: linear-gradient(180deg, #071f32 0%, #0b2940 100%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-sec-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 22px;
}

.page-about .about-sec-num {
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .about-section .h2 {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: clamp(1.4rem, 4.4vw, 2.15rem);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-paper {
  padding: 24px;
}

.page-about .pane--paper .h2,
.page-about .pane--paper .h3 {
  color: var(--ink);
}

.page-about .about-paper .prose p {
  color: rgba(5, 26, 43, 0.82);
  font-size: 15px;
  line-height: 1.85;
}

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

.page-about .about-split {
  margin-top: 18px;
}

.page-about .about-side {
  border-top: 3px solid var(--orange);
  padding-top: 14px;
}

.page-about .about-side-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--teal);
}

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

.page-about .about-side-list li {
  padding-left: 12px;
  border-left: 2px solid rgba(15, 107, 115, 0.35);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(5, 26, 43, 0.85);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-tl-head {
  max-width: 720px;
  margin-bottom: 28px;
}

.page-about .about-tl-note {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-tl-grid {
  gap: 26px;
  align-items: start;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(45, 226, 197, 0.12) 100%);
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 16px 0;
  border: 1px solid var(--about-line);
  border-left: 0;
  background: var(--about-glass);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-node:hover {
  border-color: rgba(45, 226, 197, 0.5);
  background: rgba(11, 41, 64, 0.9);
}

.page-about .about-node-mark {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: #04141f;
  color: var(--cyan);
  font-size: 11px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-node:hover .about-node-mark {
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-node--now {
  border-color: rgba(255, 122, 26, 0.45);
}

.page-about .about-node--now .about-node-mark {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-node--now:hover .about-node-mark {
  background: var(--orange);
  color: var(--ink);
}

.page-about .about-node-body h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-node-body p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-node-more {
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid rgba(45, 226, 197, 0.5);
  font-size: 12.5px;
  color: rgba(168, 199, 209, 0.8);
}

.page-about .about-tl-media {
  margin: 0;
}

.page-about .about-tl-media img {
  display: block;
}

/* ---------- 服务团队 ---------- */
.page-about .about-team {
  padding: 24px;
}

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

.page-about .about-team-cards {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-team-card {
  padding: 16px;
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--teal);
  background: rgba(4, 20, 31, 0.5);
}

.page-about .about-team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-response {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 122, 26, 0.08);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-team-media {
  margin: 0;
}

.page-about .about-team-media img {
  display: block;
}

/* ---------- 内容规模 ---------- */
.page-about .about-scale-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 4px 0 26px;
}

.page-about .about-scale-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 2px solid rgba(5, 26, 43, 0.2);
}

.page-about .about-scale-item--hot {
  border-top-color: var(--orange);
}

.page-about .about-scale-num {
  font-size: clamp(1.6rem, 5.4vw, 2.15rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--teal);
}

.page-about .about-scale-item--hot .about-scale-num {
  color: var(--orange);
}

.page-about .about-scale-label {
  font-size: 12.5px;
  color: rgba(5, 26, 43, 0.65);
}

.page-about .about-note-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-note-grid article {
  padding-top: 14px;
  border-top: 1px solid rgba(5, 26, 43, 0.18);
}

.page-about .about-note-grid h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-note-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(5, 26, 43, 0.78);
}

/* ---------- 服务说明 ---------- */
.page-about .about-service {
  position: relative;
  display: grid;
  gap: 24px;
  padding: 26px;
  border: 1px solid var(--about-line);
  background: linear-gradient(150deg, rgba(11, 41, 64, 0.95) 0%, rgba(4, 20, 31, 0.95) 100%);
  box-shadow: 20px 20px 0 rgba(201, 183, 156, 0.08);
  overflow: hidden;
}

.page-about .about-service::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--cyan) 100%);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-service-side .h3 {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-contact {
  display: grid;
  gap: 14px;
  margin: 14px 0 0;
}

.page-about .about-contact > div {
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(168, 199, 209, 0.22);
}

.page-about .about-contact dt {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-contact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact-note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-next {
  display: grid;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-next a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--about-line);
  background: rgba(11, 41, 64, 0.4);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-next a .mono {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  border-color: var(--cyan);
  background: rgba(45, 226, 197, 0.08);
}

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

  .page-about .about-scale-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 44px) 0 68px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 40px;
  }

  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-paper {
    padding: 40px;
  }

  .page-about .about-team {
    padding: 36px;
  }

  .page-about .about-split {
    grid-template-columns: 1.45fr 0.85fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-note-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 32px;
  }

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

@media (min-width: 900px) {
  .page-about .about-service {
    grid-template-columns: 1.25fr 0.85fr;
    gap: 40px;
    padding: 42px;
  }
}

@media (min-width: 960px) {
  .page-about .about-team-grid {
    grid-template-columns: 1.4fr 0.8fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-tl-grid {
    grid-template-columns: 1.4fr 0.8fr;
    gap: 36px;
  }

  .page-about .about-tl-media {
    position: sticky;
    top: calc(var(--header-h) + 70px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node-mark,
  .page-about .about-toc a,
  .page-about .about-next a {
    transition: none;
  }
}