/* =============================================
   页面专属：page-about（品牌档案）
   作用域限定 .page-about
   ============================================= */
.page-about {
  --hero-min-height: min(90vh, 700px);
  --timeline-accent: var(--ml-gold, #FFD700);
  --card-hover-glow: rgba(255, 215, 0, 0.12);
  --section-spacing: 5rem;
  --content-narrow: 720px;
  color: var(--ml-text-primary, #FFFFFF);
  background: var(--ml-bg-dark, #0D0D0D);
  overflow-x: hidden;
}

/* ---- 容器微调 ---- */
.page-about .ml-container {
  max-width: var(--ml-max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ---- 章节标签 ---- */
.page-about__section-tag {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--ml-gold, #FFD700);
  border: 1px solid rgba(255, 215, 0, 0.3);
  padding: 0.2rem 0.8rem;
  border-radius: var(--ml-radius-sm, 8px);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

/* =============================================
   首屏 HERO
   ============================================= */
.page-about__hero {
  position: relative;
  min-height: var(--hero-min-height);
  display: flex;
  align-items: center;
  padding: 3rem 0 5rem;
  background: linear-gradient(170deg, #0D0D0D 0%, #1A0A0A 40%, #0D0D0D 80%);
  overflow: hidden;
}

.page-about__hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  width: 100%;
  position: relative;
  z-index: 2;
}

.page-about__hero-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about__hero-kicker {
  color: var(--ml-gold, #FFD700);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  opacity: 0.8;
}

.page-about__hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.1;
  font-weight: 800;
  font-style: italic;
  color: var(--ml-text-primary, #FFFFFF);
  margin: 0;
  text-transform: uppercase;
}

.page-about__hero-title .ml-heading-accent {
  background: var(--ml-gold-gradient, linear-gradient(135deg, #FFD700, #FFA500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.page-about__hero-desc {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--ml-text-secondary, #B0B0B0);
  max-width: 480px;
  margin: 0.5rem 0;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin: 0.5rem 0;
}

.page-about__hero-meta-item {
  font-size: 0.85rem;
  color: var(--ml-text-secondary, #B0B0B0);
  border-left: 2px solid var(--ml-red, #D7001D);
  padding-left: 0.6rem;
}

.page-about__hero-cta {
  align-self: flex-start;
  margin-top: 0.75rem;
}

/* 首屏视觉区 */
.page-about__hero-visual {
  position: relative;
  aspect-ratio: 4 / 3;
  max-height: 600px;
  border-radius: var(--ml-radius-xl, 32px);
  overflow: hidden;
  border: 1px solid rgba(255, 215, 0, 0.15);
  background: var(--ml-surface-dark, #1E1E1E);
}

.page-about__hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  mix-blend-mode: luminosity;
  opacity: 0.7;
}

.page-about__hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(215, 0, 29, 0.2) 0%, transparent 50%, rgba(255, 215, 0, 0.1) 100%);
  pointer-events: none;
}

/* 动态点阵 */
.page-about__hero-dots {
  position: absolute;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  padding: 1.5rem;
  pointer-events: none;
  align-content: flex-start;
  mix-blend-mode: overlay;
}

.page-about__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ml-gold, #FFD700);
  opacity: 0;
  animation: pageAboutDotPulse 4s ease-in-out infinite;
}

.page-about__dot:nth-child(1) { animation-delay: 0.0s; }
.page-about__dot:nth-child(2) { animation-delay: 0.3s; }
.page-about__dot:nth-child(3) { animation-delay: 0.6s; }
.page-about__dot:nth-child(4) { animation-delay: 0.9s; }
.page-about__dot:nth-child(5) { animation-delay: 1.2s; }
.page-about__dot:nth-child(6) { animation-delay: 1.5s; }
.page-about__dot:nth-child(7) { animation-delay: 1.8s; }
.page-about__dot:nth-child(8) { animation-delay: 2.1s; }
.page-about__dot:nth-child(9) { animation-delay: 2.4s; }
.page-about__dot:nth-child(10) { animation-delay: 2.7s; }

@keyframes pageAboutDotPulse {
  0%, 100% { opacity: 0; transform: scale(0.6); }
  30% { opacity: 0.9; transform: scale(1.2); }
  60% { opacity: 0.4; transform: scale(0.8); }
}

/* 首屏滚动提示 */
.page-about__hero-scroll {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  opacity: 0.5;
  z-index: 2;
}

.page-about__scroll-text {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--ml-text-secondary, #B0B0B0);
  writing-mode: vertical-rl;
}

