.page-about {
  background: var(--c-bg);
  color: var(--c-white);
  overflow-x: hidden;
}

/* ========== Hero 首屏 ========== */
.page-about__hero {
  position: relative;
  background: var(--c-primary);
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  z-index: 0;
  width: 46%;
  height: 100%;
  background: var(--c-primary-light);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: 6%;
  bottom: 8%;
  z-index: 0;
  width: 220px;
  height: 220px;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 22%, 84% 100%, 16% 78%);
  opacity: .32;
  pointer-events: none;
}

.page-about__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 40px;
}

@media (min-width: 960px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 64px;
    padding-top: 64px;
    padding-bottom: 56px;
  }
}

.page-about__hero-copy {
  position: relative;
  z-index: 1;
}

.page-about__hero-copy .breadcrumb {
  margin-bottom: 24px;
}

.page-about__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-accent-gold);
}

.page-about__hero h1 {
  margin: 0 0 20px;
  max-width: 10em;
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--c-white);
}

.page-about__lead {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about__lead strong {
  color: var(--c-white);
  font-weight: 600;
}

.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about__hero-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border: 4px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: rotate(1.5deg);
}

.page-about__hero-figure img,
.page-about__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ========== Hero 数据统计条 ========== */
.page-about__hero-band {
  position: relative;
  z-index: 1;
  background: var(--c-primary-light);
  border-top: 2px solid var(--c-accent-gold);
  padding: 24px 0;
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about__stats {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
  }
}

.page-about__stat {
  background: rgba(255, 255, 255, .04);
  border-radius: var(--radius-md);
  padding: 16px 12px;
  text-align: center;
  cursor: help;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.page-about__stat:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, .07);
  box-shadow: var(--shadow-md);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 36px;
  line-height: 1;
  color: var(--c-accent);
  letter-spacing: .01em;
}

.page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--c-muted);
}

/* ========== 杂志式双栏布局 ========== */
.page-about__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 48px;
  padding-bottom: 80px;
}

@media (min-width: 960px) {
  .page-about__layout {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

/* ========== 左侧章节索引 ========== */
.page-about__aside {
  background: var(--c-surface-1);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: var(--radius-lg);
  padding: 24px;
}

@media (min-width: 960px) {
  .page-about__aside {
    position: sticky;
    top: 132px;
  }
}

.page-about__aside-block + .page-about__aside-block {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed rgba(255, 255, 255, .1);
}

.page-about__aside-label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-accent-gold);
}

.page-about__aside-nav ol,
.page-about__aside-links ul {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about__aside-nav a,
.page-about__aside-links a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--c-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.page-about__aside-nav a:hover,
.page-about__aside-links a:hover {
  background: var(--c-surface);
  color: var(--c-white);
}

.page-about__aside-index {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--c-accent);
}

.page-about__aside-note {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 24px;
  padding: 14px 16px;
  background: var(--c-primary-light);
  border-radius: var(--radius-md);
}

.page-about__aside-note strong {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--c-accent-gold);
}

.page-about__aside-note span {
  font-size: 12px;
  color: var(--c-muted);
}

/* ========== 右侧内容章节 ========== */
.page-about__section {
  scroll-margin-top: 140px;
  margin-bottom: 64px;
}

.page-about__section--banded {
  background: rgba(255, 255, 255, .025);
  border: 1px solid rgba(255, 255, 255, .05);
  border-radius: var(--radius-lg);
  padding: 20px 18px;
}

@media (min-width: 720px) {
  .page-about__section--banded {
    padding: 28px 32px;
  }
}

.page-about__section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about__section-index {
  display: inline-grid;
  place-items: center;
  min-width: 42px;
  height: 28px;
  padding: 0 12px;
  background: var(--c-surface);
  border-radius: var(--radius-pill);
  color: var(--c-accent);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .06em;
}

.page-about__section h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1.2;
  color: var(--c-white);
}

.page-about__content > .page-about__section > p,
.page-about__content p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .84);
}

