.page-about {
  --about-line: rgba(255, 255, 255, 0.09);
  --about-hero-gradient: linear-gradient(180deg, rgba(26, 11, 46, 0.1) 0%, rgba(26, 11, 46, 0.6) 58%, rgba(20, 8, 33, 0.96) 100%);
  background-color: #150826;
  color: var(--ink);
  overflow-x: hidden;
}

/* ===== Hero ===== */
.about-hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
}

.about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-hero-gradient);
}

.about-hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 52px 0 40px;
}

.about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--neon);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.about-hero__title {
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: #fff;
  margin: 0 0 16px;
  position: relative;
  padding-bottom: 16px;
}

.about-hero__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: var(--yellow);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.45);
}

.about-hero__lead {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 580px;
  margin: 0;
}

/* ===== 本站简介 ===== */
.about-intro {
  display: grid;
  gap: 28px;
}

.about-intro__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.about-stat {
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: 22px 16px;
  text-align: center;
  transition: border-color 0.18s ease;
}

.about-stat:hover {
  border-color: var(--line);
}

.about-stat__value {
  display: block;
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1;
  color: var(--yellow);
}

.about-stat:nth-child(2) .about-stat__value {
  color: var(--cyan);
}

.about-stat:nth-child(3) .about-stat__value {
  color: var(--orange);
}

.about-stat:nth-child(4) .about-stat__value {
  color: var(--neon);
}

.about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.about-intro__copy p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 14px;
}

.about-intro__copy .btn {
  margin-top: 8px;
}

/* ===== 收录范围 ===== */
.about-scope {
  display: grid;
  gap: 16px;
}

.scope-card {
  border-radius: var(--radius);
  padding: 22px;
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.scope-card:hover {
  transform: translateY(-2px);
  border-color: var(--line);
}

.scope-card--type {
  border-top: 3px solid var(--yellow);
}

.scope-card--region {
  border-top: 3px solid var(--cyan);
}

.scope-card--year {
  border-top: 3px solid var(--orange);
}

.scope-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.scope-card__glyph {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.scope-card--type .scope-card__glyph {
  background: var(--yellow);
  color: #1a0b2e;
}

.scope-card--region .scope-card__glyph {
  background: var(--cyan);
  color: #002b30;
}

.scope-card--year .scope-card__glyph {
  background: var(--orange);
  color: #fff;
}

.scope-card__head h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: #fff;
}

.scope-card__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  white-space: nowrap;
}

.scope-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scope-card__years {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scope-card__years span {
  display: inline-block;
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--ink);
  transition: border-color 0.18s ease;
}

.scope-card__years span:hover {
  border-color: var(--orange);
}

/* ===== 分类与标签体系 ===== */
.about-taxonomy {
  display: grid;
  gap: 24px;
}

.taxonomy-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel-1);
}

.taxonomy-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.taxonomy-figure figcaption,
.about-update__visual figcaption {
  padding: 10px 14px;
  font-size: 0.73rem;
  font-family: var(--font-mono);
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
}

.taxonomy-columns {
  display: grid;
  gap: 12px;
  align-content: start;
}

.taxonomy-dim {
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  overflow: hidden;
}

.taxonomy-dim[open] {
  border-color: var(--line);
}

.taxonomy-dim summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  position: relative;
  background: rgba(255, 255, 255, 0.02);
}

.taxonomy-dim summary::-webkit-details-marker {
  display: none;
}

.taxonomy-dim summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.taxonomy-dim summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 1rem;
  color: var(--neon);
}

.taxonomy-dim[open] summary::after {
  content: "−";
}

.taxonomy-dim__title {
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
}

.taxonomy-dim__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--neon);
  padding-right: 24px;
}

.taxonomy-dim--type .taxonomy-dim__title {
  color: var(--yellow);
}

.taxonomy-dim--region .taxonomy-dim__title {
  color: var(--cyan);
}

.taxonomy-dim--year .taxonomy-dim__title {
  color: var(--orange);
}

.taxonomy-dim__list {
  list-style: none;
  margin: 0;
  padding: 4px 18px 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.taxonomy-dim__list li {
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 8px 6px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink);
}

.about-tagwall {
  margin-top: 28px;
}

.about-tagwall__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.about-tagwall__head h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: #fff;
}

.about-tagwall__count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--neon);
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ===== 更新与批次 ===== */
.about-update {
  display: grid;
  gap: 24px;
}

.about-update__visual {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel-1);
}

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

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

.update-item {
  display: flex;
  gap: 14px;
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: 16px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

@media (hover: hover) {
  .update-item:hover {
    transform: translateY(-2px);
    border-color: var(--line);
  }
}

.update-item__day {
  flex: 0 0 52px;
  height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.update-item--friday .update-item__day {
  background: var(--orange);
  color: #fff;
}

.update-item--saturday .update-item__day {
  background: var(--cyan);
  color: #002b30;
}

.update-item--format .update-item__day {
  background: var(--neon);
  color: #062800;
}

.update-item__body h3 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
}

.update-item__batch {
  display: inline-block;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--neon);
  margin-bottom: 8px;
}

.update-item__body p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ===== 检索与访问 ===== */
.about-access {
  padding-top: 4px;
}

.access-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: access-step;
}

.access-step {
  display: flex;
  gap: 16px;
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: 20px 18px;
  transition: border-color 0.18s ease;
}

.access-step:hover {
  border-color: var(--line);
}

.access-step__num {
  flex: 0 0 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  background: var(--yellow);
  color: #1a0b2e;
}

.access-step:nth-child(2) .access-step__num {
  background: var(--cyan);
  color: #002b30;
}

.access-step:nth-child(3) .access-step__num {
  background: var(--orange);
  color: #fff;
}

.access-step:nth-child(4) .access-step__num {
  background: var(--neon);
  color: #062800;
}

.access-step__body h3 {
  margin: 0 0 5px;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
}

.access-step__body p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.68;
  color: var(--muted);
}

/* ===== 平板以上 ===== */
@media (min-width: 768px) {
  .about-hero {
    min-height: 500px;
  }

  .about-hero__content {
    padding: 80px 0 52px;
  }

  .about-intro {
    grid-template-columns: 1fr 1.05fr;
    align-items: center;
    gap: 40px;
  }

  .about-intro__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-scope {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-taxonomy {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .about-tagwall {
    grid-column: 1 / -1;
  }

  .about-update {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 40px;
  }

  .access-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 桌面 ===== */
@media (min-width: 1100px) {
  .about-intro__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .access-steps {
    grid-template-columns: repeat(4, 1fr);
    align-items: stretch;
  }

  .access-step {
    flex-direction: column;
    gap: 14px;
    padding: 24px 20px;
  }

  .access-step__num {
    flex: 0 0 40px;
    width: 40px;
    height: 40px;
  }

  .about-update {
    gap: 56px;
  }
}