/**
 * 移动端汉堡菜单样式 - 完全重写版
 * 优化性能、可访问性和用户体验
 */

/* ========================================
   CSS自定义属性 - 便于主题定制
======================================== */
:root {
  --mobile-header-height: 60px;
  --mobile-nav-width: 280px;
  --primary-color: #667eea;
  --primary-dark: #5a67d8;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-white: #ffffff;
  --bg-light: #f7fafc;
  --bg-gray: #edf2f7;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --z-mobile-nav: 9999;
  --z-mobile-backdrop: 9998;
}

/* ========================================
   基础重置和工具类
======================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.no-scroll {
  overflow: hidden !important;
}

/* ========================================
   移动端按钮显示控制
======================================== */
.mobile-search-toggle,
.mobile-menu-toggle {
  display: none;
}

@media (max-width: 768px) {
  .mobile-search-toggle,
  .mobile-menu-toggle {
    display: inline-flex;
  }
}

/* ========================================
   移动端搜索按钮
======================================== */
@media (max-width: 768px) {
  .mobile-search-toggle {
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-search-toggle:hover,
  .mobile-search-toggle:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
    outline: none;
  }

  .mobile-search-toggle:focus {
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.4);
  }

  .mobile-search-toggle:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
  }

  .mobile-search-toggle svg {
    width: 20px;
    height: 20px;
  }
}

/* ========================================
   移动端汉堡菜单按钮
======================================== */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    position: relative;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    padding: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    -webkit-tap-highlight-color: transparent;
    overflow: hidden;
  }

  .mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.02);
  }

  .mobile-menu-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
  }

  .mobile-menu-toggle:active {
    transform: scale(0.96);
    transition: transform 0.1s ease;
  }

  /* 汉堡图标容器 */
  .hamburger-icon {
    position: relative;
    width: 24px;
    height: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  /* 汉堡线条 - 优化动画性能 */
  .hamburger-line {
    display: block;
    width: 24px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all var(--transition-normal);
    transform-origin: center;
    will-change: transform, opacity;
  }

  /* 菜单激活状态 */
  .mobile-menu-toggle[aria-expanded="true"] {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
  }

  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }

  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }

  /* 点击波纹效果 */
  .mobile-menu-toggle::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
    pointer-events: none;
  }

  .mobile-menu-toggle.ripple::after {
    width: 60px;
    height: 60px;
    opacity: 0;
  }
}

/* ========================================
   移动端导航菜单
======================================== */
@media (max-width: 768px) {
  .mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-mobile-nav);
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s linear var(--transition-normal), 
                opacity var(--transition-normal);
  }

  .mobile-nav.mobile-nav-open {
    visibility: visible;
    opacity: 1;
    transition-delay: 0s;
  }

  /* 背景遮罩 */
  .mobile-nav-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    cursor: pointer;
  }

  .mobile-nav-open .mobile-nav-backdrop {
    opacity: 1;
  }

  /* 菜单面板 */
  .mobile-nav-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--mobile-nav-width);
    height: 100vh;
    background: var(--bg-white);
    box-shadow: var(--shadow-xl);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .mobile-nav-open .mobile-nav-panel {
    transform: translateX(0);
  }

  /* 菜单头部 */
  .mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
  }

  .mobile-nav-brand {
    flex: 1;
    min-width: 0;
  }

  .mobile-nav-logo {
    font-size: 18px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .mobile-nav-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-nav-close:hover,
  .mobile-nav-close:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    outline: none;
  }

  .mobile-nav-close:active {
    transform: scale(0.95);
  }

  /* 菜单内容区域 */
  .mobile-nav-content {
    flex: 1;
    padding: 24px 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  /* 搜索区域 */
  .mobile-nav-search {
    padding: 0 20px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
  }

  .search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
  }

  .search-input-wrapper input {
    flex: 1;
    width: 100%;
    padding: 12px 50px 12px 16px;
    font-size: 16px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
  }

  .search-input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  }

  .search-input-wrapper button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
  }

  .search-input-wrapper button:hover,
  .search-input-wrapper button:focus {
    background: var(--primary-dark);
    outline: none;
    transform: translateY(-50%) scale(1.05);
  }

  .search-input-wrapper button:active {
    transform: translateY(-50%) scale(0.95);
  }

  /* 导航分组 */
  .mobile-nav-section {
    margin-bottom: 32px;
  }

  .mobile-nav-section:last-child {
    margin-bottom: 0;
  }

  .mobile-nav-section-title {
    padding: 0 20px 12px 20px;
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
  }

  /* 导航菜单 */
  .mobile-nav-menu {
    list-style: none;
    padding: 16px 0 0 0;
    margin: 0;
  }

  .mobile-nav-menu li {
    margin: 0;
  }

  /* 主分类项 */
  .mobile-category-item {
    margin-bottom: 2px;
  }

  .mobile-category-header {
    display: flex;
    align-items: center;
    position: relative;
  }

  .mobile-nav-menu a {
    display: flex;
    flex: 1;
    align-items: center;
    padding: 12px 20px 8px 20px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    -webkit-tap-highlight-color: transparent;
  }

  /* 分类按钮样式（用于有子分类的项目） */
  .mobile-category-button {
    display: flex;
    flex: 1;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 20px 8px 20px;
    color: var(--text-primary);
    background: transparent;
    border: none;
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-category-button:hover,
  .mobile-category-button:focus {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
    border-left-color: var(--primary-color);
    outline: none;
  }

  .mobile-category-button:active {
    transform: translateX(2px);
    transition: transform 0.1s ease;
  }

