/* ===== 页面专属：.page-about ===== */
.page-about {
  --about-hero-min-height: 92vh;
  --about-section-spacing: 4rem;
  --about-card-radius: 16px;
  --about-timeline-dot-size: 18px;
  --about-accent-color: #FF6B35;

  display: block;
  width: 100%;
  color: var(--color-text, #FFFFFF);
  background-color: var(--color-primary, #0A1F3F);
  font-family: var(--font-body, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 面包屑 */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted, #B0B8C4);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.about-breadcrumb a {
  color: var(--color-text-muted, #B0B8C4);
  text-decoration: none;
  transition: color 0.2s ease;
}

.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  color: var(--color-secondary, #FF6B35);
}

.about-breadcrumb__sep {
  color: var(--color-text-muted, #B0B8C4);
  font-size: 1.1em;
  user-select: none;
}

.about-breadcrumb [aria-current="page"] {
  color: var(--color-text, #FFFFFF);
  font-weight: 500;
}

/* ===== 首屏 ===== */
.about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 2rem 1.5rem 3rem;
  box-sizing: border-box;
}

.about-hero__bg-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.about-hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.about-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,31,63,0.88) 0%, rgba(10,31,63,0.60) 60%, rgba(10,31,63,0.30) 100%);
  z-index: 1;
}

.about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-width, 1200px);
  width: 100%;
  text-align: center;
}

.about-hero__kicker {
  display: inline-block;
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-secondary, #FF6B35);
  border: 1px solid var(--color-secondary, #FF6B35);
  padding: 0.3rem 1rem;
  border-radius: 24px;
  margin-bottom: 1.5rem;
}

.about-hero__title {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 3rem;
  line-height: 1.1;
  margin: 0 0 1.25rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.about-hero__title-accent {
  display: block;
  background: var(--gradient-orange, linear-gradient(135deg, #FF6B35, #FF8C5A));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.1em;
}

.about-hero__desc {
  font-size: 1.125rem;
  max-width: 680px;
  margin: 0 auto 2.5rem;
  color: var(--color-text-muted, #B0B8C4);
  line-height: 1.7;
  text-shadow: 0 1px 8px rgba(0,0,0,0.3);
}

.about-hero__indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: about-hero-bounce 2.4s ease-in-out infinite;
}

.about-hero__indicator-line {
  width: 2px;
  height: 36px;
  background: var(--color-secondary, #FF6B35);
  border-radius: 2px;
}

.about-hero__indicator-text {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted, #B0B8C4);
  text-transform: uppercase;
}

@keyframes about-hero-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ===== 通用章节 ===== */
.about-section {
  padding: var(--about-section-spacing) 1.5rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  position: relative;
}

.about-section__header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1rem;
  margin-bottom: 2rem;
  position: relative;
}

.about-section__number {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 2.5rem;
  line-height: 1;
  background: var(--gradient-orange, linear-gradient(135deg, #FF6B35, #FF8C5A));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.6;
}

.about-section__title {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 2rem;
  line-height: 1.2;
  margin: 0;
  color: var(--color-text, #FFFFFF);
}

.about-section__accent-line {
  flex: 1;
  min-width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-secondary, #FF6B35), transparent);
  border-radius: 4px;
  align-self: center;
}

.about-highlight {
  color: var(--color-secondary, #FF6B35);
  font-weight: 700;
}

/* ===== 品牌理念 ===== */
.about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.about-mission__text {
  font-size: 1rem;
  color: var(--color-text, #FFFFFF);
}

.about-mission__lead {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.6;
  color: #FFFFFF;
  border-left: 4px solid var(--color-secondary, #FF6B35);
  padding-left: 1.25rem;
  margin-bottom: 1.25rem;
}

.about-mission__text p {
  margin-bottom: 1rem;
  color: var(--color-text-muted, #B0B8C4);
}

.about-mission__visual {
  margin: 0;
  border-radius: var(--about-card-radius);
  overflow: hidden;
  position: relative;
}

