:root {
    --color-1: rgb(0, 174, 239);   /* Biru */
    --color-2: rgb(72, 47, 146);  /* Ungu Gelap */
    --color-3: rgb(0, 180, 156);  /* Teal */
    --color-4: rgb(144, 5, 198);  /* Magenta */
    --color-5: rgb(218, 28, 92);  /* Merah/Pink */
    --bg-light: #f4f6f9;
    --text-dark: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    margin: 0;
    display: flex;
    height: 100vh; /* Wajib 100vh agar sidebar full */
    overflow: hidden; /* Mencegah scroll ganda */
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: linear-gradient(180deg, var(--color-2) 0%, var(--color-4) 100%);
    color: white;
    display: flex;
    flex-direction: column;
    transition: all 0.3s;
    flex-shrink: 0; /* Agar sidebar tidak mengecil otomatis */
}

.sidebar-header {
    padding: 20px;
    font-size: 20px;
    font-weight: bold;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    background-color: var(--color-1);
}

.menu {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
    overflow-y: auto;
}

.menu li a {
    display: block;
    padding: 15px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.menu li a:hover {
    background-color: var(--color-3);
    color: white;
}

.submenu {
    background-color: rgba(0,0,0,0.2);
}

/* Main Content */
.main-content {
    flex: 1; /* Mengambil sisa ruang */
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.topbar {
    height: 60px;
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 20px;
    flex-shrink: 0; /* Tinggi topbar tetap */
}

.content-wrapper {
    flex: 1; /* Ini penting: Mengisi sisa ruang sampai bawah */
    overflow-y: auto;
    padding: 20px;
    position: relative;
}


/* Iframe Full Screen */
iframe {
    width: 100%;
    height: 100%; /* Ambil tinggi full dari container div */
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    /* Hapus: calc(100vh - 100px); karena merusak flexbox */
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: white;
    font-weight: bold;
}
.btn-primary { background-color: var(--color-1); }
.btn-success { background-color: var(--color-3); }
.btn-danger { background-color: var(--color-5); }

/* Forms */
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}