.page-about {
  --about-rail-w: 84px;
  --about-ink-soft: #4A4238;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 64px;
  color: var(--cream);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(212, 176, 106, 0.16), transparent 56%),
    radial-gradient(90% 80% at 92% 100%, rgba(18, 61, 50, 0.9), transparent 64%),
    linear-gradient(155deg, #0B2B24 0%, #0C2E26 46%, #123D32 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 249, 239, 0.055) 1px, transparent 1px);
  background-size: 6px 6px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--gold-line) 0 1px, transparent 1px 22px);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  color: rgba(255, 249, 239, 0.66);
  font-size: 0.82rem;
}

.page-about .about-hero .breadcrumb a,
.page-about .about-hero .breadcrumb-link {
  color: rgba(255, 249, 239, 0.82);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible,
.page-about .about-hero .breadcrumb-link:hover {
  color: var(--gold);
}

.page-about .about-eyebrow {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.6vw, 3.85rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .about-h1-sub {
  display: block;
  margin-top: 14px;
  font-size: 0.44em;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-hero-lead {
  margin: 24px 0 0;
  max-width: 34rem;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: rgba(255, 249, 239, 0.84);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px 20px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--gold-line);
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.16rem;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: rgba(255, 249, 239, 0.68);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-actions .btn--outline {
  color: var(--cream);
  border-color: var(--gold-line);
  background: transparent;
}

.page-about .about-actions .btn--outline:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* 首屏抽屉 */
.page-about .about-drawer {
  margin: 0;
  position: relative;
}

.page-about .about-drawer-frame {
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gold-line);
  overflow: hidden;
  box-shadow: 0 44px 70px -46px rgba(0, 0, 0, 0.85);
  background: var(--felt);
  transform: translateY(0);
}

.page-about .about-drawer-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-seal {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 68px;
  height: 68px;
  color: var(--gold);
  opacity: 0.92;
  transform: rotate(-8deg);
}

.page-about .about-vert {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  position: absolute;
  left: 12px;
  bottom: 14px;
  padding: 8px 3px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.26em;
  color: var(--gold);
  background: rgba(11, 43, 36, 0.55);
  border-radius: var(--radius-pill);
}

.page-about .about-drawer-note {
  margin: 16px 0 0;
  font-size: 0.83rem;
  line-height: 1.75;
  color: rgba(255, 249, 239, 0.62);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index-inner {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index-link {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 16px 16px 14px;
  font-size: 0.9rem;
  color: var(--text-soft);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--gold-deep);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-stage {
  position: relative;
}

.page-about .about-stage-inner {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 18px;
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .about-stage-rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.page-about .about-stage-rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: -48px;
  width: 1px;
  transform: translateX(-0.5px);
  background: linear-gradient(180deg, var(--gold-line), var(--gold-line-soft));
}

.page-about .about-stage-num {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--paper);
  color: var(--gold-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

.page-about .about-stage-rail .about-vert {
  position: relative;
  left: auto;
  bottom: auto;
  background: var(--paper);
  color: var(--gold-deep);
  padding: 10px 2px;
  border-radius: 0;
  display: none;
}

.page-about .about-stage-body {
  min-width: 0;
}

.page-about .about-stage-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.page-about .about-stage-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-lead {
  margin: 0 0 30px;
  max-width: 40rem;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .about-cards {
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  position: relative;
  padding: 20px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--cream);
  box-shadow: var(--shadow-lift);
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--red);
  opacity: 0.85;
}

.page-about .about-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-card-note {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0 !important;
  font-size: 0.86rem !important;
  color: var(--gold-deep) !important;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--gold-line);
  box-shadow: var(--shadow-panel);
}

.page-about .about-card:hover .about-card-note,
.page-about .about-card:focus-within .about-card-note,
.page-about .about-card:focus .about-card-note {
  max-height: 8rem;
  opacity: 1;
  margin-top: 10px !important;
}

.page-about .about-card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 深色章节 ---------- */
.page-about .about-stage--dark {
  color: var(--cream);
  background:
    radial-gradient(80% 60% at 88% 0%, rgba(212, 176, 106, 0.14), transparent 62%),
    linear-gradient(165deg, #0B2B24 0%, #10352B 55%, #123D32 100%);
}

.page-about .about-stage--dark .about-stage-title {
  color: var(--cream);
}

.page-about .about-stage--dark .about-lead {
  color: rgba(255, 249, 239, 0.82);
}

.page-about .about-stage--dark .about-stage-kicker {
  color: var(--gold);
}

.page-about .about-stage--dark .about-stage-num {
  background: #0B2B24;
  color: var(--gold);
}

.page-about .about-stage--dark .about-stage-rail::before {
  background: linear-gradient(180deg, rgba(212, 176, 106, 0.5), rgba(212, 176, 106, 0.12));
}

