/* Base CSS - Reset & Common Styles */

:root {
    --primary-color: #409EFF;
    --success-color: #67C23A;
    --warning-color: #E6A23C;
    --danger-color: #F56C6C;
    --info-color: #909399;
    
    --text-primary: #303133;
    --text-regular: #606266;
    --text-secondary: #909399;
    --text-placeholder: #C0C4CC;
    
    --border-color-base: #DCDFE6;
    --border-color-light: #E4E7ED;
    --border-color-lighter: #EBEEF5;
    --border-color-extra-light: #F2F6FC;
    
    --bg-color: #f0f2f5;
    --bg-white: #ffffff;
    
    --font-size-base: 14px;
    --font-size-small: 12px;
    --font-size-large: 16px;
    
    --header-height: 60px;
    --sidebar-width: 220px;
    --sidebar-width-collapsed: 64px;
    
    --transition-time: 0.3s;
}

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

body {
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
}

a:hover {
    opacity: 0.8;
}

ul, li {
    list-style: none;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.pull-left { float: left; }
.pull-right { float: right; }

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

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

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.ml-10 { margin-left: 10px; }
.mr-10 { margin-right: 10px; }

.p-10 { padding: 10px; }
.p-20 { padding: 20px; }

.card {
    background: var(--bg-white);
    border-radius: 4px;
    border: 1px solid var(--border-color-lighter);
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
}

.card:hover {
    box-shadow: 0 4px 16px 0 rgba(0, 0, 0, 0.15);
}

.btn {
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    background: #fff;
    border: 1px solid var(--border-color-base);
    color: var(--text-regular);
    text-align: center;
    box-sizing: border-box;
    outline: none;
    margin: 0;
    transition: .1s;
    font-weight: 500;
    padding: 12px 20px;
    font-size: 14px;
    border-radius: 4px;
}

.btn:hover {
    color: var(--primary-color);
    border-color: #c6e2ff;
    background-color: #ecf5ff;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: #66b1ff;
    border-color: #66b1ff;
    color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-thumb {
    background: rgba(144, 147, 153, 0.3);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(144, 147, 153, 0.5);
}

::-webkit-scrollbar-track {
    background: transparent;
}