:root {
    --primary-color: #007bff; /* Biru */
    --success-color: #28a745; /* Hijau */
    --error-color: #dc3545; /* Merah */
    --warning-color: #ffc107; /* Kuning */
    --sidebar-bg: #343a40;
    --sidebar-text: #fff;
    --content-bg: #f4f6f9;
}

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

/* Login Page */
.login-container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-color);
}

.login-card {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-card img {
    width: 150px;
    height: auto;
    margin-bottom: 1rem;
}

.login-card h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: bold;
}

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    color: #fff;
    transition: opacity 0.3s;
}

.btn-primary { background-color: var(--primary-color); }
.btn-success { background-color: var(--success-color); }
.btn-danger { background-color: var(--error-color); }
.btn-warning { background-color: var(--warning-color); }

.btn:hover {
    opacity: 0.9;
}

/* Sidebar Layout */
.wrapper {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    font-size: 1.25rem;
    font-weight: bold;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-menu {
    flex: 1;
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: background 0.3s;
}

.sidebar-menu li a:hover {
    background-color: rgba(255,255,255,0.1);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.topbar {
    height: 60px;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.content-body {
    padding: 1.5rem;
}

/* Dashboard Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}
.alert-danger { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }