/* ===================== 品牌介绍页 ===================== */
.page-about {
  --about-axis-x: 26px;
  --about-lane-pad: 22px;
}

/* ---------- 面包屑 ---------- */
.page-about .page-about-crumb {
  padding-top: 26px;
}

.page-about .page-about-crumb .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--rock);
}

.page-about .page-about-crumb .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .page-about-crumb .breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .page-about-crumb .breadcrumbs a:hover,
.page-about .page-about-crumb .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .page-about-hero {
  padding-top: 34px;
}

.page-about .page-about-hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .page-about-hero-copy h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 8vw, 54px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--warm);
  max-width: 17ch;
}

.page-about .page-about-hero-copy .lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .page-about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .page-about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .page-about-hero-meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .page-about-hero-meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  flex: none;
}

.page-about .page-about-hero-meta li:nth-child(2)::before {
  background: var(--orange);
}

.page-about .page-about-hero-meta li:nth-child(3)::before {
  background: var(--slate);
}

.page-about .page-about-hero-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
  box-shadow: var(--shadow-panel);
}

.page-about .page-about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  opacity: .84;
}

/* ---------- 通用章节头 ---------- */
.page-about .page-about-head {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.page-about .page-about-head .index-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .page-about-head h2 {
  margin: 0;
  font-size: clamp(23px, 4.8vw, 34px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--warm);
  max-width: 24ch;
}

.page-about .page-about-head .lede {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .page-about-note {
  margin-top: 22px;
}

/* ---------- 01 使用人群 ---------- */
.page-about .page-about-position-grid {
  display: grid;
  gap: 16px;
}

.page-about .page-about-lane {
  position: relative;
  padding: var(--about-lane-pad) 20px var(--about-lane-pad) 24px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .page-about-lane::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  border-radius: 2px;
  background: var(--lane-color, var(--cyan));
}

.page-about .page-about-lane:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 243, 224, .42);
}

.page-about .page-about-lane--rank { --lane-color: var(--cyan); }
.page-about .page-about-lane--preview { --lane-color: var(--orange); }
.page-about .page-about-lane--doc { --lane-color: var(--slate); }
.page-about .page-about-lane--service { --lane-color: var(--clay); }

.page-about .page-about-lane-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--warm);
}

.page-about .page-about-lane p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 02 版本轴 ---------- */
.page-about .page-about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .page-about-axis-svg {
  display: block;
  width: 100%;
  height: 60px;
  color: var(--line);
  margin-bottom: 26px;
}

.page-about .page-about-versions {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .page-about-versions::before {
  content: "";
  position: absolute;
  left: var(--about-axis-x);
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--cyan) 0%,
    var(--line) 38%,
    var(--line) 100%);
  pointer-events: none;
}

.page-about .page-about-version {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.page-about .page-about-marker {
  position: relative;
  z-index: 1;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink-900);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--slate);
  transition: border-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .page-about-version:hover .page-about-marker,
.page-about .page-about-version:focus-within .page-about-marker {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 243, 224, .08);
}

.page-about .page-about-version-panel {
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .page-about-version:hover .page-about-version-panel,
.page-about .page-about-version:focus-within .page-about-version-panel {
  transform: translateY(-2px);
  border-color: rgba(47, 243, 224, .45);
}

.page-about .page-about-version-panel .panel-title {
  font-size: clamp(18px, 3.4vw, 22px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.02em;
}

.page-about .page-about-version-panel p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .page-about-version-panel--cream {
  background: var(--cream);
  border-color: rgba(11, 22, 38, .16);
  color: var(--ink-900);
}

.page-about .page-about-version-panel--cream .panel-title {
  color: var(--ink-900);
}

.page-about .page-about-version-panel--cream p {
  color: var(--ink-800);
}

/* 折叠要点 */
.page-about .page-about-details {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .page-about-details--ink {
  border-top-color: rgba(11, 22, 38, .18);
}

.page-about .page-about-details summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
  transition: color .2s var(--ease);
}

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

.page-about .page-about-details summary::after {
  content: " +";
  color: var(--cyan);
}

.page-about .page-about-details[open] summary::after {
  content: " –";
}

.page-about .page-about-details summary:hover,
.page-about .page-about-details summary:focus-visible {
  color: var(--cyan);
}

.page-about .page-about-details--ink summary {
  color: var(--ink-800);
}

.page-about .page-about-details--ink summary:hover,
.page-about .page-about-details--ink summary:focus-visible {
  color: var(--clay);
}

