.page-about {
  --font-mono: "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, "Liberation Mono", monospace;
  --version-w: 48px;
  --rail-w: 16px;
  --grid-alpha: rgba(212, 168, 67, 0.07);
}

.page-about section[id],
.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .reveal--d1 {
  transition-delay: 0.12s;
}

.page-about .reveal--d2 {
  transition-delay: 0.24s;
}

.page-about .reveal--d3 {
  transition-delay: 0.36s;
}

/* ============ Hero ============ */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + var(--space-4)) 0 var(--space-4);
  border-bottom: 1px solid var(--c-line);
  background:
    linear-gradient(var(--grid-alpha) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-alpha) 1px, transparent 1px),
    radial-gradient(ellipse at 82% 18%, rgba(212, 168, 67, 0.14), transparent 55%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-secondary) 100%);
  background-size:
    36px 36px,
    36px 36px,
    100% 100%,
    100% 100%;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "BRAND / STORY / V3.1";
  position: absolute;
  right: 18px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(212, 168, 67, 0.4);
  pointer-events: none;
}

.page-about .about-hero__inner {
  max-width: 880px;
}

.page-about .about-hero__kicker {
  margin: 24px 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: 38px;
  line-height: 1.14;
  color: var(--c-text);
}

.page-about .about-hero__lead {
  max-width: 660px;
  margin: 0;
  font-size: 17px;
  font-weight: 300;
  line-height: 1.85;
  color: var(--c-text-dim);
}

.page-about .about-chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-chapters__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  font-size: 14px;
  color: var(--c-text-dim);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-chapters__link:hover {
  border-color: var(--c-line);
  background: rgba(212, 168, 67, 0.06);
  color: var(--c-gold-light);
}

.page-about .about-chapters__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gold);
}

.page-about .breadcrumb__item--current {
  color: var(--c-gold);
}

/* ============ 品牌初心 ============ */
.page-about .about-purpose {
  background: linear-gradient(180deg, var(--c-secondary) 0%, var(--c-primary) 100%);
}

.page-about .about-purpose__layout {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-purpose__main p {
  color: var(--c-text-dim);
  line-height: 1.9;
}

.page-about .about-purpose__main p + p {
  margin-top: 16px;
}

.page-about .about-purpose__mission {
  position: relative;
  padding: 28px 24px 26px;
  background: var(--c-secondary);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-gold);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .about-purpose__mission::after {
  content: "MISSION";
  position: absolute;
  right: -6px;
  bottom: -12px;
  font-family: var(--font-heading);
  font-size: 54px;
  line-height: 1;
  color: rgba(212, 168, 67, 0.08);
  pointer-events: none;
}

.page-about .about-purpose__mission-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .about-purpose__mission-text {
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1.45;
  color: var(--c-text);
}

.page-about .about-purpose__mission-list {
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--c-line);
  list-style: none;
}

.page-about .about-purpose__mission-list li {
  position: relative;
  padding-left: 22px;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--c-text-dim);
}

.page-about .about-purpose__mission-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--c-emerald);
  transform: rotate(45deg);
}

/* ============ 发展里程碑 ============ */
.page-about .about-milestones {
  background:
    linear-gradient(rgba(212, 168, 67, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 168, 67, 0.04) 1px, transparent 1px),
    var(--c-primary);
  background-size:
    32px 32px,
    32px 32px,
    100% 100%;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-milestones__desc {
  max-width: 640px;
  margin: 10px 0 0;
  color: var(--c-text-dim);
  line-height: 1.8;
  font-size: 16px;
}

.page-about .about-milestones__visual {
  margin: 32px 0 48px;
}

.page-about .about-milestones__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
}

.page-about .about-milestones__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-dim);
}

.page-about .about-timeline__coords {
  position: relative;
  z-index: 2;
  margin: 0 0 8px;
  padding: 6px 0 6px 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(212, 168, 67, 0.5);
  background: var(--c-primary);
  text-transform: uppercase;
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 860px;
  margin: 0 0 8px;
}

.page-about .about-timeline__rail {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail-w);
  height: 100%;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: calc(var(--version-w) + 14px);
}

.page-about .about-timeline__version {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: var(--version-w);
  padding: 4px 2px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-gold);
  background: var(--c-primary);
  border: 1px solid var(--c-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 36px;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-gold);
  border: 3px solid var(--c-primary);
  box-shadow: 0 0 0 2px rgba(212, 168, 67, 0.3);
}

/* ============ 终端卡片 ============ */
.page-about .about-terminal {
  background: var(--c-secondary);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-terminal:hover {
  transform: translateX(6px);
  border-color: rgba(212, 168, 67, 0.7);
}

.page-about .about-terminal__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  background: rgba(212, 168, 67, 0.08);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-terminal__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-emerald);
}

.page-about .about-terminal__dot--gold {
  background: rgba(212, 168, 67, 0.55);
}

.page-about .about-terminal__filename {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-terminal__body {
  padding: 16px 16px 18px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-terminal__cmd {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--c-gold);
  overflow-wrap: break-word;
}

.page-about .about-terminal__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-terminal__list li {
  position: relative;
  padding-left: 18px;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-text-dim);
}

.page-about .about-terminal__list li::before {
  content: "+";
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--c-emerald);
}

/* ============ 技术架构与数据能力 ============ */
.page-about .about-tech {
  background: var(--c-secondary);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