.page-about__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--ml-gold, #FFD700), transparent);
  animation: pageAboutScrollFade 2s ease-in-out infinite;
}

@keyframes pageAboutScrollFade {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* =============================================
   我们的使命
   ============================================= */
.page-about__mission {
  padding: var(--section-spacing) 0;
  position: relative;
}

.page-about__mission-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.page-about__mission-bg {
  position: relative;
  aspect-ratio: 2 / 1;
  border-radius: var(--ml-radius-lg, 24px);
  overflow: hidden;
  border: 1px solid rgba(215, 0, 29, 0.2);
  background: var(--ml-surface-dark, #1E1E1E);
}

.page-about__mission-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  mix-blend-mode: screen;
  opacity: 0.55;
}

.page-about__mission-content {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  max-width: var(--content-narrow);
}

.page-about__mission-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  font-style: italic;
  margin: 0;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__mission-text {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
}

.page-about__mission-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--ml-border-subtle, #333);
}

.page-about__stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about__stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  font-style: italic;
  line-height: 1;
}

.page-about__stat-unit {
  font-size: 0.8rem;
  color: var(--ml-text-secondary, #B0B0B0);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page-about__stat-label {
  font-size: 0.8rem;
  color: var(--ml-text-secondary, #B0B0B0);
}

/* =============================================
   技术驱动 · 时间线
   ============================================= */
.page-about__tech {
  padding: var(--section-spacing) 0;
  background: linear-gradient(180deg, rgba(215, 0, 29, 0.04) 0%, transparent 100%);
}

.page-about__tech-inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.page-about__tech-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 1rem;
}

.page-about__tech-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__tech-sub {
  font-size: 1.05rem;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
}

/* 时间线 */
.page-about__timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
  padding: 1.5rem 0;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  top: 2.5rem;
  left: 2rem;
  right: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--ml-red, #D7001D), var(--ml-gold, #FFD700), var(--ml-red, #D7001D));
  opacity: 0.3;
  z-index: 0;
}

.page-about__timeline-item {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--ml-surface-dark, #1E1E1E);
  border-radius: var(--ml-radius-md, 16px);
  border: 1px solid var(--ml-border-subtle, #333);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  cursor: default;
}

.page-about__timeline-item:hover,
.page-about__timeline-item:focus-visible {
  border-color: var(--ml-gold, #FFD700);
  box-shadow: 0 0 20px var(--card-hover-glow);
  transform: translateY(-4px);
}

.page-about__timeline-marker {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ml-gold-gradient, linear-gradient(135deg, #FFD700, #FFA500));
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.25);
  position: relative;
}

.page-about__timeline-marker::after {
  content: attr(data-timeline-step);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ml-black, #1A1A1A);
}

.page-about__timeline-content {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about__timeline-heading {
  font-size: 1rem;
  font-weight: 700;
  font-style: italic;
  margin: 0;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__timeline-desc {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
}

.page-about__timeline-time {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ml-gold, #FFD700);
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
  border-top: 1px solid rgba(255, 215, 0, 0.15);
  padding-top: 0.4rem;
}

/* 技术区视觉 */
.page-about__tech-visual {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
  aspect-ratio: 3 / 2;
  border-radius: var(--ml-radius-lg, 24px);
  overflow: hidden;
  border: 1px solid rgba(255, 215, 0, 0.1);
  background: var(--ml-surface-dark, #1E1E1E);
}

.page-about__tech-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  mix-blend-mode: screen;
  opacity: 0.5;
}

.page-about__tech-dots {
  position: absolute;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.8rem;
  padding: 1.2rem;
  pointer-events: none;
  align-content: center;
  justify-content: center;
}

.page-about__dot--small {
  width: 4px;
  height: 4px;
  background: var(--ml-data-highlight, #00FF88);
  opacity: 0.25;
  animation: pageAboutTechDot 5s ease-in-out infinite;
}

.page-about__dot--small:nth-child(1) { animation-delay: 0.0s; }
.page-about__dot--small:nth-child(2) { animation-delay: 0.6s; }
.page-about__dot--small:nth-child(3) { animation-delay: 1.2s; }
.page-about__dot--small:nth-child(4) { animation-delay: 1.8s; }
.page-about__dot--small:nth-child(5) { animation-delay: 2.4s; }
.page-about__dot--small:nth-child(6) { animation-delay: 3.0s; }

@keyframes pageAboutTechDot {
  0%, 100% { opacity: 0.1; transform: scale(0.5); }
  40% { opacity: 0.7; transform: scale(1.3); }
  70% { opacity: 0.2; transform: scale(0.8); }
}

