body { 
    font-family: Inter, system-ui; 
    background: #f2f2f2; 
    margin: 0; 
    padding: 0; 
}

header { 
    /* Warna disamakan dengan background body */
    background: #f2f2f2; 
    /* Warna teks diubah menjadi gelap agar kontras */
    color: #181818; 
    padding: 10px 15px; 
    
    /* Layout berjejer ke kiri */
    display: flex; 
    align-items: center; 
    justify-content: flex-start; 
    
    /* Header tetap tampil saat di-scroll */
    position: sticky;
    top: 0;
    z-index: 1000;
    /* Shadow tipis agar terlihat terpisah saat melayang */
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

header img { 
    width: 40px; 
    height: 40px; 
    border-radius: 50%; 
    /* Border disesuaikan agar tidak terlalu mencolok */
    border: 2px solid #ddd; 
    object-fit: cover;
}

header h3 {
    margin: 0;
    margin-left: 10px; 
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

h1 { 
    text-align: center; 
    margin-top: 25px; 
    font-size: 1.4rem;
    color: #181818;
}

.card { 
    background: #fff; 
    width: 90%; 
    max-width: 650px; 
    margin: 20px auto; 
    padding: 24px; 
    border-radius: 16px; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    box-sizing: border-box;
}

.cta-btn { 
    background: #000; 
    color: #fff; 
    padding: 12px 30px; 
    display: inline-block; 
    border-radius: 10px; 
    margin: 10px auto 20px auto; 
    text-decoration: none; 
    font-weight: 700; 
}

video { 
    width: 100%; 
    border-radius: 12px; 
    margin-top: 10px; 
}

footer { 
    text-align: center; 
    margin-top: 30px; 
    padding: 20px; 
    color: #666; 
    font-size: 13px; 
}