/* CSS Umum */
body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    color: #333;
    text-align: center;
    line-height: 1.6;

    /* Properti Background Gambar (dari diskusi sebelumnya) */
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('assets/images/background.jpg');
    /* Ganti path gambar */
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    /* Gambar tetap saat scroll */
}

/* Hero Section (Bagian Paling Atas dengan Judul & Tombol) */
.hero-section {
    background-color: rgba(44, 62, 80, 0.8);
    /* Warna gelap semi-transparan */
    color: white;
    padding: 100px 20px;
    /* Padding lebih besar */
    text-align: center;
    position: relative;
    z-index: 1;
    /* Pastikan di atas background */
}

.hero-section h1 {
    font-size: 3.8em;
    /* Ukuran font lebih besar */
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
}

.hero-section p {
    font-size: 1.5em;
    /* Ukuran font lebih besar */
    margin-bottom: 50px;
    /* Jarak lebih jauh ke tombol */
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.button-group-hero {
    display: flex;
    flex-direction: column;
    /* Tombol bertumpuk di mobile */
    gap: 20px;
    /* Jarak antar tombol */
    justify-content: center;
    align-items: center;
    max-width: 700px;
    /* Batasi lebar grup tombol */
    margin: 0 auto;
}

.button-hero {
    display: inline-block;
    background-color: #1abc9c;
    /* Warna aksen (hijau/biru tosca) */
    color: white;
    padding: 18px 40px;
    /* Padding lebih besar */
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1.4em;
    /* Ukuran font lebih besar */
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 150, 136, 0.3);
    width: 100%;
    /* Ambil lebar penuh di mobile */
    max-width: 350px;
    /* Batasi lebar di desktop */
}

.button-hero:hover {
    background-color: #16a085;
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 150, 136, 0.4);
}

/* Bagian Konten Lain (Tentang Sistem, Fitur, Screenshot) */
.content-section {
    padding: 80px 20px;
    max-width: 1100px;
    /* Lebar maksimal konten */
    margin: 0 auto;
    background-color: white;
    /* Latar belakang putih */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    /* Sedikit bayangan */
    position: relative;
    z-index: 1;
    /* Pastikan di atas background */
    margin-top: -50px;
    /* Geser ke atas agar menumpuk hero sedikit */
    border-radius: 12px;
}

.content-section.dark-bg {
    background-color: #f4f7f6;
    /* Latar belakang abu-abu muda */
}

.content-section h2 {
    font-size: 2.8em;
    margin-bottom: 40px;
    color: #2c3e50;
    position: relative;
    display: inline-block;
}

.content-section h2::after {
    /* Garis bawah untuk judul section */
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background-color: #1abc9c;
    margin: 10px auto 0;
    border-radius: 2px;
}

.content-section p {
    font-size: 1.15em;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 20px;
}

/* Fitur List */
.features-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    /* Jarak antar item fitur */
    margin-top: 50px;
}

.feature-item {
    background-color: #f8f9fa;
    /* Latar belakang item fitur */
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    flex: 1 1 calc(33% - 60px);
    /* 3 kolom, dengan gap */
    min-width: 300px;
    /* Minimal lebar item */
    text-align: left;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    /* Ikon */
    font-size: 3em;
    color: #1abc9c;
    margin-bottom: 15px;
    display: block;
    text-align: center;
}

.feature-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.8em;
    text-align: center;
}

.feature-item p {
    font-size: 1em;
    color: #666;
    margin-bottom: 0;
    text-align: left;
}

/* Screenshot Section */
.screenshot-section {
    padding: 80px 20px;
    background-color: #e9ecef;
    /* Latar belakang abu-abu terang */
    position: relative;
    z-index: 1;
    /* Pastikan di atas background */
    border-radius: 12px;
    margin-top: 40px;
    /* Jarak dari section sebelumnya */
}

.screenshot-section img {
    max-width: 90%;
    height: auto;
    border: 5px solid #ddd;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    margin-top: 30px;
}

.screenshot-section p {
    margin-top: 25px;
    color: #444;
}

/* Footer */
footer {
    padding: 40px 20px;
    background-color: rgba(51, 51, 51, 0.9);
    /* Gelap semi-transparan */
    color: white;
    font-size: 1em;
    position: relative;
    z-index: 1;
    /* Pastikan di atas background */
    margin-top: 40px;
}

/* Responsive adjustments */
@media (max-width: 767px) {
    .hero-section h1 {
        font-size: 2.5em;
    }

    .hero-section p {
        font-size: 1.1em;
    }

    .button-hero {
        font-size: 1.2em;
        padding: 15px 25px;
    }

    .content-section h2 {
        font-size: 2em;
    }

    .content-section p {
        font-size: 1em;
    }

    .features-list {
        flex-direction: column;
        align-items: center;
    }

    .feature-item {
        width: 90%;
        flex: none;
    }

    .screenshot-section img {
        max-width: 100%;
    }
}

@media (min-width: 768px) {
    .button-group-hero {
        flex-direction: row;
        /* Tombol sejajar di desktop */
        gap: 30px;
    }
}