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

.page-about .about-tech__copy > p {
  color: var(--c-text-dim);
  line-height: 1.8;
}

.page-about .about-tech__copy > p + p {
  margin-top: 16px;
}

.page-about .about-tech__radar-wrap {
  display: flex;
  justify-content: center;
  padding: 24px;
  background: rgba(10, 17, 40, 0.5);
  border: 1px solid var(--c-line);
}

.page-about .about-tech__radar {
  width: 100%;
  max-width: 320px;
  height: auto;
}

.page-about .about-tech__ring {
  fill: none;
  stroke: rgba(212, 168, 67, 0.18);
  stroke-width: 1;
}

.page-about .about-tech__axis {
  stroke: rgba(212, 168, 67, 0.22);
  stroke-width: 1;
}

.page-about .about-tech__data {
  fill: rgba(0, 196, 140, 0.18);
  stroke: var(--c-emerald);
  stroke-width: 2;
  stroke-linejoin: round;
}

.page-about .about-tech__node {
  fill: var(--c-emerald);
}

.page-about .about-tech__radar-label {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--c-text-dim);
}

.page-about .about-tech__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 40px;
}

.page-about .about-tech__stat {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--c-primary);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-tech__stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--c-gold);
}

.page-about .about-tech__stat::after {
  content: "▲";
  position: absolute;
  right: 8px;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(212, 168, 67, 0.35);
}

.page-about .about-tech__num {
  display: block;
  font-family: var(--font-heading);
  font-size: 30px;
  line-height: 1.1;
  color: var(--c-text);
}

.page-about .about-tech__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
}

.page-about .about-tech__visual {
  margin-top: 40px;
}

.page-about .about-tech__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--c-line);
}

.page-about .about-tech__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ============ 团队成员 ============ */
.page-about .about-team__desc,
.page-about .about-service__desc {
  max-width: 640px;
  margin: 10px 0 0;
  color: var(--c-text-dim);
  line-height: 1.8;
  font-size: 16px;
}

.page-about .about-team__roster {
  display: grid;
  gap: 14px;
  margin-top: 36px;
}

.page-about .about-team__role {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--c-secondary);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-team__role:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 168, 67, 0.7);
}

.page-about .about-team__role-num {
  position: absolute;
  right: 12px;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: rgba(212, 168, 67, 0.16);
}

.page-about .about-team__role-title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--c-text);
}

.page-about .about-team__role-desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

.page-about .about-team__role .tag {
  margin: 0;
}

.page-about .about-team__visual {
  margin-top: 36px;
}

.page-about .about-team__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
}

.page-about .about-team__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ============ 用户服务理念 ============ */
.page-about .about-service {
  background: linear-gradient(180deg, var(--c-primary) 0%, var(--c-secondary) 100%);
  border-top: 1px solid var(--c-line);
}

.page-about .about-service__grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-service__pillar {
  position: relative;
  padding: 24px 20px 20px 64px;
  background: rgba(13, 27, 62, 0.7);
  border: 1px solid var(--c-line);
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-service__pillar:hover {
  border-color: rgba(212, 168, 67, 0.7);
  background: rgba(13, 27, 62, 1);
}

.page-about .about-service__pillar-num {
  position: absolute;
  left: 20px;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-gold);
}

.page-about .about-service__pillar-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--c-text);
}

.page-about .about-service__pillar-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

.page-about .about-service__path {
  margin-top: 40px;
  padding: 24px 20px;
  background: rgba(10, 17, 40, 0.5);
  border: 1px dashed var(--c-line);
}

.page-about .about-service__path-label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .about-service__path-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .about-service__path-step {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text);
  background: var(--c-secondary);
  border: 1px solid var(--c-line);
}

.page-about .about-service__path-arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-gold);
}

.page-about .about-service__contact {
  display: grid;
  gap: 12px;
  margin-top: 32px;
  padding: 20px;
  background: rgba(10, 17, 40, 0.6);
  border-left: 4px solid var(--c-emerald);
}

.page-about .about-service__contact-item {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-text-dim);
}

.page-about .about-service__contact-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .about-service__contact-value {
  color: var(--c-text);
  overflow-wrap: break-word;
}

/* ============ 结尾 CTA ============ */
.page-about .about-next {
  background:
    linear-gradient(var(--grid-alpha) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-alpha) 1px, transparent 1px),
    var(--c-primary);
  background-size:
    32px 32px,
    32px 32px,
    100% 100%;
  border-top: 1px solid var(--c-line);
}

.page-about .about-next__inner {
  padding: 16px 0;
  text-align: center;
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 30px;
  color: var(--c-text);
}

.page-about .about-next__text {
  margin: 0 0 24px;
  font-size: 16px;
  color: var(--c-text-dim);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.page-about .about-next__ghost {
  background: transparent;
  border: 1px solid var(--c-line);
  color: var(--c-text-dim);
}

.page-about .about-next__ghost:hover {
  color: var(--c-gold-light);
  border-color: var(--c-gold);
  background: transparent;
}

/* ============ 平板与桌面 ============ */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + var(--space-5)) 0 var(--space-5);
  }

  .page-about .about-hero__title {
    font-size: 60px;
  }

  .page-about .about-tech__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .page-about .about-tech__num {
    font-size: 40px;
  }

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

  .page-about .about-service__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

  .page-about .about-next__title {
    font-size: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-purpose__layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 56px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team__roster {
    grid-template-columns: repeat(4, 1fr);
  }
}