/* 响应式工具类 - Mobile First */

/* 基础变量 */
:root {
  --mobile-padding: 12px;
  --tablet-padding: 24px;
  --desktop-padding: 32px;
  
  --mobile-gap: 12px;
  --tablet-gap: 16px;
  --desktop-gap: 24px;
  
  --mobile-font-base: 14px;
  --tablet-font-base: 15px;
  --desktop-font-base: 16px;
  
  --touch-target-min: 44px;
  --card-radius: 16px;
  --button-radius: 12px;
}

/* 移动端优先的基础样式 */
body {
  font-size: var(--mobile-font-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 响应式容器 */
.container-responsive {
  width: 100%;
  padding-left: var(--mobile-padding);
  padding-right: var(--mobile-padding);
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 576px) {
  .container-responsive {
    max-width: 540px;
    padding-left: var(--tablet-padding);
    padding-right: var(--tablet-padding);
  }
}

@media (min-width: 992px) {
  .container-responsive {
    max-width: 960px;
    padding-left: var(--desktop-padding);
    padding-right: var(--desktop-padding);
  }
}

@media (min-width: 1200px) {
  .container-responsive {
    max-width: 1140px;
  }
}

/* 响应式间距 */
.gap-responsive {
  gap: var(--mobile-gap);
}

@media (min-width: 576px) {
  .gap-responsive {
    gap: var(--tablet-gap);
  }
}

@media (min-width: 992px) {
  .gap-responsive {
    gap: var(--desktop-gap);
  }
}

/* 响应式内边距 */
.p-responsive {
  padding: var(--mobile-padding);
}

@media (min-width: 576px) {
  .p-responsive {
    padding: var(--tablet-padding);
  }
}

@media (min-width: 992px) {
  .p-responsive {
    padding: var(--desktop-padding);
  }
}

/* 响应式字体 */
.text-responsive-xs { font-size: 0.75rem; }
.text-responsive-sm { font-size: 0.875rem; }
.text-responsive-base { font-size: 1rem; }
.text-responsive-lg { font-size: 1.125rem; }
.text-responsive-xl { font-size: 1.25rem; }
.text-responsive-2xl { font-size: 1.5rem; }
.text-responsive-3xl { font-size: 1.875rem; }

@media (min-width: 992px) {
  .text-responsive-lg { font-size: 1.25rem; }
  .text-responsive-xl { font-size: 1.5rem; }
  .text-responsive-2xl { font-size: 2rem; }
  .text-responsive-3xl { font-size: 2.5rem; }
}

/* 触摸友好的按钮 */
.btn-touch {
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--button-radius);
  transition: all 0.2s ease;
}

.btn-touch:active {
  transform: scale(0.98);
}

/* 移动端全宽按钮 */
.btn-mobile-full {
  width: 100%;
}

@media (min-width: 576px) {
  .btn-mobile-full {
    width: auto;
  }
}

/* 响应式卡片 */
.card-responsive {
  border-radius: var(--card-radius);
  background: white;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
}

.card-responsive:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

/* 响应式表格 */
.table-responsive-card {
  display: block;
  width: 100%;
}

@media (max-width: 767px) {
  .table-responsive-card thead {
    display: none;
  }
  
  .table-responsive-card tbody tr {
    display: block;
    margin-bottom: 12px;
    padding: 16px;
    background: white;
    border-radius: var(--card-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  }
  
  .table-responsive-card td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border: none;
    border-bottom: 1px solid #f0f0f0;
  }
  
  .table-responsive-card td:last-child {
    border-bottom: none;
  }
  
  .table-responsive-card td::before {
    content: attr(data-label);
    font-weight: 600;
    color: #666;
  }
}

/* 响应式导航 */
.nav-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: white;
  border-top: 1px solid #e8e8e8;
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 1000;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-bottom-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 16px;
  color: #999;
  text-decoration: none;
  font-size: 0.75rem;
  transition: color 0.2s;
}

.nav-bottom-item.active {
  color: #165DFF;
}

.nav-bottom-item i {
  font-size: 1.25rem;
}

/* 隐藏/显示工具类 */
.hide-mobile { display: none !important; }
.show-mobile { display: block !important; }

@media (min-width: 576px) {
  .hide-mobile { display: block !important; }
  .show-mobile { display: none !important; }
  .hide-tablet { display: none !important; }
}

@media (min-width: 992px) {
  .hide-tablet { display: block !important; }
  .hide-desktop { display: none !important; }
}

@media (min-width: 992px) {
  .show-desktop { display: block !important; }
}

/* 响应式网格 */
.grid-responsive {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--mobile-gap);
}

@media (min-width: 576px) {
  .grid-responsive {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--tablet-gap);
  }
}

@media (min-width: 992px) {
  .grid-responsive {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--desktop-gap);
  }
}

@media (min-width: 1200px) {
  .grid-responsive {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 响应式Flex布局 */
.flex-responsive {
  display: flex;
  flex-direction: column;
  gap: var(--mobile-gap);
}

@media (min-width: 576px) {
  .flex-responsive {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--tablet-gap);
  }
}

/* 横向滚动容器 */
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.scroll-x::-webkit-scrollbar {
  display: none;
}

/* 响应式图片 */
.img-responsive {
  max-width: 100%;
  height: auto;
}

/* 安全区域适配 (iPhone X+) */
@supports (padding-top: env(safe-area-inset-top)) {
  .safe-area-top {
    padding-top: env(safe-area-inset-top);
  }
  
  .safe-area-bottom {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* 响应式Hero区域 */
.hero-responsive {
  padding: 40px var(--mobile-padding);
  text-align: center;
}

@media (min-width: 576px) {
  .hero-responsive {
    padding: 60px var(--tablet-padding);
    text-align: left;
  }
}

@media (min-width: 992px) {
  .hero-responsive {
    padding: 80px var(--desktop-padding);
  }
}

/* 响应式表单 */
.form-responsive .form-control,
.form-responsive .form-select {
  min-height: var(--touch-target-min);
  font-size: 16px; /* 防止iOS缩放 */
}

@media (min-width: 576px) {
  .form-responsive .form-control,
  .form-responsive .form-select {
    font-size: 1rem;
  }
}

/* 响应式页脚 */
.footer-responsive {
  padding: 40px var(--mobile-padding);
  margin-bottom: 64px; /* 为底部导航留空间 */
}

@media (min-width: 576px) {
  .footer-responsive {
    padding: 60px var(--tablet-padding);
    margin-bottom: 0;
  }
}

/* 加载动画 */
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
}

/* 响应式分页 */
.pagination-responsive {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pagination-responsive .page-link {
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

/* 打印样式 */
@media print {
  .nav-bottom,
  .navbar,
  .btn,
  .no-print {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
  }
  
  .card-responsive {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}