.page-about {
  --ticket-hole: var(--c-deep);
  --ring-track: rgba(255, 255, 255, 0.08);
  --page-muted: rgba(245, 247, 250, 0.7);
  --page-muted-weak: rgba(245, 247, 250, 0.58);
  background: var(--c-deep);
  color: var(--c-cream);
  overflow-x: hidden;
}

/* ===== 首屏 ===== */
.page-about__hero {
  padding: calc(var(--header-h) + 40px) 0 48px;
  background:
    radial-gradient(900px 420px at 88% 8%, rgba(198, 255, 0, 0.09), transparent 62%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-deep) 100%);
  border-bottom: 1px solid var(--c-rock);
}

.page-about__hero-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about__hero-copy .breadcrumb {
  margin-bottom: 22px;
}

.page-about__eyebrow {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 0 0 16px;
}

.page-about__hero-title {
  font-family: var(--font-head);
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--c-cream);
}

.page-about__hero-title span {
  color: var(--c-orange);
}

.page-about__hero-lead {
  font-size: 19px;
  line-height: 1.5;
  font-weight: 500;
  color: var(--c-cream);
  margin: 0 0 14px;
}

.page-about__hero-note {
  font-size: 15px;
  line-height: 1.7;
  color: var(--page-muted);
  border-left: 2px solid var(--c-accent);
  padding-left: 14px;
  margin: 0;
}

.page-about__hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about__hero-aside {
  display: flex;
  justify-content: center;
}

.page-about__ticket {
  position: relative;
  max-width: 420px;
  width: 100%;
  background: linear-gradient(150deg, rgba(21, 35, 63, 0.92), rgba(13, 21, 38, 0.96));
  border: 1px solid rgba(198, 255, 0, 0.55);
  border-radius: 14px;
  padding: 30px 28px 24px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.35);
}

.page-about__ticket::before,
.page-about__ticket::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--ticket-hole);
  transform: translateY(-50%);
}

.page-about__ticket::before {
  left: -12px;
  box-shadow: inset -2px 0 2px rgba(0, 0, 0, 0.3);
}

.page-about__ticket::after {
  right: -12px;
  box-shadow: inset 2px 0 2px rgba(0, 0, 0, 0.3);
}

.page-about__ticket-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-about__ticket-brand {
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: 0.1em;
  color: var(--c-accent);
}

.page-about__ticket-score {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--c-terra);
  border: 1px solid var(--c-rock);
  padding: 4px 8px;
  border-radius: 4px;
}

.page-about__ticket-num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 26px 0 6px;
}

.page-about__ticket-num-main {
  font-family: var(--font-head);
  font-size: 76px;
  line-height: 1;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about__ticket-num-unit {
  font-family: var(--font-head);
  font-size: 26px;
  color: var(--c-cream);
}

.page-about__ticket-label {
  font-size: 15px;
  color: var(--page-muted);
  margin-bottom: 22px;
}

.page-about__ticket-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--c-rock);
  padding-top: 16px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--c-cream);
}

.page-about__ticket-meta span {
  background: rgba(198, 255, 0, 0.08);
  border: 1px solid rgba(198, 255, 0, 0.2);
  border-radius: 999px;
  padding: 4px 10px;
}

/* ===== 章节标题 ===== */
.page-about__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 44px;
}

.page-about__head-index {
  font-family: var(--font-head);
  font-size: 44px;
  line-height: 1;
  color: var(--c-accent);
  opacity: 0.85;
  min-width: 52px;
}

.page-about__head-text h2 {
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: 0.02em;
  margin: 0;
  color: var(--c-cream);
}

.page-about__head-sub {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--page-muted-weak);
  margin: 8px 0 0;
}

/* ===== 品牌故事时间线 ===== */
.page-about__story {
  padding: 64px 0;
  background:
    linear-gradient(rgba(58, 74, 99, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(58, 74, 99, 0.06) 1px, transparent 1px),
    var(--c-deep);
  background-size: 32px 32px;
}

.page-about__timeline {
  position: relative;
  padding-left: 40px;
}

.page-about__timeline-line {
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-rock) 85%);
}

.page-about__timeline-item {
  position: relative;
  padding-bottom: 36px;
}

.page-about__timeline-dot {
  position: absolute;
  left: -40px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 14px rgba(198, 255, 0, 0.55);
}

