/* ===================================
   用户体验增强样式
   =================================== */

/* ---- 页面加载动画 ---- */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.page-loader.fade-out {
  opacity: 0;
  visibility: hidden;
}
.loader-content {
  text-align: center;
}
.loader-logo {
  font-size: 3rem;
  margin-bottom: 20px;
  animation: loaderFloat 1.5s ease-in-out infinite;
}
.loader-spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 16px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.loader-text {
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* 骨架屏 */
.skeleton-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 9998;
  padding: 20px;
  transition: opacity 0.3s ease;
}
.skeleton-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}
.skeleton-nav {
  height: 60px;
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
  margin-bottom: 20px;
}
.skeleton-hero {
  height: 300px;
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 16px;
  margin-bottom: 20px;
}
.skeleton-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.skeleton-card {
  height: 150px;
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 12px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes loaderFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---- Toast 提示系统 ---- */
.toast-container {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  pointer-events: none;
}
.toast-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  opacity: 0;
  transform: translateY(-20px);
  transition: all 0.3s ease;
  pointer-events: auto;
  max-width: 360px;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}
.toast-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.toast-success .toast-icon { background: #dcfce7; color: #16a34a; }
.toast-error .toast-icon { background: #fee2e2; color: #dc2626; }
.toast-warning .toast-icon { background: #fef3c7; color: #d97706; }
.toast-info .toast-icon { background: #dbeafe; color: #2563eb; }
.toast-message {
  flex: 1;
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.4;
}
.toast-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--gray-400);
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color 0.2s;
}
.toast-close:hover {
  color: var(--gray-600);
}

/* ---- 表单验证样式 ---- */
.form-input.error,
input.error,
select.error,
textarea.error {
  border-color: var(--danger) !important;
  background-color: #fef2f2;
}
.form-input.success,
input.success,
select.success,
textarea.success {
  border-color: var(--success) !important;
  background-color: #f0fdf4;
}
.field-error {
  color: var(--danger);
  font-size: 0.8rem;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.field-error::before {
  content: '!';
  width: 14px;
  height: 14px;
  background: var(--danger);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
}
.form-input:focus,
input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 134, 247, 0.1);
}

/* ---- 按钮增强 ---- */
.btn {
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0) scale(0.98);
}
.btn-clicked {
  transform: scale(0.95) !important;
}
.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}
@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* 按钮悬停效果 */
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}
.btn-secondary:hover {
  background: #e5e7eb;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(37, 99, 235, 0.05);
}

/* 触摸状态 */
.touch-active {
  opacity: 0.7;
  transform: scale(0.97);
}
.touch-device .btn:active,
.touch-device button:active {
  opacity: 0.85;
}

/* ---- 返回顶部按钮 ---- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  z-index: 999;
  -webkit-tap-highlight-color: transparent;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}
.back-to-top.clicked {
  transform: scale(0.9);
}
.back-to-top:active {
  transform: scale(0.9);
}

/* ---- 图片懒加载 ---- */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.4s ease;
}
img[loading="lazy"].loaded,
img.loaded {
  opacity: 1;
}
img[data-src] {
  opacity: 0;
  transition: opacity 0.4s ease;
}
img[data-src].loaded {
  opacity: 1;
}
img.error {
  opacity: 0.5;
}

/* ---- 滚动动画 ---- */
.animate-in {
  animation: slideUp 0.5s ease forwards;
}
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 交错动画 */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* ---- 移动端优化 ---- */
@media (max-width: 768px) {
  .page-loader,
  .skeleton-screen {
    display: none;
  }
  
  .toast-container {
    top: auto;
    bottom: 80px;
    left: 16px;
    right: 16px;
    transform: none;
  }
  .toast {
    max-width: 100%;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
  
  /* 移动端表单优化 */
  .form-group label {
    font-size: 0.85rem;
  }
  .form-input,
  input,
  select,
  textarea {
    font-size: 16px !important;
    padding: 14px 16px;
  }
  
  /* 卡片触摸优化 */
  .card,
  .grid-card,
  .guide-card {
    -webkit-tap-highlight-color: transparent;
  }
  .card:active,
  .grid-card:active,
  .guide-card:active {
    opacity: 0.9;
    transform: scale(0.99);
  }
  
  /* 导航优化 */
  .nav-links {
    -webkit-overflow-scrolling: touch;
  }
}

/* ---- 触摸设备特定优化 ---- */
.touch-device {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}
.touch-device input,
.touch-device textarea,
.touch-device select {
  user-select: auto;
}
.touch-device a,
.touch-device button {
  -webkit-tap-highlight-color: rgba(37, 99, 235, 0.1);
}

/* ---- 卡片交互优化 ---- */
.card-hover {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}
.card-hover:active {
  transform: translateY(-2px) scale(0.99);
}

/* ---- 链接悬停效果 ---- */
a {
  transition: color 0.2s ease;
}
a:hover {
  color: var(--primary);
}

/* ---- 加载状态 ---- */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--gray-500);
}
.loading .spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

/* ---- 禁用状态 ---- */
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}
.btn:disabled:hover {
  box-shadow: none;
}

/* ---- 输入框聚焦提示 ---- */
.form-input:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ---- 列表项动画 ---- */
.list-item {
  opacity: 0;
  transform: translateX(-10px);
  animation: listItemIn 0.4s ease forwards;
}
@keyframes listItemIn {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---- 平滑滚动增强 ---- */
html {
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .fade-in,
  .slide-up,
  .animate-in {
    animation: none;
    opacity: 1;
    transform: none;
  }
}