:root {
    /* 主题色 - 默认白天主题 */
    --theme-primary: #667eea;
    --theme-secondary: #764ba2;
    --theme-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    --color-primary: #1890ff;
    --color-success: #52c41a;
    --color-warning: #faad14;
    --color-danger: #ff4d4f;
    --color-info: #909399;
    
    --text-color: #333333;
    --text-color-secondary: #666666;
    --text-color-placeholder: #999999;
    --text-color-disabled: #cccccc;
    
    --border-color: #e8e8e8;
    --border-color-light: #f0f0f0;
    --border-color-lighter: #fafafa;
    
    --background-color: #ffffff;
    --background-color-page: #f5f5f5;
    --background-color-hover: #f0f0f0;
    
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-base: 12px;
    --spacing-md: 16px;
    --spacing-lg: 20px;
    --spacing-xl: 24px;
    --spacing-xxl: 32px;
    
    --border-radius-sm: 2px;
    --border-radius-base: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-round: 50%;
    
    --box-shadow-base: 0 2px 8px rgba(0, 0, 0, 0.1);
    --box-shadow-light: 0 1px 4px rgba(0, 0, 0, 0.05);
    --box-shadow-dark: 0 4px 16px rgba(0, 0, 0, 0.15);
    
    --transition-duration: 0.3s;
    --transition-function: ease;
    
    --header-height: 70px;
    --footer-height: auto;
    
    --container-width: 1200px;
    --container-padding: 0 15px;
    
    /* ========================================
   应用主题色
   ======================================== */
   
   /* 新闻资讯 - 紫色渐变 */
   --color-news-start: #667eea;
   --color-news-end: #764ba2;
   --color-news-gradient: linear-gradient(135deg, var(--color-news-start) 0%, var(--color-news-end) 100%);
   
   /* 招聘求职 - 绿色渐变 */
   --color-job-start: #11998e;
   --color-job-end: #38ef7d;
   --color-job-gradient: linear-gradient(135deg, var(--color-job-start) 0%, var(--color-job-end) 100%);
   
   /* 闲置交易 - 青色渐变（代表循环、环保） */
   --color-secondhand-start: #00C9B7;
   --color-secondhand-end: #00B4D8;
   --color-secondhand-gradient: linear-gradient(135deg, var(--color-secondhand-start) 0%, var(--color-secondhand-end) 100%);
   
   /* 房屋租售 - 橙粉渐变 */
   --color-house-start: #fa709a;
   --color-house-end: #fee140;
   --color-house-gradient: linear-gradient(135deg, var(--color-house-start) 0%, var(--color-house-end) 100%);
   
   /* 到家服务 - 蓝色渐变 */
   --color-service-start: #4facfe;
   --color-service-end: #00f2fe;
   --color-service-gradient: linear-gradient(135deg, var(--color-service-start) 0%, var(--color-service-end) 100%);
   
   /* 婚恋交友 - 玫红渐变（代表浪漫、爱情） */
   --color-love-start: #FF4081;
   --color-love-end: #9C27B0;
   --color-love-gradient: linear-gradient(135deg, var(--color-love-start) 0%, var(--color-love-end) 100%);
   
   /* 同城活动 - 深橙渐变（代表活力、热闹） */
   --color-event-start: #E55B13;
   --color-event-end: #C43E00;
   --color-event-gradient: linear-gradient(135deg, var(--color-event-start) 0%, var(--color-event-end) 100%);
   
   /* ========================================
   公用样式变量
   ======================================== */
   
   /* 背景色 */
   --bg-white: #ffffff;
   --bg-gray-lightest: #f9f9f9;
   --bg-gray-light: #f5f5f5;
   --bg-gray: #f0f0f0;
   
   /* 边框色 */
   --border-light: #f0f0f0;
   --border: #e0e0e0;
   --border-dark: #333333;
   
   /* 文本色 */
   --text-dark: #333333;
   --text-medium: #666666;
   --text-light: #999999;
   --text-lightest: #cccccc;
   --text-white: #ffffff;
   
   /* 功能色 */
   --color-error: #ff6b6b;
   
   /* 图标色 */
   --icon-light: #ccc;
   --icon-lighter: #ddd;
   
   /* 特殊背景色 */
   --bg-job-light: #f5f7fa;
   --bg-job-success: #e8f8f5;
   --bg-job-info: #f0f9f8;
   --bg-job-error: #fff2f2;
   --bg-house-light: #fff5f7;
   --bg-house-border: #f0e0e5;
   --bg-house-info: #fdf0f3;
   --bg-secondhand-light: #e0f7f5;
   --bg-secondhand-hover: #b2ebf2;
   --bg-secondhand-info: #ccf5f2;
   --bg-love-light: #fce4ec;
   --bg-love-hover: #f8bbd9;
   --bg-love-info: #fce4ec;
   --bg-event-light: #fff3e0;
   --bg-event-hover: #ffe0b2;
   --bg-event-info: #fff8e1;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-duration) var(--transition-function);
}

a:hover {
    color: #40a9ff;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
    font-family: inherit;
}

input, textarea {
    font-family: inherit;
    outline: none;
}

.clearfix::after {
    content: '';
    display: block;
    clear: both;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto 20px;
    padding: var(--container-padding);
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

.mb-10 {
    margin-bottom: 10px;
}

.mb-20 {
    margin-bottom: 20px;
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}