.page-about {
  --about-deep: var(--c-purple);
  --about-orange: var(--c-orange);
  --about-cream: var(--c-cream);
  --about-blue: var(--c-blue);
  --about-magenta: var(--c-magenta);
  --about-green: var(--c-green);
  --about-gold: var(--c-gold);
  --about-ink: var(--c-ink);
  --about-line: var(--c-line);
  --about-muted: var(--c-muted);
  --about-lavender: var(--c-lavender);
  background: var(--about-cream);
  color: var(--about-ink);
}

/* ==== Hero ==== */
.page-about .about-hero {
  position: relative;
  padding: 44px 0 56px;
  background:
    radial-gradient(circle at 78% 18%, rgba(230, 126, 34, 0.28) 0%, transparent 46%),
    var(--about-deep);
  border-bottom: 4px solid var(--about-gold);
  overflow: hidden;
}

.page-about .about-hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: none;
  opacity: 0.2;
  mix-blend-mode: screen;
  pointer-events: none;
}

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

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin-bottom: 20px;
  font-size: 13px;
  font-family: var(--font-body);
  color: rgba(253, 246, 227, 0.7);
}

.page-about .about-crumbs a {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.page-about .about-crumbs a:hover {
  border-bottom-color: var(--about-gold);
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--about-gold);
  background: rgba(241, 196, 15, 0.1);
  border: 1px solid rgba(241, 196, 15, 0.35);
  padding: 5px 14px;
  border-radius: 4px;
  margin-bottom: 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-title);
  font-size: var(--h1);
  line-height: 1.12;
  color: var(--about-cream);
  margin: 0 0 18px;
  max-width: 780px;
  text-shadow: 0 3px 20px rgba(0, 0, 0, 0.45);
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(253, 246, 227, 0.85);
  max-width: 640px;
  margin: 0 0 22px;
}

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

.page-about .about-hero__pill {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: rgba(253, 246, 227, 0.85);
  border: 1px solid rgba(253, 246, 227, 0.28);
  background: rgba(253, 246, 227, 0.06);
  padding: 5px 12px;
  border-radius: 999px;
}

.page-about .about-hero__pill--gold {
  color: var(--about-gold);
  border-color: rgba(241, 196, 15, 0.45);
  background: rgba(241, 196, 15, 0.1);
}

/* ==== 区块标题 ==== */
.page-about .about-sec-head {
  margin-bottom: 26px;
}

.page-about .about-sec-head__label {
  display: block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--about-orange);
  margin-bottom: 6px;
}

.page-about .about-sec-head h2 {
  font-family: var(--font-title);
  font-size: var(--h2);
  color: var(--about-deep);
  margin: 0 0 4px;
}

.page-about .about-sec-head p {
  font-size: 13px;
  color: var(--about-muted);
  margin: 0;
}

/* ==== 站点定位 ==== */
.page-about .about-position {
  padding: 48px 0 56px;
  background: var(--about-cream);
}

.page-about .about-position__quote {
  position: relative;
  border-left: 6px solid var(--about-orange);
  background: linear-gradient(135deg, rgba(230, 126, 34, 0.1) 0%, rgba(45, 27, 78, 0.06) 100%);
  padding: 28px 24px 24px;
  border-radius: 0 10px 10px 0;
}

.page-about .about-position__tab {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--about-cream);
  background: var(--about-deep);
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 14px;
}

.page-about .about-position__quote blockquote {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.25;
  color: var(--about-deep);
}

.page-about .about-position__quote p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted);
  margin: 0 0 18px;
  max-width: 820px;
}

/* ==== 数据快照 ==== */
.page-about .about-stats-section {
  padding: 48px 0 44px;
  background:
    repeating-linear-gradient(0deg, rgba(253, 246, 227, 0.02) 0 1px, transparent 1px 3px),
    linear-gradient(135deg, rgba(45, 27, 78, 0.94) 0%, rgba(230, 126, 34, 0.14) 100%),
    var(--about-deep);
  border-top: 4px solid var(--about-orange);
  border-bottom: 4px solid var(--about-orange);
}

.page-about .about-stats-section .about-sec-head__label {
  color: var(--about-gold);
}

.page-about .about-stats-section .about-sec-head h2 {
  color: var(--about-cream);
}

