/* ============================================
   统一特效样式系统 - 炫酷动画效果
   ============================================ */

/* CSS变量定义 */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #2980b9;
  --text-color: #555;
  --light-bg: #f8f9fa;
  --border-color: #e9ecef;
  --animation-speed: 0.3s;
  --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   页面加载动画
   ============================================ */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  z-index: 99999;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
  color: white;
}

.loader-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loader-text {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 2px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================
   滚动动画 - 淡入效果
   ============================================ */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--animation-easing), transform 0.6s var(--animation-easing);
}

.fade-in-up.animated {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s var(--animation-easing), transform 0.6s var(--animation-easing);
}

.fade-in-left.animated {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s var(--animation-easing), transform 0.6s var(--animation-easing);
}

.fade-in-right.animated {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s var(--animation-easing), transform 0.6s var(--animation-easing);
}

.fade-in-scale.animated {
  opacity: 1;
  transform: scale(1);
}

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ============================================
   粒子背景效果
   ============================================ */
.particles-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(52, 152, 219, 0.3);
  animation: float 15s infinite ease-in-out;
  pointer-events: none;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) translateX(0) rotate(0deg);
    opacity: 0.3;
  }
  25% {
    transform: translateY(-100px) translateX(50px) rotate(90deg);
    opacity: 0.6;
  }
  50% {
    transform: translateY(-200px) translateX(-50px) rotate(180deg);
    opacity: 0.3;
  }
  75% {
    transform: translateY(-100px) translateX(30px) rotate(270deg);
    opacity: 0.6;
  }
}

/* ============================================
   悬停动画增强
   ============================================ */
.hover-lift {
  transition: transform var(--animation-speed) var(--animation-easing),
              box-shadow var(--animation-speed) var(--animation-easing);
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.hover-glow {
  transition: box-shadow var(--animation-speed) var(--animation-easing);
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(52, 152, 219, 0.5);
}

.hover-scale {
  transition: transform var(--animation-speed) var(--animation-easing);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-rotate {
  transition: transform var(--animation-speed) var(--animation-easing);
}

.hover-rotate:hover {
  transform: rotate(5deg);
}

/* ============================================
   渐变背景动画
   ============================================ */
.animated-gradient {
  background: linear-gradient(-45deg, #2c3e50, #3498db, #2980b9, #34495e);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ============================================
   导航栏特效
   ============================================ */
#nav {
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

#nav.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
}

#nav .list-inline-item > a {
  position: relative;
  overflow: hidden;
}

#nav .list-inline-item > a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.2), transparent);
  transition: left 0.5s ease;
}

#nav .list-inline-item > a:hover::before {
  left: 100%;
}

/* ============================================
   卡片特效增强
   ============================================ */
.advantage-card,
.ip-products-section,
.gifts-section {
  position: relative;
  overflow: hidden;
}

.advantage-card::after,
.ip-products-section::after,
.gifts-section::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.advantage-card:hover::after,
.ip-products-section:hover::after,
.gifts-section:hover::after {
  opacity: 1;
}

/* ============================================
   按钮特效
   ============================================ */
.btn-animated {
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.btn-animated::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

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

.btn-animated span {
  position: relative;
  z-index: 1;
}

/* ============================================
   文字特效
   ============================================ */
.text-shimmer {
  background: linear-gradient(90deg,
    var(--primary-color) 0%,
    var(--secondary-color) 50%,
    var(--primary-color) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: #FFF;
  animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
  to { background-position: 200% center; }
}

/* ============================================
   页面头部特效
   ============================================ */
.page-header {
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: shine 3s infinite;
}

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

/* ============================================
   滚动条美化
   ============================================ */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--secondary-color), var(--accent-color));
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-color), var(--secondary-color));
}

/* ============================================
   响应式优化
   ============================================ */
@media (max-width: 768px) {
  .fade-in-up,
  .fade-in-left,
  .fade-in-right,
  .fade-in-scale {
    transform: none;
    opacity: 1;
  }
  
  .particles-background {
    display: none;
  }
}

/* ============================================
   性能优化
   ============================================ */
.will-animate {
  will-change: transform, opacity;
}

/* 减少动画对低性能设备的负担 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}