.about-mission__visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--about-card-radius);
  object-fit: cover;
}

.about-mission__caption {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted, #B0B8C4);
  text-align: center;
  font-style: italic;
}

/* 价值卡片 */
.about-mission__values {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.about-value-card {
  background: var(--color-card, #122A4A);
  border-radius: var(--about-card-radius);
  padding: 1.75rem 1.5rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.about-value-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-orange, linear-gradient(135deg, #FF6B35, #FF8C5A));
  border-radius: 0 2px 2px 0;
}

.about-value-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}

.about-value-card__icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.about-value-card__title {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
  color: var(--color-text, #FFFFFF);
}

.about-value-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted, #B0B8C4);
  margin: 0;
  line-height: 1.6;
}

/* ===== 更新历程 ===== */
.about-journey__intro {
  font-size: 1.125rem;
  color: var(--color-text-muted, #B0B8C4);
  margin-bottom: 2.5rem;
  max-width: 720px;
  line-height: 1.7;
}

/* 时间轴 */
.about-timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 2.5rem;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(180deg, var(--color-secondary, #FF6B35) 0%, rgba(255,107,53,0.2) 100%);
  border-radius: 3px;
}

.about-timeline__item {
  position: relative;
  list-style: none;
}

.about-timeline__node {
  position: absolute;
  left: -2.5rem;
  top: 6px;
  width: var(--about-timeline-dot-size);
  height: var(--about-timeline-dot-size);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-timeline__node-dot {
  width: 14px;
  height: 14px;
  background: var(--color-secondary, #FF6B35);
  border: 3px solid var(--color-primary, #0A1F3F);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--color-secondary, #FF6B35);
}

.about-timeline__card {
  background: var(--color-card, #122A4A);
  border-radius: var(--about-card-radius);
  padding: 1.5rem;
  transition: background 0.2s ease;
}

.about-timeline__card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.about-timeline__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary, #0A1F3F);
  background: var(--color-secondary, #FF6B35);
  padding: 0.2rem 0.75rem;
  border-radius: 20px;
  line-height: 1.4;
}

.about-timeline__title {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 1.25rem;
  margin: 0;
  color: var(--color-text, #FFFFFF);
  flex: 1;
}

.about-timeline__summary {
  font-size: 0.95rem;
  color: var(--color-text-muted, #B0B8C4);
  margin: 0 0 0.75rem;
  line-height: 1.6;
}

.about-timeline__detail {
  font-size: 0.9rem;
  color: var(--color-text-muted, #B0B8C4);
  line-height: 1.7;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 0.5rem;
}

.about-timeline__detail p {
  margin: 0;
}

.about-timeline__detail b {
  color: var(--color-secondary, #FF6B35);
  font-weight: 600;
}

.about-timeline__toggle {
  display: none; /* 由JS增强时显示 */
  font-family: var(--font-body, sans-serif);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-secondary, #FF6B35);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.25rem 0;
  letter-spacing: 0.03em;
  transition: opacity 0.2s ease;
}

.about-timeline__toggle:hover {
  opacity: 0.8;
}

.about-journey__figure {
  margin: 2.5rem auto 0;
  max-width: 800px;
  border-radius: var(--about-card-radius);
  overflow: hidden;
}

.about-journey__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--about-card-radius);
  object-fit: cover;
}

/* ===== 平台承诺 ===== */
.about-commitment__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.about-commitment__card {
  background: var(--color-card, #122A4A);
  border-radius: var(--about-card-radius);
  padding: 2rem 1.5rem;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.about-commitment__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}

.about-commitment__card-number {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-secondary, #FF6B35);
  opacity: 0.4;
  display: block;
  margin-bottom: 0.5rem;
}

.about-commitment__card-title {
  font-family: var(--font-heading, "Montserrat Black", sans-serif);
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
  color: var(--color-text, #FFFFFF);
}

.about-commitment__card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted, #B0B8C4);
  margin: 0;
  line-height: 1.7;
}