.page-about .about-stats-section .about-sec-head p {
  color: rgba(253, 246, 227, 0.6);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 28px 0 22px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 168px;
  padding: 22px 20px;
  border-radius: 8px;
  border: 1px solid rgba(253, 246, 227, 0.12);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 26px rgba(0, 0, 0, 0.32);
}

.page-about .about-stat--deep {
  background: linear-gradient(135deg, #22103f 0%, #3a2367 100%);
}

.page-about .about-stat--orange {
  background: linear-gradient(135deg, #e67e22 0%, #cd6515 100%);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-body);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-cream);
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  display: block;
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--about-cream);
  margin-top: 14px;
}

.page-about .about-stat__desc {
  display: block;
  font-size: 12px;
  line-height: 1.55;
  color: rgba(253, 246, 227, 0.75);
  margin-top: 6px;
}

.page-about .about-stats-section__chart {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(253, 246, 227, 0.14);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.22);
}

/* ==== 分类体系 ==== */
.page-about .about-taxonomy-section {
  padding: 48px 0 56px;
  background: var(--about-cream);
}

.page-about .about-taxonomy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-tree {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-tree details {
  background: #fff;
  border: 1px solid var(--about-line);
  border-radius: 8px;
  padding: 12px 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-tree details:hover {
  border-color: var(--about-blue);
}

.page-about .about-tree details[open] {
  border-color: var(--about-blue);
  box-shadow: 0 4px 12px rgba(41, 128, 185, 0.14);
}

.page-about .about-tree summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--about-deep);
}

.page-about .about-tree summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tree__arrow {
  margin-left: auto;
  font-size: 14px;
  line-height: 1;
  transition: color 0.15s;
}

.page-about .about-tree__arrow::before {
  content: "▸";
  color: var(--about-orange);
}

.page-about .about-tree details[open] .about-tree__arrow::before {
  content: "▾";
  color: var(--about-green);
}

.page-about .about-tree__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.page-about .about-tree__dot--blue { background: var(--about-blue); }
.page-about .about-tree__dot--magenta { background: var(--about-magenta); }
.page-about .about-tree__dot--green { background: var(--about-green); }
.page-about .about-tree__dot--gold { background: var(--about-gold); }
.page-about .about-tree__dot--purple { background: var(--about-lavender); }
.page-about .about-tree__dot--orange { background: var(--about-orange); }
.page-about .about-tree__dot--gray { background: var(--c-gray); }

.page-about .about-tree ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 2px 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-tree li {
  margin: 0;
}

.page-about .about-tree .tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 4px;
}

.page-about .about-tree .tag--blue { background: rgba(41, 128, 185, 0.12); color: #1a5d85; }
.page-about .about-tree .tag--magenta { background: rgba(192, 57, 43, 0.12); color: #982d21; }
.page-about .about-tree .tag--green { background: rgba(39, 174, 96, 0.12); color: #1a7a42; }
.page-about .about-tree .tag--gold { background: rgba(241, 196, 15, 0.18); color: #8a6d0a; }
.page-about .about-tree .tag--purple { background: rgba(75, 58, 107, 0.14); color: #3c2a54; }
.page-about .about-tree .tag--gray { background: rgba(127, 140, 141, 0.14); color: #566262; }
.page-about .about-tree .tag--orange { background: rgba(230, 126, 34, 0.14); color: #b45c10; }

.page-about .about-taxonomy__side {
  align-self: start;
}

.page-about .about-tree__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--about-line);
  box-shadow: 0 6px 16px rgba(45, 27, 78, 0.12);
}

/* ==== 更新机制 ==== */
.page-about .about-batch-section {
  padding: 48px 0 44px;
  background:
    repeating-linear-gradient(0deg, rgba(45, 27, 78, 0.03) 0 1px, transparent 1px 3px),
    linear-gradient(135deg, #e67e22 0%, #ba3a2c 100%);
  border-top: 4px solid var(--about-deep);
  border-bottom: 4px solid var(--about-deep);
}

.page-about .about-batch-section .about-sec-head__label {
  color: var(--about-cream);
}

.page-about .about-batch-section .about-sec-head h2 {
  color: #fff;
}

.page-about .about-batch-section .about-sec-head p {
  color: rgba(253, 246, 227, 0.72);
}

.page-about .about-batch {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-batch__card {
  background: var(--about-cream);
  border-radius: 10px;
  padding: 24px;
  border: 1px solid rgba(45, 27, 78, 0.08);
  border-top: 5px solid var(--about-deep);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.14);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-batch__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.2);
}

