/* ========== page-about 品牌档案专属样式 ========== */
.page-about {
  --about-gold-line: #D4AF37;
  --about-accent-bar: #FF7A00;
  --about-bg-deep: #0A1F3C;
  --about-bg-card: #122d52;
  --about-text-light: #E8ECF1;
  --about-text-muted: #8a9bb5;
  --about-timeline-dot-size: 20px;
  --about-transition: 0.3s ease;

  display: flex;
  flex-direction: column;
  gap: 0;
  background-color: var(--about-bg-deep);
  color: var(--about-text-light);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding: 24px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--about-text-muted);
}

.page-about .breadcrumb a {
  color: var(--about-text-muted);
  text-decoration: none;
  transition: color var(--about-transition);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--about-gold-line);
}

.page-about .breadcrumb__separator {
  color: var(--about-gold-line);
  font-weight: 300;
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--about-gold-line);
  font-weight: 500;
}

/* ===== 首屏 Hero ===== */
.page-about__hero {
  padding: 48px 0 64px;
}

.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: center;
}

.page-about__hero-image {
  flex-shrink: 0;
  width: 100%;
  max-width: 600px;
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(212, 175, 55, 0.15);
  clip-path: polygon(0 0, 100% 0, 100% 85%, 95% 100%, 0 100%);
}

.page-about__hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
  color: var(--white);
}

.page-about__hero-title .text--gold {
  color: var(--about-gold-line);
}

.page-about__hero-desc {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--about-text-light);
  max-width: 520px;
  margin: 0;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.page-about .btn--primary {
  background-color: var(--about-gold-line);
  color: var(--about-bg-deep);
  border: 2px solid var(--about-gold-line);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background-color: transparent;
  color: var(--about-gold-line);
}

.page-about .btn--accent {
  background-color: var(--about-accent-bar);
  color: var(--white);
  border: 2px solid var(--about-accent-bar);
}

.page-about .btn--accent:hover,
.page-about .btn--accent:focus-visible {
  background-color: transparent;
  color: var(--about-accent-bar);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: all var(--about-transition);
  cursor: pointer;
  line-height: 1.2;
}

/* ===== 品牌定位区 ===== */
.page-about__mission {
  padding: 64px 0;
  position: relative;
}

.page-about__mission::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--about-gold-line), transparent);
  opacity: 0.4;
}

.page-about__mission-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: center;
}

.page-about__mission-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about__mission-text p {
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
  color: var(--about-text-light);
}

.page-about .section__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 8px 0 0;
}

.page-about .section__number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--about-gold-line);
  line-height: 1;
  letter-spacing: 2px;
}

.page-about .section__text {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
}

.page-about .tag--accent {
  display: inline-block;
  background-color: rgba(212, 175, 55, 0.15);
  color: var(--about-gold-line);
  padding: 4px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  border-radius: 2px;
  border-left: 3px solid var(--about-gold-line);
}

.page-about__mission-image {
  flex-shrink: 0;
  width: 100%;
  max-width: 400px;
}

.page-about__mission-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  clip-path: polygon(3% 0, 100% 0, 100% 100%, 0 97%);
}

/* ===== 核心优势 ===== */
.page-about__advantages {
  padding: 64px 0;
}

.page-about__advantages-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}

.page-about__advantages-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about__advantage-card {
  background-color: var(--about-bg-card);
  padding: 32px 28px;
  position: relative;
  border: 1px solid rgba(212, 175, 55, 0.12);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  cursor: default;
}

.page-about__advantage-card:hover,
.page-about__advantage-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.3);
}

.page-about .card--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about__advantage-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 300;
  color: var(--about-gold-line);
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.6;
}

.page-about__advantage-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about__advantage-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--about-text-light);
  margin: 0 0 16px;
}

.page-about__advantage-line {
  width: 48px;
  height: 3px;
  background-color: var(--about-accent-bar);
  border-radius: 2px;
  transition: width var(--about-transition);
}

.page-about__advantage-card:hover .page-about__advantage-line {
  width: 72px;
}

/* ===== 发展历程时间线 ===== */
.page-about__timeline {
  padding: 64px 0;
  position: relative;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--about-accent-bar), transparent);
  opacity: 0.3;
}

.page-about__timeline-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 48px;
}

.page-about__timeline-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding-left: 32px;
}

.page-about__timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-gold-line), var(--about-accent-bar), var(--about-gold-line));
  opacity: 0.5;
  border-radius: 1px;
}

