/* static/style.css */
:root {
    --primary: #007bff;
    --primary-hover: #0056b3;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --dark: #343a40;
    --light: #f8f9fa;
    --gray: #6c757d;
    --bg-color: #f4f7f6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: #333;
    margin: 0;
    padding: 0;
}

/* 顶部导航栏 */
.navbar {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: 1px;
}

.nav-links a {
    color: var(--dark);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--primary); }
.nav-links .admin-link { color: var(--danger); font-weight: bold; }
.nav-links .logout-link { color: var(--gray); font-size: 14px; }

/* 主内容区限制宽度，保证大屏小屏都不乱 */
.main-container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* 通用卡片样式 */
.card {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.04);
    margin-bottom: 20px;
}

/* 闪现消息提示框 */
.alert {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-weight: 500;
}
.alert-success { background-color: #d4edda; color: #155724; border-left: 4px solid var(--success); }