/* Variabel Warna */
:root {
    --color-blue: #007bff; /* Biru Utama */
    --color-black: #1a1a1a; /* Hitam Teks/Background */
    --color-yellow: #ffc107; /* Kuning Aksen */
    --color-white: #ffffff;
    --color-dark-gray: #333;
}

/* Reset dan Tipografi Dasar */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--color-dark-gray);
    background-color: var(--color-white);
}

a {
    text-decoration: none;
    color: var(--color-blue);
    transition: color 0.3s;
}

a:hover {
    color: var(--color-yellow);
}

/* Header/Navigasi */
header {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px; /* Sesuaikan ukuran logo */
    margin-right: 10px;
}

.logo span {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--color-white);
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: var(--color-white);
    font-weight: 600;
    padding: 5px 10px;
}

nav ul li a:hover {
    color: var(--color-yellow);
}

.btn-contact {
    background-color: var(--color-blue);
    padding: 8px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.btn-contact:hover {
    background-color: #0056b3; /* Biru lebih gelap saat hover */
    color: var(--color-white);
}

/* Bagian Utama (Hero) - Dinamis dan Modern */
.hero {
    background: var(--color-black); /* Latar belakang hitam */
    padding: 100px 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 80vh; /* Tinggi minimum agar terlihat dinamis */
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Rekomendasi Background: Overlay Teknologi */
    background: radial-gradient(circle at top right, rgba(0, 123, 255, 0.2), transparent 50%),
                radial-gradient(circle at bottom left, rgba(255, 193, 7, 0.1), transparent 50%);
    z-index: 1;
}

.hero-content, .hero-image {
    position: relative;
    z-index: 2;
    flex: 1;
}

.hero-content {
    max-width: 50%;
    margin-right: 30px;
}

.hero h1 {
    font-size: 3.5em;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-yellow); /* Judul dengan warna kuning */
}

.hero p {
    font-size: 1.2em;
    margin-bottom: 30px;
    color: #ccc;
}

.cta-button {
    background-color: var(--color-blue);
    color: var(--color-white);
    padding: 12px 25px;
    border-radius: 30px;
    font-size: 1.1em;
    font-weight: 600;
    display: inline-block;
    transition: background-color 0.3s, transform 0.3s;
}

.cta-button:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.hero-image {
    text-align: right;
    /* Placeholder untuk gambar/diagram */
}

/* Bagian Fitur */
.features {
    padding: 60px 5%;
    text-align: center;
    background-color: #f4f7f9;
}

.features h2 {
    font-size: 2.2em;
    margin-bottom: 40px;
    color: var(--color-blue);
}

.feature-grid {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-card {
    background-color: var(--color-white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    max-width: 300px;
    text-align: left;
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 5px solid var(--color-yellow); /* Aksen kuning */
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.feature-card h3 {
    color: var(--color-dark-gray);
    margin-bottom: 15px;
    font-size: 1.5em;
}

/* Bagian Tentang Kami */
.about {
    padding: 80px 5%;
    text-align: center;
    background-color: var(--color-blue);
    color: var(--color-white);
}

.about h2 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.about p {
    font-size: 1.1em;
    max-width: 700px;
    margin: 0 auto 30px auto;
}

.btn-primary {
    background-color: var(--color-yellow);
    color: var(--color-black);
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #ffd43b;
}

/* Footer */
footer {
    background-color: var(--color-dark-gray);
    color: #ccc;
    text-align: center;
    padding: 20px 5%;
    font-size: 0.9em;
}

footer a {
    color: var(--color-yellow);
    margin: 0 10px;
}

footer a:hover {
    color: var(--color-white);
}

/* --- Media Queries untuk Responsivitas --- */

/* Tablet (Maksimal Lebar 992px) */
@media (max-width: 992px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 80px 5%;
    }

    .hero-content {
        max-width: 100%;
        margin: 0 0 40px 0;
    }

    .hero h1 {
        font-size: 2.8em;
    }

    .hero-image {
        display: none; /* Sembunyikan gambar pada tablet/mobile agar fokus ke konten */
    }

    .feature-grid {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .feature-card {
        max-width: 90%;
    }
}

/* Mobile (Maksimal Lebar 600px) */
@media (max-width: 600px) {
    header {
        flex-direction: column;
        padding: 15px 5%;
    }

    nav ul {
        margin-top: 10px;
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 5px 0;
    }

    .logo span {
        font-size: 1.3em;
    }

    .hero {
        padding: 60px 5%;
        min-height: 60vh;
    }

    .hero h1 {
        font-size: 2.2em;
    }

    .hero p {
        font-size: 1em;
    }

    .features, .about {
        padding: 40px 5%;
    }
}