/**
 * Enhanced Loading Effect - Professional Booking Submission Loading
 * 
 * 品牌沉浸式 Loading 效果
 * - 全屏遮罩 + 居中卡片
 * - 动态模块图标 + 旋转进度环
 * - 阶段性文案变化
 * - 进度点动画指示器
 * 
 * @version 1.0.0
 * @date 2026-02-05
 */

/* ==================== CSS 变量定义 ==================== */
:root {
  /* 品牌色 */
  --loading-primary: #FF6B35;
  --loading-primary-light: #FFF5F2;
  --loading-primary-rgb: 255, 107, 53;
  
  /* 文字色 */
  --loading-text-dark: #2C3E50;
  --loading-text-muted: #7F8C8D;
  
  /* 背景色 */
  --loading-bg-overlay: rgba(0, 0, 0, 0.6);
  --loading-bg-card: #FFFFFF;
  --loading-bg-tip: #F8F9FA;
  
  /* 尺寸 - 桌面端默认 */
  --loading-card-width: 400px;
  --loading-card-padding: 48px 40px;
  --loading-card-radius: 20px;
  --loading-ring-size: 120px;
  --loading-icon-size: 48px;
  --loading-title-size: 24px;
  --loading-subtitle-size: 14px;
  --loading-tip-size: 13px;
  --loading-dot-size: 10px;
  --loading-dot-gap: 12px;
  
  /* 动画 */
  --loading-transition-fast: 0.3s ease-out;
  --loading-transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==================== 遮罩层 ==================== */
.enhanced-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--loading-bg-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
}

.enhanced-loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.enhanced-loading-overlay.active .enhanced-loading-card {
  animation: cardSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ==================== 内容卡片 ==================== */
.enhanced-loading-card {
  width: var(--loading-card-width);
  max-width: 90vw;
  background: var(--loading-bg-card);
  border-radius: var(--loading-card-radius);
  padding: var(--loading-card-padding);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  text-align: center;
  opacity: 0;
  transform: translateY(-30px) scale(0.95);
}

/* ==================== 动画图标区域 ==================== */
.loading-icon-area {
  margin-bottom: 28px;
}

.progress-ring-container {
  position: relative;
  width: var(--loading-ring-size);
  height: var(--loading-ring-size);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 进度环 SVG */
.progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  animation: spinRing 1.2s linear infinite;
}

.progress-ring-bg {
  fill: none;
  stroke: var(--loading-primary-light);
  stroke-width: 4;
}

.progress-ring-circle {
  fill: none;
  stroke: var(--loading-primary);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 75;
}

/* 中心图标 */
.center-icon {
  position: relative;
  z-index: 1;
  font-size: var(--loading-icon-size);
  line-height: 1;
  animation: iconFloat 2s ease-in-out infinite;
}

/* Font Awesome 图标样式 */
.center-icon.fa-icon {
  color: var(--loading-primary);
}

/* ==================== 文案区域 ==================== */
.loading-text-area {
  margin-bottom: 24px;
}

.loading-title {
  font-size: var(--loading-title-size);
  font-weight: 700;
  color: var(--loading-text-dark);
  line-height: 1.3;
  margin: 0 0 12px 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.loading-subtitle {
  font-size: var(--loading-subtitle-size);
  font-weight: 400;
  color: var(--loading-text-muted);
  line-height: 1.5;
  margin: 0 0 20px 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 提示区域 */
.loading-tip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--loading-bg-tip);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: var(--loading-tip-size);
  color: var(--loading-text-muted);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.loading-tip .tip-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.loading-tip .tip-text {
  text-align: left;
}

/* ==================== 进度指示器 ==================== */
.progress-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--loading-dot-gap);
  margin-top: 24px;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #E0E0E0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-dot.active {
  width: var(--loading-dot-size);
  height: var(--loading-dot-size);
  background: var(--loading-primary);
  box-shadow: 0 0 8px rgba(var(--loading-primary-rgb), 0.4);
  animation: dotPulse 1.5s ease-in-out infinite;
}

/* ==================== 动画定义 ==================== */

/* 遮罩淡入 */
@keyframes overlayFadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

/* 卡片弹入 */
@keyframes cardSlideIn {
  0% {
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 卡片弹出 */
@keyframes cardSlideOut {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
}

