/* ===== 关于本站页 · 页面专属样式 ===== */
.page-about {
  --about-yellow: var(--c-yellow);
  --about-coral: var(--c-coral);
  --about-teal: var(--c-teal);
  --about-pink: var(--c-pink);
  --about-cream: var(--c-cream);
  --about-dark: var(--c-dark);
}

/* ---------- 首屏横幅 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 18% 24%, rgba(255, 42, 157, 0.22), transparent 28%),
    radial-gradient(circle at 85% 82%, rgba(0, 168, 150, 0.18), transparent 32%);
  z-index: 0;
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: 28px;
  padding: 28px 0 64px;
}

.page-about .about-hero__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--about-pink);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--about-yellow);
  text-shadow: 4px 4px 0 rgba(255, 42, 157, 0.26);
}

.page-about .about-hero__lead {
  margin: 0 0 22px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 240, 230, 0.88);
  max-width: 640px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  max-width: 640px;
}

.page-about .about-hero__fact {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 14px 16px;
  border-left: 4px solid var(--about-pink);
}

.page-about .about-hero__fact dt {
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(245, 240, 230, 0.68);
  margin: 0 0 4px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--about-yellow);
}

.page-about .about-hero__anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero__anchors a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid rgba(245, 240, 230, 0.24);
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  text-decoration: none;
  color: var(--about-cream);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-hero__anchors a:hover {
  background: var(--about-pink);
  border-color: var(--about-pink);
  color: #ffffff;
}

.page-about .about-hero__visual {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 2px solid rgba(245, 240, 230, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  top: 14px;
  left: -30px;
  width: 140px;
  height: 32px;
  background: var(--about-coral);
  transform: rotate(-38deg);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.28);
  z-index: 2;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__visual-caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  margin: 0;
  padding: 5px 12px;
  background: rgba(0, 0, 0, 0.55);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-cream);
}

/* ---------- 收录范围 ---------- */
.page-about .about-scope {
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--about-pink);
}

.page-about .about-scope::after {
  content: "ARCHIVES · 20,000";
  position: absolute;
  right: 2%;
  bottom: 14%;
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 110px);
  font-weight: 800;
  letter-spacing: -0.05em;
  white-space: nowrap;
  color: rgba(245, 240, 230, 0.08);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-scope .content-wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-scope__intro {
  margin: 0 0 30px;
  max-width: 760px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 240, 230, 0.88);
}

.page-about .about-scope__columns {
  display: grid;
  gap: 18px;
}

.page-about .about-scope__block {
  background: rgba(0, 0, 0, 0.16);
  border-radius: 20px;
  padding: 20px;
}

.page-about .about-scope__subtitle {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--about-yellow);
}

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

.page-about .about-scope__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 54px;
  align-items: center;
  gap: 12px;
}

.page-about .about-scope__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--about-cream);
}

.page-about .about-scope__track {
  height: 12px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.24);
  overflow: hidden;
}

.page-about .about-scope__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .about-scope__item:nth-child(3n + 1) .about-scope__fill {
  background: var(--about-yellow);
}

.page-about .about-scope__item:nth-child(3n + 2) .about-scope__fill {
  background: var(--about-coral);
}

.page-about .about-scope__item:nth-child(3n) .about-scope__fill {
  background: var(--about-teal);
}

.page-about .about-scope__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  text-align: right;
  color: var(--about-yellow);
}

.page-about .about-scope__side {
  display: grid;
  gap: 18px;
}

.page-about .about-scope__region,
.page-about .about-scope__year {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-scope__region li,
.page-about .about-scope__year li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  border-bottom: 1px dashed rgba(245, 240, 230, 0.3);
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--about-cream);
}

.page-about .about-scope__region li:last-child,
.page-about .about-scope__year li:last-child {
  border-bottom: 0;
}

.page-about .about-scope__region strong,
.page-about .about-scope__year strong {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--about-coral);
}

/* ---------- 分类标签体系 ---------- */
.page-about .about-taxonomy {
  border-top: 4px solid var(--about-yellow);
}

.page-about .about-taxonomy__layout {
  display: grid;
  gap: 22px;
  margin-bottom: 30px;
}

.page-about .about-taxonomy__desc {
  display: grid;
  gap: 12px;
  align-content: center;
}

.page-about .about-taxonomy__desc p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  color: rgba(245, 240, 230, 0.9);
}

.page-about .about-taxonomy__chart {
  margin: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 2px solid rgba(245, 240, 230, 0.18);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.18);
}

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

.page-about .about-taxonomy__tree {
  margin-bottom: 30px;
}

.page-about .about-taxonomy__tree-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-yellow);
}

.page-about .about-taxonomy__svg {
  display: block;
  width: 100%;
  height: auto;
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed rgba(245, 240, 230, 0.24);
  border-radius: 18px;
}

.page-about .about-taxonomy__svg line {
  stroke: rgba(245, 240, 230, 0.6);
  stroke-width: 2;
}

.page-about .about-tree__node text {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  pointer-events: none;
}

.page-about .about-tree__node .about-tree__text-sub {
  font-size: 11px;
  font-family: var(--font-mono);
  opacity: 0.86;
}

