/* ===== 品牌概况页专属样式 ===== */
.page-about {
  background: var(--c-paper);
  overflow-x: hidden;
}

/* 首屏 */
.page-about__hero {
  position: relative;
  background: var(--c-night);
  color: var(--c-paper);
  padding: 112px 0 48px;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -16%;
  width: 52%;
  height: 120%;
  background: var(--c-primary);
  transform: skewX(-14deg);
  z-index: 0;
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-yellow) 70%, transparent 130%);
  z-index: 1;
  pointer-events: none;
}

.page-about__hero .page-about__container {
  position: relative;
  z-index: 2;
}

.page-about__hero .breadcrumbs {
  margin-bottom: 30px;
  color: rgba(245, 245, 245, 0.6);
  font-size: 13px;
}

.page-about__hero .breadcrumbs a {
  color: var(--c-yellow);
  text-decoration: none;
}

.page-about__hero .breadcrumbs a:hover,
.page-about__hero .breadcrumbs a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.page-about__hero .breadcrumbs [aria-current="page"] {
  color: rgba(245, 245, 245, 0.85);
}

.page-about__eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 14px;
  display: inline-block;
  border: 1px solid rgba(255, 77, 0, 0.4);
  background: rgba(255, 77, 0, 0.1);
  padding: 4px 12px;
  border-radius: 99px;
}

.page-about__title {
  font-family: var(--font-title);
  font-size: clamp(28px, 6vw, 52px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--c-paper);
  margin: 0 0 20px;
  max-width: 14em;
}

.page-about__lead {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 245, 245, 0.82);
  max-width: 34em;
  margin: 0 0 28px;
}

.page-about__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 36px;
}

.page-about__index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(245, 245, 245, 0.85);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__index a:hover,
.page-about__index a:focus-visible {
  color: var(--c-yellow);
  border-bottom-color: var(--c-yellow);
  outline: none;
}

.page-about__index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-primary);
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  max-width: 560px;
}

.page-about__stat {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 6px;
  padding: 16px 18px;
  backdrop-filter: blur(4px);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about__stat:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.26);
}

.page-about__stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-primary);
}

.page-about__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(245, 245, 245, 0.7);
}

/* 通用章节 */
.page-about__section {
  position: relative;
  padding: 72px 0;
}

.page-about__container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about__container--wide {
  max-width: 1200px;
}

.page-about__container--narrow {
  max-width: 940px;
}

.page-about__section-index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 20px;
}

.page-about__section-index--light {
  color: var(--c-yellow);
}

.page-about__heading {
  font-family: var(--font-title);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 20px;
}

.page-about__heading--light {
  color: var(--c-paper);
}

.page-about__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink);
  margin-bottom: 16px;
  max-width: 56em;
}

.page-about__body--light {
  color: rgba(245, 245, 245, 0.82);
}

/* 01 品牌起点 */
.page-about__origin {
  background: var(--c-paper);
}

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

.page-about__milestones {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about__milestone {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
  align-items: flex-start;
  transition: padding-left 0.2s ease, background 0.2s ease;
}

.page-about__milestone:hover {
  padding-left: 10px;
  background: linear-gradient(90deg, rgba(255, 77, 0, 0.06), transparent);
}

.page-about__milestone-year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-primary);
  min-width: 56px;
  padding-top: 2px;
}

.page-about__milestone-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about__milestone-info strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about__milestone-info small {
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
}

/* 图片框架 */
.page-about__figure {
  margin: 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--c-line);
}

.page-about__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: #ddd;
}

.page-about__figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
  background: var(--c-paper);
  border-top: 1px solid var(--c-line);
}

/* 02 数据体系 */
.page-about__data {
  background: var(--c-night);
  color: var(--c-paper);
}

.page-about__data::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-yellow));
}

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

.page-about__data-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about__data-list li {
  position: relative;
  padding: 12px 0 12px 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(245, 245, 245, 0.9);
}

.page-about__data-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 10px;
  background: var(--c-primary);
  transform: rotate(45deg);
}

.page-about__figure--square {
  max-width: 600px;
}

.page-about__figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about__fig--light {
  background: #0d1f30;
  color: rgba(245, 245, 245, 0.7);
  border-top-color: rgba(255, 255, 255, 0.12);
}

/* 03 版本演进 */
.page-about__version {
  background: var(--c-paper);
}

.page-about__tree {
  position: relative;
  margin-top: 44px;
  padding-left: 36px;
}

.page-about__tree::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-primary), var(--c-night));
}

.page-about__tree-node {
  position: relative;
  margin-bottom: 28px;
}

.page-about__tree-node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-primary);
  border: 3px solid var(--c-paper);
  box-shadow: 0 0 0 2px var(--c-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about__tree-node:hover::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 5px rgba(255, 77, 0, 0.2);
}

.page-about__tree-version {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-primary);
  background: rgba(255, 77, 0, 0.1);
  border: 1px solid rgba(255, 77, 0, 0.32);
  padding: 3px 14px;
  border-radius: 99px;
  margin-bottom: 10px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about__tree-node:hover .page-about__tree-version,
.page-about__tree-node:focus-within .page-about__tree-version {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
}