/* ---------- 分段切换 ---------- */
.page-about .about-tabs {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-tab-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-about .about-tab-label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gold-line);
  background: rgba(255, 249, 239, 0.06);
  color: rgba(255, 249, 239, 0.9);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-tab-label:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .about-tab-input:checked + .about-tab-label {
  background: var(--gold);
  border-color: var(--gold);
  color: #0B2B24;
  font-weight: 600;
}

.page-about .about-tab-input:focus-visible + .about-tab-label {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-tab-panels {
  grid-column: 1 / -1;
  margin-top: 8px;
}

.page-about .about-tab-panel {
  display: none;
  padding: 22px 22px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(212, 176, 106, 0.42);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--shadow-panel);
}

.page-about #line-play:checked ~ .about-tab-panels .about-tab-panel--play,
.page-about #line-stand:checked ~ .about-tab-panels .about-tab-panel--stand,
.page-about #line-hand:checked ~ .about-tab-panels .about-tab-panel--hand,
.page-about #line-stat:checked ~ .about-tab-panels .about-tab-panel--stat {
  display: block;
}

.page-about .about-tab-panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
}

.page-about .about-tab-panel p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-panel-list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-panel-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--slate-ink);
}

.page-about .about-panel-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
}

.page-about .about-panel-link {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 2px;
}

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

.page-about .about-lines-foot {
  margin: 26px 0 0;
  padding: 18px 20px;
  max-width: 46rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, 0.78);
  border-left: 2px solid var(--gold);
  background: rgba(255, 249, 239, 0.045);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--cream);
  box-shadow: 0 12px 24px -22px rgba(11, 43, 36, 0.6);
}

.page-about .about-flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--felt);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.page-about .about-flow h3 {
  margin: 2px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-flow-media {
  margin: 28px 0 0;
}

.page-about .about-flow-media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

.page-about .about-flow-media figcaption,
.page-about .about-device-media figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 团队 ---------- */
.page-about .about-stage--tint {
  background: linear-gradient(180deg, rgba(220, 230, 235, 0.7), rgba(242, 235, 221, 0.25));
}

.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-crew-card {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--cream);
  border: 1px solid var(--line);
  border-top: 3px solid var(--slate);
}

.page-about .about-crew-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--ink);
}

.page-about .about-crew-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: rgba(124, 149, 166, 0.34);
  border: 1px solid rgba(124, 149, 166, 0.34);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-figure {
  padding: 18px 16px;
  background: var(--slate-soft);
}

.page-about .about-figure-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.24rem, 3vw, 1.68rem);
  line-height: 1.2;
  color: var(--slate-ink);
  letter-spacing: 0.01em;
}

.page-about .about-figure-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--slate-ink);
  opacity: 0.86;
}

/* ---------- 设备与服务 ---------- */
.page-about .about-device-media {
  margin: 0;
}

.page-about .about-device-media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
}

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

.page-about .about-device-item {
  padding-left: 16px;
  border-left: 2px solid var(--gold-line);
}

.page-about .about-device-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-device-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-service {
  display: grid;
  gap: 18px;
  margin-top: 30px;
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: var(--cream);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
}

.page-about .about-service p {
  margin: 0;
  max-width: 42rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-service .btn {
  justify-self: start;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 56px 0 64px;
  background:
    radial-gradient(90% 80% at 84% 0%, rgba(212, 176, 106, 0.14), transparent 60%),
    linear-gradient(170deg, #0B2B24, #123D32);
  color: var(--cream);
}

.page-about .about-next-title {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 1.95rem);
  color: var(--cream);
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 22px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gold-line);
  background: rgba(255, 249, 239, 0.055);
  color: var(--cream);
  text-decoration: none;
  transition: background 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

.page-about .about-next-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-next-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--cream);
}

.page-about .about-next-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.76);
}

.page-about .about-next-go {
  margin-top: auto;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--gold);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  background: rgba(255, 249, 239, 0.1);
  border-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .about-next-card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-stage-inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: 28px;
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .page-about .about-stage-rail::before {
    bottom: -60px;
  }

  .page-about .about-stage-rail .about-vert {
    display: block;
  }

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

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

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

  .page-about .about-service .btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 56px);
    padding-bottom: 84px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
    gap: 54px;
  }

  .page-about .about-drawer-frame {
    transform: translateY(26px);
  }

  .page-about .about-drawer-note {
    margin-top: 44px;
    max-width: 22rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 30px;
  }

  .page-about .about-split--rev > :first-child {
    order: 2;
  }

  .page-about .about-flow li {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 18px;
    padding: 18px 22px;
  }

  .page-about .about-flow-num {
    width: 42px;
    height: 42px;
  }

  .page-about .about-flow-media {
    margin-top: 32px;
    margin-left: 26px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next {
    padding: 66px 0 76px;
  }

  .page-about .about-tab-panel {
    padding: 26px 26px 22px;
  }
}

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

  .page-about .about-card:hover,
  .page-about .about-next-card:hover {
    transform: none;
  }
}