/* 页面加载动画 - 参考国外顶级网站设计风格 */

/* 主容器 */
#loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  background: #0f0f0f;
}

/* 动态渐变背景 */
.loader-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, 
    #dc2626 0%, 
    #991b1b 20%, 
    #2563eb 50%, 
    #1d4ed8 70%, 
    #dc2626 100%
  );
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
  opacity: 0.9;
}

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

/* 网格背景 */
.loader-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(50px, 50px); }
}

/* 动态光晕效果 */
.loader-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
  animation: glowPulse 4s ease-in-out infinite;
}

.glow-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #dc2626 0%, transparent 70%);
  top: -100px;
  left: -100px;
  animation-delay: 0s;
}

.glow-2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #2563eb 0%, transparent 70%);
  bottom: -50px;
  right: -50px;
  animation-delay: 1.5s;
}

.glow-3 {
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: 3s;
}

@keyframes glowPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.4;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.6;
  }
}

/* 粒子系统容器 */
.loader-particles {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* 粒子基础样式 */
.loader-particle {
  position: absolute;
  bottom: -20px;
  border-radius: 50%;
  animation: particleFloat 6s ease-in-out infinite;
}

.particle-square {
  border-radius: 2px;
}

.particle-triangle {
  border-radius: 0;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

@keyframes particleFloat {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
    transform: translateY(-20px) translateX(calc(var(--direction) * 10px)) rotate(180deg) scale(1);
  }
  50% {
    transform: translateY(-300px) translateX(calc(var(--direction) * 50px)) rotate(360deg) scale(1);
  }
  90% {
    opacity: 0.5;
    transform: translateY(-500px) translateX(calc(var(--direction) * 30px)) rotate(540deg) scale(0.5);
  }
  100% {
    transform: translateY(-600px) translateX(calc(var(--direction) * 10px)) rotate(720deg) scale(0);
    opacity: 0;
  }
}

/* 主内容区域 */
.loader-content {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

/* Logo动画区域 */
.loader-logo-container {
  position: relative;
  width: 120px;
  height: 120px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Logo旋转环 */
.loader-logo-ring {
  position: absolute;
  border: 2px solid transparent;
  border-radius: 50%;
}

.ring-outer {
  width: 100%;
  height: 100%;
  border-top-color: rgba(255,255,255,0.8);
  border-right-color: rgba(255,255,255,0.2);
  animation: ringRotate 3s linear infinite;
}

.ring-middle {
  width: 75%;
  height: 75%;
  border-bottom-color: rgba(220,38,38,0.8);
  border-left-color: rgba(220,38,38,0.2);
  animation: ringRotate 2s linear infinite reverse;
}

.ring-inner {
  width: 50%;
  height: 50%;
  border-top-color: rgba(37,99,235,0.8);
  border-right-color: rgba(37,99,235,0.2);
  animation: ringRotate 1.5s linear infinite;
}

@keyframes ringRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Logo图标 */
.loader-logo-icon {
  width: 56px;
  height: 56px;
  animation: iconPulse 2s ease-in-out infinite;
}

@keyframes iconPulse {
  0%, 100% {
    transform: scale(1);
    filter: drop-shadow(0 0 12px rgba(220, 38, 38, 0.6)) drop-shadow(0 0 12px rgba(37, 99, 235, 0.6));
  }
  50% {
    transform: scale(1.05);
    filter: drop-shadow(0 0 24px rgba(220, 38, 38, 0.8)) drop-shadow(0 0 24px rgba(37, 99, 235, 0.8));
  }
}

/* 文字区域 */
.loader-text {
  text-align: center;
}

/* 主标题 */
.loader-title {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  perspective: 1000px;
}

.loader-title span {
  display: inline-block;
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
  background-image: linear-gradient(90deg, #fff, rgba(255,255,255,0.7), #fff);
  background-size: 200% 100%;
  animation: letterAppear 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards, textShimmer 3s linear infinite 0.5s;
  text-shadow: 0 0 40px rgba(255,255,255,0.5);
  opacity: 0;
  transform: translateY(30px) rotateX(-90deg) scale(0.5);
  filter: blur(10px);
}

/* 字母出现动画 */
@keyframes letterAppear {
  0% {
    opacity: 0;
    transform: translateY(30px) rotateX(-90deg) scale(0.5);
    filter: blur(10px);
  }
  50% {
    opacity: 0.8;
    transform: translateY(-5px) rotateX(10deg) scale(1.1);
    filter: blur(2px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) rotateX(0) scale(1);
    filter: blur(0);
  }
}