.page-about__timeline-card {
  padding: 22px;
  background: rgba(245, 247, 250, 0.04);
  border: 1px solid var(--c-rock);
  border-radius: var(--radius);
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about__timeline-card:hover {
  border-color: var(--c-accent);
  background: rgba(198, 255, 0, 0.05);
  transform: translateY(-2px);
}

.page-about__timeline-year {
  font-family: var(--font-head);
  font-size: 34px;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: 0.02em;
}

.page-about__timeline-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--c-cream);
  margin: 14px 0 8px;
}

.page-about__timeline-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--page-muted);
  margin: 0;
}

/* ===== 团队与规模 ===== */
.page-about__team {
  padding: 64px 0;
  background: var(--c-primary);
}

.page-about__team-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about__team-lead {
  font-size: 18px;
  line-height: 1.6;
  color: var(--c-cream);
  margin: 0 0 12px;
}

.page-about__team-detail {
  font-size: 15px;
  line-height: 1.7;
  color: var(--page-muted);
  margin: 0;
}

.page-about__team-roster {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.page-about__team-role {
  border-left: 3px solid var(--c-accent);
  padding-left: 14px;
}

.page-about__team-role-num {
  display: block;
  font-family: var(--font-head);
  font-size: 38px;
  line-height: 1;
  color: var(--c-orange);
}

.page-about__team-role-label {
  display: block;
  font-size: 13px;
  color: var(--page-muted);
  margin-top: 6px;
}

.page-about__team-figure {
  margin: 0;
}

.page-about__team-figure-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-rock);
  border-radius: 10px;
}

.page-about__team-figure-cap {
  font-size: 13px;
  color: var(--page-muted-weak);
  margin-top: 10px;
  text-align: left;
}

/* ===== 数据服务能力 ===== */
.page-about__capability {
  padding: 64px 0;
  background: var(--c-deep);
}

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

.page-about__cap-card {
  text-align: center;
  padding: 26px 20px;
  background: rgba(245, 247, 250, 0.03);
  border: 1px solid var(--c-rock);
  border-radius: 10px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about__cap-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about__ring {
  --ring: 78%;
  position: relative;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background: conic-gradient(var(--c-accent) var(--ring), var(--ring-track) 0);
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about__ring::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  background: var(--c-deep);
}

.page-about__ring:hover {
  transform: scale(1.06);
  box-shadow: 0 0 26px rgba(198, 255, 0, 0.35);
}

.page-about__ring-center {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-about__ring-value {
  display: block;
  font-family: var(--font-head);
  font-size: 27px;
  line-height: 1;
  color: var(--c-orange);
}

.page-about__ring-label {
  display: block;
  font-size: 12px;
  color: var(--page-muted);
  margin-top: 6px;
}

.page-about__cap-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-cream);
  margin: 0 0 10px;
}

.page-about__cap-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--page-muted);
  margin: 0;
}

.page-about__capability-note {
  max-width: 760px;
  margin: 40px auto 0;
  font-size: 14px;
  line-height: 1.8;
  text-align: center;
  color: var(--page-muted-weak);
  border-top: 1px solid var(--c-rock);
  padding-top: 24px;
}

/* ===== 技术架构演进 ===== */
.page-about__tech {
  padding: 64px 0;
  background: var(--c-primary);
}

.page-about__tech-figure {
  margin: 0 0 40px;
}

.page-about__tech-figure-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-rock);
  border-radius: 10px;
}

.page-about__tech-figure figcaption {
  font-size: 13px;
  color: var(--page-muted-weak);
  margin-top: 10px;
  text-align: center;
}

.page-about__version-grid {
  display: grid;
  gap: 18px;
  align-items: stretch;
}

.page-about__version-card {
  padding: 26px;
  border-radius: 10px;
  position: relative;
}

.page-about__version-card--legacy {
  background: rgba(245, 247, 250, 0.03);
  border: 1px solid var(--c-rock);
}

.page-about__version-card--new {
  background: linear-gradient(160deg, rgba(198, 255, 0, 0.09), rgba(27, 42, 74, 0.6));
  border: 1px solid var(--c-accent);
  box-shadow: 0 0 34px rgba(198, 255, 0, 0.08);
}

