/* ==================== Base Styles ==================== */
/* 重置与基础样式 - 所有页面共用 */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
    min-height: 100vh;
}

/* ==================== 通用工具类 ==================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

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

.text-primary { color: #1890ff; }
.text-success { color: #52c41a; }
.text-warning { color: #faad14; }
.text-danger { color: #ff4d4f; }
.text-muted { color: #999; }

.bg-primary { background-color: #1890ff; }
.bg-success { background-color: #52c41a; }
.bg-warning { background-color: #faad14; }
.bg-danger { background-color: #ff4d4f; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.ml-0 { margin-left: 0; }
.ml-1 { margin-left: 8px; }
.ml-2 { margin-left: 16px; }
.mr-0 { margin-right: 0; }
.mr-1 { margin-right: 8px; }
.mr-2 { margin-right: 16px; }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: 8px; }
.pt-2 { padding-top: 16px; }
.pt-3 { padding-top: 24px; }
.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: 8px; }
.pb-2 { padding-bottom: 16px; }
.pb-3 { padding-bottom: 24px; }
.pl-0 { padding-left: 0; }
.pl-1 { padding-left: 8px; }
.pl-2 { padding-left: 16px; }
.pr-0 { padding-right: 0; }
.pr-1 { padding-right: 8px; }
.pr-2 { padding-right: 16px; }

/* ==================== 通用组件样式 ==================== */

.btn {
    display: inline-block;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: #1890ff;
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: #40a9ff;
}

.btn-success {
    background: #52c41a;
    color: #fff;
}

.btn-success:hover:not(:disabled) {
    background: #73d13d;
}

.btn-warning {
    background: #faad14;
    color: #fff;
}

.btn-warning:hover:not(:disabled) {
    background: #ffc53d;
}

.btn-danger {
    background: #ff4d4f;
    color: #fff;
}

.btn-danger:hover:not(:disabled) {
    background: #ff7875;
}

.btn-default {
    background: #fff;
    color: #333;
    border: 1px solid #d9d9d9;
}

.btn-default:hover:not(:disabled) {
    color: #40a9ff;
    border-color: #40a9ff;
}

.btn-sm {
    padding: 4px 8px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ==================== 表单元素 ==================== */

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="tel"],
input[type="search"],
textarea,
select {
    width: 100%;
    padding: 8px 12px;
    font-size: 14px;
    line-height: 1.5;
    color: #333;
    background: #fff;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus,
textarea:focus,
select:focus {
    border-color: #40a9ff;
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
}

input::placeholder,
textarea::placeholder {
    color: #bfbfbf;
}

input:disabled,
textarea:disabled,
select:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
}

/* ==================== 卡片 ==================== */

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid #f0f0f0;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 12px 20px;
    border-top: 1px solid #f0f0f0;
    background: #fafafa;
}

/* ==================== 表格 ==================== */

table {
    width: 100%;
    border-collapse: collapse;
}

table th,
table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

table th {
    font-weight: 600;
    background: #fafafa;
    color: #333;
}

table tr:hover {
    background: #fafafa;
}

table tr:last-child td {
    border-bottom: none;
}

/* ==================== 徽章 ==================== */

.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 10px;
}

.badge-primary {
    background: #e6f7ff;
    color: #1890ff;
}

.badge-success {
    background: #f6ffed;
    color: #52c41a;
}

.badge-warning {
    background: #fffbe6;
    color: #faad14;
}

.badge-danger {
    background: #fff2f0;
    color: #ff4d4f;
}

/* ==================== 加载状态 ==================== */

.spinner {
    width: 40px;
    height: 40px;
    margin: 20px auto;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #1890ff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading {
    text-align: center;
    padding: 40px;
    color: #999;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: #999;
}

/* ==================== 工具函数 ==================== */

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

.pull-left {
    float: left;
}

.pull-right {
    float: right;
}

.flex {
    display: flex;
}

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

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

.flex-wrap {
    flex-wrap: wrap;
}

/* ==================== 响应式 ==================== */

@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }

    .hidden-xs {
        display: none !important;
    }

    .card-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
}

@media (min-width: 769px) {
    .hidden-md {
        display: none !important;
    }
}