@keyframes textShimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 标题字母动画延迟 - 逐个出现（加快节奏） */
.loader-title span:nth-child(1) { animation-delay: 0.1s, 0.4s; }
.loader-title span:nth-child(2) { animation-delay: 0.18s, 0.5s; }
.loader-title span:nth-child(3) { animation-delay: 0.26s, 0.6s; }
.loader-title span:nth-child(4) { animation-delay: 0.34s, 0.7s; }
.loader-title span:nth-child(5) { animation-delay: 0.42s, 0.8s; }
.loader-title span:nth-child(6) { animation-delay: 0.5s, 0.9s; }
.loader-title span:nth-child(7) { animation-delay: 0.58s, 1s; }
.loader-title span:nth-child(8) { animation-delay: 0.66s, 1.1s; }   /* 分隔符 */
.loader-title span:nth-child(9) { animation-delay: 0.74s, 1.2s; }  /* A */
.loader-title span:nth-child(10) { animation-delay: 0.82s, 1.3s; } /* d */
.loader-title span:nth-child(11) { animation-delay: 0.9s, 1.4s; } /* v */

/* 标题分隔符 */
.title-divider {
  font-size: 0.8em;
  color: rgba(255,255,255,0.5) !important;
  animation: letterAppear 0.3s ease-out 0.66s forwards, dividerBlink 0.8s ease-in-out infinite 1.1s !important;
}

@keyframes dividerBlink {
  0%, 50% { opacity: 0.3; }
  51%, 100% { opacity: 1; }
}

/* 副标题 */
.loader-subtitle {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 300;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.subtitle-word {
  opacity: 0;
  animation: wordFadeIn 0.6s ease-out forwards;
}

.subtitle-word:nth-child(1) { animation-delay: 0.8s; }
.subtitle-word:nth-child(2) { animation-delay: 0.95s; }
.subtitle-word:nth-child(3) { animation-delay: 1.1s; }

@keyframes wordFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 进度指示器容器 */
.loader-progress-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

/* 进度条包装器 */
.loader-progress-bar-wrapper {
  position: relative;
  width: 280px;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  overflow: hidden;
}

/* 进度条 */
.loader-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, 
    rgba(220,38,38,0.8), 
    #fff, 
    rgba(37,99,235,0.8)
  );
  background-size: 200% 100%;
  border-radius: 2px;
  transition: width 0.1s ease-out;
  animation: progressShimmer 2s linear infinite;
}

@keyframes progressShimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 进度条发光效果 */
.loader-progress-glow {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent, 
    rgba(255,255,255,0.3), 
    transparent
  );
  transform: translateY(-50%);
  animation: glowMove 1.5s ease-in-out infinite;
}

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

/* 进度文字 */
.loader-progress-text {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.1em;
}

/* 状态点 */
.loader-status-dots {
  display: flex;
  gap: 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  animation: dotPulse 1.5s ease-in-out infinite;
}

.dot-1 { animation-delay: 0s; }
.dot-2 { animation-delay: 0.3s; }
.dot-3 { animation-delay: 0.6s; }

@keyframes dotPulse {
  0%, 60%, 100% {
    transform: scale(1);
    background: rgba(255,255,255,0.3);
  }
  30% {
    transform: scale(1.3);
    background: #fff;
    box-shadow: 0 0 10px rgba(255,255,255,0.8);
  }
}

/* 底部装饰线 */
.loader-bottom-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #dc2626, #2563eb);
  animation: lineGrow 2s ease-out forwards;
}

@keyframes lineGrow {
  from { width: 0%; }
  to { width: 100%; }
}

/* 退出动画 */
#loader-wrapper.loader-exit {
  animation: loaderExit 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes loaderExit {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.02);
  }
  100% {
    opacity: 0;
    transform: scale(0.98);
    pointer-events: none;
  }
}

/* 退出时文字效果 */
#loader-wrapper.loader-exit .loader-title span {
  animation: letterFlyAway 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes letterFlyAway {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(-80px) scale(1.5);
  }
}

/* 退出时副标题效果 */
#loader-wrapper.loader-exit .loader-subtitle {
  animation: subtitleFadeDown 0.6s ease-out forwards;
}

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

/* 退出时Logo效果 */
#loader-wrapper.loader-exit .loader-logo-container {
  animation: logoShrink 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes logoShrink {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(0);
    opacity: 0;
  }
}

/* 退出时进度条效果 */
#loader-wrapper.loader-exit .loader-progress-container {
  animation: progressFade 0.5s ease-out forwards;
}

@keyframes progressFade {
  from {
    opacity: 1;
    transform: scaleX(1);
  }
  to {
    opacity: 0;
    transform: scaleX(0);
  }
}

/* 退出时粒子效果 */
#loader-wrapper.loader-exit .loader-particle {
  animation: particleExplode 0.5s ease-out forwards !important;
}

@keyframes particleExplode {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(2);
  }
}

/* 响应式调整 */
@media (max-width: 768px) {
  .loader-title {
    font-size: clamp(1.8rem, 10vw, 3rem);
    letter-spacing: 0.1em;
  }
  
  .loader-subtitle {
    font-size: clamp(0.8rem, 3vw, 1.1rem);
    gap: 8px;
  }
  
  .loader-progress-bar-wrapper {
    width: 200px;
  }
  
  .loader-logo-container {
    width: 90px;
    height: 90px;
  }
  
  .loader-logo-icon {
    width: 36px;
    height: 36px;
  }
}