.page-about__content p strong {
  color: var(--c-white);
  font-weight: 600;
}

/* ========== 品牌定位卡片 ========== */
.page-about__position-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 24px 0 20px;
}

@media (min-width: 720px) {
  .page-about__position-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about__position-item {
  background: var(--c-surface-1);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about__position-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about__position-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 16px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about__position-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .78);
}

/* ========== 媒体图 ========== */
.page-about__media {
  margin: 28px 0;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

/* ========== 数据体系数字块 ========== */
.page-about__data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0;
}

@media (min-width: 720px) {
  .page-about__data-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about__data-box {
  background: var(--c-primary-light);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.page-about__data-box span {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--c-muted);
}

.page-about__data-box strong {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .03em;
  color: var(--c-white);
}

/* ========== 客户端演变 ========== */
.page-about__evolution {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 24px 0 8px;
}

@media (min-width: 720px) {
  .page-about__evolution {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }
}

.page-about__evolution-item {
  background: var(--c-surface-1);
  border-top: 3px solid var(--c-accent-gold);
  border-radius: var(--radius-md);
  padding: 16px;
}

.page-about__evolution-version {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: var(--c-primary-light);
  border-radius: var(--radius-pill);
  color: var(--c-accent-gold);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about__evolution-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .78);
}

/* ========== 发展里程碑时间轴 ========== */
.page-about__timeline {
  list-style: none;
  position: relative;
  margin: 28px 0 0;
  padding: 0;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 12px;
  bottom: 12px;
  border-left: 2px dashed var(--c-accent-gold);
  opacity: .4;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 16px;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .22);
}

.page-about__timeline-summary {
  list-style: none;
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 14px 16px;
  background: var(--c-surface-1);
  border-radius: var(--radius-md);
  border-bottom-left-radius: 0;
  cursor: pointer;
  transition: background var(--transition);
}

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

.page-about__timeline-summary:hover {
  background: var(--c-surface);
}

.page-about__timeline-season {
  padding: 4px 10px;
  background: var(--c-primary-light);
  border-radius: var(--radius-pill);
  color: var(--c-accent);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .06em;
}

.page-about__timeline-title {
  margin-right: auto;
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--c-white);
}

.page-about__timeline-summary::after {
  content: "+";
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1;
  color: var(--c-accent-gold);
  transition: transform var(--transition);
}

.page-about__timeline-item[open] .page-about__timeline-summary::after {
  transform: rotate(45deg);
}

.page-about__timeline-card {
  margin-top: 4px;
  padding: 16px 18px;
  background: var(--c-surface);
  border-left: 4px solid var(--c-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .8);
}

/* ========== 团队与生态 ========== */
.page-about__team-card {
  margin: 24px 0;
  padding: 20px;
  background: var(--c-surface-1);
  border-radius: var(--radius-lg);
}

.page-about__team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about__team-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about__team-stat {
  padding: 12px;
  background: rgba(255, 255, 255, .04);
  border-radius: var(--radius-md);
}

.page-about__team-stat strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1.1;
  color: var(--c-accent);
}

.page-about__team-stat span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-muted);
}

.page-about__contact-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 20px 0 28px;
  padding: 16px;
  background: var(--c-primary-light);
  border-radius: var(--radius-md);
}

@media (min-width: 720px) {
  .page-about__contact-strip {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about__contact-item {
  padding: 12px;
  background: rgba(255, 255, 255, .04);
  border-radius: var(--radius-sm);
}

.page-about__contact-item span {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-about__contact-item strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-white);
  word-break: break-all;
}

/* ========== 底部导航 ========== */
.page-about__next {
  margin-top: 56px;
  padding: 24px;
  background: var(--c-primary-light);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: var(--radius-lg);
}

.page-about__next h2 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--c-white);
}

.page-about__next > p {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--c-muted);
}

.page-about__next-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ========== 动效偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  .page-about__hero-figure {
    transform: none;
  }

  .page-about__stat,
  .page-about__position-item {
    transition: none;
  }
}