.page-about {
  --about-gap: 2rem;
  --about-card-radius: 16px;
  --about-image-radius: 24px;
  --about-transition: 0.35s ease;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 1.5rem 1rem 3rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text, #E0E0E0);
  padding: 0.5rem 0;
  flex-wrap: wrap;
}

.page-about .breadcrumb a {
  color: var(--color-link, #9B59B6);
  text-decoration: none;
  transition: color var(--about-transition);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-accent, #D4AF37);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text-white, #FFFFFF);
  font-weight: 600;
}

/* ===== Hero / 品牌故事 ===== */
.page-about__hero {
  width: 100%;
}

.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  align-items: center;
}

.page-about__hero-image {
  flex-shrink: 0;
  width: 100%;
  max-width: 600px;
  border-radius: var(--about-image-radius);
  overflow: hidden;
  border: 2px solid var(--color-border, #D4AF37);
  box-shadow: 0 8px 30px rgba(90, 45, 140, 0.3);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about__hero-image:hover {
  transform: scale(1.01);
  box-shadow: 0 12px 40px rgba(212, 175, 55, 0.25);
}

.page-about__hero-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 600 / 400;
}

.page-about__hero-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about__title {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-white, #FFFFFF);
  margin: 0;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 12px rgba(90, 45, 140, 0.5);
  background: linear-gradient(135deg, #D4AF37, #9B59B6, #D4AF37);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-about__lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-white, #FFFFFF);
  margin: 0;
  font-weight: 400;
}

.page-about__desc {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text, #E0E0E0);
  margin: 0;
}

/* ===== 版本里程碑 ===== */
.page-about__milestones {
  width: 100%;
}

.page-about__milestones-inner {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  align-items: center;
}

.page-about__milestones-text {
  flex: 1;
  order: 1;
}

.page-about__section-title {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-white, #FFFFFF);
  margin: 0 0 1rem;
  position: relative;
  display: inline-block;
}

.page-about__section-title::after {
  content: '';
  display: block;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, #D4AF37, transparent);
  margin-top: 0.5rem;
  border-radius: 2px;
}

.page-about__milestones-intro {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text, #E0E0E0);
  margin: 0 0 1.5rem;
}

.page-about__milestones-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about__milestone-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-bg-overlay, #1A0A2E);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-card, 16px);
  border-left: 4px solid var(--color-accent, #D4AF37);
  transition: background var(--about-transition), transform var(--about-transition);
}

.page-about__milestone-item:hover {
  background: var(--color-bg-card, #5A2D8C);
  transform: translateX(4px);
}

.page-about__version-number {
  font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent, #D4AF37);
  white-space: nowrap;
  flex-shrink: 0;
  padding: 0.125rem 0.5rem;
  background: rgba(212, 175, 55, 0.12);
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--about-transition), color var(--about-transition);
}

.page-about__version-number:hover,
.page-about__version-number:focus-visible {
  background: var(--color-accent, #D4AF37);
  color: var(--color-bg-main, #0B0C10);
  outline: none;
}

.page-about__version-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text, #E0E0E0);
  margin: 0;
}

.page-about__milestones-cta {
  margin-top: 0.5rem;
}

.page-about__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent, #D4AF37);
  color: var(--color-bg-main, #0B0C10);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-capsule, 9999px);
  text-decoration: none;
  transition: background var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
  border: none;
  cursor: pointer;
}

.page-about__btn:hover,
.page-about__btn:focus-visible {
  background: var(--color-accent-dark, #B8860B);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.3);
  outline: none;
}

.page-about__milestones-image {
  order: 2;
  width: 100%;
  max-width: 800px;
  border-radius: var(--about-image-radius);
  overflow: hidden;
  border: 2px solid var(--color-border, #D4AF37);
  box-shadow: 0 6px 24px rgba(90, 45, 140, 0.25);
  transition: transform var(--about-transition);
}

.page-about__milestones-image:hover {
  transform: scale(1.01);
}

.page-about__milestones-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 800 / 200;
}

/* ===== 我们的承诺 ===== */
.page-about__promise {
  width: 100%;
}

.page-about__promise-inner {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  align-items: center;
}

.page-about__promise-image {
  width: 100%;
  max-width: 400px;
  border-radius: var(--about-image-radius);
  overflow: hidden;
  border: 2px solid var(--color-border, #D4AF37);
  box-shadow: 0 6px 24px rgba(90, 45, 140, 0.25);
  transition: transform var(--about-transition);
}

.page-about__promise-image:hover {
  transform: scale(1.01);
}

.page-about__promise-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 400 / 400;
}

.page-about__promise-text {
  flex: 1;
}

.page-about__promise-intro {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text, #E0E0E0);
  margin: 0 0 1.5rem;
}

.page-about__promise-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-about__promise-card {
  background: var(--color-bg-card, #5A2D8C);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-card, 16px);
  border: 1px solid rgba(212, 175, 55, 0.2);
  transition: transform var(--about-transition), border-color var(--about-transition), box-shadow var(--about-transition);
  cursor: default;
}

.page-about__promise-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent, #D4AF37);
  box-shadow: 0 8px 28px rgba(212, 175, 55, 0.15);
}

.page-about__promise-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-white, #FFFFFF);
  margin: 0 0 0.5rem;
}

.page-about__promise-card-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text, #E0E0E0);
  margin: 0;
}

.page-about__promise-cta {
  margin-top: 0.5rem;
}

/* ===== 桌面布局（≥768px） ===== */
@media (min-width: 768px) {
  .page-about {
    gap: 4rem;
    padding: 2rem 2rem 4rem;
  }

  .page-about__hero-inner {
    flex-direction: row;
    align-items: center;
  }

  .page-about__hero-image {
    max-width: 50%;
  }

  .page-about__title {
    font-size: 2.5rem;
  }

  .page-about__milestones-inner {
    flex-direction: row;
    align-items: center;
  }

  .page-about__milestones-text {
    order: 0;
    flex: 1.2;
  }

  .page-about__milestones-image {
    order: 1;
    max-width: 45%;
  }

  .page-about__promise-inner {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about__promise-image {
    max-width: 35%;
    position: sticky;
    top: calc(var(--header-height, 60px) + 2rem);
  }

  .page-about__promise-text {
    flex: 1.2;
  }

  .page-about__promise-cards {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .page-about__promise-card {
    flex: 1 1 200px;
  }
}

/* ===== 大桌面（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-about {
    gap: 5rem;
    padding: 2.5rem 2rem 5rem;
  }

  .page-about__hero-image {
    max-width: 45%;
  }

  .page-about__title {
    font-size: 3rem;
  }

  .page-about__milestones-image {
    max-width: 40%;
  }

  .page-about__promise-image {
    max-width: 30%;
  }
}

/* ===== 交互强化 ===== */
.page-about__version-number[data-interact="goto-updates"]:focus-visible {
  outline: 2px solid var(--color-accent, #D4AF37);
  outline-offset: 2px;
}

.page-about__promise-card:focus-within {
  border-color: var(--color-accent, #D4AF37);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.25);
}

/* ===== 图片通用 ===== */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 面包屑分隔符间距 ===== */
.page-about .breadcrumb span[aria-hidden="true"] {
  color: var(--color-accent-dark, #B8860B);
  font-weight: 700;
}