.about-commitment__visual {
  margin: 0 auto 2.5rem;
  max-width: 600px;
  border-radius: var(--about-card-radius);
  overflow: hidden;
}

.about-commitment__visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--about-card-radius);
  object-fit: cover;
}

.about-commitment__cta {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--color-card, #122A4A);
  border-radius: var(--about-card-radius);
  position: relative;
  overflow: hidden;
}

.about-commitment__cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-orange, linear-gradient(135deg, #FF6B35, #FF8C5A));
}

.about-commitment__cta-text {
  font-size: 1.125rem;
  color: var(--color-text, #FFFFFF);
  margin: 0 0 1.5rem;
  font-weight: 500;
}

.about-commitment__cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.about-commitment__cta-links .btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body, sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 40px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  border: none;
  cursor: pointer;
  line-height: 1.4;
}

.about-commitment__cta-links .btn:first-child {
  background: var(--gradient-orange, linear-gradient(135deg, #FF6B35, #FF8C5A));
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(255,107,53,0.3);
}

.about-commitment__cta-links .btn--outline {
  background: transparent;
  color: var(--color-secondary, #FF6B35);
  border: 2px solid var(--color-secondary, #FF6B35);
}

.about-commitment__cta-links .btn:hover,
.about-commitment__cta-links .btn:focus-visible {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 24px rgba(255,107,53,0.35);
}

.about-commitment__cta-links .btn--outline:hover {
  background: var(--color-secondary, #FF6B35);
  color: #FFFFFF;
}

/* ===== 媒体查询：平板及以上 ===== */
@media (min-width: 600px) {
  .about-hero__title {
    font-size: 4.5rem;
  }

  .about-hero__desc {
    font-size: 1.25rem;
  }

  .about-mission__values {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-commitment__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-section__title {
    font-size: 2.5rem;
  }

  .about-section__number {
    font-size: 3rem;
  }
}

/* ===== 媒体查询：桌面端 ===== */
@media (min-width: 900px) {
  .about-hero {
    min-height: 85vh;
    padding: 3rem 2rem 4rem;
  }

  .about-hero__title {
    font-size: 6rem;
  }

  .about-hero__kicker {
    font-size: 1rem;
  }

  .about-mission__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .about-mission__values {
    gap: 1.5rem;
  }

  .about-section {
    padding: 5rem 2rem;
  }

  .about-section__title {
    font-size: 3rem;
  }

  .about-section__number {
    font-size: 3.5rem;
  }

  .about-timeline {
    padding-left: 3rem;
  }

  .about-timeline::before {
    left: 16px;
  }

  .about-timeline__node {
    left: -3rem;
    top: 8px;
  }

  .about-timeline__card {
    padding: 1.75rem 2rem;
  }

  .about-timeline__title {
    font-size: 1.35rem;
  }

  .about-commitment__grid {
    gap: 2rem;
  }

  .about-commitment__card {
    padding: 2.5rem 2rem;
  }

  .about-commitment__cta {
    padding: 3rem 2rem;
  }

  .about-commitment__cta-links {
    gap: 1.25rem;
  }
}

/* ===== 媒体查询：大屏优化 ===== */
@media (min-width: 1200px) {
  .about-hero__title {
    font-size: 7rem;
  }

  .about-hero__inner {
    padding: 0 2rem;
  }

  .about-section {
    padding: 6rem 2rem;
  }
}

/* ===== 辅助 ===== */
@media (prefers-reduced-motion: reduce) {
  .about-hero__indicator {
    animation: none;
  }

  .about-value-card,
  .about-commitment__card {
    transition: none;
  }

  .about-value-card:hover,
  .about-commitment__card:hover {
    transform: none;
  }
}

/* 聚焦样式 */
.about-timeline__toggle:focus-visible,
.about-commitment__cta-links .btn:focus-visible {
  outline: 3px solid var(--color-secondary, #FF6B35);
  outline-offset: 3px;
}