.page-about .page-about-detail-list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .page-about-detail-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

.page-about .page-about-version-panel--cream .page-about-detail-list li {
  color: var(--ink-800);
}

.page-about .page-about-detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--clay);
}

.page-about .page-about-backtop {
  margin: 30px 0 0;
}

/* ---------- 03 团队 ---------- */
.page-about .page-about-team {
  display: grid;
  gap: 28px;
}

.page-about .page-about-team-copy .index-num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

.page-about .page-about-team-copy h2 {
  margin: 0 0 16px;
  font-size: clamp(23px, 4.8vw, 34px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--warm);
}

.page-about .page-about-team-copy p {
  margin: 0 0 14px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about .page-about-team-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  font-size: 14px;
  color: var(--slate);
}

.page-about .page-about-team-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .page-about-team-facts .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}

.page-about .page-about-team-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
  box-shadow: var(--shadow-panel);
}

.page-about .page-about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: .8;
}

/* ---------- 04 数据合作 ---------- */
.page-about .page-about-axis-media {
  margin: 0 0 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .page-about-axis-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  opacity: .7;
}

.page-about .page-about-axis-media .media-caption {
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--rock);
  border-top: 1px solid var(--line);
}

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

.page-about .page-about-data-card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .page-about-data-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .page-about-data-card:nth-child(3) {
  border-top-color: var(--moss);
}

.page-about .page-about-data-card:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 243, 224, .4);
}

.page-about .page-about-data-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--warm);
}

.page-about .page-about-data-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 05 节奏与响应 ---------- */
.page-about .page-about-rhythm {
  display: grid;
  gap: 14px;
}

.page-about .page-about-rhythm-item {
  padding: 22px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .page-about-rhythm-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .page-about-rhythm-item:nth-child(2) .page-about-rhythm-value {
  color: var(--orange);
}

.page-about .page-about-rhythm-item:nth-child(3) .page-about-rhythm-value {
  color: var(--warm);
}

.page-about .page-about-rhythm-item:nth-child(4) .page-about-rhythm-value {
  color: var(--slate);
}

.page-about .page-about-rhythm-label {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .page-about-rhythm-note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

.page-about .page-about-contact-strip {
  display: grid;
  gap: 16px;
  margin-top: 24px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .page-about-contact-strip p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

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

/* ---------- 06 规模 ---------- */
.page-about .page-about-scale {
  display: grid;
  gap: 18px;
}

.page-about .page-about-scale-item {
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .page-about-scale-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 42px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .page-about-scale-item:nth-child(2) .page-about-scale-num {
  color: var(--warm);
}

.page-about .page-about-scale-item:nth-child(3) .page-about-scale-num {
  color: var(--orange);
  font-size: clamp(22px, 5.4vw, 32px);
}

.page-about .page-about-scale-item .stat-label {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .page-about-scale-note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 收尾 ---------- */
.page-about .page-about-outro {
  margin-top: 28px;
  padding: 28px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--ink-700) 100%);
}

.page-about .page-about-outro h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--warm);
}

.page-about .page-about-outro p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .page-about-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .page-about-outro-note {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--rock);
}

/* ===================== 响应式 ===================== */
@media (min-width: 720px) {
  .page-about .page-about-position-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .page-about-data-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .page-about-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .page-about-contact-strip {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }

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

  .page-about .page-about-version {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .page-about-marker {
    width: 64px;
    height: 64px;
    font-size: 14px;
  }

  .page-about .page-about-versions::before {
    left: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .page-about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .page-about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .page-about-team-copy {
    order: 1;
  }

  .page-about .page-about-team-media {
    order: 2;
  }

  .page-about .page-about-rhythm {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .page-about-hero {
    padding-top: 48px;
  }

  .page-about .page-about-version {
    padding-bottom: 6px;
  }

  .page-about .page-about-version:nth-child(3) {
    margin-left: 3%;
  }

  .page-about .page-about-version:nth-child(4) {
    margin-left: 6%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .page-about-lane,
  .page-about .page-about-data-card,
  .page-about .page-about-version-panel,
  .page-about .page-about-marker,
  .page-about .page-about-details summary,
  .page-about .page-about-crumb .breadcrumbs a {
    transition: none;
  }

  .page-about .page-about-lane:hover,
  .page-about .page-about-data-card:hover,
  .page-about .page-about-version:hover .page-about-version-panel,
  .page-about .page-about-version:focus-within .page-about-version-panel {
    transform: none;
  }
}