/* ==========================================================================
   华金精铸官网 - 动画样式表 animation.css
   滚动渐入 + 交互动画 + 关键帧
   ========================================================================== */

/* ============ 1. 滚动渐入基础 ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out),
              transform 0.8s var(--ease-out);
  transition-delay: calc(var(--delay, 0) * 0.1s);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 2. 渐入变体 ============ */

/* 左侧滑入 */
[data-reveal="left"] {
  transform: translateX(-60px);
}
[data-reveal="left"].is-visible {
  transform: translateX(0);
}

/* 右侧滑入 */
[data-reveal="right"] {
  transform: translateX(60px);
}
[data-reveal="right"].is-visible {
  transform: translateX(0);
}

/* 缩放渐入 */
[data-reveal="scale"] {
  transform: scale(0.92);
}
[data-reveal="scale"].is-visible {
  transform: scale(1);
}

/* ============ 3. Hero 入场动画 ============ */
.hero-content > * {
  opacity: 0;
  animation: heroFadeUp 1s var(--ease-out) forwards;
}

.hero-title {
  animation-delay: 0.3s;
}

.hero-subtitle {
  animation-delay: 0.6s;
}

.hero-actions {
  animation-delay: 0.9s;
}

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ 4. 标题装饰线动画 ============ */
.section-header .eyebrow {
  position: relative;
  display: inline-block;
}

.section-header .eyebrow::after {
  content: '';
  display: block;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  margin: 12px auto 0;
  transition: width 0.8s var(--ease-out) 0.3s;
}

.section-header[data-reveal].is-visible .eyebrow::after,
[data-reveal].is-visible .eyebrow::after {
  width: 32px;
}

/* ============ 5. 优势卡片图标动画 ============ */
.advantage-card .advantage-icon {
  transition: transform 0.4s var(--ease);
}

.advantage-card:hover .advantage-icon {
  transform: scale(1.1) rotate(-5deg);
}

/* ============ 6. 产品卡片信息上移动画 ============ */
.product-info {
  transition: transform 0.4s var(--ease);
}

.product-card:hover .product-info {
  transform: translateY(-4px);
}

/* ============ 7. 时间轴连线渐入 ============ */
.timeline-item::before {
  transform-origin: top;
  transform: scaleY(0);
  transition: transform 0.6s var(--ease-out);
}

.timeline-item.is-active::before,
.timeline-item.is-visible::before {
  transform: scaleY(1);
}

/* ============ 8. 数字统计脉动 ============ */
.counter-number.is-counting {
  animation: pulseScale 0.4s var(--ease);
}

@keyframes pulseScale {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* ============ 9. 图片悬停缩放（通用） ============ */
.about-image img,
.quality-image img {
  transition: transform 1.2s var(--ease);
}

/* ============ 10. 按钮波纹效果 ============ */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s var(--ease), height 0.5s var(--ease);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

/* ============ 11. 导航栏链接下划线 ============ */
.nav-link::after {
  transition: width 0.3s var(--ease);
}

/* ============ 12. 返回顶部按钮 ============ */
.back-top {
  transition: all 0.3s var(--ease);
}

/* ============ 13. 品质检测卡片入场 ============ */
.quality-list li {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
  transition-delay: calc(var(--li, 0) * 0.1s);
}

.quality-list.is-visible li {
  opacity: 1;
  transform: translateX(0);
}

/* ============ 14. 瀑布流遮罩渐变 ============ */
.masonry-overlay {
  transition: opacity 0.4s var(--ease);
}

/* ============ 15. 减少动画偏好支持 ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}