.page-about .about-tree__node--root rect {
  fill: var(--about-pink);
}

.page-about .about-tree__node--root text {
  fill: #ffffff;
}

.page-about .about-tree__node--teal rect {
  fill: var(--about-teal);
}

.page-about .about-tree__node--teal text {
  fill: var(--about-cream);
}

.page-about .about-tree__node--coral rect {
  fill: var(--about-coral);
}

.page-about .about-tree__node--coral text {
  fill: var(--about-dark);
}

.page-about .about-tree__node--yellow rect {
  fill: var(--about-yellow);
}

.page-about .about-tree__node--yellow text {
  fill: var(--about-dark);
}

@media (hover: hover) {
  .page-about .about-tree__node {
    transition: transform 0.25s ease;
    transform-box: fill-box;
    transform-origin: center;
  }

  .page-about .about-tree__node:hover {
    transform: scale(1.12);
  }
}

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

.page-about .about-taxonomy__group {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 16px;
  border-top: 4px solid var(--about-yellow);
}

.page-about .about-taxonomy__group:nth-child(4n + 1) {
  border-top-color: var(--about-yellow);
}

.page-about .about-taxonomy__group:nth-child(4n + 2) {
  border-top-color: var(--about-coral);
}

.page-about .about-taxonomy__group:nth-child(4n + 3) {
  border-top-color: var(--about-teal);
}

.page-about .about-taxonomy__group:nth-child(4n) {
  border-top-color: var(--about-pink);
}

.page-about .about-taxonomy__group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .about-taxonomy__type {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
}

.page-about .about-taxonomy__group:nth-child(4n + 1) .about-taxonomy__type {
  background: var(--about-yellow);
  color: var(--about-dark);
}

.page-about .about-taxonomy__group:nth-child(4n + 2) .about-taxonomy__type {
  background: var(--about-coral);
  color: var(--about-dark);
}

.page-about .about-taxonomy__group:nth-child(4n + 3) .about-taxonomy__type {
  background: var(--about-teal);
  color: var(--about-cream);
}

.page-about .about-taxonomy__group:nth-child(4n) .about-taxonomy__type {
  background: var(--about-pink);
  color: #ffffff;
}

.page-about .about-taxonomy__count {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--about-cream);
  opacity: 0.78;
}

.page-about .about-taxonomy__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 更新机制 ---------- */
.page-about .about-updates {
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--about-pink);
}

.page-about .about-updates::after {
  content: "BATCH · 100";
  position: absolute;
  right: 2%;
  bottom: 10%;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 100px);
  font-weight: 800;
  letter-spacing: -0.05em;
  white-space: nowrap;
  color: rgba(245, 240, 230, 0.07);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-updates .content-wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-updates__layout {
  display: grid;
  gap: 18px;
}

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

.page-about .about-updates__step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 16px;
}

.page-about .about-updates__step-num {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgba(255, 42, 157, 0.16);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  color: var(--about-pink);
}

.page-about .about-updates__step-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--about-yellow);
}

.page-about .about-updates__step-body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(245, 240, 230, 0.84);
}

.page-about .about-updates__status {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-updates__status-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.page-about .about-updates__status-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(245, 240, 230, 0.86);
}

.page-about .about-updates__note {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 6px solid var(--about-pink);
  border-radius: 0 14px 14px 0;
  background: rgba(255, 255, 255, 0.07);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-cream);
}

/* ---------- 终端适配与播放设置 ---------- */
.page-about .about-terminal {
  border-top: 4px solid var(--about-coral);
  color: var(--about-dark);
}

.page-about .about-terminal__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-terminal__intro p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-dark);
  max-width: 720px;
}

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

.page-about .about-terminal__feature {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  background: #ffffff;
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow-card);
}

.page-about .about-terminal__feature-index {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 800;
  color: var(--about-dark);
}

.page-about .about-terminal__feature--v32 .about-terminal__feature-index {
  background: var(--about-pink);
  color: #ffffff;
}

.page-about .about-terminal__feature--srt .about-terminal__feature-index {
  background: var(--about-yellow);
}

.page-about .about-terminal__feature--quality .about-terminal__feature-index {
  background: var(--about-teal);
  color: #ffffff;
}

.page-about .about-terminal__feature--status .about-terminal__feature-index {
  background: var(--about-coral);
}

.page-about .about-terminal__feature-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--about-dark);
}

.page-about .about-terminal__feature-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: #555555;
}

.page-about .about-terminal__visual {
  margin: 0;
  background: var(--about-dark);
  border: 4px solid #ffffff;
  border-radius: 22px;
  padding: 14px;
  box-shadow: var(--shadow-hover);
  transform: rotate(-1deg);
}

.page-about .about-terminal__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: 10px;
}

.page-about .about-terminal__visual-caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-cream);
  text-align: center;
}

/* ---------- 访问指引 ---------- */
.page-about .about-guide {
  border-top: 4px solid var(--about-teal);
}

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

.page-about .about-guide__card {
  display: block;
  background: #ffffff;
  border-radius: 18px;
  padding: 22px;
  color: var(--about-dark);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

@media (hover: hover) {
  .page-about .about-guide__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
  }
}

.page-about .about-guide__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 10px;
}

.page-about .about-guide__card--catalog .about-guide__num {
  color: var(--about-pink);
}

.page-about .about-guide__card--timeline .about-guide__num {
  color: var(--c-blue);
}

.page-about .about-guide__card--faq .about-guide__num {
  color: var(--about-teal);
}

.page-about .about-guide__title {
  display: block;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--about-dark);
}

.page-about .about-guide__text {
  display: block;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: #555555;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    padding: 40px 0 80px;
  }

  .page-about .about-scope__columns {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-scope__side {
    grid-template-columns: 1fr;
  }

  .page-about .about-taxonomy__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-updates__layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .about-updates__status {
    grid-template-columns: 1fr;
  }

  .page-about .about-terminal__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-taxonomy__labels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}