/* ===== 关于我们：品牌坐标地图 ===== */

.page-about {
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
}

.page-about__shell {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 28px 20px 72px;
}

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

/* 面包屑 */
.page-about .breadcrumbs {
  margin-bottom: 28px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--color-charcoal);
}

.page-about .breadcrumbs a {
  color: var(--color-charcoal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.page-about .breadcrumbs a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* 首屏标题区 */
.page-about__hero {
  position: relative;
  border-bottom: 2px solid var(--color-ink);
  padding: 24px 0 32px;
  margin-bottom: 48px;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 88px;
  height: 8px;
  background: linear-gradient(90deg, var(--color-primary) 0 62%, var(--color-neon) 62% 100%);
}

.page-about__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-about__hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-title);
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  max-width: 13em;
}

.page-about__lead {
  margin: 0;
  max-width: 44em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-charcoal);
}

/* 页面章节导航 */
.page-about__anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about__anchors a {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-ink);
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.page-about__anchors a span {
  font-weight: 700;
  color: var(--color-primary);
  margin-right: 6px;
}

.page-about__anchors a:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-white);
}

.page-about__anchors a:hover span {
  color: var(--color-white);
}

/* 品牌宣言 */
.page-about__manifesto {
  display: grid;
  gap: 32px;
  align-items: center;
  margin-bottom: 72px;
}

.page-about__kicker {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-about__kicker--light {
  color: var(--color-neon);
}

.page-about__manifesto-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.8vw, 38px);
  line-height: 1.18;
}

.page-about__manifesto-copy p {
  margin: 0 0 14px;
  line-height: 1.8;
  color: var(--color-charcoal);
}

.page-about__manifesto-copy p:last-child {
  margin-bottom: 0;
}

.page-about__manifesto-copy strong {
  color: var(--color-primary);
  font-weight: 700;
}

/* 图片框 */
.page-about__img-frame {
  position: relative;
  background: var(--color-ink);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transform: rotate(-1.2deg);
  box-shadow: 10px 10px 0 var(--color-primary);
}

.page-about__img-frame--silver {
  transform: rotate(1.1deg);
  box-shadow: 10px 10px 0 var(--color-silver);
}

.page-about__img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(57, 255, 20, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.18) 1px, transparent 1px);
  background-size: 26px 26px;
  mix-blend-mode: screen;
  opacity: 0.55;
}

.page-about__img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__manifesto-fig,
.page-about__standards-fig {
  margin: 0;
}

.page-about__manifesto-fig figcaption,
.page-about__standards-fig figcaption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-charcoal);
}

.page-about__manifesto-fig figcaption::before,
.page-about__standards-fig figcaption::before {
  content: "";
  flex: 0 0 auto;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}

/* 发展历程：坐标轴时间线 */
.page-about__timeline {
  background: var(--color-ink);
  background-image:
    linear-gradient(rgba(245, 240, 232, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 232, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  border-radius: var(--radius-lg);
  padding: 44px 20px 48px;
  margin-bottom: 72px;
}

.page-about__timeline-head {
  max-width: 30em;
}

.page-about__timeline-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.8vw, 38px);
  line-height: 1.18;
  color: var(--color-white);
}

.page-about__timeline-head p {
  margin: 0;
  line-height: 1.7;
  color: rgba(245, 240, 232, 0.75);
}

.page-about__timeline-list {
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-neon) 100%);
}

.page-about__tl-item {
  position: relative;
  padding: 0 0 30px 34px;
}

.page-about__tl-item:last-child {
  padding-bottom: 0;
}

.page-about__tl-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-neon);
}

.page-about__tl-card {
  background: rgba(245, 240, 232, 0.06);
  border: 1px solid rgba(245, 240, 232, 0.14);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about__tl-year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-neon);
}

.page-about__tl-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 21px;
  line-height: 1.2;
  color: var(--color-white);
}

.page-about__tl-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 240, 232, 0.82);
}

/* 数据一览 */
.page-about__stats {
  margin-bottom: 72px;
}

.page-about__stats-head {
  margin-bottom: 26px;
}

.page-about__stats-head h2 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.8vw, 38px);
  line-height: 1.18;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.page-about__stat {
  position: relative;
  min-width: 0;
  overflow: hidden;
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 18px 14px 16px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about__stat::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-neon));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-med);
}