/* =============================================
   服务承诺
   ============================================= */
.page-about__promise {
  padding: var(--section-spacing) 0;
}

.page-about__promise-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.page-about__promise-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__promise-sub {
  font-size: 1.05rem;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
}

.page-about__promise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.page-about__promise-card {
  background: var(--ml-surface-dark, #1E1E1E);
  border: 1px solid var(--ml-border-subtle, #333);
  border-radius: var(--ml-radius-lg, 24px);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.page-about__promise-card:hover {
  border-color: var(--ml-gold, #FFD700);
  box-shadow: 0 0 24px var(--card-hover-glow);
  transform: translateY(-6px);
}

.page-about__promise-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.25rem;
}

.page-about__promise-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  font-style: italic;
  margin: 0;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__promise-card-text {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
}

.page-about__promise-extra {
  max-width: var(--content-narrow);
  margin: 1.5rem auto 0;
  text-align: center;
}

.page-about__promise-extra-text {
  font-size: 0.85rem;
  color: var(--ml-text-secondary, #B0B0B0);
  border-top: 1px solid var(--ml-border-subtle, #333);
  padding-top: 1.25rem;
  margin: 0;
  line-height: 1.6;
}

/* =============================================
   联系引导
   ============================================= */
.page-about__contact {
  padding: var(--section-spacing) 0;
  background: linear-gradient(180deg, transparent, rgba(215, 0, 29, 0.06) 100%);
}

.page-about__contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.page-about__contact-content {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.page-about__contact-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  font-style: italic;
  margin: 0;
  color: var(--ml-text-primary, #FFFFFF);
}

.page-about__contact-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ml-text-secondary, #B0B0B0);
  margin: 0;
  max-width: 480px;
}

.page-about__contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.5rem 0;
}

.page-about__contact-btn--outline {
  background: transparent;
  border: 1px solid var(--ml-gold, #FFD700);
  color: var(--ml-gold, #FFD700);
}

.page-about__contact-btn--outline:hover {
  background: rgba(255, 215, 0, 0.08);
}

.page-about__contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.page-about__contact-info-item {
  font-size: 0.9rem;
  color: var(--ml-text-secondary, #B0B0B0);
  letter-spacing: 0.02em;
}

.page-about__contact-note {
  font-size: 0.8rem;
  color: var(--ml-text-secondary, #B0B0B0);
  opacity: 0.75;
  margin-top: 0.25rem;
}

.page-about__contact-visual {
  aspect-ratio: 1 / 1;
  max-width: 500px;
  border-radius: var(--ml-radius-xl, 32px);
  overflow: hidden;
  border: 1px solid rgba(255, 215, 0, 0.1);
  background: var(--ml-surface-dark, #1E1E1E);
}

.page-about__contact-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  mix-blend-mode: screen;
  opacity: 0.45;
}

/* =============================================
   响应式：移动端优先适配
   ============================================= */
@media (max-width: 768px) {
  .page-about {
    --section-spacing: 3rem;
  }

  .page-about__hero {
    min-height: auto;
    padding: 2rem 0 3rem;
  }

  .page-about__hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .page-about__hero-title {
    font-size: 2rem;
  }

  .page-about__hero-meta {
    gap: 0.75rem;
  }

  .page-about__hero-visual {
    aspect-ratio: 3 / 2;
    max-height: 320px;
    order: -1;
  }

  .page-about__hero-scroll {
    display: none;
  }

  .page-about__mission-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .page-about__mission-bg {
    aspect-ratio: 3 / 2;
    min-height: 200px;
  }

  .page-about__mission-stats {
    gap: 1.5rem;
    flex-wrap: wrap;
  }

  .page-about__stat-num {
    font-size: 1.8rem;
  }

  .page-about__timeline {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0.5rem 0;
  }

  .page-about__timeline::before {
    display: none;
  }

  .page-about__timeline-item {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 1rem;
  }

  .page-about__timeline-marker {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
  }

  .page-about__timeline-content {
    gap: 0.2rem;
  }

  .page-about__tech-visual {
    max-width: 100%;
    aspect-ratio: 3 / 2;
  }

  .page-about__promise-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .page-about__promise-card {
    padding: 1.5rem 1.25rem;
  }

  .page-about__contact-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .page-about__contact-visual {
    max-width: 100%;
    aspect-ratio: 3 / 2;
    order: -1;
  }

  .page-about__contact-text {
    max-width: 100%;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .page-about__hero-inner {
    gap: 1.5rem;
  }

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

  .page-about__timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__timeline::before {
    display: none;
  }

  .page-about__promise-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__contact-inner {
    gap: 2rem;
  }
}