/* --- 全局重置与基础样式 --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: #f4f6f9;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* --- 主题色定义 --- */
:root {
    --primary-blue: #007bff;
    --dark-blue: #0056b3;
    --light-blue: #e7f1ff;
    --white: #ffffff;
    --gray-border: #e0e0e0;
    --gray-bg: #fafafa;
    --text-muted: #888;
    --text-light: #999;
    --danger: #ff4757;
    --success: #28a745;
    --warning: #ffc107;
}

/* --- 顶部导航栏 --- */
header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    width: 1200px;
    margin: 0 auto;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-blue);
    display: flex;
    align-items: center;
}

.logo span {
    margin-left: 8px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 15px;
    color: #555;
    transition: color 0.3s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-blue);
    font-weight: bold;
}

.cart-icon {
    position: relative;
    cursor: pointer;
}

.cart-badge {
    position: absolute;
    top: -8px;
    right: -10px;
    background-color: var(--danger);
    color: white;
    font-size: 12px;
    padding: 2px 6px;
    border-radius: 10px;
}

/* --- 主体内容容器 (固定 1200px) --- */
.container {
    width: 1200px;
    margin: 20px auto;
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    min-height: 800px;
}

/* --- 页面标题 --- */
.page-title {
    font-size: 24px;
    color: #333;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-blue);
}

/* --- 按钮样式 --- */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--dark-blue);
}

.btn-secondary {
    background-color: var(--light-blue);
    color: var(--primary-blue);
}

.btn-secondary:hover {
    background-color: #d0e1ff;
}

.btn-success {
    background-color: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: var(--danger);
    color: var(--white);
}

.btn-danger:hover {
    background-color: #e03e4d;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 15px;
}

/* --- 表单样式 --- */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-border);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
}

select.form-control {
    cursor: pointer;
}

/* --- 表格样式 --- */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray-border);
}

.table th {
    background-color: var(--gray-bg);
    font-weight: bold;
    color: #555;
}

.table tbody tr:hover {
    background-color: #f9f9f9;
}

/* --- 卡片样式 --- */
.card {
    background: var(--white);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    border: 1px solid var(--gray-border);
    margin-bottom: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card-header {
    padding: 15px 20px;
    background-color: var(--gray-bg);
    border-bottom: 1px solid var(--gray-border);
    font-weight: bold;
    font-size: 16px;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    background-color: var(--gray-bg);
    border-top: 1px solid var(--gray-border);
}

/* --- 模态框样式 --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal {
    background: var(--white);
    border-radius: 8px;
    width: 600px;
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 18px;
    font-weight: bold;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
}

.modal-close:hover {
    color: #333;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--gray-border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* --- 网格布局 --- */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* --- 工具类 --- */
.text-center {
    text-align: center;
}

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

.text-muted {
    color: var(--text-muted);
}

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

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

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

/* --- 空状态 --- */
.empty-state {
    text-align: center;
    color: var(--text-light);
    padding: 60px 20px;
    border: 2px dashed #eee;
    border-radius: 6px;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

/* --- 标签 --- */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

.badge-primary {
    background-color: var(--light-blue);
    color: var(--primary-blue);
}

.badge-success {
    background-color: #d4edda;
    color: var(--success);
}

.badge-warning {
    background-color: #fff3cd;
    color: #856404;
}

.badge-danger {
    background-color: #f8d7da;
    color: var(--danger);
}

/* --- 底部 --- */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-light);
    font-size: 14px;
}