/* ============================================================
   法易 - 沉浸式视觉效果系统
   包含：视差滚动、滚动触发动画、ASCII光效、进度联动
   ============================================================ */

/* ---------- 基础变量 ---------- */
:root {
  --scroll-ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --scroll-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --scroll-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --parallax-depth-1: 0.2;
  --parallax-depth-2: 0.5;
  --parallax-depth-3: 0.8;
  --animation-duration: 0.8s;
  --stagger-delay: 0.1s;
}

/* ---------- 视差滚动容器 ---------- */
.parallax-container {
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.parallax-layer {
  position: absolute;
  inset: 0;
  will-change: transform;
  transform: translateZ(0);
}

.parallax-layer--bg {
  transform: translateZ(-200px) scale(1.2);
}

.parallax-layer--mid {
  transform: translateZ(-100px) scale(1.1);
}

.parallax-layer--front {
  transform: translateZ(0);
}

/* ---------- Hero区域视差 ---------- */
.hero-parallax {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-parallax__bg {
  position: absolute;
  inset: -20%;
  background: linear-gradient(135deg, 
    rgba(30, 58, 95, 0.05) 0%, 
    rgba(44, 82, 130, 0.08) 50%, 
    rgba(74, 144, 199, 0.05) 100%);
  will-change: transform;
  transform: translateZ(0);
}

.hero-parallax__content {
  position: relative;
  z-index: 2;
  transform: translateZ(50px);
}

/* ---------- 滚动触发动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(60px);
  transition: opacity var(--animation-duration) var(--scroll-ease-out),
              transform var(--animation-duration) var(--scroll-ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal--left {
  transform: translateX(-60px);
}

.reveal--left.revealed {
  transform: translateX(0);
}

.reveal--right {
  transform: translateX(60px);
}

.reveal--right.revealed {
  transform: translateX(0);
}

.reveal--scale {
  transform: scale(0.9);
}

.reveal--scale.revealed {
  transform: scale(1);
}

.reveal--rotate {
  transform: rotateY(15deg) translateY(40px);
  transform-style: preserve-3d;
}

.reveal--rotate.revealed {
  transform: rotateY(0) translateY(0);
}

/* 交错动画 */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s var(--scroll-ease-out),
              transform 0.6s var(--scroll-ease-out);
}

.reveal-stagger.revealed > *:nth-child(1) { transition-delay: calc(var(--stagger-delay) * 0); opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(2) { transition-delay: calc(var(--stagger-delay) * 1); opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(3) { transition-delay: calc(var(--stagger-delay) * 2); opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(4) { transition-delay: calc(var(--stagger-delay) * 3); opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(5) { transition-delay: calc(var(--stagger-delay) * 4); opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(6) { transition-delay: calc(var(--stagger-delay) * 5); opacity: 1; transform: translateY(0); }

/* ---------- 卡片悬浮效果 ---------- */
.float-card {
  transition: transform 0.4s var(--scroll-ease-out),
              box-shadow 0.4s var(--scroll-ease-out);
  will-change: transform;
}

.float-card:hover {
  transform: translateY(-8px) rotateX(2deg);
  box-shadow: 0 20px 40px rgba(30, 58, 95, 0.15);
}

/* ---------- 光晕脉冲效果 ---------- */
.glow-pulse {
  position: relative;
}

.glow-pulse::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(45deg, var(--legal-gold), var(--legal-light), var(--legal-main));
  opacity: 0;
  z-index: -1;
  filter: blur(15px);
  transition: opacity 0.3s ease;
}

.glow-pulse:hover::before {
  opacity: 0.6;
  animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.02); }
}

/* ---------- 分隔线动画 ---------- */
.animated-divider {
  position: relative;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--legal-light), transparent);
  overflow: hidden;
}

.animated-divider::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--legal-gold), transparent);
  animation: dividerSlide 3s ease-in-out infinite;
}

@keyframes dividerSlide {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ---------- 导航滚动状态 ---------- */
.header-scrolled {
  background: rgba(30, 58, 95, 0.95) !important;
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

.header-scrolled .nav-link {
  padding: 0.5rem 1rem;
}

/* ---------- 粒子背景容器 ---------- */
.particles-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ---------- ASCII光效画布 ---------- */
.ascii-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.15;
  mix-blend-mode: overlay;
}

/* ---------- 滚动触发的数字计数器 ---------- */
.counter-animate {
  font-variant-numeric: tabular-nums;
}

/* ---------- 性能优化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-stagger > *,
  .float-card,
  .glow-pulse::before,
  .animated-divider::after {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  
  .parallax-layer {
    transform: none !important;
  }
}

/* 硬件加速优化 */
.will-animate {
  will-change: transform, opacity;
  transform: translateZ(0);
}

/* ---------- 响应式适配 ---------- */
@media (max-width: 768px) {
  .hero-parallax {
    min-height: 80vh;
  }
  
  .reveal {
    transform: translateY(30px);
  }
  
  .reveal--left,
  .reveal--right {
    transform: translateY(30px);
  }
  
  .ascii-canvas {
    opacity: 0.08;
  }
}

@media (max-width: 640px) {
  .float-card:hover {
    transform: translateY(-4px);
  }
}