/* ========== 品牌故事页 .page-about ========== */
.page-about {
  background: var(--c-bg-dark);
  color: var(--c-text);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 目录预览 ---------- */
.page-about__preview {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding-top: 24px;
  padding-bottom: 8px;
}

.page-about__preview-tag {
  font-family: var(--font-mono);
  font-size: var(--index);
  letter-spacing: var(--track);
  color: var(--c-secondary);
  text-transform: uppercase;
}

.page-about__preview-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
  text-decoration: none;
  padding: 6px 14px;
  border: 1px solid rgba(160, 180, 196, 0.3);
  border-radius: var(--radius-pill);
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

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

.page-about__preview-link:hover {
  color: var(--c-text);
  border-color: var(--c-primary);
  background: rgba(0, 168, 118, 0.1);
}

/* ---------- 章节头部 ---------- */
.page-about__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about__head-num {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 72px;
  line-height: 1;
  color: var(--c-primary);
  letter-spacing: -0.03em;
}

.page-about__head-kicker {
  font-family: var(--font-mono);
  font-size: var(--index);
  letter-spacing: var(--track);
  color: var(--c-muted);
  text-transform: uppercase;
  padding-left: 16px;
  border-left: 2px solid var(--c-primary);
}

.page-about__h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 48px;
  line-height: 1.2;
  margin: 0 0 20px;
  max-width: 10em;
}

.page-about__h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 36px;
  line-height: 1.25;
  margin: 0 0 16px;
}

.page-about__lead {
  font-size: 20px;
  line-height: 1.6;
  color: var(--c-text);
  margin: 0 0 24px;
  max-width: 30em;
}

.page-about__paragraph {
  font-size: var(--body);
  line-height: var(--lh);
  color: var(--c-muted);
  margin: 0 0 16px;
  max-width: 42em;
}

.page-about__sub {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
  margin: 0 0 40px;
}

/* ---------- 起源章节 ---------- */
.page-about__origin {
  position: relative;
  padding: 64px 0 88px;
}

.page-about__origin::before {
  content: "01";
  position: absolute;
  right: 2%;
  top: 4%;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 220px;
  line-height: 1;
  color: rgba(0, 168, 118, 0.05);
  pointer-events: none;
}

.page-about__origin-grid {
  position: relative;
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about__origin-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about__origin-stat {
  background: var(--c-bg-light);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  border-left: 3px solid var(--c-primary);
  transition: background var(--ease), border-color var(--ease);
}

.page-about__origin-stat:hover {
  background: rgba(0, 168, 118, 0.35);
  border-color: var(--c-secondary);
}

.page-about__origin-stat dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  letter-spacing: 0.08em;
}

.page-about__origin-stat dd {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  margin: 4px 0 0;
  color: var(--c-text);
}

.page-about__origin-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__origin-figure img {
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  transition: transform 0.4s ease;
}

.page-about__origin-figure:hover img {
  transform: scale(1.02);
}

.page-about__origin-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  padding: 12px 16px;
  letter-spacing: 0.04em;
}

/* ---------- 里程碑章节 ---------- */
.page-about__milestone-section {
  background: var(--c-bg-dark);
  padding: 64px 0 88px;
}

.page-about__milestone-layout {
  display: grid;
  gap: 40px;
}

.page-about__milestone-sticky {
  position: relative;
}

.page-about__milestone-sticky::after {
  content: "";
  display: block;
  width: 2px;
  height: 120px;
  margin-top: 24px;
  margin-left: 4px;
  background: linear-gradient(to bottom, var(--c-primary), var(--c-secondary), transparent);
}

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

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-primary) 0%, var(--c-secondary) 55%, transparent 100%);
}

.page-about__timeline-item {
  position: relative;
  margin-bottom: 24px;
}

.page-about__timeline-dot {
  position: absolute;
  left: -31px;
  top: 40px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-secondary);
  border: 3px solid var(--c-bg-dark);
  box-shadow: 0 0 0 2px var(--c-secondary);
  transition: transform var(--ease-med), box-shadow var(--ease-med);
}

.page-about__timeline-item:hover .page-about__timeline-dot,
.page-about__timeline-item:focus-within .page-about__timeline-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 8px rgba(229, 169, 61, 0.15);
}

.page-about__timeline-card {
  background: var(--c-bg-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid transparent;
  transition: transform var(--ease-med), box-shadow var(--ease-med), border-color var(--ease);
}

.page-about__timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--c-border);
}

.page-about__timeline-item:nth-child(even) .page-about__timeline-card {
  background: var(--c-burgundy);
}

.page-about__timeline-item:nth-child(even) .page-about__timeline-dot {
  border-color: var(--c-burgundy);
}

.page-about__timeline-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about__timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  color: var(--c-secondary);
  line-height: 1;
}

.page-about__timeline-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  border: 1px solid rgba(160, 180, 196, 0.4);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
}

.page-about__timeline-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 22px;
  margin: 0 0 8px;
}

.page-about__timeline-text {
  font-size: 14px;
  line-height: var(--lh);
  color: var(--c-text);
  margin: 0 0 12px;
}

