/**
 * iOS Liquid Glass UI Framework
 * 液态玻璃风格 - 半透明、毛玻璃、弹性动画
 */

:root {
  /* iOS 色彩系统 */
  --ios-blue: #007AFF;
  --ios-green: #34C759;
  --ios-red: #FF3B30;
  --ios-orange: #FF9500;
  --ios-yellow: #FFCC00;
  --ios-purple: #AF52DE;
  --ios-pink: #FF2D55;
  --ios-teal: #5AC8FA;
  --ios-indigo: #5856D6;
  
  /* 灰度 */
  --ios-gray: #8E8E93;
  --ios-gray2: #AEAEB2;
  --ios-gray3: #C7C7CC;
  --ios-gray4: #D1D1D6;
  --ios-gray5: #E5E5EA;
  --ios-gray6: #F2F2F7;
  
  /* 背景 */
  --ios-bg-primary: #000000;
  --ios-bg-secondary: #1C1C1E;
  --ios-bg-tertiary: #2C2C2E;
  --ios-bg-grouped: #000000;
  --ios-bg-grouped-secondary: #1C1C1E;
  --ios-bg-grouped-tertiary: #2C2C2E;
  
  /* 文字 */
  --ios-label: #FFFFFF;
  --ios-label-secondary: rgba(255, 255, 255, 0.6);
  --ios-label-tertiary: rgba(255, 255, 255, 0.3);
  --ios-label-quaternary: rgba(255, 255, 255, 0.18);
  
  /* 分隔线 */
  --ios-separator: rgba(255, 255, 255, 0.15);
  --ios-fill: rgba(255, 255, 255, 0.1);
  --ios-fill-secondary: rgba(255, 255, 255, 0.05);
  
  /* 圆角 */
  --ios-radius-sm: 8px;
  --ios-radius-md: 12px;
  --ios-radius-lg: 16px;
  --ios-radius-xl: 20px;
  --ios-radius-2xl: 24px;
  
  /* 阴影 */
  --ios-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --ios-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --ios-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  
  /* 动画 */
  --ios-ease-out: cubic-bezier(0.32, 0.72, 0, 1);
  --ios-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ios-duration-fast: 0.2s;
  --ios-duration-normal: 0.35s;
  --ios-duration-slow: 0.5s;
}

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--ios-bg-primary);
  color: var(--ios-label);
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: calc(80px + env(safe-area-inset-bottom));
}

/* ===== 液态玻璃效果 ===== */
.ios-glass {
  background: rgba(30, 30, 30, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ios-glass-light {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.ios-glass-dark {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===== 卡片组件 ===== */
.ios-card {
  background: var(--ios-bg-secondary);
  border-radius: var(--ios-radius-xl);
  overflow: hidden;
  margin: 12px 16px;
  transition: transform var(--ios-duration-fast) var(--ios-ease-out),
              box-shadow var(--ios-duration-fast) var(--ios-ease-out);
}

.ios-card:active {
  transform: scale(0.98);
}

.ios-card-glass {
  background: rgba(44, 44, 46, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--ios-radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin: 12px 16px;
  overflow: hidden;
}

/* ===== 列表组件 ===== */
.ios-list {
  background: var(--ios-bg-secondary);
  border-radius: var(--ios-radius-xl);
  margin: 12px 16px;
  overflow: hidden;
}

.ios-list-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  min-height: 56px;
  position: relative;
  transition: background var(--ios-duration-fast) var(--ios-ease-out);
  cursor: pointer;
}

.ios-list-item:not(:last-child)::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 56px;
  right: 0;
  height: 1px;
  background: var(--ios-separator);
}

.ios-list-item:active {
  background: rgba(255, 255, 255, 0.05);
}

.ios-list-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--ios-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  flex-shrink: 0;
}

.ios-list-icon svg {
  width: 18px;
  height: 18px;
}

.ios-list-content {
  flex: 1;
  min-width: 0;
}

.ios-list-title {
  font-size: 16px;
  font-weight: 400;
  color: var(--ios-label);
}

