/* ============================================
   后台管理系统样式
   ============================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    font-size: 14px;
    background: #f0f2f5;
    color: #333;
}
a { color: #1890ff; text-decoration: none; }
a:hover { color: #40a9ff; }

/* Login Page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 400px;
}
.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 24px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: #1890ff; }
.form-group textarea { min-height: 300px; resize: vertical; }

.btn {
    display: inline-block;
    padding: 8px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    text-align: center;
    transition: opacity 0.2s;
}
.btn:hover { opacity: 0.85; text-decoration: none; }
.btn-primary { background: #1890ff; color: #fff; }
.btn-success { background: #52c41a; color: #fff; }
.btn-danger { background: #ff4d4f; color: #fff; }
.btn-warning { background: #faad14; color: #fff; }
.btn-block { width: 100%; padding: 12px; font-size: 16px; }
.btn-sm { padding: 4px 12px; font-size: 12px; }

/* Admin Layout */
.admin-header {
    background: #001529;
    color: #fff;
    padding: 0 20px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.admin-header h1 { font-size: 18px; }
.admin-header a { color: #fff; margin-left: 20px; }
.admin-header a:hover { color: #40a9ff; }

.admin-nav {
    background: #fff;
    border-bottom: 1px solid #e8e8e8;
    padding: 0 20px;
}
.admin-nav a {
    display: inline-block;
    padding: 12px 20px;
    color: #333;
    border-bottom: 2px solid transparent;
}
.admin-nav a:hover,
.admin-nav a.active { color: #1890ff; border-bottom-color: #1890ff; text-decoration: none; }

.admin-content { padding: 20px; max-width: 1200px; margin: 0 auto; }

/* Card */
.card {
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid #e8e8e8;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-header h2 { font-size: 16px; }
.card-body { padding: 20px; }

/* Table */
.table {
    width: 100%;
    border-collapse: collapse;
}
.table th, .table td {
    padding: 10px 15px;
    text-align: left;
    border-bottom: 1px solid #e8e8e8;
}
.table th { background: #fafafa; font-weight: bold; color: #555; }
.table tr:hover { background: #f5f5f5; }
.table .actions a { margin-right: 10px; }

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}
.stat-card {
    background: #fff;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-align: center;
}
.stat-card .number { font-size: 36px; font-weight: bold; color: #1890ff; }
.stat-card .label { color: #999; margin-top: 5px; }

/* Alert */
.alert {
    padding: 10px 15px;
    border-radius: 4px;
    margin-bottom: 15px;
}
.alert-success { background: #f6ffed; border: 1px solid #b7eb8f; color: #52c41a; }
.alert-error { background: #fff2f0; border: 1px solid #ffccc7; color: #ff4d4f; }