  .mobile-category-button .toggle-icon {
    font-size: 12px;
    transition: transform var(--transition-normal);
    color: var(--text-secondary);
  }

  .mobile-category-button[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
    color: var(--primary-color);
  }

  .mobile-nav-menu a:hover,
  .mobile-nav-menu a:focus {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
    border-left-color: var(--primary-color);
    outline: none;
  }

  .mobile-nav-menu a.active {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    border-left-color: var(--primary-color);
    font-weight: 600;
  }

  .mobile-nav-menu a:active {
    transform: translateX(2px);
    transition: transform 0.1s ease;
  }


  /* 子分类列表 */
  .mobile-subcategories {
    background: var(--bg-light);
    border-left: 3px solid var(--primary-color);
    margin-left: 20px;
    margin-right: 20px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    overflow: hidden;
  }

  .mobile-subcategories li {
    margin: 0;
    border-bottom: 1px solid var(--border-color);
  }

  .mobile-subcategories li:last-child {
    border-bottom: none;
  }

  .mobile-subcategories a {
    padding: 10px 16px 6px 16px;
    font-size: 14px;
    font-weight: 400;
    color: var(--text-secondary);
    border-left: none;
    background: transparent;
    position: relative;
  }

  .mobile-subcategories a:before {
    content: '•';
    margin-right: 8px;
    color: var(--primary-color);
    font-weight: bold;
  }

  .mobile-subcategories a:hover,
  .mobile-subcategories a:focus {
    background: rgba(102, 126, 234, 0.08);
    color: var(--primary-color);
  }

  .mobile-subcategories a.active {
    background: rgba(102, 126, 234, 0.12);
    color: var(--primary-color);
    font-weight: 500;
  }

  .mobile-subcategories a.active:before {
    content: '▸';
  }

  /* 动画效果 */
  .mobile-category-item {
    transition: all var(--transition-fast);
  }

  .mobile-category-item.expanded {
    background: rgba(102, 126, 234, 0.02);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
  }



  /* 紧凑菜单变体 */
  .mobile-nav-menu-compact a {
    padding: 10px 20px 6px 20px;
    font-size: 14px;
  }

  /* 菜单底部 */
  .mobile-nav-footer {
    padding: 16px 20px;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
  }

  .mobile-nav-copyright {
    margin: 0;
    font-size: 12px;
    color: var(--text-light);
    text-align: center;
  }
}

/* ========================================
   超小屏幕优化 (<480px)
======================================== */
@media (max-width: 480px) {
  :root {
    --mobile-nav-width: 260px;
  }

  .mobile-menu-toggle {
    width: 44px !important;
    height: 44px !important;
    border-radius: var(--radius-md) !important;
  }

  .hamburger-icon {
    width: 22px !important;
    height: 16px !important;
  }

  .hamburger-line {
    width: 22px !important;
    height: 2.5px !important;
  }

  .mobile-nav-search {
    padding: 0 16px 20px 16px;
  }

  .mobile-nav-section-title {
    padding: 0 16px 10px 16px;
    font-size: 13px;
  }

  .mobile-nav-menu a {
    padding: 10px 16px;
    font-size: 14px;
  }

  .mobile-nav-menu-compact a {
    padding: 8px 16px;
    font-size: 13px;
  }
}

/* ========================================
   极小屏幕优化 (<360px)
======================================== */
@media (max-width: 360px) {
  :root {
    --mobile-nav-width: 240px;
  }

  .mobile-nav-header {
    padding: 14px 16px;
  }

  .mobile-nav-logo {
    font-size: 16px;
  }

  .mobile-nav-close {
    width: 32px;
    height: 32px;
  }

  .mobile-nav-close svg {
    width: 20px;
    height: 20px;
  }
}

/* ========================================
   横屏模式优化
======================================== */
@media (max-width: 768px) and (orientation: landscape) {
  .mobile-nav-content {
    padding: 16px 0;
  }

  .mobile-nav-section {
    margin-bottom: 24px;
  }

  .mobile-nav-menu a {
    padding: 10px 20px;
  }
}

/* ========================================
   高对比度模式支持
======================================== */
@media (prefers-contrast: high) {
  .mobile-menu-toggle {
    border-width: 2px;
  }

  .mobile-nav-menu a {
    border-left-width: 4px;
  }

  .mobile-nav-menu a:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
  }
}

/* ========================================
   动画减少模式支持
======================================== */
@media (prefers-reduced-motion: reduce) {
  .mobile-menu-toggle,
  .hamburger-line,
  .mobile-nav,
  .mobile-nav-backdrop,
  .mobile-nav-panel,
  .mobile-nav-menu a {
    transition-duration: 0.01ms;
    animation-duration: 0.01ms;
  }

  .mobile-menu-toggle::after {
    display: none;
  }
}

/* ========================================
   暗色模式支持
======================================== */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-light: #a0aec0;
    --bg-white: #1a202c;
    --bg-light: #2d3748;
    --bg-gray: #4a5568;
    --border-color: #4a5568;
  }

  .mobile-nav-backdrop {
    background: rgba(0, 0, 0, 0.7);
  }
}

/* ========================================
   触摸设备优化
======================================== */
@media (pointer: coarse) {
  .mobile-menu-toggle,
  .mobile-search-toggle,
  .mobile-nav-close,
  .mobile-nav-menu a {
    min-height: 44px;
  }

  .search-input-wrapper input {
    font-size: 16px; /* 防止iOS缩放 */
  }
}

/* ========================================
   Print样式 - 隐藏移动端菜单
======================================== */
@media print {
  .mobile-search-toggle,
  .mobile-menu-toggle,
  .mobile-nav {
    display: none !important;
  }
}