.ios-list-subtitle {
  font-size: 13px;
  color: var(--ios-label-secondary);
  margin-top: 2px;
}

.ios-list-arrow {
  width: 20px;
  height: 20px;
  color: var(--ios-gray);
  flex-shrink: 0;
  margin-left: 8px;
}

/* ===== 按钮组件 ===== */
.ios-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--ios-duration-fast) var(--ios-ease-out);
  position: relative;
  overflow: hidden;
}

.ios-btn-primary {
  background: var(--ios-blue);
  color: white;
}

.ios-btn-primary:active {
  transform: scale(0.96);
  opacity: 0.8;
}

.ios-btn-secondary {
  background: var(--ios-gray4);
  color: var(--ios-label);
}

.ios-btn-secondary:active {
  transform: scale(0.96);
  background: var(--ios-gray3);
}

.ios-btn-glass {
  background: rgba(255, 255, 255, 0.1);
  color: var(--ios-label);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.ios-btn-glass:active {
  background: rgba(255, 255, 255, 0.15);
}

.ios-btn-block {
  width: 100%;
  margin: 8px 16px;
}

/* ===== 标签页 ===== */
.ios-segmented-control {
  display: flex;
  background: var(--ios-fill);
  border-radius: 100px;
  padding: 2px;
  margin: 12px 16px;
}

.ios-segment {
  flex: 1;
  padding: 8px 16px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  border-radius: 100px;
  color: var(--ios-label-secondary);
  transition: all var(--ios-duration-normal) var(--ios-ease-spring);
  cursor: pointer;
}

.ios-segment.active {
  background: var(--ios-gray4);
  color: var(--ios-label);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ===== 导航栏 ===== */
.ios-navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px 16px;
  padding-top: calc(12px + env(safe-area-inset-top));
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: calc(44px + env(safe-area-inset-top));
}

.ios-navbar-title {
  font-size: 17px;
  font-weight: 600;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.ios-navbar-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: background var(--ios-duration-fast);
}

.ios-navbar-btn:active {
  background: rgba(255, 255, 255, 0.2);
}

.ios-navbar-btn svg {
  width: 20px;
  height: 20px;
}

/* ===== 底部导航 ===== */
.ios-tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: env(safe-area-inset-bottom);
  display: flex;
  justify-content: space-around;
  padding-top: 8px;
}

.ios-tabbar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px 0;
  color: var(--ios-gray);
  transition: color var(--ios-duration-fast) var(--ios-ease-out);
  cursor: pointer;
  text-decoration: none;
}

.ios-tabbar-item.active {
  color: var(--ios-blue);
}

.ios-tabbar-icon {
  width: 24px;
  height: 24px;
  margin-bottom: 2px;
  transition: transform var(--ios-duration-fast) var(--ios-ease-spring);
}

.ios-tabbar-item.active .ios-tabbar-icon {
  transform: translateY(-2px);
}

.ios-tabbar-label {
  font-size: 10px;
  font-weight: 500;
}

/* ===== 输入框 ===== */
.ios-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--ios-fill);
  border: none;
  border-radius: var(--ios-radius-md);
  font-size: 16px;
  color: var(--ios-label);
  outline: none;
  transition: background var(--ios-duration-fast);
}

.ios-input::placeholder {
  color: var(--ios-label-tertiary);
}

.ios-input:focus {
  background: rgba(255, 255, 255, 0.15);
}

.ios-search {
  position: relative;
}

.ios-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--ios-gray);
}

.ios-search input {
  padding-left: 40px;
}

/* ===== 页面切换动画 ===== */
.page-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  background: var(--ios-bg-primary);
  -webkit-overflow-scrolling: touch;
}

.page-container.with-navbar {
  padding-top: calc(44px + env(safe-area-inset-top));
}

.page-container.with-tabbar {
  padding-bottom: calc(64px + env(safe-area-inset-bottom));
}