/* 进度环旋转 */
@keyframes spinRing {
  0% {
    transform: rotate(-90deg);
  }
  100% {
    transform: rotate(270deg);
  }
}

/* 图标浮动 */
@keyframes iconFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

/* 进度点脉冲 */
@keyframes dotPulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 8px rgba(var(--loading-primary-rgb), 0.4);
  }
  50% {
    transform: scale(1.2);
    box-shadow: 0 0 16px rgba(var(--loading-primary-rgb), 0.6);
  }
}

/* 文案淡入 */
@keyframes textFadeIn {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 文案淡出 */
@keyframes textFadeOut {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* 文案切换动画类 */
.text-fade-enter {
  animation: textFadeIn 0.3s ease-out forwards;
}

.text-fade-leave {
  animation: textFadeOut 0.3s ease-in forwards;
}

/* ==================== 响应式设计 ==================== */

/* 平板端 (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --loading-card-width: 360px;
    --loading-card-padding: 40px 32px;
    --loading-card-radius: 18px;
    --loading-ring-size: 110px;
    --loading-icon-size: 44px;
    --loading-title-size: 22px;
  }
}

/* 移动端 (≤767px) */
@media (max-width: 767px) {
  :root {
    --loading-card-width: 320px;
    --loading-card-padding: 32px 24px;
    --loading-card-radius: 16px;
    --loading-ring-size: 100px;
    --loading-icon-size: 40px;
    --loading-title-size: 20px;
    --loading-subtitle-size: 13px;
    --loading-tip-size: 12px;
    --loading-dot-size: 8px;
    --loading-dot-gap: 10px;
  }
  
  .loading-tip {
    padding: 10px 14px;
  }
  
  .loading-text-area {
    margin-bottom: 20px;
  }
  
  .loading-icon-area {
    margin-bottom: 24px;
  }
}

/* 极小屏幕 (≤320px) */
@media (max-width: 320px) {
  :root {
    --loading-card-width: 280px;
    --loading-card-padding: 28px 20px;
    --loading-ring-size: 90px;
    --loading-icon-size: 36px;
    --loading-title-size: 18px;
  }
}

/* ==================== 可访问性 ==================== */

/* 尊重用户的减少动画偏好设置 */
@media (prefers-reduced-motion: reduce) {
  .enhanced-loading-overlay,
  .enhanced-loading-card,
  .progress-ring,
  .center-icon,
  .progress-dot,
  .progress-dot.active,
  .loading-title,
  .loading-subtitle,
  .loading-tip,
  .text-fade-enter,
  .text-fade-leave {
    animation: none !important;
    transition: none !important;
  }
  
  .enhanced-loading-overlay.active .enhanced-loading-card {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  
  .progress-ring {
    opacity: 0.7;
  }
  
  .progress-dot.active {
    box-shadow: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .loading-title {
    color: #000000;
  }
  
  .loading-subtitle,
  .loading-tip {
    color: #333333;
  }
  
  .progress-dot {
    background: #666666;
  }
  
  .progress-dot.active {
    background: var(--loading-primary);
    box-shadow: none;
  }
}

/* ==================== 打印样式 ==================== */
@media print {
  .enhanced-loading-overlay {
    display: none !important;
  }
}

/* ==================== 模块特定图标颜色（可选） ==================== */
.enhanced-loading-overlay[data-module="ferry"] .center-icon.fa-icon {
  color: #1976D2; /* 蓝色 - 海洋 */
}

.enhanced-loading-overlay[data-module="hotel"] .center-icon.fa-icon {
  color: #7B1FA2; /* 紫色 - 尊贵 */
}

.enhanced-loading-overlay[data-module="tour"] .center-icon.fa-icon {
  color: #388E3C; /* 绿色 - 自然 */
}

.enhanced-loading-overlay[data-module="dining"] .center-icon.fa-icon {
  color: #D32F2F; /* 红色 - 美食 */
}

.enhanced-loading-overlay[data-module="event"] .center-icon.fa-icon {
  color: #F57C00; /* 橙色 - 活力 */
}

/* 保持品牌一致性时使用统一橙色 */
.enhanced-loading-overlay.brand-color .center-icon.fa-icon {
  color: var(--loading-primary);
}