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

body {
    background-color: #fff;
    color: #1a1a1a;
    line-height: 1.6;
}

/* Container umum untuk memberi jarak sisi kiri kanan */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- HEADER --- */
header {
    background-color: #f5f5f5; /* Warna abu-abu header */
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: #000;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #555;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #000;
}

/* Hamburger Menu (Mobile) */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    transition: 0.3s;
}

/* --- HERO TITLE --- */
.hero-title {
    text-align: center;
    padding: 60px 0 40px;
}

.hero-title h1 {
    font-size: 4rem;
    font-weight: 400;
    letter-spacing: -1px;
}

/* --- FEATURES SECTION (3 KOTAK) --- */
.features {
    display: flex;
    justify-content: space-between;
    align-items: flex-start; /* Supaya rata atas */
    gap: 30px;
    margin-bottom: 80px;
}

.feature-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Placeholder Abu-abu */
.image-placeholder {
    background-color: #dcdcdc;
    width: 100%;
    margin-bottom: 25px;
}

/* Mengatur tinggi placeholder sesuai gambar referensi */
.side-img {
    height: 400px; /* Kiri dan Kanan lebih pendek */
}

.center-img {
    height: 480px; /* Tengah lebih tinggi */
}

.feature-card h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    font-weight: 500;
    max-width: 80%;
}

.feature-card p {
    font-size: 0.95rem;
    color: #555;
    max-width: 90%;
}

/* Khusus layout tengah agar turun sedikit seperti di desain (opsional) */
.feature-card.middle {
    margin-top: -20px; /* Jika ingin efek offset */
}

/* --- CONTACT SECTION --- */
.contact-section {
    padding: 60px 0 100px;
}

.contact-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 50px;
}

.contact-text {
    flex: 1;
}

.contact-text h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 500;
}

.contact-text p {
    font-size: 0.9rem;
    color: #444;
}

.contact-form {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: #333;
}

.form-input {
    width: 100%;
    padding: 15px;
    background-color: #dcdcdc; /* Input warna abu */
    border: none;
    outline: none;
    font-size: 1rem;
}

.btn-send {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 15px 40px;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 25px; /* Tombol rounded */
    align-self: flex-start;
    transition: background 0.3s;
    margin-top: 10px;
}

.btn-send:hover {
    background-color: #000;
}

/* --- RESPONSIVE / MOBILE CSS --- */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        right: -100%;
        top: 60px; /* Tinggi header kira-kira */
        flex-direction: column;
        background-color: #fff;
        width: 100%;
        text-align: center;
        padding: 20px 0;
        transition: 0.3s;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        right: 0;
    }

    .hero-title h1 {
        font-size: 2.5rem;
    }

    /* Stack Features ke bawah */
    .features {
        flex-direction: column;
        align-items: center;
    }

    .feature-card {
        width: 100%;
        margin-bottom: 40px;
    }

    .image-placeholder {
        height: 300px; /* Tinggi seragam di mobile */
    }

    .feature-card.middle {
        margin-top: 0;
    }

    /* Stack Contact Section */
    .contact-wrapper {
        flex-direction: column;
    }

    .contact-text h2 {
        font-size: 2rem;
    }
    
    .contact-form {
        width: 100%;
    }

    .btn-send {
        width: 100%; /* Tombol full width di mobile */
    }
}