body {
    font-family: 'Roboto', sans-serif;
    background-color: #fff;
    color: #333;
}
h1, h2, h3 {
    font-family: 'Roboto', sans-serif;
}
.container-custom {
    max-width: 900px;
    margin: 50px auto;
}
.app-header {
    text-align: center;
    margin-bottom: 40px;
}
.app-header img {
    width: 80px;
    height: 80px;
}
.app-header h1 {
    margin-top: 15px;
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
}
footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px 0;
    border-top: none;
    font-size: 0.9rem;
    color: #666;
}
/* Custom Card Style */
.custom-card {
    background-color: #ffffff;         /* Putih */
    border: 1px solid #e0e0e0;        /* Garis pinggir abu cerah & lembut */
    border-radius: 0.75rem;           /* Sudut tumpul */
    box-shadow: none !important;      /* Hilangkan shadow */
}

 .copy-btn {
    position: absolute;
    top: 5px;
    right: 10px;
    border: none;
    background: #f8f9fa;
    border-radius: 50%;
    padding: 6px 9px;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
    transition: background 0.3s;
}
.copy-btn:hover {
    background: #e2e6ea;
}
textarea#random_string {
    padding-right: 40px; /* beri ruang agar tidak tertutup tombol */
    resize: none;
    min-height: 80px;
}