* {
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    line-height: 1.6;
}

.header {
    background: #013d71;
    color: white;
    text-align: center;
    padding: 50px 20px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.header h1 {
    margin-bottom: 10px;
    font-size: 2.5em;
}

.navbar {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.navbar .bubble {
    display: inline-block;
    padding: 12px 18px;
    background: linear-gradient(45deg, #0e5898, #0056b3); /* Gradient biar keren */
    color: white;
    text-decoration: none;
    border-radius: 50px; /* Bubble bulat */
    border: 2px solid #fff; /* Border putih biar standout */
    font-weight: bold;
    font-size: 14px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    transition: all 0.4s ease;
    position: relative;
}

.navbar .bubble:hover {
    background: linear-gradient(45deg, #0056b3, #003d7a);
    transform: scale(1.15) translateY(-2px); /* Scale dan lift biar clickable */
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
    border-color: #ccc;
}

.navbar .bubble:active {
    transform: scale(1.05); /* Effect klik */
}

.breadcrumb {
    text-align: center;
    margin-top: 10px;
    font-size: 0.9em;
}

.breadcrumb a {
    color: #ccc;
    text-decoration: none;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: white;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.card-header {
    background: #fafdff;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    flex-wrap: wrap;
}

.btn, .btn-toggle {
    background: #0e5898;
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}

.btn:hover, .btn-toggle:hover {
    background: #0a4a7a;
}

.btn-toggle {
    margin-right: 10px;
}

.card-preview {
    padding: 25px;
    background: #f9f9f9;
}

.btn-back {
    display: inline-block;
    margin: 20px;
    color: #013d71;
    text-decoration: none;
    font-weight: bold;
}

.footer {
    background: #0e6fc4;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

/* Responsivitas */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2em;
    }
    .navbar {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .navbar .bubble {
        padding: 10px 15px;
        font-size: 12px;
    }
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .container {
        padding: 0 10px;
    }
}