.page-about__tree-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  padding: 20px 22px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.page-about__tree-node:hover .page-about__tree-card,
.page-about__tree-node:focus-within .page-about__tree-card {
  box-shadow: 0 10px 32px rgba(10, 27, 42, 0.14);
  transform: translateY(-3px);
  border-color: rgba(255, 77, 0, 0.4);
}

.page-about__tree-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 8px;
}

.page-about__tree-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-gray);
  margin: 0;
}

.page-about__figure--team {
  margin-top: 44px;
  max-width: 620px;
}

/* 04 信任资质 */
.page-about__trust {
  background: var(--c-night);
  color: var(--c-paper);
}

.page-about__trust::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--c-primary);
}

.page-about__trust-grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-about__trust-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 28px;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about__trust-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.24);
}

.page-about__trust-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-yellow);
  border: 1px solid rgba(255, 179, 0, 0.4);
  background: rgba(255, 179, 0, 0.08);
  padding: 3px 12px;
  border-radius: 99px;
  margin-bottom: 16px;
}

.page-about__trust-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-paper);
  margin: 0 0 10px;
}

.page-about__trust-card p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 245, 245, 0.72);
  margin: 0;
}

.page-about__guarantee {
  margin-top: 36px;
  border-left: 3px solid var(--c-primary);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 0 8px 8px 0;
  padding: 18px 24px;
}

.page-about__guarantee p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 245, 245, 0.85);
}

/* CTA 区域 */
.page-about__cta {
  position: relative;
  background: var(--c-primary);
  color: var(--c-ink);
  padding: 72px 0;
  overflow: hidden;
}

.page-about__cta::before {
  content: "";
  position: absolute;
  right: -90px;
  top: -90px;
  width: 280px;
  height: 280px;
  border: 3px solid rgba(17, 17, 17, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__cta::after {
  content: "";
  position: absolute;
  right: -20px;
  bottom: -90px;
  width: 180px;
  height: 180px;
  border: 3px solid rgba(17, 17, 17, 0.18);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__cta .page-about__container {
  position: relative;
  z-index: 1;
}

.page-about__cta-title {
  font-family: var(--font-title);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  margin: 0 0 16px;
  max-width: 12em;
}

.page-about__cta-lead {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(17, 17, 17, 0.8);
  margin: 0 0 28px;
  max-width: 34em;
}

.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about__cta .btn--primary {
  background: var(--c-night);
  color: var(--c-paper);
  border-color: var(--c-night);
}

.page-about__cta .btn--primary:hover,
.page-about__cta .btn--primary:focus-visible {
  background: #0e2436;
  border-color: #0e2436;
}

.page-about__cta .btn--outline {
  border-color: var(--c-ink);
  color: var(--c-ink);
  background: transparent;
}

.page-about__cta .btn--outline:hover,
.page-about__cta .btn--outline:focus-visible {
  background: var(--c-ink);
  color: var(--c-paper);
}

.page-about__cta .btn--ghost {
  border-color: rgba(17, 17, 17, 0.55);
  color: var(--c-ink);
  background: transparent;
}

.page-about__cta .btn--ghost:hover,
.page-about__cta .btn--ghost:focus-visible {
  border-color: var(--c-ink);
  background: rgba(17, 17, 17, 0.08);
}

.page-about__favorite {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px dashed rgba(17, 17, 17, 0.6);
  color: var(--c-ink);
  padding: 10px 20px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
  margin-top: 6px;
}

.page-about__favorite:hover,
.page-about__favorite:focus-visible {
  background: rgba(17, 17, 17, 0.08);
  border-color: var(--c-ink);
  outline: none;
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 140px 0 72px;
  }

  .page-about__title {
    font-size: clamp(38px, 5vw, 54px);
  }

  .page-about__lead {
    font-size: 16px;
  }

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: none;
  }

  .page-about__section {
    padding: 100px 0;
  }

  .page-about__origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

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

  .page-about__trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about__cta {
    padding: 96px 0;
  }

  .page-about__cta-title {
    font-size: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about__tree {
    padding-left: 0;
  }

  .page-about__tree::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__tree-node {
    width: calc(50% - 56px);
    margin-left: 0;
    margin-right: auto;
  }

  .page-about__tree-node:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about__tree-node::before {
    left: auto;
    right: -63px;
  }

  .page-about__tree-node:nth-child(even)::before {
    right: auto;
    left: -63px;
  }

  .page-about__figure--team {
    margin-top: 56px;
    max-width: 680px;
  }
}

/* 减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about__tree-card,
  .page-about__tree-version,
  .page-about__milestone,
  .page-about__trust-card,
  .page-about__stat,
  .page-about__favorite {
    transition: none;
    transform: none;
  }

  .page-about__tree-node:hover .page-about__tree-card {
    transform: none;
  }
}