/* ERP/assets/css/responsive.css */
:root {
    --primary: #007BFF;
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
    --light: #F8F9FA;
    --dark: #343A40;
    --gray: #6C757D;
}

body {
    font-family: 'Microsoft YaHei', -apple-system, sans-serif;
    background: var(--light);
    color: var(--dark);
    margin: 0;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #0056b3, var(--primary));
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* 卡片 */
.card, .stat-card {
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

/* 按钮 */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s;
}

/* 手机端：大按钮、垂直布局 */
@media (max-width: 767px) {
    .container { padding: 15px; }
    .stat-card { padding: 20px; text-align: center; }
    .stat-card h3 { font-size: 2.5rem; }
    .btn { width: 100%; padding: 16px; font-size: 18px; margin-bottom: 12px; }
    .navbar-brand { font-size: 1.2rem; }
}

/* 电脑端：横向布局、卡片网格 */
@media (min-width: 768px) {
    .container { max-width: 1200px; margin: 0 auto; }
    .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .btn { width: auto; display: inline-block; margin-right: 10px; }
    .navbar-brand { font-size: 1.5rem; }
    .stat-card h3 { font-size: 2.8rem; }
}