.page-about__version-tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 4px;
  background: var(--c-rock);
  color: var(--c-cream);
  margin-bottom: 14px;
}

.page-about__version-card--new .page-about__version-tag {
  background: var(--c-accent);
  color: var(--c-deep);
}

.page-about__version-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--c-cream);
  margin: 0 0 16px;
}

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

.page-about__version-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--page-muted);
}

.page-about__version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-terra);
}

.page-about__version-card--new .page-about__version-list li::before {
  background: var(--c-accent);
}

.page-about__version-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--c-accent);
}

.page-about__version-arrow-line {
  height: 1px;
  width: 40px;
  background: var(--c-accent);
}

.page-about__version-arrow-head {
  font-size: 22px;
  line-height: 1;
}

/* ===== 荣誉与认证 ===== */
.page-about__honors {
  padding: 64px 0;
  background:
    radial-gradient(600px 300px at 80% 0%, rgba(255, 107, 53, 0.08), transparent),
    linear-gradient(rgba(58, 74, 99, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(58, 74, 99, 0.05) 1px, transparent 1px),
    var(--c-deep);
  background-size: auto, 36px 36px, 36px 36px, auto;
}

.page-about__honor-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about__honor-list {
  display: grid;
  gap: 16px;
}

.page-about__honor-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 4px 14px;
  padding: 20px;
  background: rgba(245, 247, 250, 0.04);
  border: 1px solid var(--c-rock);
  border-radius: 8px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__honor-card:hover {
  border-color: var(--c-orange);
  transform: translateX(4px);
}

.page-about__honor-year {
  font-family: var(--font-head);
  font-size: 28px;
  line-height: 1.2;
  color: var(--c-terra);
}

.page-about__honor-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-cream);
  margin: 0;
  align-self: center;
}

.page-about__honor-card p {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--page-muted);
  margin: 6px 0 0;
}

.page-about__honor-figure {
  margin: 0;
}

.page-about__honor-figure-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-rock);
  border-radius: 10px;
}

.page-about__honor-figure figcaption {
  font-size: 13px;
  color: var(--page-muted-weak);
  margin-top: 12px;
  text-align: center;
}

/* ===== 收尾导览 ===== */
.page-about__outro {
  padding: 64px 0;
  background: var(--c-deep);
}

.page-about__outro-inner {
  text-align: center;
  padding: 48px 22px;
  background: linear-gradient(135deg, rgba(27, 42, 74, 0.9), rgba(13, 21, 38, 0.98));
  border: 1px solid var(--c-rock);
  border-top: 2px solid var(--c-accent);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.page-about__outro-title {
  font-family: var(--font-head);
  font-size: clamp(24px, 4vw, 34px);
  color: var(--c-cream);
  margin: 0 0 14px;
}

.page-about__outro-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--page-muted);
  max-width: 640px;
  margin: 0 auto 24px;
}

.page-about__outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.page-about__to-top {
  border-color: var(--c-rock);
  color: var(--c-cream);
  background: transparent;
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about__to-top:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .page-about__hero {
    padding: calc(var(--header-h) + 64px) 0 80px;
  }

  .page-about__hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about__hero-aside {
    justify-content: flex-end;
  }

  .page-about__ticket {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about__story,
  .page-about__team,
  .page-about__capability,
  .page-about__tech,
  .page-about__honors,
  .page-about__outro {
    padding: 88px 0;
  }

  /* 时间线居中交错 */
  .page-about__timeline {
    padding-left: 0;
  }

  .page-about__timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__timeline-item {
    width: 50%;
    margin-right: 50%;
    padding-right: 42px;
    padding-bottom: 28px;
    text-align: right;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-right: 0;
    margin-left: 50%;
    padding-right: 0;
    padding-left: 42px;
    text-align: left;
  }

  .page-about__timeline-dot {
    left: auto;
    right: -7px;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-dot {
    right: auto;
    left: -7px;
  }

  .page-about__team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about__capability-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about__version-grid {
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
  }

  .page-about__version-arrow {
    flex-direction: column;
  }

  .page-about__version-arrow-line {
    width: 1px;
    height: 40px;
  }

  .page-about__honor-grid {
    grid-template-columns: 1fr 380px;
    gap: 48px;
  }
}