/* 页面进入/离开动画 */
.page-enter {
  animation: pageEnter var(--ios-duration-normal) var(--ios-ease-out) forwards;
}

.page-leave {
  animation: pageLeave var(--ios-duration-normal) var(--ios-ease-out) forwards;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateX(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes pageLeave {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(-30px) scale(0.95);
  }
}

/* 底部弹出动画 */
.sheet-enter {
  animation: sheetEnter var(--ios-duration-normal) var(--ios-ease-spring) forwards;
}

@keyframes sheetEnter {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

/* 弹性缩放动画 */
.bounce-scale {
  animation: bounceScale var(--ios-duration-slow) var(--ios-ease-spring);
}

@keyframes bounceScale {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); opacity: 1; }
}

/* 淡入动画 */
.fade-in {
  animation: fadeIn var(--ios-duration-normal) var(--ios-ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 交错动画 */
.stagger-item {
  opacity: 0;
  animation: staggerIn var(--ios-duration-normal) var(--ios-ease-out) forwards;
}

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

/* ===== 商品卡片 ===== */
.ios-product-card {
  background: var(--ios-bg-secondary);
  border-radius: var(--ios-radius-xl);
  overflow: hidden;
  transition: transform var(--ios-duration-fast) var(--ios-ease-out);
}

.ios-product-card:active {
  transform: scale(0.98);
}

.ios-product-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--ios-bg-tertiary);
}

.ios-product-info {
  padding: 12px;
}

.ios-product-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--ios-label);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ios-product-price {
  font-size: 18px;
  font-weight: 700;
  color: var(--ios-orange);
  margin-top: 8px;
}

.ios-product-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 12px;
  color: var(--ios-label-secondary);
}

/* ===== 头像组件 ===== */
.ios-avatar {
  border-radius: 50%;
  object-fit: cover;
  background: var(--ios-bg-tertiary);
}

.ios-avatar-sm { width: 32px; height: 32px; }
.ios-avatar-md { width: 48px; height: 48px; }
.ios-avatar-lg { width: 64px; height: 64px; }
.ios-avatar-xl { width: 80px; height: 80px; }

/* ===== 徽章 ===== */
.ios-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 6px;
  background: var(--ios-red);
  color: white;
  font-size: 11px;
  font-weight: 600;
  border-radius: 9px;
}

/* ===== 标签 ===== */
.ios-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: var(--ios-fill);
  border-radius: 100px;
  font-size: 12px;
  color: var(--ios-label-secondary);
}

.ios-tag.active {
  background: var(--ios-blue);
  color: white;
}

/* ===== Toast提示 ===== */
.ios-toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(50, 50, 50, 0.9);
  backdrop-filter: blur(10px);
  color: white;
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 14px;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ios-duration-fast);
}

.ios-toast.show {
  opacity: 1;
}

/* ===== 加载状态 ===== */
.ios-skeleton {
  background: linear-gradient(90deg, var(--ios-bg-tertiary) 25%, var(--ios-bg-secondary) 50%, var(--ios-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
  border-radius: var(--ios-radius-md);
}

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

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 0;
  height: 0;
}

/* ===== 工具类 ===== */
.text-primary { color: var(--ios-label); }
.text-secondary { color: var(--ios-label-secondary); }
.text-tertiary { color: var(--ios-label-tertiary); }
.text-blue { color: var(--ios-blue); }
.text-green { color: var(--ios-green); }
.text-red { color: var(--ios-red); }
.text-orange { color: var(--ios-orange); }

.bg-primary { background: var(--ios-bg-primary); }
.bg-secondary { background: var(--ios-bg-secondary); }
.bg-tertiary { background: var(--ios-bg-tertiary); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }

.p-4 { padding: 16px; }
.px-4 { padding-left: 16px; padding-right: 16px; }
.py-3 { padding-top: 12px; padding-bottom: 12px; }

.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }

.text-sm { font-size: 14px; }
.text-base { font-size: 16px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.hidden { display: none !important; }
.w-full { width: 100%; }
.h-full { height: 100%; }