.page-about__timeline-detail {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
  border-left: 2px solid var(--c-secondary);
  padding-left: 12px;
  margin: 0;
  max-height: none;
  opacity: 1;
  transform: none;
}

/* ---------- 为什么章节 ---------- */
.page-about__why-section {
  background: var(--c-burgundy);
  padding: 64px 0 88px;
}

.page-about__why-grid {
  display: grid;
  gap: 40px;
  align-items: start;
}

.page-about__why-copy .page-about__head-num {
  color: var(--c-secondary);
}

.page-about__why-copy .page-about__head-kicker {
  border-left-color: var(--c-secondary);
}

.page-about__why-lead {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.4;
  color: var(--c-text);
  margin: 24px 0 16px;
}

.page-about__why-paragraph {
  font-size: var(--body);
  line-height: var(--lh);
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 20px;
  max-width: 40em;
}

.page-about__why-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about__why-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about__why-item:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
}

.page-about__why-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--c-secondary);
  line-height: 1;
  padding-top: 2px;
}

.page-about__why-item strong {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 6px;
}

.page-about__why-item p {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

/* ---------- 团队章节 ---------- */
.page-about__team-section {
  background: var(--c-bg-light);
  padding: 64px 0 88px;
}

.page-about__team-layout {
  display: grid;
  gap: 32px;
}

.page-about__team-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__team-figure img {
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 90% 0, 100% 14%, 100% 86%, 90% 100%, 0 100%);
  transition: transform 0.4s ease;
}

.page-about__team-figure:hover img {
  transform: scale(1.03);
}

.page-about__team-copy {
  min-width: 0;
}

.page-about__team-text {
  font-size: var(--body);
  line-height: var(--lh);
  color: var(--c-muted);
  margin: 0 0 24px;
  max-width: 44em;
}

.page-about__text-link {
  color: var(--c-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 168, 118, 0.4);
  transition: color var(--ease), border-color var(--ease);
}

.page-about__text-link:hover {
  color: var(--c-secondary);
  border-color: var(--c-secondary);
}

.page-about__team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about__team-stat {
  background: var(--c-bg-dark);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  border-top: 3px solid var(--c-primary);
  transition: transform var(--ease), border-color var(--ease);
}

.page-about__team-stat:hover {
  transform: translateY(-2px);
  border-color: var(--c-secondary);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 32px;
  color: var(--c-secondary);
  line-height: 1;
  margin-bottom: 6px;
}

.page-about__stat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  text-transform: uppercase;
}

/* ---------- 云南章节 ---------- */
.page-about__yunnan-section {
  background: var(--c-indigo);
  padding: 64px 0 88px;
}

.page-about__yunnan-section .page-about__head-num {
  color: var(--c-secondary);
}

.page-about__yunnan-section .page-about__head-kicker {
  border-left-color: var(--c-secondary);
}

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

.page-about__yunnan-text {
  font-size: var(--body);
  line-height: var(--lh);
  color: rgba(255, 255, 255, 0.86);
  margin: 0 0 16px;
  max-width: 40em;
}

.page-about__yunnan-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__yunnan-figure img {
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 8% 100%);
  transition: transform 0.4s ease;
}

.page-about__yunnan-figure:hover img {
  transform: scale(1.03);
}

/* ---------- 结尾区域 ---------- */
.page-about__closing {
  background: var(--c-bg-dark);
  padding: 80px 0;
  text-align: center;
}

.page-about__closing-index {
  font-family: var(--font-mono);
  font-size: var(--index);
  letter-spacing: var(--track);
  color: var(--c-secondary);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.page-about__closing-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 36px;
  margin: 0 0 16px;
}

.page-about__closing-sub {
  color: var(--c-muted);
  font-size: 16px;
  line-height: var(--lh);
  max-width: 40em;
  margin: 0 auto 32px;
}

.page-about__closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ---------- 断点：平板 ---------- */
@media (min-width: 768px) {
  .page-about__h1 {
    font-size: 64px;
  }

  .page-about__h2 {
    font-size: 44px;
  }

  .page-about__origin-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .page-about__why-grid {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .page-about__team-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__team-layout {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about__yunnan-grid {
    grid-template-columns: 1fr 0.85fr;
  }

  .page-about__milestone-layout {
    grid-template-columns: 180px 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about__milestone-sticky {
    position: sticky;
    top: 100px;
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 1024px) {
  .page-about__origin,
  .page-about__milestone-section,
  .page-about__why-section,
  .page-about__team-section,
  .page-about__yunnan-section {
    padding-top: 88px;
    padding-bottom: 112px;
  }

  .page-about__closing {
    padding-top: 104px;
    padding-bottom: 104px;
  }

  .page-about__timeline-detail {
    max-height: 0;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--ease-med), transform var(--ease-med), max-height var(--ease-med);
  }

  .page-about__timeline-item:hover .page-about__timeline-detail,
  .page-about__timeline-item:focus-within .page-about__timeline-detail {
    max-height: 220px;
    opacity: 1;
    transform: translateY(0);
    margin-top: 12px;
  }

  .page-about__closing-title {
    font-size: 56px;
  }
}