:root {
    --primary-dark: #0a0000;
    --secondary-dark: #1a0505;
    --accent-red: #d30000;
    --accent-red-hover: #ff1a1a;
    --text-light: #f4f4f4;
    --text-muted: #aaaaaa;
    --border-color: #330000;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Open Sans', sans-serif;
    background-color: var(--primary-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Montserrat', sans-serif;
    color: var(--accent-red);
    margin-bottom: 1rem;
    line-height: 1.3;
}

p {
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    color: #dcdcdc;
    text-align: justify;
}

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

a:hover {
    color: var(--accent-red-hover);
    text-decoration: underline;
}

/* Full Bar Navigation */
header {
    background-color: var(--secondary-dark);
    border-bottom: 2px solid var(--accent-red);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(211, 0, 0, 0.2);
}

.logo img {
    max-height: 50px;
    width: auto;
}

.nav-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 25px;
    border-radius: 5px;
    font-weight: 800;
    font-family: 'Montserrat', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-login {
    background-color: transparent;
    border: 2px solid var(--accent-red);
    color: var(--accent-red);
}

.btn-login:hover {
    background-color: var(--accent-red);
    color: #fff;
    text-decoration: none;
}

.btn-daftar {
    background-color: var(--accent-red);
    border: 2px solid var(--accent-red);
    color: #fff;
    box-shadow: 0 0 10px rgba(211, 0, 0, 0.5);
}

.btn-daftar:hover {
    background-color: var(--accent-red-hover);
    border-color: var(--accent-red-hover);
    box-shadow: 0 0 20px rgba(255, 26, 26, 0.8);
    text-decoration: none;
    color: #fff;
}

/* Main Hero Section */
.hero-section {
    width: 100%;
    background-color: var(--secondary-dark);
    padding: 40px 5%;
    display: flex;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

.hero-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
    border: 1px solid var(--border-color);
}

/* Content Layout (2 Columns) */
.content-wrapper {
    max-width: 1200px;
    margin: 50px auto;
    padding: 0 5%;
}

.seo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: linear-gradient(145deg, #160202, #0d0000);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.9);
}

/* Footer */
footer {
    background-color: var(--secondary-dark);
    border-top: 2px solid var(--accent-red);
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* SEO Footer Links (Safe Hidden Technique) */
.seo-footer-links {
    margin-top: 15px;
    font-size: 11px;
    color: #444444;
    /* Abu-abu gelap agar menyatu dengan latar belakang gelap */
    opacity: 0.3;
    transition: all 0.4s ease;
}

.seo-footer-links:hover {
    opacity: 1;
    color: var(--text-muted);
}

.seo-footer-links a {
    color: inherit;
    text-decoration: none;
    padding: 0 5px;
}

/* FAQ Section */
.faq-section {
    background: linear-gradient(145deg, #160202, #0d0000);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.9);
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 30px;
}

.faq-container details {
    background-color: var(--primary-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    padding: 15px 20px;
    cursor: pointer;
}

.faq-container summary {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    color: var(--text-light);
    list-style: none;
    /* Menghilangkan panah default */
    outline: none;
}

.faq-container summary::-webkit-details-marker {
    display: none;
}

.faq-container p {
    margin-top: 15px;
    margin-bottom: 0;
}

/* Scroll to Top Button */
.scroll-top-btn {
    display: none;
    /* Disembunyikan secara default oleh JS */
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1001;
    font-size: 24px;
    border: none;
    background-color: var(--accent-red);
    color: #fff;
    cursor: pointer;
    padding: 10px 15px;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.scroll-top-btn:hover {
    background-color: var(--accent-red-hover);
    transform: scale(1.1);
}

/* Fade-in Animation */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 900px) {
    .seo-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    header {
        flex-direction: column;
        gap: 15px;
    }

    .nav-buttons {
        width: 100%;
        justify-content: center;
    }

    .btn {
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .seo-content {
        padding: 20px;
    }

    .scroll-top-btn {
        bottom: 20px;
        right: 20px;
    }
}