/* ===== 品牌档案 · 页面作用域 ===== */

.page-about {
  background: var(--ink);
  color: var(--fg);
}

/* ---------- 首屏 ---------- */

.page-about .about-lead {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(44px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -40%;
  width: 44vw;
  height: 44vw;
  max-width: 640px;
  max-height: 640px;
  background: radial-gradient(circle at 40% 40%, rgba(53, 242, 200, .12), transparent 62%);
  pointer-events: none;
}

.page-about .about-lead__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-lead__copy h1 {
  font-family: var(--font-sans);
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.022em;
  font-weight: 800;
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-lead__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.78;
  color: var(--fg-dim);
}

.page-about .about-lead__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-lead__facts > div {
  background: var(--panel);
  padding: 14px 16px 16px;
}

.page-about .about-lead__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--fg-dim);
}

.page-about .about-lead__facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-lead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.2vw, 36px);
}

.page-about .about-lead__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-lead__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-lead__media::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 62%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

/* ---------- 区块标题 ---------- */

.page-about .about-head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .about-head h2 {
  font-family: var(--font-sans);
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 12px 0 0;
}

.page-about .about-head__note {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.74;
  color: var(--fg-dim);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  border-bottom: 1px solid var(--line);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 920px;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) clamp(20px, 3vw, 32px);
  border-left: 1px solid var(--line);
}

.page-about .tl__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__item.is-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 242, 200, .13);
}

.page-about .tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
  padding: 2px 9px;
  border: 1px solid rgba(255, 122, 47, .55);
  margin-bottom: 12px;
}

.page-about .tl__title {
  font-family: var(--font-sans);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: -0.012em;
  margin: 0 0 10px;
  color: var(--fg);
}

.page-about .tl__body {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.74;
  color: var(--fg-dim);
}

.page-about .tl__result {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.68;
  color: var(--fg);
  transition: border-color var(--dur) var(--ease);
}

.page-about .tl__item.is-visible .tl__result {
  border-left-color: var(--cyan);
}

/* ---------- 编辑部分工 ---------- */

.page-about .about-squads {
  border-bottom: 1px solid var(--line);
}

.page-about .about-banner {
  margin: 0 0 clamp(30px, 4vw, 54px);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .squads {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .squad {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--panel);
  padding: clamp(20px, 2.4vw, 30px);
  transition: background var(--dur) var(--ease);
}

.page-about .squad:hover,
.page-about .squad:focus-within,
.page-about .squad:focus {
  background: var(--panel-2);
}

.page-about .squad:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .squad__count {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: clamp(36px, 4.4vw, 52px);
  font-weight: 700;
  line-height: .9;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}

.page-about .squad__count span {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--fg-dim);
}

.page-about .squad__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .squad__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.page-about .squad__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg-dim);
}

.page-about .squad__load {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .squad:hover .squad__load,
.page-about .squad:focus .squad__load,
.page-about .squad:focus-within .squad__load {
  color: var(--cyan);
  border-top-color: var(--cyan);
}

/* ---------- 版本对比表 ---------- */

.page-about .about-rules {
  border-bottom: 1px solid var(--line);
}

.page-about .vtable-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .vtable-wrap:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .vtable {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .vtable caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--line);
}

.page-about .vtable th,
.page-about .vtable td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
  line-height: 1.62;
  border-bottom: 1px solid var(--line);
}

.page-about .vtable thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--fg-dim);
  background: var(--panel);
  white-space: nowrap;
}

.page-about .vtable thead th.is-current {
  color: var(--cyan);
  box-shadow: inset 0 -2px 0 var(--cyan);
}

.page-about .vtable tbody th {
  font-weight: 600;
  color: var(--fg);
  white-space: nowrap;
}

.page-about .vtable tbody td {
  color: var(--fg-dim);
}

.page-about .vtable tbody td.is-current {
  color: var(--fg);
  background: rgba(53, 242, 200, .05);
}

.page-about .vtable tbody tr {
  transition: background var(--dur) var(--ease);
}

.page-about .vtable tbody tr:hover {
  background: var(--panel);
}

.page-about .vtable tbody tr:last-child th,
.page-about .vtable tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 收录规模 ---------- */

.page-about .about-scale {
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-scale__copy .about-head {
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-scale__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-scale__list span {
  color: var(--fg-dim);
}

.page-about .about-scale__list b {
  font-family: var(--font-mono);
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__use {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-scale__use li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg-dim);
}

.page-about .about-scale__use li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-scale__use strong {
  color: var(--fg);
  font-weight: 600;
}

.page-about .about-scale__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-scale__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

/* ---------- 生态与荣誉 ---------- */

.page-about .about-eco {
  border-bottom: 1px solid var(--line);
}

.page-about .plates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .plate {
  position: relative;
  background: var(--panel);
  padding: 24px 24px 26px 34px;
  transition: background var(--dur) var(--ease);
}

.page-about .plate:hover {
  background: var(--panel-2);
}

.page-about .plate::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 28px;
  width: 2px;
  height: 16px;
  background: var(--gold);
}

.page-about .plate:nth-child(2)::before {
  background: var(--cyan);
}

.page-about .plate:nth-child(3)::before {
  background: var(--orange);
}

.page-about .plate:nth-child(4)::before {
  background: var(--violet);
}

.page-about .plate__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--fg-dim);
}

.page-about .plate__title {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.page-about .plate__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* ---------- 合作方式 ---------- */

.page-about .collabs {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.page-about .collab {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(22px, 2.6vw, 32px);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .collab:hover,
.page-about .collab:focus,
.page-about .collab:focus-within {
  border-color: var(--cyan);
  background: var(--panel-2);
}

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

.page-about .collab__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .collab__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 700;
  letter-spacing: -0.014em;
}

.page-about .collab__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--fg-dim);
}

.page-about .collab__audience {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--fg-dim);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .collab:hover .collab__audience,
.page-about .collab:focus .collab__audience,
.page-about .collab:focus-within .collab__audience {
  opacity: 1;
  transform: none;
  color: var(--cyan);
}

.page-about .about-collab__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 22px;
  margin-top: clamp(28px, 3.6vw, 44px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .about-collab__cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* ---------- 触屏与窄屏适配 ---------- */

@media (hover: none) {
  .page-about .collab__audience {
    opacity: 1;
    transform: none;
    color: var(--fg-dim);
  }
}

@media (min-width: 600px) {
  .page-about .about-lead__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .squads {
    grid-template-columns: 1.12fr 1.06fr 1fr .94fr;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-lead__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-scale__media {
    position: sticky;
    top: clamp(24px, 4vw, 48px);
  }
}

@media (max-width: 719px) {
  .page-about .about-lead__media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-banner img {
    aspect-ratio: 16 / 9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
  }

  .page-about .tl__item::before {
    box-shadow: none;
  }

  .page-about .collab__audience {
    transform: none;
  }
}