.page-about .about-batch__card:nth-child(2) {
  border-top-color: var(--about-green);
}

.page-about .about-batch__card:nth-child(3) {
  border-top-color: var(--about-blue);
}

.page-about .about-batch__tag {
  display: inline-block;
  font-size: 11px;
  font-family: var(--font-body);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--about-muted);
  background: rgba(45, 27, 78, 0.06);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.page-about .about-batch__value {
  display: block;
  font-family: var(--font-body);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-deep);
  margin-bottom: 8px;
}

.page-about .about-batch__card h3 {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--about-deep);
  margin: 0 0 8px;
}

.page-about .about-batch__card p {
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-muted);
  margin: 0;
}

.page-about .about-batch__extra {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  margin-top: 18px;
  padding: 14px 18px;
  background: rgba(253, 246, 227, 0.88);
  border-radius: 8px;
  font-size: 13px;
  color: var(--about-deep);
}

/* ==== 版本与终端 ==== */
.page-about .about-versions-section {
  padding: 48px 0 56px;
  background:
    repeating-linear-gradient(0deg, rgba(253, 246, 227, 0.02) 0 1px, transparent 1px 3px),
    radial-gradient(circle at 82% 18%, rgba(230, 126, 34, 0.16) 0%, transparent 46%),
    var(--about-deep);
  border-bottom: 4px solid var(--about-orange);
}

.page-about .about-versions-section .about-sec-head__label {
  color: var(--about-gold);
}

.page-about .about-versions-section .about-sec-head h2 {
  color: var(--about-cream);
}

.page-about .about-versions-section .about-sec-head p {
  color: rgba(253, 246, 227, 0.6);
}

.page-about .about-timeline {
  position: relative;
  max-width: 760px;
  margin-top: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 1px;
  background: rgba(253, 246, 227, 0.25);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 5px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--about-blue);
  border: 2px solid var(--about-cream);
  box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.35);
  z-index: 1;
}

.page-about .about-timeline__node--live {
  background: var(--about-green);
  box-shadow: 0 0 0 4px rgba(39, 174, 96, 0.4);
}

.page-about .about-timeline__card {
  background: rgba(253, 246, 227, 0.08);
  border: 1px solid rgba(253, 246, 227, 0.14);
  border-left: 3px solid var(--about-blue);
  border-radius: 0 10px 10px 0;
  padding: 18px 22px;
  transition: background 0.15s ease;
}

.page-about .about-timeline__card:hover {
  background: rgba(253, 246, 227, 0.13);
}

.page-about .about-timeline__card--live {
  border-left-color: var(--about-green);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-title);
  font-size: 26px;
  color: var(--about-cream);
  margin: 8px 0 6px;
}

.page-about .about-timeline__card p {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(253, 246, 227, 0.8);
  margin: 0 0 10px;
}

.page-about .about-timeline__link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-bottom-color 0.15s;
}

.page-about .about-timeline__link:hover {
  border-bottom-color: var(--about-gold);
}

/* ==== 访问方式 ==== */
.page-about .about-access-section {
  padding: 48px 0 60px;
  background: var(--about-cream);
}

.page-about .about-access {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-access__card {
  display: block;
  background: #fff;
  border: 1px solid var(--about-line);
  border-radius: 10px;
  padding: 20px 18px;
  text-decoration: none;
  color: var(--about-ink);
  box-shadow: 0 2px 6px rgba(45, 27, 78, 0.06);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-access__card:hover,
.page-about .about-access__card:focus-visible {
  border-color: var(--about-blue);
  transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(45, 27, 78, 0.14);
  outline: none;
}

.page-about .about-access__num {
  display: block;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  color: var(--about-orange);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.page-about .about-access__title {
  display: block;
  font-family: var(--font-title);
  font-size: 19px;
  color: var(--about-deep);
  margin-bottom: 6px;
}

.page-about .about-access__desc {
  display: block;
  font-size: 12px;
  line-height: 1.55;
  color: var(--about-muted);
}

/* ==== 响应式 ==== */
@media (min-width: 600px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

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

@media (min-width: 1000px) {
  .page-about .about-taxonomy__grid {
    grid-template-columns: 1fr 280px;
  }

  .page-about .about-tree__img {
    position: sticky;
    top: 90px;
  }

  .page-about .about-access {
    grid-template-columns: repeat(5, 1fr);
  }
}