/* 兼容性增强CSS - 支持旧版本浏览器 */

/* 重置和基础样式 */
* {
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #333;
    background-color: #f5f5f5;
}

/* Flexbox兼容性 - 降级到float布局 */
.flex-container {
    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: flex;
}

.flex-item {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -moz-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

/* 对于不支持flexbox的浏览器，使用float布局 */
.no-flexbox .flex-container {
    display: block;
    overflow: hidden;
}

.no-flexbox .flex-item {
    float: left;
    width: 50%;
}

.no-flexbox .flex-item:after {
    content: "";
    display: table;
    clear: both;
}

/* Transform兼容性 */
.transform-element {
    -webkit-transform: translateY(-1px);
    -moz-transform: translateY(-1px);
    -ms-transform: translateY(-1px);
    -o-transform: translateY(-1px);
    transform: translateY(-1px);
}

/* Transition兼容性 */
.transition-element {
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}

/* Box-shadow兼容性 */
.shadow-element {
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Border-radius兼容性 */
.rounded-element {
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    border-radius: 8px;
}

/* Linear-gradient兼容性 */
.gradient-element {
    background: #ff6b6b; /* 降级颜色 */
    background: -webkit-linear-gradient(135deg, #ff6b6b, #ff5252);
    background: -moz-linear-gradient(135deg, #ff6b6b, #ff5252);
    background: -ms-linear-gradient(135deg, #ff6b6b, #ff5252);
    background: -o-linear-gradient(135deg, #ff6b6b, #ff5252);
    background: linear-gradient(135deg, #ff6b6b, #ff5252);
}

/* 移动端适配 */
@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    .mobile-padding {
        padding: 10px;
    }
    
    .mobile-button {
        padding: 12px 20px;
        font-size: 16px;
        min-height: 44px; /* iOS推荐的最小触摸目标 */
    }
}

/* iOS Safari特殊处理 */
@supports (-webkit-touch-callout: none) {
    .ios-input {
        -webkit-appearance: none;
        border-radius: 0;
    }
    
    .ios-button {
        -webkit-appearance: none;
        border-radius: 0;
    }
}

/* Android WebView特殊处理 */
.android-webview {
    -webkit-overflow-scrolling: touch;
}

/* 触摸优化 */
.touch-element {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* 滚动优化 */
.scroll-container {
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
}

/* 输入框优化 */
input, textarea {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border-radius: 0;
}

/* 按钮优化 */
button {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border: none;
    background: none;
    cursor: pointer;
}

/* 防止缩放 */
.no-zoom {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* 隐藏滚动条但保持滚动功能 */
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
    display: none;
}