.page-about__stat-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.page-about__stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--color-charcoal);
}

/* 社区规模 */
.page-about__community {
  display: grid;
  gap: 22px;
  background: var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.page-about__community-fig {
  margin: 0;
}

.page-about__community-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about__community-copy h3 {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 26px;
  line-height: 1.2;
  color: var(--color-white);
}

.page-about__community-copy p {
  margin: 0 0 18px;
  line-height: 1.75;
  color: rgba(245, 240, 232, 0.85);
}

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

.page-about__community-specs li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-family: var(--font-data);
  font-size: 14px;
  color: rgba(245, 240, 232, 0.85);
}

.page-about__community-specs strong {
  color: var(--color-neon);
  font-weight: 700;
}

/* 我们的标准 */
.page-about__standards {
  display: grid;
  gap: 32px;
  align-items: center;
  margin-bottom: 72px;
}

.page-about__standards-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: clamp(26px, 3.8vw, 38px);
  line-height: 1.18;
}

.page-about__standards-lead {
  margin: 0 0 20px;
  line-height: 1.7;
  color: var(--color-charcoal);
}

.page-about__standards-list {
  counter-reset: std;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__standards-list li {
  position: relative;
  counter-increment: std;
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px 16px 16px 52px;
  margin-bottom: 12px;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about__standards-list li:last-child {
  margin-bottom: 0;
}

.page-about__standards-list li::before {
  content: counter(std, decimal-leading-zero);
  position: absolute;
  left: 14px;
  top: 16px;
  font-family: var(--font-data);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.page-about__standards-list h3 {
  margin: 0 0 4px;
  font-size: 17px;
  line-height: 1.4;
}

.page-about__standards-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-charcoal);
}

/* 底部探索入口 */
.page-about__next {
  text-align: center;
  color: var(--color-paper);
  background:
    radial-gradient(circle at 85% 20%, rgba(228, 0, 43, 0.4), transparent 44%),
    linear-gradient(130deg, var(--color-ink) 0%, var(--color-charcoal) 72%);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
}

.page-about__next h2 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.2;
  color: var(--color-white);
}

.page-about__next p {
  max-width: 40em;
  margin: 0 auto 24px;
  line-height: 1.7;
  color: rgba(245, 240, 232, 0.82);
}

.page-about__next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 22px;
}

.page-about__back-home {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.05em;
  color: rgba(245, 240, 232, 0.75);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.page-about__back-home:hover {
  color: var(--color-neon);
  border-color: var(--color-neon);
}

/* 悬停微交互 */
@media (hover: hover) {
  .page-about__tl-item:hover .page-about__tl-card {
    background: rgba(228, 0, 43, 0.16);
    border-color: rgba(57, 255, 20, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
  }

  .page-about__stat:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(26, 26, 26, 0.12);
  }

  .page-about__stat:hover::after {
    transform: scaleX(1);
  }

  .page-about__standards-list li:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
    box-shadow: -4px 0 0 var(--color-neon);
  }
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about__shell {
    padding: 40px 32px 88px;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about__stat {
    padding: 22px 18px 20px;
  }

  .page-about__community {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 28px;
    padding: 28px;
  }

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

  .page-about__community-specs li {
    display: block;
  }

  .page-about__community-specs strong {
    display: block;
    margin-bottom: 2px;
  }

  .page-about__timeline {
    padding: 56px 32px 60px;
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-about__manifesto {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 56px;
  }

  .page-about__standards {
    grid-template-columns: 1fr 0.9fr;
    gap: 56px;
  }

  .page-about__timeline {
    padding: 56px 48px 60px;
  }

  .page-about__timeline-head {
    max-width: 26em;
  }

  .page-about__timeline-list {
    margin-top: 48px;
  }

  .page-about__timeline-list::before {
    top: 4px;
    bottom: 4px;
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about__tl-item {
    width: 50%;
    padding: 0 60px 44px 0;
    text-align: right;
  }

  .page-about__tl-item:last-child {
    padding-bottom: 4px;
  }

  .page-about__tl-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 44px 60px;
    text-align: left;
  }

  .page-about__tl-dot {
    left: auto;
    right: -8px;
    top: 8px;
  }

  .page-about__tl-item:nth-child(even) .page-about__tl-dot {
    right: auto;
    left: -8px;
    top: 8px;
  }

  .page-about__next {
    padding: 48px 40px;
  }
}