* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background: #f0f2f5;
}

.dashboard-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    position: fixed;
    height: 100vh;
}

.sidebar-header {
    padding: 30px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 span { color: #4a90e2; }

.sidebar-nav {
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 25px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: 0.3s;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

.nav-icon {
    margin-right: 12px;
    display: inline-flex;
}

.sidebar-footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.main-content {
    flex: 1;
    margin-left: 260px;
}

.top-header {
    background: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.content-wrapper {
    padding: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    margin-top: 10px;
}

.table-container {
    background: white;
    border-radius: 8px;
    overflow-x: auto;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

th {
    background: #f8f9fa;
    font-weight: 600;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-primary {
    background: #4a90e2;
    color: white;
}

.badge {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.badge-active, .badge-paid { background: #d4edda; color: #155724; }
.badge-inactive { background: #e2e3e5; color: #383d41; }
.badge-overdue { background: #f8d7da; color: #721c24; }
.badge-pending { background: #fff3cd; color: #856404; }

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    width: 400px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .sidebar { width: 70px; }
    .sidebar-header h2, .nav-item span:last-child { display: none; }
    .main-content { margin-left: 70px; }
    .nav-item { justify-content: center; }
    .nav-icon { margin-right: 0; }
}