:root {
    --primary-color: #0d6efd;
    --sidebar-bg: #212529;
    --sidebar-text: #adb5bd;
    --sidebar-hover: #fff;
    --content-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: var(--content-bg);
    min-height: 100vh;
}

.sidebar {
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    min-height: 100vh;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    color: var(--sidebar-text);
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 5px;
    transition: all 0.3s;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    color: var(--sidebar-hover);
    background-color: rgba(255,255,255,0.1);
}

.sidebar .nav-link i {
    width: 24px;
    text-align: center;
    margin-right: 10px;
}

.main-content {
    padding: 20px;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #f0f0f0;
    font-weight: 600;
    border-radius: 10px 10px 0 0 !important;
    padding: 15px 20px;
}

.table th {
    font-weight: 600;
    color: #6c757d;
    border-top: none;
}

.status-badge {
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 500;
}

.status-approved { background-color: #d1e7dd; color: #0f5132; }
.status-pending { background-color: #fff3cd; color: #664d03; }
.status-rejected { background-color: #f8d7da; color: #842029; }

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f0f2f5;
}

.login-box {
    width: 100%;
    max-width: 400px;
    padding: 30px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}