.page-about__timeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about__timeline-marker {
  position: absolute;
  left: -32px;
  top: 4px;
  width: var(--about-timeline-dot-size);
  height: var(--about-timeline-dot-size);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.page-about__timeline-dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--about-gold-line);
  border: 3px solid var(--about-bg-deep);
  box-shadow: 0 0 0 2px var(--about-gold-line);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about__timeline-marker:hover .page-about__timeline-dot,
.page-about__timeline-marker:focus-visible .page-about__timeline-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px var(--about-gold-line), 0 0 20px rgba(212, 175, 55, 0.3);
}

.page-about__timeline-content {
  background-color: var(--about-bg-card);
  padding: 20px 24px;
  border-radius: 4px;
  border-left: 3px solid var(--about-gold-line);
  transition: background-color var(--about-transition), border-color var(--about-transition);
}

.page-about__timeline-node:hover .page-about__timeline-content,
.page-about__timeline-node:focus-within .page-about__timeline-content {
  background-color: rgba(212, 175, 55, 0.08);
  border-left-color: var(--about-accent-bar);
}

.page-about__timeline-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 6px;
}

.page-about__timeline-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--about-text-light);
  margin: 0;
}

.page-about__timeline-image {
  margin-top: 48px;
  text-align: center;
}

.page-about__timeline-img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 4% 100%, 0 90%);
}

/* ===== 底部CTA ===== */
.page-about__cta {
  padding: 64px 0 80px;
}

.page-about__cta-inner {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(255, 122, 0, 0.05));
  border: 1px solid rgba(212, 175, 55, 0.15);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about__cta-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 12px;
}

.page-about__cta-desc {
  font-size: 1.05rem;
  color: var(--about-text-light);
  margin: 0 0 28px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* ===== 滚动显现（降级友好） ===== */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(24px);
  }

  .page-about [data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 64px 0 80px;
  }

  .page-about__hero-inner {
    flex-direction: row;
    gap: 60px;
  }

  .page-about__hero-image {
    flex: 0 0 50%;
  }

  .page-about__hero-content {
    flex: 0 0 45%;
  }

  .page-about__hero-title {
    font-size: 2.8rem;
  }

  .page-about__mission-grid {
    flex-direction: row;
    gap: 60px;
  }

  .page-about__mission-text {
    flex: 0 0 50%;
  }

  .page-about__mission-image {
    flex: 0 0 40%;
  }

  .page-about__advantages-grid {
    flex-direction: row;
    gap: 28px;
  }

  .page-about__advantage-card {
    flex: 1;
  }

  .page-about__timeline-track {
    padding-left: 60px;
  }

  .page-about__timeline-line {
    left: 28px;
  }

  .page-about__timeline-marker {
    left: -60px;
    top: 6px;
    width: 28px;
    height: 28px;
  }

  .page-about__timeline-dot {
    width: 18px;
    height: 18px;
  }

  .page-about__timeline-node {
    flex-direction: row;
    gap: 40px;
    align-items: flex-start;
  }

  .page-about__timeline-content {
    flex: 1;
    max-width: 560px;
  }

  .page-about__timeline-image {
    margin-top: 56px;
  }

  .page-about__cta-inner {
    padding: 64px 48px;
  }

  .page-about__cta-title {
    font-size: 2.2rem;
  }
}

@media (min-width: 1024px) {
  .page-about__hero-title {
    font-size: 3.2rem;
  }

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

  .page-about .section__text {
    font-size: 1.8rem;
  }

  .page-about__timeline-content {
    max-width: 620px;
  }
}

/* ===== 窄屏保护 ===== */
@media (max-width: 767px) {
  .page-about {
    overflow-x: hidden;
  }

  .page-about__hero-img,
  .page-about__mission-img,
  .page-about__timeline-img {
    width: 100%;
    height: auto;
  }

  .page-about__advantage-card {
    padding: 24px 20px;
  }

  .page-about__cta-inner {
    padding: 32px 20px;
  }

  .page-about__timeline-track {
    padding-left: 28px;
  }

  .page-about__timeline-marker {
    left: -28px;
    top: 2px;
    width: 18px;
    height: 18px;
  }

  .page-about__timeline-dot {
    width: 12px;
    height: 12px;
    border-width: 2px;
  }

  .page-about__timeline-content {
    padding: 16px 18px;
  }
}