:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --bg-light: #f4f6f9;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-light);
    overflow-x: hidden;
}

/* Login Screen */
#login-screen {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.login-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

/* Dashboard Layout */
#dashboard-container {
    display: none; /* Hidden by default */
    min-height: 100vh;
}

.sidebar {
    min-height: 100vh;
    background-color: var(--primary-color);
    color: white;
    transition: all 0.3s;
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.8);
    margin-bottom: 5px;
    border-radius: 5px;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background-color: var(--accent-color);
    color: white;
}

.main-content {
    background-color: var(--bg-light);
    padding: 20px;
}

/* Cards */
.stat-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

/* Table */
.table-custom thead {
    background-color: var(--secondary-color);
    color: white;
}

/* Helper Class */
.admin-only { display: none; }

/* List Tata Tertib Custom */
.list-group-item {
    border-left: 4px solid var(--accent-color);
    margin-bottom: 5px;
    border-radius: 4px !important;
}

/* Responsiveness */
@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
    }
}