.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--body-text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 88px 0 68px;
  overflow: hidden;
  border-bottom: var(--border);
  background:
    radial-gradient(120% 80% at 86% 0%, rgba(182, 255, 59, 0.10) 0%, transparent 62%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 58, 92, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 92, 0.30) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(130% 100% at 80% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(130% 100% at 80% 0%, #000 0%, transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero__head {
  max-width: 920px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 8.2vw, 5.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 20px 0 0;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  margin: 28px 0 0;
  max-width: 64ch;
  padding-left: 20px;
  border-left: 3px solid var(--turf);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: var(--body-text);
}

.page-about .about-hero__figure {
  margin: 52px 0 0;
}

.page-about .about-hero__stats {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line-600);
  border: var(--border);
}

.page-about .about-stat {
  background: var(--ink-850);
  padding: 22px 18px;
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--turf);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  position: relative;
  border: var(--border);
  background: linear-gradient(135deg, var(--ink-800), var(--ink-850));
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .media__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 58, 92, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 92, 0.36) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.28;
  pointer-events: none;
}

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

.page-about .media__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--mute);
}

/* ---------- 章节与色带 ---------- */
.page-about .band {
  position: relative;
  padding: 72px 0;
}

.page-about .band--ink {
  background: var(--ink-900);
}

.page-about .band--console {
  background: var(--ink-850);
  border-top: var(--border);
  border-bottom: var(--border);
}

.page-about .band--wine {
  background: linear-gradient(165deg, #55162C 0%, #2B0B17 48%, var(--ink-900) 100%);
  border-top: var(--border);
  border-bottom: var(--border);
}

.page-about .band--violet {
  background: linear-gradient(195deg, #2E1266 0%, #170A33 52%, var(--ink-900) 100%);
  border-bottom: var(--border);
}

.page-about .chapter-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--ink-900);
  background: var(--turf);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
}

.page-about .section-head {
  max-width: 820px;
  margin-bottom: 44px;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.4vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 18px 0 0;
}

.page-about .section-head .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  max-width: 880px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--turf) 0%, var(--amber) 52%, var(--signal) 100%);
  opacity: 0.85;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 28px 40px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--turf);
  box-shadow: 0 0 0 4px rgba(10, 15, 28, 0.92), 0 0 0 5px var(--line-600);
  z-index: 1;
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .plate {
  background: rgba(10, 15, 28, 0.62);
  border: var(--border);
  border-left: 4px solid var(--turf);
  padding: 16px 18px;
  transition: transform 0.3s var(--ease), border-left-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .timeline__item:hover .plate,
.page-about .timeline__item:focus-within .plate {
  transform: translateX(6px);
  border-left-color: var(--amber);
  background: rgba(10, 15, 28, 0.88);
}

.page-about .plate h3 {
  font-family: var(--font-display);
  font-size: 1.18rem;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .plate p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--mute);
}

.page-about .about-timeline__figure {
  margin: 56px 0 0;
  max-width: 880px;
}

/* ---------- 标签页 ---------- */
.page-about .tabs {
  margin-top: 4px;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 20px;
  border-bottom: var(--border);
}

.page-about .tabs__tab {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 2px solid var(--line-600);
  background: transparent;
  color: var(--body-text);
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .tabs__tab:hover {
  border-color: var(--turf);
  color: var(--turf);
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--turf);
  border-color: var(--turf);
  color: var(--ink-900);
}

.page-about .tabs__panel {
  padding-top: 32px;
}

.page-about .tabs__panel[hidden] {
  display: none;
}

.page-about .about-lane {
  display: grid;
  gap: 2px;
  background: var(--line-600);
  border: var(--border);
}

.page-about .about-lane__card {
  background: rgba(10, 15, 28, 0.72);
  padding: 26px 22px 28px;
}

.page-about .about-lane__card h3 {
  font-family: var(--font-display);
  font-size: 1.14rem;
  color: var(--paper);
  margin: 12px 0 10px;
}

.page-about .about-lane__card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.74;
  color: var(--mute);
}

/* ---------- 方法流程 + 折叠面板 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 44px;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 14px;
  padding: 26px 0;
  border-top: var(--border);
}

.page-about .flow__step:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .flow__idx {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 5px;
}

.page-about .flow__step h3 {
  grid-column: 2;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .flow__step p {
  grid-column: 2;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.76;
  color: var(--mute);
}

.page-about .about-faq__title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--amber);
  margin: 0 0 18px;
}

.page-about .disclosure {
  border: var(--border);
  background: var(--ink-850);
}

.page-about .disclosure + .disclosure {
  border-top: none;
}

.page-about .disclosure__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  background: transparent;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .disclosure__trigger:hover {
  color: var(--turf);
  background: rgba(182, 255, 59, 0.05);
}

.page-about .disclosure__mark {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--turf);
}

.page-about .disclosure__panel {
  padding: 0 20px 20px;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mute);
}

.page-about .disclosure__panel[hidden] {
  display: none;
}

.page-about .disclosure__panel p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 44px;
  align-items: center;
}

.page-about .about-crew__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.2vw, 2.7rem);
  line-height: 1.15;
  color: var(--paper);
  margin: 18px 0 0;
}

.page-about .about-crew__text p {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--body-text);
}

.page-about .about-crew__roles {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line-600);
  border: var(--border);
}

.page-about .about-crew__role {
  background: var(--ink-800);
  padding: 20px 18px;
}

.page-about .about-crew__role b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--turf);
}

.page-about .about-crew__role span {
  display: block;
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--mute);
}

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

/* ---------- 合作理由 ---------- */
.page-about .reason-grid {
  display: grid;
  gap: 22px;
}

.page-about .reason {
  position: relative;
  background: var(--ink-850);
  border: var(--border);
  box-shadow: var(--shadow-hard);
  padding: 26px 22px 28px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .reason:hover {
  transform: translate(-3px, -3px);
  border-color: var(--turf);
}

.page-about .reason__idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .reason h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--paper);
  margin: 14px 0 10px;
}

.page-about .reason p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.74;
  color: var(--mute);
}

.page-about .reason a {
  color: var(--turf);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 0 0 88px;
  background: var(--ink-900);
}

.page-about .about-cta__panel {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 38px 26px;
  border: var(--border);
  box-shadow: var(--shadow-hard);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(182, 255, 59, 0.14) 0%, transparent 62%),
    var(--ink-800);
}

.page-about .about-cta__panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.6vw, 2.25rem);
  line-height: 1.18;
  color: var(--paper);
  margin: 0;
}

.page-about .about-cta__panel p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--mute);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-crew__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__stats .about-stat {
    padding: 26px 22px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 112px 0 84px;
  }

  .page-about .band {
    padding: 104px 0;
  }

  .page-about .timeline__item {
    padding-left: 52px;
  }

  .page-about .about-timeline__figure {
    margin-top: 64px;
  }

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

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-crew {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 52px 48px;
  }
}

@media (min-width: 1120px) {
  .page-about .reason-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .plate,
  .page-about .reason,
  .page-about .tabs__tab,
  .page-about .disclosure__trigger {
    transition: none;
  }
}